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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: TwZvz[u  
  YLlw:jN  
  一、实现方法 Cf_Ik  
35Jno<TP'  
  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: o(W|BD!  
RRD\V3C84  
#pragma data_seg("shareddata") u+]v. Mt  
HHOOK hHook =NULL; //钩子句柄 n7vLw7  
UINT nHookCount =0; //挂接的程序数目 F:/R'0  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 J3sO%4sYR  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 TsPO+x$l  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey -5NP@  
static int KeyCount =0; -=E/_c;  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 tUmI#.v   
#pragma data_seg() ~Exd_c9  
E<3hy  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 N0c+V["s  
VI%879Z\e  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: h2 Ifq!(:  
JF*JF Ob  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR laM0W5  
cKey,UCHAR cMask) 's$pr#V  
{ gKg2Ntxj  
 BOOL bAdded=FALSE; k@5,6s:  
 for(int index=0;index<MAX_KEY;index++){ xZ@H{):  
  if(hCallWnd[index]==0){ Y*``C):K%  
   hCallWnd[index]=hWnd; V/+r"le  
   HotKey[index]=cKey; p5C sw5  
   HotKeyMask[index]=cMask; )2oWoZ vi9  
   bAdded=TRUE; a#1LGH7E8  
   KeyCount++; =&,zWNz)  
   break; gQ h0-Dnw  
  } \%NhggS*  
 } >b-rAO\{}  
 return bAdded; .i/]1X*;r^  
} 2 c'=^0:  
//删除热键 *&e+z-E  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !23W=N}82  
{ >"F~%D<.  
 BOOL bRemoved=FALSE; Ul[>LKFY  
 for(int index=0;index<MAX_KEY;index++){ /-$`GT?l  
  if(hCallWnd[index]==hWnd){ <uL?7P  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ -3Vx jycY  
    hCallWnd[index]=NULL; |Xd[%W)  
    HotKey[index]=0; N)RWC7th{  
    HotKeyMask[index]=0; ;sNyN#  
    bRemoved=TRUE; 5"y p|Yl  
    KeyCount--; D +)6#i Y  
    break; 5]; 8  
   } 5DyN=[b  
  } /Fh"Gl^  
 } [ZURs3q  
 return bRemoved; dWD,iO_"@  
} *8/Q_w  
W\U zw,vI  
'A !Dg  
  DLL中的钩子函数如下: )dF(5,y)  
A i9*w?C  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) NfR,m ]  
{ '[Oi_gE.  
 BOOL bProcessed=FALSE;  R76'1o  
 if(HC_ACTION==nCode) l(=#c/f  
 { 1a4QWGpq  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 (fh:q2E#  
   switch(wParam) H gNUr5p  
   {  /GM-#q a  
    case VK_MENU: /gy;~eB01  
     MaskBits&=~ALTBIT; D{'Na5(  
     break; L{^DZg|E  
    case VK_CONTROL: bHS2;K~  
     MaskBits&=~CTRLBIT; jI;bVG  
     break; $o]zNW;X  
    case VK_SHIFT: GetUCb%1  
     MaskBits&=~SHIFTBIT; XN=<s;U  
     break; ~g|e?$j  
    default: //judge the key and send message ,C&h~uRi#f  
     break; $Q{1^  
   } XZ|"7as  
   for(int index=0;index<MAX_KEY;index++){ niy@'  
    if(hCallWnd[index]==NULL) [b#jw,7  
     continue; 3<mv9U(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @%\ANM$S  
    { RX2= iO"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); oSa FmP  
     bProcessed=TRUE; bq(*r:`"  
    } /mD KQ<  
   } &2xYG{Z  
  } cWRB=`=qz  
  else if((lParam&0xc000ffff)==1){ //有键按下 lf|^^2'*2<  
   switch(wParam) ['R=@.  
   { M\v4{\2l0  
    case VK_MENU: "apv)xdW  
     MaskBits|=ALTBIT; (6h7'r $  
     break; $\^]MxI  
    case VK_CONTROL: <q[ *kr  
     MaskBits|=CTRLBIT; e#nTp b  
     break; &PgdCijGq;  
    case VK_SHIFT: --^D)n  
     MaskBits|=SHIFTBIT; ok6e=c '  
     break; J$EEpL  
    default: //judge the key and send message +'n1?^U  
     break; +] 5a(/m.~  
   } @ WaYU  
   for(int index=0;index<MAX_KEY;index++){ *a!!(cZZ  
    if(hCallWnd[index]==NULL) s.'\&B[  
     continue; x[UO1% _o-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) I})t  
    { K/`RZ!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); GDp p`'\  
     bProcessed=TRUE; Q/)ok$A&  
    } "Q{~Bj~  
   } PU5mz.&0'  
  } ~uadivli  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 493i*j5r)l  
   for(int index=0;index<MAX_KEY;index++){ ~+C?][T  
    if(hCallWnd[index]==NULL) \5Vp6^  
     continue; L1 9 MP  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) }PI35i1!t  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); N.0HfYf  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 `RL,ZoYuu  
   } j|[(*i%7|  
  } G@!_ZM8h  
 } ?7yQ&p  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); @PQrmn6w  
} e&$p-0DmT|  
vuR5}/Ev  
  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: k,,!P""  
-`!_h[   
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Hz}+SAZ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); I9}+(6  
d"H<e}D  
  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: x.b; +p}=  
50LHF %  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) g7xbyB o7  
{ Gb2L }  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) WOX}Sw"  
 { #HAC*n  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 T95t"g?p  
  SaveBmp(); 0[T,O,y  
  return FALSE; M`7y>Ud  
 } eC! #CK  
 …… //其它处理及默认处理 dJ ~Zr)>  
} 9QwKakci  
XNehPZYS  
YoKs:e2/:  
  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。 ,LhCFw{8?~  
sOBu7!G%  
  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。 ZmEEj-*7s  
' cBBt  
  二、编程步骤 mi,&0xDe a  
Ps4 ZFX  
  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"; ["3\eFg  
x Q4%e[/  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 7Nzbz3  
N&,]^>^u  
  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; 4x;_AN  
+B}0=Ex$t  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; lDxc`S  
o0bM=njok  
  5、 添加代码,编译运行程序。 @-&MA)SN  
T,%j\0  
三、程序代码 pkgjTXR2b  
?jx1R^  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 4_/?:$KO  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) XH}'w9VynR  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ =u[k1s?  
#if _MSC_VER > 1000 eHiy,IN  
#pragma once !C4!LZ0A  
#endif // _MSC_VER > 1000 TZR)C P5  
#ifndef __AFXWIN_H__ oU*45B`"  
#error include 'stdafx.h' before including this file for PCH lQ'GX9hN@  
#endif ^T::-pN*  
#include "resource.h" // main symbols yQ,{p@#X8  
class CHookApp : public CWinApp ` Ag{)  
{ 7!WA)@6  
 public: U1nw- Q+  
  CHookApp(); |yEa5rd?W  
  // Overrides 9h4({EE2t  
  // ClassWizard generated virtual function overrides _tTNG2  
  //{{AFX_VIRTUAL(CHookApp) hrGM|_BE  
 public: c2t=_aAIPQ  
  virtual BOOL InitInstance(); \R36w^c3  
  virtual int ExitInstance(); !8NC# s  
  //}}AFX_VIRTUAL ?W^c4NtP  
  //{{AFX_MSG(CHookApp) hCjR&ZA  
  // NOTE - the ClassWizard will add and remove member functions here. w-wV3Q6X  
  // DO NOT EDIT what you see in these blocks of generated code ! scLn=  
  //}}AFX_MSG *t[. =_v  
  DECLARE_MESSAGE_MAP() '(bgs   
}; SCvVt  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 9l,a^@Y:  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); p$Ox'A4  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 26&'X+n&  
BOOL InitHotkey(); S"wR%\NIp  
BOOL UnInit(); 6f')6X'x  
#endif [W %$qZlP  
/x_o!<M  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 0U%f)mG  
#include "stdafx.h" V-<GT ?  
#include "hook.h" P:30L'.=[  
#include <windowsx.h> 1$M@]7e+!+  
#ifdef _DEBUG s l]_M  
#define new DEBUG_NEW ^6_e=jIN  
#undef THIS_FILE T!Hb{Cg*  
static char THIS_FILE[] = __FILE__; CC#;c1t  
#endif Vn*tp bz  
#define MAX_KEY 100 Ecd;<$tk  
#define CTRLBIT 0x04 Y. ,Kl~  
#define ALTBIT 0x02 JSW^dw&  
#define SHIFTBIT 0x01 sZx/Ee   
#pragma data_seg("shareddata") {}3${  
HHOOK hHook =NULL; M$Zcn#A  
UINT nHookCount =0; Z ?wU  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey O3I8k\`  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT VeW>[08  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey \v'p/G)g  
static int KeyCount =0; anXc|  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift /YZr~|65  
#pragma data_seg() c-B cA  
HINSTANCE hins; b )B? F  
void VerifyWindow();  o4|M0  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) W[Ls|<Q  
//{{AFX_MSG_MAP(CHookApp) N<~t3/Nm  
// NOTE - the ClassWizard will add and remove mapping macros here. e" St_z(  
// DO NOT EDIT what you see in these blocks of generated code! O^oWG&Y;v  
//}}AFX_MSG_MAP 8_{X1bj  
END_MESSAGE_MAP() V5UF3'3;}  
_f$^%?^  
CHookApp::CHookApp()  Vh_P/C+  
{ z6*X%6,8  
 // TODO: add construction code here, ,6-:VIHQ  
 // Place all significant initialization in InitInstance ;lHr =e7  
}  #"@|f  
HMSO=)@+  
CHookApp theApp; L7dd(^  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) uScMn/%  
{ a{L d  
 BOOL bProcessed=FALSE; Yt;MV)  
 if(HC_ACTION==nCode) Tf'hc]`vS  
 { 9[<)WQe6M  
  if((lParam&0xc0000000)==0xc0000000){// Key up KrQ1GepJ  
   switch(wParam) A~)D[CV  
   { lhy*h_>  
    case VK_MENU: As'=tIro  
     MaskBits&=~ALTBIT; P GqQ@6B  
     break; 1`=nWy='  
    case VK_CONTROL: ?8'*,bK  
     MaskBits&=~CTRLBIT; f4fvrL  
     break; LY%WD%pL  
    case VK_SHIFT: aAD^^l#  
     MaskBits&=~SHIFTBIT; 4K\G16'$v  
     break; I>W=x'PkLn  
    default: //judge the key and send message nLXlU*ES  
     break; KVclhT<F  
   } '=b/6@&  
   for(int index=0;index<MAX_KEY;index++){ +S o4rA*9  
    if(hCallWnd[index]==NULL) Q'=x|K#xj  
     continue; QIG$z?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) T&6l$1J  
    { B3 8]~'8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); GS$ifv  
     bProcessed=TRUE; g6j?,c|y  
    } Kp%2k^U  
   } >*35C`^  
  } Va"0>KX  
  else if((lParam&0xc000ffff)==1){ //Key down zdB^S%cztS  
   switch(wParam) !fE`4<|?  
   { Fs9!S a7v  
    case VK_MENU: q'T4w!V(V  
     MaskBits|=ALTBIT; ldU?{o:\s  
     break; D4eDHq  
    case VK_CONTROL: y0L_"e/  
     MaskBits|=CTRLBIT; N G+GEqx  
     break; oH97=>  
    case VK_SHIFT: +%<(E  
     MaskBits|=SHIFTBIT; 'j#*6xD  
     break; dqU~`b9  
    default: //judge the key and send message fK>L!=Q  
     break; \ 2M_\Q`NY  
   } n(1l}TJy  
   for(int index=0;index<MAX_KEY;index++) 3dg1DR;  
   { .s?L^Z^  
    if(hCallWnd[index]==NULL) &* M!lxDN  
     continue; (S>C#A=E\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) V(H1q`ao9  
    { BX`{73sw  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Ua:}Vn&!  
     bProcessed=TRUE; t% d Z-Ym  
    } LBw1g<&  
   } (nQ^  
  } KI"#f$2&  
  if(!bProcessed){ `KZm0d{H  
   for(int index=0;index<MAX_KEY;index++){ d[iQ` YW5  
    if(hCallWnd[index]==NULL) h79}qU  
     continue; /CrSu  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 5AFJC?   
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); {&&z-^  
   } 4>wP7`/+y  
  } Xr,1&"B&t  
 } Hus)c3Ty7  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ik)|{%!K]H  
} 8?xE6  
(d(CT;  
BOOL InitHotkey() {i;r  
{ ;YaQB#GK%  
 if(hHook!=NULL){ )HEa<P^kJl  
  nHookCount++; )*$lp'~7N  
  return TRUE; ^ gdaa>L  
 } jk;j2YNPw  
 else &h}#HS>l  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); |Tv#4st  
  if(hHook!=NULL) Sj3+l7S?  
   nHookCount++; z0 d.J1VW  
  return (hHook!=NULL); akmkyrz'&  
} D(~U6SR  
BOOL UnInit() em y[k  
{ dn& s*  
 if(nHookCount>1){ !Lu2  
  nHookCount--; ,V7nzhA2  
  return TRUE; ncaT?~u j  
 } 0- B5`=yU  
 BOOL unhooked = UnhookWindowsHookEx(hHook); n'"/KS+_  
 if(unhooked==TRUE){ &5>Kl}7  
  nHookCount=0; YX!iL6?~  
  hHook=NULL; T~-ycVc  
 } pJ>P[  
 return unhooked; 49eD1h3'X[  
} Mc)}\{J  
W<'m:dq  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Jx:Y-$  
{ %7hrk  
 BOOL bAdded=FALSE; kj Jn2c:y  
 for(int index=0;index<MAX_KEY;index++){ aHD]k8 m z  
  if(hCallWnd[index]==0){ 9p]QM)M  
   hCallWnd[index]=hWnd; !M(xG%M-V  
   HotKey[index]=cKey; ~-k9%v`  
   HotKeyMask[index]=cMask;  -uS!\  
   bAdded=TRUE; 1Yq!~8  
   KeyCount++; h0EEpL|\  
   break; 5%"V[lDx@  
  } ]U+ LJOb  
 } /l3V3B7  
 return bAdded; ,CJWO bn3  
} hDDn,uzpd  
:@Pl pF K  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 3<Lx&p~%T  
{ w?L6!)oiz  
 BOOL bRemoved=FALSE; RbB.q p  
 for(int index=0;index<MAX_KEY;index++){ p%ki>p )E|  
  if(hCallWnd[index]==hWnd){ PI {bmZ  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Xg6Jh``  
    hCallWnd[index]=NULL; yxPazz  
    HotKey[index]=0; /|}EL%a  
    HotKeyMask[index]=0; +|3@=.V  
    bRemoved=TRUE; `bq<$e  
    KeyCount--; <sbu;dQ`  
    break; 70?\ugxA  
   } hPkp;a #  
  } qZdQD  
 } L(6d&t'|-R  
 return bRemoved; H*n-_{h"t  
} C[cbbp  
`7E;VL^Y1  
void VerifyWindow() , >a&"V^k  
{ h,:m~0gmj  
 for(int i=0;i<MAX_KEY;i++){ LBeF&sb6  
  if(hCallWnd!=NULL){ >58YjLXb  
   if(!IsWindow(hCallWnd)){ j^sg6.Z*  
    hCallWnd=NULL; LH.]DVj  
    HotKey=0; ;nfdGB  
    HotKeyMask=0; LVM%"sd?  
    KeyCount--; Y(y kng  
   } s[>,X#7 y  
  } Qp5VP@t  
 } -m zIT4  
} B3`5O[ 6  
a=_g*OK}D  
BOOL CHookApp::InitInstance() QE+g j8  
{ Evq IcZ  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); =j_4S<  
 hins=AfxGetInstanceHandle(); 1s&zMWC  
 InitHotkey(); n+9=1Oo"  
 return CWinApp::InitInstance(); NN{?z!  
} /U*C\ xMm  
s]0{a.Cpv  
int CHookApp::ExitInstance() oH?b}T=9jz  
{ [85spub&}  
 VerifyWindow(); O/(`S<iip  
 UnInit(); D/gw .XYL  
 return CWinApp::ExitInstance(); C==hox7b  
} ?4}h&/  
@i_FTN  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Vm(y7}Aq{  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) `$IK`O  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 2a)xTA#  
#if _MSC_VER > 1000 ^Z+?h &%%  
#pragma once 1-uxC^u?|#  
#endif // _MSC_VER > 1000 2jItq2.>  
2zA4vZkbcw  
class CCaptureDlg : public CDialog  -);Wfs  
{ (,\+tr8r8  
 // Construction r +i($ jMs  
 public: bH9kj/q\b  
  BOOL bTray; | j`@eF/"  
  BOOL bRegistered; 1=c\Rr9]  
  BOOL RegisterHotkey(); x+:UN'"r  
  UCHAR cKey; OZF rtc+  
  UCHAR cMask; [b%D3-}'  
  void DeleteIcon(); A`$%SVgFV^  
  void AddIcon(); bo>*fNqAIy  
  UINT nCount; ek\ xx  
  void SaveBmp(); 4[r0G+  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor P )"m0Lu<  
  // Dialog Data nNV'O(x}  
  //{{AFX_DATA(CCaptureDlg) /9*B)m"  
  enum { IDD = IDD_CAPTURE_DIALOG }; }eU*( }<^  
  CComboBox m_Key; J1|\Q:-7p  
  BOOL m_bControl; ^zmG0EH,  
  BOOL m_bAlt; Qj.#)R  
  BOOL m_bShift; )[6U^j4  
  CString m_Path; ]@c+]{  
  CString m_Number; #U4F0BdA  
  //}}AFX_DATA r'r%w#=`t  
  // ClassWizard generated virtual function overrides zkrM/ @p#  
  //{{AFX_VIRTUAL(CCaptureDlg) 6 7.+ .2  
 public: -HbC!w v  
  virtual BOOL PreTranslateMessage(MSG* pMsg); z+wA rPxc  
 protected: ItVWO:x&v  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support  / }X1W  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); -H@:*  
  //}}AFX_VIRTUAL 81F/G5  
  // Implementation z"L/G  
 protected: Ecefi pG  
  HICON m_hIcon; ~9]hV7y5C  
  // Generated message map functions 3?9IJ5p  
  //{{AFX_MSG(CCaptureDlg) RDi]2  
  virtual BOOL OnInitDialog(); t;Sb/3  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); M61xPq8y5  
  afx_msg void OnPaint(); [< ?s?Ci  
  afx_msg HCURSOR OnQueryDragIcon(); _\G"9,)u '  
  virtual void OnCancel(); }Yzco52  
  afx_msg void OnAbout(); HY*Kb+[  
  afx_msg void OnBrowse(); Egp/f|y  
  afx_msg void OnChange();  a=9:[  
 //}}AFX_MSG 0/MtYIYk  
 DECLARE_MESSAGE_MAP() 1\ ~ "VF*{  
}; ?k&Vy  
#endif ,t?B+$E  
^z IW+:  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file O)*+="Rg  
#include "stdafx.h" HGs $*  
#include "Capture.h" D6Ui!  
#include "CaptureDlg.h" r&JgLC(   
#include <windowsx.h> s}9S8@#  
#pragma comment(lib,"hook.lib") p!7FpxZY  
#ifdef _DEBUG m@2QnA[ 4  
#define new DEBUG_NEW <I\/n<*  
#undef THIS_FILE kR-SE5`Jk  
static char THIS_FILE[] = __FILE__; 3vN_p$  
#endif #ym'AN  
#define IDM_SHELL WM_USER+1 :'-/NtV)o?  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 'Ym9;~(@R  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); E)5\i-n  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; t ;;U}  
class CAboutDlg : public CDialog IqaT?+O\?r  
{ N=5a54!/  
 public: v\gLWq'  
  CAboutDlg(); l'-Bu(  
  // Dialog Data xQ-<WF1i  
  //{{AFX_DATA(CAboutDlg) wx= $2N6  
  enum { IDD = IDD_ABOUTBOX }; Q:G4Z9Kt  
  //}}AFX_DATA qs6]-  
  // ClassWizard generated virtual function overrides 6 l|DU7i  
  //{{AFX_VIRTUAL(CAboutDlg) (l~AV9!m:  
 protected: /tx]5`#@7]  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 6$Xzpg(o  
  //}}AFX_VIRTUAL %+W{iu[|  
  // Implementation )Xz,j9GzJS  
 protected: QC OM_$y  
  //{{AFX_MSG(CAboutDlg) "Y =;.:qe  
  //}}AFX_MSG 2 /\r)$ 2i  
  DECLARE_MESSAGE_MAP() o4F2%0gJ  
}; a od-3"7[  
6 6EV$*dRL  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) VK\X&Y3l  
{ +K:Dx!9  
 //{{AFX_DATA_INIT(CAboutDlg) {0Yf]FQb-a  
 //}}AFX_DATA_INIT #C74z$  
} Z*]9E^  
%op**@4/t\  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 1y@i}<9F  
{ n`B:;2X,  
 CDialog::DoDataExchange(pDX); %A9NB!  
 //{{AFX_DATA_MAP(CAboutDlg) *MhRW,=  
 //}}AFX_DATA_MAP GbY7_N  
}  ul6]!Iy  
.nf#c.DI  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) F4-$~ v@  
 //{{AFX_MSG_MAP(CAboutDlg) ^+>laOzC`8  
 // No message handlers Q2w_X8  
 //}}AFX_MSG_MAP I#Y22&G1  
END_MESSAGE_MAP() WtsFz*`)y  
njB;&N)I  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ed{ -/l~j  
: CDialog(CCaptureDlg::IDD, pParent) f M :]&  
{ bivuqKA  
 //{{AFX_DATA_INIT(CCaptureDlg) $Ps|HN  
  m_bControl = FALSE; }#RakV4  
  m_bAlt = FALSE; `t>l:<@%  
  m_bShift = FALSE; A7Cm5>Y_S  
  m_Path = _T("c:\\"); $u6"*|  
  m_Number = _T("0 picture captured."); $t'MSlF  
  nCount=0; \g`\`e53?  
  bRegistered=FALSE; vFzRg5lH  
  bTray=FALSE; 7FP*oN?  
 //}}AFX_DATA_INIT 8+Lm's=W*  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 U/66L+1  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); V# }!-Xj  
} u OmtyX  
[: n'k  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) t9GR69v:?  
{ P-9)38`5  
 CDialog::DoDataExchange(pDX); wv>^0\o  
 //{{AFX_DATA_MAP(CCaptureDlg) T$)^gHS  
  DDX_Control(pDX, IDC_KEY, m_Key); :%_LpZ  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); U*rcd-@  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ,\W 8b-Z  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 8?B!2  
  DDX_Text(pDX, IDC_PATH, m_Path); A_"w^E{P  
  DDX_Text(pDX, IDC_NUMBER, m_Number); q<x/Hat)  
 //}}AFX_DATA_MAP ;0]aq0_#(  
} G=s}12/Z"{  
T#T*Zw"+  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog)  sg^zH8,3  
//{{AFX_MSG_MAP(CCaptureDlg) R"/GQ`^AqA  
 ON_WM_SYSCOMMAND() f <Zxz9  
 ON_WM_PAINT() yM6pd U]i  
 ON_WM_QUERYDRAGICON() B {n,t}z  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 1SQ3-WU s  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) =g7x' kN  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 9R!atPz9  
//}}AFX_MSG_MAP *?@?f&E/  
END_MESSAGE_MAP() NR$3%0 nC6  
>4x(e\B  
BOOL CCaptureDlg::OnInitDialog() H5/6TX72N  
{ kUb>^- -K  
 CDialog::OnInitDialog(); B-RjMxX4>  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); W<h)HhyG  
 ASSERT(IDM_ABOUTBOX < 0xF000); hk;5w{t}}  
 CMenu* pSysMenu = GetSystemMenu(FALSE); E<rp7~#  
 if (pSysMenu != NULL) &~cBNw|  
 { )NW)R*m~D  
  CString strAboutMenu; /cUO$m o  
  strAboutMenu.LoadString(IDS_ABOUTBOX); aL\PGdgO  
  if (!strAboutMenu.IsEmpty()) ^`i#$  
  { LRxZcxmy  
   pSysMenu->AppendMenu(MF_SEPARATOR); udK%>  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); i'<[DjMDlm  
  } >%_\;svZG  
 }  \{_q.;}  
 SetIcon(m_hIcon, TRUE); // Set big icon O0x,lq  
 SetIcon(m_hIcon, FALSE); // Set small icon J/`<!$<c  
 m_Key.SetCurSel(0); RXMISt3+{y  
 RegisterHotkey(); tH@Erh|%  
 CMenu* pMenu=GetSystemMenu(FALSE); I.(, hFx;  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 3GYw+%Z]  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); *g"Nq+i@  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); soB,j3#p'*  
 return TRUE; // return TRUE unless you set the focus to a control tn\yI!a  
} Pjf"CW+A  
vQG5*pR*w  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) UkwP  
{ Rxt^v+ ,$  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 98c(<  
 { ZL&qp04}  
  CAboutDlg dlgAbout; 0@0w+&*"@  
  dlgAbout.DoModal(); 4/~E4"8  
 } tPWLg),  
 else 8.1c?S  
 { >{n,L6_ t  
  CDialog::OnSysCommand(nID, lParam); HQ_Ok `  
 } ='r!g  
} _#E0g'3  
un"Gozmt5  
void CCaptureDlg::OnPaint() IVnHf_PzF  
{ IZ-1c1   
 if (IsIconic()) |)DGkOtd  
 { / y40(l?  
  CPaintDC dc(this); // device context for painting fSj5ZsO  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); CT <7mi!  
  // Center icon in client rectangle VR8-&N  
  int cxIcon = GetSystemMetrics(SM_CXICON); y3Qsv  
  int cyIcon = GetSystemMetrics(SM_CYICON); ij`w} V  
  CRect rect; QD&`^(X1p  
  GetClientRect(&rect); 2eS~/Pq5=i  
  int x = (rect.Width() - cxIcon + 1) / 2; z=\&i\>;Z+  
  int y = (rect.Height() - cyIcon + 1) / 2; +4~_Ei[i  
  // Draw the icon WM$ MPs  
  dc.DrawIcon(x, y, m_hIcon); K hR81\  
 } ;u ({\K  
 else k/_ 59@)  
 { :uS\3toj  
  CDialog::OnPaint(); ;%9|k U  
 } 3AtGy'NTp  
} N7zft  
YQvD|x  
HCURSOR CCaptureDlg::OnQueryDragIcon() 3,3N^nSD  
{ z (wc0I  
 return (HCURSOR) m_hIcon; e\l7Iu  
} (*'f+R`$  
kd(8I_i@  
void CCaptureDlg::OnCancel() ORw,)l  
{ ,AFu C <  
 if(bTray) cd_yzpL@}J  
  DeleteIcon(); )F>#*P  
  CDialog::OnCancel(); ,/I.t DH  
} `i*E~'  
g3/W=~r  
void CCaptureDlg::OnAbout() 9wwqcx)3(  
{ B%b4v  
 CAboutDlg dlg; L|xbR#v  
 dlg.DoModal(); $k%2J9O  
} I"<\<^B<  
\'D0'\:vz  
void CCaptureDlg::OnBrowse() *Kg ks4  
{ mxC;?s;~  
 CString str; WX?IYQ+  
 BROWSEINFO bi; *)T^Ch D,  
 char name[MAX_PATH]; nRS}}6Q  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Jhhb7uU+  
 bi.hwndOwner=GetSafeHwnd(); oW*16>IN9l  
 bi.pszDisplayName=name; kJsN|=  
 bi.lpszTitle="Select folder"; d.d/<  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; E A1?)|}n  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); .j0$J\:i  
 if(idl==NULL) J @1!Oq>  
  return; Ckuh:bs  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); E KLyma&}Y  
 str.ReleaseBuffer(); om z  
 m_Path=str; DU/]  
 if(str.GetAt(str.GetLength()-1)!='\\') m@v\(rT.  
  m_Path+="\\"; ;))+>%SGCt  
 UpdateData(FALSE); h2]P]@nW;W  
} {@{']Y  
MaQqs=  
void CCaptureDlg::SaveBmp() @9RM9zK.q  
{ FbFPJ !fb  
 CDC dc; BG]#o| KW  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); YfKdR"i+.  
 CBitmap bm; L48_96  
 int Width=GetSystemMetrics(SM_CXSCREEN); rcG"o\g@+  
 int Height=GetSystemMetrics(SM_CYSCREEN); C XMLt  
 bm.CreateCompatibleBitmap(&dc,Width,Height); c]o'xd,T8\  
 CDC tdc; plstZ,#j  
 tdc.CreateCompatibleDC(&dc); "e>;'%W  
 CBitmap*pOld=tdc.SelectObject(&bm); fxHH;hRfv  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Flm%T-Dl  
 tdc.SelectObject(pOld); LCKV>3+_#  
 BITMAP btm; sBg.u  
 bm.GetBitmap(&btm); 8dIgjQX|  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; :J&oX <nF^  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); vr6w^&[c^  
 BITMAPINFOHEADER bih; s-Tv8goNV  
 bih.biBitCount=btm.bmBitsPixel; hD!7Cl Q  
 bih.biClrImportant=0; 2-EIE4ds  
 bih.biClrUsed=0; '-XXo=>0MV  
 bih.biCompression=0; v^*K:#<Q!  
 bih.biHeight=btm.bmHeight; qqY"*uJ'  
 bih.biPlanes=1; !?h;wR  
 bih.biSize=sizeof(BITMAPINFOHEADER); Z=o2H Bm7  
 bih.biSizeImage=size; z$. 88 ^  
 bih.biWidth=btm.bmWidth; N<VJ(20y  
 bih.biXPelsPerMeter=0; ?NsW|w_  
 bih.biYPelsPerMeter=0; X5$Iyis  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 0~/_|?]`7  
 static int filecount=0; @K !T,U  
 CString name; Qe:seW  
 name.Format("pict%04d.bmp",filecount++); JjTegQN  
 name=m_Path+name; WW~sNC\3`(  
 BITMAPFILEHEADER bfh; \Uq(Zga4)  
 bfh.bfReserved1=bfh.bfReserved2=0; &}B|"s[  
 bfh.bfType=((WORD)('M'<< 8)|'B'); BW*rIn<?G  
 bfh.bfSize=54+size; +iRh  
 bfh.bfOffBits=54; U$z-e/  
 CFile bf; UySZbmP48  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ +',S]Edx  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Dp-z[]})1  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); S;#'M![8  
  bf.WriteHuge(lpData,size); +VOK%8,p  
  bf.Close(); <R=Zs[9M1  
  nCount++; M%P:n/j  
 } {B*s{{[/'  
 GlobalFreePtr(lpData); m~0/&RA  
 if(nCount==1) )zdQ1&@  
  m_Number.Format("%d picture captured.",nCount); w+u3*/Zf  
 else \\;jw[P0  
  m_Number.Format("%d pictures captured.",nCount); I:1C8*/  
  UpdateData(FALSE); T}v4*O.,  
} R8Fv{7]c  
~U&AI1t+J  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 5K8^WK  
{ ~dTrf>R8M  
 if(pMsg -> message == WM_KEYDOWN) z5*'{t)  
 { l}A93jSL  
  if(pMsg -> wParam == VK_ESCAPE) M@v.c; Lt  
   return TRUE; tW}'g:s  
  if(pMsg -> wParam == VK_RETURN) MeZf*' J  
   return TRUE; VQOezQs\  
 } #BH*Z(  
 return CDialog::PreTranslateMessage(pMsg); |#R7wnE[k~  
} $suzW;{#  
pB0 \\wR  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ":QZy8f9%  
{ vy:Z/1q  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ |[b{)s?x  
  SaveBmp(); 5vnrA'BhBU  
  return FALSE; 0*{%=M  
} 5 #E`=C%  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ,/|T-Ka  
 CMenu pop; A#YrWW  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); )irEM  
 CMenu*pMenu=pop.GetSubMenu(0); CB}2j  
 pMenu->SetDefaultItem(ID_EXITICON); U9MxI%tb  
 CPoint pt; @_}P-h  
 GetCursorPos(&pt); G2: agqL/  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); kc`Tdn  
 if(id==ID_EXITICON) 8&b,qQ~  
  DeleteIcon(); 8[{ Vu0R  
 else if(id==ID_EXIT) Z=vU}S>r|v  
  OnCancel(); =]0&i]z[.  
 return FALSE; m^;f(IK5  
} i?^L/b`H  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); FJ)$f?=Qd  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) X$W~mQma6  
 AddIcon(); h>m"GpF x  
 return res; toC^LZgZ_6  
} uJ v-4H  
9InVQCf2J  
void CCaptureDlg::AddIcon() gp.^~p]x  
{ q^<?]8  
 NOTIFYICONDATA data; 2`=7_v  
 data.cbSize=sizeof(NOTIFYICONDATA); 49HZ2`Y  
 CString tip; ;>7De8v@@  
 tip.LoadString(IDS_ICONTIP); v mk2{f,g  
 data.hIcon=GetIcon(0); nZYBE030  
 data.hWnd=GetSafeHwnd(); *b\t#meS&  
 strcpy(data.szTip,tip); }:)&u|d_  
 data.uCallbackMessage=IDM_SHELL; Q>i^s@0  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; O3kA;[f;  
 data.uID=98; YT(AUS5n  
 Shell_NotifyIcon(NIM_ADD,&data); -6B4sZpzD  
 ShowWindow(SW_HIDE); =Jb>x#Y  
 bTray=TRUE; H"WprHe  
} Z/+#pWBI!  
o!A+&{  
void CCaptureDlg::DeleteIcon() JZyAXm%  
{ Jdj4\j u  
 NOTIFYICONDATA data; 7hPY_W y  
 data.cbSize=sizeof(NOTIFYICONDATA); o&$A]ph8X  
 data.hWnd=GetSafeHwnd(); r* Ca}Z  
 data.uID=98; -ZLJeY L  
 Shell_NotifyIcon(NIM_DELETE,&data); 5$C-9  
 ShowWindow(SW_SHOW); $6SW;d+>n  
 SetForegroundWindow(); +52{-a,>  
 ShowWindow(SW_SHOWNORMAL); ~b8]H|<'Y  
 bTray=FALSE; pFjK}J OF  
} -(H0>Ap  
1iF1GkLEq  
void CCaptureDlg::OnChange() TOQP'/   
{ {R `[kt  
 RegisterHotkey(); 0LJv'  
} $ (x]  
>~0Z& d  
BOOL CCaptureDlg::RegisterHotkey() {"KMs[M  
{ 92oFlEJ  
 UpdateData(); kE1TP]|  
 UCHAR mask=0; I%KYtv~ `  
 UCHAR key=0; b4N[)%@  
 if(m_bControl) ?4T-@~~*`=  
  mask|=4; ' S/gmn  
 if(m_bAlt) pTLCWbF?  
  mask|=2; GnJt0{  
 if(m_bShift) tc_3sC7jN  
  mask|=1; nAlQ7 '  
  key=Key_Table[m_Key.GetCurSel()]; + v:SM 9  
 if(bRegistered){ R.<g3"Lm>  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); b@hqz!)l`  
  bRegistered=FALSE; SXP]%{@ R/  
 } V(!V_Ug9.  
 cMask=mask; U|R_OLWAg  
 cKey=key; (CWtLi"z  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); l+0oS'`V*L  
 return bRegistered; bW(0Ng  
} Nu)NqFG,  
Yrq~5)%  
  四、小结 e~"U @8xk~  
G$('-3@i`w  
  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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