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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: }}a<!L,{  
  D-)jmz>R  
  一、实现方法 =^. f)  
3kxI'0&T  
  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: :t &ib}v  
d*%-r2K  
#pragma data_seg("shareddata") Am~ NBQ7  
HHOOK hHook =NULL; //钩子句柄 F...>%N$  
UINT nHookCount =0; //挂接的程序数目 Dp:u!tdbeg  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 9Y:JA]U&8  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 B_FfXFQm<  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey @Q:5{?  
static int KeyCount =0; ,E]u[7A  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 !!Tk'=t9"3  
#pragma data_seg() PV?XpT  
0sjw`<ic  
  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。 pg3B^  
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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: 8l|v#^v  
)A]E:]2  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR "hRw_<  
cKey,UCHAR cMask) ZN)a}\]  
{ *uYnu|UQH  
 BOOL bAdded=FALSE; <y${Pkrj  
 for(int index=0;index<MAX_KEY;index++){ ayfZ>x{s*  
  if(hCallWnd[index]==0){ 0mB]*<x8  
   hCallWnd[index]=hWnd; 27b7~!  
   HotKey[index]=cKey; !:Lb^C;/  
   HotKeyMask[index]=cMask; HR'r~ #j  
   bAdded=TRUE; 8Rq+eOP=S  
   KeyCount++; jEBZ"Jvb  
   break; MRvtuE|g  
  } {;4AdZk  
 } ;I'pC?!y  
 return bAdded; `Q!|/B  
} J~z;sTR  
//删除热键 c1j)  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) A(y^1Nm  
{ n8"S;:Zm  
 BOOL bRemoved=FALSE; CFJ F}aW  
 for(int index=0;index<MAX_KEY;index++){ kq6K<e4jO  
  if(hCallWnd[index]==hWnd){ v'`9^3(-  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Dx/!^L02  
    hCallWnd[index]=NULL; v#/Uq?us  
    HotKey[index]=0; Ou IoO  
    HotKeyMask[index]=0; VNx|nP&  
    bRemoved=TRUE; }?B=R#5  
    KeyCount--; >So)KB  
    break; ]saf<?fzr  
   } (j-[m\wF  
  } kvh}{@|-  
 } 1 O+4A[cr  
 return bRemoved; >8;Co]::kx  
} gO-C[j/  
TRG(W^<F  
!pI)i*V|  
  DLL中的钩子函数如下: Xz5 aTJ&  
CQfrAk4mu  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) {H eIY2  
{ gkS#=bv9e@  
 BOOL bProcessed=FALSE; *a Y`[,4#$  
 if(HC_ACTION==nCode) P[PBoRd2  
 { lp5`Kw\  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 'j=7'aX>K  
   switch(wParam)  D/hQ{T  
   {  E)|_7x<u  
    case VK_MENU: pYV$sDlD  
     MaskBits&=~ALTBIT; JsOPI ]  
     break; yEUFK  
    case VK_CONTROL: UM%[UyYQ  
     MaskBits&=~CTRLBIT; <by}/lF0  
     break; "iE9X.6NMu  
    case VK_SHIFT: p~M1}mE  
     MaskBits&=~SHIFTBIT; =tl[?6  
     break; MP,l*wVd  
    default: //judge the key and send message Iw~3y{\  
     break; VY8 p[`  
   } Ky`rf}cI>  
   for(int index=0;index<MAX_KEY;index++){ W?{:HV  
    if(hCallWnd[index]==NULL) |E-0P=h  
     continue; /E(H`;DG  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) y|b|_eE?{  
    { S4kGy}{+i  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); &9\z!r6mc  
     bProcessed=TRUE; J=>?D@K  
    } QOIi/flK  
   } Okca6=2"  
  } .EVy?-   
  else if((lParam&0xc000ffff)==1){ //有键按下 vBsd.2t~  
   switch(wParam) w3:WvA5jt  
   { !mK[kXo  
    case VK_MENU: hNUAwTH6  
     MaskBits|=ALTBIT; N]: "3?%  
     break; IXt2R~b  
    case VK_CONTROL: .z+?b8Q\  
     MaskBits|=CTRLBIT; o#E 3{zM  
     break; YKLh$  
    case VK_SHIFT: =nOV!!  
     MaskBits|=SHIFTBIT; HyXw^ +tsj  
     break; EDvK9J  
    default: //judge the key and send message Pgg6(O9}B^  
     break; NAhV8  
   } ` =dD6r  
   for(int index=0;index<MAX_KEY;index++){ &oiX/UaY  
    if(hCallWnd[index]==NULL) z h0m3|9O  
     continue; 4NbX! "0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 4cL NPl<  
    { 3tI=? E#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); r9@O`i  
     bProcessed=TRUE; .%`|vGF  
    } +Uq9C-Iu  
   } wNDLN`,^H  
  } `|wH=  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 mp0p#8txi  
   for(int index=0;index<MAX_KEY;index++){ -2|D( sO  
    if(hCallWnd[index]==NULL) lO8.Q"mxo  
     continue; ?AP2Opsl  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) b$[_(QUw  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); I*@\pc}  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 QRdNi 1&M  
   } l9 )iLOj  
  } YS,kjL/  
 } #h ;j2  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); hxx,E>k  
} |8&AsQd  
Km]N scq1  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: )V JAs|  
+%X_+9bd  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); k@5#^G  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); "$+naY{w  
SDiZOypS  
  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: jd l1Q<Z  
|`s}PcV  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) B+);y  
{ = Ii@-C  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) swG^L$r`  
 { 8_>\A= E  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 =b32E^z,  
  SaveBmp(); CB_(9T72H  
  return FALSE; lZ0+:DaP2  
 } BQSA;;n]  
 …… //其它处理及默认处理 J=*y>Zt-b  
} T =3te|fv  
)&+_T+\  
o}v # Df  
  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。 _4o2AS:j  
\bQ|O7s  
  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。 oF.Fg<p (  
&Xe r#6~  
  二、编程步骤 f Otrn  
, 9|%  
  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"; PZNo.0M70  
=t@m:  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; x~s>  
}yx{13:[  
  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|=^@F_\`  
FtM7+>Do.  
  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; $DA0lY\  
{9;~xxTo  
  5、 添加代码,编译运行程序。 wuzz Wq  
KyXgw  
三、程序代码 dtA- 4Ndm  
dwrc"GK!o  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL F Paj p  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 1GOa'bxm  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ qqw6p j  
#if _MSC_VER > 1000 H xb{bF  
#pragma once l]WV?^*  
#endif // _MSC_VER > 1000 6 $ IXER  
#ifndef __AFXWIN_H__ ~(aq3ngo.  
#error include 'stdafx.h' before including this file for PCH ?[RG8,B  
#endif ^+`vh0TPQ  
#include "resource.h" // main symbols Redp'rXT<h  
class CHookApp : public CWinApp [2i+f <  
{ MF 5w.@62X  
 public: 4Xz6JJ1U[H  
  CHookApp(); *!Am6\+  
  // Overrides |\QR9>  
  // ClassWizard generated virtual function overrides !Q.c8GRUQ  
  //{{AFX_VIRTUAL(CHookApp) rA` zuYo  
 public: L%B+V;<h3  
  virtual BOOL InitInstance(); iM8hGQ`  
  virtual int ExitInstance(); )[p8  
  //}}AFX_VIRTUAL W**=X\"'  
  //{{AFX_MSG(CHookApp) te6[^_k  
  // NOTE - the ClassWizard will add and remove member functions here. !ox&`  
  // DO NOT EDIT what you see in these blocks of generated code ! v[Q)cqj/  
  //}}AFX_MSG l06 q1M 3  
  DECLARE_MESSAGE_MAP() /;OJ=x3i  
}; S BFhC  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); v~jN,f*  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); EAY9~b6~c  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); N->;q^  
BOOL InitHotkey(); JYSw!!eC  
BOOL UnInit(); ="A[*:h C"  
#endif 5@0c@Q  
}rO4b>J  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. *s%s|/  
#include "stdafx.h" (S2<6Nm8  
#include "hook.h" 2Cr+Z(f  
#include <windowsx.h> >hQR  
#ifdef _DEBUG ise@,[!  
#define new DEBUG_NEW 8U;!1!+ 7)  
#undef THIS_FILE aLsGden|  
static char THIS_FILE[] = __FILE__; vi5~Rd`  
#endif spl*[ d  
#define MAX_KEY 100 s &.Z;X  
#define CTRLBIT 0x04 R=e`QMq  
#define ALTBIT 0x02 htF&VeIte  
#define SHIFTBIT 0x01 xDQ$Ui.  
#pragma data_seg("shareddata") y.O? c &!  
HHOOK hHook =NULL; wR;l"*j  
UINT nHookCount =0; 4U6{E#  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey piId5Gx7  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT wZC'BLD  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey s]I],>}RU  
static int KeyCount =0; PN'8"8`{  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift }2\"(_  
#pragma data_seg() <5X@r#Lz  
HINSTANCE hins; -"cN9RF  
void VerifyWindow(); [ =9R5.)c  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) $< aBawLZO  
//{{AFX_MSG_MAP(CHookApp) CD[7h  
// NOTE - the ClassWizard will add and remove mapping macros here. `Ch6"= t  
// DO NOT EDIT what you see in these blocks of generated code! a6]!4  
//}}AFX_MSG_MAP +]>a`~   
END_MESSAGE_MAP() $(NfHIX  
~'U;).C  
CHookApp::CHookApp() JNu- z:J  
{ - a=yi d  
 // TODO: add construction code here, Kz<xuulr  
 // Place all significant initialization in InitInstance w1}[lq@  
} c8'8DM  
jqLyX  
CHookApp theApp; V\G>e{  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) `j(+Y  
{ O[`Ob6Q{F  
 BOOL bProcessed=FALSE; va<+)b\  
 if(HC_ACTION==nCode) _ 4W#6!  
 { -m @s 9k  
  if((lParam&0xc0000000)==0xc0000000){// Key up kN^)6  
   switch(wParam) h49Q2`  
   { |`okIqp  
    case VK_MENU: ~H$XSNPi  
     MaskBits&=~ALTBIT; g|zK%tR_P  
     break; FjydEV  
    case VK_CONTROL: kzmt'/L8  
     MaskBits&=~CTRLBIT; XMdc n,  
     break; vr  vzV  
    case VK_SHIFT: D# $gdjZ  
     MaskBits&=~SHIFTBIT; - VE#:&  
     break; w\mF2h  
    default: //judge the key and send message K@i*Nl  
     break; _kd |:,  
   } HUghl2L.<  
   for(int index=0;index<MAX_KEY;index++){ Z-<u?f8{*  
    if(hCallWnd[index]==NULL) ~h@tezF  
     continue; \1Bgs^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9?:S:Sq  
    { Ocb2XEF  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); G<z)Ydh_  
     bProcessed=TRUE; C1/jA>XW  
    } {#%xq]r_  
   } 4 * OU  
  } [v`4OQF/  
  else if((lParam&0xc000ffff)==1){ //Key down &8pXkD#A  
   switch(wParam) Wk|z\OR(  
   { K$.zO4  
    case VK_MENU: wI4;/w>  
     MaskBits|=ALTBIT; ]/bE${W*]  
     break; 93J)9T  
    case VK_CONTROL: J4vKfxEg  
     MaskBits|=CTRLBIT; |rvrSab)  
     break; A!D:Kc3  
    case VK_SHIFT: -b$OHFL  
     MaskBits|=SHIFTBIT; [1*/lt|+p  
     break; |z'?3?,~  
    default: //judge the key and send message 2{CSH_"Z7  
     break; Wy4^mOv  
   } Ig<p(G.;}  
   for(int index=0;index<MAX_KEY;index++) Oe YLL4H  
   { Wa(S20y F  
    if(hCallWnd[index]==NULL)  SoX V  
     continue; w b[(_@eZ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =#tQIhX`  
    { @"!SU' *  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); `/zt&=`VB  
     bProcessed=TRUE; Dkb&/k:)  
    } 4I*Mc%dD  
   } ;N\?]{ L  
  } X2[cR;;'  
  if(!bProcessed){ C6w{"[Wv=X  
   for(int index=0;index<MAX_KEY;index++){ [S:)UvB  
    if(hCallWnd[index]==NULL) ? st#6=M  
     continue; J7GsNFL  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) b0X[x{k"  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); d mz3O(]$  
   } pG @iR*?  
  } ^rwSbM$  
 } ku?_/-ko]  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); d*$<%J  
} [MS.5+1Y  
2-0cB$W+  
BOOL InitHotkey() / yi:Q0  
{ W~3tQ!  
 if(hHook!=NULL){ Hz8`)cv`  
  nHookCount++; !h!9SE  
  return TRUE; ]5f M?:<l  
 } 5$U>M  
 else YSo7~^1W"  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); LFyceFbm  
  if(hHook!=NULL) ~ fEs!hl  
   nHookCount++; %wW5)Y I  
  return (hHook!=NULL); >UY_:cW4%m  
} 1fv~r@6s  
BOOL UnInit() L_"(A #H:  
{ f9UaAdJ(  
 if(nHookCount>1){ wG5RN;`V  
  nHookCount--; Ok&>[qu  
  return TRUE; cl{W]4*$  
 } b U]N^og^  
 BOOL unhooked = UnhookWindowsHookEx(hHook); r)(BT:2m  
 if(unhooked==TRUE){ ;Ia1L{472m  
  nHookCount=0; 2j7d$y*'  
  hHook=NULL; "GI&S%F  
 } b0Ov+ )7#  
 return unhooked; %D(prA_w  
} DXW?;|8)O  
_F@p53WE  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) PbUcbb17  
{ j9ta0~x1*6  
 BOOL bAdded=FALSE; 7&V^BW  
 for(int index=0;index<MAX_KEY;index++){ 4>VZk^%b#  
  if(hCallWnd[index]==0){ ~e77w\Q0  
   hCallWnd[index]=hWnd; otf%kG w  
   HotKey[index]=cKey; |8 2tw|<o  
   HotKeyMask[index]=cMask; z-G7Y#  
   bAdded=TRUE; :$i:8lz  
   KeyCount++; 1{x~iZa  
   break; |vN@2h(|"  
  } <nTmZ-;  
 } Xm:=jQn  
 return bAdded; <ytKf<a%e  
} Mp"ci+Iu  
S~Iw?SK3  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) D4Y!,7WEVt  
{ cJ##K/es  
 BOOL bRemoved=FALSE; &rztC]jF  
 for(int index=0;index<MAX_KEY;index++){ DJYXC,r  
  if(hCallWnd[index]==hWnd){ ?h)3S7  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ hLbT\J`I  
    hCallWnd[index]=NULL; 9LO.8Jy  
    HotKey[index]=0; e9@fQ  
    HotKeyMask[index]=0; O {6gNR,*  
    bRemoved=TRUE; _8b]o~[Z+  
    KeyCount--; >9<8G]vcH  
    break; E`uaE=Mdq  
   } ccn`f]5w  
  } fE%[j?[  
 } G:c8`*5Q  
 return bRemoved; M&djw`B  
} &O6;nJEI  
U++~3e@l  
void VerifyWindow() 8jjk?PUD8  
{ zz 'dg-F  
 for(int i=0;i<MAX_KEY;i++){ 40Qzo%eL  
  if(hCallWnd!=NULL){ oIvnF:c  
   if(!IsWindow(hCallWnd)){ W]D`f8r9  
    hCallWnd=NULL; Stw+Dm\!  
    HotKey=0; R8[i XXjku  
    HotKeyMask=0; ()C^ta_]  
    KeyCount--; A_jB|<bjTP  
   } X}j'L&{F@  
  } n `m_S  
 } 3W-NS~y  
} a\&(Ua  
Dl zmAN  
BOOL CHookApp::InitInstance() 7"n1it[RJ8  
{ 1 x\VdT  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ! [|vx!p  
 hins=AfxGetInstanceHandle(); #'4<> G]  
 InitHotkey(); yxCM l.  
 return CWinApp::InitInstance(); ci ,o8 [Y  
} N{^>MRK=5  
LZQFj/,Jg  
int CHookApp::ExitInstance() W"-EC`nP  
{ 53`9^|:  
 VerifyWindow(); 9xK4!~5V  
 UnInit(); D]pK=247  
 return CWinApp::ExitInstance(); Tw`c6^%^y  
} )&Kn (l)  
ayH%  qp  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 5:l*Ib:s7  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) of+phMev  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ I|F~HUzA"  
#if _MSC_VER > 1000 Ufaqhh  
#pragma once CRc!|?  
#endif // _MSC_VER > 1000 JA?,0S  
iM?I /\  
class CCaptureDlg : public CDialog |D;"D  
{ {{.sEi*  
 // Construction vJTfo#C|  
 public: Et}C`vZ+Ve  
  BOOL bTray; {+ C%D'  
  BOOL bRegistered; .7pGx*WH^Y  
  BOOL RegisterHotkey(); (>rS _#^  
  UCHAR cKey; V@#*``M,3  
  UCHAR cMask; <+? Y   
  void DeleteIcon(); *Z]5!$UpC  
  void AddIcon(); [GR]!\!%~  
  UINT nCount; W>` g;[ W  
  void SaveBmp(); W(uP`M%][0  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor aCU7w5  
  // Dialog Data \~gA+ o}Q  
  //{{AFX_DATA(CCaptureDlg) +  ZR(  
  enum { IDD = IDD_CAPTURE_DIALOG }; C.yY8?|  
  CComboBox m_Key; %aj7-K6:t  
  BOOL m_bControl; 85r)>aCMn  
  BOOL m_bAlt; +A8=R%&b)[  
  BOOL m_bShift; 8!u/   
  CString m_Path; ="3a%\  
  CString m_Number; !j!Z%]7  
  //}}AFX_DATA 6keP':bt  
  // ClassWizard generated virtual function overrides 9RG\UbX)^|  
  //{{AFX_VIRTUAL(CCaptureDlg) )l+XDI  
 public: *[d~Nk%Y$  
  virtual BOOL PreTranslateMessage(MSG* pMsg); <a8#0ojm  
 protected: [2GXAvXsT  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support -yX.Jv  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); >]Mq)V9  
  //}}AFX_VIRTUAL 2 ) TG  
  // Implementation fKL'/?LD]  
 protected: G$;>ueM  
  HICON m_hIcon; *.kj]BoO  
  // Generated message map functions *Rz{44LP&  
  //{{AFX_MSG(CCaptureDlg) D^66p8t  
  virtual BOOL OnInitDialog(); w1wXTt  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); {PN:bb  
  afx_msg void OnPaint(); ? .c?Pu  
  afx_msg HCURSOR OnQueryDragIcon(); gB(9vhj $  
  virtual void OnCancel(); H|PrsGW  
  afx_msg void OnAbout(); d^KBIz8$5l  
  afx_msg void OnBrowse(); wzD\8_;6N  
  afx_msg void OnChange(); Bz~ -2#l  
 //}}AFX_MSG b7,  
 DECLARE_MESSAGE_MAP() VDB$"T9#  
}; "DVt3E  
#endif xK$}QZ)  
kx|me~I  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file q<-%L1kc 1  
#include "stdafx.h" n=f`AmF;  
#include "Capture.h" 90Xt_$_}s  
#include "CaptureDlg.h" }Q/G &F  
#include <windowsx.h> :&Qb>PH[  
#pragma comment(lib,"hook.lib") NNwc!x)*  
#ifdef _DEBUG j.k@6[ R>?  
#define new DEBUG_NEW V-[2jC{  
#undef THIS_FILE ^4+r*YvcM  
static char THIS_FILE[] = __FILE__; Y{,2X~ 7  
#endif 5B}3GBA  
#define IDM_SHELL WM_USER+1 iPMB$SdfO  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ,/~[S  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 'b8R#R\P  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; j._G7z/LJ  
class CAboutDlg : public CDialog S*4f%!  
{ pp(H PKs=}  
 public: :FnOS<_B  
  CAboutDlg(); $v FrUv  
  // Dialog Data GA.BI"l  
  //{{AFX_DATA(CAboutDlg) 7nm}fT z7  
  enum { IDD = IDD_ABOUTBOX }; P?uf?{  
  //}}AFX_DATA smV!y8&  
  // ClassWizard generated virtual function overrides S2ark,sp6  
  //{{AFX_VIRTUAL(CAboutDlg) 1XG$ z@NN  
 protected: ?p(kh^z  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support mj)PLZ]  
  //}}AFX_VIRTUAL <lFdexH"T  
  // Implementation 8GY.){d!l  
 protected: pP3U,n   
  //{{AFX_MSG(CAboutDlg) KL "Y!PN:  
  //}}AFX_MSG !;i*\ a  
  DECLARE_MESSAGE_MAP() }xqXd%uz  
}; 4&|C}  
Z+0?yQ=%  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) QW2?n`Fa9-  
{ 7k `_#  
 //{{AFX_DATA_INIT(CAboutDlg) |H:<:*=6c  
 //}}AFX_DATA_INIT NW)M?f+6  
} 7UnzIe  
=qw &dwIQ  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) w}d}hI  
{ SWT:frki`  
 CDialog::DoDataExchange(pDX); !#.\QU|  
 //{{AFX_DATA_MAP(CAboutDlg) 3)y{n%3L  
 //}}AFX_DATA_MAP z4g+2f7h-X  
} D%A@lMru  
d4J<,  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 7ZQ'h3K  
 //{{AFX_MSG_MAP(CAboutDlg) ~^x-ym5  
 // No message handlers H"O$&  
 //}}AFX_MSG_MAP 85} ii{S  
END_MESSAGE_MAP() Z9xR  
u^l*5F%DK  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) va^0JfQ  
: CDialog(CCaptureDlg::IDD, pParent) h`lmC]X _  
{ H-Pq!9[DB  
 //{{AFX_DATA_INIT(CCaptureDlg) ;|6FdU  
  m_bControl = FALSE; XoJgs$3B  
  m_bAlt = FALSE; Yc d3QRB  
  m_bShift = FALSE; Ae6("Oid  
  m_Path = _T("c:\\"); qL3@PSN?|  
  m_Number = _T("0 picture captured."); bK<}0Ja[  
  nCount=0; -Un=T X  
  bRegistered=FALSE; EX4 C.C|d  
  bTray=FALSE; kQ~ %=pn  
 //}}AFX_DATA_INIT K@6`-|I  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 TMww  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Y#`Lcg+r,  
} V}SyD(8~  
Jh?z=JY  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) QF.3c6O@  
{ kxh 5}eB  
 CDialog::DoDataExchange(pDX); "7d.i(vw  
 //{{AFX_DATA_MAP(CCaptureDlg) S*g`d;8gV  
  DDX_Control(pDX, IDC_KEY, m_Key); .EG* +,  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); /$Z m~Mp  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 2m\m/O  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); gfm;xT/y  
  DDX_Text(pDX, IDC_PATH, m_Path); {y b D  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ;R!*I%  
 //}}AFX_DATA_MAP 5q Rc4d'  
} tOM(U-7Z&  
>t0%?wj)Y  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) qOi5WX6F/  
//{{AFX_MSG_MAP(CCaptureDlg) waCboK'  
 ON_WM_SYSCOMMAND() sMm/4AY]  
 ON_WM_PAINT() ZBJ3VK  
 ON_WM_QUERYDRAGICON() t:=k)B  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) H|`R4hAk  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) KmL$M  
 ON_BN_CLICKED(ID_CHANGE, OnChange) f>z`i\1oO  
//}}AFX_MSG_MAP zKxvN3!  
END_MESSAGE_MAP() z,x" a  
@!<d0_dnC  
BOOL CCaptureDlg::OnInitDialog() YjLe(+ WQ  
{ U CRAw3=  
 CDialog::OnInitDialog(); Sdx Y>;  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); SX+4 HJB  
 ASSERT(IDM_ABOUTBOX < 0xF000); Gs_qO)~xo  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ;v_V+t <$  
 if (pSysMenu != NULL) |l7%l&!  
 { ?/'}JS(Sm  
  CString strAboutMenu; xnbsg!`;7W  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 5m7b\Mak  
  if (!strAboutMenu.IsEmpty()) xGRT"U(  
  { VNj@5s  
   pSysMenu->AppendMenu(MF_SEPARATOR); 9cfR)*Q  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 6IP$n($2  
  } h!e2 +4{4{  
 } 2xn<E>]  
 SetIcon(m_hIcon, TRUE); // Set big icon G52Z)^  
 SetIcon(m_hIcon, FALSE); // Set small icon K%gP5>y*9>  
 m_Key.SetCurSel(0); X V=S )  
 RegisterHotkey(); 8bOT*^b$H  
 CMenu* pMenu=GetSystemMenu(FALSE); V7C1FV2  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); iCrxV{   
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); s<&[\U  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); FZXyfZw!|  
 return TRUE; // return TRUE unless you set the focus to a control >'`Sf ?+|  
} *Hs*,}MS  
>vujZw_0>  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) O-PdM`mqW  
{ TnA?u (R%  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) \A<v=VM|  
 { `*yAiv>  
  CAboutDlg dlgAbout; g1 9S  
  dlgAbout.DoModal(); ia4k:\  
 } 9&K/GaG  
 else ZJ(rG((!  
 { (A{NF(   
  CDialog::OnSysCommand(nID, lParam); eN/G i<  
 } c!Dc8=nE0m  
} ~HmxEk9  
OCnFEX"  
void CCaptureDlg::OnPaint() PLdn#S}.  
{ jPk c3dG +  
 if (IsIconic()) ~Ltr.ci  
 { +xj "hX>3  
  CPaintDC dc(this); // device context for painting =_PvrB2'  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Y"!uU.=xJ  
  // Center icon in client rectangle V=}1[^  
  int cxIcon = GetSystemMetrics(SM_CXICON); XP?*=Z]  
  int cyIcon = GetSystemMetrics(SM_CYICON); Ld(NhB'7  
  CRect rect; t1ze-Ht;  
  GetClientRect(&rect); S LGW:  
  int x = (rect.Width() - cxIcon + 1) / 2; Sj-[%D*  
  int y = (rect.Height() - cyIcon + 1) / 2; SRL-Z&M  
  // Draw the icon fbC~WV#  
  dc.DrawIcon(x, y, m_hIcon); <>=mCZ2  
 } 6I|A- h  
 else =;{^" #r\  
 { HY)ESU !  
  CDialog::OnPaint(); oT&m4I  
 } 'Kz9ygZy  
} H}nJbnU  
X:=c5*0e  
HCURSOR CCaptureDlg::OnQueryDragIcon() q`Q}yE> 9  
{ n?E}b$6  
 return (HCURSOR) m_hIcon; FifbxL  
} uGCp#>+  
saW!9HQj  
void CCaptureDlg::OnCancel() k+1gQru{d  
{ kuKa8c  
 if(bTray) u~F~cDu  
  DeleteIcon(); qLjT.7 .x  
  CDialog::OnCancel(); w sY}JT  
} >ttuum12w  
AK2WN#u@Z  
void CCaptureDlg::OnAbout() K)[8 H~Lm  
{ #a,9B-X  
 CAboutDlg dlg; nPA@h  
 dlg.DoModal(); Q_O*oT(0  
} DDw''  
Ty+I8e]{  
void CCaptureDlg::OnBrowse() MYdx .NZT  
{ g1|w?pI1  
 CString str; N.hzKq][  
 BROWSEINFO bi; DWf$X1M  
 char name[MAX_PATH]; YYUe)j{T  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); <z)E (J\  
 bi.hwndOwner=GetSafeHwnd(); >Ko[Xb-8^_  
 bi.pszDisplayName=name; $sgH'/>  
 bi.lpszTitle="Select folder"; ngyY  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; "2hh-L7ql  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); rK|*hcy  
 if(idl==NULL) Ceg!w#8Z,  
  return; +>YfRqz:KB  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); lhPGE_\  
 str.ReleaseBuffer(); `&*bM0(J  
 m_Path=str; PC/!9s 0W  
 if(str.GetAt(str.GetLength()-1)!='\\') Kf.T\V4%  
  m_Path+="\\"; 5 Op_*N{V  
 UpdateData(FALSE); MCYl{uH!  
} 3-x%wD.  
`9 [i79U  
void CCaptureDlg::SaveBmp() M{KW@7j  
{ wahZK~,EaY  
 CDC dc; 9l !S9d  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ][:rLs  
 CBitmap bm; 8^ #mvHah  
 int Width=GetSystemMetrics(SM_CXSCREEN); J@#?@0]F  
 int Height=GetSystemMetrics(SM_CYSCREEN); ]WL|~mG  
 bm.CreateCompatibleBitmap(&dc,Width,Height); z<n-Gzwk  
 CDC tdc; A 's-'8m  
 tdc.CreateCompatibleDC(&dc); 3 ^}A %-bS  
 CBitmap*pOld=tdc.SelectObject(&bm); m<@z}%v-  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); /A07s[L  
 tdc.SelectObject(pOld); m5-9yQ=.  
 BITMAP btm; Qv{,wytyO  
 bm.GetBitmap(&btm); %ROwr[Dj=  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; xRxy|x[  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); g9>~HF$U  
 BITMAPINFOHEADER bih; ZGz|m0b (  
 bih.biBitCount=btm.bmBitsPixel; (S9f/i ^  
 bih.biClrImportant=0; ,XB%\[pKe  
 bih.biClrUsed=0; jk7 0u[\  
 bih.biCompression=0; "wM1qX  
 bih.biHeight=btm.bmHeight; ct n, ]ld  
 bih.biPlanes=1; GyC)EFd  
 bih.biSize=sizeof(BITMAPINFOHEADER); 2wlKBSON  
 bih.biSizeImage=size; ,8VU&?`<}  
 bih.biWidth=btm.bmWidth; <nzN$"%  
 bih.biXPelsPerMeter=0; 6 /Y1 wu  
 bih.biYPelsPerMeter=0; G|4^_`-  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 658^"]Rk'/  
 static int filecount=0; r>|-2}{N/  
 CString name; D>#l-{d  
 name.Format("pict%04d.bmp",filecount++); 1}g:|Q  
 name=m_Path+name; p 2 !FcFi  
 BITMAPFILEHEADER bfh; ,=PKd&  
 bfh.bfReserved1=bfh.bfReserved2=0; kiUk4&1  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 9M-K]0S(  
 bfh.bfSize=54+size; a.kbov(  
 bfh.bfOffBits=54; `f`TS#V  
 CFile bf; 2QUx&u:  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 97`WMs  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); pv# 2]v  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); x` /)g(  
  bf.WriteHuge(lpData,size); j]5WK_~M  
  bf.Close(); g8pO Lr'  
  nCount++; S4A q'  
 } PkUd~c  
 GlobalFreePtr(lpData); uA~slS Z  
 if(nCount==1) K4 %/!`  
  m_Number.Format("%d picture captured.",nCount); r`M6!}oa  
 else +4)7j&L  
  m_Number.Format("%d pictures captured.",nCount); zG9|K  
  UpdateData(FALSE); ~[W#/kd1n  
} k$"d^*R  
b{cU<;G)y.  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ~~qWI>. 4  
{ W!la-n  
 if(pMsg -> message == WM_KEYDOWN) }nrXxfu  
 { FN87^.^2S  
  if(pMsg -> wParam == VK_ESCAPE) mG2'Y)Sz  
   return TRUE; W>-B [5O&[  
  if(pMsg -> wParam == VK_RETURN) 0^l%j8/  
   return TRUE; fi%r<]@  
 } FxW&8 9G  
 return CDialog::PreTranslateMessage(pMsg); *3+-W  
} ZxHJ<2oD  
ukAKFc^)k  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 1{PG>W  
{ gS9>N/b|  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Z~u9VYi!  
  SaveBmp(); q31>uF  
  return FALSE; 4< S'  
} M {a #  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ _GA$6#]  
 CMenu pop; j,-C{ K  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); tw K^I6@  
 CMenu*pMenu=pop.GetSubMenu(0); m#5_%3T  
 pMenu->SetDefaultItem(ID_EXITICON); "lVqU  
 CPoint pt; ${r[!0|   
 GetCursorPos(&pt); 7&%^>PU7  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ff2d @P,!  
 if(id==ID_EXITICON) xyeA  2Y  
  DeleteIcon(); lxb zHlX  
 else if(id==ID_EXIT) )e%}b -I'r  
  OnCancel(); AR&:Q4r|  
 return FALSE; DSyXr~p8  
} x_<qzlQt  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); U~f4e7x*O  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) !!,0'c  
 AddIcon(); L'A)6^d@S  
 return res; dF@)M  
} S]>wc yy=n  
J7$_VP  
void CCaptureDlg::AddIcon() 4[2_,9}  
{ [xlIG}e9  
 NOTIFYICONDATA data; b{Zpux+  
 data.cbSize=sizeof(NOTIFYICONDATA); WI[:-cv  
 CString tip; 2W<n5o   
 tip.LoadString(IDS_ICONTIP); DDd/DAkCX  
 data.hIcon=GetIcon(0); 5f7zk  
 data.hWnd=GetSafeHwnd(); z~oDWANP  
 strcpy(data.szTip,tip); q!lP"J  
 data.uCallbackMessage=IDM_SHELL; \Sy7 "a  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; *VeW?mY,P  
 data.uID=98; JMa3btLy(  
 Shell_NotifyIcon(NIM_ADD,&data); E1V^}dn  
 ShowWindow(SW_HIDE); Mt>oI SN&d  
 bTray=TRUE; c0- ;VZ'  
} l|`^*%W@u6  
9";sMB}W*  
void CCaptureDlg::DeleteIcon() Hh[Tw&J4  
{ [0;buVU.  
 NOTIFYICONDATA data; [AzO:A  
 data.cbSize=sizeof(NOTIFYICONDATA); a:rX9-**  
 data.hWnd=GetSafeHwnd(); Kx`/\u=/  
 data.uID=98; S33j?+ Vs  
 Shell_NotifyIcon(NIM_DELETE,&data); /BA{O&Ro^  
 ShowWindow(SW_SHOW); TpfZ>d2  
 SetForegroundWindow(); |`O5Xs1{B  
 ShowWindow(SW_SHOWNORMAL); b~Y%gC)FR  
 bTray=FALSE; ,J =P,](  
} |L3X_Me  
`#s#it'y  
void CCaptureDlg::OnChange() I[Ic$ta  
{ !X^Ce)1K  
 RegisterHotkey(); n(ir[w#,]"  
} :<S<f%  
)r6EW`$  
BOOL CCaptureDlg::RegisterHotkey() ~f>2U]F>5  
{ s|yVAt|=  
 UpdateData(); wTq{sW&  
 UCHAR mask=0; 8F5|EpB9M  
 UCHAR key=0; 47By`Jh71  
 if(m_bControl) s'HD{W`  
  mask|=4; n%%7KTqu  
 if(m_bAlt)  Gs0H@  
  mask|=2; \.{AAj^qD  
 if(m_bShift) 7 h=QW5  
  mask|=1; N;sm*+r  
  key=Key_Table[m_Key.GetCurSel()]; wEft4 o  
 if(bRegistered){ o @Z#  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ]1`g^Z@ 0  
  bRegistered=FALSE; fL*T3[d  
 } f>9s!Hpu_  
 cMask=mask; vv0Q$ O->  
 cKey=key; wVl+]zB  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); b0<o  
 return bRegistered; W#w.h33)#6  
} F3U`ueP  
Fzq41jiS  
  四、小结 qi[Z,&  
kQ>^->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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