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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: [OT@gp:  
  T"0a&.TLj  
  一、实现方法 9!R!H&  
f{+8]VA  
  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: $Qm;F% >  
 10DS  
#pragma data_seg("shareddata") t,H,*2  
HHOOK hHook =NULL; //钩子句柄 )8vcg{b{d  
UINT nHookCount =0; //挂接的程序数目 s_kI\w4(x1  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 3O]e  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 6znm?s@~  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey bc 0|tJc  
static int KeyCount =0; P@Qo2zTh%  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 &B3kzs  
#pragma data_seg() .f6_[cS;g  
SGbo|Xe7:  
  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。 6\]-J*e>  
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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: Gis'IX(  
;ndg,05_  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 6?t5g4q*nn  
cKey,UCHAR cMask) E+Gea[c  
{ e;gf??8}  
 BOOL bAdded=FALSE; P(Lwpa,S  
 for(int index=0;index<MAX_KEY;index++){ {jv1hKTa  
  if(hCallWnd[index]==0){ S#""((U$  
   hCallWnd[index]=hWnd; CsE|pXVG  
   HotKey[index]=cKey; hMDyE.X-  
   HotKeyMask[index]=cMask; D_8hn3FH  
   bAdded=TRUE; Jv7M[SJ#x  
   KeyCount++; 9 np<r82  
   break; W]R5\ G*  
  } gG $o8c-  
 } 8m 9G^s`[  
 return bAdded; 'fgDe  
} 0m@S+$v  
//删除热键 !X,S2-}"  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) .a^/r'?  
{ -Pvt+I>  
 BOOL bRemoved=FALSE; {=(4  
 for(int index=0;index<MAX_KEY;index++){ A,iXiDb3pK  
  if(hCallWnd[index]==hWnd){ qItI):9U  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ %tu{`PN<  
    hCallWnd[index]=NULL; w%$n)7<*  
    HotKey[index]=0; %ZxKN;  
    HotKeyMask[index]=0; pjoI};  
    bRemoved=TRUE; )zt5`"/o  
    KeyCount--; _\1(7?0D  
    break; +6>Pp[%  
   } 1E-$f  
  } |W::\yu6  
 } 2L\h+)  
 return bRemoved; Oc8+an1m  
} ?W|POk}  
pu^1s#g8w  
-ss2X  
  DLL中的钩子函数如下: Wd%j;glG  
4@VX%5uy  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) kz??""G7/  
{ bb<Vh2b>R  
 BOOL bProcessed=FALSE; T<ua0;7  
 if(HC_ACTION==nCode) ;Joo!CXHO  
 { .K0BK)axO  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Z uE 0'9  
   switch(wParam) .3Ap+V8?  
   {  kBT cN D|  
    case VK_MENU: j9qN!.~mM  
     MaskBits&=~ALTBIT; :_^YEm+A  
     break; 9 V;m;sz  
    case VK_CONTROL: -Wig k['v  
     MaskBits&=~CTRLBIT; >B9rr0d0  
     break; XrvrN^'  
    case VK_SHIFT: ?K]k(ZV_+Y  
     MaskBits&=~SHIFTBIT; xNONf4I:6J  
     break; .5T7O_%FP  
    default: //judge the key and send message X(1.Hjh  
     break; ?^7~|?v  
   } WRnUF[y+)  
   for(int index=0;index<MAX_KEY;index++){ BE U[M  
    if(hCallWnd[index]==NULL) 1"k +K~:  
     continue; w8on3f;6n#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) UC0 yrV  
    { #2dmki"~(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ~q9RZ#g13J  
     bProcessed=TRUE; 4gZN~_AI<  
    } DQRt\!  
   } 'R$~U?i8  
  } 0q3 :"X  
  else if((lParam&0xc000ffff)==1){ //有键按下 <9Chkb|B  
   switch(wParam)  Ne4A  
   { qzG'Gz{{qu  
    case VK_MENU: :')<|(Zy  
     MaskBits|=ALTBIT; D?E5p.!A  
     break; %1lLUgf3G/  
    case VK_CONTROL: S }|ea2  
     MaskBits|=CTRLBIT; a( qw  
     break; 3)7'dM  
    case VK_SHIFT: 1n,JynJ  
     MaskBits|=SHIFTBIT; 6-^+btl)#  
     break; Oll\T GXP!  
    default: //judge the key and send message VOiphw`  
     break; /q^( uWu  
   } E6US  
   for(int index=0;index<MAX_KEY;index++){ t2E_y6  
    if(hCallWnd[index]==NULL) c]O4l2nCL  
     continue; $@<\$I2s  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) U-Iwda8v  
    { J|>P,x#G  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); iGp@P=;m  
     bProcessed=TRUE; FkS{Z s  
    } B^OhL!*tI  
   } fGxa~Unx  
  } t]m#k%)  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 \0:l9;^4  
   for(int index=0;index<MAX_KEY;index++){ F |GWYw'%  
    if(hCallWnd[index]==NULL) `aUA_"f  
     continue; @B[V'|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 59)PJ0E  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); g,1\Gj%y  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 _7;#0B  
   } 2vur _`c V  
  } oi!E v_h  
 } 1]qhQd-u  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ;^xku%u  
} j jwY{jV  
5H5< ft,  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: dW=]|t&  
AvwX 2?tc  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); T|=8 jt,  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); E;X'.7[c  
1\3n   
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 7+z%O3k'I  
+F@9AO>LF  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ?$gEX@5h  
{ Coyop#q#"{  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ZA# jw 8F  
 { 4[(P>`Unx  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Vw,dHIe(3  
  SaveBmp(); cL}g7D  
  return FALSE; )QKZI))G0  
 } Y/4B*>kl  
 …… //其它处理及默认处理 3}sd%vCK  
} 1p tPey  
7y60-6r  
y)=Xo7j  
  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。 D,R/abYZH  
){,8}(|  
  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。 0>AA-~=-  
eHv/3"Og  
  二、编程步骤 ^y?? pp<1J  
5ecqJ  
  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"; uh GL1{  
k muF*0Bjk  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; g.veHh|;_  
w+JDu_9+A]  
  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; {? 6]_J  
K}* s^*X  
  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; FkRrW^?5G  
Z*oGVr g  
  5、 添加代码,编译运行程序。 tewC *%3V  
e}Db-7B_~  
三、程序代码 :*\JJ w  
H_jMl$f)j  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL p{88v3b6  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) y0z}[hZ  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ C^ uXJ~8  
#if _MSC_VER > 1000 f):|Ad|  
#pragma once VkUMMq{  
#endif // _MSC_VER > 1000 mH;\z;lyK  
#ifndef __AFXWIN_H__ oo /#]a  
#error include 'stdafx.h' before including this file for PCH T[c ;},  
#endif }PoB`H'K5  
#include "resource.h" // main symbols 9V\5`QXu  
class CHookApp : public CWinApp ['{mW4i  
{ oo<,hOv   
 public: LB-4/G$  
  CHookApp(); XC~|{d  
  // Overrides l].dOso$`  
  // ClassWizard generated virtual function overrides c!j$ -Ovm  
  //{{AFX_VIRTUAL(CHookApp) rBT#Cyl  
 public: rZ *}jD[  
  virtual BOOL InitInstance(); Z?dz@d%C  
  virtual int ExitInstance(); Kc0KCBd8];  
  //}}AFX_VIRTUAL *Z<`TB)<X  
  //{{AFX_MSG(CHookApp) pYH#Vh  
  // NOTE - the ClassWizard will add and remove member functions here. s_u@8e 6_  
  // DO NOT EDIT what you see in these blocks of generated code ! va| 1N/&  
  //}}AFX_MSG LG@5Z-  
  DECLARE_MESSAGE_MAP() L%Me wU0TZ  
}; oS, %L  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); lor jMS  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); >DPC}@Wl  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 6"z:s-V  
BOOL InitHotkey(); YG$Y4h" @"  
BOOL UnInit(); jq%Qc9y  
#endif #T&''a  
/0@'8f\I  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 0]fzjiaGt  
#include "stdafx.h" 3+0 $=ef  
#include "hook.h" ~CQsv `  
#include <windowsx.h> /n&w|b%  
#ifdef _DEBUG G D$o |l]\  
#define new DEBUG_NEW A+_361KH  
#undef THIS_FILE  GMrjZ  
static char THIS_FILE[] = __FILE__; B&VruOP0  
#endif Jzo|$W  
#define MAX_KEY 100 (~#{{Ja  
#define CTRLBIT 0x04 t[Qf|#g  
#define ALTBIT 0x02 B!4chxzUZ  
#define SHIFTBIT 0x01 UBLr|e>dQE  
#pragma data_seg("shareddata") w9G (^jS6  
HHOOK hHook =NULL; Rq|7$O5  
UINT nHookCount =0; TY"8.vd  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey iP)`yB5`  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Y({&} \o  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey W9+H /T7!  
static int KeyCount =0; I r]#u]Ap  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift OWx-I\:  
#pragma data_seg() ;p)RMRMg  
HINSTANCE hins; 3MH9%*w'0  
void VerifyWindow(); g Y|f[M|  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) \!x~FVA  
//{{AFX_MSG_MAP(CHookApp) oSq?. *w<  
// NOTE - the ClassWizard will add and remove mapping macros here. ark~#<SqAr  
// DO NOT EDIT what you see in these blocks of generated code! #rD0`[pz  
//}}AFX_MSG_MAP &e0BL z  
END_MESSAGE_MAP() m&a.i B  
W US[hx,  
CHookApp::CHookApp()  qr~P$  
{ Jz<-B  
 // TODO: add construction code here, 98'/yZ  
 // Place all significant initialization in InitInstance 0%&ZR=y(G  
} B]iPixA6  
{<+B>6^  
CHookApp theApp; 0n<>X&X  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 7@oM?r7td  
{ >"5 f B  
 BOOL bProcessed=FALSE; W|'7)ph  
 if(HC_ACTION==nCode) Ve)P/Zz}^  
 { GJS3O;2*  
  if((lParam&0xc0000000)==0xc0000000){// Key up D~P3~^  
   switch(wParam) 3Xcjr2]~  
   { 1cq"H/N  
    case VK_MENU: `1 A,sXfa  
     MaskBits&=~ALTBIT; Gj!9#on$7R  
     break; C.4r`F$p  
    case VK_CONTROL: rZ'&'#Q  
     MaskBits&=~CTRLBIT; F#-mseKhc  
     break; ",O |uL  
    case VK_SHIFT:  Z(F['Zf  
     MaskBits&=~SHIFTBIT; [ ICFPY6  
     break; xP/?E  
    default: //judge the key and send message VW&EdrR,S  
     break; )cP &c=  
   } J PO'1 D)  
   for(int index=0;index<MAX_KEY;index++){ .Q!_.LX  
    if(hCallWnd[index]==NULL) M$YU_RPl+  
     continue; Zaime  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,=>Ws:j  
    { B! +rO~  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ad)jw:n  
     bProcessed=TRUE; )SU\s+"M  
    } hQ7-m.UZw  
   } fVJlA  
  } 4|U$ON?x  
  else if((lParam&0xc000ffff)==1){ //Key down ! [3  /!  
   switch(wParam)  R.x^  
   { = y @*vl   
    case VK_MENU: RG&t0%yj}  
     MaskBits|=ALTBIT; G.")Bg  
     break; |#(KP  
    case VK_CONTROL:  A:b(@'h  
     MaskBits|=CTRLBIT; w :nYsuF  
     break; 5}C.^J`  
    case VK_SHIFT: qTZ\;[CrP"  
     MaskBits|=SHIFTBIT; amTeT o]Tg  
     break; A4uKE"WE  
    default: //judge the key and send message j)nL!":O  
     break; #B2a?   
   } `uP:UQ9S  
   for(int index=0;index<MAX_KEY;index++) /Fk]>|*  
   { _"%hcCMw  
    if(hCallWnd[index]==NULL) |E?PQ?P  
     continue; ]J1oY]2~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |l CS^bA3  
    { 5bB\i79$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); &x9>8~   
     bProcessed=TRUE; fV#,<JG  
    } DHq#beN  
   } @>fsg-|  
  } %1oB!+tv  
  if(!bProcessed){ u4#YZOiY)A  
   for(int index=0;index<MAX_KEY;index++){ hv0bs8h  
    if(hCallWnd[index]==NULL) oyT`AYa  
     continue; dy>5LzqK3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) K/iFB  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); : E`78  
   } n!-]f.=P  
  } Q&#Arph0e  
 } % }IrZrh  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); <Hf3AB;#4  
} ;FGS(.mjlC  
c>Tf@A og>  
BOOL InitHotkey() UY6aD~tD0  
{ DaS~bweMw  
 if(hHook!=NULL){ f\;w(_  
  nHookCount++; Z=9<esx  
  return TRUE; 2$OV`qy@?  
 } wrQ0 2?  
 else 1oc@]0n  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); g#k@R'7E  
  if(hHook!=NULL) \ 5.nr*5  
   nHookCount++; )n6,uTlOw  
  return (hHook!=NULL); h2-v.Tjf  
} }_Ci3|G>%D  
BOOL UnInit() 7qSnP 30}  
{ Sse%~:FL  
 if(nHookCount>1){ 7@&mGUALO  
  nHookCount--; 9^u}~e #(  
  return TRUE; E~@&&d U8  
 } enx+,[  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ?y-@c]  
 if(unhooked==TRUE){ F EUfskv  
  nHookCount=0; 4bCA"QM[[  
  hHook=NULL; p/yz`m T'w  
 } w@"Zjbs`  
 return unhooked; 3$?nzKTW\  
} s3Wjhw/  
j0=F__H#@  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 9u)p9)^-.v  
{ o~<jayqU  
 BOOL bAdded=FALSE; D<hX%VJ%M  
 for(int index=0;index<MAX_KEY;index++){ TMGYNb%<bX  
  if(hCallWnd[index]==0){ ihJ!]#Fbm  
   hCallWnd[index]=hWnd; \gu8 ~zK  
   HotKey[index]=cKey; 2n+ud ?|l  
   HotKeyMask[index]=cMask; w\mTug  
   bAdded=TRUE; mGDy3R90  
   KeyCount++; E-%$1=;  
   break; R$ !]z(  
  } [+d~He  
 } 4{Q$^wD+.  
 return bAdded; W__Y^\ ~  
} ?0'e_s  
*LMzq9n3o  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) =0L%<@yA  
{ k`#E#1niN  
 BOOL bRemoved=FALSE; |$;4/cKfy  
 for(int index=0;index<MAX_KEY;index++){ w/ ^_w5  
  if(hCallWnd[index]==hWnd){ b*W,8HF4,  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 7;c^*"Ud  
    hCallWnd[index]=NULL; >z~_s6#CP  
    HotKey[index]=0; `ZZ3!$czR  
    HotKeyMask[index]=0; ,SPgop'  
    bRemoved=TRUE; }3, 4B -8!  
    KeyCount--; S\]9mHJI  
    break; .820~b0  
   } tU$n3Bg  
  } ;HBKOe_3  
 } =jKu=!QPq  
 return bRemoved; W\($LD"X  
} Yecdw'BW?  
{sxdDl  
void VerifyWindow() )3A+Ell`  
{ eIy:5/s  
 for(int i=0;i<MAX_KEY;i++){ C?k\5AzT  
  if(hCallWnd!=NULL){ amq,^  
   if(!IsWindow(hCallWnd)){ <& 3[|Ca  
    hCallWnd=NULL; [ #ih o(/  
    HotKey=0; ,cxe"U  
    HotKeyMask=0; giH#t< )W  
    KeyCount--; Zn0a)VH%  
   } KWeE!f 7G  
  } GGo ~39G  
 } G)^/#d#&  
} skXzck  
j D*<M/4  
BOOL CHookApp::InitInstance() /NjBC[P  
{ auB 931|  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ps?su`  
 hins=AfxGetInstanceHandle(); *3P+K:2lNG  
 InitHotkey(); N p*T[J  
 return CWinApp::InitInstance(); (&87 zk  
} 1JU je  
o=#ym4hJ%  
int CHookApp::ExitInstance() -T;^T1  
{ r\#nBoo(  
 VerifyWindow(); N34-z|"q  
 UnInit(); e`U 6JzC  
 return CWinApp::ExitInstance(); XZ{rKf2  
} cHVJ7yAZI  
F+*fim'NK  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 2@?X>,  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) T{^P  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ VwRZgL  
#if _MSC_VER > 1000 _;0RW  
#pragma once ,;5%&T  
#endif // _MSC_VER > 1000 mI{Fs|9h  
Aqmw#X  
class CCaptureDlg : public CDialog Ywv\9KL  
{ -"S94<Y  
 // Construction %WKBd \O  
 public: "f<gZsb  
  BOOL bTray;  *U6+b  
  BOOL bRegistered; YlUh|sK7m  
  BOOL RegisterHotkey(); Z*f%R\u  
  UCHAR cKey; k H<C9z2=  
  UCHAR cMask;  ^|zag  
  void DeleteIcon(); < qab\M0W  
  void AddIcon(); JIw?]xa*  
  UINT nCount; :*h1ik4t  
  void SaveBmp(); ^n<YO=|u  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor h,B4Tg'  
  // Dialog Data %FM26^  
  //{{AFX_DATA(CCaptureDlg) , `Z4fz:  
  enum { IDD = IDD_CAPTURE_DIALOG }; G u_\ySV/y  
  CComboBox m_Key; ykJ+LS{+  
  BOOL m_bControl; 6M`gy|"(~  
  BOOL m_bAlt; ,u^{zYoW  
  BOOL m_bShift; vf@j d}?  
  CString m_Path; jIr\.i  
  CString m_Number; /n(0w`   
  //}}AFX_DATA R4VX*qkB  
  // ClassWizard generated virtual function overrides [;7zg@Sa  
  //{{AFX_VIRTUAL(CCaptureDlg)  K> 4w  
 public: X<.l(9$  
  virtual BOOL PreTranslateMessage(MSG* pMsg); T [xIn+w  
 protected: ]UEA"^  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 7gV9m9#  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); eR>8V8@  
  //}}AFX_VIRTUAL &y1iLk h^  
  // Implementation s@iY'11  
 protected: )D#}/3s  
  HICON m_hIcon; i.7_i78\"  
  // Generated message map functions qD\9h`a  
  //{{AFX_MSG(CCaptureDlg) D iOd!8Y  
  virtual BOOL OnInitDialog(); 'h0>]A 2|X  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); w' J`$=  
  afx_msg void OnPaint(); $z*"@  
  afx_msg HCURSOR OnQueryDragIcon(); 4G' E< ab  
  virtual void OnCancel(); 8rS;}Bt  
  afx_msg void OnAbout(); {wA8!5Gu  
  afx_msg void OnBrowse(); |n tWMm:(  
  afx_msg void OnChange(); G1e_pszD{o  
 //}}AFX_MSG GRYw_}Aa  
 DECLARE_MESSAGE_MAP() w9<'0wcs  
}; 4v _Hh<%  
#endif ;SjNZi)4d  
SPdEO3  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file aXqig&:  
#include "stdafx.h" Z}0xK6  
#include "Capture.h" CUG"2K9  
#include "CaptureDlg.h" ttJ'6lGXh  
#include <windowsx.h> Yb<:1?76L  
#pragma comment(lib,"hook.lib") GVlT+Rs7  
#ifdef _DEBUG *A8*FX>\F  
#define new DEBUG_NEW k'|yUJ,  
#undef THIS_FILE 7- LjBlH  
static char THIS_FILE[] = __FILE__; sT!?nn3O`  
#endif <yEApWd;  
#define IDM_SHELL WM_USER+1 ~' 955fK>  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); xrBM`Bj0@  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); /D;ugc*3  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; T-ST M"~%  
class CAboutDlg : public CDialog x+za6e_k"  
{ gI2'[OU  
 public: oVZzvK(zR  
  CAboutDlg(); MK/8<i<.  
  // Dialog Data ,4'y(X<R  
  //{{AFX_DATA(CAboutDlg) [o(!/38"@=  
  enum { IDD = IDD_ABOUTBOX }; !LpjTMYs  
  //}}AFX_DATA |y0k}ed  
  // ClassWizard generated virtual function overrides U _A'/p^D  
  //{{AFX_VIRTUAL(CAboutDlg) /%,aX [  
 protected: 0U*f"5F  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Z:AB (c  
  //}}AFX_VIRTUAL L"dN $ A  
  // Implementation $MQ<QP  
 protected: NrXIaN  
  //{{AFX_MSG(CAboutDlg) /*BU5  
  //}}AFX_MSG D]"W|.6@  
  DECLARE_MESSAGE_MAP() s#a`e]#?  
}; *My9r.F5o  
}AB_i'C0  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) y>E:]#F  
{ 2(~Zl\  
 //{{AFX_DATA_INIT(CAboutDlg) wN%lc3[/z2  
 //}}AFX_DATA_INIT '-N 5F  
} #T>?g5I  
O:rf DO  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) dr&G>  
{ s1::\&`za  
 CDialog::DoDataExchange(pDX); -?1R l:rM  
 //{{AFX_DATA_MAP(CAboutDlg) QP50.P5g  
 //}}AFX_DATA_MAP x;bA\b  
} <+ [N*  
l/nBin&YGv  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) >2),HZp^I  
 //{{AFX_MSG_MAP(CAboutDlg) -u"|{5? '  
 // No message handlers Pn9;&`t  
 //}}AFX_MSG_MAP ZD|F"v.  
END_MESSAGE_MAP() EHhc2^e  
 *$DD+]2  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) _fY9u2Y  
: CDialog(CCaptureDlg::IDD, pParent) y*sVimx  
{ Vfk"}k/do  
 //{{AFX_DATA_INIT(CCaptureDlg) CC3 i@  
  m_bControl = FALSE; {t! &x:  
  m_bAlt = FALSE; C|IHRw`[  
  m_bShift = FALSE; I;wxgWOP  
  m_Path = _T("c:\\"); (vD==n9Hd  
  m_Number = _T("0 picture captured."); 8Ara^Xh}q  
  nCount=0; 3[_WTwX0  
  bRegistered=FALSE; $?z} yx$  
  bTray=FALSE; v_U/0 0  
 //}}AFX_DATA_INIT ZWS:-]P.  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 X|!@%wuGC  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 45[,LJaMd  
} C}3a  ^j  
T@P~A)>yo  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) WwWOic2  
{ Dmy=_j?ej  
 CDialog::DoDataExchange(pDX); toD!RE  
 //{{AFX_DATA_MAP(CCaptureDlg) ju;OQC~[L]  
  DDX_Control(pDX, IDC_KEY, m_Key); N+ ]O#Js?  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Ce}m$k  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Uea2WJpX  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); E'mT%@M OM  
  DDX_Text(pDX, IDC_PATH, m_Path); e2V;6N  
  DDX_Text(pDX, IDC_NUMBER, m_Number);  %rlqq*  
 //}}AFX_DATA_MAP <1lB[:@%U  
} $\] Mvd  
H l(W'>*oL  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) v)|a}5={  
//{{AFX_MSG_MAP(CCaptureDlg) @m%B>X28F  
 ON_WM_SYSCOMMAND()  Glx{Zu=  
 ON_WM_PAINT() A@d 2Ukv  
 ON_WM_QUERYDRAGICON() 0i8\Lu6  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Syl9j]  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) M3!;u%~} s  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ^e_uprZWm  
//}}AFX_MSG_MAP iKaS7lWH  
END_MESSAGE_MAP() z.)*/HGJm  
I(&N2L$-  
BOOL CCaptureDlg::OnInitDialog() Si23w'T  
{ :TKx>~`  
 CDialog::OnInitDialog(); ? ][/hL@[  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); +G!# /u1  
 ASSERT(IDM_ABOUTBOX < 0xF000); #7:ah  
 CMenu* pSysMenu = GetSystemMenu(FALSE); W:wSM *  
 if (pSysMenu != NULL) fn7?g  
 { OaoHN& "  
  CString strAboutMenu; #^|2PFh5  
  strAboutMenu.LoadString(IDS_ABOUTBOX); YB)I%5d;{  
  if (!strAboutMenu.IsEmpty()) %Rr_fSoV  
  { DW7Jk"\GH  
   pSysMenu->AppendMenu(MF_SEPARATOR); -cn`D2RP  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); N;}X$b5Y @  
  } 5BLBcw\;  
 } j3+ hsA/(k  
 SetIcon(m_hIcon, TRUE); // Set big icon e iH&<AH  
 SetIcon(m_hIcon, FALSE); // Set small icon V5 9Vf[i|  
 m_Key.SetCurSel(0); 9]G~i`QQ  
 RegisterHotkey(); :]8A;`G}  
 CMenu* pMenu=GetSystemMenu(FALSE); ZtGk Md$  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); c;yp}k]\  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); /Gb)BJk!  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); l;aO"_E1m  
 return TRUE; // return TRUE unless you set the focus to a control 7N vRZ!  
} `@6y Wb:X  
1Zo3K<*J  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) #!yX2lR  
{ /a-s9<  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) W_/$H_04+  
 { HuSE6an  
  CAboutDlg dlgAbout; G2>s#Y5(,  
  dlgAbout.DoModal(); r`+G9sj3U  
 } ]D2 d=\  
 else :Us+u-~  
 { *|L;&XM&/  
  CDialog::OnSysCommand(nID, lParam); 2Mw`  
 } K^b'<} $|p  
} EQHCw<e  
8r0;054  
void CCaptureDlg::OnPaint() k#V\O2lb  
{ H2+Ijn19E  
 if (IsIconic()) K}whqe]j  
 { pd.pY*B<[  
  CPaintDC dc(this); // device context for painting *J4 \KU  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); -"2%+S{  
  // Center icon in client rectangle !L)|N<  
  int cxIcon = GetSystemMetrics(SM_CXICON); Z)u_2e  
  int cyIcon = GetSystemMetrics(SM_CYICON); AuBBSk8($  
  CRect rect; 00Ye ]j_  
  GetClientRect(&rect); !0KN A1w,  
  int x = (rect.Width() - cxIcon + 1) / 2; =C)2DWJ1  
  int y = (rect.Height() - cyIcon + 1) / 2; {G|= pM\'  
  // Draw the icon Wh%@  
  dc.DrawIcon(x, y, m_hIcon); "%rU1/@#  
 } J~ z00p`E  
 else wo86C[  
 { W<~u0AyO 3  
  CDialog::OnPaint(); y;.5AvfD  
 } $ 93j;  
} Je K0><  
8ux  
HCURSOR CCaptureDlg::OnQueryDragIcon() o7v9xm+  
{ ;_=dB[M  
 return (HCURSOR) m_hIcon; $JK,9G[Vu  
} 2 jxh7\zE  
PvxU.  
void CCaptureDlg::OnCancel() mMK 93Ng"&  
{ qUQP.4Z95  
 if(bTray) '|&?$g(\h  
  DeleteIcon(); r|953e  
  CDialog::OnCancel();  SmAF+d  
} _2}/rwVg  
Vg"vC  
void CCaptureDlg::OnAbout() k/Ao?R=@gI  
{ S09Xe_q  
 CAboutDlg dlg; O%} hNTS"  
 dlg.DoModal(); +\cG{n*  
} t6%zfm   
R:44Gv7  
void CCaptureDlg::OnBrowse() &?9~e>.OS  
{ BGO pUy  
 CString str;  ~>3#c#[  
 BROWSEINFO bi; "@jYZm8  
 char name[MAX_PATH]; ~yRKNH*M  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); _G^4KwYp  
 bi.hwndOwner=GetSafeHwnd(); -x>2Wb~%  
 bi.pszDisplayName=name; lt0byn$vz  
 bi.lpszTitle="Select folder"; LdX'V]ITh  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; d}^hZ8k|  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); nc#} \  
 if(idl==NULL) M&rbXi.  
  return; lBG"COu  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); CG!9{&F  
 str.ReleaseBuffer(); @@6c{r^P  
 m_Path=str; |q\Rvt$d  
 if(str.GetAt(str.GetLength()-1)!='\\') % )}rQqQ  
  m_Path+="\\"; (/_w23rr  
 UpdateData(FALSE); [](] "r  
} C'joJEo  
O F?o  
void CCaptureDlg::SaveBmp() ^`9O$.'@  
{ .H86f !=  
 CDC dc; A] f^9F@  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); %^;rYn3  
 CBitmap bm; *adwCiB  
 int Width=GetSystemMetrics(SM_CXSCREEN); 9%?a\#C  
 int Height=GetSystemMetrics(SM_CYSCREEN); ,Q+.kAh !G  
 bm.CreateCompatibleBitmap(&dc,Width,Height); s`dUie}y<  
 CDC tdc; l+^4y_  
 tdc.CreateCompatibleDC(&dc); Qf@ha  
 CBitmap*pOld=tdc.SelectObject(&bm); IG8I<+<o  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); !z+'mF?V+X  
 tdc.SelectObject(pOld); -&LF`V&3w  
 BITMAP btm; uNvdlY]  
 bm.GetBitmap(&btm); 8iUKG  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ?T>)7Y)  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ,Y0qGsV  
 BITMAPINFOHEADER bih; _6\"U5*Y  
 bih.biBitCount=btm.bmBitsPixel; nX+c HF  
 bih.biClrImportant=0; 3?wL)6Uj8J  
 bih.biClrUsed=0; VO,F[E~_  
 bih.biCompression=0; GrM`\MIO  
 bih.biHeight=btm.bmHeight; $1|65j[e  
 bih.biPlanes=1; )!=X?fz,O  
 bih.biSize=sizeof(BITMAPINFOHEADER); j<d,7  
 bih.biSizeImage=size; hsZ@)[/:  
 bih.biWidth=btm.bmWidth; !=vd:,  
 bih.biXPelsPerMeter=0; 7@!3.u1B  
 bih.biYPelsPerMeter=0; D.x&N~-  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Q\*zF,ek  
 static int filecount=0; " 8g\UR"[  
 CString name; <s (o?U  
 name.Format("pict%04d.bmp",filecount++); %VO>6iVn  
 name=m_Path+name; #>">fs]  
 BITMAPFILEHEADER bfh; ,y[w`Q\  
 bfh.bfReserved1=bfh.bfReserved2=0; f2i9UZ$=e!  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 7k#0EhN1>  
 bfh.bfSize=54+size; zw%1 a 3!  
 bfh.bfOffBits=54; Xcci)",!  
 CFile bf; S 0mt8/ M  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ vF'Y; M  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); D'"l%p  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 3\a VZx!  
  bf.WriteHuge(lpData,size); Qs8Rb]%|  
  bf.Close(); ?p &Xf>K  
  nCount++; J L2g!n= K  
 } Ev1gzHd!i  
 GlobalFreePtr(lpData); m/aA q8  
 if(nCount==1) )C0 y<:</  
  m_Number.Format("%d picture captured.",nCount); M HKnHPv  
 else f(*iagEy  
  m_Number.Format("%d pictures captured.",nCount); <-=g)3_  
  UpdateData(FALSE); tjcG^m} _  
} {[r}gS%  
ZE6W"pbjU  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) g"X!&$ &  
{ O7zj8  
 if(pMsg -> message == WM_KEYDOWN) ?q}:ojrs1  
 { \|C~VU@  
  if(pMsg -> wParam == VK_ESCAPE) {:`XhPS<B  
   return TRUE; YZ/2 :[b  
  if(pMsg -> wParam == VK_RETURN) 'F Cmbry  
   return TRUE; l +# FoN  
 } E5t /-4  
 return CDialog::PreTranslateMessage(pMsg); W-4R;!42  
} 94u~:'t>V  
?2Sm f  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) kntULI$`  
{ %[k"A  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ JYa3xeC;  
  SaveBmp(); jUrUM.CJ\N  
  return FALSE; p1 mY!&e(  
} !~ZAm3GwL  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 3U[:N &Jb  
 CMenu pop; | =tGrHL  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); j%fi*2uX  
 CMenu*pMenu=pop.GetSubMenu(0); }syU(];s  
 pMenu->SetDefaultItem(ID_EXITICON); 3ZX#6*(}2  
 CPoint pt; He  LW*  
 GetCursorPos(&pt); Ap!i-E,"J  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); !w:pb7+G  
 if(id==ID_EXITICON) E#c9n%E\sz  
  DeleteIcon(); D]+@pK b  
 else if(id==ID_EXIT) rVDOco+w  
  OnCancel(); dp*E#XCr1  
 return FALSE; 6MelN^\[7  
} Q `z2SYz>  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 9PJnKzQ4  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) muIJeQ.C  
 AddIcon(); Rh{`#dI~=  
 return res; 5O:4-} hz  
} :Oi}X7\  
a*!9RQ  
void CCaptureDlg::AddIcon() 9Q&]5| x  
{ 6'jgjWEe3&  
 NOTIFYICONDATA data; 4+F@BxpB  
 data.cbSize=sizeof(NOTIFYICONDATA); TZa LB}4  
 CString tip; t7,**$ST  
 tip.LoadString(IDS_ICONTIP); !s[ gv1  
 data.hIcon=GetIcon(0); 8,]wOxwqi  
 data.hWnd=GetSafeHwnd(); 9oj0X>| 1  
 strcpy(data.szTip,tip); nSq$,tk(  
 data.uCallbackMessage=IDM_SHELL; G( #EW+  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; !r9~K^EI  
 data.uID=98; 3tCT"UvTD  
 Shell_NotifyIcon(NIM_ADD,&data); y+$a}=cb0  
 ShowWindow(SW_HIDE); Ba9"IXKH  
 bTray=TRUE; +D M,+{}  
} %=i/MFGX  
YG6Y5j[-X~  
void CCaptureDlg::DeleteIcon() j`_tb   
{ <E7y:%L[Go  
 NOTIFYICONDATA data; ) {4$oXQ  
 data.cbSize=sizeof(NOTIFYICONDATA); jN!sL W  
 data.hWnd=GetSafeHwnd(); ``Rg0o  
 data.uID=98; )wk9(|[o  
 Shell_NotifyIcon(NIM_DELETE,&data); hGo/Ve+@  
 ShowWindow(SW_SHOW); SQDc%I>b  
 SetForegroundWindow(); r-&* `Jh  
 ShowWindow(SW_SHOWNORMAL); o> yo9n%t  
 bTray=FALSE; xm> y3WC  
} WWv.kglz  
MG3xX;  
void CCaptureDlg::OnChange() - *xn`DH  
{ VaTA|=[;  
 RegisterHotkey(); A2I\T, Z  
} +jj] tJ$[  
+"PME1  
BOOL CCaptureDlg::RegisterHotkey() A1x    
{ \;!g@?CA  
 UpdateData(); J|e3 UikA  
 UCHAR mask=0; fILD~  
 UCHAR key=0; NP$ D9#   
 if(m_bControl) >&)|fV&4  
  mask|=4; U sV?}  
 if(m_bAlt) 7h\U}!  
  mask|=2; QX+&[G!DZH  
 if(m_bShift) dSbz$Fct  
  mask|=1; sUpSXG-W/@  
  key=Key_Table[m_Key.GetCurSel()]; 6x@4gP y[  
 if(bRegistered){ ~oeX0l>F  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 6tup^Rlo;$  
  bRegistered=FALSE; #x(3>}  
 } ]9hhAT44  
 cMask=mask; /rv=ml pRL  
 cKey=key; (o1o);AO  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 'HvJ]}p  
 return bRegistered; GX%r-  
} &M2fcw?  
G[Jz(/yNH  
  四、小结 TGI`}#  
Y2(,E e2  
  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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