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用Visual C++实现屏幕抓图程序

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 在Windows操作系统中,当用户按下"PrintScreen"按钮后,Windows自动将当前屏幕的图像拷贝到系统剪贴板中,这时可以通过"画笔"这个小程序将剪贴板中的内容保存成图像文件,可以看出,如果需要将当前屏幕保存下来还是比较麻烦的,能否可以自己编写一个应用程序,自动将当前屏幕的内容保存到一个图像文件中去呢?这个答案是肯定的,本实例应用程序就是利用通用的热键管理DLL库实现的热键功能,在收到热键通知后截取屏幕的内容并保存到bmp文件中。例如我们设置图片保存路径为c:\,热键为F9 + Control,然后按Change按钮设置好热键,那么当我们按下CTRL+F9后,当前界面将以BMP图像文件的格式被保存在C:\目录下。程序编译运行后的界面效果如图一所示: vFb{(gIJ  
  P; }Z 3!  
  一、实现方法 ~B(]0:  
j %TYyL-  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: bS/`G0!  
R)cns7oW  
#pragma data_seg("shareddata") { r&M  
HHOOK hHook =NULL; //钩子句柄 DHt 8 f  
UINT nHookCount =0; //挂接的程序数目 NG'VlT  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 /F;*[JZIb  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 .ET;wK  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey no?)GQ  
static int KeyCount =0; `N(.10~  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 P+}qaup  
#pragma data_seg() ~n[LL)v  
]Jnf. 3  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 A ws#>l<  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: F5 LQgK-z  
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BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR tEN]0`  
cKey,UCHAR cMask) mApn(&  
{ x(]s#D!)  
 BOOL bAdded=FALSE; ~;eWQwD  
 for(int index=0;index<MAX_KEY;index++){ dt`L}Yi  
  if(hCallWnd[index]==0){ k 5"3*  
   hCallWnd[index]=hWnd; TdKl`"Iy  
   HotKey[index]=cKey; tB_V%qH  
   HotKeyMask[index]=cMask; @0 -B&w  
   bAdded=TRUE; C9=f=sGL  
   KeyCount++; o B6" D  
   break; &V=54n=O?  
  } G4x.''r&Sl  
 } Z;>~<#!4  
 return bAdded; =rBFMTllM  
} IN%>46e`  
//删除热键 }2NH>qvY  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) =fsaJ@q ,R  
{ d:pp,N~2o  
 BOOL bRemoved=FALSE; h.?[1hT4R  
 for(int index=0;index<MAX_KEY;index++){ "L8V!M_e  
  if(hCallWnd[index]==hWnd){ awkVjyqX  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ izC>-  
    hCallWnd[index]=NULL; LpmspIPvf  
    HotKey[index]=0; 9d{W/t?NH  
    HotKeyMask[index]=0; =k$d8g ez  
    bRemoved=TRUE; mr('zpkRq  
    KeyCount--; pRU6jV 6e)  
    break; 8W$="s2  
   } Q ,;x;QR4  
  } N\uQ-XOi  
 } Ec\x;li! *  
 return bRemoved; rqF PUp  
} \s+MHa&  
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b]JN23IS2  
  DLL中的钩子函数如下: hf?^#=k^  
;! 9_5Ar%  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) !8L Ql}  
{ L}21[ N~ky  
 BOOL bProcessed=FALSE; &R5M&IwL  
 if(HC_ACTION==nCode) M:I,j  
 { <oXsn.'\  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 i3%~Gc63  
   switch(wParam) ~qqtFjlG^  
   {  q~w;C([k_  
    case VK_MENU: pbzbh&Y  
     MaskBits&=~ALTBIT; 'I<j`)4`d  
     break; L3GJq{t  
    case VK_CONTROL: 'D/AL\1{p(  
     MaskBits&=~CTRLBIT; +.N;h-'  
     break; ; zvnDox  
    case VK_SHIFT: /y!Vs`PZ!  
     MaskBits&=~SHIFTBIT; ,Tz ,)rY  
     break; A0]o/IBz  
    default: //judge the key and send message qXhrK /  
     break; OK)0no=OAK  
   } X,fTzkGj  
   for(int index=0;index<MAX_KEY;index++){ p|FX_4RjX  
    if(hCallWnd[index]==NULL) O#EBR<CuK  
     continue; ZGbZu  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) %om7h$D =`  
    { E1C8yIF  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); >WDpBn:  
     bProcessed=TRUE; gK<-*v  
    } h4qR\LX  
   } gU~)(|Nu.  
  } up1aFzY|6x  
  else if((lParam&0xc000ffff)==1){ //有键按下 # _7c>gn  
   switch(wParam) %nCUct@c  
   { ?hmb"^vlG  
    case VK_MENU: 62 _$O"  
     MaskBits|=ALTBIT; 1(?J>{-lw  
     break; 9Ac t<( V  
    case VK_CONTROL: -24.[E/5  
     MaskBits|=CTRLBIT; &q< 8tTW5  
     break; t<k8.9 M$  
    case VK_SHIFT: |{ [i M  
     MaskBits|=SHIFTBIT; BdKtpje  
     break; FO5SXwx  
    default: //judge the key and send message 5`uS<[vA  
     break; i3"sAr P"|  
   } "_K 6=  
   for(int index=0;index<MAX_KEY;index++){ /iN\)y#u1  
    if(hCallWnd[index]==NULL) h|H;ZC(B  
     continue; GMNb;D(>K  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) E\zhxiI  
    { b910Z?B^L  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); bpx=&74,6m  
     bProcessed=TRUE; KCT8Q!\  
    } G;m"ao"2  
   } ul%bo%&~  
  } \nHlI=!P  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 :A'!u r=\  
   for(int index=0;index<MAX_KEY;index++){ <S}qcjG  
    if(hCallWnd[index]==NULL) kW~F*  
     continue; ?c2TT Q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) B1M/5cr.  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); FSmi.7  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ]]Z,Qu#<-  
   } aOHCr>po,  
  } ,$]q2aL  
 } N93E;B  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); #TgJ d  
} p~.@8r(  
<e^/hR4O  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: DPwSg\*)  
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BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 'O`3FI  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 7&3URglsL"  
nX~MoWH1  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: -!0LIr:"  
vxeT[/6i  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) `Ek!;u>  
{ r$F]e]Ic\  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) .vv*bx   
 { 8j'*IRj*q  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 752wK|o0|;  
  SaveBmp(); vdm?d/0(^  
  return FALSE; wB)+og-^1f  
 } is(!_Iv  
 …… //其它处理及默认处理 95Qz1*TR  
} p4'"Wk8  
$<cZ<g5)  
Fsf22  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 ;*2e;m~)?  
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  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 L0kNt &di  
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  二、编程步骤 0 MIMs#  
gDub+^ye>/  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; Hl;p>>n  
BFO Fes`>~  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Oez}C,0  
.m?~TOR  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; .( h$@|Y  
{^W,e ^:  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; \.c )^QQ  
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  5、 添加代码,编译运行程序。 V]]qu:Mh8  
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三、程序代码 @vYmkF`  
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///////////////////////////////////// Hook.h : main header file for the HOOK DLL O->eg  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) fmJWd|  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ QYgN39gp  
#if _MSC_VER > 1000 mi<D bnou  
#pragma once \+3Wd$I  
#endif // _MSC_VER > 1000 -o_T C  
#ifndef __AFXWIN_H__ tb0E?&M  
#error include 'stdafx.h' before including this file for PCH CFm1c1%Hg  
#endif HY4E  
#include "resource.h" // main symbols F2$bUY  
class CHookApp : public CWinApp  <%D"eD  
{ X`n0b<  
 public: b 0b9#9x  
  CHookApp(); s[q4K  
  // Overrides f_!`~`04  
  // ClassWizard generated virtual function overrides L~{Vt~H9"  
  //{{AFX_VIRTUAL(CHookApp) Qe$>Jv5  
 public: !>< %\K  
  virtual BOOL InitInstance(); r ` &|)Hx  
  virtual int ExitInstance(); yim$y, =d  
  //}}AFX_VIRTUAL /:` i%E  
  //{{AFX_MSG(CHookApp) pPqN[OJ  
  // NOTE - the ClassWizard will add and remove member functions here. 0l: pWc  
  // DO NOT EDIT what you see in these blocks of generated code ! ph?0I: eU  
  //}}AFX_MSG <cv1$ x ~P  
  DECLARE_MESSAGE_MAP() 3DAGW"F  
}; 6KCmswvE  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); `Kw"XGT  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 4E-A@FR  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); p@Y$eZ:O  
BOOL InitHotkey(); &}0wzcMg  
BOOL UnInit(); TucAs 0-bF  
#endif Ig3(|{R  
;3|Lw<D5;  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. G'2=jHzMF  
#include "stdafx.h" fG2&/42J  
#include "hook.h" =O#AOw`  
#include <windowsx.h> rz }l<t~H  
#ifdef _DEBUG 0BB @E(*  
#define new DEBUG_NEW rm=~^eB  
#undef THIS_FILE :{s%=\k {d  
static char THIS_FILE[] = __FILE__; {!1n5a3" 1  
#endif g!p_c  
#define MAX_KEY 100 G;HlII9x[  
#define CTRLBIT 0x04 2c~?UK[1  
#define ALTBIT 0x02 ^i+ z_%V  
#define SHIFTBIT 0x01 zI&4k..4  
#pragma data_seg("shareddata") Z4AAg  
HHOOK hHook =NULL; F|Dz]ar  
UINT nHookCount =0; ]jVSsSv  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey bp>ps@zFq  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT zrU$SWU  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey tOM3Gs~o6z  
static int KeyCount =0; QHzX 5$IM  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift xbrmPGpW$  
#pragma data_seg() >3`ctbe  
HINSTANCE hins; nqxq@.L2  
void VerifyWindow(); N9=r#![>,  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 2v9s@k/k)6  
//{{AFX_MSG_MAP(CHookApp) U aj`  
// NOTE - the ClassWizard will add and remove mapping macros here. 2]NAs9aZ  
// DO NOT EDIT what you see in these blocks of generated code! gLaO#cQ%  
//}}AFX_MSG_MAP =3sldKL&F  
END_MESSAGE_MAP() ,AbKxT f2  
:@>br+S  
CHookApp::CHookApp() D d# SUQ  
{ JXY!c\,  
 // TODO: add construction code here, `H2F0{\og  
 // Place all significant initialization in InitInstance CoUd16*"JM  
} @CaD8%j{  
OgXZ-<'  
CHookApp theApp; oA;jy  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) H@2v<e@  
{ V1`5D7Z  
 BOOL bProcessed=FALSE; # HM\ a  
 if(HC_ACTION==nCode) I4<{R  
 { /s8%02S  
  if((lParam&0xc0000000)==0xc0000000){// Key up +/3 Z  
   switch(wParam) e}R2J `7  
   { 9O=05CQ  
    case VK_MENU: o ?va#/fk  
     MaskBits&=~ALTBIT; CS;W)F  
     break; K_&c5(-(_  
    case VK_CONTROL: ]\a\6&R  
     MaskBits&=~CTRLBIT; \buZ?  
     break; <Sprp]n 7  
    case VK_SHIFT: zK>'tFU  
     MaskBits&=~SHIFTBIT; \Qi#'c$5+a  
     break; fa4951_  
    default: //judge the key and send message => uVp  
     break; ~t${=o430  
   } }r~v,KDb  
   for(int index=0;index<MAX_KEY;index++){ ll(e,9.D  
    if(hCallWnd[index]==NULL)  mF*?e/  
     continue; A)RI:?+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6t_ 3%{  
    { DYAwQ"i;6  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Pv7f _hw  
     bProcessed=TRUE; -y l4tW  
    } b 5F4+  
   } 5xMA~I0c  
  } V<HOSB7  
  else if((lParam&0xc000ffff)==1){ //Key down AU\xNF3  
   switch(wParam) t*Vao  
   { j$|j8?  
    case VK_MENU: qP;{3FSkAF  
     MaskBits|=ALTBIT; o0aO0Y  
     break; *X=@yB*aK  
    case VK_CONTROL: L,L ~ .E  
     MaskBits|=CTRLBIT; r;cI}'  
     break; m6_~`)R8  
    case VK_SHIFT: #}/cM2m  
     MaskBits|=SHIFTBIT; *h*j%  
     break; C,|nmlDN  
    default: //judge the key and send message yhSk"e'G  
     break; -[zdX}x.:  
   } c YM CfP  
   for(int index=0;index<MAX_KEY;index++) 5U-p'c9IC  
   { >J^7}J  
    if(hCallWnd[index]==NULL) QH7V_#6bKP  
     continue; Jb3>vCIn  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))  ko=aa5c  
    { vz;7} Zj]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); A*\o c  
     bProcessed=TRUE; tA! M  
    } 79{.O`v  
   } MPKpS3VS  
  } ~j/bCMEf!  
  if(!bProcessed){ 0a2$P+p  
   for(int index=0;index<MAX_KEY;index++){ &TP:yA[  
    if(hCallWnd[index]==NULL) ch0oFc$  
     continue; :(bdI]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ~t{D5#LVHa  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 9{)Z5%Kz  
   }  3}>:  
  } L _vblUDq  
 } Q^a&qYK  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); pBSq%Hy:  
} BKE\SWu  
~rgf{oGz  
BOOL InitHotkey() WZ^{zFoZ  
{ Y|%anTP  
 if(hHook!=NULL){ $i,6B9  
  nHookCount++; DO7- =74=  
  return TRUE; /*u#Ba<<  
 } J6)efX)j-p  
 else C6K|:IK{  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); b4Ricm  
  if(hHook!=NULL) z>cIiprX  
   nHookCount++; F^.om2V|9  
  return (hHook!=NULL); ki;!WhF~  
} B;xZ% M]  
BOOL UnInit() iEiu%T>  
{ W<\kf4Y  
 if(nHookCount>1){ r+t ,J|V  
  nHookCount--; |rr$U  
  return TRUE; snXB`U C  
 } 5z1\#" B[  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ~A8qeaP  
 if(unhooked==TRUE){ D ?Nd; [  
  nHookCount=0; - *:p.(c  
  hHook=NULL; 5~@?>)TBv  
 } %/UV_@x&  
 return unhooked; [3t0M5x w  
} Dh hG$  
'8s>rH5[V  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) +mJ :PAy4  
{ 69t7=r  
 BOOL bAdded=FALSE; F;IP3tD  
 for(int index=0;index<MAX_KEY;index++){ siZr@g!L  
  if(hCallWnd[index]==0){ KKLR'w,A>  
   hCallWnd[index]=hWnd; ]YCPyc:  
   HotKey[index]=cKey; W*YxBn4  
   HotKeyMask[index]=cMask; lemVP'cn  
   bAdded=TRUE; p Tcbq  
   KeyCount++; *-?Wcz  
   break; 6yE'/VB<  
  } ;$vLq&(}  
 } }czsa_  
 return bAdded; L/Hv4={  
} "/Y<G  
9.xvV|Sp  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Z8&4z.6_  
{ WHp97S'd  
 BOOL bRemoved=FALSE; TNh=4xQ}  
 for(int index=0;index<MAX_KEY;index++){ x|.v{tQa  
  if(hCallWnd[index]==hWnd){ ETM2p1 ru0  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ K@q&HV"'.  
    hCallWnd[index]=NULL; qOW#Q:T  
    HotKey[index]=0; t:\l&R&  
    HotKeyMask[index]=0; ~V @;(_T  
    bRemoved=TRUE; GHv{   
    KeyCount--; Vd,'  s  
    break; 7e1dEgn  
   } z<a$q3!#  
  } T |37#*c  
 } (jMtN?&0H-  
 return bRemoved; -M6L.gi)oJ  
} tC^ 1}  
'9'l=Sh  
void VerifyWindow() gXLCRn!iR  
{ @zo7.'7P   
 for(int i=0;i<MAX_KEY;i++){ G;/Q>V  
  if(hCallWnd!=NULL){ ovo/!YJ2  
   if(!IsWindow(hCallWnd)){ CK2B  
    hCallWnd=NULL; y>$1 UwQ  
    HotKey=0; XcOA)'Py  
    HotKeyMask=0; +fM&su=wl  
    KeyCount--; S"zk!2@C  
   } $ K})Q3FNi  
  } d]8_l1O  
 } Q8;#_HE  
} (/&;jV2DD[  
Hk@r5<{  
BOOL CHookApp::InitInstance() 4:D:| r  
{ {|z#70  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); $`pd|K`  
 hins=AfxGetInstanceHandle(); {J2#eiF  
 InitHotkey(); Zb."*zL  
 return CWinApp::InitInstance(); U 2bzUxK  
} $ADPV,*gG  
'f*O#&?  
int CHookApp::ExitInstance() !n eo\  
{ s _~IZ%+<.  
 VerifyWindow(); I FsE!oDs4  
 UnInit();  r@k"4ce-  
 return CWinApp::ExitInstance(); H8&p<=  
} A;,Dg=FL/  
L?8^aG  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file j9:/RJS  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) oE1M/*myS  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ {SJsA)9:#  
#if _MSC_VER > 1000 )B;M  
#pragma once +oZH?N4yaM  
#endif // _MSC_VER > 1000 b0 &  
+Qs!Nhsq  
class CCaptureDlg : public CDialog LKx`v90p  
{ fJy)STQ4  
 // Construction )7dEi+v52  
 public: xdZ<| vMR  
  BOOL bTray; mZ7B<F[qV  
  BOOL bRegistered; r2nBWA3  
  BOOL RegisterHotkey(); 9 6=Z"  
  UCHAR cKey; o&z!6"S<  
  UCHAR cMask; 3 CM^j<9  
  void DeleteIcon(); %G[/H.7s-  
  void AddIcon(); 1[SA15h  
  UINT nCount; &cc9}V)M  
  void SaveBmp(); mw4JQ\  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor -w]/7cH  
  // Dialog Data P$ucL~r  
  //{{AFX_DATA(CCaptureDlg) O#EqG.L5  
  enum { IDD = IDD_CAPTURE_DIALOG }; :H?f*aw  
  CComboBox m_Key; q jz3<`7-  
  BOOL m_bControl; hbI;Hd  
  BOOL m_bAlt; (rcMA>2=  
  BOOL m_bShift; 2 z7}+lH  
  CString m_Path; qfYG.~`5  
  CString m_Number; w{`Acu  
  //}}AFX_DATA PNpu*# Z`  
  // ClassWizard generated virtual function overrides I8u!\F  
  //{{AFX_VIRTUAL(CCaptureDlg) 59 <hV?  
 public: d2~l4IL)~  
  virtual BOOL PreTranslateMessage(MSG* pMsg); _R^y\1Qu  
 protected: ARF\fF|<2  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 1k[GuG%/K  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 6{=_718l`  
  //}}AFX_VIRTUAL >b48>@~bY  
  // Implementation SE)nD@:  
 protected: 514Z<omrK  
  HICON m_hIcon; ;iU%Kt  
  // Generated message map functions 6+3$:?  
  //{{AFX_MSG(CCaptureDlg) ^m%52Tm h  
  virtual BOOL OnInitDialog(); w"8V0z  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ~}Z'0W)Q`z  
  afx_msg void OnPaint(); %(<(Y  
  afx_msg HCURSOR OnQueryDragIcon(); aGK@)&h$  
  virtual void OnCancel(); \uM? S  
  afx_msg void OnAbout(); fu R2S70d  
  afx_msg void OnBrowse(); I]R9HGJNlJ  
  afx_msg void OnChange(); }pawIf4V  
 //}}AFX_MSG T SjI z5  
 DECLARE_MESSAGE_MAP() g jxS  
}; qTM%G-  
#endif X>zlb$  
/t5p-  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ]Blf9h7  
#include "stdafx.h" dJD(\a>r.u  
#include "Capture.h" OlY$ v@|  
#include "CaptureDlg.h" CU$#0f>  
#include <windowsx.h> bd== +   
#pragma comment(lib,"hook.lib") >c~RI7uu  
#ifdef _DEBUG S6sq#kcH  
#define new DEBUG_NEW opp!0:jS*  
#undef THIS_FILE O/b+CSS1  
static char THIS_FILE[] = __FILE__; C:i|-te  
#endif @i LIU}+  
#define IDM_SHELL WM_USER+1 cyQBqG  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); H}ZQ?uK;  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); |V|+lx'sc  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; %3o`j<  
class CAboutDlg : public CDialog =&vFVIhWcf  
{ q \O Ou  
 public: cb$-6ZE/  
  CAboutDlg(); I ~$1Lu`~  
  // Dialog Data 8-M e.2K  
  //{{AFX_DATA(CAboutDlg) I=Ij dwbH  
  enum { IDD = IDD_ABOUTBOX }; *Y6xvib9*  
  //}}AFX_DATA I7(?;MpI  
  // ClassWizard generated virtual function overrides nidr\oFUIn  
  //{{AFX_VIRTUAL(CAboutDlg) 0* F}o)n/m  
 protected: (= ;N{u  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support R_N:#K.M  
  //}}AFX_VIRTUAL Y; ) .+si  
  // Implementation }6]0hWsN[  
 protected: `u XQ z7  
  //{{AFX_MSG(CAboutDlg) X2yTlLdY  
  //}}AFX_MSG FvdeQsc!  
  DECLARE_MESSAGE_MAP() {5j66QFoo  
}; fex,z%}p  
<1"+,}'x  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) )L5i&UK.  
{ X.FGBR7=q  
 //{{AFX_DATA_INIT(CAboutDlg) w>e s  
 //}}AFX_DATA_INIT igC_)C^i>  
} c#cx>wq9  
EWj gI_-  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) "%6/a7S  
{ V/%~F6e  
 CDialog::DoDataExchange(pDX); V diJ>d[  
 //{{AFX_DATA_MAP(CAboutDlg) =,V|OfW  
 //}}AFX_DATA_MAP v=?2S  
} s?C&s|'.  
OW@\./nM  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) e0HfP v_  
 //{{AFX_MSG_MAP(CAboutDlg) F0lOlS   
 // No message handlers HM9fjl[  
 //}}AFX_MSG_MAP ej(ikj~j  
END_MESSAGE_MAP() <AoXEu D  
@n+=vC.xO  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ?cy4&]s  
: CDialog(CCaptureDlg::IDD, pParent) @It>*B yB.  
{ & E}mX]t  
 //{{AFX_DATA_INIT(CCaptureDlg) z=Cr7-  
  m_bControl = FALSE; mUoIJ3fv_,  
  m_bAlt = FALSE; .u z|/Zy  
  m_bShift = FALSE; vbG]mMJ  
  m_Path = _T("c:\\"); |j~lkzPnV  
  m_Number = _T("0 picture captured."); ~bK9R 0|<  
  nCount=0; p&b5% 4P  
  bRegistered=FALSE; PnYBy| yl  
  bTray=FALSE; </`yd2>  
 //}}AFX_DATA_INIT 7'lZg<z{~j  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 2kh"8oQ  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); m#7*:i&@Y  
} b #fTAC;<  
Ea $aUORm  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) (eWPis[  
{ 23]Y<->Eu<  
 CDialog::DoDataExchange(pDX); OF U/gaO~  
 //{{AFX_DATA_MAP(CCaptureDlg) Rl~T$ Ey  
  DDX_Control(pDX, IDC_KEY, m_Key); 60>.ul2  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Vu8,(A7D%O  
  DDX_Check(pDX, IDC_ALT, m_bAlt); !wz/c M;  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ]d}0l6  
  DDX_Text(pDX, IDC_PATH, m_Path); 9pKGr@&   
  DDX_Text(pDX, IDC_NUMBER, m_Number); jeUUa-zR3  
 //}}AFX_DATA_MAP Wr?'$:  
} b;cMl'  
E%N2k|%8d_  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) zZ-\a[F  
//{{AFX_MSG_MAP(CCaptureDlg) o4y']JSN  
 ON_WM_SYSCOMMAND() ~FU@wV^   
 ON_WM_PAINT() d^E [|w ;  
 ON_WM_QUERYDRAGICON() j]rz] k  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) uBrMk  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) DGESba\2+  
 ON_BN_CLICKED(ID_CHANGE, OnChange)  ;q>9W,jy  
//}}AFX_MSG_MAP V^s0fWa  
END_MESSAGE_MAP() gb|Q%LS9R  
=n(3o$r(  
BOOL CCaptureDlg::OnInitDialog() WYcA8 X/  
{ 5VW|fI  
 CDialog::OnInitDialog(); q8P.,%   
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); iA }vKQ  
 ASSERT(IDM_ABOUTBOX < 0xF000); 5s{j = .O  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ;]2s,za)qs  
 if (pSysMenu != NULL) SkQswH  
 { EbNd=Z'J  
  CString strAboutMenu; pc]J[ S?P  
  strAboutMenu.LoadString(IDS_ABOUTBOX);  XRN+`J  
  if (!strAboutMenu.IsEmpty()) iUk-'   
  { _i0kc,*C\  
   pSysMenu->AppendMenu(MF_SEPARATOR); X;F8_+Np  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); @@G6p($  
  } Q n)d2-<  
 } $tqJ/:I  
 SetIcon(m_hIcon, TRUE); // Set big icon T#@lDpO  
 SetIcon(m_hIcon, FALSE); // Set small icon K$ }a8rH  
 m_Key.SetCurSel(0); dq;|?ESP  
 RegisterHotkey(); xgu `Q`~  
 CMenu* pMenu=GetSystemMenu(FALSE); cf_|nL#9  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); x3+oAb@o/  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); d~J-|yyT  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Hy:V`>  
 return TRUE; // return TRUE unless you set the focus to a control YIhm$A"z0"  
} {V19Zv"j  
#SVNHpx  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) CG\tQbum  
{ CK+d!Eg  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) K kW;-{c  
 { -7H^n#]  
  CAboutDlg dlgAbout; EI>l-N2  
  dlgAbout.DoModal(); f_^1J  
 } m0w;8uF2UV  
 else  D1 Z{W  
 { URgk^nt2p  
  CDialog::OnSysCommand(nID, lParam); e!-,PU9+  
 } 6Q&r0>^{  
} WS8+7O'1\  
r;>+)**@vl  
void CCaptureDlg::OnPaint() X r63?N  
{ BAj-akc f  
 if (IsIconic()) k,F"-K+M  
 { `A$!]&[~|  
  CPaintDC dc(this); // device context for painting 6DTTV66  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); %q ;jVj[  
  // Center icon in client rectangle d$ACDX2  
  int cxIcon = GetSystemMetrics(SM_CXICON); g1E~+@  
  int cyIcon = GetSystemMetrics(SM_CYICON); A5:qKaAq  
  CRect rect; 1F8 W9b^D  
  GetClientRect(&rect); f"u *D,/sS  
  int x = (rect.Width() - cxIcon + 1) / 2; <:>SGSE9  
  int y = (rect.Height() - cyIcon + 1) / 2; &GTI  
  // Draw the icon 3f Xv4R;!:  
  dc.DrawIcon(x, y, m_hIcon); Am0{8 '  
 } Qhi '') Q  
 else Y/<lWbj*A  
 { '+>fFM,*B  
  CDialog::OnPaint(); F7L&=K$2y  
 } 7M_U2cd|TD  
} gbeghLP[?  
/I5X"x  
HCURSOR CCaptureDlg::OnQueryDragIcon() :AdDLpk3j  
{ -~[9U,  
 return (HCURSOR) m_hIcon; /^{BUo  
} Jf)bHjC_V  
JCcZuwu[  
void CCaptureDlg::OnCancel()  9fnA  
{ YYEJph@06q  
 if(bTray) 5Z/GK2[HL  
  DeleteIcon(); hRI"y":zD  
  CDialog::OnCancel(); >7`<!YJkK  
} =o}"jVE  
nMfFH[I4  
void CCaptureDlg::OnAbout() &;,,H< p  
{ 1(Y7mM8\  
 CAboutDlg dlg; 3nZ9m  
 dlg.DoModal(); 4(neKr5\#  
} =p^He!  
jr7C}B-Fb^  
void CCaptureDlg::OnBrowse() .roqEasu8  
{ .#u_#=g?  
 CString str; )Au6Nf  
 BROWSEINFO bi; "vCM}F  
 char name[MAX_PATH]; s5.AW8X=?*  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 5erc D  
 bi.hwndOwner=GetSafeHwnd(); !MDNE*_  
 bi.pszDisplayName=name; do-ahl,  
 bi.lpszTitle="Select folder"; UX3BeUi.)  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ;@,Q&B2eM  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 07Gv*.  
 if(idl==NULL) w;}@'GgL  
  return; `~eX55W  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); b `2|I {  
 str.ReleaseBuffer(); I$NhXZ)KT  
 m_Path=str; EV#MQM  
 if(str.GetAt(str.GetLength()-1)!='\\') tt?58dm|  
  m_Path+="\\"; -7/s]9o'  
 UpdateData(FALSE); YCe7<3>J4  
} & gJV{V5Ay  
""Zp:8o  
void CCaptureDlg::SaveBmp() ^J Z^>E~  
{ \ \BCcr\l  
 CDC dc; ~U(,TjJb  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Qu=LnGo~P  
 CBitmap bm;  nVu&/  
 int Width=GetSystemMetrics(SM_CXSCREEN); o-xDh7v  
 int Height=GetSystemMetrics(SM_CYSCREEN); di)*-+  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 9!9Z~ /*m  
 CDC tdc; W3vi@kb]  
 tdc.CreateCompatibleDC(&dc); !3i Gz_y  
 CBitmap*pOld=tdc.SelectObject(&bm); mNf8kwr  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); pME{jD  
 tdc.SelectObject(pOld); ZKQ hbNT  
 BITMAP btm; bWl5(S` Z  
 bm.GetBitmap(&btm); 4L-:*b_v\  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; L- pVltX  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); xvzr:p P  
 BITMAPINFOHEADER bih; -yGDh+-  
 bih.biBitCount=btm.bmBitsPixel; {GvTfZfp  
 bih.biClrImportant=0; V._6=ZJ  
 bih.biClrUsed=0; "G-1>:   
 bih.biCompression=0; aK,z}l(N  
 bih.biHeight=btm.bmHeight; gH2,\z`[4  
 bih.biPlanes=1; B63pgPX  
 bih.biSize=sizeof(BITMAPINFOHEADER); AC O)Dt(Y  
 bih.biSizeImage=size; GV)<Q^9  
 bih.biWidth=btm.bmWidth; A^ _a3$,0  
 bih.biXPelsPerMeter=0; OA:%lC!  
 bih.biYPelsPerMeter=0; "dR |[a<#g  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); KZ!3j_pKy  
 static int filecount=0; "'g[1Li  
 CString name; J};z85B  
 name.Format("pict%04d.bmp",filecount++); +(xeT+J  
 name=m_Path+name; vA$o~?a]/  
 BITMAPFILEHEADER bfh; ]M)O YY  
 bfh.bfReserved1=bfh.bfReserved2=0; 1 )}=bhT  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ^8 ' sib  
 bfh.bfSize=54+size; J--m[X  
 bfh.bfOffBits=54; T081G`li  
 CFile bf; MYBx&]!\  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ yCJFo  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); r]W  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 7nbB^2  
  bf.WriteHuge(lpData,size); _#$ *y  
  bf.Close(); > 0{S  
  nCount++; U yw-2]!n  
 } s5RjIa0$7  
 GlobalFreePtr(lpData); pLMRwgzr  
 if(nCount==1) KXV[OF&J  
  m_Number.Format("%d picture captured.",nCount); AtR?J"3E  
 else <I}2k  
  m_Number.Format("%d pictures captured.",nCount); t}v2$<!I  
  UpdateData(FALSE); i"|$(2  
} bs9aE< j  
X7,PEA  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) T&86A\D\z  
{ "x@='>:$  
 if(pMsg -> message == WM_KEYDOWN) p8s:g~ W  
 { "<}&GcJbz  
  if(pMsg -> wParam == VK_ESCAPE) J5h+s-'  
   return TRUE; +A~\tK{  
  if(pMsg -> wParam == VK_RETURN) e4~>G?rM_  
   return TRUE; "Jjs"7  
 } F}"]92  
 return CDialog::PreTranslateMessage(pMsg); LqdY Qd51  
} j)t+jcMUI  
&z"krM]G  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) j CTAKaq  
{ +0),xu  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ;['[?wk  
  SaveBmp(); d:G]1k;z  
  return FALSE; I@Xn3oN  
} O]f/r,4@  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ .^$YfTabq  
 CMenu pop; JQ :Ri  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); E;21?`x5  
 CMenu*pMenu=pop.GetSubMenu(0); #,{+3Y&5-+  
 pMenu->SetDefaultItem(ID_EXITICON); ^m_yf|D$  
 CPoint pt; Hi_ G  
 GetCursorPos(&pt); bCZ g cN  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); $A3<G-4O  
 if(id==ID_EXITICON) yL;M"L  
  DeleteIcon(); h7s; m  
 else if(id==ID_EXIT) &C>/L;  
  OnCancel(); y*{Zbz#{  
 return FALSE; Rl|4S[  
} [i0Hm)Bd3  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); k%y9aO  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) T0)"1D<l  
 AddIcon(); _Lw OOZj  
 return res; Q-#$Aa  
} l{w#H|]  
smG>sEp2  
void CCaptureDlg::AddIcon() _2btfY1U  
{ LQnkcV  
 NOTIFYICONDATA data; 4@.|_zY  
 data.cbSize=sizeof(NOTIFYICONDATA); %3HVFhl  
 CString tip; iTW? W\d  
 tip.LoadString(IDS_ICONTIP); Bx[rC  
 data.hIcon=GetIcon(0); %AOIKK5  
 data.hWnd=GetSafeHwnd(); 8G>>i)Sbg  
 strcpy(data.szTip,tip); vpPl$ga5bY  
 data.uCallbackMessage=IDM_SHELL; 7u\*_mrv  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; x\2?ym@  
 data.uID=98; KRJLxNr  
 Shell_NotifyIcon(NIM_ADD,&data); [OOS`N4<  
 ShowWindow(SW_HIDE); \:> Wpqw  
 bTray=TRUE; =66Nw(E.  
} E&Qi@Ty  
pj?XLiM54%  
void CCaptureDlg::DeleteIcon() 0?WcoPU  
{ +h2eqNr  
 NOTIFYICONDATA data; -/ ]W+[  
 data.cbSize=sizeof(NOTIFYICONDATA); t>B^q3\q?  
 data.hWnd=GetSafeHwnd(); rQTr8DYH  
 data.uID=98; /yLZ/<WN  
 Shell_NotifyIcon(NIM_DELETE,&data); 6 \B0^  
 ShowWindow(SW_SHOW); @DW[Z`X  
 SetForegroundWindow(); k%[3Q>5iM  
 ShowWindow(SW_SHOWNORMAL); xUF_1hY  
 bTray=FALSE; RvJ['(-  
} N8KQz_]9I  
@`FCiHM  
void CCaptureDlg::OnChange() fAZiC+  
{ sBv>E}*R  
 RegisterHotkey(); Khh0*S8.K  
} m~Ld~I"  
Z%Z9oJ:  
BOOL CCaptureDlg::RegisterHotkey() Gamr6I"K  
{ M.h`&8  
 UpdateData(); 6)pH |d.FR  
 UCHAR mask=0; w@2Vts  
 UCHAR key=0; reo{*) %  
 if(m_bControl) (I@bkMp  
  mask|=4; E^w:KC2@  
 if(m_bAlt) y80ykGPT\&  
  mask|=2; y{q*s8NY  
 if(m_bShift) zU6a't P  
  mask|=1; j QU"Ved  
  key=Key_Table[m_Key.GetCurSel()]; K!D o8|  
 if(bRegistered){ yV)m"j  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); K; FW  
  bRegistered=FALSE; _wb0'xoK"  
 } 93[DAs  
 cMask=mask; RkF D*E$  
 cKey=key; u6:pV.p  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); =O|c-k,f@  
 return bRegistered; j?b\+rr  
} pIW I  
qDWsvx]  
  四、小结 HG/p$L*  
=TR,~8Z|  
  本实例通过一个钩子DLL实现了屏幕抓图的功能,它有一个缺陷,那就是只能保存整个屏幕图像,不过读者朋友可以在此基础上,实现屏幕任意区域的抓图功能,具体方法不再赘述,实现起来很容易的了,呵呵。
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