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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: kp<Au)u  
  ,]:< l  
  一、实现方法 ,tg]Gt  
F!u)8>s+z{  
  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: |nnFjGC`~  
UF-'(  
#pragma data_seg("shareddata") PI`Y%!P  
HHOOK hHook =NULL; //钩子句柄 _b-g^#L%  
UINT nHookCount =0; //挂接的程序数目 eZ[Qhrc  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 r2'K'?T3  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 w@Q~ax/  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey l1]{r2g  
static int KeyCount =0; <\Y(+?+uZ  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 41Q)w=hoN  
#pragma data_seg() hHVAN3e  
\$DBtq5=  
  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。 71P. 9Iz  
KA{QGaZ/  
  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: wXqwb|2  
IZLCwaW  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR /.!&d^  
cKey,UCHAR cMask) ILH[q>  
{  WTl0}wi  
 BOOL bAdded=FALSE; e],(d7Jo  
 for(int index=0;index<MAX_KEY;index++){ sn^ 3xAF  
  if(hCallWnd[index]==0){ =1R 2`H\  
   hCallWnd[index]=hWnd; 2 YWO'PL  
   HotKey[index]=cKey; >yT1oD0+x  
   HotKeyMask[index]=cMask; }wv Rs5;o  
   bAdded=TRUE; g4Dck4^!4  
   KeyCount++; H*3u]Ebh  
   break; -UzWLVB^  
  } mr G?5.7W  
 } DO*6gzW  
 return bAdded; 1pDU}rPJ.  
} *dBmb  
//删除热键 y&8`NS#_p?  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) }93FWo.  
{ +,ar`:x&a  
 BOOL bRemoved=FALSE; d#bg(y\G|  
 for(int index=0;index<MAX_KEY;index++){ S[/udA   
  if(hCallWnd[index]==hWnd){ h@ ZC{B  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ *& );-r`.  
    hCallWnd[index]=NULL; mdrqX<x'~  
    HotKey[index]=0; i(.PkYkaq  
    HotKeyMask[index]=0; S\t!7Xs%*U  
    bRemoved=TRUE; e<`?$tZ3   
    KeyCount--; !J<0.nO/:  
    break; tq'hiS(b  
   } (]I=';\  
  } r<srTHGL o  
 } s/11 TgJ  
 return bRemoved; <GQ=PrT|/  
} G^K;+&T  
=1|p$@L`%  
0~W XA=XG  
  DLL中的钩子函数如下: Q7v1xBM  
_G<Wq`0w)  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) `uusUw-Gf  
{ 1?8M31  
 BOOL bProcessed=FALSE; y ,`0f|  
 if(HC_ACTION==nCode) T7/DH  
 { y<R5}F  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 5i'?oXL  
   switch(wParam) Oz]$zRu/0  
   {  LqJV  
    case VK_MENU: 7AGUi+!ICl  
     MaskBits&=~ALTBIT; gC kR$.-E  
     break; !m'Rp~t  
    case VK_CONTROL: Y@MxKKuj  
     MaskBits&=~CTRLBIT; UEYJd&n0CB  
     break; ""N~##)8  
    case VK_SHIFT: |{ZdAr.;  
     MaskBits&=~SHIFTBIT; FoZI0p?L)9  
     break; c`lL&*]  
    default: //judge the key and send message Z]k@pR !  
     break; RK$(  
   } Rd]<591  
   for(int index=0;index<MAX_KEY;index++){ Sz1J4$5  
    if(hCallWnd[index]==NULL) B^R44j]3"  
     continue; YG0b*QBY~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) K g.O2F77  
    { w6Mv%ZO_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); TPKD'@:x  
     bProcessed=TRUE; l)jP!k   
    } {36N=A  
   } D ZH2U+K  
  } JlRNJ#h>  
  else if((lParam&0xc000ffff)==1){ //有键按下 {KEmGHC4R  
   switch(wParam) F1M:"-bda  
   { zq?xY`E  
    case VK_MENU: cdSgb3B0  
     MaskBits|=ALTBIT; [[';Hi^  
     break; A>FWvlLw'm  
    case VK_CONTROL: r/P}j4)b7  
     MaskBits|=CTRLBIT; 7<B-2g  
     break; %AWc`D  
    case VK_SHIFT: (#z6w#CU(  
     MaskBits|=SHIFTBIT; "i*gJFW|  
     break; #!#s7^%K&  
    default: //judge the key and send message 0XqxW\8_l  
     break; %yl17:h#  
   } SdnO#J}{  
   for(int index=0;index<MAX_KEY;index++){ $ O[Y  
    if(hCallWnd[index]==NULL) "oF)u1_?  
     continue; Ra H1aS(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !<~cjgdx  
    { jPZpJ:  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); w $`w  
     bProcessed=TRUE; ga S}>?qk  
    } /Ah&d@b  
   } x5/&,&m`%  
  } rQU6*f  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 '4Qsl~[Eh  
   for(int index=0;index<MAX_KEY;index++){ `QW=<Le?  
    if(hCallWnd[index]==NULL) YB2gxZ  
     continue; gA@Zx%0j  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) T"gk^.  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); =1,1}OucP  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 %&V%=-O_7  
   } &CN(PZv  
  } uaU2D-ft"  
 } K1]3zLnS  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); jcBZ#|B7;  
} o[+t}hC[  
MHye!T6fO\  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: . sFN[>)  
~#}T|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ~(GN Y5  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); v7`{6Pf_$  
jF/S2Ty2  
  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: !=a]Awr\  
~<s =yjTu+  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) G'(rjH>q  
{ 9 Qa_3+.B  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) <1<xSr  
 { 7\R"RH-  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 NuD|%Ebs  
  SaveBmp(); fBv: TC%  
  return FALSE; |d*a~T0  
 } N#t`ZC&m'  
 …… //其它处理及默认处理 woBx609Aak  
} >V)"TZH  
JEMc_ngR!  
|5X[/Q*K`W  
  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。 mZPvG  
(j??  
  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。 a'dlA da  
DZ\K7-  
  二、编程步骤 h0g?=hJq  
4K? \5(b  
  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"; =+ >>l0=_v  
.jk A'i@  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; TO"Md["GI  
N fG9a~  
  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)K er  
  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; 9:-7.^`P  
zp<B,Ls  
  5、 添加代码,编译运行程序。 voN~f>  
ZILJXX4  
三、程序代码 !Hl]&  
5Pn.c!  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Ef28  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) qq)}GK8K&  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ &r4|WM/ec  
#if _MSC_VER > 1000 vB{i w}Hi!  
#pragma once @p WN5VL  
#endif // _MSC_VER > 1000 )Se$N6u-  
#ifndef __AFXWIN_H__ cy;i1#1rO  
#error include 'stdafx.h' before including this file for PCH uW=G1 *n-  
#endif ] S[?tn  
#include "resource.h" // main symbols -`* 'p i  
class CHookApp : public CWinApp f(~N+2}  
{ wL="p) TO.  
 public: Mb 4"bDBsl  
  CHookApp(); vIOGDI>  
  // Overrides =&$z Nc4h  
  // ClassWizard generated virtual function overrides @*Ry`)T  
  //{{AFX_VIRTUAL(CHookApp) gK({InOP  
 public: }^&f {   
  virtual BOOL InitInstance(); m:[I$b6AY  
  virtual int ExitInstance(); 5:f!EMb  
  //}}AFX_VIRTUAL Zp~yemERr  
  //{{AFX_MSG(CHookApp) mY4pvpZw8  
  // NOTE - the ClassWizard will add and remove member functions here. Q+9:]Bt  
  // DO NOT EDIT what you see in these blocks of generated code ! 2[qfF6FHA  
  //}}AFX_MSG 5}ftiy[Yc  
  DECLARE_MESSAGE_MAP() o9"?z  
}; DR}I+<*%aD  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); &|#[.ti1  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Y'i yfnk  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 52tc|j6~#  
BOOL InitHotkey(); ; /K6U  
BOOL UnInit(); j7kX"nz  
#endif C:5- h(#  
,mp<<%{u  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 7` ;sX?R  
#include "stdafx.h" Qa )+Tv  
#include "hook.h" C`g "Mk8  
#include <windowsx.h> n2B%}LLa  
#ifdef _DEBUG :1j8!R5  
#define new DEBUG_NEW %N<5ST>(  
#undef THIS_FILE 208^Yu  
static char THIS_FILE[] = __FILE__;  c2M  
#endif kP&I}RY  
#define MAX_KEY 100 &3Zb?  
#define CTRLBIT 0x04 pS ](Emn`.  
#define ALTBIT 0x02 VbvP!<8  
#define SHIFTBIT 0x01 .c+U=bV-  
#pragma data_seg("shareddata") N knS:r&2  
HHOOK hHook =NULL; )0exGx+:  
UINT nHookCount =0; O?Bf (y  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey {k_\1t(/  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ?IHt T3'Rt  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey g&xj(SMj-$  
static int KeyCount =0; w8 :[w  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift *O~y6|U?  
#pragma data_seg() )4=86>XJT  
HINSTANCE hins; `z(o01y  
void VerifyWindow(); .))j R:{3  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) =6Ok4Z  
//{{AFX_MSG_MAP(CHookApp) IRm}?hHf  
// NOTE - the ClassWizard will add and remove mapping macros here. Q /4-7  
// DO NOT EDIT what you see in these blocks of generated code! l[$GOLeS  
//}}AFX_MSG_MAP uS`}  
END_MESSAGE_MAP() < bC'.m  
2j%=o?me^p  
CHookApp::CHookApp() -a)1L'R  
{ FprdP*/  
 // TODO: add construction code here, zK5&,/  
 // Place all significant initialization in InitInstance 1DB{"8ov  
} iN Oj @3x  
O3o ^%0  
CHookApp theApp; Ow/,pC >V  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) (`dz3 7@*  
{ ),p0V  
 BOOL bProcessed=FALSE; 3O2G+G2  
 if(HC_ACTION==nCode) ~ps,U  
 { O] PM L`  
  if((lParam&0xc0000000)==0xc0000000){// Key up >SDQ@63E?  
   switch(wParam) toPbFU'  
   { 5VTVx1P[8  
    case VK_MENU: :1*E5pX0n  
     MaskBits&=~ALTBIT; 'Eur[~k  
     break; >whv*@Fr  
    case VK_CONTROL: Sxq@W8W  
     MaskBits&=~CTRLBIT; ]%A> swCpn  
     break; xkDK5&V  
    case VK_SHIFT: "KP]3EyPc  
     MaskBits&=~SHIFTBIT; 6NX#=A  
     break; lwf4ke  
    default: //judge the key and send message DSwb8q  
     break; ~Q_7HJ=^$  
   } ^yPZ$Q  
   for(int index=0;index<MAX_KEY;index++){ ?2&= +QaT  
    if(hCallWnd[index]==NULL) OWewV@VXR  
     continue; 3Qe|'E,U  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;-VZVp}Y  
    { b~vV++ou_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 1jd{AqHl  
     bProcessed=TRUE; \+V"JIStUj  
    } ar<8wq<4G  
   } csW\Q][  
  } &qS%~h%2  
  else if((lParam&0xc000ffff)==1){ //Key down I #1~CbR  
   switch(wParam) i=#`7pt%'a  
   { T>asH  
    case VK_MENU: LXo$\~M8G8  
     MaskBits|=ALTBIT; G"?7 Z&+  
     break; @\&j3A  
    case VK_CONTROL: CnB[ImMs(A  
     MaskBits|=CTRLBIT; N-upNuv  
     break; qhY+<S9  
    case VK_SHIFT: l }/_(*  
     MaskBits|=SHIFTBIT; !=:>yWQ  
     break; M]PZwW8  
    default: //judge the key and send message 1k6asz^T  
     break; 1]:,Xa+|S  
   } u&I c  
   for(int index=0;index<MAX_KEY;index++) %8n<#0v-|4  
   { t?>}0\1  
    if(hCallWnd[index]==NULL) :o!Kz`J  
     continue; MOQ6&C`7q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) B9NUafK=  
    { 6#U~>r/  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 67rY+u%  
     bProcessed=TRUE; <CVX[R]U  
    } mvjx &+q  
   } bpBn3f`?*  
  } ( 3B1X  
  if(!bProcessed){ eWDXV-xD  
   for(int index=0;index<MAX_KEY;index++){ ^}~Q(ji7  
    if(hCallWnd[index]==NULL) 7N 0Bj!  
     continue; x >ah,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) q#3T L<  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 8j>V?'Szk  
   } @FIL4sb  
  } :'bZ:J>f  
 } d=bK NA90  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); :Ob4WU  
} b~&cYk'  
"J,|),Yd  
BOOL InitHotkey() 9R$$(zB 1;  
{ UUfM 7gq  
 if(hHook!=NULL){ !LH;K  
  nHookCount++; 7=N%$]DKZ  
  return TRUE; c{Z "'t7  
 } nX:E(9q7c  
 else E?+~S M1~  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); B`QF;,3S  
  if(hHook!=NULL) =iW hK~S  
   nHookCount++; sP^:*B0  
  return (hHook!=NULL); dsw^$R}   
} =* 'yGB[x)  
BOOL UnInit() g"n>v c7  
{ 0Lj;t/mG  
 if(nHookCount>1){ ?:/J8s [O  
  nHookCount--; ?&0CEfa?  
  return TRUE; vfqXHc unj  
 } 8*8Y\"  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 2#$7!`6 K  
 if(unhooked==TRUE){ KLM6#6`  
  nHookCount=0; ;sA 5&a>!  
  hHook=NULL; mH;t)dT  
 } 7|=SZ+g  
 return unhooked; HAE$Np|>a  
} l1zPL3"u_^  
G$YF0Nc  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 4;~xRg;u&*  
{ @;9KP6d  
 BOOL bAdded=FALSE; ;PMPXN'z6  
 for(int index=0;index<MAX_KEY;index++){ @8J*vY =e  
  if(hCallWnd[index]==0){ Q-h< av9  
   hCallWnd[index]=hWnd; 9u=]D> kb  
   HotKey[index]=cKey; R|Bi%q|4P  
   HotKeyMask[index]=cMask; /b{@']  
   bAdded=TRUE; nZj&Ma7R  
   KeyCount++; Kc] GE#~g  
   break; *RJD^hu  
  } 9r\p4_V  
 } 6@0? ~  
 return bAdded; )5`^@zx  
} q) 5s'(  
uUaDesz~=  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) }6u}?>S  
{ D {E,XOi  
 BOOL bRemoved=FALSE; }:?_/$};  
 for(int index=0;index<MAX_KEY;index++){ .gNJY7`b  
  if(hCallWnd[index]==hWnd){ %QDAog  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Yc[vH=gV}  
    hCallWnd[index]=NULL; ve/.q^JeJ  
    HotKey[index]=0; 'yOx&~H]  
    HotKeyMask[index]=0; MYJDfI  
    bRemoved=TRUE; A\/DAVnI  
    KeyCount--; <!W9E M  
    break; @B+8' b$9  
   } \ Ho VS  
  } aQWg?,Ju6  
 } yYJ +vs  
 return bRemoved; +A 6kw%"  
} L eUp!  
OpOR!  
void VerifyWindow() z5^Se!`5  
{ V-%jSe<  
 for(int i=0;i<MAX_KEY;i++){ l0!`>Xx[b  
  if(hCallWnd!=NULL){ :d<F7`k H  
   if(!IsWindow(hCallWnd)){ ayf;'1  
    hCallWnd=NULL; w &^Dbme  
    HotKey=0; #B$_ily)  
    HotKeyMask=0; d8jP@>  
    KeyCount--; #R= 6$  
   } 0a$hK9BH  
  } Em<J{`k6  
 } L@ N\8mf  
} 8 =3#S'n  
QUdF`_U7  
BOOL CHookApp::InitInstance() (a|Wq{`[  
{ AdF[>Wv  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 7&dPrnQX=  
 hins=AfxGetInstanceHandle(); :;3y^!  
 InitHotkey(); 6~Zq  
 return CWinApp::InitInstance(); Y,%G5X@S<  
} wqn }t]  
}PzYt~Z`@  
int CHookApp::ExitInstance() N;av  
{ BjUz"69  
 VerifyWindow(); }'TZ)=t{J  
 UnInit(); 75H5{#)  
 return CWinApp::ExitInstance(); ZnB|vfL?  
} WB|SXto%4D  
h,Tsb:Q"M  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file c:`&QDF  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) u/ 74E0$S  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ TCO^9RP<  
#if _MSC_VER > 1000 OY#=s!] M  
#pragma once WXE{uGc  
#endif // _MSC_VER > 1000 aSNTm8SYX  
Y'i_EX|  
class CCaptureDlg : public CDialog )e:u 6]  
{ 3Q(#2tL=  
 // Construction 9L xa?Y1  
 public: }3mIj<I1;  
  BOOL bTray; :~]ha  
  BOOL bRegistered; ur`:wR] 2?  
  BOOL RegisterHotkey(); 1=%\4\  
  UCHAR cKey; lo!_;`v=U  
  UCHAR cMask; f qU*y 6]  
  void DeleteIcon(); '=vD!6=0@  
  void AddIcon(); [L@ vC>G  
  UINT nCount; sHulaX{  
  void SaveBmp(); t@EHhiBz  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 7w{>bYP  
  // Dialog Data x+7jJ=F  
  //{{AFX_DATA(CCaptureDlg) W.u}Q@  
  enum { IDD = IDD_CAPTURE_DIALOG }; ;M"JN:J8  
  CComboBox m_Key; GoNX\^A  
  BOOL m_bControl; _(s|@UT#  
  BOOL m_bAlt; &iDX+*(  
  BOOL m_bShift; Am? dHP  
  CString m_Path; Yl#r9TM  
  CString m_Number;  Ju#t^P  
  //}}AFX_DATA z@3t>k|K  
  // ClassWizard generated virtual function overrides LCRZ<?O[|  
  //{{AFX_VIRTUAL(CCaptureDlg) /"$;3n~  
 public: 14p <0BG  
  virtual BOOL PreTranslateMessage(MSG* pMsg); .W<yiB}^  
 protected: ZVj/lOP X  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support q8{) 27f,  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); N%\!eHxy  
  //}}AFX_VIRTUAL L}1|R*b  
  // Implementation "-+5`!Y  
 protected: x 2\ ,n  
  HICON m_hIcon; tTB,eR$  
  // Generated message map functions 4jl UyAD  
  //{{AFX_MSG(CCaptureDlg) I=)u:l c  
  virtual BOOL OnInitDialog(); lV-b   
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); J?~El&  
  afx_msg void OnPaint(); ?[}r& f  
  afx_msg HCURSOR OnQueryDragIcon(); MV<2x7S  
  virtual void OnCancel(); >'^Tp7\  
  afx_msg void OnAbout(); %(IkUD  
  afx_msg void OnBrowse(); B'OUT2cgB  
  afx_msg void OnChange(); +wU9d8W  
 //}}AFX_MSG >weY_%a  
 DECLARE_MESSAGE_MAP() m?]X NgT  
}; RjY(MSc  
#endif ) N*,cTE  
o.ntzN  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file dC$z q~q  
#include "stdafx.h" E({W`b~_f  
#include "Capture.h" iX]Vkx  
#include "CaptureDlg.h" :d v{'O  
#include <windowsx.h> B zmmE2~*  
#pragma comment(lib,"hook.lib") a7+w)]r  
#ifdef _DEBUG bhqBFiuhH  
#define new DEBUG_NEW 0drt,k  
#undef THIS_FILE Em?Z  
static char THIS_FILE[] = __FILE__; 5\MCk"R!  
#endif WdEVT,jjh  
#define IDM_SHELL WM_USER+1 9?5'>WO  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); j\kT H  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); i^9,.$<1  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; K( : NshM  
class CAboutDlg : public CDialog uURm6mVt9:  
{ % ~eIx=s  
 public: I8R#EM%C#  
  CAboutDlg(); 'aYUF&GG  
  // Dialog Data -][~_Hd{  
  //{{AFX_DATA(CAboutDlg) .E H&GX  
  enum { IDD = IDD_ABOUTBOX }; v?Z30?_&h  
  //}}AFX_DATA km@V|"ac _  
  // ClassWizard generated virtual function overrides ^U"$uJz!c  
  //{{AFX_VIRTUAL(CAboutDlg) z'=8U@P'#  
 protected: b.mcP@  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support !&'GWQY{(  
  //}}AFX_VIRTUAL . V5Pr}"y  
  // Implementation 0,b.;r  
 protected: aQjs5RbP~  
  //{{AFX_MSG(CAboutDlg) #0HZ"n  
  //}}AFX_MSG `fTH"l1zn  
  DECLARE_MESSAGE_MAP() w ]8+ OP  
}; ]Sj<1tx7f  
H( L.k;B  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ,z4)A&F[c;  
{ k }amSsE  
 //{{AFX_DATA_INIT(CAboutDlg) 9:DT+^BB  
 //}}AFX_DATA_INIT WP5cC@x  
} y vIeK6  
'e&L53n  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 0d>|2QV   
{ -!o*A>N  
 CDialog::DoDataExchange(pDX); s#Os?Q?  
 //{{AFX_DATA_MAP(CAboutDlg) O0Z !*Hy  
 //}}AFX_DATA_MAP !4.VK-a9V%  
} qQ&=Z` p!  
6 zyxGJ(  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) v11Uw?CM  
 //{{AFX_MSG_MAP(CAboutDlg) |Y-{)5/5}  
 // No message handlers W;Y"J_  
 //}}AFX_MSG_MAP O)N$nBnp  
END_MESSAGE_MAP() 7)RDu,fx  
$ jkzm8{W  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) .ZOG,h+8  
: CDialog(CCaptureDlg::IDD, pParent) .-Z=Aa>  
{ NqlU?  
 //{{AFX_DATA_INIT(CCaptureDlg) :9H`O!VF  
  m_bControl = FALSE; *x!j:/S`n  
  m_bAlt = FALSE; ,=a+;D]'  
  m_bShift = FALSE; AU$<W"%R  
  m_Path = _T("c:\\"); C.|.0^5  
  m_Number = _T("0 picture captured."); m|uVmg!*  
  nCount=0; yac4\%ze  
  bRegistered=FALSE; *P01 yW0  
  bTray=FALSE; A!$;pwn0  
 //}}AFX_DATA_INIT W{$J)iQ  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 xcQD]"   
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); R@df~  
} m$.7) 24  
+B '<0  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) /Moyn"Kj{  
{ 9GX'+$R]  
 CDialog::DoDataExchange(pDX); >6KwZr BB  
 //{{AFX_DATA_MAP(CCaptureDlg) Y=?Tm,z4  
  DDX_Control(pDX, IDC_KEY, m_Key); NwcRH9};i  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); H2S/!Q;K  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Vl^p3f[  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); u0Bz]Ux/Q  
  DDX_Text(pDX, IDC_PATH, m_Path); )%JjV(:  
  DDX_Text(pDX, IDC_NUMBER, m_Number); @ N@ !Q  
 //}}AFX_DATA_MAP eemC;JV%  
} ms&6N']  
*DgRF/S  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) {^.q6,l  
//{{AFX_MSG_MAP(CCaptureDlg) \IhHbcF`d  
 ON_WM_SYSCOMMAND() "]bOpk T  
 ON_WM_PAINT() `l'Ine 11  
 ON_WM_QUERYDRAGICON() E{'Y>g B6  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) j.yh>"de  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) s-4qK(ml-  
 ON_BN_CLICKED(ID_CHANGE, OnChange) yR% l[/ X  
//}}AFX_MSG_MAP _oHxpeM  
END_MESSAGE_MAP() D4T42L  
Nh01NY;  
BOOL CCaptureDlg::OnInitDialog() *&z !y/  
{ k5|GN Y6a  
 CDialog::OnInitDialog(); )+Yu7=S  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); @8Cja.H  
 ASSERT(IDM_ABOUTBOX < 0xF000); Mn 8| K nh  
 CMenu* pSysMenu = GetSystemMenu(FALSE); x21XzGLY|}  
 if (pSysMenu != NULL) k]9y+WC2  
 { !ir%Pz ^)  
  CString strAboutMenu; ;> %wf3e  
  strAboutMenu.LoadString(IDS_ABOUTBOX); E&ReQgBft  
  if (!strAboutMenu.IsEmpty()) a`D`v5G t  
  { /&E]qc*-p  
   pSysMenu->AppendMenu(MF_SEPARATOR); F;MACu;x  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); H~?7 : K  
  } "[sr0'g:  
 } ;D<;pW  
 SetIcon(m_hIcon, TRUE); // Set big icon yb-4[C:i  
 SetIcon(m_hIcon, FALSE); // Set small icon F9>"1  
 m_Key.SetCurSel(0); VHLt, ?G  
 RegisterHotkey(); !Ld[`d.|R!  
 CMenu* pMenu=GetSystemMenu(FALSE); ltv ~Kh  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); fjMmlp  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); P\h1%a/D  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); L/)eNZ  
 return TRUE; // return TRUE unless you set the focus to a control FzF#V=9lP  
} CropHB/t  
&{bNa:@  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 4j(*%da  
{ 94?/Rhs5  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) I5]58Ohx  
 { v <m=g!  
  CAboutDlg dlgAbout; /Ri-iC >  
  dlgAbout.DoModal(); O' Mma5  
 } YXg^t$  
 else +E+I.}sOB  
 { Z^.qX\<M  
  CDialog::OnSysCommand(nID, lParam); u~!Pzz3"  
 } pS8`OBenA  
} g(R!M0hdF  
V$ho9gQ!l[  
void CCaptureDlg::OnPaint() 8\bZ?n#dn  
{ S-79uo  
 if (IsIconic()) Yez  
 { sUZ2A1J}  
  CPaintDC dc(this); // device context for painting {DX1/49  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 0L \vi  
  // Center icon in client rectangle _@Y17L.  
  int cxIcon = GetSystemMetrics(SM_CXICON); }7i}dyQv}  
  int cyIcon = GetSystemMetrics(SM_CYICON); ,]4.|A_[Rq  
  CRect rect; BQ {'r^u  
  GetClientRect(&rect); DCgiTT\  
  int x = (rect.Width() - cxIcon + 1) / 2; _:Ov-HIR  
  int y = (rect.Height() - cyIcon + 1) / 2; { /Gm|*e{  
  // Draw the icon S/6I9zOP  
  dc.DrawIcon(x, y, m_hIcon); %p};Di[V  
 } D[(T--LLT  
 else % %QAC4  
 { Ifj%"RI  
  CDialog::OnPaint(); c#pVN](?  
 } }9?fb[]  
} &_Z8:5e  
u &{|f  
HCURSOR CCaptureDlg::OnQueryDragIcon() F :-6Htmj  
{ _aOsFFB1KF  
 return (HCURSOR) m_hIcon; @"`{Sh`Y$  
} \JGRd8S[  
mGUl/.;yp-  
void CCaptureDlg::OnCancel() l5_%Q+E_  
{ ^Cn_ ODjo  
 if(bTray) D"n 3If%  
  DeleteIcon(); XXZ$^W&  
  CDialog::OnCancel(); Ox f,2r  
}  h93  
XJf1LGT5  
void CCaptureDlg::OnAbout() 2@ f E!  
{ cWL 7gv\|  
 CAboutDlg dlg; FZtILlw  
 dlg.DoModal(); q,eXH8 x  
} evHKq}{  
6b#J!:?  
void CCaptureDlg::OnBrowse() cx(b5Z  
{ :#p!&Fi  
 CString str; Gnmxp%&}P|  
 BROWSEINFO bi; %D}]Z=gp  
 char name[MAX_PATH]; ic|>JX$G  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); lr@H4EJ{  
 bi.hwndOwner=GetSafeHwnd(); gw9:1S  
 bi.pszDisplayName=name; pxs`g&3yd  
 bi.lpszTitle="Select folder"; kzb1iBe 6m  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; CI6qDh6  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); a"0'cgB}  
 if(idl==NULL) WD5ulm?91|  
  return; t^1c^RpTb  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ZN?UkFnE  
 str.ReleaseBuffer(); !ZlNPPrq}  
 m_Path=str; !'EE8Tp~F  
 if(str.GetAt(str.GetLength()-1)!='\\') hgi9%>o UB  
  m_Path+="\\"; S}cm.,/w  
 UpdateData(FALSE); y:8*!}fR  
} qjp<_aw  
/0H39]y!~  
void CCaptureDlg::SaveBmp() \ >(;t#>  
{ +Ss|4O}'  
 CDC dc; ?(CMm%(8  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); _'E,g@  
 CBitmap bm; -3T6ck  
 int Width=GetSystemMetrics(SM_CXSCREEN); X pd^^  
 int Height=GetSystemMetrics(SM_CYSCREEN); r:Xui-  
 bm.CreateCompatibleBitmap(&dc,Width,Height); -*EK-j  
 CDC tdc; 0oi =}lV  
 tdc.CreateCompatibleDC(&dc); (9J,Qs[;  
 CBitmap*pOld=tdc.SelectObject(&bm); O2Mo ~}  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); @"#W\m8  
 tdc.SelectObject(pOld); 8?r ,ylUj  
 BITMAP btm; J$?*qZ(oO  
 bm.GetBitmap(&btm); )5j%."  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; jo4*,B1x  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); dviL5Eaj  
 BITMAPINFOHEADER bih; b!ZXQn3X<  
 bih.biBitCount=btm.bmBitsPixel; j[h4F"`-  
 bih.biClrImportant=0; /)PD+18  
 bih.biClrUsed=0; y$At$i>u  
 bih.biCompression=0; h*Y);mc$#  
 bih.biHeight=btm.bmHeight; ~Cj55S+  
 bih.biPlanes=1; Rt<8 &.m4  
 bih.biSize=sizeof(BITMAPINFOHEADER); @hiwq 7[j  
 bih.biSizeImage=size; j#b?P=|l  
 bih.biWidth=btm.bmWidth; i(JBBE"  
 bih.biXPelsPerMeter=0; u5 EHzoq  
 bih.biYPelsPerMeter=0; +QIM~tt)  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 5eO`u8M  
 static int filecount=0; g@.RfX=  
 CString name; J8$G-~MeJ  
 name.Format("pict%04d.bmp",filecount++); HZdmL-1Z^+  
 name=m_Path+name; ` =!&9o  
 BITMAPFILEHEADER bfh; Cd#>,,\z  
 bfh.bfReserved1=bfh.bfReserved2=0; W$0<a@  
 bfh.bfType=((WORD)('M'<< 8)|'B'); qDO4&NO  
 bfh.bfSize=54+size; $LZf&q:\]*  
 bfh.bfOffBits=54; s!09Pxc  
 CFile bf; 85l 1  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ \c+)Y}:D  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 0}c *u) ,  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); |*7uF<ink6  
  bf.WriteHuge(lpData,size); u7&r'rZ1_!  
  bf.Close(); >'/G:\M>A  
  nCount++; |$":7)e H!  
 } I-i)D  
 GlobalFreePtr(lpData); S?%V o* Y  
 if(nCount==1) YZf<S:  
  m_Number.Format("%d picture captured.",nCount); REhXW_x  
 else viAvD6e  
  m_Number.Format("%d pictures captured.",nCount); 'z2}qJJ)  
  UpdateData(FALSE); #H(|+WEu  
} Va06(Cq  
!J[3U   
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 3Qe:d_  
{ O: sjf?z  
 if(pMsg -> message == WM_KEYDOWN) Pv`yOx&nE  
 { &~U8S^os  
  if(pMsg -> wParam == VK_ESCAPE) __$IbF5  
   return TRUE; ` &|Rs  
  if(pMsg -> wParam == VK_RETURN) Vf*!m~]Vqi  
   return TRUE; 0^|)[2m!  
 } \CB{Ut+s  
 return CDialog::PreTranslateMessage(pMsg); f!*b8ND^R  
} 1&Rz'JQ+  
\*!?\Ko`W  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) R,/?p  
{ C+,;hj  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ }?#<)|_5  
  SaveBmp(); '  G-]>  
  return FALSE; ?)7uwJsH  
} k _hiGg  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ O:RPH{D  
 CMenu pop; 95aa  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ]~87v  
 CMenu*pMenu=pop.GetSubMenu(0); 4CS 9vv)9R  
 pMenu->SetDefaultItem(ID_EXITICON); HLAWx/c,j"  
 CPoint pt; CY0|.x  
 GetCursorPos(&pt); c&3 ]%urL  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); DL|,:2`  
 if(id==ID_EXITICON) z*l3O~mZ  
  DeleteIcon(); ]o_Z3xXUa  
 else if(id==ID_EXIT) 85m[^WGyh  
  OnCancel(); wtetB')yD  
 return FALSE; HW"|Hm$Y(  
} . 3=WE@M  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); "Q A#  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE)  {IYfq)c  
 AddIcon(); B1JdkL 3h  
 return res; 3) zanoYHi  
} *pk*ijdB  
ZBcZG  
void CCaptureDlg::AddIcon() /lx\9S|  
{ 4VSlgoz  
 NOTIFYICONDATA data; R(kr@hM  
 data.cbSize=sizeof(NOTIFYICONDATA); #!OCEiT_  
 CString tip; W@`Nn*S  
 tip.LoadString(IDS_ICONTIP); XN5EZ#  
 data.hIcon=GetIcon(0); h$ DFp  
 data.hWnd=GetSafeHwnd(); '49&qO5B  
 strcpy(data.szTip,tip); Ps+0qqT*  
 data.uCallbackMessage=IDM_SHELL; wW1aG  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; x:88E78  
 data.uID=98; G`8gI)$u  
 Shell_NotifyIcon(NIM_ADD,&data); 7$<.I#x  
 ShowWindow(SW_HIDE); 6,G1:BV{K  
 bTray=TRUE; CuR\JKdRo  
} !Sy._NE`z  
?!U=S=8  
void CCaptureDlg::DeleteIcon() <M B]W`5  
{ hq6fDRO/4  
 NOTIFYICONDATA data; =zDU!< U  
 data.cbSize=sizeof(NOTIFYICONDATA); >E|@3g +2  
 data.hWnd=GetSafeHwnd(); zu5'Ex`gQa  
 data.uID=98; D!h8NZ;El  
 Shell_NotifyIcon(NIM_DELETE,&data); -GD_xk  
 ShowWindow(SW_SHOW); &dh%sFy  
 SetForegroundWindow(); y{,HpPp#o  
 ShowWindow(SW_SHOWNORMAL); 7cr@;%#  
 bTray=FALSE; J_C<Erx[O  
} =MEv{9_  
:.'<ndM  
void CCaptureDlg::OnChange() i6?,2\K  
{ Bq.@CxK  
 RegisterHotkey(); "=@b>d6U+  
} 8i!AJF9IQ}  
:tp2@*] 9Z  
BOOL CCaptureDlg::RegisterHotkey() p @&>{hi@  
{ J 05@SG':  
 UpdateData(); HYyO/U9z|I  
 UCHAR mask=0; <+o-{{E[  
 UCHAR key=0; CL.JalR`b  
 if(m_bControl) z8_m<uewz  
  mask|=4; 7Ab&C&3  
 if(m_bAlt) &)JQ6J_|\  
  mask|=2; &PVos|G  
 if(m_bShift) %@#+Xpa+  
  mask|=1; $m,gQV~4  
  key=Key_Table[m_Key.GetCurSel()]; a yn6k=F  
 if(bRegistered){ Ni#!C:q  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ^E\{&kaUp  
  bRegistered=FALSE; /ts=DxCC;  
 } [bk2RaX:i  
 cMask=mask; C,~wmS )@  
 cKey=key; gyj.M`+y  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); T]-yTsto  
 return bRegistered; 6E/>]3~!  
} "RMBV}<T  
h6<abT@I  
  四、小结 'KB\K)cD=3  
`bT!_Ru  
  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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