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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: IxaF *4JG  
  mI'&!@WG  
  一、实现方法 +E-CsNAZ*"  
3?e~J"WXC5  
  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: PUmgcMt  
7~Z(dTdSG  
#pragma data_seg("shareddata") ==AmL]*  
HHOOK hHook =NULL; //钩子句柄 L%jIU<?Z7  
UINT nHookCount =0; //挂接的程序数目 3JEg3|M(  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 qe 'RvBz  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 XK&G`cJ[  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey q_cP<2`@V  
static int KeyCount =0; .$fSWlM;  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 6aLRnH"Ud  
#pragma data_seg() +ZOKfX  
RsYMw3)G  
  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。 6MNrH  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: f,x;t-o+R  
0 9qfnQG  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ,0c]/Sd*p  
cKey,UCHAR cMask) n?U^vK_  
{ \)?+6D'#  
 BOOL bAdded=FALSE; +NbiUCMX  
 for(int index=0;index<MAX_KEY;index++){ udXzsY9Ng  
  if(hCallWnd[index]==0){ v: veKA  
   hCallWnd[index]=hWnd; 6_:I~TTX  
   HotKey[index]=cKey; C^;>HAK|F  
   HotKeyMask[index]=cMask; O>'tag  
   bAdded=TRUE; 4/%Y@Z5  
   KeyCount++; sY4q$Fq  
   break; mfG m>U  
  } Si@ 6'sw  
 } 5KP\#Y  
 return bAdded; KY}H-  
} M4D @G  
//删除热键 YUHiD *  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 9)t[YE:U3!  
{ Z~<=I }@  
 BOOL bRemoved=FALSE; 8Ihl}aguW  
 for(int index=0;index<MAX_KEY;index++){ ?T.=y m  
  if(hCallWnd[index]==hWnd){ ,i1BoG  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Oi zj |'  
    hCallWnd[index]=NULL; 0ckmHv  
    HotKey[index]=0; ]-9w'K d  
    HotKeyMask[index]=0; .rITzwgB  
    bRemoved=TRUE; _9JFlBx  
    KeyCount--; 5\= y9Z- x  
    break; R7U%v"F>`  
   } $wi4cHh  
  } o.kDOqd  
 } d^J)Mhju  
 return bRemoved; vS)>g4  
} R :(-"GW'  
ma+AFCi  
".%d{z}vz  
  DLL中的钩子函数如下: UfPHV%Wd  
!><asaB]1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) fIl!{pv[  
{ /s~S\dG  
 BOOL bProcessed=FALSE; [61*/=gWe  
 if(HC_ACTION==nCode) HFI0\*xn(  
 { TYb$+uY  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ZZ!">AN`^  
   switch(wParam) M;,$ )>P  
   {  I8j:{*h  
    case VK_MENU: :)D7_[i  
     MaskBits&=~ALTBIT; /.<v,CR  
     break; ]/H6%"CTa  
    case VK_CONTROL: B ~N3k  
     MaskBits&=~CTRLBIT; *<!q@r<d  
     break; ^a_a%ws  
    case VK_SHIFT: : S3+UT  
     MaskBits&=~SHIFTBIT; *=2W:,$  
     break; WA"~6U*  
    default: //judge the key and send message jT =|!,Pn  
     break; [)1vKaC  
   } n\l?+)S *  
   for(int index=0;index<MAX_KEY;index++){ d_M+W@{  
    if(hCallWnd[index]==NULL) } P ,"  
     continue; QJRnpN/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;_)~h$1%=  
    { Leb|YX  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 1QG q;6\  
     bProcessed=TRUE; p>;@]!YWQ  
    } 8zD>t~N2C  
   } wCB*v<*  
  } lQHF=Jex  
  else if((lParam&0xc000ffff)==1){ //有键按下 1.F&gP)9  
   switch(wParam) R-S<7Q3E0=  
   { Ze eV-  
    case VK_MENU: tLTavE[@  
     MaskBits|=ALTBIT; O*~z@"\  
     break; z{ :;Rb  
    case VK_CONTROL: 31a,i2Q4  
     MaskBits|=CTRLBIT; fUkqhqe  
     break; <.QaOLD  
    case VK_SHIFT: ],pB:=  
     MaskBits|=SHIFTBIT; &sWr)>vs  
     break; gmRc4o  
    default: //judge the key and send message \D?'.Wo%  
     break; ORs :S$Nt$  
   } 1+; bd'Ie  
   for(int index=0;index<MAX_KEY;index++){ q`'f /CS  
    if(hCallWnd[index]==NULL) T,pr&1]Lw  
     continue; ~R w1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) W^tD6H;  
    { K=[7<b,:3  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); CUI3^;&S  
     bProcessed=TRUE; bE !SW2:M  
    } 4d@yAr}  
   } K6IT$$g  
  } l/'GbuECm  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 gu(:'5cX  
   for(int index=0;index<MAX_KEY;index++){ *OG<+#*\_?  
    if(hCallWnd[index]==NULL) /grTOf&  
     continue; .*-8rOcc  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 4>jHS\jc  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);  pux IJ  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 SsZC g#i  
   } .5 . (S^u  
  } (u@:PiU/eP  
 } _`udd)Y2  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); +; KUL6  
} xaMDec V  
I@cw=_EQL  
  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: 0Qt!w(  
HoGYgye=  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); = j1Jl^[  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); H -Mb:4  
kK[4uQQ  
  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: S0^a)#D &  
v76Gwu$ d  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) |UXSUP @s  
{ ( eTrqI`  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) GTP'js  
 { DhyR  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 h3?>jE=H  
  SaveBmp(); [H}> 2Q  
  return FALSE; _i05' _  
 } FCE y1^u  
 …… //其它处理及默认处理 "2cOSPpQL  
} 0caZ_-zU  
Ln h =y2  
kB 8^v7o  
  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。 6.D|\;9{c  
ZxF`i>/h  
  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。 Tv=lr6t8  
r2=@1=?8  
  二、编程步骤 l_h:S`z.  
hq=;ZI  
  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"; FzInIif  
<V&0GAZ  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; b>uD-CSA  
}DhqzKl  
  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; gNCS*a  
E8PDIjp  
  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; {MgRi 7  
$mQ0w~:@  
  5、 添加代码,编译运行程序。 sA2-3V<t8  
I"Zp^j  
三、程序代码 7gC?<;\0  
42dv3bE"  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL FNQ<k[#K'~  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) (/]'e}  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ b>-DX  
#if _MSC_VER > 1000 meX2Y;  
#pragma once x92^0cMf  
#endif // _MSC_VER > 1000 Kip&YB%rk  
#ifndef __AFXWIN_H__ T\l`Y-vu  
#error include 'stdafx.h' before including this file for PCH 5u!\c(TJ+  
#endif Sm'Tz&!  
#include "resource.h" // main symbols @]Cg5QW>T  
class CHookApp : public CWinApp _C !i(z!d  
{ [IYVrT&C'  
 public: 2k.VTGak  
  CHookApp(); }N g P`m  
  // Overrides CF bNv9GZj  
  // ClassWizard generated virtual function overrides N~)-\T:ap  
  //{{AFX_VIRTUAL(CHookApp) JS/'0.  
 public: y'2|E+*V  
  virtual BOOL InitInstance(); <[dcIw<7  
  virtual int ExitInstance(); D3o,2E(o  
  //}}AFX_VIRTUAL @| z _&E  
  //{{AFX_MSG(CHookApp) )?rq8VO  
  // NOTE - the ClassWizard will add and remove member functions here. &n<YmW?"  
  // DO NOT EDIT what you see in these blocks of generated code ! pD{OB  
  //}}AFX_MSG 7]VR)VAM  
  DECLARE_MESSAGE_MAP() F-m%d@P&X  
}; [q9B" @X  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); B;9,Qbb  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); hr vTFJ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); tMl y*E  
BOOL InitHotkey(); KIF9[/P  
BOOL UnInit(); :60v bO  
#endif u&zY>'}zm  
 [Sm<X  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ('&lAn  
#include "stdafx.h" >_}isCd,  
#include "hook.h" /v!yI$xc  
#include <windowsx.h> Hx#YN*\.M  
#ifdef _DEBUG JQQyl:=  
#define new DEBUG_NEW DGvuo 8  
#undef THIS_FILE u({^8: AYu  
static char THIS_FILE[] = __FILE__; tJ(xeb  
#endif un "I  
#define MAX_KEY 100 (5$Ge$  
#define CTRLBIT 0x04 Myc-lCE  
#define ALTBIT 0x02 m212 gc0u  
#define SHIFTBIT 0x01 >G`p T#  
#pragma data_seg("shareddata") yy3rh(ea  
HHOOK hHook =NULL; UQ0!tFx  
UINT nHookCount =0; o#m31* o  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey FvsVfV U  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ZKi&f,:  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 6P{bUom?  
static int KeyCount =0; i c{I  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift {~apY,3  
#pragma data_seg() A{_CU-,  
HINSTANCE hins; NO5k1/-  
void VerifyWindow(); 9^*RK6  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 8\{!*?9!  
//{{AFX_MSG_MAP(CHookApp) 24wDnDyh  
// NOTE - the ClassWizard will add and remove mapping macros here. t 24`*'  
// DO NOT EDIT what you see in these blocks of generated code! R}oN8  
//}}AFX_MSG_MAP 'n|U   
END_MESSAGE_MAP() Pt"K+]Ym  
YnpN -Y%g  
CHookApp::CHookApp() Yn?beu'  
{ tw4,gW  
 // TODO: add construction code here, VxY]0&sq  
 // Place all significant initialization in InitInstance 9R=avfI  
} 19fa7E<  
[Qs`@u<%  
CHookApp theApp; k8 #8)d  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Z=% j|xE_  
{ -mJs0E*g  
 BOOL bProcessed=FALSE; 0H_Ai=G  
 if(HC_ACTION==nCode) i9 aR#  
 { OP!R>|  
  if((lParam&0xc0000000)==0xc0000000){// Key up J`g5Qn @S  
   switch(wParam) WsbVO|C  
   { QGNKQ`~  
    case VK_MENU: . vHHw@  
     MaskBits&=~ALTBIT; rQv5uoD  
     break; (^yaAy#4  
    case VK_CONTROL: :>!-[hfQ  
     MaskBits&=~CTRLBIT; APl]EV" l  
     break; QN8+Uj/zx  
    case VK_SHIFT: % Z6Q/+#fn  
     MaskBits&=~SHIFTBIT; bqn(5)%{  
     break; :^(y~q?  
    default: //judge the key and send message bZ`#;D<  
     break; @,<jPR.  
   } /3)\^Pof  
   for(int index=0;index<MAX_KEY;index++){ FH}?QebSR  
    if(hCallWnd[index]==NULL) .]>Tj^1  
     continue; 7#JnQ| ]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) #JYl%=#,  
    { :s_o'8z7L  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); w,P@@Q E  
     bProcessed=TRUE; i?^L",[  
    } 2wpJ)t*PF  
   } 1tbA-+  
  } q&=z^Ln!G  
  else if((lParam&0xc000ffff)==1){ //Key down pCkMm)2g!  
   switch(wParam) 4$^mLD$>  
   { U_VP\ 03  
    case VK_MENU: F,vkk{Z>  
     MaskBits|=ALTBIT; @*rMMy 4  
     break; 0^*,E/}P&  
    case VK_CONTROL: ;[o:VuTs  
     MaskBits|=CTRLBIT; K2*rqg  
     break; IWYQ67Yj   
    case VK_SHIFT: k*_Gg  
     MaskBits|=SHIFTBIT; ]D nAW'm  
     break; O#.YTTj  
    default: //judge the key and send message tHzgZo Bz  
     break; pbKmFweq  
   } v,n 8$,  
   for(int index=0;index<MAX_KEY;index++) :G6CWE  
   { Fepsa;\sU  
    if(hCallWnd[index]==NULL) W9l ](Ow  
     continue; ;tQc{8O6L  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <IWg]AJT :  
    { C6c*y\O\7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); r?)1)?JnHe  
     bProcessed=TRUE; 6!i`\>I]  
    } #;99vwc  
   } gy?uk~p  
  } F7' MoH  
  if(!bProcessed){ $j,$O>V  
   for(int index=0;index<MAX_KEY;index++){ = V')}f~C  
    if(hCallWnd[index]==NULL) '-myOM7  
     continue; 6}Y==GP t  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) [!U%''  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); H%vgPQ8  
   } 1E$\&*(  
  } Gt{%O>P8t  
 } {_tq6ja-<  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 0J?443A Y  
} @V>]95RX  
|./:A5_h  
BOOL InitHotkey() PM!JjMeQh  
{ (J4( Ge  
 if(hHook!=NULL){ Dlz0*eHD  
  nHookCount++; nYyKz Rz  
  return TRUE; H6Zo|n  
 } S.[L?uE~F  
 else B _ J2Bf  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); e 6wevK\  
  if(hHook!=NULL) @ddCVxd  
   nHookCount++; 0++RxYFCL  
  return (hHook!=NULL); &@xm< A\S  
} ) YB'W_  
BOOL UnInit() Q|[^dju  
{ q-^{2.ftcx  
 if(nHookCount>1){ !]?kvf-3e  
  nHookCount--; WUau KRR.  
  return TRUE; %>/&&(BE  
 } xj D$i'V+  
 BOOL unhooked = UnhookWindowsHookEx(hHook); K:e[#b8 :R  
 if(unhooked==TRUE){ S*n5d>;  
  nHookCount=0; 5(2 C  
  hHook=NULL; p%iZ6H>G  
 } tVf):}<h  
 return unhooked; Vk`Uz1*  
} 'uzHI@i  
9e.v[K~  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 43g1/,klm  
{ 9b6U] z,  
 BOOL bAdded=FALSE; mph9/ %]S  
 for(int index=0;index<MAX_KEY;index++){ s/t,6-~EH  
  if(hCallWnd[index]==0){ zk1]?  
   hCallWnd[index]=hWnd; Z Uj1vf6I  
   HotKey[index]=cKey; \0Xq&CG=E  
   HotKeyMask[index]=cMask; g?iZ RM  
   bAdded=TRUE; Gv]94$'J9  
   KeyCount++; <k3KCt  
   break; >;"%Db  
  } !r6Yq,3  
 } ;9#%E  
 return bAdded; B*)mHSs2  
} Vug[q=i  
'I}wN5`  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;d fIzi  
{ 8LF=l1=~  
 BOOL bRemoved=FALSE; ,Y| ;V  
 for(int index=0;index<MAX_KEY;index++){ d" 0&=/  
  if(hCallWnd[index]==hWnd){ Ya~Th)'>q  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Y_C6*T%  
    hCallWnd[index]=NULL; ^N^s|c'  
    HotKey[index]=0; (I6Q"&h]  
    HotKeyMask[index]=0; %p7onwKq0  
    bRemoved=TRUE; Ik, N/[  
    KeyCount--; ?ecR9X k  
    break; ve"tbNL  
   } 00SS<iX  
  } 7k%!D"6_R  
 } *6][[)(  
 return bRemoved; ~Hd *Xl  
} Jw;G_dQ[  
} gwfe H  
void VerifyWindow() cb|hIn\>7  
{ t@ri`?0w  
 for(int i=0;i<MAX_KEY;i++){ BbCW3!(  
  if(hCallWnd!=NULL){ 3&"uf9d  
   if(!IsWindow(hCallWnd)){ J0f!+]~G3  
    hCallWnd=NULL; o:*$G~. k  
    HotKey=0; ;jQ^8 S  
    HotKeyMask=0; u^i3@JuX  
    KeyCount--; t+pA9^$[ `  
   } _V8;dv8  
  } ^R :zma  
 } SY:ISzB}  
} q-@&n6PEOZ  
`SZ-o{  
BOOL CHookApp::InitInstance() {wk#n.c  
{ ?I+$KjE+  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 9D,!]  
 hins=AfxGetInstanceHandle(); 8N |K   
 InitHotkey(); xh#pw2v7V  
 return CWinApp::InitInstance(); x|c_(  
} l+wfP76w  
Y]`o-dV  
int CHookApp::ExitInstance() Yi[MoYe/K  
{ TI2K_'  
 VerifyWindow(); k}qCkm27  
 UnInit(); :AQ9-&i/a-  
 return CWinApp::ExitInstance(); PRB lf  
} C1l'<  
bVa?yWb.  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file WjSu4   
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 9&6P,ts%Q  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Q W c^}#!!  
#if _MSC_VER > 1000 @Jqo'\~&  
#pragma once 1U^KN~!  
#endif // _MSC_VER > 1000 gLFTnMO  
k!bJ&} Q(b  
class CCaptureDlg : public CDialog #W.vX=/*  
{ 8^_e>q*W  
 // Construction /?b{*<TK  
 public: Jp^#G2  
  BOOL bTray; 'n\PS,[1R  
  BOOL bRegistered; BG.sHI{  
  BOOL RegisterHotkey(); =}I=s@  
  UCHAR cKey; LCzeE7x  
  UCHAR cMask; 9d( M%F  
  void DeleteIcon(); ]Wjcr2Wq  
  void AddIcon(); u i$4  
  UINT nCount; L.JL4;U P  
  void SaveBmp(); 8A::q;  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor L`w r~E2u  
  // Dialog Data zuFPG{^\#  
  //{{AFX_DATA(CCaptureDlg) =8rNOi  
  enum { IDD = IDD_CAPTURE_DIALOG }; PY3bn).uR  
  CComboBox m_Key; ^ZRZ0:rZ  
  BOOL m_bControl; Y%|dM/a`  
  BOOL m_bAlt; |b^UPrz)VS  
  BOOL m_bShift; &h!O<'*2  
  CString m_Path; |YV> #l  
  CString m_Number; Zw'050~-  
  //}}AFX_DATA >p;&AaXkoG  
  // ClassWizard generated virtual function overrides Z#^|h0  
  //{{AFX_VIRTUAL(CCaptureDlg) ]ZW-`UMO  
 public: c^puz2  
  virtual BOOL PreTranslateMessage(MSG* pMsg); -XK;B--c  
 protected: Ho[]03  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support cq3Z}Cp  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); (ov&iNx  
  //}}AFX_VIRTUAL V\]j^$  
  // Implementation ?2\oi*$  
 protected: @0C[o9  
  HICON m_hIcon; \1n (Jr.<  
  // Generated message map functions bu $u@:q 6  
  //{{AFX_MSG(CCaptureDlg)  ylS6D  
  virtual BOOL OnInitDialog(); DO+~    
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Dfc% jWbA  
  afx_msg void OnPaint(); _IV!9 JL  
  afx_msg HCURSOR OnQueryDragIcon(); f4F%\ "  
  virtual void OnCancel(); vifw FPe  
  afx_msg void OnAbout(); _6`GHx   
  afx_msg void OnBrowse(); C@zG(?X  
  afx_msg void OnChange(); ._<, Eodv  
 //}}AFX_MSG #`K{vj  
 DECLARE_MESSAGE_MAP() D&G?Klq  
}; >ke.ZZV?  
#endif ~Eb:AC5  
yJ ljCu)f  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file /0fHkj/J=B  
#include "stdafx.h" q@ ;1{  
#include "Capture.h" jENC1T(  
#include "CaptureDlg.h" d<HO~+9  
#include <windowsx.h> u?g&(h  
#pragma comment(lib,"hook.lib") #a2Z.a<V  
#ifdef _DEBUG Gr)G-zE  
#define new DEBUG_NEW 1;i|GXY:h  
#undef THIS_FILE ^;9l3P{  
static char THIS_FILE[] = __FILE__; zxH<~2  
#endif }[drR(]`dO  
#define IDM_SHELL WM_USER+1 ;3xi.^=B  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `-R&4%t%  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .X"&k O>G  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ;*9<lUvu  
class CAboutDlg : public CDialog +Wy`X5v  
{ %hw4IcWJ|  
 public: J=(i0A  
  CAboutDlg(); 0=t2|,}  
  // Dialog Data *A8Et5HAv  
  //{{AFX_DATA(CAboutDlg) XP:fL NpQ  
  enum { IDD = IDD_ABOUTBOX }; ZU `~@.`i  
  //}}AFX_DATA q #7Nk)<.  
  // ClassWizard generated virtual function overrides /0Qo(  
  //{{AFX_VIRTUAL(CAboutDlg) Kng=v~)N'  
 protected: /FpPf[  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support |`Yn'Mj8rm  
  //}}AFX_VIRTUAL P>)J:.tr0  
  // Implementation IMM sOl  
 protected: 1OMaY5F  
  //{{AFX_MSG(CAboutDlg) 2G!z/OAj  
  //}}AFX_MSG 0aI@m  
  DECLARE_MESSAGE_MAP() !7Qj8YmS  
}; d)D!np=  
E_[a|N"D  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) |O'*CCrCL  
{ Qt_KUtD  
 //{{AFX_DATA_INIT(CAboutDlg) /YU8L  
 //}}AFX_DATA_INIT *P]]7DR  
} ZqpK}I  
2J$vX(  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) c&wiTvRV  
{ |M t2  
 CDialog::DoDataExchange(pDX); u*uHdV5  
 //{{AFX_DATA_MAP(CAboutDlg) HkhZB^_V  
 //}}AFX_DATA_MAP |22vNt_  
} ZG#:3d*)  
< .e4  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ahCwA}  
 //{{AFX_MSG_MAP(CAboutDlg) YRf$?xa  
 // No message handlers 3PL0bejaT7  
 //}}AFX_MSG_MAP ;#IrHR*Bk  
END_MESSAGE_MAP() M6qNh`+HO  
QlR~rFs9t  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) *icaKy3  
: CDialog(CCaptureDlg::IDD, pParent) ~&F|g2:  
{ 4 x4[  
 //{{AFX_DATA_INIT(CCaptureDlg) omy3<6  
  m_bControl = FALSE; jOGiT|A  
  m_bAlt = FALSE; hJSWh5]  
  m_bShift = FALSE; ot! m=s  
  m_Path = _T("c:\\"); qTwl\dcncC  
  m_Number = _T("0 picture captured."); F`(;@LO  
  nCount=0; $?gKIv>g  
  bRegistered=FALSE; )dEcKH<#  
  bTray=FALSE; #*"V'dj;e  
 //}}AFX_DATA_INIT v3t<rv  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 B1E:P`t  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); (V'w5&f(L  
} 1{d;Ngx  
1tiOf~)  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) PU1YR;[Fe  
{ 9xw"NcL  
 CDialog::DoDataExchange(pDX); >t'A1`W  
 //{{AFX_DATA_MAP(CCaptureDlg) p W5D!z  
  DDX_Control(pDX, IDC_KEY, m_Key); /?XI,#j3kM  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); uW/>c$*)  
  DDX_Check(pDX, IDC_ALT, m_bAlt); gp$Rf9\  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ?2,D-3 {  
  DDX_Text(pDX, IDC_PATH, m_Path); c>3? T^=  
  DDX_Text(pDX, IDC_NUMBER, m_Number); {r|RH"|?Z(  
 //}}AFX_DATA_MAP ZfVY:U:o>  
} &OXx\}>MW  
Xppb|$qp4H  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) r%X M`;bQX  
//{{AFX_MSG_MAP(CCaptureDlg) v JVh%l+  
 ON_WM_SYSCOMMAND() #=ij</  
 ON_WM_PAINT() a$^)~2U{  
 ON_WM_QUERYDRAGICON() |F<iu2\  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Df*<3G  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) u#^l9/tl  
 ON_BN_CLICKED(ID_CHANGE, OnChange) CAom4 Sp'  
//}}AFX_MSG_MAP %VR{<{3f  
END_MESSAGE_MAP() whP5 u/857  
vRf$#fBEQ  
BOOL CCaptureDlg::OnInitDialog() n$7*L9)(C  
{ N1.1  
 CDialog::OnInitDialog(); *f>\X[wN  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 8tna<Hx  
 ASSERT(IDM_ABOUTBOX < 0xF000); zOFHdd ,"g  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Yh@2m9  
 if (pSysMenu != NULL) {^uiu^RAc  
 { Q{'4,J-w  
  CString strAboutMenu; K[/L!.Ag  
  strAboutMenu.LoadString(IDS_ABOUTBOX); #9.%>1{6Y  
  if (!strAboutMenu.IsEmpty()) Pi9?l>  
  { wqV"fZA\]  
   pSysMenu->AppendMenu(MF_SEPARATOR); x^pt^KR;  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); `{ HWk^  
  } [UC_  
 } JZ5";*,  
 SetIcon(m_hIcon, TRUE); // Set big icon PE/uB,Wl  
 SetIcon(m_hIcon, FALSE); // Set small icon d8+@K&z|  
 m_Key.SetCurSel(0); S&XlMu  
 RegisterHotkey(); `#8kJt  
 CMenu* pMenu=GetSystemMenu(FALSE); 6vps`k$,~  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); UQ7]hX9  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); p9u'nDi  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 2cIKph  
 return TRUE; // return TRUE unless you set the focus to a control h*!oHS~/l  
} q+p}U}L= k  
nTwJR  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) p8@&(+z  
{ >qr/1mW  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) _`^AgRE  
 { qz3 Z'  
  CAboutDlg dlgAbout; w3sU&  |N  
  dlgAbout.DoModal(); hAc|a9 o  
 } ]$9y7Bhj.  
 else Ok{1{EmP  
 { L]!![v.VY  
  CDialog::OnSysCommand(nID, lParam); |mHf 7gCX  
 } r<:d+5"  
} <Z.{q Zd  
v@q&B|0  
void CCaptureDlg::OnPaint() i '*!c  
{ w%iw xo   
 if (IsIconic()) G/(,,T}eG  
 { vxC];nCC#  
  CPaintDC dc(this); // device context for painting /VufL+q1  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); :3 Hz!iZM  
  // Center icon in client rectangle x0ipk}  
  int cxIcon = GetSystemMetrics(SM_CXICON); =7H\llL4BC  
  int cyIcon = GetSystemMetrics(SM_CYICON); kV T |(Y  
  CRect rect; 7qUg~GJX  
  GetClientRect(&rect); tD}-&"REP  
  int x = (rect.Width() - cxIcon + 1) / 2; "JLE  
  int y = (rect.Height() - cyIcon + 1) / 2; |?Edk7`  
  // Draw the icon _,aFQ^]'9  
  dc.DrawIcon(x, y, m_hIcon); AH/o-$C&  
 } 4u%AZ<-C}m  
 else !m9hL>5vR  
 { -qaO$M^Q  
  CDialog::OnPaint(); ,]:< l  
 } 32SkxcfrCK  
} $MwBt  
z\ONw Ml  
HCURSOR CCaptureDlg::OnQueryDragIcon() \7*|u  
{ 'Rsr*gX#  
 return (HCURSOR) m_hIcon; rCczQ71W  
} _b-g^#L%  
MD<x{7O12>  
void CCaptureDlg::OnCancel() 3%GsTq2o  
{ A- Abj'  
 if(bTray) 6Y,&q|K  
  DeleteIcon(); glU9A39qx?  
  CDialog::OnCancel(); G!I5Er0pdy  
} <a -a~  
G/},lUzLg  
void CCaptureDlg::OnAbout() ]S@T|08b  
{ Vjt7X"_/  
 CAboutDlg dlg; ip}%Y6Wj  
 dlg.DoModal(); 9e>2kd  
} Yu_ eCq5/  
JBJ?|}5k4c  
void CCaptureDlg::OnBrowse() GBRiU &D  
{ =1R 2`H\  
 CString str; 2 YWO'PL  
 BROWSEINFO bi; : fYfXm  
 char name[MAX_PATH]; 1D8S}=5&  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); qk3 ~]</  
 bi.hwndOwner=GetSafeHwnd(); er1X Z  
 bi.pszDisplayName=name; SC2LY  
 bi.lpszTitle="Select folder"; 2 V\hG?<  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 2~g-k 3  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); W1 xPK*  
 if(idl==NULL) P{`fav  
  return; fSVM[  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); PZZPx<?N  
 str.ReleaseBuffer(); V?x&\<;,  
 m_Path=str; Z"w}`&TC$^  
 if(str.GetAt(str.GetLength()-1)!='\\') h;r^9g  
  m_Path+="\\"; mSu$1m8  
 UpdateData(FALSE); [qkW/qS  
} cyHbAtl  
:PY8)39@K  
void CCaptureDlg::SaveBmp() b3%a4Gg&  
{ r^rk@W;[  
 CDC dc; ( )ldn?v  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 1'TS!/ll];  
 CBitmap bm; V62lN<M  
 int Width=GetSystemMetrics(SM_CXSCREEN); z~p!7q&g  
 int Height=GetSystemMetrics(SM_CYSCREEN); r]D>p&4  
 bm.CreateCompatibleBitmap(&dc,Width,Height); s/11 TgJ  
 CDC tdc; ~.U \Y  
 tdc.CreateCompatibleDC(&dc); qyKR]%yzi  
 CBitmap*pOld=tdc.SelectObject(&bm); ZK'WKC  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); mA,{E-T  
 tdc.SelectObject(pOld); CA&VnO{r  
 BITMAP btm; 4%_c9nat  
 bm.GetBitmap(&btm); $kmY[FWu?  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Rb:?%\=  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); y,n.(?!*  
 BITMAPINFOHEADER bih; saQ ~v@  
 bih.biBitCount=btm.bmBitsPixel; T7/DH  
 bih.biClrImportant=0; 8JR&s  
 bih.biClrUsed=0; k6z]"[yu  
 bih.biCompression=0; L5KcI  
 bih.biHeight=btm.bmHeight; '4~I %Z7L  
 bih.biPlanes=1; :-hVbS0I  
 bih.biSize=sizeof(BITMAPINFOHEADER); =<aFkBX-  
 bih.biSizeImage=size; ZDI?"dt{  
 bih.biWidth=btm.bmWidth; e F}KOOfC  
 bih.biXPelsPerMeter=0; Rx&.,gzj[  
 bih.biYPelsPerMeter=0; HP<a'|r  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); u:W/6QS  
 static int filecount=0; k_?OEkgUh  
 CString name; 4u41M,nJQd  
 name.Format("pict%04d.bmp",filecount++); N,VI55J:y>  
 name=m_Path+name; &><b/,]  
 BITMAPFILEHEADER bfh; RK$(  
 bfh.bfReserved1=bfh.bfReserved2=0; wzoT!-_X  
 bfh.bfType=((WORD)('M'<< 8)|'B'); @/$i -?E  
 bfh.bfSize=54+size; p g_H'0R  
 bfh.bfOffBits=54; r_tt~|s,>  
 CFile bf; (47la$CR  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ubVZEsoW?  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); i$6a0'@U  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); #NL'r99D/o  
  bf.WriteHuge(lpData,size); SXJjagAoML  
  bf.Close(); :1gpbfW  
  nCount++; CMv8n@ry  
 } ?`kZ6$  
 GlobalFreePtr(lpData); Vl<7>  
 if(nCount==1) JdWav!PYm  
  m_Number.Format("%d picture captured.",nCount); eHd7fhW5  
 else l4iklg3  
  m_Number.Format("%d pictures captured.",nCount); ^4<&"aoo  
  UpdateData(FALSE); $ZB`4!JxG  
} /Q:mUd  
C,LosAd  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) {9XNh[NbP  
{ %CgV:.,K  
 if(pMsg -> message == WM_KEYDOWN) 7;Q4k"h  
 { d(b~s2\i  
  if(pMsg -> wParam == VK_ESCAPE) QX=x^(M$m  
   return TRUE; :B7U),T  
  if(pMsg -> wParam == VK_RETURN) Z^_zcH'  
   return TRUE; 37jrWe6xwp  
 } %yl17:h#  
 return CDialog::PreTranslateMessage(pMsg);  |*-<G3@  
} 0B}2~}#  
I-Ut7W  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) "oF)u1_?  
{ pW>{7pXn  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ :l iDoGDi  
  SaveBmp(); WNKP';(a@G  
  return FALSE; [9MbNJt 8~  
} i*!2n1c[  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ '^$+G0jv  
 CMenu pop; fWi/mK3c  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); P46Q3EE  
 CMenu*pMenu=pop.GetSubMenu(0); ~ ^   
 pMenu->SetDefaultItem(ID_EXITICON); 2\T\p<_20  
 CPoint pt; N0NFgW;  
 GetCursorPos(&pt); b&LAk-}[  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); S QGYH  
 if(id==ID_EXITICON) a1_o  
  DeleteIcon(); U)aftH *Pk  
 else if(id==ID_EXIT) kBoQjOV`  
  OnCancel(); Y#=MN~##t  
 return FALSE; rcY &n^:  
} jcBZ#|B7;  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 3Z&!zSK^  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) be5N{lPT@;  
 AddIcon(); ?N!kYTR%}  
 return res; 6h %rt]g  
} 6CW5ay_,  
y=EVpd  
void CCaptureDlg::AddIcon() ~<s^HP2U{  
{ rzLW @k  
 NOTIFYICONDATA data; ;/JXn  
 data.cbSize=sizeof(NOTIFYICONDATA); 0 ]L   
 CString tip; W}MN-0  
 tip.LoadString(IDS_ICONTIP); oDi+\0  
 data.hIcon=GetIcon(0); uI%7jA~@  
 data.hWnd=GetSafeHwnd(); CXyb8z4/+  
 strcpy(data.szTip,tip); [+ xsX*+  
 data.uCallbackMessage=IDM_SHELL; <yBa5m@/  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; W-/V5=?   
 data.uID=98; ecQ,DOX|b  
 Shell_NotifyIcon(NIM_ADD,&data); xk7Dx}  
 ShowWindow(SW_HIDE); ;^E_BJm  
 bTray=TRUE; kLU-4W5t  
} $60`Hh 4/  
R<{Vgy  
void CCaptureDlg::DeleteIcon() cF8X  
{ |5X[/Q*K`W  
 NOTIFYICONDATA data; $AE5n>ZD$  
 data.cbSize=sizeof(NOTIFYICONDATA); j0a=v}j3  
 data.hWnd=GetSafeHwnd(); %b4tyX:N0  
 data.uID=98; J|%bRLX@>  
 Shell_NotifyIcon(NIM_DELETE,&data); iemp%~UZ  
 ShowWindow(SW_SHOW); \hBzP^*"n  
 SetForegroundWindow(); rKyulgP  
 ShowWindow(SW_SHOWNORMAL); JPng !tvR  
 bTray=FALSE; h,]VWG  
} *h3iAcM8  
7C,giCYU  
void CCaptureDlg::OnChange() NVsaV;u  
{ NRp  
 RegisterHotkey(); nhjT2Sl  
} G :k'm^k  
1;V_E2?V  
BOOL CCaptureDlg::RegisterHotkey() ugE!EEy[^  
{ b.@4yW  
 UpdateData(); .8!\6=iJB  
 UCHAR mask=0; } e+`Kxy  
 UCHAR key=0; l!&ik9m  
 if(m_bControl) ]W`?0VwF  
  mask|=4; Y|Gp\  
 if(m_bAlt) xz.Jmv  
  mask|=2; t H.L_< N  
 if(m_bShift) vB{i w}Hi!  
  mask|=1; Y_!+Y<x7v  
  key=Key_Table[m_Key.GetCurSel()]; ?6`B;_m  
 if(bRegistered){ fi`\e W  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); vO~  Tx  
  bRegistered=FALSE; +qC [X~\  
 } GJr mK  
 cMask=mask; *q k7e[IP  
 cKey=key; "NGfT:HV  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); %<(d %&~  
 return bRegistered; }l[e@6r F  
} f pq|mY  
h@G~' \8t  
  四、小结 tkr&Fs"t+  
aK@ Y) Ju'  
  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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