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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: hJ#xB6  
  gH7|=W  
  一、实现方法 LRG6:&  
s)Cjc.Qs  
  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: -FQ 'agf@&  
zXxT%ZcCj  
#pragma data_seg("shareddata") B[-v[K2  
HHOOK hHook =NULL; //钩子句柄 |:<f-j7t~  
UINT nHookCount =0; //挂接的程序数目 !|S43i&p  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 I \JGs@I   
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 s^uS1  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey o;R2p $  
static int KeyCount =0; .:QLk&a,:,  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 }\:Nu Tf  
#pragma data_seg() 0C6-GKbZ  
.KUv( -  
  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。 1gy.8i  
7.#F,Ue_0T  
  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: r^a7MHY1  
o-OHjFfB  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR '>0fWBs  
cKey,UCHAR cMask) {|:;]T"y  
{ ^R Fp8w(  
 BOOL bAdded=FALSE; (/j/>9iro  
 for(int index=0;index<MAX_KEY;index++){ c+$*$|t=v`  
  if(hCallWnd[index]==0){ Ix=}+K/  
   hCallWnd[index]=hWnd; YccH+[X;  
   HotKey[index]=cKey; #[~pD:qqM  
   HotKeyMask[index]=cMask; 9-DZU,`P  
   bAdded=TRUE; [knN:{ l  
   KeyCount++; /+;h)3PN6  
   break; &*G #H~\  
  } 9:1Q1,-i!-  
 } QpA/SmJ  
 return bAdded; ( _)jkI \  
} Te wb?:  
//删除热键 a$"Hvrj  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) R:k5QD9/&p  
{ N@1+O,o  
 BOOL bRemoved=FALSE; oxkoA  
 for(int index=0;index<MAX_KEY;index++){ 1Y@Aixx  
  if(hCallWnd[index]==hWnd){ Qqvihd  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ W!&'pg  
    hCallWnd[index]=NULL; f@DYN!Z_m  
    HotKey[index]=0; 48qV >Gwf  
    HotKeyMask[index]=0; &c:Ad% z  
    bRemoved=TRUE; #( jw!d&  
    KeyCount--; ,5, !es@`b  
    break; u\{ g(li-I  
   } =L:4i\4  
  } 2h1C9n%j9  
 } 87P>IO  
 return bRemoved; M#VE]J  
} JB`\G=PiL  
<55 g3>X  
6%Pdy$ P  
  DLL中的钩子函数如下: Vz~nT  
(Cd\G=PK  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) J/GSceHF  
{ s4SG[w!d  
 BOOL bProcessed=FALSE; 9qz6]-K  
 if(HC_ACTION==nCode) a]/>ra5{  
 { vbBc}G"w  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 FCuB\ Q  
   switch(wParam) \r,Q1n?7  
   {  Rh{zH~oZ  
    case VK_MENU: 7-T{a<g  
     MaskBits&=~ALTBIT; A1#%`^W9  
     break; sq[iY  
    case VK_CONTROL: x`mN U  
     MaskBits&=~CTRLBIT; {{MRELipW  
     break; DRgTe&+  
    case VK_SHIFT: ul2")HL];  
     MaskBits&=~SHIFTBIT; &twf,8  
     break; PGBQn#c<  
    default: //judge the key and send message ;YX4:OBqr  
     break;  }'/`2!lY  
   } I'iGt~4$  
   for(int index=0;index<MAX_KEY;index++){ 0_"fJ~Y^J  
    if(hCallWnd[index]==NULL) *c*0PdV  
     continue; /fT+^&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (+3Wgl+]/  
    { xAe~]k_D  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); SNE#0L' }  
     bProcessed=TRUE; V8-oYwOR  
    } wK-3+&,9  
   } z3M6V}s4  
  } w1"nffhO  
  else if((lParam&0xc000ffff)==1){ //有键按下 %r6y ;vAf  
   switch(wParam) xA$nsZ]  
   { l0cA6b  
    case VK_MENU: ~-m"   
     MaskBits|=ALTBIT; \z7SkZt,GT  
     break; rT5Ycm@  
    case VK_CONTROL: 9Z'8!$LYg  
     MaskBits|=CTRLBIT; a@*S+3  
     break; 2e9es  
    case VK_SHIFT: !PJ6%"  
     MaskBits|=SHIFTBIT; S.q].a  
     break; ct,l^|0Hu8  
    default: //judge the key and send message WjwLM2<nK7  
     break; Ii_ojQP-z  
   } 88h3|'*  
   for(int index=0;index<MAX_KEY;index++){ ),!;| bh  
    if(hCallWnd[index]==NULL) F[[TWf/  
     continue; 5~WGZc  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) u[/m|z  
    { q]N:Tpm9  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); D{4YxR PX  
     bProcessed=TRUE; [$"n^5_~  
    } pV,P|>YTf  
   } GJp85B!PlO  
  } (tGY%oT"  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 P(73!DT+  
   for(int index=0;index<MAX_KEY;index++){ oK%K}{`  
    if(hCallWnd[index]==NULL) hcbv;[bG  
     continue; A\#P*+k0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) o b|BXF  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Y +\%  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 y K2^Y]Ku?  
   } '@CR\5 @  
  } iVTGF<  
 } ^=SD9V  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 15o?{=b[  
} d[^~'V  
-s$F&\5by  
  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: QtqfG{  
0,rTdjH7  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 'X !?vK^]p  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Bv. `R0e&  
`z )N,fF  
  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: vp crPVA^  
@%lBrM  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) UaViI/ks  
{ { TRsd  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) e$uiJNS2  
 { UNi`P9D]3  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 GS Q/NYK  
  SaveBmp(); SdwS= (e6  
  return FALSE; %8M)2 ?E  
 } Io|Aj  
 …… //其它处理及默认处理 0{PzUIM,W  
} n[,w f9  
t2iv(swTe  
~~,rp) )  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 yxq}QSb \3  
IMl!,(6;  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 (q7 Ry4-  
\7 NpT}dj  
  二、编程步骤 U(;&(W"M  
aCxE5$~$  
  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"; LtKI3ou  
\ y{Tn@7  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; T=:]]nf?M  
)Cw`"n  
  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; ;kJA'|GX  
i^!ez5z  
  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; &"mzwQX  
Q;J`Q wkH  
  5、 添加代码,编译运行程序。 6q6FB  
%F*|;o7s  
三、程序代码 *d',Vuv&[  
d'Axum@  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL u}|%@=xn  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) >xn}N6Rj2~  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ulJX1I=|p  
#if _MSC_VER > 1000 n%\ /J  
#pragma once AVU>+[.=%c  
#endif // _MSC_VER > 1000 hw~a:kD  
#ifndef __AFXWIN_H__ yj(vkifEB  
#error include 'stdafx.h' before including this file for PCH ^@_m "^C  
#endif +/;*|  
#include "resource.h" // main symbols @Ehn(}  
class CHookApp : public CWinApp a`u S[r>  
{ 'iY*6<xS<  
 public: 34R!x6W0  
  CHookApp(); zPKr/  
  // Overrides e~T@~(fft  
  // ClassWizard generated virtual function overrides C}*cx$.  
  //{{AFX_VIRTUAL(CHookApp) nPgeLG"00  
 public: 7 #=}:3c  
  virtual BOOL InitInstance(); A=-F,=k(!/  
  virtual int ExitInstance(); gxGrspqg  
  //}}AFX_VIRTUAL kz S=g|_  
  //{{AFX_MSG(CHookApp) ^v@4|E$  
  // NOTE - the ClassWizard will add and remove member functions here. F("#^$  
  // DO NOT EDIT what you see in these blocks of generated code ! [|3>MZ2/  
  //}}AFX_MSG 92'wkS  
  DECLARE_MESSAGE_MAP() KYxBVgJ  
}; @i3bgx>_o  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 9r2IuS0  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $.489x+'Z  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); xT)psM'CL  
BOOL InitHotkey(); <p?&udqD  
BOOL UnInit();  X}6#II  
#endif *$M'`vj:  
V8~jf-\$b  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Sj(F3wY  
#include "stdafx.h" STA4 p6  
#include "hook.h" ='E$-_  
#include <windowsx.h> oQj=;[  
#ifdef _DEBUG Ij'NC C  
#define new DEBUG_NEW KZBrE$@%5  
#undef THIS_FILE do ^RF<G  
static char THIS_FILE[] = __FILE__; :` $@}GI  
#endif m2Uc>S  
#define MAX_KEY 100 3?s ?XAh  
#define CTRLBIT 0x04 Bfv.$u00p  
#define ALTBIT 0x02 U^Tp6vN d  
#define SHIFTBIT 0x01 Pu>N_^  C  
#pragma data_seg("shareddata") T/P7F\R  
HHOOK hHook =NULL; d'9:$!oz  
UINT nHookCount =0; 9><mp]E4  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey r CRgzC  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT >uI$^y1D  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey i NWC6y  
static int KeyCount =0; Sb:T*N0gS  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift I6LD)?  
#pragma data_seg() SgE/!+{  
HINSTANCE hins; L{ymI) Y^  
void VerifyWindow(); efuK  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) EC?Efc+O  
//{{AFX_MSG_MAP(CHookApp) gK3Mms]}m  
// NOTE - the ClassWizard will add and remove mapping macros here. K$REZe  
// DO NOT EDIT what you see in these blocks of generated code! s-V SH  
//}}AFX_MSG_MAP fH8!YQG8$  
END_MESSAGE_MAP() &VWlt2-R0h  
Cv=GZGn-  
CHookApp::CHookApp() ~L+]n0*  
{ ^Dx#7bsDZR  
 // TODO: add construction code here, ]wuy_+$  
 // Place all significant initialization in InitInstance +TRy:e  
} `$z)$VuP  
zSjgx_#U  
CHookApp theApp; -&[z\"T  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) K.SeK3(  
{ y^FOsr  
 BOOL bProcessed=FALSE; '?Iif#Z1  
 if(HC_ACTION==nCode) <V_7|)'/A  
 { >AI<60/<  
  if((lParam&0xc0000000)==0xc0000000){// Key up *N/hc  
   switch(wParam) ad`_>lA4Lp  
   { Pcu|k/tk  
    case VK_MENU: lz~J"$b  
     MaskBits&=~ALTBIT; s([Wn)I  
     break; <2P7utdZ  
    case VK_CONTROL: )8{6+{5lu  
     MaskBits&=~CTRLBIT; j:1uP^.  
     break; =`I?mn&  
    case VK_SHIFT: 3,.% s  
     MaskBits&=~SHIFTBIT; -0,4eg j3  
     break; Dr"/3xm  
    default: //judge the key and send message mPVE?jnR^0  
     break; ".2A9]_s  
   } 4^!4eyQ^  
   for(int index=0;index<MAX_KEY;index++){ w&lZ42(mF  
    if(hCallWnd[index]==NULL) 5su.+4z\  
     continue; f(u&XuZ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) vg8O] YF  
    { BEw{X|7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 5z]\$=TE  
     bProcessed=TRUE; $ehg@WK}.  
    } v29G:YQe  
   } Ud3""C5B  
  } N5 q725zJ  
  else if((lParam&0xc000ffff)==1){ //Key down ZcZ;$*  
   switch(wParam) j.QHkI1.  
   { z*.v_Mx  
    case VK_MENU: "j Zm0U$,*  
     MaskBits|=ALTBIT; Qm);6X   
     break; cj(X2L  
    case VK_CONTROL: f:%SW  
     MaskBits|=CTRLBIT; "]]q} O?  
     break; GF R!n1Hv  
    case VK_SHIFT: FWTx&Ip  
     MaskBits|=SHIFTBIT; MtG_9-  
     break; +(ny|r[#  
    default: //judge the key and send message p~bkf>  
     break; 3B,QJ&  
   } o?!uX|Fy  
   for(int index=0;index<MAX_KEY;index++) 0MpS4tW0=  
   { ~+m,im8}  
    if(hCallWnd[index]==NULL) 9)Yw :  
     continue; 6D9o08  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) E8tD)=1  
    { y-cw~kNPP3  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); /{G/|a  
     bProcessed=TRUE; YhgUCF#  
    } d1NE%hg3  
   } z`'P>.x   
  } A ^B@VuK  
  if(!bProcessed){ s-Y+x  
   for(int index=0;index<MAX_KEY;index++){ A! ;meVUs  
    if(hCallWnd[index]==NULL) MCAXt1sL&E  
     continue; Wg1tip8s  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ${e&A^h  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ~R!gJTO9  
   } #K`B<2+T  
  } Bz]J=g7  
 } $GF&x>]]  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); HIPL!ss]  
} kGD|c=K}  
mG}k 3e-  
BOOL InitHotkey() /;+,mp4  
{ :GM#&*$2<  
 if(hHook!=NULL){ *tAqt2{48  
  nHookCount++; =8S}Iat  
  return TRUE; 1b `G2?%  
 } &PWf:y{R`  
 else x<Se>+  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); {Tx 3$eU  
  if(hHook!=NULL) K.h]JD]o  
   nHookCount++; /'Bdq?!B&  
  return (hHook!=NULL); $SF3odpt  
} Th+|*=Il  
BOOL UnInit() HWR& C  
{ T{~MiC6A  
 if(nHookCount>1){ 0|Q.U  
  nHookCount--; jf7pl8gv  
  return TRUE; Y\>\[*.v  
 } !47A$sQ  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 'WzUu MCx  
 if(unhooked==TRUE){ Q=XA"R  
  nHookCount=0; $9m5bQcV  
  hHook=NULL; htg'tA^CtS  
 } <tQXK;  
 return unhooked; 0nT%Slbih  
} TA9dkYlE/  
YUS?]~XC7x  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 165WO}(;/  
{ 2HVCXegq  
 BOOL bAdded=FALSE; |lHFo{8"  
 for(int index=0;index<MAX_KEY;index++){ $Q,n+ /  
  if(hCallWnd[index]==0){ n% U9iwJ.  
   hCallWnd[index]=hWnd; UNY@w=]<  
   HotKey[index]=cKey; k7b(QADqUU  
   HotKeyMask[index]=cMask; 7C YH'DL  
   bAdded=TRUE; rUvwpP"k  
   KeyCount++; 2q|_Dma  
   break; _"v~"k 90^  
  } :28@J?jjO  
 } S `wE$so>  
 return bAdded; S r[IoF)  
} 9 G((wiE  
z.A4x#>-  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) k2wBy'M .'  
{ &{hc   
 BOOL bRemoved=FALSE; (mY(\mu}  
 for(int index=0;index<MAX_KEY;index++){ -|$*l Q  
  if(hCallWnd[index]==hWnd){ e Ri!\Fx  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 1+FYjh!2t  
    hCallWnd[index]=NULL; @p"NJx"  
    HotKey[index]=0; hF9B?@n?B  
    HotKeyMask[index]=0; 1 S^'C2/b  
    bRemoved=TRUE; ,^M]yr*~  
    KeyCount--; {z-NlH  
    break; }7&\eV{qU  
   } 4Z],+?.[  
  } H7J`]nr6  
 } $TFTIk*uU  
 return bRemoved; lWIv(%/@  
} @#1cx  
tc5M$b3^2  
void VerifyWindow() AtuZF  
{ wbl ${@4  
 for(int i=0;i<MAX_KEY;i++){ 8\P JSr  
  if(hCallWnd!=NULL){ i:R!T,  
   if(!IsWindow(hCallWnd)){ U=M#41J  
    hCallWnd=NULL; 2kC^7ZAwu  
    HotKey=0; [gTQ-  
    HotKeyMask=0; }3Df]  
    KeyCount--; jf2y0W>6s  
   } 8R BDJ  
  } enWF7`  
 } [3GKPX:OA/  
} $To 4dJb  
1k0^6gE|  
BOOL CHookApp::InitInstance() IBzHR[#,^  
{ O5c_\yv=  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); EP/&m|o|G  
 hins=AfxGetInstanceHandle(); uFMs ^^#  
 InitHotkey(); a =9vS{  
 return CWinApp::InitInstance(); o&WRta>VP  
} GsR-#tV@  
a\.//?  
int CHookApp::ExitInstance() @ 8A{ 9i  
{ Hu[8HzJo  
 VerifyWindow(); r .{rNR  
 UnInit(); u;$I{b@M]  
 return CWinApp::ExitInstance(); e1:u1(".  
} a"MTQFm'  
Cl%V^xTb  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file "<7$2!  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) nm<L&11  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ p, !1 3X  
#if _MSC_VER > 1000 (Be$$W  
#pragma once R %Rv  
#endif // _MSC_VER > 1000 N=hSqw[  
3`mC"a b /  
class CCaptureDlg : public CDialog ?< -wHj)  
{ =mDy@%yx!  
 // Construction IJ+O),'  
 public: ~:R4))qpg  
  BOOL bTray; mxtlr)  
  BOOL bRegistered; Rc;1Sm9\  
  BOOL RegisterHotkey(); -Mit$mFn  
  UCHAR cKey; r[Zg 2  
  UCHAR cMask; {\ A_%  
  void DeleteIcon(); ^[k6]1h  
  void AddIcon(); K'>P!R:El  
  UINT nCount; l!xgtP K  
  void SaveBmp(); IEKMa   
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor C!CaGf=  
  // Dialog Data Fmy1nZ   
  //{{AFX_DATA(CCaptureDlg) O8!!UA8V  
  enum { IDD = IDD_CAPTURE_DIALOG }; l#mqV@?A~  
  CComboBox m_Key; JDIz28Ww  
  BOOL m_bControl; 8 ))I$+  
  BOOL m_bAlt; Ir'DA_..  
  BOOL m_bShift; *Cc$eR]-  
  CString m_Path; O e0KAn  
  CString m_Number; OJh+[bf"  
  //}}AFX_DATA w@<<zItSo  
  // ClassWizard generated virtual function overrides {"qW~S90YO  
  //{{AFX_VIRTUAL(CCaptureDlg) V3aY]#Su  
 public: B3ohHxHu  
  virtual BOOL PreTranslateMessage(MSG* pMsg); D'U\]'.  
 protected: +H5 jRw  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support F#zQQ)(Pf  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Fj[ dO&  
  //}}AFX_VIRTUAL 3JwSgcb  
  // Implementation t[L2'J.5  
 protected: UMnR=~.  
  HICON m_hIcon; 3<V.6'*k  
  // Generated message map functions %D%e:se  
  //{{AFX_MSG(CCaptureDlg) ua6*zop  
  virtual BOOL OnInitDialog(); PW(_yB;  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ?S;et2f  
  afx_msg void OnPaint(); ~:'gvR;x  
  afx_msg HCURSOR OnQueryDragIcon(); s (l+{b &  
  virtual void OnCancel(); tSw~_s_V  
  afx_msg void OnAbout(); > 2!^ dT^D  
  afx_msg void OnBrowse(); 3|z;K,`Fw  
  afx_msg void OnChange(); XFLjVrX[  
 //}}AFX_MSG :Kt{t46)  
 DECLARE_MESSAGE_MAP() *J*zml3  
}; ;h*"E(P p  
#endif 0  /D5  
IJL^dXCu  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file [kU[}FT  
#include "stdafx.h" gwkZk-f\p  
#include "Capture.h" S1 R #]  
#include "CaptureDlg.h" ?w|\ 7T.?  
#include <windowsx.h> URj% J/jD  
#pragma comment(lib,"hook.lib") hfP(N_""S  
#ifdef _DEBUG VH$\ a~|  
#define new DEBUG_NEW `UzCq06rJ1  
#undef THIS_FILE M[&.kH  
static char THIS_FILE[] = __FILE__; DU*Hnii  
#endif exa}dh/uC  
#define IDM_SHELL WM_USER+1 j[Hg]  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); DVeF(Y3&  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); @Reh?]# v  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; P^o"PKA  
class CAboutDlg : public CDialog j:\_*f  
{ =qVAvo'  
 public: KJ05Zx~uma  
  CAboutDlg(); A=l?IC@O  
  // Dialog Data AH ?MJKY@Z  
  //{{AFX_DATA(CAboutDlg) `zV-1)=  
  enum { IDD = IDD_ABOUTBOX }; MXu+I,y*  
  //}}AFX_DATA PhI{3B/  
  // ClassWizard generated virtual function overrides 123-i,epg  
  //{{AFX_VIRTUAL(CAboutDlg) P dE)m/  
 protected: dzk?Zg  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support >u%[J!Y;;  
  //}}AFX_VIRTUAL ).@)t:uNa  
  // Implementation !*$'fn'bAA  
 protected: |x}&wFV  
  //{{AFX_MSG(CAboutDlg) )gm\e?^   
  //}}AFX_MSG ek_i{'hFd  
  DECLARE_MESSAGE_MAP() d,E/9y\e  
}; kB!M[[t  
aNh1e^j  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) <jg wdbT"6  
{ jAK`96+D~b  
 //{{AFX_DATA_INIT(CAboutDlg) \)s 3]/"7  
 //}}AFX_DATA_INIT Luu-c<*M  
} 'TEwU0<%  
vzgudxG'z  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) pQ6t]DJ4  
{ U7Sl@-#|  
 CDialog::DoDataExchange(pDX); %.r5E2'  
 //{{AFX_DATA_MAP(CAboutDlg) DrYoC7   
 //}}AFX_DATA_MAP 9Y*VzQE  
} kA->xjk  
=V4_DJ(&  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) vzT6G/  
 //{{AFX_MSG_MAP(CAboutDlg) c_j )8  
 // No message handlers WLA_YMlA  
 //}}AFX_MSG_MAP RdpQJ)3F  
END_MESSAGE_MAP() 62KW HB9S  
>G -?e!  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/)  MYW 4@#  
: CDialog(CCaptureDlg::IDD, pParent) OYCFx2{  
{ ,4?|}xg  
 //{{AFX_DATA_INIT(CCaptureDlg) hJL0M!  
  m_bControl = FALSE; EJiF_  
  m_bAlt = FALSE; U#^:f7-$.  
  m_bShift = FALSE; I n%yMH8  
  m_Path = _T("c:\\"); 1Y"y!\t7G  
  m_Number = _T("0 picture captured."); GCmVmOdKr  
  nCount=0; 7H@Cy}a  
  bRegistered=FALSE; '3kL=(  
  bTray=FALSE; aABE= 9Y  
 //}}AFX_DATA_INIT we@En .>f  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 (Su2 \x  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); x[,wJzp\6  
} H'(o}cn7~  
8`R}L  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) bKbpI>;[  
{ d%|#m)  
 CDialog::DoDataExchange(pDX); !D]6Cq  
 //{{AFX_DATA_MAP(CCaptureDlg) 4~J1pcBno%  
  DDX_Control(pDX, IDC_KEY, m_Key); 4pHPf<6  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); JT+lWhy  
  DDX_Check(pDX, IDC_ALT, m_bAlt); $1`t+0^k  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); lKD<  
  DDX_Text(pDX, IDC_PATH, m_Path); b|C,b"$N0  
  DDX_Text(pDX, IDC_NUMBER, m_Number); XdXS^QA .s  
 //}}AFX_DATA_MAP ^i,0n}>  
} F[qI fh4  
YuZ   
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) C{Xk/Er5<  
//{{AFX_MSG_MAP(CCaptureDlg) *d*;M>  
 ON_WM_SYSCOMMAND() |"(3]f\  
 ON_WM_PAINT() zAdVJ58H  
 ON_WM_QUERYDRAGICON() ? Gu_UW  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) _ O71r}4  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 2ZFK jj  
 ON_BN_CLICKED(ID_CHANGE, OnChange) T<~[vjA  
//}}AFX_MSG_MAP iZqFVr&JF  
END_MESSAGE_MAP() o+WrIAR  
.Af)y_  
BOOL CCaptureDlg::OnInitDialog() ${H&Q*  
{ (~yJce  
 CDialog::OnInitDialog(); Bd]DhPhJ  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); C=f(NpyD6  
 ASSERT(IDM_ABOUTBOX < 0xF000); NNrZb?  
 CMenu* pSysMenu = GetSystemMenu(FALSE); x@(f^P  
 if (pSysMenu != NULL) pt;Sk?-1  
 { Gb)iB  
  CString strAboutMenu; ;eSf4_~  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 761"S@tf$}  
  if (!strAboutMenu.IsEmpty()) )ejqE6'[  
  { r}M4()9L  
   pSysMenu->AppendMenu(MF_SEPARATOR); 9'r3L)[  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ;DWp>jgy  
  } z Clm'X/  
 } ?;QKe0I^  
 SetIcon(m_hIcon, TRUE); // Set big icon =1B&d[3;  
 SetIcon(m_hIcon, FALSE); // Set small icon E MbI\=>yS  
 m_Key.SetCurSel(0); ~2qG" 1[\  
 RegisterHotkey(); /hy!8c7  
 CMenu* pMenu=GetSystemMenu(FALSE); dD2e"OIX  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); dK`O,[}  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ?26[%%  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 3cQmxp2*  
 return TRUE; // return TRUE unless you set the focus to a control EJ|ZZYke!  
} !ZcA Ltq  
Cjb p-  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) m9i%U   
{ cB'4{R@e  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) F476"WF  
 { ^mb*w)-p?  
  CAboutDlg dlgAbout; w3hL.Z,kV  
  dlgAbout.DoModal(); G+yz8@  
 } ~a|Q[tiV]  
 else K&oO+G^f  
 { K%@SS8!oy  
  CDialog::OnSysCommand(nID, lParam); f3&//h8  
 } +f~3FXM  
} T$B4DQ  
~x\ Q\Cxp  
void CCaptureDlg::OnPaint() @WE$%dr  
{ mM%BO(X{=  
 if (IsIconic()) mT$tAwzTC{  
 { "N"k8,LH  
  CPaintDC dc(this); // device context for painting _Dt TG<E  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); [vT,zM  
  // Center icon in client rectangle N8Q{4c  
  int cxIcon = GetSystemMetrics(SM_CXICON); akoKx)(<  
  int cyIcon = GetSystemMetrics(SM_CYICON); ZdzGJ[$  
  CRect rect; 4v JIO{m  
  GetClientRect(&rect); +Uk.|@b=-V  
  int x = (rect.Width() - cxIcon + 1) / 2; U7'oI;C$e  
  int y = (rect.Height() - cyIcon + 1) / 2; wB GxJ\+M  
  // Draw the icon u _^=]K;  
  dc.DrawIcon(x, y, m_hIcon); a"N_zGf2$  
 } Vp94mi#L }  
 else 1T`"/*!  
 { q/ zdd3a  
  CDialog::OnPaint(); 1Tkdr 2  
 } {.)D)8`<d  
} jC7XdYp  
2}#PDh n  
HCURSOR CCaptureDlg::OnQueryDragIcon() X28WQdP,7  
{ 5qko`r@#  
 return (HCURSOR) m_hIcon; 0pz X!f1~  
} /! 3:K<6@  
L4-Pq\2  
void CCaptureDlg::OnCancel() \Ki#"%S  
{ [K QZHIe  
 if(bTray) T!E LH!  
  DeleteIcon(); (]dZ+"O{  
  CDialog::OnCancel(); 0:S)2"I58p  
} j+_75t`AZ  
Un+Jz ?Y  
void CCaptureDlg::OnAbout() (\ %y)  
{ JC3)G/m(03  
 CAboutDlg dlg; (q7mzZY  
 dlg.DoModal(); 1(a\$Di  
} 8h 2?Q  
[b'fz  
void CCaptureDlg::OnBrowse() KfS^sT  
{ } 4^UVdz  
 CString str; >{8H==P  
 BROWSEINFO bi; 3 g&mND  
 char name[MAX_PATH]; rKq]zHgpo  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); mK4A/bsE  
 bi.hwndOwner=GetSafeHwnd(); - d6>  
 bi.pszDisplayName=name; OkXOV   
 bi.lpszTitle="Select folder"; \aozecpC`  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; bp_@e0  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); C I0^eaFs  
 if(idl==NULL) ay.IKBXc  
  return; $r_gFv  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); g#*N@83C  
 str.ReleaseBuffer(); aKO@_R,:  
 m_Path=str; VVOt%d  
 if(str.GetAt(str.GetLength()-1)!='\\') W=:+f)D  
  m_Path+="\\"; } U.B$4Q  
 UpdateData(FALSE); -t?G8,,  
} c^%k1pae(  
>kT~X ,o  
void CCaptureDlg::SaveBmp() 9IV WbJ  
{ yFqC-t-i  
 CDC dc; gw^+[}U#  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ~E~J*R Ze  
 CBitmap bm; ^DOcw@Z6HC  
 int Width=GetSystemMetrics(SM_CXSCREEN); $Tza<nA  
 int Height=GetSystemMetrics(SM_CYSCREEN); sjGZ ,?%  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 7\ lb+^$  
 CDC tdc; cCs:z   
 tdc.CreateCompatibleDC(&dc); WBIS  
 CBitmap*pOld=tdc.SelectObject(&bm); 4vphLAm  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 4{pa`o3  
 tdc.SelectObject(pOld); wr(?L7 $+  
 BITMAP btm; |Rc#Q<Vh|  
 bm.GetBitmap(&btm); Tc :`TE=2  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; AJ mzg  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 'cv/"26#  
 BITMAPINFOHEADER bih; bcG-js-  
 bih.biBitCount=btm.bmBitsPixel; P8f-&(  
 bih.biClrImportant=0; mLO6`]p{H  
 bih.biClrUsed=0; 98"NUT  
 bih.biCompression=0; QkbN2mFv%  
 bih.biHeight=btm.bmHeight; !/SFEL@_B  
 bih.biPlanes=1; ;iVyJZI  
 bih.biSize=sizeof(BITMAPINFOHEADER); Sz&`=x#  
 bih.biSizeImage=size; G 2##M8:U0  
 bih.biWidth=btm.bmWidth; ;d4_l:9p  
 bih.biXPelsPerMeter=0; ;f\0GsA#  
 bih.biYPelsPerMeter=0; Nx__zC^r  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 5ZLH=8L  
 static int filecount=0; (ydeZx  
 CString name; 4m:E:zVn  
 name.Format("pict%04d.bmp",filecount++); YuZnuI@m9  
 name=m_Path+name; ]M/w];:  
 BITMAPFILEHEADER bfh; :%gBcL9T  
 bfh.bfReserved1=bfh.bfReserved2=0; _=b[b]Ec$s  
 bfh.bfType=((WORD)('M'<< 8)|'B'); w# ['{GL  
 bfh.bfSize=54+size; Y9N:%[ :>W  
 bfh.bfOffBits=54; (;N_lF0  
 CFile bf; ~JJv 2  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ *zcH3a,9"x  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); `/O_6PQ}  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); tx.sUu6  
  bf.WriteHuge(lpData,size); apXq$wWq{D  
  bf.Close(); 'Tn$lh  
  nCount++; ]So%/rOvX  
 } Qa=;Elp:[  
 GlobalFreePtr(lpData); })Jp5vv  
 if(nCount==1) _]g6 3q  
  m_Number.Format("%d picture captured.",nCount); ?`xId;}J#7  
 else Ty m!7H2  
  m_Number.Format("%d pictures captured.",nCount); : SNp"|  
  UpdateData(FALSE); w[iQndu  
} WG,{:|!E  
IaB A2  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) #X+)  
{ 6m9Z5:xG  
 if(pMsg -> message == WM_KEYDOWN) B!Y;VdX  
 { SFHa(JOS  
  if(pMsg -> wParam == VK_ESCAPE) [M.Vu  
   return TRUE; > 01k u  
  if(pMsg -> wParam == VK_RETURN) I/adzLQ  
   return TRUE; J GdVSjNC  
 } d 9|u~3  
 return CDialog::PreTranslateMessage(pMsg); PF~&!~S>W  
} hikun 2  
<m!\Ma  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) @m6E*2Gg  
{ +.=a R<Q  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ UX6-{ RP  
  SaveBmp(); 28-@Ga4  
  return FALSE; *k/_p ^  
} jm!G@k6TA  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ W;1Hyk  
 CMenu pop; CzgLgh;:T  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 0R.@\?bhL  
 CMenu*pMenu=pop.GetSubMenu(0); +ad 2  
 pMenu->SetDefaultItem(ID_EXITICON); 2 IGAZ%%  
 CPoint pt; MkQSq MU=  
 GetCursorPos(&pt); Kxg09\5i  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); rei<{woX  
 if(id==ID_EXITICON) ,,?t>|3  
  DeleteIcon(); a}yJ$6xi  
 else if(id==ID_EXIT) {x+jFj.  
  OnCancel(); _+GCd8d  
 return FALSE; d(tq;2-  
} /<@oUv  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); bAgKOfT  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) q o'1Pknz  
 AddIcon(); GYBM]mW^ W  
 return res; {YkW5zC(L  
} wi!Ml4Sb  
pl%ag~i5  
void CCaptureDlg::AddIcon() ^'}Td~(  
{ MSA*XDnN  
 NOTIFYICONDATA data; M/BBNT  
 data.cbSize=sizeof(NOTIFYICONDATA); O!a5  
 CString tip; bz@4obRqf  
 tip.LoadString(IDS_ICONTIP); ? O.&=im_  
 data.hIcon=GetIcon(0); -" DI,o  
 data.hWnd=GetSafeHwnd(); #JVcl $0Y  
 strcpy(data.szTip,tip); j0Q ;OKu  
 data.uCallbackMessage=IDM_SHELL; yd2ouCUV  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 8g<3J-7Mm  
 data.uID=98; Es?~Dd  
 Shell_NotifyIcon(NIM_ADD,&data); ruoiG?:T  
 ShowWindow(SW_HIDE); 2D "mq~ V  
 bTray=TRUE; %;gD_H4mm  
} [Ga 9^e$Zv  
_9<Ko.GVq  
void CCaptureDlg::DeleteIcon() 3]wV`mD  
{ c1c0b|B!U  
 NOTIFYICONDATA data; x.'O_7c0:  
 data.cbSize=sizeof(NOTIFYICONDATA); oYu5]ry  
 data.hWnd=GetSafeHwnd(); 3o6N&bQ b  
 data.uID=98; Qq5)|m  
 Shell_NotifyIcon(NIM_DELETE,&data); ]R0^ }sI  
 ShowWindow(SW_SHOW); f F?=W  
 SetForegroundWindow(); 7[Y<5T]  
 ShowWindow(SW_SHOWNORMAL); K2&pTA~OR  
 bTray=FALSE; ^NP" m  
} ^Xh9:OBF  
hd\iW7  
void CCaptureDlg::OnChange() \i{=%[c  
{ N j?,'?'O}  
 RegisterHotkey(); <#:"vnm$j  
} Y1+f(Q  
WO]dWO6Mm  
BOOL CCaptureDlg::RegisterHotkey() m~# O ~)  
{ zp d4uto5  
 UpdateData(); A\WgtM  
 UCHAR mask=0; %6 Bt%H  
 UCHAR key=0; fuQ? @F  
 if(m_bControl) Ehg5u'cj  
  mask|=4; .x}ImI  
 if(m_bAlt) V]IS(U(  
  mask|=2; N1_nBQF )  
 if(m_bShift) 1h|JKu0  
  mask|=1; QGfU:  
  key=Key_Table[m_Key.GetCurSel()]; 'H+pwp"M@  
 if(bRegistered){ 8He^j5  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); "Y4 tt0I  
  bRegistered=FALSE; *2@Ne[dYEF  
 } g!4"3Dtdg  
 cMask=mask; \ B<(9  
 cKey=key; UA}k"uM  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); d!!5'/tmS  
 return bRegistered;  u"tv6Qp  
} A2]N :=  
"#(]{MY  
  四、小结 IS"UBJ6p  
Yk[yG;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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