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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: 8,R]R=  
  _)|!.r&)63  
  一、实现方法 ;2iZX=P`n  
TnG"_VK9R  
  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: IV *}w"r  
p+t8*lkq  
#pragma data_seg("shareddata") {T IGPK  
HHOOK hHook =NULL; //钩子句柄 i~2>kxf;K1  
UINT nHookCount =0; //挂接的程序数目 t@Jo ?0s  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ``SjALf  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 7Ctm({I-  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey E,rPM  
static int KeyCount =0; )#Id 2b~  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 UJZa1p@L  
#pragma data_seg() h{m]n!  
t5_`q(:  
  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。 e nNn*.*|  
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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: }Yj S v^  
0L6L_;o  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR <7zpHSFBq  
cKey,UCHAR cMask) V_~wWuZ-  
{ r*g _  
 BOOL bAdded=FALSE; ;)kBJ @  
 for(int index=0;index<MAX_KEY;index++){ 2P|-V};9  
  if(hCallWnd[index]==0){ ~vXul`x  
   hCallWnd[index]=hWnd; 1eJ\CdI  
   HotKey[index]=cKey; %ry>p(-pC(  
   HotKeyMask[index]=cMask; K'tz_:d|  
   bAdded=TRUE; }O>IPRZ  
   KeyCount++; cmI8Xf]"P-  
   break; r1\.Jz  
  } wD<G+Y}  
 } o ).pF">jh  
 return bAdded; U` U/|@6  
} N\0Sq-.  
//删除热键 OS,$}I[`8  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) t _W |`  
{ 52~k:"c  
 BOOL bRemoved=FALSE; jPd<h{js  
 for(int index=0;index<MAX_KEY;index++){ pQ>V]M  
  if(hCallWnd[index]==hWnd){ UX0tI0.tg  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Vlf@T  
    hCallWnd[index]=NULL; 5 9 09O  
    HotKey[index]=0;  2AluH8X/  
    HotKeyMask[index]=0; ,s2.l/5r;C  
    bRemoved=TRUE; J]N}8 0  
    KeyCount--; qdm!]w.G5  
    break; r=k}EP&<  
   }  WsoB!m  
  } Mqpo S  
 } Nr)(&c8  
 return bRemoved; 1Zecl);O{  
} A#i-C+"}  
2H /a&uo@n  
6nwO:?1o9  
  DLL中的钩子函数如下: md_Ld /  
J@5 OZFMZ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) K%g\\uo   
{ nYe}d!  
 BOOL bProcessed=FALSE; |EApKxaKD  
 if(HC_ACTION==nCode) A~6 Cs  
 { F,W(H@ ~x  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 H^s SHj  
   switch(wParam) \uaJw\EZ  
   {  lN&GfPP6  
    case VK_MENU: ff0B*0  
     MaskBits&=~ALTBIT; Fc]#\d6  
     break; 4rx|6NV6  
    case VK_CONTROL: {L0w& ~$Fy  
     MaskBits&=~CTRLBIT; ERZ[t\g)  
     break; qvscf_%FM  
    case VK_SHIFT: :K~7BJ(HO  
     MaskBits&=~SHIFTBIT; WZMsmhU@T  
     break; c;e ,)$)-|  
    default: //judge the key and send message ?BRL;(x  
     break; u>eu47"n!  
   } ?R+$4;iy  
   for(int index=0;index<MAX_KEY;index++){ 0eLK9u3<  
    if(hCallWnd[index]==NULL) HlO+^(eX  
     continue; UOu&sg*o2B  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) aJF`rLm  
    { `MD/C Fl4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Ob+&!XTp?0  
     bProcessed=TRUE; \Q$);:=q Q  
    } vfm-K;,#  
   } HfF$>Z'kM  
  } qL#R XUTP  
  else if((lParam&0xc000ffff)==1){ //有键按下 Nt'5}  
   switch(wParam) }>w; +XU  
   { l\5 NuCgRY  
    case VK_MENU: 8ah]D  
     MaskBits|=ALTBIT; O^GXFz^  
     break; a$GKrc,z  
    case VK_CONTROL: 5Zov< +kE  
     MaskBits|=CTRLBIT; 71%u|k8|  
     break; Ef!F;De)A  
    case VK_SHIFT: c"xaN  
     MaskBits|=SHIFTBIT; pI`Ke"  
     break; ,?qS#B+>  
    default: //judge the key and send message "xOeBNRjV  
     break; VX%+!6+fS  
   } Ixw,$%-]y6  
   for(int index=0;index<MAX_KEY;index++){ ke0W?  
    if(hCallWnd[index]==NULL) D8ly8]H  
     continue; .EdV36$n  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _=MWt_A '3  
    { hD*?\bBs0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); D.!4i.)8}  
     bProcessed=TRUE; $d"+Njd  
    } V*aTDU%-.  
   } Ie~~LU  
  } EkX6> mo  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 0#JBz\  
   for(int index=0;index<MAX_KEY;index++){ R<=t{vTJ5  
    if(hCallWnd[index]==NULL) Q ZlUUj\  
     continue; 6D0,ME#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) G!\x c  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); S%oGBY*Z  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 v<wT`hiKW  
   } R32d(2%5K  
  } F0\ry "(t  
 } &u8c!;y$b  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); "DpQnhvbB  
} JF gN  
ry0 =N^  
  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: tTgW^&B  
,3j7Y5v  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); *"ShE=\p  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); bhmjH(.t  
T!PX?  
  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: msylb~^  
J^:~#`8  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) O^#u%/  
{ 5glGlD6R  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Mx"tUoU6z  
 { MF`'r#@:wa  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 yKJ^hv"#  
  SaveBmp(); YLGLr @:q  
  return FALSE; Q)>'fZ)  
 } EMG*8HRI>r  
 …… //其它处理及默认处理 ;j=1 oW  
} -+> am?  
u i1m+  
jq)|Uq'6  
  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。 bed+Ur&  
t3G'x1  
  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。 \4k*Zk  
wNZ7(W.U  
  二、编程步骤 i"xDQ$0G6  
fsd>4t:" \  
  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"; .Q@"];wH  
%Qq)=J<H ;  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Xdt+ \}\  
K }BX6dA  
  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; w C"%b#(}  
PvwIO_W  
  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; CCOg1X_  
SO/]d70HG  
  5、 添加代码,编译运行程序。 pZxL?N!  
$nn5;11@gY  
三、程序代码 D,a%Je-r,  
IJ; *N  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL =6&D4~R  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) x3 |'jmg  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ DlI5} Jh  
#if _MSC_VER > 1000 mI#; pO2  
#pragma once ]6 wi  
#endif // _MSC_VER > 1000 !`lqWO_/ :  
#ifndef __AFXWIN_H__ T*yveo &j  
#error include 'stdafx.h' before including this file for PCH sA}R!  
#endif e% 6{P  
#include "resource.h" // main symbols 9 NQq=@  
class CHookApp : public CWinApp MVZ>:G9:  
{ kqw? X{  
 public: QEa=!O  
  CHookApp(); #1@~w}Dh  
  // Overrides VKz<7K\/  
  // ClassWizard generated virtual function overrides hm>*eJNp]  
  //{{AFX_VIRTUAL(CHookApp) Wh5O{G@Ut  
 public: mNoqs&UB  
  virtual BOOL InitInstance(); ;!?K.,N:N  
  virtual int ExitInstance(); o"[bIXf-h  
  //}}AFX_VIRTUAL $:!T/*p*  
  //{{AFX_MSG(CHookApp) Hw&M2a  
  // NOTE - the ClassWizard will add and remove member functions here. Bq_P?Q+\  
  // DO NOT EDIT what you see in these blocks of generated code ! 1o>R\g3  
  //}}AFX_MSG 8[;oUVb5  
  DECLARE_MESSAGE_MAP() (B<AK4G  
}; o[hP&9>q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 79H+~1Az  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); (14kR  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); B}+9U  
BOOL InitHotkey(); uFZB8+  
BOOL UnInit(); x35s6  
#endif [dlH t;S  
.N&}<T[  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. _9|@nUD  
#include "stdafx.h" G6{A[O[  
#include "hook.h" ~79Qg{+]N  
#include <windowsx.h> ZGhoV#T@  
#ifdef _DEBUG %+ a@|Z   
#define new DEBUG_NEW mX@* 2I  
#undef THIS_FILE K-C-+RB  
static char THIS_FILE[] = __FILE__; [[h)4H{T  
#endif 9X9zIh]JV  
#define MAX_KEY 100 QYXx7h r=$  
#define CTRLBIT 0x04 'hw@l>1\9  
#define ALTBIT 0x02 5l0rw)  
#define SHIFTBIT 0x01 `e>F<{ M6@  
#pragma data_seg("shareddata") @n* D>g  
HHOOK hHook =NULL; k=2l9C3Z  
UINT nHookCount =0; Cf[F`pFM  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey jDXGm[U  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT cE5Zxcn  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ?^ezEpW  
static int KeyCount =0; `sy &dyM  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 3,I >.3  
#pragma data_seg() b.q"s6u  
HINSTANCE hins; /(ju  
void VerifyWindow(); +WN>9V0H  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) '. Hp*9R  
//{{AFX_MSG_MAP(CHookApp) h!av)nhM  
// NOTE - the ClassWizard will add and remove mapping macros here. oV>AFs6  
// DO NOT EDIT what you see in these blocks of generated code! zy6(S_j  
//}}AFX_MSG_MAP a<jE 25t  
END_MESSAGE_MAP() |#:dC #  
ZHECcPhz  
CHookApp::CHookApp() :*:fu n  
{ cN}A rv  
 // TODO: add construction code here, jI`To%^ Y  
 // Place all significant initialization in InitInstance Kx 185Q'W  
} 0nq}SH  
*M<BPxh0w]  
CHookApp theApp; Dh(T) yc  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) !riMIl1  
{ f\_!N "HW  
 BOOL bProcessed=FALSE; [j]J_S9jJ  
 if(HC_ACTION==nCode) wU)5Evp[  
 { S{i@=:  
  if((lParam&0xc0000000)==0xc0000000){// Key up bSR+yr'?  
   switch(wParam) _JJKbi  
   { _% 9+U [@  
    case VK_MENU: vs)I pV(  
     MaskBits&=~ALTBIT; ^iRwwN=d  
     break; R|J>8AL}BY  
    case VK_CONTROL: [S&O-b8A  
     MaskBits&=~CTRLBIT; fwv T2G4  
     break; "Xk%3\{P  
    case VK_SHIFT: +M O5'z  
     MaskBits&=~SHIFTBIT; J*~2 :{=%  
     break; gq_7_Y/  
    default: //judge the key and send message j /dE6d  
     break; Z F yX@#B9  
   } PT@e),{~o9  
   for(int index=0;index<MAX_KEY;index++){ ph12x: @B  
    if(hCallWnd[index]==NULL) ]n]uN~)9  
     continue; 7M#$: Fdb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) JRjMt-7H_  
    { C:GHP$/}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); wQ=yY$VP  
     bProcessed=TRUE;  ]RX tC*  
    } ,C,e/>+My  
   } '=,rb  
  } M|5]#2J_2  
  else if((lParam&0xc000ffff)==1){ //Key down JlDDM %  
   switch(wParam) >+jbMAYSq  
   { acYoOW1G  
    case VK_MENU: +V);'"L  
     MaskBits|=ALTBIT; U]!.~ji3  
     break; RJ}yf|d-C  
    case VK_CONTROL: :7Z\3_D/  
     MaskBits|=CTRLBIT; k CW!m  
     break; g3~~"`2  
    case VK_SHIFT: lc3S|4  
     MaskBits|=SHIFTBIT; 3pTS@  
     break; kV:FJx0xP  
    default: //judge the key and send message ;Ma/b=Y  
     break; 8LQ59K_WX  
   } ?F87C[o  
   for(int index=0;index<MAX_KEY;index++) Y = g>r]2  
   { $dZ>bXUw:  
    if(hCallWnd[index]==NULL) &.  =}g]  
     continue; Z"n'/S:q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) /pIb@:Y1?  
    { <qq'h  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); UC+7-y,  
     bProcessed=TRUE; VU`z|nBW@  
    } x<*IF,o  
   } aEEz4,x_  
  } `b.o&t$L  
  if(!bProcessed){ qaMZfA  
   for(int index=0;index<MAX_KEY;index++){ 2c"N-c&A  
    if(hCallWnd[index]==NULL) [Zt# c C+  
     continue; ),;D;LI{S  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) _/jUs_W  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Ku0H?qft(  
   } .kbr?N,'  
  } Q k;Kn  
 } *qO]v9 j  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); @!":(@3[  
} | z#m  
YV1a 3  
BOOL InitHotkey() gY>;|),  
{ 65waq~#  
 if(hHook!=NULL){ uP(B<NfL:'  
  nHookCount++; zr3q>]oma  
  return TRUE; cZaF f?]k  
 } @[5_C?2  
 else Mm5U`mB  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ~}$\B^z+  
  if(hHook!=NULL) q?;*g@t  
   nHookCount++; 4/HY[FT  
  return (hHook!=NULL); |6sT,/6  
} % UW=:  
BOOL UnInit() A#Q0{z@H  
{ Ox7uG{t$#  
 if(nHookCount>1){ - - i&"  
  nHookCount--; 9ra HSzK@d  
  return TRUE; qab) 1ft  
 } VBbUl|X\  
 BOOL unhooked = UnhookWindowsHookEx(hHook); %="~\1y  
 if(unhooked==TRUE){ 5Cc6 , ]  
  nHookCount=0; Dm|gSv8d,  
  hHook=NULL; g{A3W) [ b  
 } <ELziE~>V  
 return unhooked; BcZEa^^~os  
} 42Aje  
f[JI/H>  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) d s|8lz,  
{ ?jNF6z*M6  
 BOOL bAdded=FALSE; w69>tC  
 for(int index=0;index<MAX_KEY;index++){ wGOMUWAt  
  if(hCallWnd[index]==0){ FG>;P]mvp  
   hCallWnd[index]=hWnd; -GDV[Bg  
   HotKey[index]=cKey; pAJ=f}",]E  
   HotKeyMask[index]=cMask; :u >W&D  
   bAdded=TRUE; 9Eq^B9(  
   KeyCount++; m\*&2Na  
   break; ~:/%/-^  
  }  ``(}4 a  
 } [^?13xMb  
 return bAdded; UOR _M5  
} !y>lOw})Q  
yfSiByU  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) DC$7B`#D  
{ <S\;k@f  
 BOOL bRemoved=FALSE; wUru1_zjO  
 for(int index=0;index<MAX_KEY;index++){ Ud>`@2  
  if(hCallWnd[index]==hWnd){ !sg%6H?}  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ HCX!P4Hj  
    hCallWnd[index]=NULL; j}|N^A_ S  
    HotKey[index]=0; `"xk,fVYd  
    HotKeyMask[index]=0; \3t,|%v  
    bRemoved=TRUE; :kWZSN8.D  
    KeyCount--; Wk/fB0  
    break; Jj=yG"$!  
   } V~'k1P4  
  } Y)'!'J  
 } b(q$j/~ zb  
 return bRemoved; b:fxkQm  
} n!UMU^  
F1 <489  
void VerifyWindow() #2Ac  
{ H/^ ~<U#p  
 for(int i=0;i<MAX_KEY;i++){ _, \y2&KT  
  if(hCallWnd!=NULL){ (g%JK3  
   if(!IsWindow(hCallWnd)){ 5*JV )[  
    hCallWnd=NULL; {[Uti^)m%  
    HotKey=0; %:" RzHN  
    HotKeyMask=0; Jq# [uX  
    KeyCount--; Rz`@N`U  
   } 'is,^q:@  
  } J*}VV9H  
 } /lf\ E=  
} "%:7j!#X|I  
E=;BI">.  
BOOL CHookApp::InitInstance() Xy[}Gp  
{ Z -pyFK\  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); kj x>  
 hins=AfxGetInstanceHandle(); =RQ )$ %  
 InitHotkey(); IM[54_I  
 return CWinApp::InitInstance(); i Bi7|  
} {udrT"h  
OfD@\;L  
int CHookApp::ExitInstance() NOF?LV  
{ @b]VCv0*f%  
 VerifyWindow(); C@ FxB[  
 UnInit(); x HY+q ;  
 return CWinApp::ExitInstance(); M{*kB2jr  
} &@=u+)^-{  
`ajx hp  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file h^['rmd  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) jVX._bEGX  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ s0gJ f[  
#if _MSC_VER > 1000 <Cu'!h_nL  
#pragma once ;JAK[o8i  
#endif // _MSC_VER > 1000 i B%XBR  
dj3|f{kg{  
class CCaptureDlg : public CDialog &K06}[J  
{ +*n] tlk  
 // Construction USE   
 public: ah 4kA LO  
  BOOL bTray; P\.WXe#j  
  BOOL bRegistered; .H Fc9^.*  
  BOOL RegisterHotkey(); c L?\^K)  
  UCHAR cKey; D._{E*vg  
  UCHAR cMask; U%Dit  
  void DeleteIcon(); Dz,uS nnm  
  void AddIcon(); \^yXc*C  
  UINT nCount; w-J"zC  
  void SaveBmp(); <H<!ht%q3  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor \.5F](:  
  // Dialog Data :]EP@.(  
  //{{AFX_DATA(CCaptureDlg) =\M)6"}y}  
  enum { IDD = IDD_CAPTURE_DIALOG }; }bZ 8-v  
  CComboBox m_Key; {":c@I  
  BOOL m_bControl; +IvNyj|  
  BOOL m_bAlt; 6@&fvf  
  BOOL m_bShift; 6e*%\2UA  
  CString m_Path; jh>N_cp  
  CString m_Number; 37#cx)p^f  
  //}}AFX_DATA F@g17aa  
  // ClassWizard generated virtual function overrides 7kdeYr~<1  
  //{{AFX_VIRTUAL(CCaptureDlg) hl`u"?rg  
 public: a-fv[oB  
  virtual BOOL PreTranslateMessage(MSG* pMsg); xne]Q(B>  
 protected: >Q&CgGpW$  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Dq|GQdZ>o  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ya#RII']  
  //}}AFX_VIRTUAL iA]DE`S  
  // Implementation n4Vwao/9x  
 protected:  64SW  
  HICON m_hIcon; H4W1\u  
  // Generated message map functions [U swf3  
  //{{AFX_MSG(CCaptureDlg) aUA cR W  
  virtual BOOL OnInitDialog(); |0lLl^zp  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); kPWBDpzN  
  afx_msg void OnPaint(); :RHm*vt  
  afx_msg HCURSOR OnQueryDragIcon(); p*Xix%#6  
  virtual void OnCancel(); K6-6{vt  
  afx_msg void OnAbout(); 5Wo5 n7o  
  afx_msg void OnBrowse(); (/-lV&eR  
  afx_msg void OnChange(); v3 -5"q!Sq  
 //}}AFX_MSG &i)helXs]  
 DECLARE_MESSAGE_MAP() -=5EbNPwG  
}; TM)u?t+[  
#endif X2LV&oi  
>$Fp}?xX  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file N=q#y@L  
#include "stdafx.h" <o2,HTWNPS  
#include "Capture.h" ti}f&w ICJ  
#include "CaptureDlg.h" Zgy7!AF!  
#include <windowsx.h> XJc ,uj7  
#pragma comment(lib,"hook.lib") C1 tb`  
#ifdef _DEBUG 0fA=_=A,  
#define new DEBUG_NEW 0Yp>+:#  
#undef THIS_FILE KyjyjfIwH  
static char THIS_FILE[] = __FILE__; a%v>eXc  
#endif >[EBpYi  
#define IDM_SHELL WM_USER+1 >G&^?5  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ;ed#+$Na  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); w;~>k%}j  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; r|<6Aae&  
class CAboutDlg : public CDialog r5[4h'f  
{ 6s5yyy=L%~  
 public: +^Fp&K+^  
  CAboutDlg(); X PA 0m  
  // Dialog Data Z/gsCYS3F  
  //{{AFX_DATA(CAboutDlg) -;vT<G3  
  enum { IDD = IDD_ABOUTBOX }; ) y`i@S}J  
  //}}AFX_DATA x7H A722w  
  // ClassWizard generated virtual function overrides ]W;:|/,c  
  //{{AFX_VIRTUAL(CAboutDlg) zz&vfO31J  
 protected: p3 e|j  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support %Uf'+!4l`  
  //}}AFX_VIRTUAL _H8*ReFG  
  // Implementation Zb"jB$58  
 protected: Xo\S9,s{  
  //{{AFX_MSG(CAboutDlg) $2QYxY9s  
  //}}AFX_MSG cW; H!:&  
  DECLARE_MESSAGE_MAP() 9)Ly}Kzx  
}; R#ya,L  
YtpRy% R  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 2[ksi51y  
{ NZ+7p{&AN  
 //{{AFX_DATA_INIT(CAboutDlg) sDX/zF6t  
 //}}AFX_DATA_INIT =HS4I.@c_5  
} [ZD[a6(94  
hXc}r6<B  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) AX;c}0g  
{ '$?du~L-  
 CDialog::DoDataExchange(pDX); 'AWp6L@  
 //{{AFX_DATA_MAP(CAboutDlg) F5U|9<  
 //}}AFX_DATA_MAP sBU_Ft  
} N}DL(-SQ3  
' Rc#^U*n  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Z%OW5]q  
 //{{AFX_MSG_MAP(CAboutDlg) b)`pZiQP  
 // No message handlers >Mw'eQ0(y  
 //}}AFX_MSG_MAP }vY.EEy!  
END_MESSAGE_MAP() gHZqA_*T8U  
AuXs B  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) s&VOwU  
: CDialog(CCaptureDlg::IDD, pParent) T pD;  
{ U <rI!!#9  
 //{{AFX_DATA_INIT(CCaptureDlg) Pj&A=  
  m_bControl = FALSE; r**f,PDZ  
  m_bAlt = FALSE; Bzw19S6y  
  m_bShift = FALSE; {[P!$ /  
  m_Path = _T("c:\\"); M*(H)i;s:w  
  m_Number = _T("0 picture captured."); GyK(Vb"h6  
  nCount=0; q/x/N5HU  
  bRegistered=FALSE; ~)?|J  
  bTray=FALSE; nmg{%P  
 //}}AFX_DATA_INIT c]NN'9G!{  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 #)]E8=}  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); j8a[ (  
} g YUTt  
7 >bMzdH  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) $w/E9EJ)3A  
{ mX;H((  
 CDialog::DoDataExchange(pDX); Cfv]VQQE  
 //{{AFX_DATA_MAP(CCaptureDlg) p/&HUQQk  
  DDX_Control(pDX, IDC_KEY, m_Key); P0 b4Hq3  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ({ k7#1 h8  
  DDX_Check(pDX, IDC_ALT, m_bAlt); jkt 6/H  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); (A4&k{C_  
  DDX_Text(pDX, IDC_PATH, m_Path); e2wvc/gG6  
  DDX_Text(pDX, IDC_NUMBER, m_Number); F&az":  
 //}}AFX_DATA_MAP H %z/v|e6  
} PJK9704 6  
*HeVACxo  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 9go))&`PJL  
//{{AFX_MSG_MAP(CCaptureDlg) T?rH ,$:  
 ON_WM_SYSCOMMAND() > c:Zx!  
 ON_WM_PAINT() #c:kCZt#  
 ON_WM_QUERYDRAGICON() E-SG8U;  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) `tVy_/3(9  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ,v7Q*3  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 9.s,:?5e  
//}}AFX_MSG_MAP l9J*um-  
END_MESSAGE_MAP() #U"1 9@|}  
NzlAC  
BOOL CCaptureDlg::OnInitDialog() Ao"C<.gUYP  
{ 2y%R:Mu  
 CDialog::OnInitDialog(); BIj   
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); c\K<sM{  
 ASSERT(IDM_ABOUTBOX < 0xF000); #xp(B5  
 CMenu* pSysMenu = GetSystemMenu(FALSE); m9t$h  
 if (pSysMenu != NULL) g "*;nHI D  
 { H=<LutnZ  
  CString strAboutMenu; F#|Z# Mu  
  strAboutMenu.LoadString(IDS_ABOUTBOX); D/:3R ZF  
  if (!strAboutMenu.IsEmpty()) EO:avH.*0  
  { JC2*$qu J  
   pSysMenu->AppendMenu(MF_SEPARATOR); gDC2 >nV  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); [K:29N9~4  
  } vyU!+mlc  
 } W.[BPR  
 SetIcon(m_hIcon, TRUE); // Set big icon ArXl=s';s4  
 SetIcon(m_hIcon, FALSE); // Set small icon ti2  
 m_Key.SetCurSel(0); V.VJcx  
 RegisterHotkey(); !*vBW/  
 CMenu* pMenu=GetSystemMenu(FALSE); vD26;S.y[a  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); X"<|Z]w  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); {[^#h|U  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Ep ">v>"  
 return TRUE; // return TRUE unless you set the focus to a control bV6V02RF  
} 2 Y+:,ud\  
ri=+(NKo-  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) >rf5)Y~f  
{ GFL-.? 0  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) %l|\of7P2}  
 { |';7v)CIG  
  CAboutDlg dlgAbout; ,LUTHWEo"I  
  dlgAbout.DoModal(); k|B2@{  
 } -oh7d$~  
 else 8xTix1u0  
 { vYnftJK&  
  CDialog::OnSysCommand(nID, lParam); V^rW?Do  
 } 8zmv 5trt  
} (U9a@ 1  
s|2}2<+  
void CCaptureDlg::OnPaint() PGX+p+wB  
{ 0>@[o8  
 if (IsIconic()) $ $4W}Ug3U  
 { fM ^<+o@  
  CPaintDC dc(this); // device context for painting '5rU e\k  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 9o_- =>(  
  // Center icon in client rectangle yL&/m~{s  
  int cxIcon = GetSystemMetrics(SM_CXICON); ] .5O X84  
  int cyIcon = GetSystemMetrics(SM_CYICON); %?=)!;[  
  CRect rect; hQ';{5IKvC  
  GetClientRect(&rect); $E.XOpl&I  
  int x = (rect.Width() - cxIcon + 1) / 2;  SFpQ#  
  int y = (rect.Height() - cyIcon + 1) / 2; ~:Mm<*lL%  
  // Draw the icon }N,>A-P  
  dc.DrawIcon(x, y, m_hIcon); ],&\%jd<  
 } ])N%^Qe$U  
 else % wL,v.}  
 { . #U}q 7X  
  CDialog::OnPaint(); 0p3vE,pF  
 } MZ~.(&  
} M[s\E4l:t  
d+5:Qrr  
HCURSOR CCaptureDlg::OnQueryDragIcon() Kz[BB@[  
{ #{,h@g}W  
 return (HCURSOR) m_hIcon; KY+]RxX  
} o0`q#>7!_b  
j04/[V)  
void CCaptureDlg::OnCancel() x+:zq<0|  
{ Kv?;cu!  
 if(bTray) @a(oB.i  
  DeleteIcon(); 784;]wdy\  
  CDialog::OnCancel(); RGp'b  
} 2 ~-( A  
ikHOqJ-,m  
void CCaptureDlg::OnAbout() p(?3 V  
{ ps+:</;Z  
 CAboutDlg dlg; )4uq iA6  
 dlg.DoModal(); 9L  HuS  
} -3vh!JMN  
968^ "T#  
void CCaptureDlg::OnBrowse() Eem g  
{ $?f]ZyZr.  
 CString str; ";dU-\3M  
 BROWSEINFO bi; e /94y6*>  
 char name[MAX_PATH]; [z+x"9l0!  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); `qu] Pxk  
 bi.hwndOwner=GetSafeHwnd(); CQ>]jQ,2  
 bi.pszDisplayName=name; 4B$bj `h  
 bi.lpszTitle="Select folder"; WG%2<Q^  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ,q</@}.\wN  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); n7DLJ`ho{  
 if(idl==NULL) 2AK}D%jfc  
  return; #r}uin*jD  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); =v 0~[ E4  
 str.ReleaseBuffer(); xb`CdtG2.  
 m_Path=str; or.\)(m#(  
 if(str.GetAt(str.GetLength()-1)!='\\') "L@g3g?|`  
  m_Path+="\\"; kM`7EPk  
 UpdateData(FALSE); CQ18%w6  
} Ja [#[BJ?  
cL7C 2wB`  
void CCaptureDlg::SaveBmp() gjZx8oIoP  
{ !*bdG(pK  
 CDC dc; oHsP?%U  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); OjATSmZ@@  
 CBitmap bm; o?\Gm  
 int Width=GetSystemMetrics(SM_CXSCREEN); :mp$\=  
 int Height=GetSystemMetrics(SM_CYSCREEN); #(dhBEXPW;  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Tf[dZ(+\  
 CDC tdc; f{_)rsqf  
 tdc.CreateCompatibleDC(&dc); WZK :.y  
 CBitmap*pOld=tdc.SelectObject(&bm); }`]]b+_b>@  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); #Fzb8Yo  
 tdc.SelectObject(pOld); mz-N{>k  
 BITMAP btm; "tX7%(  
 bm.GetBitmap(&btm); h2;l1 G,  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ~`[8"YUL  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); vJThU$s-  
 BITMAPINFOHEADER bih; ?*+1~m>  
 bih.biBitCount=btm.bmBitsPixel; 3#mE( `|P  
 bih.biClrImportant=0; [gn[nP9  
 bih.biClrUsed=0; vHc#m@4o  
 bih.biCompression=0; {u4i*udG`)  
 bih.biHeight=btm.bmHeight; `^%@b SE(  
 bih.biPlanes=1; y@ .b 4  
 bih.biSize=sizeof(BITMAPINFOHEADER); d?}hCo=/Xq  
 bih.biSizeImage=size; 3):?ZCw7y  
 bih.biWidth=btm.bmWidth; Hz?,#>{  
 bih.biXPelsPerMeter=0; u\3ZIb  
 bih.biYPelsPerMeter=0; .hne)K%={y  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Gh iHA9.  
 static int filecount=0; ~'{VaYk]v  
 CString name; M:(&n@e  
 name.Format("pict%04d.bmp",filecount++); #[(gIOrNn8  
 name=m_Path+name; @ExLh9  
 BITMAPFILEHEADER bfh; _.-#E$6s#q  
 bfh.bfReserved1=bfh.bfReserved2=0; C *Xik9n  
 bfh.bfType=((WORD)('M'<< 8)|'B'); i'iO H|s  
 bfh.bfSize=54+size; t%HI1eO7h  
 bfh.bfOffBits=54; C[0MA ,^  
 CFile bf; mF~ys{"t  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ pU@YiwP"]x  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Iu%^*K%  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ``6{T1fQS  
  bf.WriteHuge(lpData,size); pJocI_v9  
  bf.Close(); A$ J9U3+O  
  nCount++; I}_;A<U  
 } Lz?*B$h  
 GlobalFreePtr(lpData); []=_<]{  
 if(nCount==1) l-cW;b~  
  m_Number.Format("%d picture captured.",nCount); yIWc\wv  
 else y,V6h*x2  
  m_Number.Format("%d pictures captured.",nCount); 9u?Eb~#$  
  UpdateData(FALSE); 3?  };  
} ETxp# PZ  
re/xs~  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) /Bh>  
{ HS(U4   
 if(pMsg -> message == WM_KEYDOWN) F:S"gRKz  
 { ^?nP$+gq  
  if(pMsg -> wParam == VK_ESCAPE) !*5_pGe  
   return TRUE; %6N)G!P  
  if(pMsg -> wParam == VK_RETURN) S7Znz@  
   return TRUE; blUY.{NN3  
 } l\_x(BH  
 return CDialog::PreTranslateMessage(pMsg); :q(D(mK  
} Ca X^)  
'V1!&Q6  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) &jt02+Hj'  
{ x ~wNO/  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 3`x sK[  
  SaveBmp(); jmSt?M0.xV  
  return FALSE; z+ uL "PG[  
} '!AT  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Etw~*  
 CMenu pop; & \JLTw  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 4`$5 _} j!  
 CMenu*pMenu=pop.GetSubMenu(0); O/(3 87=U  
 pMenu->SetDefaultItem(ID_EXITICON); Shs')Zs bv  
 CPoint pt; \zBd<H4S:  
 GetCursorPos(&pt); ftxTX3X  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); z}iSq$  
 if(id==ID_EXITICON) )dqR<)  
  DeleteIcon(); 7:z>+AM[r  
 else if(id==ID_EXIT) ' 4,y  
  OnCancel(); hN[X 1*  
 return FALSE; d3og?{i<}&  
} Gl.?U;4Z  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ]9#CVv[rq  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 1]Gf)|  
 AddIcon(); 7,f:Qi@g  
 return res; h,]tQ#!s8  
} z/)$D  
]F !'M  
void CCaptureDlg::AddIcon() )ni"qv~J  
{ u IAZo;  
 NOTIFYICONDATA data; -!@H["  
 data.cbSize=sizeof(NOTIFYICONDATA); jiqi!*  
 CString tip; 0h^uOA; c  
 tip.LoadString(IDS_ICONTIP); XMomFW_@  
 data.hIcon=GetIcon(0); KuIkul9^%  
 data.hWnd=GetSafeHwnd(); d8 rBu jT  
 strcpy(data.szTip,tip); GI}4,!^N  
 data.uCallbackMessage=IDM_SHELL; SwyaYK  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; nT_*EC<.  
 data.uID=98; F ~*zC`>Y  
 Shell_NotifyIcon(NIM_ADD,&data); p@vpd  
 ShowWindow(SW_HIDE); " 98/HzR  
 bTray=TRUE; K1/ U (A  
} %B[YtWqm`/  
:wFb5"  
void CCaptureDlg::DeleteIcon() fdN45in=>  
{ TFNUv<>X  
 NOTIFYICONDATA data; j[_t6Z  
 data.cbSize=sizeof(NOTIFYICONDATA); )uANmThOz  
 data.hWnd=GetSafeHwnd(); _L8Mpx*E  
 data.uID=98; C(f$!~M4b  
 Shell_NotifyIcon(NIM_DELETE,&data); _c[|@D  
 ShowWindow(SW_SHOW); 3xRM 1GgO  
 SetForegroundWindow(); mp!YNI  
 ShowWindow(SW_SHOWNORMAL); 3Wjq>\  
 bTray=FALSE; km9Gwg/zT  
} 5BrU'NF  
nWKO8C>  
void CCaptureDlg::OnChange() "(Mvl1^BT  
{ >s;oOo+5  
 RegisterHotkey(); EV:_Kx8fP  
} Vp|2wlFE-  
k&WUv0  
BOOL CCaptureDlg::RegisterHotkey() JtSuD>H`"  
{ r;c' NqP  
 UpdateData(); W^^K0yn`@  
 UCHAR mask=0; DxE(9j  
 UCHAR key=0; ,?C|.5  
 if(m_bControl) &/ \O2Aw8  
  mask|=4; CR%D\I$o  
 if(m_bAlt) c$@`P  
  mask|=2; d,zp `S  
 if(m_bShift) VEL:JsY  
  mask|=1; FX{ ~"  
  key=Key_Table[m_Key.GetCurSel()]; g7 .7E6%H  
 if(bRegistered){ =n> iQS  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); gmXy>{T  
  bRegistered=FALSE; uCY(:;[<  
 }  -0{T  
 cMask=mask; 7bctx_W&6  
 cKey=key; !y.ei1diw  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 0eQ~#~j&  
 return bRegistered; 3 %z   
} 29&sydu  
]ev*m&O  
  四、小结 *!._Ais,\  
$Sp*)A]E`  
  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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