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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: ]2SF9p_  
  'cZN{ZMWG  
  一、实现方法 4\otq%Y  
1`bl&}6l|E  
  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: I s57F4[}  
IND]j72  
#pragma data_seg("shareddata") i&Fiq&V)[  
HHOOK hHook =NULL; //钩子句柄 9]'&RyH=#  
UINT nHookCount =0; //挂接的程序数目 {jKI^aC<[  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 V\5 L?}  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 1QqHF$S  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey cW8\d  
static int KeyCount =0; F'm(8/A$  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 i{c@S:&@^  
#pragma data_seg() 95W?{> @  
h11.'Eej`  
  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。 %b2oiKSBx?  
csZ c|kDI  
  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: <W)u{KS#TY  
A=5epsB  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ksR1k vTm  
cKey,UCHAR cMask) eet Q}]  
{ Q4*-wF-P  
 BOOL bAdded=FALSE; ?DV5y|}pj  
 for(int index=0;index<MAX_KEY;index++){ ~ Hy,7  
  if(hCallWnd[index]==0){ 5II(mSg8  
   hCallWnd[index]=hWnd; 2;3f=$3  
   HotKey[index]=cKey; =}!Mf'  
   HotKeyMask[index]=cMask; # uCB)n&.  
   bAdded=TRUE; [/ M^[p  
   KeyCount++; E6B!+s!]  
   break; *LC+ PZV@  
  } P$GjF-!:  
 } Mj=$y?d ]  
 return bAdded; 24c ek  
} } R4c  
//删除热键 cE'L% Z  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;lX(}2tXW  
{ E.bi05l  
 BOOL bRemoved=FALSE; bvBHYf:^  
 for(int index=0;index<MAX_KEY;index++){ siDh="{s  
  if(hCallWnd[index]==hWnd){ 13'vH]S$M  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ $ <8~k^  
    hCallWnd[index]=NULL; @F*wg  
    HotKey[index]=0; fl\aqtF  
    HotKeyMask[index]=0; J8a*s`ik  
    bRemoved=TRUE; "6ECgyD+E!  
    KeyCount--; `Mj}md;O"  
    break; Sw&!y$ed  
   } 0JuD ^  
  } TJ8E"t*)  
 } 1nknSw#  
 return bRemoved; {:nQl}  
} HmmS(fU  
g9fq5E<G  
`Hx~UH)  
  DLL中的钩子函数如下: ,B}I?vN.  
t>)45<PEw  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) qSCv )S(  
{ :wqC8&V  
 BOOL bProcessed=FALSE; F|bYWYED;  
 if(HC_ACTION==nCode) t+r:"bb  
 { va|*c22;|  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Uh1NO&i.W  
   switch(wParam) ?']h%'Q  
   {  /e}#' H   
    case VK_MENU: =QJRMF  
     MaskBits&=~ALTBIT; [k$*4 u >  
     break; CI:^\-z  
    case VK_CONTROL: Z=5qX2fy1*  
     MaskBits&=~CTRLBIT; ppIbjt6r  
     break; S/ywA9~3Q  
    case VK_SHIFT: g.JN_t5  
     MaskBits&=~SHIFTBIT; x"P);su  
     break; ?rX]x8iP  
    default: //judge the key and send message HS>f1!  
     break; ,6^ znOt  
   } C`jM0Q  
   for(int index=0;index<MAX_KEY;index++){ d'6|:z9c  
    if(hCallWnd[index]==NULL) w@\vHH.;V  
     continue; hG~reVNf  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @Y,7'0U  
    { #3=P4FUz.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ?Ucu#UO  
     bProcessed=TRUE; sd#|3  
    } 3ss6_xd+  
   } ^>y@4qB  
  } 2 !" XzdD  
  else if((lParam&0xc000ffff)==1){ //有键按下 V==z"  
   switch(wParam) $/1c= Y@  
   { f&,{XZ  
    case VK_MENU: . v@>JZC  
     MaskBits|=ALTBIT; OX:O^ (-r,  
     break; qH,l#I\CG  
    case VK_CONTROL: Fk;o E'"D  
     MaskBits|=CTRLBIT; {+<P:jbz;  
     break; 2g9 G{~,@g  
    case VK_SHIFT: # {fTgq  
     MaskBits|=SHIFTBIT; RyB~Lm`ZK%  
     break; X;F?:Iw\  
    default: //judge the key and send message 8;Fn7k_Uf  
     break; V}o n|A  
   } 39F O f  
   for(int index=0;index<MAX_KEY;index++){ M~*u;vA/  
    if(hCallWnd[index]==NULL) |IoB?^_h  
     continue; IL/Yc1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -F"Q EL#  
    { Rv,JU6>i  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); I V%VU  
     bProcessed=TRUE; )Rat0$6  
    } 9mc!bj^811  
   } R2L;bGI*J  
  } ./j,Z$|  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 |wEN`#.;b  
   for(int index=0;index<MAX_KEY;index++){ o'~5pS(wq  
    if(hCallWnd[index]==NULL) -V"22sR]  
     continue; K ]OK:hY4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Uawpfgc}  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); $GQ`clj<  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 _sE#)@p  
   } @;xMs8@  
  } I|-p3g8\  
 } ?;YC'bF  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Ll4bdz,  
} C'=k&#<-  
!|q<E0@w\  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: %S` v!*2  
YJS{i  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &bz:K8c  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1pv}]&X  
o~FRF0f*VP  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 'Djm0  
*tOG*hwdT  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ' /Bidb?  
{ UmnE@H"t$\  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) !{n<K:x1  
 { 6J~12TU,  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 o[ENp'r  
  SaveBmp(); O<)y-nx;X  
  return FALSE; 22<0DhJ  
 } ki0V8]HP  
 …… //其它处理及默认处理 MF6 0-VE  
} FEPXuCb  
"xMD,}+5$$  
&bqT /H18  
  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。 }7G8|54t  
MC 0TaP  
  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。 dt[k\ !-v  
mDGn:oRj  
  二、编程步骤 @cRZk`|1n  
P X;Ed*y  
  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"; /:<IIqO.  
_UE)*l m+  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; z|?R/Gf8  
hqk}akXt  
  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; h=kQ$`j6  
iyVB3:M  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; 0w'j+  
gef6pfV  
  5、 添加代码,编译运行程序。 /sR%]q |L  
j` E +qk  
三、程序代码 sC00un%  
S~qZr  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL d0hhMx6$  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Y $g$x<7  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ p\C%%  
#if _MSC_VER > 1000 Obw?_@X  
#pragma once Z3 ;!l  
#endif // _MSC_VER > 1000 C8#@+Q.  
#ifndef __AFXWIN_H__ ~9F,%  
#error include 'stdafx.h' before including this file for PCH 4E8JT#&  
#endif Xd:7"/:r  
#include "resource.h" // main symbols M,j(=hRJ/E  
class CHookApp : public CWinApp zPEg  
{ juAMAplf  
 public: dX8hpQ  
  CHookApp(); #B'aU#$u  
  // Overrides + SZYg[  
  // ClassWizard generated virtual function overrides 5_0(D;Q  
  //{{AFX_VIRTUAL(CHookApp) &X9Z W$C  
 public: xRu Fuf8  
  virtual BOOL InitInstance(); C ]Si|D  
  virtual int ExitInstance(); 6m.k;'  
  //}}AFX_VIRTUAL ~,D@8tv  
  //{{AFX_MSG(CHookApp) p3ISWJa!  
  // NOTE - the ClassWizard will add and remove member functions here. `"iY*  
  // DO NOT EDIT what you see in these blocks of generated code ! Q@e[5RA +]  
  //}}AFX_MSG Mcw4!{l`  
  DECLARE_MESSAGE_MAP() n[Zz]IO,g  
}; , "jbq~  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); >Sa*`q3J  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); r _,_5 @0e  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); MyJ4><oG  
BOOL InitHotkey(); z|G9,:9  
BOOL UnInit(); $d+DDm1o  
#endif j9qREf9)  
f:zFFpP.j@  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. @=w<B4 L  
#include "stdafx.h" `=#01YX[0  
#include "hook.h" a m-b!l!q^  
#include <windowsx.h> UH@a s  
#ifdef _DEBUG 2:}fe}  
#define new DEBUG_NEW U,/6;}  
#undef THIS_FILE eLwTaW !C  
static char THIS_FILE[] = __FILE__; QU{Ech'  
#endif r8xyd"Axy  
#define MAX_KEY 100 71#I5*8  
#define CTRLBIT 0x04 Z'pQ^MO  
#define ALTBIT 0x02 gw+9x<e  
#define SHIFTBIT 0x01 e73^#O&Xt  
#pragma data_seg("shareddata") d{et8N  
HHOOK hHook =NULL; nmlPX7!{$  
UINT nHookCount =0; E{=2\Wkcp  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey  O#nR>1h  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT _ 7oV<  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey k<w(i k1bi  
static int KeyCount =0; )T907I|  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift l=`L7| ^/d  
#pragma data_seg() @vgG1w  
HINSTANCE hins; ezhDcI_T  
void VerifyWindow(); [MX;,%;;  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) |( (zTf  
//{{AFX_MSG_MAP(CHookApp) [#" =yzR<3  
// NOTE - the ClassWizard will add and remove mapping macros here. *y`%]Hy<  
// DO NOT EDIT what you see in these blocks of generated code! 3 <|`0pt}  
//}}AFX_MSG_MAP /|{,sWf2  
END_MESSAGE_MAP() d "BW/%m|g  
@Un/c:n  
CHookApp::CHookApp() r#WT`pav  
{ J )BI:]m  
 // TODO: add construction code here, Y9SGRV(  
 // Place all significant initialization in InitInstance (VyNvB  
} v8>v.}y  
U5Erm6U:  
CHookApp theApp; Ot&:mT!2  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) YF#H Sf7  
{ 8$xPex~2  
 BOOL bProcessed=FALSE; l>lW]W  
 if(HC_ACTION==nCode) fkfZ>D^1  
 { ?wMHS4  
  if((lParam&0xc0000000)==0xc0000000){// Key up K*K1(_x=  
   switch(wParam) Vi! Q  
   { Xog/O i  
    case VK_MENU: )g| BMmB  
     MaskBits&=~ALTBIT; wYeB)1.  
     break; h*0S$p<[1  
    case VK_CONTROL: N\t1T(C|  
     MaskBits&=~CTRLBIT; N5|Rmfo1  
     break; y;" n9  
    case VK_SHIFT: 7>o .0  
     MaskBits&=~SHIFTBIT; y#ON|c /  
     break; 9D@$i<D:  
    default: //judge the key and send message PDx)S7+w[  
     break; -9P2`XQ^  
   } ,Y_{L|:w  
   for(int index=0;index<MAX_KEY;index++){ C>^D*C(  
    if(hCallWnd[index]==NULL) 9z m|Lbj  
     continue; m(D]qYwh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) k0?ZYeHC  
    { Ue5O9;y]u  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); U IJx*  
     bProcessed=TRUE; t$& Qv)  
    } ,lY aA5&I  
   } ${~|+zdB  
  } Itm8b4e9;  
  else if((lParam&0xc000ffff)==1){ //Key down &0N<ofYX  
   switch(wParam) 4}v@C|.p  
   { 5`^o1nGO'  
    case VK_MENU: *E>.)B i  
     MaskBits|=ALTBIT; ;sdN-mb  
     break; !}TMiCK  
    case VK_CONTROL: $<@\-vYvr@  
     MaskBits|=CTRLBIT; ]7sx;KFv  
     break; p?(L'q"WK  
    case VK_SHIFT: {B$2"q/~  
     MaskBits|=SHIFTBIT; x!S;SU  
     break; Ftb%{[0}u3  
    default: //judge the key and send message O/AE}]  
     break; xIbMs4'iEx  
   } k@!r#`j3  
   for(int index=0;index<MAX_KEY;index++) 4YG/`P  
   { x  FJg  
    if(hCallWnd[index]==NULL) F SMj  
     continue; KM?1/KZ/~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) R5Yl1   
    { /z."l!u6  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 7D"%%|: h  
     bProcessed=TRUE; D  _X8-  
    } &!.HuRiuC  
   } 9pWy"h$H  
  } n/e BE q  
  if(!bProcessed){ 8``;0}'PC  
   for(int index=0;index<MAX_KEY;index++){ <~Q i67I  
    if(hCallWnd[index]==NULL) U0B2WmT~Q  
     continue; wjU.W5IR  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) UP1?5Q=H]Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); cleOsj;S  
   } 2F_ R/{D  
  } ?v]-^X=&  
 } rp! LP#*  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); E,G<_40  
} ;#?M)o:q  
mxTk+j=  
BOOL InitHotkey() Ry;$^.7%  
{ Q ~|R Z7G  
 if(hHook!=NULL){ O_@2;iD^^  
  nHookCount++; T(X:Yw  
  return TRUE; -mNQ;zI1  
 } IY(h~O  
 else dT@UK^\  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 4z4v\IpB  
  if(hHook!=NULL) o.:p_(|hI  
   nHookCount++; ~GB=Nz  
  return (hHook!=NULL); 85U.wpG  
} _"f  :`  
BOOL UnInit() 'E]A.3-Mt  
{ Ng<1Sd|MV  
 if(nHookCount>1){ ~&G4)AM  
  nHookCount--; g#^|oYuH6  
  return TRUE; /F[+13C  
 } `_AM` >_  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 0LVE@qEL  
 if(unhooked==TRUE){ 0A$SYF$O+[  
  nHookCount=0; oN2=DYC41  
  hHook=NULL; i S p  
 } CDg AGy  
 return unhooked; 60B-ay0e$b  
} rnhFqNT:  
Bt~s*{3$8  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) E{^^^"z P  
{ :xeLt;  
 BOOL bAdded=FALSE; *_hLD5K!  
 for(int index=0;index<MAX_KEY;index++){ L ^Y3=1#"g  
  if(hCallWnd[index]==0){ 2wpjU&8W!  
   hCallWnd[index]=hWnd; a0_(eO-S  
   HotKey[index]=cKey; )*1.eObhL  
   HotKeyMask[index]=cMask; ksI>IW  
   bAdded=TRUE; #!#z5DJu  
   KeyCount++; ] pPz@@xx  
   break; /)#8)"`nT  
  } @ RR\lZ  
 } R9dP,<2  
 return bAdded; BA+_C]%ZJ  
} L'kq>1QWf  
r2eQ{u{nX  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) mBl7{w;Iv  
{ =& U`9qN  
 BOOL bRemoved=FALSE; mN1Ssq"B  
 for(int index=0;index<MAX_KEY;index++){ n.$(}A  
  if(hCallWnd[index]==hWnd){ ijZ>:B2:  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ *Zkss   
    hCallWnd[index]=NULL; rY70 ^<z  
    HotKey[index]=0; vZjZb(jlN  
    HotKeyMask[index]=0; : }?{@#Z  
    bRemoved=TRUE; ZlR!s!vv  
    KeyCount--; Aka^e\Y@6*  
    break; 'Ji+c  
   } 2w1tK  
  } M []OHw  
 } >Q2). E  
 return bRemoved; R{3CW^1  
} it}-^3A M  
LpWI>sNv  
void VerifyWindow() 9N Le&o  
{ l]5%  
 for(int i=0;i<MAX_KEY;i++){ F$Pp]"82'm  
  if(hCallWnd!=NULL){ K3ukYR  
   if(!IsWindow(hCallWnd)){ $Ub}p[L  
    hCallWnd=NULL; U6{dI@|B  
    HotKey=0; 4;<DJ.XlN=  
    HotKeyMask=0; h5onRa *7  
    KeyCount--; pMN<p[MB  
   } Y6eEGo"K.+  
  } S<oQ}+4[~  
 } iHz[Zw^.s  
} hx!`F  
v]bAWo  
BOOL CHookApp::InitInstance() f=ib9WbR#  
{ TETsg5#  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); .hN3`>*V  
 hins=AfxGetInstanceHandle(); h~ha  
 InitHotkey(); rSyaZ6#  
 return CWinApp::InitInstance(); 0j@IxEPs  
} lgT?{,>RkW  
Z{}+)Q*Q  
int CHookApp::ExitInstance() dF,DiRD  
{ i$O#%12l  
 VerifyWindow(); XiG88Kwv  
 UnInit(); &%e"9v2`  
 return CWinApp::ExitInstance(); )BLmoJOf  
}  U42\.V0  
1g i}H)  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ay[+2"  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) E^syrEz  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ L?f qcW{  
#if _MSC_VER > 1000 bj.]o*u-  
#pragma once V_]-`?S  
#endif // _MSC_VER > 1000 oNSz&)LP  
MZ^Ch   
class CCaptureDlg : public CDialog # U`&jBU  
{ }#YQg0(  
 // Construction r5)f82pQ  
 public: \UQ],+H  
  BOOL bTray; GTFl}t  
  BOOL bRegistered; 4~WlP,,M  
  BOOL RegisterHotkey(); lt%-m@#/  
  UCHAR cKey; we a\8[U3"  
  UCHAR cMask; +~:0Dxv W  
  void DeleteIcon(); N7B}O*;  
  void AddIcon(); AzX(~Qc  
  UINT nCount; qS82/e)7  
  void SaveBmp(); s=jO; K$  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor `w=!o.1  
  // Dialog Data riEqW}{  
  //{{AFX_DATA(CCaptureDlg) )`RZkCe  
  enum { IDD = IDD_CAPTURE_DIALOG }; Ap,q `S  
  CComboBox m_Key; K!b>TICa:  
  BOOL m_bControl; ]}_,U!`8  
  BOOL m_bAlt; "0Y&~q[=  
  BOOL m_bShift; L4mTs-M.  
  CString m_Path; hGKdGu`0  
  CString m_Number; *EE|?vn  
  //}}AFX_DATA bgXc_>T6_y  
  // ClassWizard generated virtual function overrides ~p!QSRu~,b  
  //{{AFX_VIRTUAL(CCaptureDlg) cFxSDTR  
 public: [r~~=b7*[  
  virtual BOOL PreTranslateMessage(MSG* pMsg);  RA~_]Hk  
 protected: F~P/*FFK  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support c$.T<r)Z  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); P#9-bYNU  
  //}}AFX_VIRTUAL JgZdS-~  
  // Implementation lc-*8eS  
 protected: +{bh  
  HICON m_hIcon; gU*I;s>  
  // Generated message map functions >hesxC!  
  //{{AFX_MSG(CCaptureDlg) CY\mU_.b  
  virtual BOOL OnInitDialog(); y7 <(,uT  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); /^WE@r[:  
  afx_msg void OnPaint(); )xbqQW7%0+  
  afx_msg HCURSOR OnQueryDragIcon(); 7dx4~dF  
  virtual void OnCancel(); rr6"Y&v  
  afx_msg void OnAbout(); 6P6Jx;  
  afx_msg void OnBrowse(); k dUc&  
  afx_msg void OnChange(); QD6Z=>?S  
 //}}AFX_MSG l>33z_H^  
 DECLARE_MESSAGE_MAP() ";58B} ki  
}; $o: :PDQ?  
#endif w7[0  
zkvH=wL  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file gGD]t;<u  
#include "stdafx.h" m R"9&wq  
#include "Capture.h"  2fbvU  
#include "CaptureDlg.h" LDSbd,GF  
#include <windowsx.h> yl|R:/2V  
#pragma comment(lib,"hook.lib") PK9Qm'W b  
#ifdef _DEBUG Pyit87h{  
#define new DEBUG_NEW r]Z.`}Kkm  
#undef THIS_FILE T&e%/  
static char THIS_FILE[] = __FILE__; DwQp$l'NfW  
#endif HJ(=?TU  
#define IDM_SHELL WM_USER+1 |O'Hh7  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %0go%_  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); P}b Dn;  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; \>_eEZ5  
class CAboutDlg : public CDialog <kk'v'GW@  
{ 72% {Wh/  
 public: ~9]Vy (L  
  CAboutDlg(); + >Fv*lux  
  // Dialog Data j= p|'`  
  //{{AFX_DATA(CAboutDlg) :K5V/-[|V1  
  enum { IDD = IDD_ABOUTBOX }; f2 VpeJ<p  
  //}}AFX_DATA FxMMxY,*%  
  // ClassWizard generated virtual function overrides S:DcfR=a  
  //{{AFX_VIRTUAL(CAboutDlg) + 4++Z  
 protected: :  ,|=Q}  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support (u$!\fE-et  
  //}}AFX_VIRTUAL c lq <$-  
  // Implementation 8VKb*  
 protected: bK6, saN>  
  //{{AFX_MSG(CAboutDlg) 4 {uJ||!  
  //}}AFX_MSG vjY);aQ  
  DECLARE_MESSAGE_MAP() R#r h  
}; h/w]  
sT@u3^>  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) (gv=P>:  
{ i] V F'tG  
 //{{AFX_DATA_INIT(CAboutDlg) * N2#{eF&]  
 //}}AFX_DATA_INIT * , |)~$=>  
} QLxXp  
N2M?5fF  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) q oKQEG2  
{ Z z{[Al{  
 CDialog::DoDataExchange(pDX); K7YT0cG  
 //{{AFX_DATA_MAP(CAboutDlg) |Sy}d[VKsZ  
 //}}AFX_DATA_MAP +<vqkc  
} )@?Qt2  
bUpmU/ RW  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) jauc*347  
 //{{AFX_MSG_MAP(CAboutDlg) g#pIMA#/  
 // No message handlers jKe$&.q@  
 //}}AFX_MSG_MAP >:(6{}b  
END_MESSAGE_MAP() K]lb8q}Z~  
_&6juBb  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ~`a#h#  
: CDialog(CCaptureDlg::IDD, pParent) h/fb<jIP1  
{ $u(M 4(}  
 //{{AFX_DATA_INIT(CCaptureDlg) hPNQGVv  
  m_bControl = FALSE; _Y:Ja0,  
  m_bAlt = FALSE; U:C-\ M  
  m_bShift = FALSE; fbW,0  
  m_Path = _T("c:\\"); 23.y3t_?  
  m_Number = _T("0 picture captured."); J?UZN^  
  nCount=0; =2GP^vh  
  bRegistered=FALSE; T% jjs  
  bTray=FALSE; e%5'(V-y,  
 //}}AFX_DATA_INIT \ZmFH8=|f  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ^H y)<P  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ?kG#qt]Q5  
} &z 1|  
^loF#d= s  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) |R:v<  
{ 3/#R9J#  
 CDialog::DoDataExchange(pDX); !kjr> :)x  
 //{{AFX_DATA_MAP(CCaptureDlg) v>yGsJnV'  
  DDX_Control(pDX, IDC_KEY, m_Key); , .NG.Q4f  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); N23+1h  
  DDX_Check(pDX, IDC_ALT, m_bAlt); B[2h   
  DDX_Check(pDX, IDC_SHIFT, m_bShift); I=3B 5u  
  DDX_Text(pDX, IDC_PATH, m_Path); ".Q!8j"@f  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 'IqK M  
 //}}AFX_DATA_MAP (PE8H~d  
} d[qEP6B  
%s&E-*X  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) &,6y(-  
//{{AFX_MSG_MAP(CCaptureDlg) t8a@L(J$  
 ON_WM_SYSCOMMAND() UH.}B3H   
 ON_WM_PAINT() s|rZ>SLL  
 ON_WM_QUERYDRAGICON() Z1qATX Xf  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) GwU>o:g"  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) vb80J<4  
 ON_BN_CLICKED(ID_CHANGE, OnChange) b*F :l#  
//}}AFX_MSG_MAP AU${0#WV_  
END_MESSAGE_MAP() /oix tO)  
C$Hl`>?$  
BOOL CCaptureDlg::OnInitDialog() (qq$y #$  
{ cVv4gQD\  
 CDialog::OnInitDialog(); (tz_D7c$F  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); }tS6Z:fOY  
 ASSERT(IDM_ABOUTBOX < 0xF000); Ke;X3j ]`  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 5;i!PuL  
 if (pSysMenu != NULL) k(vEp ]  
 { xs83S.fHg  
  CString strAboutMenu; !xx> lX5  
  strAboutMenu.LoadString(IDS_ABOUTBOX); \p=W4W/  
  if (!strAboutMenu.IsEmpty()) _|5FrN  
  { ~_^o?NE,  
   pSysMenu->AppendMenu(MF_SEPARATOR); Yqz[sz5+m  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ky lrf4=  
  } ^|hRu{Q W  
 } KTAe~y  
 SetIcon(m_hIcon, TRUE); // Set big icon %NAFU /&  
 SetIcon(m_hIcon, FALSE); // Set small icon X6"^:)&1M  
 m_Key.SetCurSel(0); yADN_  
 RegisterHotkey(); (w@MlMk  
 CMenu* pMenu=GetSystemMenu(FALSE); #B.w7y5*  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Osvz 3UMY3  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); (^s&#_w03  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); PU/Br;2A  
 return TRUE; // return TRUE unless you set the focus to a control "3KSmb   
} %?9r(&  
R4rm>zisVX  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) O|7{%5h  
{ "}~i7NBB  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Hr8$1I$=  
 { SpTORR8  
  CAboutDlg dlgAbout; XCi]()TZ_  
  dlgAbout.DoModal(); j*Wh;I+h  
 } q MT.7n:  
 else -GkK[KCH  
 { #SLxNAH  
  CDialog::OnSysCommand(nID, lParam); S&)) 0d  
 } FsPDWy&x  
} 4+?ZTc(  
6L`+ z  
void CCaptureDlg::OnPaint() gp&& c,  
{ Hk~ gcG  
 if (IsIconic()) :`"T Eif  
 { 6xzR*~ 7  
  CPaintDC dc(this); // device context for painting EwBN+v;)  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); SAxa7B/U2  
  // Center icon in client rectangle "6o}qeB l  
  int cxIcon = GetSystemMetrics(SM_CXICON); `J7Lecgo  
  int cyIcon = GetSystemMetrics(SM_CYICON); f[I'j0H%  
  CRect rect; pN f9  
  GetClientRect(&rect); ]ieA?:0Hi  
  int x = (rect.Width() - cxIcon + 1) / 2; _Ag/gu2-?  
  int y = (rect.Height() - cyIcon + 1) / 2; ~FCSq:_  
  // Draw the icon JLV}Fw  
  dc.DrawIcon(x, y, m_hIcon); AL$ Ty  
 } mP .&fS  
 else dK(%u9v  
 { <B{VL8IA>  
  CDialog::OnPaint(); Wv*BwiQ  
 } $^D(%  
} (>5VS  
 yLIj4bf  
HCURSOR CCaptureDlg::OnQueryDragIcon() :AcN b  
{ t~W4o8<w  
 return (HCURSOR) m_hIcon; % oL&~6l$  
} SoGLsO+R  
f]6` GsE  
void CCaptureDlg::OnCancel() [W|7r n,q  
{ bz@=zLBt  
 if(bTray) 7'/2:"  
  DeleteIcon(); WUK.>eM0  
  CDialog::OnCancel(); =O:ek#Bp  
} 4Z p5o`*g2  
88=FPEU  
void CCaptureDlg::OnAbout() 8cPf0p:  
{ I%b:Z  
 CAboutDlg dlg; $cpQ7  
 dlg.DoModal(); W]Y!ZfGnN  
} =|&"/$+s  
A_*Lo6uII  
void CCaptureDlg::OnBrowse() 9n\#s~,  
{ p1gX4t]%}a  
 CString str; y!c7y]9__2  
 BROWSEINFO bi; =v`&iL~m  
 char name[MAX_PATH]; y^|3]G3  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); j%y+W{Q[  
 bi.hwndOwner=GetSafeHwnd(); l )V43  
 bi.pszDisplayName=name; KXbYv62  
 bi.lpszTitle="Select folder"; f I-"8f0_  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; F$yFR  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); h \cK  
 if(idl==NULL) 0BP~ 0z  
  return; | xI_aYv*  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ^V,/4u  
 str.ReleaseBuffer(); E6-(q!"A  
 m_Path=str; N$a-i  
 if(str.GetAt(str.GetLength()-1)!='\\') ;Kb[UZ1  
  m_Path+="\\"; $>s@T(  
 UpdateData(FALSE); 7MJ)p$&  
} Z q>.;>  
QM=436fq  
void CCaptureDlg::SaveBmp() kc']g:*]Y  
{ WK)k-A^q  
 CDC dc; Ywk[VD+.  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); kJpHhAn4  
 CBitmap bm; 2Xs< 1rF  
 int Width=GetSystemMetrics(SM_CXSCREEN); $"n)C  
 int Height=GetSystemMetrics(SM_CYSCREEN); <=2*UD |  
 bm.CreateCompatibleBitmap(&dc,Width,Height);  k*6eZ7  
 CDC tdc; N$\5%  
 tdc.CreateCompatibleDC(&dc); Kf<_A{s  
 CBitmap*pOld=tdc.SelectObject(&bm); >@e%,z  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ;9 n8on\  
 tdc.SelectObject(pOld); r_Yl/WW  
 BITMAP btm; `a-T95IFy  
 bm.GetBitmap(&btm); 'n.9qxY;  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; $=SYssg7La  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); WY~[tBi\  
 BITMAPINFOHEADER bih; 1L qJ@v0  
 bih.biBitCount=btm.bmBitsPixel; rL/7wa  
 bih.biClrImportant=0; He;%6OG{  
 bih.biClrUsed=0; ]H'82a  
 bih.biCompression=0; *G|]5  
 bih.biHeight=btm.bmHeight; l8lR5<  
 bih.biPlanes=1; .Tqvy)'  
 bih.biSize=sizeof(BITMAPINFOHEADER); ?o'arxCxZn  
 bih.biSizeImage=size; qc"/T16M]  
 bih.biWidth=btm.bmWidth; yVv3S[J  
 bih.biXPelsPerMeter=0; !)3Su=*R  
 bih.biYPelsPerMeter=0; "$;:dfrU  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); PH &ms  
 static int filecount=0; $^ dk>Hj>4  
 CString name; / hdl  
 name.Format("pict%04d.bmp",filecount++); U .h PC3  
 name=m_Path+name; 0DT2qM[,  
 BITMAPFILEHEADER bfh; ?S:_J!vX{  
 bfh.bfReserved1=bfh.bfReserved2=0; *0ntx$M-w  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ;|,Y2?  
 bfh.bfSize=54+size; 3H %WB|  
 bfh.bfOffBits=54; IH:Cm5MV  
 CFile bf; %b4(wn?n:B  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ I;Y`rGj  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); r(CL=[  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); z{WqICnb  
  bf.WriteHuge(lpData,size); ToM*tXj  
  bf.Close(); yvwcXNXR@  
  nCount++; TBYL~QQD\C  
 } L(S.  
 GlobalFreePtr(lpData); ^P`'qfZ  
 if(nCount==1) =B%e0M  
  m_Number.Format("%d picture captured.",nCount); p}X87Zq  
 else - $/{V&?t  
  m_Number.Format("%d pictures captured.",nCount); !Shh$iz  
  UpdateData(FALSE); r26Wysi~%  
} _I5+o\;1  
xF+x I6  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) aV, J_Q6r  
{ .;6bMP[YA  
 if(pMsg -> message == WM_KEYDOWN) K%Ml2V   
 { g<3>7&^  
  if(pMsg -> wParam == VK_ESCAPE) 9DKB+K.1  
   return TRUE; >;?97'M  
  if(pMsg -> wParam == VK_RETURN) $>m<+nai'  
   return TRUE; ?,>y`Qf*|  
 }  ?C\9lLX  
 return CDialog::PreTranslateMessage(pMsg); sxa (  
} {Vu:yh\<  
t4uxon  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) }epN<DL  
{ r{&"]'/X  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ "// 8^e%Xo  
  SaveBmp(); LK~ 0ck7  
  return FALSE; `q*ABsj  
} Z] }@#/ n  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ~;Kl/Z  
 CMenu pop; IW*.B6Hw8  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 6 nhB1Aei  
 CMenu*pMenu=pop.GetSubMenu(0); 8;rS"!qM  
 pMenu->SetDefaultItem(ID_EXITICON); {4*%\?c,n  
 CPoint pt; FM];+d0  
 GetCursorPos(&pt); tgnXBWA`!  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); n_glYSV!  
 if(id==ID_EXITICON) /% 1lJD  
  DeleteIcon(); mJT m/C  
 else if(id==ID_EXIT) 8=uljn/  
  OnCancel(); Q)&Ztw<  
 return FALSE; mj~CCokF{?  
} xy>mM"DOH  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); *%sYajmD  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) sBL^NDqa2  
 AddIcon(); 8^T$6A[b  
 return res; {eV_+@dT  
} u1<kdTxA N  
[%:NR  
void CCaptureDlg::AddIcon() Pp!W$C:  
{ a}\JA`5;)Z  
 NOTIFYICONDATA data; p {3|W<  
 data.cbSize=sizeof(NOTIFYICONDATA); N%y FL  
 CString tip; en)DN3  
 tip.LoadString(IDS_ICONTIP); b L~<~gA  
 data.hIcon=GetIcon(0); eyV904<F  
 data.hWnd=GetSafeHwnd(); qsx1:Ny 1  
 strcpy(data.szTip,tip); ktRdf6:~  
 data.uCallbackMessage=IDM_SHELL;  VVY\W!  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; +a;j>hh  
 data.uID=98; i|Wn*~yFOO  
 Shell_NotifyIcon(NIM_ADD,&data); 4F?1,-X  
 ShowWindow(SW_HIDE); qZG >FC37  
 bTray=TRUE; 5Tq 3L[T5;  
} ]W,g>91m  
m\=u/Zip  
void CCaptureDlg::DeleteIcon() gE~31:a^  
{ !5-[kG&  
 NOTIFYICONDATA data; `R^VK-=C  
 data.cbSize=sizeof(NOTIFYICONDATA); =|/b[Gd(  
 data.hWnd=GetSafeHwnd(); I%`2RXBt3^  
 data.uID=98; tB.9Ov*  
 Shell_NotifyIcon(NIM_DELETE,&data); M#m7g4*L!  
 ShowWindow(SW_SHOW); #S)*MT4ke  
 SetForegroundWindow(); -d]z_ SP@  
 ShowWindow(SW_SHOWNORMAL); G$b4`wt  
 bTray=FALSE; G <q@K-  
} 3}Pa,u N  
Xs/hqIXB  
void CCaptureDlg::OnChange() Lif mYn[  
{ <[bDNe["?  
 RegisterHotkey(); I\_R& v  
} YX(%jcj*  
~S9nLb:O{  
BOOL CCaptureDlg::RegisterHotkey() x4K5  
{ FKP^f\!M  
 UpdateData(); j&9~OXYv  
 UCHAR mask=0; N INiX(  
 UCHAR key=0; *?S\0a'W@  
 if(m_bControl) #0c`"2t&M  
  mask|=4; FW4 hqgE@  
 if(m_bAlt) aum,bm/0J  
  mask|=2; <4Fd ~  
 if(m_bShift) ]F~5l?4u#  
  mask|=1; #*~Uu.T  
  key=Key_Table[m_Key.GetCurSel()]; \Ip<bbB0  
 if(bRegistered){ -h}J%UV  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); {)M4h?.2  
  bRegistered=FALSE; NKRXY~zHh  
 } 7~&Y"&  
 cMask=mask; ~Y(M>u.+!  
 cKey=key; @?U5t1O<  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); @tA.^k0`  
 return bRegistered; S^u!/ =&  
} jn[a23;G)  
iX28+weH  
  四、小结 ':=C2x1d|  
!Zrvko  
  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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