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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: );EW(7KeL  
  %]NaHf  
  一、实现方法 yKupPp);  
pFE&`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: /zxLnT; 5  
(=#[om( A  
#pragma data_seg("shareddata") u\-WArntc  
HHOOK hHook =NULL; //钩子句柄 $Ro]]NUz|  
UINT nHookCount =0; //挂接的程序数目 Mn$w_Z?  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 K+2k}Hx6J  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 1,UeVw/  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey I ACpUB  
static int KeyCount =0; V9aGo#  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 iA*^`NMaT  
#pragma data_seg() ^na8d's:  
]?KTw8j}  
  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。 MR4e.+#E  
}/)vOUcEd  
  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: 2stBW5v3  
2J7= O^$?  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR bm/pLC6%.  
cKey,UCHAR cMask) cyYsz'i m  
{ XS:W{tL!  
 BOOL bAdded=FALSE; X}"Ic@8  
 for(int index=0;index<MAX_KEY;index++){ D*7JE  
  if(hCallWnd[index]==0){ Y)~Y;;/G  
   hCallWnd[index]=hWnd; tYb8a  
   HotKey[index]=cKey; >4I,9TO  
   HotKeyMask[index]=cMask; Gg'sgn   
   bAdded=TRUE; JH3$G,:zM  
   KeyCount++; |5J'`1W  
   break; GxH]  
  } KmF" Ccc  
 } ,q9nHZG^  
 return bAdded; )9F o  
} u7PtGN0r%  
//删除热键 RWyDX_z#<  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Vo1,{"k  
{ s?-@8.@  
 BOOL bRemoved=FALSE; ]oOSL=~c  
 for(int index=0;index<MAX_KEY;index++){ x? 10^~R  
  if(hCallWnd[index]==hWnd){ %63zQFk  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ h"C7l#u  
    hCallWnd[index]=NULL; U&F1}P$fb  
    HotKey[index]=0; 2pr#qh8  
    HotKeyMask[index]=0; 7Iz%Jty  
    bRemoved=TRUE; d7, ZpHt  
    KeyCount--; Hlh`d N  
    break; (RXOv"''=  
   } n8h1S lK08  
  } \!-IY  
 } _LVwjZX[  
 return bRemoved; 5hxG\f#}?  
} V]E# N  
MH wjJ  
[p&n]T  
  DLL中的钩子函数如下: rE->z  
vR`#kxSdJ@  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Go^a~Sf$  
{ :?uUh  
 BOOL bProcessed=FALSE; [N@t/^gRC  
 if(HC_ACTION==nCode) " a&|{bv  
 { ]81t~t9LQ  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 WFr;z*  
   switch(wParam) F!k3/z  
   {  qS8p)pw  
    case VK_MENU: t(~V:+W9  
     MaskBits&=~ALTBIT; [ADSGnw  
     break; 9_=0:GH k  
    case VK_CONTROL: ~wejy3|@0  
     MaskBits&=~CTRLBIT; z (1zth  
     break; 4n9".UHh  
    case VK_SHIFT: egXHp<bqw  
     MaskBits&=~SHIFTBIT; `EBI$;!  
     break; %-nYK3  
    default: //judge the key and send message X  jPPgI  
     break; J\@ r ~x5G  
   } ,0hk)Vvr3  
   for(int index=0;index<MAX_KEY;index++){ _DDknQP  
    if(hCallWnd[index]==NULL) |2L|Zp&  
     continue; FR BW(vKE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))  v|K,  
    { !g`^<y!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 54lU~ "  
     bProcessed=TRUE; kT@m*Etr{  
    } DPWt=IFU  
   } l1M %   
  } AfAlDM'  
  else if((lParam&0xc000ffff)==1){ //有键按下 h0cdRi  
   switch(wParam) LL0Y$pHV  
   { (^{tu89ab  
    case VK_MENU: '3i,^g0?t0  
     MaskBits|=ALTBIT; ]2_b_ok  
     break; _ww>u""B~  
    case VK_CONTROL: m}-*B1  
     MaskBits|=CTRLBIT; ~M c'~:{O  
     break; ]NEr]sc-"F  
    case VK_SHIFT: cD%_+@GaU  
     MaskBits|=SHIFTBIT; S|jE1v"L  
     break; L2sUh+'|  
    default: //judge the key and send message o^efeI  
     break; gTM*td(~^  
   } $q|-9B  
   for(int index=0;index<MAX_KEY;index++){ yv;KKQ   
    if(hCallWnd[index]==NULL) mhNX05D  
     continue; 5V $H?MW>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) mi';96  
    { n%S%a >IQj  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); >fq]c  
     bProcessed=TRUE; sQ}E4Iq1#S  
    } ; _K3/:  
   } XfYbWR  
  } )K}-z+$)k  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 mfW}^mu  
   for(int index=0;index<MAX_KEY;index++){ q+Ec|Xd e  
    if(hCallWnd[index]==NULL) b)[2t^zG  
     continue; mG*ER^Y@D  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) IDY2X+C#U  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); L-9 AJk>V  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 )ep1`n-  
   } ymW? <\AD,  
  } u*S-Pji,x  
 } /'l"Us},^!  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); T Ob(  
} yg^ 4<A  
]3\%i2NM  
  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: `x:O&2  
h(/& ;\Cr  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^$AJV%3wI  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); %TeH#%[g>\  
%MM)5MsB  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: `9Rj;^NJ  
\zT{zO&!  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) BO,xA-+  
{ Be~ '@  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) aN;c.1TY  
 { -`A+Qp)  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 8yC/:_ML  
  SaveBmp(); hDf!l$e.  
  return FALSE; *}'3|e4w}  
 } Qx_]oz]NY  
 …… //其它处理及默认处理 }Pm; xHnf&  
} S8,e `F  
pSl4^$2XR  
pV(qan,  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 ,@]*Xgt=  
rU |%  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 3^,p$D<T:,  
0aqq*e'c  
  二、编程步骤 Y D,<]q%  
0JXXJ:dB  
  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"; [$D%]]/,  
IcA]B?+  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ]Om;bmwt  
}3/|;0j$  
  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; 6n:oEXM>  
ILIv43QKM(  
  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; A D%9;KQ8  
v hGX&   
  5、 添加代码,编译运行程序。 xqpq|U  
z^o7&\:  
三、程序代码 tPb<*{eG  
%w;wQ_  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL j%)@f0Ng  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) yTR5*{?j  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ o&)v{q  
#if _MSC_VER > 1000 '[vC C'  
#pragma once "uP~hFA7M  
#endif // _MSC_VER > 1000 +,zV [\  
#ifndef __AFXWIN_H__ Hbl&)!I  
#error include 'stdafx.h' before including this file for PCH .1f!w!ltVR  
#endif 7po;*?Ox  
#include "resource.h" // main symbols \HL66%b[  
class CHookApp : public CWinApp RN2z/F Uf  
{ m>^vr7  
 public: G2dPm}sZG  
  CHookApp(); nH}V:C  
  // Overrides (7C$'T-ZK  
  // ClassWizard generated virtual function overrides @GWlo\rM6^  
  //{{AFX_VIRTUAL(CHookApp) TPA*z9n+B  
 public: 5Y>fVq{U?;  
  virtual BOOL InitInstance(); b(~#CHg  
  virtual int ExitInstance(); -HvJ&O.V$  
  //}}AFX_VIRTUAL o]B2^Yq;x  
  //{{AFX_MSG(CHookApp) 6Z5$cR_vC7  
  // NOTE - the ClassWizard will add and remove member functions here. TMD*-wYr  
  // DO NOT EDIT what you see in these blocks of generated code ! uBw[|,yn2*  
  //}}AFX_MSG c27Zh=;Tj  
  DECLARE_MESSAGE_MAP() F8&L'@m9>  
}; @o6!  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); i(YR-vYK  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ?L"x>$  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); -Dwe,N"{2  
BOOL InitHotkey(); {8556>\~  
BOOL UnInit(); ybv]wBpM:  
#endif >@EwfM4[e  
}_D{|! !!T  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. &MBm1T|Y  
#include "stdafx.h" j>3Fwg9V  
#include "hook.h" bsc#Oq]  
#include <windowsx.h> U45-R -  
#ifdef _DEBUG .Ms$)1  
#define new DEBUG_NEW R@KWiV  
#undef THIS_FILE w{riXOjS4  
static char THIS_FILE[] = __FILE__; k- exqM2x=  
#endif c_u7O \  
#define MAX_KEY 100 =N2@H5+7  
#define CTRLBIT 0x04 1U(!%},  
#define ALTBIT 0x02 cR/e Zfl  
#define SHIFTBIT 0x01 Gh}* <X;N  
#pragma data_seg("shareddata") hyY^$p+  
HHOOK hHook =NULL; zVis"g`  
UINT nHookCount =0; P]7s1kgaS  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ZU`HaL$  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT AD >/#Ul  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 9hgIQl  
static int KeyCount =0; 1[-RIN;U8  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift rIX 40,`  
#pragma data_seg() !Pu7%nV.  
HINSTANCE hins; jX,A.  
void VerifyWindow(); [6?x 6_M  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) _MTvNs  
//{{AFX_MSG_MAP(CHookApp) b/4gs62{k  
// NOTE - the ClassWizard will add and remove mapping macros here. D >kkA|>  
// DO NOT EDIT what you see in these blocks of generated code! UMH~Q`"  
//}}AFX_MSG_MAP tPDB'S:&3  
END_MESSAGE_MAP() X^C $|:  
]j.!   
CHookApp::CHookApp() w$`u_P|@E:  
{ I.o3Old  
 // TODO: add construction code here, &-x/c\jz  
 // Place all significant initialization in InitInstance D"K! ELGW  
} u@aM8Na  
.:/X~{  
CHookApp theApp; ~]BR(n  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) :I^4ILQCD  
{ M#yUdl7d  
 BOOL bProcessed=FALSE; qJ$S3B  
 if(HC_ACTION==nCode) xzRC %  
 { 1?r$Rx<R  
  if((lParam&0xc0000000)==0xc0000000){// Key up |[!0ry*N%  
   switch(wParam) xRF_'|e  
   { ?h8/\~Dw  
    case VK_MENU: P.~sNd oJ  
     MaskBits&=~ALTBIT; { h;i x  
     break; &A^2hPe}  
    case VK_CONTROL: 7>gW2 m  
     MaskBits&=~CTRLBIT; Si|8xq$E;  
     break; 7A  
    case VK_SHIFT: AI .2os*  
     MaskBits&=~SHIFTBIT; ve4 QS P  
     break; *T{KpiuP  
    default: //judge the key and send message Ds\f?\Em  
     break; (; Zl  
   } %Jn5M(myC  
   for(int index=0;index<MAX_KEY;index++){ vf`]  
    if(hCallWnd[index]==NULL) C |rl",&  
     continue; 'YEiT#+/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) e co=ia  
    { !Tu.A@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); *gI9CVfQl  
     bProcessed=TRUE; 5JZZvc$au  
    } [ HjGdC  
   } /PkOF ((  
  } lqKwjJ tX  
  else if((lParam&0xc000ffff)==1){ //Key down C,u;l~zz  
   switch(wParam) .|K\1qGW0  
   {  uMBb=   
    case VK_MENU: U4Pk^[,p1G  
     MaskBits|=ALTBIT; $P&27  
     break; b*a}~1  
    case VK_CONTROL: +Jc-9Ko\c;  
     MaskBits|=CTRLBIT; '`p0T%w  
     break; vaZ?>94  
    case VK_SHIFT: BimM)4g  
     MaskBits|=SHIFTBIT; g: "Hg-s  
     break; wD[qE  
    default: //judge the key and send message *tT5Zt/&Sr  
     break; St1>J.k_  
   } c{f1_qXN  
   for(int index=0;index<MAX_KEY;index++) 8\Eq(o}7  
   { 7M9s}b%?  
    if(hCallWnd[index]==NULL) 5?|PC.  
     continue; .T*7nw  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) CY9`HQ1  
    { FD}>}fLv  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); g/,O51f'  
     bProcessed=TRUE; k_Edug~B  
    } dk2o>jI4;  
   } SiJX5ydz  
  } v aaZ  
  if(!bProcessed){ upH%-)%'  
   for(int index=0;index<MAX_KEY;index++){ '?!2h'  
    if(hCallWnd[index]==NULL) ;"GI~p2~7  
     continue; dnTXx*I:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ^F1zkIE  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ]9pcDZB  
   } jNseD  
  } YJwz*@l  
 } __||cQ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); BcoE&I?[m|  
} 0b}lwo,|\  
+<I1@C  
BOOL InitHotkey() O~&l.>??  
{ k)USLA  
 if(hHook!=NULL){ r,dxW5v.  
  nHookCount++; ^A$~8?f  
  return TRUE; ^SRa!8z$W  
 } 1vxh3KS.  
 else (.3L'+F  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);  ?hpk)Qu  
  if(hHook!=NULL) R:JS)>B  
   nHookCount++; ( ]o6Pi  
  return (hHook!=NULL); iJE|u  
} 'C*NyHc  
BOOL UnInit() -/&6}lD  
{ VVje|T^{Z  
 if(nHookCount>1){ }fs;yPl,  
  nHookCount--; )+9D$m=P;  
  return TRUE; egi?Qg  
 } G8?<(.pi@  
 BOOL unhooked = UnhookWindowsHookEx(hHook); W.,J'  
 if(unhooked==TRUE){ efP2 C\  
  nHookCount=0; am05>c9  
  hHook=NULL; `\P:rn95;  
 } Y<.F/iaH  
 return unhooked; D2Go,1  
} _>:g&pS/  
tdr*>WL  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 4/ U]7Y  
{ _.06^5o  
 BOOL bAdded=FALSE; F]?$Q'U  
 for(int index=0;index<MAX_KEY;index++){ A1f]HT  
  if(hCallWnd[index]==0){ +CNRSq"  
   hCallWnd[index]=hWnd; I.e'  
   HotKey[index]=cKey; a^5`fA/L,  
   HotKeyMask[index]=cMask; E(U}$Zey  
   bAdded=TRUE; ddHIP`wb  
   KeyCount++; qkUr5^1  
   break; ^! ZjK-$A<  
  } qc'tK6=jp  
 } |I+E`,n"b  
 return bAdded; y!!+IeReS  
} gkk< -j'  
n8G#TQrAE  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 5\Y/so=  
{ 0_D~n0rq,v  
 BOOL bRemoved=FALSE; ,n!xzoX_  
 for(int index=0;index<MAX_KEY;index++){ Yhw* `"X  
  if(hCallWnd[index]==hWnd){ {Rj'=%h  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ _@prv7e  
    hCallWnd[index]=NULL; o>`/,-!  
    HotKey[index]=0; mQs'2Y6Oa  
    HotKeyMask[index]=0; JcVq%~ {M  
    bRemoved=TRUE; HIa$0g0J  
    KeyCount--; Em"X5>;4  
    break; '/ &"  
   } T*T.\b  
  } Z%OSW  
 } >;3c; nf  
 return bRemoved; 4QZy-a*tA  
} B?%D   
j'J*QK&Q  
void VerifyWindow() VYAe !{[  
{ B=c^ma  
 for(int i=0;i<MAX_KEY;i++){  B-gr2-  
  if(hCallWnd!=NULL){ 3MzY]J y(  
   if(!IsWindow(hCallWnd)){ dw4)4_  
    hCallWnd=NULL; _gGy(`  
    HotKey=0; ? sewU9*  
    HotKeyMask=0; L2h+[f  
    KeyCount--; 99:L#0!.W  
   } oV!9B-<  
  } 5~"=Fm<uD  
 }  zm.2L  
} 86I*  
Hf-F-~E  
BOOL CHookApp::InitInstance() u ?Xku8 1l  
{ zn~m;0Xi  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); v1lj/A  
 hins=AfxGetInstanceHandle(); P%lLKSA  
 InitHotkey(); T?ZMmUE  
 return CWinApp::InitInstance(); 6e*b;{d  
} /(0d{  
E37@BfpO3  
int CHookApp::ExitInstance() &L?Dogo  
{ &sRJ'oc  
 VerifyWindow(); \~H"!vj  
 UnInit(); Bm7GU`j"  
 return CWinApp::ExitInstance(); -?'CUm*Od  
} "}EbA3  
f\^QV  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file E{ ,O}  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) an2Tc*=~l(  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Vi|jkyC8  
#if _MSC_VER > 1000 m#eD v*  
#pragma once yEny2q}  
#endif // _MSC_VER > 1000 -&A[{m<,>  
G9[-|[j^N  
class CCaptureDlg : public CDialog Jr9}'l8  
{ {LeEnh-  
 // Construction  k WtUj  
 public: >dl!Ep  
  BOOL bTray; eBV{B70k  
  BOOL bRegistered; 7| T:TbY>  
  BOOL RegisterHotkey(); ^Bb_NcU  
  UCHAR cKey; HW G~m:km  
  UCHAR cMask; S_CtE M  
  void DeleteIcon(); vSA%A47G  
  void AddIcon(); 8#Z5-",iw  
  UINT nCount; HKkf+)%)x  
  void SaveBmp(); VfwD{+ 5  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor V"ZbKV +[  
  // Dialog Data Uk2q,2  
  //{{AFX_DATA(CCaptureDlg) %E\%nTV  
  enum { IDD = IDD_CAPTURE_DIALOG }; kt#W~n  
  CComboBox m_Key; |Q;o538  
  BOOL m_bControl; GXRjR\Ch  
  BOOL m_bAlt; \d+HYLAJn  
  BOOL m_bShift; bH{aI:9Fb  
  CString m_Path; c" 7pf T  
  CString m_Number; hrD6r=JT<~  
  //}}AFX_DATA ka3 Z5  
  // ClassWizard generated virtual function overrides 20qVzXi  
  //{{AFX_VIRTUAL(CCaptureDlg) [VW;L l  
 public: k I~]u  
  virtual BOOL PreTranslateMessage(MSG* pMsg); \G@6jn1G(  
 protected: SA1/U  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support G~L?q~b  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); `RcNqPY#S  
  //}}AFX_VIRTUAL 3>" h*U#  
  // Implementation U;GoC$b}|  
 protected: (<Xdj^v  
  HICON m_hIcon; C(|5,P#5  
  // Generated message map functions h12wk2@P/]  
  //{{AFX_MSG(CCaptureDlg) U08?*{  
  virtual BOOL OnInitDialog(); C#&6p0U  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); h$k3MhYDes  
  afx_msg void OnPaint(); *"\Q ~#W  
  afx_msg HCURSOR OnQueryDragIcon(); J#DcT@  
  virtual void OnCancel(); HJR<d&l;p  
  afx_msg void OnAbout(); {UBQ?7.jE  
  afx_msg void OnBrowse(); Bedjw =B  
  afx_msg void OnChange(); ]P$DAi   
 //}}AFX_MSG <\g&%c,   
 DECLARE_MESSAGE_MAP() ~,68S^nP)H  
}; @t8kN6.  
#endif O97bgj]  
})lT fy  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file w WU_?Dr_~  
#include "stdafx.h" i t@}dZ  
#include "Capture.h" Y0\\(0j64  
#include "CaptureDlg.h" I JY5wP1"  
#include <windowsx.h> i q:Q$z&  
#pragma comment(lib,"hook.lib") ^u!Tyb8Dk  
#ifdef _DEBUG Q;O)>K  
#define new DEBUG_NEW ~x"79=!W  
#undef THIS_FILE Rl4zTAI  
static char THIS_FILE[] = __FILE__; OX/.v?c  
#endif PX2k,%  
#define IDM_SHELL WM_USER+1 _ D9@<+MS*  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); \_AEuz3 F  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &AcFa<U  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Gc!8v}[7J  
class CAboutDlg : public CDialog s;7qNwYO  
{ %*c|[7Z~V  
 public: (iOCzZ6S  
  CAboutDlg(); /^ 3oq]  
  // Dialog Data IW o~s  
  //{{AFX_DATA(CAboutDlg) BemkCj2  
  enum { IDD = IDD_ABOUTBOX }; "%Ana=cc  
  //}}AFX_DATA m%c0#=D  
  // ClassWizard generated virtual function overrides F}(QKO*  
  //{{AFX_VIRTUAL(CAboutDlg) n E}<e:  
 protected: Ygi1"X}  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support FP'lEp  
  //}}AFX_VIRTUAL ,Kf8T9z`  
  // Implementation -wQ^oOJ  
 protected: J%:/<uCmZ  
  //{{AFX_MSG(CAboutDlg) 4)+IO;  
  //}}AFX_MSG %Rep6=K*$  
  DECLARE_MESSAGE_MAP() p <=%  
}; !NLvo_[Y  
QlYs7zZ  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) SWjQ.aM  
{ Q!Ow{(|  
 //{{AFX_DATA_INIT(CAboutDlg) ~po%GoH(K  
 //}}AFX_DATA_INIT Va Yu%  
} &^n> ZY,  
rk,1am:cg  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) g~c|~u(W  
{ Tj21YK.mk  
 CDialog::DoDataExchange(pDX); 3E}NiD\V}  
 //{{AFX_DATA_MAP(CAboutDlg) j8Q5d`  
 //}}AFX_DATA_MAP E< CxKY9  
} mzE$aFu8  
Mq :'-`  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) OZ'.}((?n  
 //{{AFX_MSG_MAP(CAboutDlg) H<Kkj  
 // No message handlers #} ~p^ 0  
 //}}AFX_MSG_MAP ).}k6v[4)  
END_MESSAGE_MAP() BU:Ecchbr  
n R\n\   
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Sci4EGc  
: CDialog(CCaptureDlg::IDD, pParent) Wx?&igh  
{ Cld<D5\|f+  
 //{{AFX_DATA_INIT(CCaptureDlg) 8| e$  
  m_bControl = FALSE; 9;]wF8h  
  m_bAlt = FALSE; 5Z6-R}uXk  
  m_bShift = FALSE; MkW1FjdP  
  m_Path = _T("c:\\"); { w8 !K  
  m_Number = _T("0 picture captured."); W `u$7k]$  
  nCount=0;  =Etwa  
  bRegistered=FALSE; |5~wwL@LW7  
  bTray=FALSE; f']sU/c=  
 //}}AFX_DATA_INIT ri<'-wi  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 df>kEvU5.^  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); |Sr\jUIWn  
} 3 "l F  
K)Zkj"y  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Z?(4%U5z  
{ BLwfm+ m"  
 CDialog::DoDataExchange(pDX); r'd:SaU+  
 //{{AFX_DATA_MAP(CCaptureDlg) <,@H;|mZ  
  DDX_Control(pDX, IDC_KEY, m_Key); &*aer5?`  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); y Tw',N{  
  DDX_Check(pDX, IDC_ALT, m_bAlt); w.D4dv_H  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 'l' X^LMD  
  DDX_Text(pDX, IDC_PATH, m_Path); 0n*rs=\VG  
  DDX_Text(pDX, IDC_NUMBER, m_Number); V Z2.w4b  
 //}}AFX_DATA_MAP Bzu(XQ  
} /1 US,  
pymx\Hd,  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 4ypRyO  
//{{AFX_MSG_MAP(CCaptureDlg) R2N^'  
 ON_WM_SYSCOMMAND() 13.{Y)  
 ON_WM_PAINT() bk7^%O>  
 ON_WM_QUERYDRAGICON() &gWMl`3^*!  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) @TA8^ND  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 3q#"i&  
 ON_BN_CLICKED(ID_CHANGE, OnChange) z[qdmx^  
//}}AFX_MSG_MAP ?-8y4 Ex  
END_MESSAGE_MAP() "J P{Q  
>HcYVp~G  
BOOL CCaptureDlg::OnInitDialog() TwM1M["3  
{ d<^_w!4X}  
 CDialog::OnInitDialog(); QJ a4R  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); hGed/Yr  
 ASSERT(IDM_ABOUTBOX < 0xF000); Nt zq"ces)  
 CMenu* pSysMenu = GetSystemMenu(FALSE); QT1:> k  
 if (pSysMenu != NULL) l5=u3r9WYC  
 { GB<R7 J  
  CString strAboutMenu; zP :~O  
  strAboutMenu.LoadString(IDS_ABOUTBOX); e{fZ}`=7y  
  if (!strAboutMenu.IsEmpty()) W>Mse[6`c  
  { \;-=ODC  
   pSysMenu->AppendMenu(MF_SEPARATOR); J4gI=@e  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); *|];f#^9  
  } \|eJJC  
 } r7Nu>[r5  
 SetIcon(m_hIcon, TRUE); // Set big icon j6tP)f^tD  
 SetIcon(m_hIcon, FALSE); // Set small icon 1Q&cVxA"\  
 m_Key.SetCurSel(0); j`2B}@2  
 RegisterHotkey(); MV0<^/p|  
 CMenu* pMenu=GetSystemMenu(FALSE); 4ef*9|^x#  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); .Lojzx  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 20rN,@2<  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); n> MD\ZS  
 return TRUE; // return TRUE unless you set the focus to a control ZR/R'prW  
} ATMc`z:5T  
jOBY&W0r  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) hz< |W5  
{ ulH0%`Fi  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) V.;:u#{@-Q  
 { M4TrnZ1D}  
  CAboutDlg dlgAbout; qs!>tw  
  dlgAbout.DoModal(); kF+ZW%6N  
 } ra]!4Kd'  
 else EvwbhvA(  
 { 0=OD?48<  
  CDialog::OnSysCommand(nID, lParam); E x_L!9>!  
 } D^,\cZbY  
} M'\pkzx  
CxJfrI_W  
void CCaptureDlg::OnPaint() pNp^q/- yB  
{ J3H.%m!V  
 if (IsIconic()) [zY!'cz?  
 { QjQ4Z'.r>  
  CPaintDC dc(this); // device context for painting |yLk5e~@-  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); i[^k.W3gf  
  // Center icon in client rectangle 1KW3l<v-6  
  int cxIcon = GetSystemMetrics(SM_CXICON); sL)Rg(rkx  
  int cyIcon = GetSystemMetrics(SM_CYICON); 5{')GTdX>  
  CRect rect; "w*@R8v  
  GetClientRect(&rect); shM{Y9~O9&  
  int x = (rect.Width() - cxIcon + 1) / 2; =MMCf0  
  int y = (rect.Height() - cyIcon + 1) / 2; HS{P?~:=U  
  // Draw the icon (JevHdI*V  
  dc.DrawIcon(x, y, m_hIcon); cICHRp&&  
 } S\B5&W  
 else S&n[4*  
 { q z=yMIy=  
  CDialog::OnPaint(); &c20x+  
 }  "\`>2  
} "VV914*z  
Ip>^O/}$1  
HCURSOR CCaptureDlg::OnQueryDragIcon() 9U]pH%.9  
{ NeY"6!;k  
 return (HCURSOR) m_hIcon; ;)gLjF/F7  
} 5+`=t07^et  
}W1^t  
void CCaptureDlg::OnCancel() LlU' _}>  
{ '#H&:Htm;L  
 if(bTray) {b(rm,%  
  DeleteIcon(); ?LM:RADCm  
  CDialog::OnCancel(); h>dxBN  
} ]yo_wGiwY  
F\JLbY{x]  
void CCaptureDlg::OnAbout() +q7qK*  
{ b 1cd&e  
 CAboutDlg dlg; V{KjRSVf=  
 dlg.DoModal(); V R"8Di&)  
} . /Y&\<  
P2>:p%Z  
void CCaptureDlg::OnBrowse() zgK;4 22$m  
{ "s% 686Vz  
 CString str; B jYOfu'~z  
 BROWSEINFO bi; H;qJH1EdD  
 char name[MAX_PATH]; )+?HI^-[S  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); i9KTX%s5^  
 bi.hwndOwner=GetSafeHwnd(); ?k"0w)8  
 bi.pszDisplayName=name; Ax f^hBP  
 bi.lpszTitle="Select folder"; L4~ W/6A  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; M]1;  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); &1=g A.ZR  
 if(idl==NULL) t{~@I  
  return; Hv3W{|  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); (e(Rr 4  
 str.ReleaseBuffer(); HQl~Dh0DJ  
 m_Path=str; I:nI6gF  
 if(str.GetAt(str.GetLength()-1)!='\\') O5O.><RP  
  m_Path+="\\"; 4X*Q6rW  
 UpdateData(FALSE); Uh*@BmDA  
} {f-XyF1`  
+Jdm #n?_  
void CCaptureDlg::SaveBmp() ~*,Wj?~+7  
{ o,J^ e_  
 CDC dc; 0F1u W>D1  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 0#<WOns1   
 CBitmap bm; GJvp{U}y9I  
 int Width=GetSystemMetrics(SM_CXSCREEN); n_J5zQJ  
 int Height=GetSystemMetrics(SM_CYSCREEN); Jns/v6  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ]Ym=+lgi  
 CDC tdc;  b)Tl*  
 tdc.CreateCompatibleDC(&dc); >zFD $  
 CBitmap*pOld=tdc.SelectObject(&bm); B_cgWJ*4  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); :Z[(A"dA  
 tdc.SelectObject(pOld); 6i| ~7md,  
 BITMAP btm; ! j{CuA/  
 bm.GetBitmap(&btm); iyc$)"w  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; O)`Gzx*ShU  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); v[VC2D  
 BITMAPINFOHEADER bih; e]+7DE  
 bih.biBitCount=btm.bmBitsPixel; w [L&*  
 bih.biClrImportant=0; 1#]B^D  
 bih.biClrUsed=0; O~atNrHD  
 bih.biCompression=0; 7u|%^Ao6  
 bih.biHeight=btm.bmHeight; {d,?bs)  
 bih.biPlanes=1; \TZ|S,FS  
 bih.biSize=sizeof(BITMAPINFOHEADER); bH,M,xIL2  
 bih.biSizeImage=size; -8/JP  
 bih.biWidth=btm.bmWidth; rfc|`*m}0  
 bih.biXPelsPerMeter=0; K>$qun?5  
 bih.biYPelsPerMeter=0; lQWBCJ8y  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); u (AA`S"  
 static int filecount=0; ^iuo^2+  
 CString name; D&-vq,c  
 name.Format("pict%04d.bmp",filecount++); u3ST;  
 name=m_Path+name; H~eGgm;p  
 BITMAPFILEHEADER bfh; 94y9W#  
 bfh.bfReserved1=bfh.bfReserved2=0; 6P^hN%0  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ~pRs-  
 bfh.bfSize=54+size; *t]v}ZV*  
 bfh.bfOffBits=54; "Vx6 #u@}  
 CFile bf; }1Z6e[K?  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ \+9;!VWhl  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); JL``iA  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); c@9##DPn  
  bf.WriteHuge(lpData,size); Ok,HD7  
  bf.Close(); n>S2}y  
  nCount++; bM^7g  
 } ~3d*b8  
 GlobalFreePtr(lpData); zQ_z7FJCB  
 if(nCount==1) 9*DEv0}a^  
  m_Number.Format("%d picture captured.",nCount); 5x2L(l-2  
 else yuv4*  
  m_Number.Format("%d pictures captured.",nCount); "|hlDe<  
  UpdateData(FALSE); 8+ hhdy*b  
} ` .$&T7  
14-]esSa  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) dWUUxKC  
{ h9jc,X u5X  
 if(pMsg -> message == WM_KEYDOWN) Sk$KqHX(  
 { Fv A8T 2-v  
  if(pMsg -> wParam == VK_ESCAPE) J)KnE2dw5  
   return TRUE; ;Gh>44UM[  
  if(pMsg -> wParam == VK_RETURN) {:$NfW  
   return TRUE; XfDX:b1p  
 } M9DgO4xl  
 return CDialog::PreTranslateMessage(pMsg); ?M~  k$  
} Se Oy7  
D7gHE  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ]VDn'@uM  
{ (gU2"{:]J  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ]w-.|vx  
  SaveBmp(); F 3s?&T)[G  
  return FALSE; Mt=R*M}D0  
} {[tZ.1.w  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ #Z0-8<\  
 CMenu pop; :X Lp  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); K[]K53Nk  
 CMenu*pMenu=pop.GetSubMenu(0); &Sa~/!M  
 pMenu->SetDefaultItem(ID_EXITICON); 7D9]R#-K  
 CPoint pt; ]Zk}ZG>6  
 GetCursorPos(&pt); o[^Q y(2~  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); -yl;3K]l  
 if(id==ID_EXITICON) }uiPvO+&p  
  DeleteIcon(); P7UJ-2%Y+  
 else if(id==ID_EXIT) *uU4^E(  
  OnCancel(); y;QQ| =,  
 return FALSE; B:nK)"{  
} M $uf:+F  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); A%n?}  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) I)lC{v  
 AddIcon(); NNp}|a9  
 return res; _#vGs:-x&  
} ^)<w*iqBD  
SBL+e]P  
void CCaptureDlg::AddIcon() ?Sw /(}|m  
{ !-,Ww[G>  
 NOTIFYICONDATA data; +A\V)  
 data.cbSize=sizeof(NOTIFYICONDATA); q:8\ e  
 CString tip; K_&_z  
 tip.LoadString(IDS_ICONTIP); vpV$$=Qwp  
 data.hIcon=GetIcon(0); &F`L}#oL&  
 data.hWnd=GetSafeHwnd(); y!5:dvt  
 strcpy(data.szTip,tip); $L\@da?  
 data.uCallbackMessage=IDM_SHELL; AqqHD=Yp  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; yW`e |!  
 data.uID=98; R{`gR"*  
 Shell_NotifyIcon(NIM_ADD,&data); QTE:K?  
 ShowWindow(SW_HIDE); I^:F)a:  
 bTray=TRUE; bRsc-Fz6  
} ;W~4L+e  
~ k<SbFp  
void CCaptureDlg::DeleteIcon() U{HML|  
{ xW0Z'==  
 NOTIFYICONDATA data; x?=B\8m  
 data.cbSize=sizeof(NOTIFYICONDATA); }AJ L,Q7q  
 data.hWnd=GetSafeHwnd(); 1daL y  
 data.uID=98; -=sf}4A  
 Shell_NotifyIcon(NIM_DELETE,&data); Q1]Wo9j  
 ShowWindow(SW_SHOW); X  Ny Y$  
 SetForegroundWindow(); ZRP y~wy>  
 ShowWindow(SW_SHOWNORMAL); j.B>v\b_3  
 bTray=FALSE;  J `x}{K  
} 3Y(9\}E@`  
ofK='G .  
void CCaptureDlg::OnChange() hLo>R'@uN  
{ T]uKH29.%  
 RegisterHotkey(); `-u7 I  
} :*cHA  
ThiN9! Y  
BOOL CCaptureDlg::RegisterHotkey() B%mtp;) P  
{ D:)~%wu Lt  
 UpdateData(); OEI3eizgH  
 UCHAR mask=0; XR+rT  
 UCHAR key=0; 9t0Cj/w}  
 if(m_bControl) ` yYvYc  
  mask|=4; :cdQ(O.m  
 if(m_bAlt) y+RRg[6|  
  mask|=2; 506V0]`/  
 if(m_bShift) F1J#Y$q~L  
  mask|=1; IX.sy  
  key=Key_Table[m_Key.GetCurSel()]; V]m^7^m3  
 if(bRegistered){ - f 4>MG  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); !xymoiArp  
  bRegistered=FALSE; I{EIHD<  
 } ?b"Vj+1:x  
 cMask=mask; m/{Y]D{2  
 cKey=key; ,ex]$fQ'  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ,jTPg/r  
 return bRegistered; }_]As}E  
} #fN/LO  
!-ZP*V3}h  
  四、小结 1@@y]s_.a  
sS|<&3  
  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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