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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: BN%cX 2j  
  ITqAy1m@C  
  一、实现方法 dhnX\/  
DbFe;3  
  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: E0fMFG^P  
=SeQ- H#  
#pragma data_seg("shareddata") vWM&4|Q1~  
HHOOK hHook =NULL; //钩子句柄 bfZt<-  
UINT nHookCount =0; //挂接的程序数目 ty"L&$bf  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 PlS)Zv3  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 :):vB  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey a)=|{QR>W  
static int KeyCount =0; =p=/@FN  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 W#NZnxOX"  
#pragma data_seg() \aM-m:J  
'Rsr*gX#  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 }[UH1+`L  
|? fAe {*  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: h4 9q(085V  
U!c+i#:t  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR <\Y(+?+uZ  
cKey,UCHAR cMask) >Ovz;  
{ wL3RcXW``e  
 BOOL bAdded=FALSE; /j$pV  
 for(int index=0;index<MAX_KEY;index++){ G/},lUzLg  
  if(hCallWnd[index]==0){ U>.5vK.+  
   hCallWnd[index]=hWnd; ]S@T|08b  
   HotKey[index]=cKey; [hg9 0Q6  
   HotKeyMask[index]=cMask; *aWh]x9TlU  
   bAdded=TRUE; 2}/r>]9^-  
   KeyCount++; lt:&lIW,3  
   break; SSE,G!@  
  } Q$]1juqg  
 } C6a-  
 return bAdded; ',WJ'g  
} 047PlS  
//删除热键 qM26:kB{  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ^q/^.Gf  
{ 1D8S}=5&  
 BOOL bRemoved=FALSE; bf2n%-&9g  
 for(int index=0;index<MAX_KEY;index++){ h>[ qXz  
  if(hCallWnd[index]==hWnd){ 8$47Y2r@  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Nb_Glf  
    hCallWnd[index]=NULL; Vraz}JV  
    HotKey[index]=0; n[K%Xs)  
    HotKeyMask[index]=0; ,%xat`d3,3  
    bRemoved=TRUE; Lk#)VGk:  
    KeyCount--; _4SZ9yu  
    break; /c-k{5mH%  
   } _:tS-Mx@5  
  } )T gfd5B  
 } %'e$N9zd  
 return bRemoved; B= E/|J</  
} AT3HH QD  
OiZ-y7;k^  
ip{ b*@K  
  DLL中的钩子函数如下: ]|w~{X!b4  
( )ldn?v  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) :]Om4Q\-#  
{ GtIAsC03  
 BOOL bProcessed=FALSE; Yqo@ g2g  
 if(HC_ACTION==nCode) udr|6EjD.  
 { +cmi?~KS*  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Hi~)C\  
   switch(wParam) Xf7]+  
   {  w^nA/=;r  
    case VK_MENU: pMViq0  
     MaskBits&=~ALTBIT; BSd.7W;cS=  
     break; d*k5h<jM  
    case VK_CONTROL: &c&TQkx  
     MaskBits&=~CTRLBIT; Ic!x y  
     break; j^U"GprA  
    case VK_SHIFT: p^ROt'eQ<  
     MaskBits&=~SHIFTBIT; "ixea- 2  
     break; 7MJ\*+T|03  
    default: //judge the key and send message J n2QvUAZ&  
     break; :-hVbS0I  
   } D[6sy`5l  
   for(int index=0;index<MAX_KEY;index++){ ZDI?"dt{  
    if(hCallWnd[index]==NULL) XA.1Y)  
     continue; UM21Cfqex  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) C;U4`0=8  
    { wCv9VvF`  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); b~)2`l  
     bProcessed=TRUE; &P35\q   
    } N,VI55J:y>  
   } g@/}SJh/>  
  } DOkuT/+  
  else if((lParam&0xc000ffff)==1){ //有键按下 $X\2h+ Os  
   switch(wParam) K~3Y8ca  
   { yqtHlz%  
    case VK_MENU: 4sH?85=j  
     MaskBits|=ALTBIT; 2* T Ir  
     break; 6jm/y@|F!  
    case VK_CONTROL: THK^u+~LM  
     MaskBits|=CTRLBIT; 3tkCmB  
     break; hPgYKa8u  
    case VK_SHIFT: >T0`( #Lm  
     MaskBits|=SHIFTBIT; )_o^d>$da  
     break; /"~UGn]R  
    default: //judge the key and send message -3b_}by  
     break; p-DHTX  
   } v|]"uPxH?  
   for(int index=0;index<MAX_KEY;index++){ a gL@A  
    if(hCallWnd[index]==NULL) >+!Ef  
     continue; T;PLUjp}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `Nz`5}8.?  
    { "K+EZ%~<  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); I};*O6D`  
     bProcessed=TRUE; 3%Q9521  
    } @" umY-1f  
   } em- <V5fb  
  } 1O,8=,K2a  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 x1E;dbOZ  
   for(int index=0;index<MAX_KEY;index++){ 'W("s  
    if(hCallWnd[index]==NULL) V 7ZGT  
     continue; @^g~F&Ta  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ]-SJ";aU  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); *{Z=)k%  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 *uy<Om  
   } 6mIK[Qnp  
  } WNKP';(a@G  
 } dq'f >S z}  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); F=#V/ #ia  
} )DlKeiK  
"{t]~urLd  
  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: SQx&4R.  
###>0(n  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); A%^7D.j  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); )1 HWD]>4  
difX7)\  
  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: S QGYH  
nf1 `)tXG  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) * >8EMq\^  
{ Q[|*P ] w  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) (-&d0a9N  
 { ?~yJ7~3TS<  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 &"hEKIqL  
  SaveBmp(); GCfVH?Vx  
  return FALSE; 1v,R<1)&  
 } AS;qJ)JfzQ  
 …… //其它处理及默认处理 %NC/zqPH~  
} {B6ywTK\ `  
~<_WYSzS  
~oT*@  
  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。 X|ZAC!J5>  
9tVV?Q@)  
  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。 0'YP9-C3  
8?YeaMIBB  
  二、编程步骤 b`^Q ':^A  
,w BfGpVb  
  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"; t*)mX2R,  
WjM7s]ZRv  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; j:/Z_v'  
R:R<Xt N`5  
  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; CA5`uh  
&;L=f;   
  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; .uxM&|0H  
>V)"TZH  
  5、 添加代码,编译运行程序。 9|v%bO  
zR]!g|;f  
三、程序代码 PwthYy  
#(i pF  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL `ZI-1&Y3  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) BzO,(bd!PI  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ /7:+.#Ag`  
#if _MSC_VER > 1000  P Je_qP  
#pragma once V %D1Q}X  
#endif // _MSC_VER > 1000  [)~1Lu  
#ifndef __AFXWIN_H__ ,-8 -Y>[  
#error include 'stdafx.h' before including this file for PCH &vn2u bauS  
#endif ?# _{h  
#include "resource.h" // main symbols `8RKpZv&  
class CHookApp : public CWinApp 6pbCQ q  
{ ugE!EEy[^  
 public: y RXWd*9  
  CHookApp(); [wnp]'+!  
  // Overrides ~QxW^DGa7]  
  // ClassWizard generated virtual function overrides ih^FH>@  
  //{{AFX_VIRTUAL(CHookApp) K%x]:|,>M  
 public: xz.Jmv  
  virtual BOOL InitInstance(); LbRQjwc]W  
  virtual int ExitInstance(); DF4CB#  
  //}}AFX_VIRTUAL ^7YNM<_%@  
  //{{AFX_MSG(CHookApp) kROIVO1|`  
  // NOTE - the ClassWizard will add and remove member functions here. 18QqZ,t  
  // DO NOT EDIT what you see in these blocks of generated code ! ; teM^zyI  
  //}}AFX_MSG L~Peerby  
  DECLARE_MESSAGE_MAP() `?3f76}h  
}; Dm5 Uy^F}  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); bp=r]nO  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); M\{\WyeX  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); h@G~' \8t  
BOOL InitHotkey(); /(51\RYkir  
BOOL UnInit(); dgoAaS2M  
#endif 7H< IO`  
Y_+#|]=$B  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Q [rZ1z  
#include "stdafx.h"  ID,_0b  
#include "hook.h" 2tpuv(H;  
#include <windowsx.h> Hxgc9Fis  
#ifdef _DEBUG ob;|%_  
#define new DEBUG_NEW xn503,5G*7  
#undef THIS_FILE d-+jb<C&  
static char THIS_FILE[] = __FILE__; TaBya0-  
#endif n{sk  
#define MAX_KEY 100 72Y 6gcg  
#define CTRLBIT 0x04 uMZ~[S z  
#define ALTBIT 0x02  ,S=[#  
#define SHIFTBIT 0x01 !uW*~u  
#pragma data_seg("shareddata") j7kX"nz  
HHOOK hHook =NULL; A`f"<W-m  
UINT nHookCount =0; Jl`^`Yv  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey S, AxrQc  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT J#F5by%8  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ge GhM>G  
static int KeyCount =0; ;6[6~L%K}  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift NOXP}M  
#pragma data_seg() jL"V0M]c  
HINSTANCE hins; 5buW\_G)  
void VerifyWindow(); P7XZ|Td4*  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) K%\r[NF  
//{{AFX_MSG_MAP(CHookApp) 4F#H$`:[  
// NOTE - the ClassWizard will add and remove mapping macros here. eb\SpdM6  
// DO NOT EDIT what you see in these blocks of generated code! cE 'LE1DK  
//}}AFX_MSG_MAP %0C [v7\  
END_MESSAGE_MAP() <7\j\`  
B=a+cT  
CHookApp::CHookApp() -|#{V.G3'  
{ m.m6.  
 // TODO: add construction code here, F8?2+w@P  
 // Place all significant initialization in InitInstance [:cD  
} 2MRd  
%%s)D4sW  
CHookApp theApp; JfN '11,$  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) OA&'T*)-A6  
{ CsA(oX  
 BOOL bProcessed=FALSE; =eU=\td^  
 if(HC_ACTION==nCode) H}F UgA;  
 { -eF-r=FR  
  if((lParam&0xc0000000)==0xc0000000){// Key up vF$( Y/  
   switch(wParam) 8>e YM  
   { 72OqXa*  
    case VK_MENU: @-dGZ 5  
     MaskBits&=~ALTBIT; mufGv%U2  
     break; ay7\Ae]  
    case VK_CONTROL: mcd{:/^?  
     MaskBits&=~CTRLBIT; 6~%><C  
     break; *pwkv7Z h  
    case VK_SHIFT: _HHvL=  
     MaskBits&=~SHIFTBIT; =SLG N`m3  
     break; =m2_:&@0x  
    default: //judge the key and send message i#*[, P~  
     break; paIjXaU1Mb  
   }  \nEMj,)  
   for(int index=0;index<MAX_KEY;index++){ YQN:&Cls  
    if(hCallWnd[index]==NULL) PG63{  
     continue; P! +Gwm{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (2# Xa,pb  
    { 0 MK}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); u @Ze@N%  
     bProcessed=TRUE; w UxFE=ia  
    } e&z@yy$  
   } T-a>k.}y  
  } v@%4i~N  
  else if((lParam&0xc000ffff)==1){ //Key down IQO|)53)  
   switch(wParam) 1- s(v)cxh  
   { t <` As6}  
    case VK_MENU: i`gM> q&  
     MaskBits|=ALTBIT; .gg0rTf=-  
     break; (s;W>,~q  
    case VK_CONTROL: vWoppt  
     MaskBits|=CTRLBIT; k4V3.i!E  
     break; \:J=tAC  
    case VK_SHIFT: zfKO)Itd  
     MaskBits|=SHIFTBIT; OWewV@VXR  
     break; 3Qe|'E,U  
    default: //judge the key and send message @G2# Z  
     break; Np+PUu>  
   } t\ oud{Cv  
   for(int index=0;index<MAX_KEY;index++) [o<hQ`&  
   { \+V"JIStUj  
    if(hCallWnd[index]==NULL) >O\+9T@  
     continue; %N-aLw\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) < 9,h!  
    { 5c]:/9&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ni2#20L  
     bProcessed=TRUE;  J| N 6r  
    } X~jdOaq{F:  
   } o^~ZXF}  
  } [cnu K  
  if(!bProcessed){ VP A+/5TW  
   for(int index=0;index<MAX_KEY;index++){ j<~Wp$\i7>  
    if(hCallWnd[index]==NULL) kaCN^yQ  
     continue; (O+d6oT=Z2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) TMMKRC1<  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); l48$8Mgrr  
   } "6'",  
  } }%Mdf6LS64  
 } ;"nO'wN:h  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); [gBf1,bK  
} %8n<#0v-|4  
vm|u~Yd,s  
BOOL InitHotkey() k";dK*hD,  
{ <5E'`T  
 if(hHook!=NULL){ k3$'K}=d  
  nHookCount++; i6V$mhL  
  return TRUE; -]0:FKW  
 } ,CyX*k8o  
 else  )58O9b  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); {%3WHGr%L  
  if(hHook!=NULL) bpBn3f`?*  
   nHookCount++; dnLjcHFj&  
  return (hHook!=NULL); 5Hu[*  
} v,}C~L3  
BOOL UnInit() i$] :Y`3h  
{ *Vl#]81~  
 if(nHookCount>1){ clU ?bF~e1  
  nHookCount--; {nmu(E P  
  return TRUE; %J1'>nI!q  
 } W]eILCo  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Q(f0S  
 if(unhooked==TRUE){ n3$=&   
  nHookCount=0; j:cu;6|  
  hHook=NULL; \L(jNN0_R  
 } legWY)4D;  
 return unhooked; c-hc.i}!  
} 5b"=m9{g  
=Lkn   
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) W\Pd:t  
{ -E\G3/*51  
 BOOL bAdded=FALSE; 7=N%$]DKZ  
 for(int index=0;index<MAX_KEY;index++){ 3q4Zwv0z20  
  if(hCallWnd[index]==0){ lknj/i5L  
   hCallWnd[index]=hWnd; I?D=Q $s  
   HotKey[index]=cKey; PWS8Dpb  
   HotKeyMask[index]=cMask; :.AC%'S  
   bAdded=TRUE; d"n>Q Tn\  
   KeyCount++; |5(un#  
   break; UhW{KIW  
  } 2T*kmDp  
 } <y?+xZM]#|  
 return bAdded; -I{op wd  
} &PPnI(s^K  
6%p6BK6  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 8WDL.IO  
{ Byw EoS  
 BOOL bRemoved=FALSE; e- `9-U%6  
 for(int index=0;index<MAX_KEY;index++){ {P?Ge  
  if(hCallWnd[index]==hWnd){ vVtkB$]L  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ !KXcg9e  
    hCallWnd[index]=NULL; H9jlp.F  
    HotKey[index]=0; ij] ~n  
    HotKeyMask[index]=0; @{qcu\sZ  
    bRemoved=TRUE; P\ P=1NM  
    KeyCount--; kVsX/ ~$  
    break; a`yCPnB(  
   } #(qvhoi7lM  
  } 0UpRSh)#  
 } W:<2" &7  
 return bRemoved; LT{g^g  
} "8a V~]~Dj  
ISZEP8w  
void VerifyWindow() 9*j"@Rm  
{ ,hNs{-*  
 for(int i=0;i<MAX_KEY;i++){ MA tF,  
  if(hCallWnd!=NULL){ M GC=L .  
   if(!IsWindow(hCallWnd)){ =S54p(>  
    hCallWnd=NULL; 9r\p4_V  
    HotKey=0; S~ckIN]  
    HotKeyMask=0; g#{7qmM  
    KeyCount--; q) 5s'(  
   } CA|W4f}  
  } &gV9h>Kc#  
 } M Ir[_  
} tWZ8(E$  
@?tR-L<u  
BOOL CHookApp::InitInstance() F'<XB~ &o  
{ r8y,$Mv<)0  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); y1Br4K5C  
 hins=AfxGetInstanceHandle(); agoMsxI9  
 InitHotkey(); p/ZgzHyF  
 return CWinApp::InitInstance(); U>n.+/ss  
} 'u PI~l`g  
Ktuv a3=>N  
int CHookApp::ExitInstance() %> YRNW@%  
{ V?MaI .gj  
 VerifyWindow(); (Gzq 1+B  
 UnInit(); :gkn`z  
 return CWinApp::ExitInstance(); 0 n{+_   
} 9Z2aFW9  
>r:z`^p  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file jRk1Iu|7  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) L{f0r!d|  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ A9HgABhax  
#if _MSC_VER > 1000 w &^Dbme  
#pragma once #B$_ily)  
#endif // _MSC_VER > 1000 $KRpu<5i}  
j}%C;;MPH  
class CCaptureDlg : public CDialog (:# 4{C  
{ )Zyw^KN^  
 // Construction >tkU+$;-  
 public: *q1sM#;5  
  BOOL bTray; [HRP&jr  
  BOOL bRegistered; fxD|_  
  BOOL RegisterHotkey(); :=`N2D  
  UCHAR cKey; yle~hL  
  UCHAR cMask; )Vy}oFT\  
  void DeleteIcon(); [+dTd2uZ<\  
  void AddIcon(); A@EUH  
  UINT nCount; V+y:!t`  
  void SaveBmp(); OB+I.qlHP  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor O;;vz+ j  
  // Dialog Data q'[yYPDX5x  
  //{{AFX_DATA(CCaptureDlg) '6>nXp?)r  
  enum { IDD = IDD_CAPTURE_DIALOG }; >\ym{@+*  
  CComboBox m_Key; u $T'#p1  
  BOOL m_bControl; m}-~VYDj  
  BOOL m_bAlt; ""F' Nzy  
  BOOL m_bShift; pdR&2fp  
  CString m_Path; ~Ywto  
  CString m_Number; 8:UV;5@  
  //}}AFX_DATA ^p7Er!  
  // ClassWizard generated virtual function overrides D)LqkfJ}z^  
  //{{AFX_VIRTUAL(CCaptureDlg) }"9jCxXL  
 public: =kWm9W<^  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Y'i_EX|  
 protected: RiAY>:  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support GfT`>M?QGK  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); LMte,zs>  
  //}}AFX_VIRTUAL #%tN2cFDN  
  // Implementation 0~N2MoOl^  
 protected: 4#@zn 2l  
  HICON m_hIcon; faaFmEC  
  // Generated message map functions (}n,Ou[  
  //{{AFX_MSG(CCaptureDlg) oBTRO0.s+  
  virtual BOOL OnInitDialog(); E%C02sI  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Ke+#ww  
  afx_msg void OnPaint(); KrT+Svm  
  afx_msg HCURSOR OnQueryDragIcon(); Cy##+u,C  
  virtual void OnCancel(); 6~0. YZ9  
  afx_msg void OnAbout(); ^cF_z}Zi+  
  afx_msg void OnBrowse(); +3n07d  
  afx_msg void OnChange(); e|ngnkf(G  
 //}}AFX_MSG 6rOd80\  
 DECLARE_MESSAGE_MAP() W.u}Q@  
}; <}$o=>'  
#endif  OL|UOG  
 cUz7F  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file @'EU\Y\l  
#include "stdafx.h" [MKL>\U  
#include "Capture.h" *L.+w-g&&  
#include "CaptureDlg.h" RcH",*U  
#include <windowsx.h> !bG%@{WT  
#pragma comment(lib,"hook.lib") 1x#Z}XG  
#ifdef _DEBUG |};P"&  
#define new DEBUG_NEW /"$;3n~  
#undef THIS_FILE 14p <0BG  
static char THIS_FILE[] = __FILE__; +,"/z\QO  
#endif WL<$(y:H  
#define IDM_SHELL WM_USER+1 Ul@yXtj  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); q}#4bB9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); /=}w%-;/;  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 0;j)rmt  
class CAboutDlg : public CDialog lXS.,#lp  
{ E1'HdOh&z  
 public: :!\?yj{{  
  CAboutDlg(); kw>W5tNpf:  
  // Dialog Data {re<S<j&  
  //{{AFX_DATA(CAboutDlg) +KV`+zic+  
  enum { IDD = IDD_ABOUTBOX }; p#UrZKR  
  //}}AFX_DATA ) )q4Rh  
  // ClassWizard generated virtual function overrides C$~2FTx  
  //{{AFX_VIRTUAL(CAboutDlg) 6;g"`l51  
 protected: 5 #)5Z8`X  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support <0r2m4z  
  //}}AFX_VIRTUAL l.c*, 9  
  // Implementation 'Tn i;  
 protected: 0Z{f!MOh  
  //{{AFX_MSG(CAboutDlg) @-9I<)Z/2  
  //}}AFX_MSG VL5GX (  
  DECLARE_MESSAGE_MAP() |^^'GZ%a  
}; 3?F*|E_  
XrY\ot`,D  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) iX]Vkx  
{ 2HNKq<  
 //{{AFX_DATA_INIT(CAboutDlg) Fy^=LrH=D  
 //}}AFX_DATA_INIT u:Fa1 !4JR  
} !=7 (3< ?  
-\OvOkr  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 18ApHp  
{ eM";P/XaX  
 CDialog::DoDataExchange(pDX); ztcV[{[g  
 //{{AFX_DATA_MAP(CAboutDlg) :C*7 DS  
 //}}AFX_DATA_MAP 'O%itCy)  
} ^Oy97Y  
\':'8:E  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) A dNQS  
 //{{AFX_MSG_MAP(CAboutDlg) N?Byp&rqI<  
 // No message handlers &M p??{g  
 //}}AFX_MSG_MAP ,Jm2|WKH  
END_MESSAGE_MAP() V*X6 <}  
fhGI  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) eD4D<\*  
: CDialog(CCaptureDlg::IDD, pParent) }^!8I7J.  
{ cR'l\iv+  
 //{{AFX_DATA_INIT(CCaptureDlg) or~2r8  
  m_bControl = FALSE; |]--sUx:  
  m_bAlt = FALSE; >|{n";n&  
  m_bShift = FALSE; ,E8:!r)6  
  m_Path = _T("c:\\"); w; [ndZCY7  
  m_Number = _T("0 picture captured."); Q&j-a;L  
  nCount=0; B bU%p  
  bRegistered=FALSE; S$~T8_m^U  
  bTray=FALSE; YfRjr  
 //}}AFX_DATA_INIT &8p]yo2zO  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 '%Cc!63t*  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); LqNt.d @  
} O;zq(/,-l  
bSa%?laS  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Qt-7jmZw1  
{ 9:DT+^BB  
 CDialog::DoDataExchange(pDX); R;mA2:W)x  
 //{{AFX_DATA_MAP(CCaptureDlg) `_YXU  
  DDX_Control(pDX, IDC_KEY, m_Key); tx` Z?K[  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); p **Sd[|  
  DDX_Check(pDX, IDC_ALT, m_bAlt); l k~VvRq  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); |7Dc7p"D  
  DDX_Text(pDX, IDC_PATH, m_Path); 55Pe&V1=  
  DDX_Text(pDX, IDC_NUMBER, m_Number); f.yvKi.Cm  
 //}}AFX_DATA_MAP qQ&=Z` p!  
} 6 zyxGJ(  
v11Uw?CM  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) |Y-{)5/5}  
//{{AFX_MSG_MAP(CCaptureDlg) `T'[H/  
 ON_WM_SYSCOMMAND() NUO#[7OK+x  
 ON_WM_PAINT() "A( D}~i  
 ON_WM_QUERYDRAGICON() 1U)U{i7j  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) .ZOG,h+8  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) X%C`('"R  
 ON_BN_CLICKED(ID_CHANGE, OnChange) nYsB^Nr6  
//}}AFX_MSG_MAP g5& ZXA  
END_MESSAGE_MAP() wI5(`_l{G  
14~#k%zO(  
BOOL CCaptureDlg::OnInitDialog() dI(1L~  
{ SO|!x}GfI  
 CDialog::OnInitDialog(); ,+P2B%2c  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); X-4(oE  
 ASSERT(IDM_ABOUTBOX < 0xF000); @vc9L  
 CMenu* pSysMenu = GetSystemMenu(FALSE);  l;;,[xhq  
 if (pSysMenu != NULL) _^Z v[P  
 { 9kzJ5}  
  CString strAboutMenu; G1 K@Ir<  
  strAboutMenu.LoadString(IDS_ABOUTBOX); E8/Pi>QW  
  if (!strAboutMenu.IsEmpty()) m$.7) 24  
  { ul-O3]\'@  
   pSysMenu->AppendMenu(MF_SEPARATOR); \? n<UsI  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); v)j3YhY  
  } oA*88c+{f  
 } >qy$W4  
 SetIcon(m_hIcon, TRUE); // Set big icon @?n~v^  
 SetIcon(m_hIcon, FALSE); // Set small icon YB+My~fw{l  
 m_Key.SetCurSel(0); M7fPaJKL  
 RegisterHotkey(); h.pVIO`  
 CMenu* pMenu=GetSystemMenu(FALSE); {_G_YL[  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); s?JOGu  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); FrsXLUY  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); LVaJyI@/>  
 return TRUE; // return TRUE unless you set the focus to a control F2>W{-H+  
} tXCgRU  
X Z=%XB:?  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) WCYVonbg"  
{ -]Ny-[P  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 3:aj8F2  
 { en"\2+{Cg  
  CAboutDlg dlgAbout; vkLKzsN' ]  
  dlgAbout.DoModal(); s-4qK(ml-  
 } 0}` 0!Kv  
 else |fB/hs \  
 { nGM;|6x"8|  
  CDialog::OnSysCommand(nID, lParam); mhMTn*9  
 } rA|&G'  
} 7*kTu0m  
uO((Mg  
void CCaptureDlg::OnPaint() gg.lajX  
{ t=\ ffpA  
 if (IsIconic()) ,z01 *Yx  
 { 3F8K F`*  
  CPaintDC dc(this); // device context for painting bt"5.nm  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ><C9PS@  
  // Center icon in client rectangle tmQ,>   
  int cxIcon = GetSystemMetrics(SM_CXICON); mLV0J '  
  int cyIcon = GetSystemMetrics(SM_CYICON); e F(oHn,  
  CRect rect; w0O(>  
  GetClientRect(&rect); 3fUiYI|&7  
  int x = (rect.Width() - cxIcon + 1) / 2; $T_>WUiK  
  int y = (rect.Height() - cyIcon + 1) / 2; ,b<m],p  
  // Draw the icon h %5keiA  
  dc.DrawIcon(x, y, m_hIcon); Q yhu=_&  
 } `Bb32L   
 else 1*f/Y9 Z  
 { ey$H2zmo  
  CDialog::OnPaint(); HOrXxxp1^  
 } ^SbxClUfw!  
} N"7BV  
L/)eNZ  
HCURSOR CCaptureDlg::OnQueryDragIcon() FzF#V=9lP  
{ SB:z[kfz|  
 return (HCURSOR) m_hIcon; lm*C:e)4A  
} hbSKlb0d  
k&:~l@?O  
void CCaptureDlg::OnCancel() )1g\v8XT  
{ {rzQ[_)EC  
 if(bTray) #+ {%>f  
  DeleteIcon(); ($!g= 7  
  CDialog::OnCancel(); J&L#^f*d  
} u63Q<P<  
U^Iq]L  
void CCaptureDlg::OnAbout() qykI[4  
{ \Hu?K\SWs  
 CAboutDlg dlg; P )[QC  
 dlg.DoModal(); U%KgLg#  
} xv7nChB  
^Yo2R  
void CCaptureDlg::OnBrowse() /S9n!H:MT  
{ -h2 1  
 CString str; PI)uBA;  
 BROWSEINFO bi; GXR7Ug}k  
 char name[MAX_PATH]; 6Z-[-0o+g  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 7'7o^> !  
 bi.hwndOwner=GetSafeHwnd(); ~Q)Dcit-  
 bi.pszDisplayName=name; ,UfB{BW  
 bi.lpszTitle="Select folder"; D7C%Y^K]>E  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; &>Z p}.V  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ah!fQLMH  
 if(idl==NULL) LufZ,  
  return; V_9> Z?  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); T_qh_L3  
 str.ReleaseBuffer(); nN(Q}bF  
 m_Path=str; Ws[d.El  
 if(str.GetAt(str.GetLength()-1)!='\\') t`0(5v  
  m_Path+="\\"; ; zfBe%Uf  
 UpdateData(FALSE); J|b:Zo9<f"  
} ?D]T| =EZY  
_LLE~nUK"/  
void CCaptureDlg::SaveBmp() m A|"  
{ DO? bJ01  
 CDC dc; [~ |e:  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Y0nuwX*{  
 CBitmap bm; nHB`<B  
 int Width=GetSystemMetrics(SM_CXSCREEN); dYhLk2  
 int Height=GetSystemMetrics(SM_CYSCREEN); nb|"dK|  
 bm.CreateCompatibleBitmap(&dc,Width,Height); D"n 3If%  
 CDC tdc; Jm}zit:o  
 tdc.CreateCompatibleDC(&dc); :6frx=<  
 CBitmap*pOld=tdc.SelectObject(&bm); d?(eL(W  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); e7gWz~  
 tdc.SelectObject(pOld); }UHoa  
 BITMAP btm; 3yIC@>&y(8  
 bm.GetBitmap(&btm); !& xc.39  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; U_e e3KKA  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); HltURTbI  
 BITMAPINFOHEADER bih; .e2 K\o  
 bih.biBitCount=btm.bmBitsPixel; L QP4#7  
 bih.biClrImportant=0; veGRwir  
 bih.biClrUsed=0; &MF%zJ6  
 bih.biCompression=0; pi?U|&.1z  
 bih.biHeight=btm.bmHeight; zf^F.wW  
 bih.biPlanes=1; ek4?|!kQD  
 bih.biSize=sizeof(BITMAPINFOHEADER); w~=@+U$f  
 bih.biSizeImage=size; &:*|KxX  
 bih.biWidth=btm.bmWidth; [+v}V ,jb  
 bih.biXPelsPerMeter=0; f<G:}I  
 bih.biYPelsPerMeter=0; `F1 ( v  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); )*3sE1  
 static int filecount=0; o*WI*Fb'  
 CString name; %j?<v@y  
 name.Format("pict%04d.bmp",filecount++); 18U CZ;)>  
 name=m_Path+name; K.jm>]'z4;  
 BITMAPFILEHEADER bfh; {pNf& '  
 bfh.bfReserved1=bfh.bfReserved2=0; [ Lo}_v&  
 bfh.bfType=((WORD)('M'<< 8)|'B'); +Udlt)H  
 bfh.bfSize=54+size; .EUOKPK4W  
 bfh.bfOffBits=54; VR9C< tMSi  
 CFile bf; *QpKeI  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ M0zlB{eH  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); <U]#722  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Wc)f:]7  
  bf.WriteHuge(lpData,size); (S#4y  
  bf.Close(); u)fmXoQ  
  nCount++; URD<KIN>  
 } OVm $  
 GlobalFreePtr(lpData); Q!VPk~~(  
 if(nCount==1) O{9h'JU  
  m_Number.Format("%d picture captured.",nCount); %%w]-`^h,  
 else ,&IBj6%Y  
  m_Number.Format("%d pictures captured.",nCount); Y+tXWN"8  
  UpdateData(FALSE); j@b4)t  
} zk@K uBLL  
43Yav+G(+  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 3J{`]v5`  
{ !%?X% @9  
 if(pMsg -> message == WM_KEYDOWN) }X3SjNd q  
 { @M-+-6+  
  if(pMsg -> wParam == VK_ESCAPE) mu/O\'5  
   return TRUE; [$Ld>`3  
  if(pMsg -> wParam == VK_RETURN) _azg 0.)  
   return TRUE; [a*m9F\ ,  
 } h+x"?^   
 return CDialog::PreTranslateMessage(pMsg); TK;*:K8oe  
} V(Ps6jR"BS  
 (Ia}]q  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) E VBB:*q6  
{ wvm`JOP:A  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Vet7a_  
  SaveBmp(); vb}; _/ #?  
  return FALSE; Q- %Q7n'c  
} oO|zRK1;/  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ M ,8r{[2  
 CMenu pop; vvLm9Tw  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); _Va!Ky =]  
 CMenu*pMenu=pop.GetSubMenu(0); *Ri?mEv hF  
 pMenu->SetDefaultItem(ID_EXITICON); 92GO.xAD?  
 CPoint pt; i=-zaboo  
 GetCursorPos(&pt); n}qHt0N  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); :xfD>K  
 if(id==ID_EXITICON) ;PJWd|3  
  DeleteIcon(); Pt?]JJxl-  
 else if(id==ID_EXIT) AyKaazm]9  
  OnCancel(); qbkvwL9  
 return FALSE; m u(HNj  
} Pn5@7~  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); :QsGwhB  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 0 iW]#O/  
 AddIcon(); UcDJ%vI  
 return res; zqqpBwk#  
} uYS?# g  
Ix%h /=I  
void CCaptureDlg::AddIcon() EW1 L!3K  
{ W?G4\ubM3<  
 NOTIFYICONDATA data; )]!Ps` ,u  
 data.cbSize=sizeof(NOTIFYICONDATA); fM_aDSRa!H  
 CString tip; cU5x8[2  
 tip.LoadString(IDS_ICONTIP); @dcT8 YC  
 data.hIcon=GetIcon(0); K GkzE  
 data.hWnd=GetSafeHwnd(); *J?QXsg  
 strcpy(data.szTip,tip); J /'woc  
 data.uCallbackMessage=IDM_SHELL; er^z:1'  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; &TSt/b/+W  
 data.uID=98; J}TS-j0  
 Shell_NotifyIcon(NIM_ADD,&data); :N%cIxrqP  
 ShowWindow(SW_HIDE); 7(eWBJfTo  
 bTray=TRUE; bc5+}&W  
} r~u/M0h `  
SMk{159q&  
void CCaptureDlg::DeleteIcon() }.4`zK&SB  
{ TvAA  
 NOTIFYICONDATA data; )m"NO/sJ2  
 data.cbSize=sizeof(NOTIFYICONDATA); ];^A8?  
 data.hWnd=GetSafeHwnd(); a |32Pn  
 data.uID=98; Et%s,zeA{2  
 Shell_NotifyIcon(NIM_DELETE,&data); lKI1bs]i  
 ShowWindow(SW_SHOW); |h*H;@$  
 SetForegroundWindow(); y)|Q~8r  
 ShowWindow(SW_SHOWNORMAL); xg'z_W  
 bTray=FALSE; r`i<XGPJ%  
} ss%ahs  
\S}&QV  
void CCaptureDlg::OnChange() 4 Yc9Ij  
{ \)DP(wC  
 RegisterHotkey(); #,qw~l]  
} vX)JJ|g  
3otia ;&B  
BOOL CCaptureDlg::RegisterHotkey() wtetB')yD  
{ R"Hhc(H  
 UpdateData(); D.j'n-yw  
 UCHAR mask=0; y^pk)`y8  
 UCHAR key=0; K&9|0xt  
 if(m_bControl) U'UV=:/-  
  mask|=4; &iR>:=ks N  
 if(m_bAlt)  <G{m=  
  mask|=2; r{$ip"f  
 if(m_bShift) 26yv w  
  mask|=1; qWGnIPk  
  key=Key_Table[m_Key.GetCurSel()]; V? w;YTg  
 if(bRegistered){ c\-5vw||b  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 92WvD  
  bRegistered=FALSE; _jR%o1Y}  
 } kUmrJBh$  
 cMask=mask; m7zen530  
 cKey=key; [95(%&k.Q  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ,_r"=>?@  
 return bRegistered; \$/)o1SG  
} 2w'Q9&1~  
G`8gI)$u  
  四、小结 JWr:/?  
6,G1:BV{K  
  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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