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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: ;>r E+k%_  
  'QQa :3<x  
  一、实现方法 gRg8D{  
gX;)A|9e  
  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: *:8,w?Nt  
AGK{t+`  
#pragma data_seg("shareddata") ]oizBa@?G  
HHOOK hHook =NULL; //钩子句柄 yyc4'j+  
UINT nHookCount =0; //挂接的程序数目 d~z%kl 5:  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ,)Z1&J?  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ^|ul3_'?  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey  7;$[s6$  
static int KeyCount =0; )W |_f  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 O1Nya\^g<I  
#pragma data_seg() 3h**y %^  
`P?!2\/  
  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。 y@9ifFr  
j71RlS73  
  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: qv)%)n  
)Ag{S[yZ  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR |G(I,EPag  
cKey,UCHAR cMask) DMiB \o  
{ Nbd[xs-lw  
 BOOL bAdded=FALSE; MTAq} 8  
 for(int index=0;index<MAX_KEY;index++){ Y;#H0v>E  
  if(hCallWnd[index]==0){ (\H^ KEy  
   hCallWnd[index]=hWnd; e|eWV{Dsz  
   HotKey[index]=cKey; m(CAXq-t  
   HotKeyMask[index]=cMask; >(C5&3^  
   bAdded=TRUE; yQE9S+%M  
   KeyCount++; W4$F\y  
   break; Y{OnW98  
  } !+_X q$9_  
 } AYv7- !Yk  
 return bAdded; ^ wb9n  
} X{8g2](z.  
//删除热键 :|\)=4  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !xE@r,'oN  
{ zszx~LSvIT  
 BOOL bRemoved=FALSE; *}=z^;_oq  
 for(int index=0;index<MAX_KEY;index++){ {~EPP .  
  if(hCallWnd[index]==hWnd){ x,UP7=6  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ?JMy  
    hCallWnd[index]=NULL; Ny G?^  
    HotKey[index]=0; k;Ask#rs  
    HotKeyMask[index]=0; }ZJ*N Y  
    bRemoved=TRUE; ZiC~8p_f  
    KeyCount--; LTcZdQd$  
    break; '1rO&F  
   } 6"/4@?  
  } YcN&\(  
 } Lc_cB`  
 return bRemoved; ?wREX[Tqs  
} }NKnV3G/Z  
:(#5%6F  
tgC)vZ&a  
  DLL中的钩子函数如下: MY l9 &8  
F&a)mpFv3c  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) `&i\q=u+  
{ -ju}I  
 BOOL bProcessed=FALSE; 4P^CqD&i  
 if(HC_ACTION==nCode) 3ICMH  
 { !7Nz_d~n  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 S#nW )=   
   switch(wParam) f47dB_{5f.  
   {  /&W~:F  
    case VK_MENU: ]MnQ3bWq"j  
     MaskBits&=~ALTBIT; @k)[p+)E  
     break; f"t+r /d  
    case VK_CONTROL: \e~5Dx1  
     MaskBits&=~CTRLBIT; 5=/j  
     break; gjn1ha"h%.  
    case VK_SHIFT: _2w8S\  
     MaskBits&=~SHIFTBIT; ~8U0(n:^  
     break; iJS7g  
    default: //judge the key and send message xc,Wm/[  
     break; KO[,C[;|j  
   } AA0\C_W0p  
   for(int index=0;index<MAX_KEY;index++){ ]E^)d|_  
    if(hCallWnd[index]==NULL) vr } -u  
     continue; +P<#6<gR  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (e4 #9  
    { X=V2^zrt  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 7sU,<Z/D  
     bProcessed=TRUE; P4fnBH4OQ  
    } ]Rj?OSok  
   } D+y?KihE  
  } KpT=twcK  
  else if((lParam&0xc000ffff)==1){ //有键按下 Q096M 0m  
   switch(wParam) {xf00/  
   { -Eoq#ULvR  
    case VK_MENU: zBc |gx  
     MaskBits|=ALTBIT; =k5O*ql"  
     break; u>/Jb+  
    case VK_CONTROL: MqRJ:x  
     MaskBits|=CTRLBIT; 1vdG \$  
     break; p# |} o9  
    case VK_SHIFT: &Qq|  
     MaskBits|=SHIFTBIT; !\!j?z=O8  
     break; +v< \l=  
    default: //judge the key and send message 1p8hn!V  
     break; a}X. ewg  
   } ._q<~_~R  
   for(int index=0;index<MAX_KEY;index++){ *!ecb1U5  
    if(hCallWnd[index]==NULL) pA6A*~QE  
     continue; #3?}MC  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) q@1xYz:J  
    { E] rBq_S  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); /7x1Z*Hg  
     bProcessed=TRUE; ?C']R(fQ\  
    } I3u)y|Y=  
   } h4Xz"i{z  
  } 7"1]5\p^g  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 nd&i9l  
   for(int index=0;index<MAX_KEY;index++){ G&08Qb ,N  
    if(hCallWnd[index]==NULL) dSe d 6  
     continue; qG +PqK;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) je%D&ci$  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); N_/+B]r }T  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 J$lfI^^  
   } +!ZfJZls  
  } +.Xi7x+#O  
 } ~K"nm{.  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ]^,!;do  
} uW2  q\  
eD7qc1*G  
  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: #qW#>0U  
LqNyi   
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); F@mxd  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); }Rw6+;  
RhC|x,E  
  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: zRbY]dW  
>GLoeCRNu  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ( 4# iLs  
{ nxNHf3   
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) I?^(j;QpS  
 { |(AFU3 ~  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 SlwQ_F"4L  
  SaveBmp(); !qU1RdZ  
  return FALSE; \+=`o .2  
 } $HtGB]  
 …… //其它处理及默认处理 |* ^LsuFb  
} )@P*F) g~  
kdp^{zW}  
1 b 86@f   
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 @_7rd  
BC\W`K  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 }r@yBUW  
]^T-X/v9  
  二、编程步骤 - Ry+WS=  
k>7bPR5Mw  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; iQS,@6  
esj6=Gh  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ifu!6_b.  
b*H*(}A6"'  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; ,II3b( l  
^9 ]iUx  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; U|VL+9#hd  
j--byk6PB  
  5、 添加代码,编译运行程序。 qDYNY`  
~KYzEqy  
三、程序代码 9 M%Gnz  
}WaZ+Mdg\  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL aKWxLe  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) C*3St`2@9  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ^+v1[U@  
#if _MSC_VER > 1000 d~QM@<SV  
#pragma once %y|pVN!U  
#endif // _MSC_VER > 1000 Ff(};$/& W  
#ifndef __AFXWIN_H__ GBT|1c'i  
#error include 'stdafx.h' before including this file for PCH 2QM{e!9  
#endif ~J&-~<%P}  
#include "resource.h" // main symbols {\CWoFht>  
class CHookApp : public CWinApp C\~}ySQc.e  
{ Bv!{V)$  
 public: JJ%@m;~  
  CHookApp(); ) $b F*  
  // Overrides AU}kIm_+  
  // ClassWizard generated virtual function overrides r)>3YM5  
  //{{AFX_VIRTUAL(CHookApp) pGjwI3_K  
 public: {59 >U~  
  virtual BOOL InitInstance(); {+=hYB|&  
  virtual int ExitInstance(); t!*[nfR  
  //}}AFX_VIRTUAL A|S)cr8z  
  //{{AFX_MSG(CHookApp) Wc2&3p9 c  
  // NOTE - the ClassWizard will add and remove member functions here. z!O;s ep?/  
  // DO NOT EDIT what you see in these blocks of generated code ! 6?~9{0  
  //}}AFX_MSG hxH6Ii]\  
  DECLARE_MESSAGE_MAP() 6QCV i  
}; \t&! &R#  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); a1y<Y`SC9  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); -X!<$<\y;  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); R6od{#5H$  
BOOL InitHotkey(); [`b,SX x  
BOOL UnInit(); Q=Mv"~2>B  
#endif \}v@!PQl  
cZ|*Zpk  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. m~AAO{\:b  
#include "stdafx.h" Nh}-6|M  
#include "hook.h" T` h%=u|D  
#include <windowsx.h> [0y,K{8t  
#ifdef _DEBUG R}gdN-941  
#define new DEBUG_NEW 5=I({=/>  
#undef THIS_FILE ,"is%O.  
static char THIS_FILE[] = __FILE__; iYgVSVNg  
#endif <ef O+X!  
#define MAX_KEY 100 Os-Z_zSl6  
#define CTRLBIT 0x04 tj~r>SRb+  
#define ALTBIT 0x02 H\oxj,+N  
#define SHIFTBIT 0x01 7HH@7vpJ^  
#pragma data_seg("shareddata") mMwV5\(  
HHOOK hHook =NULL; UX63BA  
UINT nHookCount =0; mc%. 8i  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ocWl]h].  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT dxAGO(  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Es7 c2YdU  
static int KeyCount =0; aOGoJCt C  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift \ YF@r7  
#pragma data_seg() -LRx}Mb9  
HINSTANCE hins; fYy w2"  
void VerifyWindow(); ~ Ze!F"  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) }.)R#hG?  
//{{AFX_MSG_MAP(CHookApp) O U7OX]h  
// NOTE - the ClassWizard will add and remove mapping macros here. G{fPQ=  
// DO NOT EDIT what you see in these blocks of generated code! jFdgFK c)  
//}}AFX_MSG_MAP Jw}t~m3  
END_MESSAGE_MAP() KPO w  
NzyEsZ]$  
CHookApp::CHookApp()  VQH48{X  
{ tq h)yr;  
 // TODO: add construction code here, RNw#s R  
 // Place all significant initialization in InitInstance #oTVfY#  
} }EwE#sZ#  
E*5aLT5!,  
CHookApp theApp; J' P:SC1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 9ns( F:  
{ A+M4=  
 BOOL bProcessed=FALSE;  ,c`6-  
 if(HC_ACTION==nCode) ty['yV-;a  
 { YT!iI   
  if((lParam&0xc0000000)==0xc0000000){// Key up c Q-#]  
   switch(wParam) ]I,&Bme  
   { seK;TQ3/7  
    case VK_MENU: \Qah*1  
     MaskBits&=~ALTBIT; 7=fN vES2  
     break; ==?wG!v2h  
    case VK_CONTROL: ? 3fnt"  
     MaskBits&=~CTRLBIT; Z1q<) O1QX  
     break; yO7H!}y_  
    case VK_SHIFT: k8st XW-w  
     MaskBits&=~SHIFTBIT; b*h:e.q  
     break; W895@  
    default: //judge the key and send message 1VFCK&  
     break; .$cX:"_Mk  
   } ?SYmsaSr5  
   for(int index=0;index<MAX_KEY;index++){ { /!ryOA65  
    if(hCallWnd[index]==NULL) ',[AKXJ  
     continue; WP\kg\o  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Y54yojvV  
    { Z<d=v3q  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); b)Nd}6}<?  
     bProcessed=TRUE; bvB7d` wx  
    } a+v.(mCG  
   } Bj6%mI42hl  
  } aO inD  
  else if((lParam&0xc000ffff)==1){ //Key down ~P}ng{x4z  
   switch(wParam) <^> nR3E  
   { 3<)][<Ud  
    case VK_MENU: KI\bV0$p<  
     MaskBits|=ALTBIT; w$&;s<0  
     break; ;>ml@@Z  
    case VK_CONTROL: @Zhd/=2[  
     MaskBits|=CTRLBIT; vD#kH 1  
     break; eW<NDI&b  
    case VK_SHIFT: -XnIDXM  
     MaskBits|=SHIFTBIT; nvQX)Xf  
     break; |ul{d|  
    default: //judge the key and send message _Ad63.Uq))  
     break; 5>S1lyam  
   } M7Xn=jc  
   for(int index=0;index<MAX_KEY;index++) It2:2  
   { >f&L7@  
    if(hCallWnd[index]==NULL) dlZ2iDQ%  
     continue; "-:g.x*d  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @>ys,dy  
    { LrdED[Z  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 3e-E/6zH6  
     bProcessed=TRUE; .*"KCQGOgM  
    }  Uv<nJM  
   } $mAyM+ ph[  
  } hDg"?{  
  if(!bProcessed){ l%0-W  
   for(int index=0;index<MAX_KEY;index++){ o+k*ia~Fa  
    if(hCallWnd[index]==NULL) b$ 8R  
     continue; M|@@ LJ'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) S 1~EJa5H  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); rR{KnM  
   } 8qfXc ^6  
  } Ur1kb{i  
 } -#4QY70H t  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); p74Nd4U$s  
} GKUjtPu  
&>Z;>6J,  
BOOL InitHotkey() C*RPSk  
{ &N/dxKZcc  
 if(hHook!=NULL){ G|t0no\f  
  nHookCount++; z wwJyy%/  
  return TRUE; FH%: NO  
 } T~ XKV`LQ  
 else NTCFmdbs 6  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); &Wdi 5T8  
  if(hHook!=NULL) nsq7dhq  
   nHookCount++; @x[A ^  
  return (hHook!=NULL); j}J=ZLr/V"  
} >lJTS t5{  
BOOL UnInit() # eFdu  
{ Ne3YhCC>  
 if(nHookCount>1){ M,oZ_tY%  
  nHookCount--; V`c,U7[/  
  return TRUE; Y}C|4"V  
 } y G mFi  
 BOOL unhooked = UnhookWindowsHookEx(hHook); &(p5z4Df  
 if(unhooked==TRUE){ tU!Yg"4Q  
  nHookCount=0; qf@P9M  
  hHook=NULL; N<Ym&$xR  
 } {}RU'<D  
 return unhooked; f4f)9n  
} !`W0;0'Zg  
A |U0e`Iw  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) J5<1 6}*  
{ `6#s+JA[  
 BOOL bAdded=FALSE; +`$$^x  
 for(int index=0;index<MAX_KEY;index++){ Vvfd?G"  
  if(hCallWnd[index]==0){ |S<!'rY  
   hCallWnd[index]=hWnd; OOABn*  
   HotKey[index]=cKey; D=.Ob<m`Z  
   HotKeyMask[index]=cMask; )>"Ky  
   bAdded=TRUE;  #3RElI  
   KeyCount++; ug"4P.wI  
   break; X1[zkb  
  } =@hCc  
 } >r}?v3QW  
 return bAdded; 0 xvSi9  
} 0pH$Mk Q  
ZnuRy:  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) tWaGCxaE  
{ |942#rM  
 BOOL bRemoved=FALSE; }5 $le]  
 for(int index=0;index<MAX_KEY;index++){ ,K30.E  
  if(hCallWnd[index]==hWnd){ d@b2XCh<K  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ U17=/E  
    hCallWnd[index]=NULL; j+gh*\:q  
    HotKey[index]=0; k$DRX) e  
    HotKeyMask[index]=0; &t!f dti  
    bRemoved=TRUE; b+f '  
    KeyCount--; ]n:R#55A  
    break; WYcZD_  
   } m0^~VK|  
  } J{XRltI+  
 } Zz 'g&ewo  
 return bRemoved; yB{1&S5 C  
} :DuEv:;v  
 Yg2P(  
void VerifyWindow() rH\oFCzC  
{ z  fy(j  
 for(int i=0;i<MAX_KEY;i++){ '[_.mx|cd`  
  if(hCallWnd!=NULL){ NH=@[t) P,  
   if(!IsWindow(hCallWnd)){ 4V mUTMY  
    hCallWnd=NULL; V;Ln|._/t  
    HotKey=0; x~D8XN{  
    HotKeyMask=0; +<B"g{dLuX  
    KeyCount--; Bw[#,_  
   } &#.>-D{  
  } *#?9@0b@  
 } V<PH5'^$j  
} d+0= a]  
Lso%1M  
BOOL CHookApp::InitInstance() 9gIim   
{ I@#IXH?6  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 6 lEv<)cC  
 hins=AfxGetInstanceHandle(); REsw=P!b  
 InitHotkey(); QXy= |  
 return CWinApp::InitInstance(); <R_)[{ 7  
} `ah"Q;d$  
"zqa:D26  
int CHookApp::ExitInstance() cveQ6 -`K  
{ Q0ba;KPm  
 VerifyWindow(); Wk!<P" nHd  
 UnInit(); ]-;JHB5A_:  
 return CWinApp::ExitInstance(); Y^8'P /A  
} giesof  
lWP]}Uy=5~  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file {*  w _*  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) q{f (T\  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ?papk4w  
#if _MSC_VER > 1000 Cyo:Da  A  
#pragma once it-2]Nw  
#endif // _MSC_VER > 1000 z+zEH9.'  
^^a%Lz)U  
class CCaptureDlg : public CDialog tv: mjS  
{ 2j ]uB0  
 // Construction ?<Mx*l  
 public: %<U0  
  BOOL bTray; _E/  
  BOOL bRegistered; 2dbn~j0  
  BOOL RegisterHotkey(); LIyb+rH#yg  
  UCHAR cKey; -%V~ 1  
  UCHAR cMask; [N"=rY4G  
  void DeleteIcon(); t=jG$A  
  void AddIcon(); 7>AM zNj  
  UINT nCount; ]xbMMax  
  void SaveBmp(); 4jjo%N  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ( iJ /  
  // Dialog Data m5, &;~  
  //{{AFX_DATA(CCaptureDlg) +NeoGnj  
  enum { IDD = IDD_CAPTURE_DIALOG }; 0E{DO<~  
  CComboBox m_Key; wb##|XyK<c  
  BOOL m_bControl; ogJ';i/o  
  BOOL m_bAlt; 6X!jNh$oF  
  BOOL m_bShift; 9j5-/   
  CString m_Path; \zOsq5}  
  CString m_Number; ,H$%'s1I(  
  //}}AFX_DATA C+dz0u3s  
  // ClassWizard generated virtual function overrides u0qTP]  
  //{{AFX_VIRTUAL(CCaptureDlg) N0 mh gEA  
 public: E;q+u[$  
  virtual BOOL PreTranslateMessage(MSG* pMsg); /neY2D6  
 protected: pkTVQdtRG  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support {j4&'=C:  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 5Y@Hb!5D  
  //}}AFX_VIRTUAL Xxj<Ai 2  
  // Implementation XdnpL$0  
 protected: %CUwD  
  HICON m_hIcon; b7gN|Hw5 H  
  // Generated message map functions 6:?mz;oP  
  //{{AFX_MSG(CCaptureDlg) QcjsQTAbk  
  virtual BOOL OnInitDialog(); ^SM5oK  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); vTL/% SJ8  
  afx_msg void OnPaint(); a^Q ?K\c4N  
  afx_msg HCURSOR OnQueryDragIcon(); b tbuE  
  virtual void OnCancel(); |C0!mU  
  afx_msg void OnAbout(); X}ihYM3y/  
  afx_msg void OnBrowse(); aNwx~t]G  
  afx_msg void OnChange(); yf4 i!~  
 //}}AFX_MSG .LbAR u  
 DECLARE_MESSAGE_MAP() $6 4{Ff  
}; <)Y jVGG  
#endif 0r?]b*IEK  
/-(OJN5F^  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file t[AA=  
#include "stdafx.h" !Y/S2J  
#include "Capture.h" <UTO\w%  
#include "CaptureDlg.h" $if(n||  
#include <windowsx.h> 5X uQQ!`  
#pragma comment(lib,"hook.lib") /"^XrVi-  
#ifdef _DEBUG 90ov[|MkM  
#define new DEBUG_NEW ,D&-.`'E  
#undef THIS_FILE g[\8s~g,  
static char THIS_FILE[] = __FILE__; itcM-?  
#endif 1@F>E;YjL=  
#define IDM_SHELL WM_USER+1 4H{$zMq8  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); sLSH`Xy?5  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); :8N{;aui  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Xo6zeLHO  
class CAboutDlg : public CDialog st>%U9  
{ ~D`  
 public: RVF<l?EI4R  
  CAboutDlg(); ^S)t;t@x  
  // Dialog Data 0C6T>E7  
  //{{AFX_DATA(CAboutDlg) p<y \ ^a  
  enum { IDD = IDD_ABOUTBOX }; |D[LU[<C  
  //}}AFX_DATA .&h|r>*|J  
  // ClassWizard generated virtual function overrides 8~O0P=  
  //{{AFX_VIRTUAL(CAboutDlg) pr1kYMrqri  
 protected: dqi31e{*2\  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 0W~1v  
  //}}AFX_VIRTUAL ):n'B` f}z  
  // Implementation !LsIHDs4  
 protected: ;{0%Vp{  
  //{{AFX_MSG(CAboutDlg) ^S(QvoaQ  
  //}}AFX_MSG ']Z%6_WF  
  DECLARE_MESSAGE_MAP() >D_)z/v?"  
}; (-@I'CFd  
Ql,WKoj*  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ?.c:k;j  
{ 0%yPuY>  
 //{{AFX_DATA_INIT(CAboutDlg) oq,*@5xV2  
 //}}AFX_DATA_INIT z+^9)wg9  
} iT+t  
P~PM$e  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) /PG%Y]l0b  
{ n' 1LNi  
 CDialog::DoDataExchange(pDX); t7*F,  
 //{{AFX_DATA_MAP(CAboutDlg) JZE<oQ_Jm  
 //}}AFX_DATA_MAP )r(e\_n  
} cs4IO O$  
ziv+*Qn_b4  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Dw,LB>Eq,  
 //{{AFX_MSG_MAP(CAboutDlg) kZfj"+p_S  
 // No message handlers V}JBv$+ko  
 //}}AFX_MSG_MAP >;}(? +|f  
END_MESSAGE_MAP() yvnvIy  
Rk{vz|  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) zXx A"  
: CDialog(CCaptureDlg::IDD, pParent)  TZdJq  
{ wp@6RJ  
 //{{AFX_DATA_INIT(CCaptureDlg) tv; ?W=&P  
  m_bControl = FALSE; QJI]@3 Y  
  m_bAlt = FALSE; Q v},X~^R  
  m_bShift = FALSE; (.b!kfC  
  m_Path = _T("c:\\"); g O8~$Aj  
  m_Number = _T("0 picture captured."); c57`mOe/b  
  nCount=0; hK3Twzte  
  bRegistered=FALSE; OK z5;#S=  
  bTray=FALSE; AU;Iif6  
 //}}AFX_DATA_INIT |_a^+!P  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 @k/|%%uP  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); \JP9lJ3<  
} T`c:16I  
aLwEz}-   
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 8/~@3-9EK  
{ cq/@ng*o  
 CDialog::DoDataExchange(pDX); tn|H~iF{  
 //{{AFX_DATA_MAP(CCaptureDlg) JQW7y!Z  
  DDX_Control(pDX, IDC_KEY, m_Key); {9~3y2:  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); m,F4N$  
  DDX_Check(pDX, IDC_ALT, m_bAlt); &C#?&AQ  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); -y/Y%]%0  
  DDX_Text(pDX, IDC_PATH, m_Path); 4OG 1_6K  
  DDX_Text(pDX, IDC_NUMBER, m_Number); zXe]P(p<  
 //}}AFX_DATA_MAP `J;g~#/k  
} *QoQ$alHH  
LDDt=HEY4  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) G}nj 71=H  
//{{AFX_MSG_MAP(CCaptureDlg) BNixp[Hc  
 ON_WM_SYSCOMMAND() U:|:Y=O?Q  
 ON_WM_PAINT() w=~X6[+3  
 ON_WM_QUERYDRAGICON() 6g)CpZU  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 0Q]{r )  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) &b]_#c   
 ON_BN_CLICKED(ID_CHANGE, OnChange) 3RI %OCGF  
//}}AFX_MSG_MAP <JW %h :\t  
END_MESSAGE_MAP() 9zpOp-K6  
m;vm7]5  
BOOL CCaptureDlg::OnInitDialog() Lv#}Gm  
{ OZe`>Q6  
 CDialog::OnInitDialog(); NH'QMjL)  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); "_\77cqpTh  
 ASSERT(IDM_ABOUTBOX < 0xF000); GvL\%0Ibx  
 CMenu* pSysMenu = GetSystemMenu(FALSE); $Ut1vp1$  
 if (pSysMenu != NULL) x. /WP~I  
 { Qn/ 6gRLj  
  CString strAboutMenu; o9Tsyjbj  
  strAboutMenu.LoadString(IDS_ABOUTBOX); I0_>ryA  
  if (!strAboutMenu.IsEmpty()) WT1d'@LY  
  { IkQ,#Bsb[  
   pSysMenu->AppendMenu(MF_SEPARATOR); )ZfbM|  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); <"7Wb"+  
  } $8Gj9mw4e'  
 } :7s2M  
 SetIcon(m_hIcon, TRUE); // Set big icon rW*[sLl3  
 SetIcon(m_hIcon, FALSE); // Set small icon ,F=FM>o  
 m_Key.SetCurSel(0); 9ol&p>  
 RegisterHotkey(); !" @<!  
 CMenu* pMenu=GetSystemMenu(FALSE); AzSmfEaU0  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 2WB`+oWox  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); uFfk!  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); w|-m*v .  
 return TRUE; // return TRUE unless you set the focus to a control 1#|qT7  
} OK \9`  
|zy` ]p9  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) +O7GgySx  
{ (b7',:_U7  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) a@C}0IP)  
 {  bDq<]h_7  
  CAboutDlg dlgAbout; 9{-H/YS\_s  
  dlgAbout.DoModal(); I-W ,C &J>  
 } L^Fb;sJYI  
 else q( %)^C  
 { U(hIT9  
  CDialog::OnSysCommand(nID, lParam); N^'(`"J s  
 } yB4eUa!1  
} {gB9EGY  
6U1_Wk?   
void CCaptureDlg::OnPaint() /wi/i*;A  
{ *b"aJ<+  
 if (IsIconic()) sl)]yCD|5  
 { m~gcc  
  CPaintDC dc(this); // device context for painting /#[mV(k  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); hwSxdT6  
  // Center icon in client rectangle  8(}cbW  
  int cxIcon = GetSystemMetrics(SM_CXICON); -+:t%A?  
  int cyIcon = GetSystemMetrics(SM_CYICON); }wC=p>zA  
  CRect rect; Wp^ A.  
  GetClientRect(&rect); _TbvQ Y  
  int x = (rect.Width() - cxIcon + 1) / 2; -=qHwcId  
  int y = (rect.Height() - cyIcon + 1) / 2; U[hokwZ  
  // Draw the icon !j9(%,PR  
  dc.DrawIcon(x, y, m_hIcon); *56q4\1  
 } M`?ATmYy  
 else MTn}]blH  
 { Mz;KXP  
  CDialog::OnPaint(); Eg1|Kg\&  
 } r>t|.=!  
} b6@0?_n  
'K|F{K  
HCURSOR CCaptureDlg::OnQueryDragIcon() (w Q,($@  
{ 5.lg*vh  
 return (HCURSOR) m_hIcon; [+qB^6I+P%  
} 9jllW[`2F  
/Y [ b8f  
void CCaptureDlg::OnCancel() 1{G@'# (  
{ a@#<qf8g  
 if(bTray) ~31-)*tJ]  
  DeleteIcon(); jm[f|4\  
  CDialog::OnCancel(); M[L@ej  
} x)f<lZ^L&H  
CH$* =3M  
void CCaptureDlg::OnAbout() B. #-@  
{ )2R]KU_=g  
 CAboutDlg dlg; e<"sZK  
 dlg.DoModal(); 1czU$!MV  
} #,OiZQJC  
jIWX6  
void CCaptureDlg::OnBrowse() #y1M1Og  
{ GQ*or>R1  
 CString str; Cf@N>N#t)  
 BROWSEINFO bi; 3Q_)Xs r`  
 char name[MAX_PATH]; 8cj}9}k  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); QG09=GQ  
 bi.hwndOwner=GetSafeHwnd(); 35YDP|XZb  
 bi.pszDisplayName=name; KD'}9{F,  
 bi.lpszTitle="Select folder"; |j4;XaG)  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; DK#Tr: 7  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 2 y& k  
 if(idl==NULL) yg"FF:^T  
  return; 5w</Ga  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); `(~oZbErM  
 str.ReleaseBuffer(); r`PD}6\  
 m_Path=str; @y,>cDg  
 if(str.GetAt(str.GetLength()-1)!='\\') Nk?/vMaw  
  m_Path+="\\"; !)FKF7'  
 UpdateData(FALSE); ![m6$G{y  
} aF.fd2k  
^C;ULUn3  
void CCaptureDlg::SaveBmp() 4K >z?jd  
{ JY$;m3h  
 CDC dc; 'w_Qs~6~{  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ](z*t+">  
 CBitmap bm; %5j*e  
 int Width=GetSystemMetrics(SM_CXSCREEN); Pe` jNiI  
 int Height=GetSystemMetrics(SM_CYSCREEN); 5PE}3he:  
 bm.CreateCompatibleBitmap(&dc,Width,Height);  x(A6RRh  
 CDC tdc; n{"a 0O  
 tdc.CreateCompatibleDC(&dc); 2W;2._  
 CBitmap*pOld=tdc.SelectObject(&bm); Uq.hCb`:  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); .v['INK9  
 tdc.SelectObject(pOld); L!~ap  
 BITMAP btm; {}BAQ9|q  
 bm.GetBitmap(&btm); LB^xdMXi  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Nu+DVIM  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); F:LrQu  
 BITMAPINFOHEADER bih; Cw~fP[5XMF  
 bih.biBitCount=btm.bmBitsPixel; $rPQ%2eF4  
 bih.biClrImportant=0; A&X XL~yH  
 bih.biClrUsed=0; ~\ v"xV  
 bih.biCompression=0; WLCr~r^  
 bih.biHeight=btm.bmHeight; "lL/OmG  
 bih.biPlanes=1; f\H1$q\p\  
 bih.biSize=sizeof(BITMAPINFOHEADER); t<e3EW@>>  
 bih.biSizeImage=size; kT:?1w'  
 bih.biWidth=btm.bmWidth; Ka$lNL3<j  
 bih.biXPelsPerMeter=0; br*PB]dU  
 bih.biYPelsPerMeter=0; x::d}PP7  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); #j"GS/y"  
 static int filecount=0; 54oJ MW9  
 CString name; c~!ETwpHQ  
 name.Format("pict%04d.bmp",filecount++); Nr`v|_U  
 name=m_Path+name; N\Ab0mDOV.  
 BITMAPFILEHEADER bfh; D0h6j0r 5  
 bfh.bfReserved1=bfh.bfReserved2=0; hbs /S  
 bfh.bfType=((WORD)('M'<< 8)|'B'); /`j2%8^N  
 bfh.bfSize=54+size; P[jh^!<j  
 bfh.bfOffBits=54; aTs9lr:  
 CFile bf; 6#HnA"I2n  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ $ SZIJe"K  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); w7f)v\p  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); #p-\Y7f  
  bf.WriteHuge(lpData,size); tMyMA}`  
  bf.Close(); BJ{?S{"6%G  
  nCount++; j_S3<wEJ  
 } A:5P  
 GlobalFreePtr(lpData); a>k9& w  
 if(nCount==1) {,= hIXo>  
  m_Number.Format("%d picture captured.",nCount); co' qVsOiH  
 else t<%+))b  
  m_Number.Format("%d pictures captured.",nCount); x!u6LDq0  
  UpdateData(FALSE); F1p|^hYDW  
} gBZNO! a,d  
$paE6X^  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) /Z]hX*QR  
{ TV}=$\D  
 if(pMsg -> message == WM_KEYDOWN) 7**zO3 H  
 { *p|->p6,u  
  if(pMsg -> wParam == VK_ESCAPE) V>ZDJW"G!  
   return TRUE; OK2\2&G  
  if(pMsg -> wParam == VK_RETURN) S(lqj6aa}  
   return TRUE; r>G||/Z  
 } }TDq7-(g  
 return CDialog::PreTranslateMessage(pMsg); bnV)f<  
} 1;vwreJ  
a~zh5==QD  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Yx](3w ID  
{ wkT4R\H>  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ^c| 0?EH  
  SaveBmp(); 0UQ DB5u  
  return FALSE; mFE7#OM  
} J~ wu*x  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ o_r{cnu  
 CMenu pop; 01IfvK  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); x[$ :^5V  
 CMenu*pMenu=pop.GetSubMenu(0); 1"T&B0G3l  
 pMenu->SetDefaultItem(ID_EXITICON); z]j_,3Hff  
 CPoint pt; 3w! NTvp  
 GetCursorPos(&pt); S}K-\[i?  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); <iM}p^jX9  
 if(id==ID_EXITICON) f?"909&  
  DeleteIcon(); 5,R<9FjW  
 else if(id==ID_EXIT) w7~&Xxa/  
  OnCancel(); t`1~5#?Du(  
 return FALSE; f1U: _V^d  
} ?:W=ddg  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); (AHTv8  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) $C8s  
 AddIcon(); Vb?_RE_H  
 return res; #*G}v%Ow/u  
} >,f5 5  
bLUyZ3m!  
void CCaptureDlg::AddIcon() xP 3>8Y  
{ 7s;*vd>  
 NOTIFYICONDATA data; axv-U dE;  
 data.cbSize=sizeof(NOTIFYICONDATA); ##U/Wa3  
 CString tip; z@2nre  
 tip.LoadString(IDS_ICONTIP); >8injW3 52  
 data.hIcon=GetIcon(0); I2?g'tz  
 data.hWnd=GetSafeHwnd(); +lJD7=%K]Z  
 strcpy(data.szTip,tip); 2F:X:f  
 data.uCallbackMessage=IDM_SHELL; $EZr@n  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; P}-S[[b73s  
 data.uID=98; x^ sTGd  
 Shell_NotifyIcon(NIM_ADD,&data); t0)hd X  
 ShowWindow(SW_HIDE); Rz33_ qA  
 bTray=TRUE; &>XSQB(&%  
} 5NMju!/  
p0HcuB)Y  
void CCaptureDlg::DeleteIcon() [V;Q#r&+  
{ dV"Kx  
 NOTIFYICONDATA data; D+*_iM6[-  
 data.cbSize=sizeof(NOTIFYICONDATA); T7*p! 0  
 data.hWnd=GetSafeHwnd(); hy@e(k|S]U  
 data.uID=98; dj3E20Ws  
 Shell_NotifyIcon(NIM_DELETE,&data); WQHlf 0]  
 ShowWindow(SW_SHOW); 'z Qp64]F  
 SetForegroundWindow(); I@q4D1g  
 ShowWindow(SW_SHOWNORMAL); AaJz3oncJ  
 bTray=FALSE; gR k+KGKn<  
} }do=lm?/  
*)i+c{~  
void CCaptureDlg::OnChange() 1@Rl^ey  
{ 6CzN[R}  
 RegisterHotkey(); R<ZyP~  
} $p.0[A(N  
1$uO%  
BOOL CCaptureDlg::RegisterHotkey() pg4jPuCM  
{ ffh3okyW0  
 UpdateData(); C-VkXk  
 UCHAR mask=0; ['@R]Si"!  
 UCHAR key=0; Fx@@.O6  
 if(m_bControl) 5i&+.?(Z=  
  mask|=4; (%|L23  
 if(m_bAlt) )}T0SGY  
  mask|=2; !*=+E%7  
 if(m_bShift) | PzXN+DW  
  mask|=1; P!lTK   
  key=Key_Table[m_Key.GetCurSel()]; k0-,qM#p;X  
 if(bRegistered){ = k>ygD_  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ,F0bkNBG  
  bRegistered=FALSE; #jX%nqMxW  
 } > 0NDlS%Q:  
 cMask=mask; #W=H)6  
 cKey=key; r!O4]j_3  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); $4]"g}_  
 return bRegistered; ^+Stvj:N  
} {#uf#J|  
|PW.CV0,  
  四、小结 h%(0|  
sBWLgJz?C  
  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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