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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: yWb4Ify  
  q-_' W,  
  一、实现方法 Z a(|(M H  
3CZS)  
  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: 6gU{(H   
"#4dW7E  
#pragma data_seg("shareddata") sn{tra  
HHOOK hHook =NULL; //钩子句柄 Mu&x_&|  
UINT nHookCount =0; //挂接的程序数目 fk{0d  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ZA820A>2!  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 |5MbAqjzC  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey `^6 ,kI-c  
static int KeyCount =0; @dEiVF`4:  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 75NRCXh.  
#pragma data_seg() 1@qgF  
[Qj;/  
  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。 <]d LX}C)  
E=w3=\JP  
  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: E^CiOTN  
z]@6fM[  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR c$h9/H=~  
cKey,UCHAR cMask) s\3q!A?S3  
{ cUk*C  
 BOOL bAdded=FALSE; DL8x":;  
 for(int index=0;index<MAX_KEY;index++){ |FNCXlgZ  
  if(hCallWnd[index]==0){ bw S*]!*  
   hCallWnd[index]=hWnd; z&}-8JykH  
   HotKey[index]=cKey; ;rHO&(h-  
   HotKeyMask[index]=cMask; DBgMC"_   
   bAdded=TRUE; ^jSsa  
   KeyCount++; g0R[xOS|  
   break; `u_Qa  
  } i.y)mcB4  
 } l=={pb  
 return bAdded; >)**khuP7  
} EL D!{bMT  
//删除热键 w0J|u'H  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) \".^K5Pm  
{ Zv!{{XO2;  
 BOOL bRemoved=FALSE; ,r^"#C0J}  
 for(int index=0;index<MAX_KEY;index++){ K=\O5#F?3  
  if(hCallWnd[index]==hWnd){  jNyoN1M  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ #&8rcu;/  
    hCallWnd[index]=NULL; [V}, tO|  
    HotKey[index]=0; Ng=ONh  
    HotKeyMask[index]=0; 4. qtp`  
    bRemoved=TRUE; i$^ZTb^  
    KeyCount--; k%81f'H  
    break; V5mTu)tp5  
   } (6gK4__}]  
  } ,kM)7!]N  
 } /X*oS&-M  
 return bRemoved; #x@eDnb_  
} =Lp7{09u  
27Emm c  
ccJM>9  
  DLL中的钩子函数如下: lB;FUck9  
&^.57]  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) n"D ?I  
{ #"*e+.j[;  
 BOOL bProcessed=FALSE; #JW+~FU`  
 if(HC_ACTION==nCode) 9pSUIl9|j  
 { 3iX?~  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 |U' I/A  
   switch(wParam) *_-'/i  
   {  b[ w;i]2  
    case VK_MENU: !CY&{LEYn0  
     MaskBits&=~ALTBIT; q_fam,9  
     break; }JgYCsF/f  
    case VK_CONTROL: +[-i%b3q  
     MaskBits&=~CTRLBIT; 5Fw - d  
     break; C NrII sJ  
    case VK_SHIFT: []pN$]+c  
     MaskBits&=~SHIFTBIT; Yl^mAS[w&  
     break; _}6q{}jn:c  
    default: //judge the key and send message dJk9@u  
     break; ,!QV>=  
   } [ .,>wo~  
   for(int index=0;index<MAX_KEY;index++){ LlYTv% I  
    if(hCallWnd[index]==NULL) W;_E4  
     continue; kUl  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) g=8un`]7  
    { !q"cpL'4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); uaPx"  
     bProcessed=TRUE; ^TdZ*($5  
    } ~N0 sJ%  
   } n# 7Pr/*0  
  } |NFZ(6vNh  
  else if((lParam&0xc000ffff)==1){ //有键按下 *%FA:Y  
   switch(wParam) y/_XgPfWU  
   { S ZU \i*  
    case VK_MENU: A*yi"{FLi  
     MaskBits|=ALTBIT; ;{Ux_JEg  
     break; QG gF|c7  
    case VK_CONTROL: A;X=bj _&a  
     MaskBits|=CTRLBIT; 8At<Wic  
     break; ['qnn|  
    case VK_SHIFT:  :$r ^_  
     MaskBits|=SHIFTBIT; L"+$Wc[|  
     break; 2f:^S/.A  
    default: //judge the key and send message ] ZoPQUS?  
     break;  $)~   
   } R{hf9R,  
   for(int index=0;index<MAX_KEY;index++){ I/J7rkf  
    if(hCallWnd[index]==NULL) Sus;(3EX  
     continue; bZwnaM4"F  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) qL /7^) (  
    { z?]G3$i(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); VR? ^HA9  
     bProcessed=TRUE; 19e8  
    } #s5N[uK^m  
   } 6sfwlT  
  } oYM3Rgxf9Q  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 umEVy*hc  
   for(int index=0;index<MAX_KEY;index++){ va)%et0!  
    if(hCallWnd[index]==NULL) n~IVNB*  
     continue;  >]D4Q<TY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))  a*dQ _  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); a:STQk V  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 |AZW9  
   } io2)1cE&f  
  } R!\EK H  
 } .p` pG3  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); :Ixx<9c.  
} 9"{W,'r&d  
HfNDD| Zz  
  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: `TLzVB-j3  
{tP%epQ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); B2=\2<  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); / +K?  
WN]<q`.  
  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: ' I}: !Z  
J4$! 68  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) tfO#vw,@  
{ YPDf Y<?v  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) i^`9syD  
 { V >-b`e  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ~l[r a  
  SaveBmp(); =3xE:  
  return FALSE; QP@<)`1t9  
 } iP@6hG`:  
 …… //其它处理及默认处理 iPG0o %  
} hf6f.Z  
)$%Z:  
6 ,ANNj  
  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。 _u0$,Y?&|  
g2cVZ!GIj  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 &?,U_)x/  
A;XOT6jv?  
  二、编程步骤 El_Qk[X|A  
-NGK@Yk22  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; N3BL3:@O  
8,T4lb<<  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; y^>Q/H\  
fT\:V5-  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; )=pD%$iq  
;F:fM!l=  
  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; zt24qTKL  
k3!a$0Bs;  
  5、 添加代码,编译运行程序。 . RVVWqW  
n 1b(\PA  
三、程序代码 dhPKHrS  
XUMX*  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 8TV;Rtl  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ed 59B)?l  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Q[n\R@  
#if _MSC_VER > 1000 DPgm%Xq9(!  
#pragma once 6c4&VW  
#endif // _MSC_VER > 1000 x+5k <Xi}  
#ifndef __AFXWIN_H__ SUCU P<G  
#error include 'stdafx.h' before including this file for PCH 9Ru;`  
#endif /lhz],w  
#include "resource.h" // main symbols }Rvm &?~O  
class CHookApp : public CWinApp sfT+i;p  
{ RF}X ER  
 public: j-@kW'K  
  CHookApp(); < E|s\u  
  // Overrides <Q < AwP  
  // ClassWizard generated virtual function overrides vYmSKS  
  //{{AFX_VIRTUAL(CHookApp) gApoX0nrv  
 public: 0Wvq>R.(]7  
  virtual BOOL InitInstance(); B0}~G(t(  
  virtual int ExitInstance(); q(o/yx{bm  
  //}}AFX_VIRTUAL 5FKBv e@  
  //{{AFX_MSG(CHookApp) l*aj#%ha  
  // NOTE - the ClassWizard will add and remove member functions here. yGBQ0o7E  
  // DO NOT EDIT what you see in these blocks of generated code ! x+5p1sv6  
  //}}AFX_MSG od<b!4k~s  
  DECLARE_MESSAGE_MAP()  cc=gCE  
}; l U]un&[N  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); [onqNp  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); BbOu/i|  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); \kIMDg3}  
BOOL InitHotkey(); @`"AHt  
BOOL UnInit(); ]DG?R68DQ  
#endif >Q E{O.Z  
^ZeJ[t&!#  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. VaZn{z  
#include "stdafx.h" n`Z"rwKmNw  
#include "hook.h" f|EUqu%E  
#include <windowsx.h> 7v}x?I  
#ifdef _DEBUG ;^u*hZN[Up  
#define new DEBUG_NEW q z&+=d@  
#undef THIS_FILE ITJ q  
static char THIS_FILE[] = __FILE__; V3N0Og3  
#endif cR{>IH4^  
#define MAX_KEY 100 7k%T<;V  
#define CTRLBIT 0x04 5A Bhj*7  
#define ALTBIT 0x02 [dX`K`k  
#define SHIFTBIT 0x01 z2c5m  
#pragma data_seg("shareddata") M(q'%XL^  
HHOOK hHook =NULL; e&q?}Ho  
UINT nHookCount =0;  l]!9$  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey faXx4A2"  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Tpp&  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ?^#lWx q  
static int KeyCount =0; /?-7Fg+,  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 6R UrF  
#pragma data_seg() u`:hMFTID  
HINSTANCE hins; Gi6T["  
void VerifyWindow(); (P|~>k  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 5r {;CKKz  
//{{AFX_MSG_MAP(CHookApp) "VxWj}+]  
// NOTE - the ClassWizard will add and remove mapping macros here. ,{eU P0]  
// DO NOT EDIT what you see in these blocks of generated code! h&@R| N  
//}}AFX_MSG_MAP 4 {GU6v)f  
END_MESSAGE_MAP() 4\5uY  
C_fY %O  
CHookApp::CHookApp() V,v[y\  
{ hIv@i\`  
 // TODO: add construction code here, ( n{wg(R  
 // Place all significant initialization in InitInstance pI[ZBoR~  
} ,3DXFV'uxb  
Fig&&b a  
CHookApp theApp; `D5HC  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ;,'igdold  
{ oS,I~}\kQ  
 BOOL bProcessed=FALSE; &xZyM@  
 if(HC_ACTION==nCode) AN:@fZ  
 { OK|qv[  
  if((lParam&0xc0000000)==0xc0000000){// Key up " K*  
   switch(wParam) xFv;1Q  
   { JOn yrks  
    case VK_MENU: 4JIYbb-a'  
     MaskBits&=~ALTBIT; th5g\h%j*  
     break; ^}yg%+  
    case VK_CONTROL: g|<Sfp+;+  
     MaskBits&=~CTRLBIT; ra '  
     break; o`,Qku k  
    case VK_SHIFT: %i0?UpA  
     MaskBits&=~SHIFTBIT; Ok-.}q>\Mv  
     break; ;(6g\'m  
    default: //judge the key and send message >cmE t  
     break; 9?T{}| ?  
   } G28O%jD?  
   for(int index=0;index<MAX_KEY;index++){ 5 x2Ay=s  
    if(hCallWnd[index]==NULL) w2(guL($  
     continue; 6$Q,Y}j  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =TvzS%U  
    { ITuq/qts]A  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); cF T 9Lnz  
     bProcessed=TRUE; donw(_=  
    } nx":"LFI  
   } v0*N)eqDGd  
  } E9! N>0  
  else if((lParam&0xc000ffff)==1){ //Key down s=I'e/"7  
   switch(wParam) Z^KA  
   { bBxw#_3A?E  
    case VK_MENU: G`=r^$.3WB  
     MaskBits|=ALTBIT; eDO!^.<5  
     break; eEc4bVQa  
    case VK_CONTROL: hmbj*8  
     MaskBits|=CTRLBIT; AF\T\mtvRm  
     break; C"T1MTB  
    case VK_SHIFT: 7XrfuG*L$  
     MaskBits|=SHIFTBIT; cvsz%:Vs  
     break; lVH<lp_ZtK  
    default: //judge the key and send message f,i5iSYf  
     break; %rKK[  
   } o@>? *=  
   for(int index=0;index<MAX_KEY;index++) ER&UBUu"  
   { }]P4-KqI  
    if(hCallWnd[index]==NULL) q!'rz  
     continue; Z@D*1\TG=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) bJr[I  
    { ug 7o>PX  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ]ekk }0  
     bProcessed=TRUE; e59dVFug.U  
    } P3tx|:gV  
   } G1T^a>tj4  
  } TTNk r`  
  if(!bProcessed){ !v#xb3"/  
   for(int index=0;index<MAX_KEY;index++){ {0\,0*^p  
    if(hCallWnd[index]==NULL) Y o0FUj  
     continue; .~lKBkS`!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) n_K~ vD  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ~!6K]hB4  
   } JeH;v0  
  } C2e.2)y  
 } F-Z%6O,2  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ?^Hf Np9  
} OIb  
)8gGv  
BOOL InitHotkey() Aez2*g3  
{ 8Ad606  
 if(hHook!=NULL){ 4NEq$t$Jn  
  nHookCount++; <T?oKOD ]  
  return TRUE; JM$.O;y -  
 } &`|:L(+  
 else iSK+GQ~  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); D.!~dyI.,$  
  if(hHook!=NULL) ytEC   
   nHookCount++; H( -Y  
  return (hHook!=NULL); >/f_F6ay#  
} PrF}a<:n:  
BOOL UnInit() D?jk$^p~m#  
{ lB8il2&  
 if(nHookCount>1){ p(SRjQt  
  nHookCount--; wVs.Vcwr  
  return TRUE; >r5P3G1  
 } !%mAh81{&/  
 BOOL unhooked = UnhookWindowsHookEx(hHook); +y+"Fyl  
 if(unhooked==TRUE){ xk~IN%\  
  nHookCount=0; z1OFcqm  
  hHook=NULL; EfLO5$?rm  
 } td2/9|Q  
 return unhooked; w-B^ [<  
} R  
Q }k.JS~#  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 8Chj w wB  
{ |C \}P  
 BOOL bAdded=FALSE; 4 fV3Ear=j  
 for(int index=0;index<MAX_KEY;index++){ $ 0|a;  
  if(hCallWnd[index]==0){ U09.Y  
   hCallWnd[index]=hWnd; q=HHNjj8  
   HotKey[index]=cKey; 0x2!<z  
   HotKeyMask[index]=cMask; A?5E2T1L%.  
   bAdded=TRUE; 4S0>-?{  
   KeyCount++; F7m?xy  
   break; "tit\a6\(  
  } 8cx=#Me  
 } 89}Y5#W  
 return bAdded; gE/Tj$  
} Fh7'[>onw  
?VU(Pq*`  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) oj,lz?  
{ FX <b:#  
 BOOL bRemoved=FALSE; }!#gu3  
 for(int index=0;index<MAX_KEY;index++){ IHfzZHy  
  if(hCallWnd[index]==hWnd){ `L;eba  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ @\_x'!R  
    hCallWnd[index]=NULL; ` >!n  
    HotKey[index]=0; {npcPp9  
    HotKeyMask[index]=0; _#e&t"@GS  
    bRemoved=TRUE; iL{M+Ic  
    KeyCount--; o;"OSp  
    break; *="8?Z  
   } jdeV|H} u  
  } -u!qrJ*Z  
 } stl 1Q O(h  
 return bRemoved; c47")2/yO  
} TZir>5  
%wV>0gQTf  
void VerifyWindow() }H4=HDO  
{ 5y2? f  
 for(int i=0;i<MAX_KEY;i++){ aFiCZHohw  
  if(hCallWnd!=NULL){ r9 y.i(j  
   if(!IsWindow(hCallWnd)){ eg"Gjp- 4=  
    hCallWnd=NULL; _zxLwU1(x  
    HotKey=0; ulHn#)  
    HotKeyMask=0; 8 S`9dSc  
    KeyCount--; 3Rg}+[b  
   } fyz nuUl  
  } egR9AEJvz  
 } @(``:)Z<b  
} 3XiO@jzre  
=! Vf  
BOOL CHookApp::InitInstance() g o5]<4`r  
{ F-(dRSDNM  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); T`/IO.2  
 hins=AfxGetInstanceHandle();  c9''  
 InitHotkey(); kpwt]]e*  
 return CWinApp::InitInstance(); @Fv=u  
} ){s*n=KIO  
vqslirC  
int CHookApp::ExitInstance() <O?y-$~  
{ ;cQW sTfT  
 VerifyWindow(); _,Fny_u=;  
 UnInit(); _fFU#k:MU  
 return CWinApp::ExitInstance(); 7x]4`#u  
} Sydh2d  
,7Y-k'7Kop  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file a~h:qpg c  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) F1;lQA*7K.  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ T[k4lM  
#if _MSC_VER > 1000 C;AA/4Ib  
#pragma once y #f QPR  
#endif // _MSC_VER > 1000 :_<_[Y]1  
ukgAI<O%  
class CCaptureDlg : public CDialog zHWSE7!  
{ ?B@;QjhjiJ  
 // Construction zxb/  
 public: i[C~5}%  
  BOOL bTray; 'PZ|:9FX!  
  BOOL bRegistered;  9DQ)cy  
  BOOL RegisterHotkey(); {",MCu_V  
  UCHAR cKey; 2 gq$C"  
  UCHAR cMask;  GJi~y  
  void DeleteIcon(); 05Fz@31~  
  void AddIcon(); 148V2H)  
  UINT nCount; ?[TfpAtQ`  
  void SaveBmp(); QZAB=rR  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 9A,Z|q/z5  
  // Dialog Data dBsX*}C  
  //{{AFX_DATA(CCaptureDlg) h[KvhbD3   
  enum { IDD = IDD_CAPTURE_DIALOG }; 7T``-:`[  
  CComboBox m_Key; cxeghy:;U  
  BOOL m_bControl; 3:/'t{ ^B  
  BOOL m_bAlt; xVB;s.'!  
  BOOL m_bShift; {3a&1'a0g  
  CString m_Path; Agh`]XQ2  
  CString m_Number; 4nfu6Dq  
  //}}AFX_DATA )O+}T5c=  
  // ClassWizard generated virtual function overrides lv0nEj8F  
  //{{AFX_VIRTUAL(CCaptureDlg) Mk<Vydds  
 public: lLq<xf  
  virtual BOOL PreTranslateMessage(MSG* pMsg); .%BT,$1K  
 protected: Mk 0+D#  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8eIUsI.o  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); +'@+x'/{^  
  //}}AFX_VIRTUAL h!@|RW&}qX  
  // Implementation #qU-j/Qf  
 protected: gbOpj3  
  HICON m_hIcon; !{et8F@d|  
  // Generated message map functions j*@l"V>~  
  //{{AFX_MSG(CCaptureDlg) [sV"ws  
  virtual BOOL OnInitDialog(); 2Q7R6*<N:  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); <F7kh[L_x  
  afx_msg void OnPaint(); <`X"}I3 ba  
  afx_msg HCURSOR OnQueryDragIcon(); v!3A9!.  
  virtual void OnCancel(); b2(RpY2Y  
  afx_msg void OnAbout(); a ?} .Fs  
  afx_msg void OnBrowse(); zIC;7 5#  
  afx_msg void OnChange(); E9\vA*a  
 //}}AFX_MSG ' #NcZy  
 DECLARE_MESSAGE_MAP() k- V,~c  
}; YG:3Fhx0~  
#endif M$4k;  
e"]8T},  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file W/z7"#  
#include "stdafx.h" x_=n-lAF  
#include "Capture.h" [u@Jc,  
#include "CaptureDlg.h" Z 2}ah  
#include <windowsx.h> Ft=zzoVKg  
#pragma comment(lib,"hook.lib") Q'l^9Bz  
#ifdef _DEBUG zepop19  
#define new DEBUG_NEW "]'?a$\ky:  
#undef THIS_FILE yw[#  
static char THIS_FILE[] = __FILE__; +cJy._pi!  
#endif :a8 YV!X  
#define IDM_SHELL WM_USER+1 OV2 -8ERS  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); t- u VZ!`\  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); (2ur5uk+  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; H~eRT1  
class CAboutDlg : public CDialog vr#+0:|  
{ -&82$mj  
 public: T J^u"j-'  
  CAboutDlg(); dF0,Y?  
  // Dialog Data I&?Qq k  
  //{{AFX_DATA(CAboutDlg) Xdi:1wW@p  
  enum { IDD = IDD_ABOUTBOX }; AWjJ{#W>9  
  //}}AFX_DATA f:*vr['d  
  // ClassWizard generated virtual function overrides G)#$]diNuX  
  //{{AFX_VIRTUAL(CAboutDlg) 1"8yLvtn  
 protected: :(dHY  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support a8u 9aEB  
  //}}AFX_VIRTUAL J]W5[)L  
  // Implementation AL/?,%F  
 protected: .iCDXc{#  
  //{{AFX_MSG(CAboutDlg) GWsE;  
  //}}AFX_MSG rqv))Zo`  
  DECLARE_MESSAGE_MAP() {l_{T4xToB  
}; @uo ~nFj,  
Yw5'6NU  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) -yxOBq  
{ ~pa!w?/bQ  
 //{{AFX_DATA_INIT(CAboutDlg) IJTtqo  
 //}}AFX_DATA_INIT A,su;Q h  
} i'd2[A.7I  
KKA~#iCk  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) |r ue=QZ  
{ Vc^HVyAx@n  
 CDialog::DoDataExchange(pDX); _0+0#! J!  
 //{{AFX_DATA_MAP(CAboutDlg) 6s,uXn  
 //}}AFX_DATA_MAP ^@P1 JNe  
} x@mL $  
f)]%.>  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) AV 8n(  
 //{{AFX_MSG_MAP(CAboutDlg) "G >3QL+O|  
 // No message handlers >+. ( r]  
 //}}AFX_MSG_MAP wB'zuPAK6  
END_MESSAGE_MAP() 6nhMP$h  
U$oduY#  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) \ w3]5gJZ  
: CDialog(CCaptureDlg::IDD, pParent) Z\[N!Zt|  
{ C]^H&  
 //{{AFX_DATA_INIT(CCaptureDlg) 80A.<=(=.  
  m_bControl = FALSE; [dtbkQt,c  
  m_bAlt = FALSE; =to=8H-  
  m_bShift = FALSE;  u66XN^  
  m_Path = _T("c:\\"); Z*G(5SqUh"  
  m_Number = _T("0 picture captured."); W\1i,ew>  
  nCount=0; f%5zBYCgC  
  bRegistered=FALSE; [c_|ob]  
  bTray=FALSE; E{6~oZ#L  
 //}}AFX_DATA_INIT (}.@b|s  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Y*_)h\f  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); V"cKJ;s  
} f7Ul(D:j\  
q&C""!h^  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) !4]9!<.k  
{ O1')nYF7  
 CDialog::DoDataExchange(pDX); tx?dIy;  
 //{{AFX_DATA_MAP(CCaptureDlg) CctJFcEZ  
  DDX_Control(pDX, IDC_KEY, m_Key); kw2T>  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); &A#~)i5gF  
  DDX_Check(pDX, IDC_ALT, m_bAlt); rD>*j~_+P  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); T843":  
  DDX_Text(pDX, IDC_PATH, m_Path); F~ Lx|)0M  
  DDX_Text(pDX, IDC_NUMBER, m_Number); (EPsTox  
 //}}AFX_DATA_MAP fs/*V~@  
} j }b\Z9)!  
QMv@:Eo  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) lRh9j l  
//{{AFX_MSG_MAP(CCaptureDlg) Uye|9/w8 !  
 ON_WM_SYSCOMMAND() %s19KGpA  
 ON_WM_PAINT() z;@*r}H  
 ON_WM_QUERYDRAGICON() ZiLj=bh  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Jk,;JQ  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) (8_\^jJ  
 ON_BN_CLICKED(ID_CHANGE, OnChange) h6dPO"  
//}}AFX_MSG_MAP Y^<bl2"y8  
END_MESSAGE_MAP() +{sqcr1G  
s/089jlc  
BOOL CCaptureDlg::OnInitDialog() )O:0 ]=#))  
{ h gJ[LU|>  
 CDialog::OnInitDialog(); |>@W ]CX[  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); @{Gncy|  
 ASSERT(IDM_ABOUTBOX < 0xF000); E 7-@&=]v  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Ov<NsNX]  
 if (pSysMenu != NULL) OR[{PU=X  
 { !!Z?[rj  
  CString strAboutMenu; z3?o|A}/W  
  strAboutMenu.LoadString(IDS_ABOUTBOX); @k&qb!Qah  
  if (!strAboutMenu.IsEmpty()) GfC5z n>  
  { 6'xsG?{JY  
   pSysMenu->AppendMenu(MF_SEPARATOR); N&@}/wzZ  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); gv5*!eI  
  } U*.0XNKp{  
 }  }-~l!  
 SetIcon(m_hIcon, TRUE); // Set big icon ON+J>$[[  
 SetIcon(m_hIcon, FALSE); // Set small icon jt+iv*2N>  
 m_Key.SetCurSel(0); )>BHL3@  
 RegisterHotkey(); $.]l!cmi%Q  
 CMenu* pMenu=GetSystemMenu(FALSE); 86nN"!{l:  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); arf8xqR-U]  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); -W>'^1cR  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); (p%>j0<  
 return TRUE; // return TRUE unless you set the focus to a control A_KW(;50  
} >M&3Y XC  
](|\whI  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) QY== GfHt  
{ Y3Q9=u*5  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 4j)tfhwd8  
 { aMTu-hA  
  CAboutDlg dlgAbout; qx%}knB  
  dlgAbout.DoModal(); Hc`A3SMR  
 } X.:]=,aGW  
 else 4*$G & TX  
 { DK}"b}Fvq  
  CDialog::OnSysCommand(nID, lParam); ;J7F J3n  
 } GgKEP,O  
} 2#k5+?-c61  
$8BPlqBIZ  
void CCaptureDlg::OnPaint() XVU2T5s}  
{ 3po:xMY  
 if (IsIconic()) 0Lb4'25.  
 { f5` g  
  CPaintDC dc(this); // device context for painting 5 (A5Y-B  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); fDSv?crv  
  // Center icon in client rectangle ={u0_j W  
  int cxIcon = GetSystemMetrics(SM_CXICON); Wl}&?v&@  
  int cyIcon = GetSystemMetrics(SM_CYICON); }u1O#L}F5  
  CRect rect; 2it?$8#i  
  GetClientRect(&rect); /t(C>$ }p  
  int x = (rect.Width() - cxIcon + 1) / 2; }}<z/zN&^  
  int y = (rect.Height() - cyIcon + 1) / 2; l} qE 46EL  
  // Draw the icon "Iix )Ue  
  dc.DrawIcon(x, y, m_hIcon); jRatm.N  
 } M8u<qj&<O  
 else ?R$&Xe!5  
 { 0x!2ihf  
  CDialog::OnPaint(); )RcL/n  
 } KZeQ47|  
} $cZUM}@  
jq!tT%o*B  
HCURSOR CCaptureDlg::OnQueryDragIcon() :Lz\yARpk  
{ "]G\9b)   
 return (HCURSOR) m_hIcon; Sf r&p>{,  
} 1m.W<  
Ot`VR&}  
void CCaptureDlg::OnCancel() T' ~!9Q  
{ !Ta>U^ 7  
 if(bTray) b Ax?&$  
  DeleteIcon(); C$5[X7'  
  CDialog::OnCancel(); %!1Q P[}K  
} _l1NKk  
`ta7Gc/:UY  
void CCaptureDlg::OnAbout() *Aa?yg:=  
{ !3ctB3eJ  
 CAboutDlg dlg; Exk\8,EGqS  
 dlg.DoModal(); M4W5f#C5Ee  
} y  TDNNK  
Kde9 $  
void CCaptureDlg::OnBrowse() +k>.Q0n%m  
{ ZGd!IghL  
 CString str; p*P)KP  
 BROWSEINFO bi; 3=L.uXVb  
 char name[MAX_PATH]; o-Ga3i 8  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); yR\btx|e5~  
 bi.hwndOwner=GetSafeHwnd(); zi3\63D3eO  
 bi.pszDisplayName=name; Kx%Sku<F'  
 bi.lpszTitle="Select folder"; 2j&AiD  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; cSm%s  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); B9J&=6`)  
 if(idl==NULL) ;"m ,:5%  
  return; Xp}Yw"7  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); )=etG  
 str.ReleaseBuffer(); 6w@ Ii;  
 m_Path=str; Y(d$  
 if(str.GetAt(str.GetLength()-1)!='\\') $ O5UyKI  
  m_Path+="\\"; &kpwo )  
 UpdateData(FALSE); STaA]i}P  
} J:\|Nc?  
[r[ =W!  
void CCaptureDlg::SaveBmp() -bU oCF0  
{ 9*(aU z9j  
 CDC dc; |*0<M(YXN  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Ho *AAg  
 CBitmap bm; f-7 1~  
 int Width=GetSystemMetrics(SM_CXSCREEN); x UD-iSY  
 int Height=GetSystemMetrics(SM_CYSCREEN); qZA).12qS  
 bm.CreateCompatibleBitmap(&dc,Width,Height); `FC(  
 CDC tdc; Kc^;vT>3  
 tdc.CreateCompatibleDC(&dc); LoGVwRmoC  
 CBitmap*pOld=tdc.SelectObject(&bm); Y(cGk#0  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); W}]%X4<#rN  
 tdc.SelectObject(pOld); NSDv ;|f  
 BITMAP btm; =7o"u3hG  
 bm.GetBitmap(&btm); ?%y?rk <  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ) v,:N.@Q  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Ck|8qUz-  
 BITMAPINFOHEADER bih; !U~WK$BP  
 bih.biBitCount=btm.bmBitsPixel; $ <#KA3o\  
 bih.biClrImportant=0; 8M`#pN^  
 bih.biClrUsed=0; HF.^ysI  
 bih.biCompression=0; 82DmG@"s2  
 bih.biHeight=btm.bmHeight; KkE9KwZ]W  
 bih.biPlanes=1; fw RZ5`v<  
 bih.biSize=sizeof(BITMAPINFOHEADER); RSfzRnhmr  
 bih.biSizeImage=size; ^!by3Elqqk  
 bih.biWidth=btm.bmWidth; qm8&*UuKJ  
 bih.biXPelsPerMeter=0; +@/"%9w  
 bih.biYPelsPerMeter=0; |UxG$M(  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); `WH"%V:"Q  
 static int filecount=0; .8G@%p{,  
 CString name; ,5*eX  
 name.Format("pict%04d.bmp",filecount++); $+I;oHWI  
 name=m_Path+name; ^~A>8CQOU  
 BITMAPFILEHEADER bfh; n;T7=1_"  
 bfh.bfReserved1=bfh.bfReserved2=0; UZpIcj cL  
 bfh.bfType=((WORD)('M'<< 8)|'B'); <N9[?g)  
 bfh.bfSize=54+size; 5x>}O3Q_  
 bfh.bfOffBits=54; gE?| _x#  
 CFile bf; ?n ZY)  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ d|yAs5@  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); }-6)gWe  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); vt9)pMs  
  bf.WriteHuge(lpData,size); +qwjbA+  
  bf.Close(); L-k@-)98  
  nCount++; ?C A,  
 } 8Bjib&im  
 GlobalFreePtr(lpData); c. 2).Jt,  
 if(nCount==1) 8!Ww J Oe  
  m_Number.Format("%d picture captured.",nCount); u[ Yk  
 else 6gs01c,BA  
  m_Number.Format("%d pictures captured.",nCount);  #c66)  
  UpdateData(FALSE); |YY_^C`"-  
} ]f({`&K5  
]&pds\  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 0ok-IHE<  
{ vTx2E6  
 if(pMsg -> message == WM_KEYDOWN) k-{<=>uM  
 { sH[ROm  
  if(pMsg -> wParam == VK_ESCAPE) u!W0P6   
   return TRUE; M%kO7>h8  
  if(pMsg -> wParam == VK_RETURN) Oz%>/zw[h  
   return TRUE; X'qU*Eo  
 } jm Fz51  
 return CDialog::PreTranslateMessage(pMsg); ftF@Wq1f  
} / :n#`o=;  
F 70R1OYU  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) PU1Qsb5  
{ I\$X/t +dH  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ AGYc |;  
  SaveBmp(); 7*Ej. HK  
  return FALSE; j+,d^!  
} @-!}BUs?  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ suzZdkMA  
 CMenu pop; 65aK2MS@  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); !74S  
 CMenu*pMenu=pop.GetSubMenu(0); W|g4z7Pb  
 pMenu->SetDefaultItem(ID_EXITICON); 7M<'/s  
 CPoint pt; b KN@j'M  
 GetCursorPos(&pt); <yH4HY  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); T, )__h  
 if(id==ID_EXITICON) 428>BQA  
  DeleteIcon(); |='z{WS  
 else if(id==ID_EXIT) Qh'ATo  
  OnCancel(); "$N+"3I  
 return FALSE; Gf<'WQ[  
} ikv Wh<=>H  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); r 0iK  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) l)&X$3?tz  
 AddIcon(); ''\O v  
 return res; Dw<bn<e-  
} SX# e:_  
`u teg=  
void CCaptureDlg::AddIcon() X6@WwM~qz  
{ ~3WF,mW  
 NOTIFYICONDATA data; V^Q#:@0  
 data.cbSize=sizeof(NOTIFYICONDATA); yU-e3O7L  
 CString tip; sWc*5Rt  
 tip.LoadString(IDS_ICONTIP); \Yc'~2n  
 data.hIcon=GetIcon(0); "Pu!dJ5[]  
 data.hWnd=GetSafeHwnd(); f>UXD  
 strcpy(data.szTip,tip); E(8* pI  
 data.uCallbackMessage=IDM_SHELL; m;GbLncA  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 8)10o,#L  
 data.uID=98; rFj-kojg  
 Shell_NotifyIcon(NIM_ADD,&data); vPTM  
 ShowWindow(SW_HIDE); |w<H!lGe!$  
 bTray=TRUE; 2;DuHO1  
} D)m5  
=06gj)8  
void CCaptureDlg::DeleteIcon() UVd7 JGR  
{ U<_3^  
 NOTIFYICONDATA data; =pS5uR~  
 data.cbSize=sizeof(NOTIFYICONDATA); fj;y}t1E]  
 data.hWnd=GetSafeHwnd(); n O\"HLM  
 data.uID=98; 0dGAP  
 Shell_NotifyIcon(NIM_DELETE,&data); e'~J,(fB  
 ShowWindow(SW_SHOW); 5?3Me59  
 SetForegroundWindow(); UJ CYs`y  
 ShowWindow(SW_SHOWNORMAL); IpcNuZo9&  
 bTray=FALSE; lE&&_INHQ  
} AK*LyR?  
t>`a sL  
void CCaptureDlg::OnChange() 0+kH:dP{  
{ I uMQ9 &  
 RegisterHotkey(); Tk:h@F|B.|  
} =,_ +0M9  
LIvFx|  
BOOL CCaptureDlg::RegisterHotkey() H1QJ k_RL  
{ iV*q2<>  
 UpdateData(); 0Tx{3#  
 UCHAR mask=0; CzRc%%BA  
 UCHAR key=0; jU9$Ehg I  
 if(m_bControl) 34%RZG_o'  
  mask|=4; odjT:Vr  
 if(m_bAlt) gT0BkwIV  
  mask|=2; VFURAYS  
 if(m_bShift) FrL]^59a  
  mask|=1; FtfKe"qw  
  key=Key_Table[m_Key.GetCurSel()]; -xEXN[\S  
 if(bRegistered){ %t" CX5 n  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); UQC=g  
  bRegistered=FALSE; Vr^n1sgE}r  
 } 4{rZppm  
 cMask=mask; S||}nJ0  
 cKey=key; ;>?rP88t  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); GzI yP(U  
 return bRegistered; {MCi<7j<?  
} s/q7.y7n{  
iS WU'K  
  四、小结 R3;Tk^5A  
 CohDO  
  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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