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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: 'vKB]/e;  
  e _\]Q-  
  一、实现方法 e6n1/TtqM  
~_v?M%5i  
  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: |&vQ1o|}  
| _/D-m*  
#pragma data_seg("shareddata") 1(6B|w5+  
HHOOK hHook =NULL; //钩子句柄 9 ! [oJ3  
UINT nHookCount =0; //挂接的程序数目 vUD,%@k9  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ~7aBli=  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ~#3h-|]*  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey UO(B>Abp  
static int KeyCount =0; MJ^NRT0?b  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1  5|2v6W!e  
#pragma data_seg() g _fvbVX  
xo#&&/6  
  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。 D6&fDhO27  
.ruGS.nS4  
  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: /5M@>A^?'  
9An_zrJ%i  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR fRKO> /OT  
cKey,UCHAR cMask) GFd~..$  
{ -AwR$<q'  
 BOOL bAdded=FALSE; @ @$=MSN  
 for(int index=0;index<MAX_KEY;index++){ Rt!G:hy7  
  if(hCallWnd[index]==0){ -N`j` zb|  
   hCallWnd[index]=hWnd; u,<I%  
   HotKey[index]=cKey; {6Tw+/`P  
   HotKeyMask[index]=cMask; X51pRP $R  
   bAdded=TRUE; 3\FPW1$i|[  
   KeyCount++; *yp}#\rk  
   break; Pe@M_ r  
  } Qd"{2>  
 } m[&]#K6  
 return bAdded; ~J1;Z0}#  
} |0:&d w?*!  
//删除热键 Ep-{Ew{T_=  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) v w$VR PW  
{ .&d]7@!qy  
 BOOL bRemoved=FALSE; |@pJ]  
 for(int index=0;index<MAX_KEY;index++){ Gs$<r~Tg  
  if(hCallWnd[index]==hWnd){ mlCw(i,  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ F. X{(8  
    hCallWnd[index]=NULL; M##h<3I  
    HotKey[index]=0; zRtaO'G(  
    HotKeyMask[index]=0; t6p}LNm(V  
    bRemoved=TRUE; pQr `$:ga  
    KeyCount--; xi=Z<G  
    break; JzH\_,,  
   } 0KqGJ :Ru  
  } '/+l\.z"&  
 } 4~-"k{Xt  
 return bRemoved; b}'XDw   
} VQE8hQ37  
"'p;Udt/Qm  
oj*5m+:>a  
  DLL中的钩子函数如下: t{?UNW  
<%klrQya  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) vU Bk oC2Q  
{ |__\Vn  
 BOOL bProcessed=FALSE; VgG*y#Qf$  
 if(HC_ACTION==nCode) #mY*H^jI]~  
 { hKv3;jcd  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 VyK]:n<5Q  
   switch(wParam) p~1,[]k  
   {  J1DX}h]  
    case VK_MENU: b*=eMcd  
     MaskBits&=~ALTBIT; + 5E6|  
     break; %.,-dV'  
    case VK_CONTROL: J^[>F{8!n  
     MaskBits&=~CTRLBIT; QUd`({/@:  
     break; ]5IG00`  
    case VK_SHIFT: tU7,nE>p  
     MaskBits&=~SHIFTBIT; A2 r1%}{  
     break; )@)wcf!b  
    default: //judge the key and send message |GgFdn`>  
     break; ?_36uJo}  
   } "e62g  
   for(int index=0;index<MAX_KEY;index++){ NYtp&[s2-  
    if(hCallWnd[index]==NULL) s>d@=P>R  
     continue; 5|YpkY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) dn/0>|5OF(  
    { n[4F\I>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); }R5>ja0  
     bProcessed=TRUE; *qKPZb~  
    } vy W/f  
   } 1zNH[   
  } # JHicx\8l  
  else if((lParam&0xc000ffff)==1){ //有键按下 nTO,d$!Kp  
   switch(wParam) WCxt-+#  
   { oLVy?M%{P  
    case VK_MENU: H%NP4pK  
     MaskBits|=ALTBIT; B$A`-  
     break; Lf_`8Ux  
    case VK_CONTROL: `` (D01<  
     MaskBits|=CTRLBIT; 0/?V _  
     break; 1iBOf8  
    case VK_SHIFT: 5Z{i't0CQ  
     MaskBits|=SHIFTBIT; u'cM}y&  
     break; [ L% -lJ  
    default: //judge the key and send message jSVIO v:  
     break; ]S+NH[g+  
   } >?s[g)np  
   for(int index=0;index<MAX_KEY;index++){ D?~`L[}I!}  
    if(hCallWnd[index]==NULL) 82#7TX4  
     continue; :lz@G 4 =C  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) KP" lz  
    { a$!|)+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); *BzqAi0  
     bProcessed=TRUE; d dB}mk6  
    } 4:<74B  
   } UZsL0  
  } R,[ dEP  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 b|| c^f  
   for(int index=0;index<MAX_KEY;index++){ E O^j,x g  
    if(hCallWnd[index]==NULL) +{Yd\{9  
     continue; _r+2o-ZR  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) cLl=?^DB  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); t_1(Ex  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 B|E4(,]^  
   } 1,,kU  
  } [5Zs%!Z;8N  
 } mX))*e4k  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); "IbXKS>t  
} b 'p0T1K(  
LAqmM3{fA  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: =\ ]5C  
SYkLia(Ty  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); TZ8:3ti  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); *aF#on{  
n$B SO  
  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: `j+aAxJ=\  
{RFpTh7f:  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Do-~-d4  
{ . 7WNd/WG  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) L{_Q%!h3]  
 { Y'tPD#|r  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 n[$bk_S  
  SaveBmp(); eZpyDw C{  
  return FALSE; HD^Ou5YB  
 } o%dKi]  
 …… //其它处理及默认处理 +[386  
} K,f*}1$qM  
r(=  
3ZRi@=kWz  
  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。 $80 TRB#  
' lt5|  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 rqJ'm?>cr  
h/`]=kCl  
  二、编程步骤 _XLGXJ[B  
hRK&  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; F91uuSSL  
\*] l'>x1  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; cE (P^;7D  
2d1Z;@x  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; (I(?oCQ  
1Pya\To,m  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; %eK=5Er jx  
[ 6+iR  
  5、 添加代码,编译运行程序。 @ \{L%y%a0  
bYs K|n  
三、程序代码 lG[@s 'j  
+fh@m h0[  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL }_,\yC9F  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) yjcZTvjJ  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ S5o\joc  
#if _MSC_VER > 1000 awYnlE/Z1  
#pragma once (i..7B:  
#endif // _MSC_VER > 1000 Uk@du7P1k  
#ifndef __AFXWIN_H__ %x}iEqkU  
#error include 'stdafx.h' before including this file for PCH n1yIQ8F  
#endif HpbSf1VvAf  
#include "resource.h" // main symbols <Wd#HKIG>l  
class CHookApp : public CWinApp B{}<DP.  
{ NUSb7<s,&Y  
 public: ,|5|aVfh  
  CHookApp(); QMO.Bnek  
  // Overrides ~PaEhj&8  
  // ClassWizard generated virtual function overrides 244[a] %&;  
  //{{AFX_VIRTUAL(CHookApp) n 0/<m.  
 public: AW{"9f4  
  virtual BOOL InitInstance(); 7'IcgTWDZy  
  virtual int ExitInstance(); "Zh3,  
  //}}AFX_VIRTUAL 2Dc2uU@`r  
  //{{AFX_MSG(CHookApp) uU$YN-  
  // NOTE - the ClassWizard will add and remove member functions here. k7L-J  
  // DO NOT EDIT what you see in these blocks of generated code ! 7uUo DM  
  //}}AFX_MSG rXh*nC  
  DECLARE_MESSAGE_MAP() X RQz~Py  
}; _%R]TlL  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); "O}u2B b  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); )~X.x"}8k  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); \\R$C  
BOOL InitHotkey(); Zk:Kux[7  
BOOL UnInit(); T]_]{%z  
#endif VTUY#+3  
* \$m1g7b  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. &~Hx!]uc  
#include "stdafx.h" gJ=y7yX  
#include "hook.h" o=]\Jy  
#include <windowsx.h> R:+cumHr  
#ifdef _DEBUG n g,&;E  
#define new DEBUG_NEW V|3^H^\5P  
#undef THIS_FILE c0ue[tb  
static char THIS_FILE[] = __FILE__; wU}%]FqtZ=  
#endif |tr^ `Z  
#define MAX_KEY 100 Ndz'^c  
#define CTRLBIT 0x04 m[}@\y  
#define ALTBIT 0x02 xY d]|y  
#define SHIFTBIT 0x01 iJU=98q  
#pragma data_seg("shareddata") ,{C hHnJ%#  
HHOOK hHook =NULL; le|Rhs%Z%  
UINT nHookCount =0; J?9n4 u  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey dW5@Z-9  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT =]fOQN`  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey &cp `? k  
static int KeyCount =0; s-801JpiJ  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift <kCOg8<y :  
#pragma data_seg() 3\ {?L  
HINSTANCE hins; G' '9eV$  
void VerifyWindow(); .<zN/&MXf  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) WYN0,rv1:+  
//{{AFX_MSG_MAP(CHookApp) Q?2Gw N  
// NOTE - the ClassWizard will add and remove mapping macros here. \0veld  
// DO NOT EDIT what you see in these blocks of generated code! `iN H`:[w  
//}}AFX_MSG_MAP nv <t$r  
END_MESSAGE_MAP() _)S['[  
Q~f mVWq  
CHookApp::CHookApp() (M2hK[  
{ =D&XE*qkZ  
 // TODO: add construction code here, ]++,7Z\AU  
 // Place all significant initialization in InitInstance YuUJgt .1  
} Oz4vV_a&'  
5gSe=|we*p  
CHookApp theApp; Ay6]vU  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) E?0Vo%Vh  
{ 2~l+2..  
 BOOL bProcessed=FALSE; d=0{vsrB  
 if(HC_ACTION==nCode) t52KF#+>  
 { GOsOFs"I  
  if((lParam&0xc0000000)==0xc0000000){// Key up H0f]Swh0a  
   switch(wParam) QM24cm T  
   { D}`MY\H  
    case VK_MENU: tlM >=s'T  
     MaskBits&=~ALTBIT; |'``pq/}_  
     break; Nwo*tb:  
    case VK_CONTROL: PLJDRp 2o  
     MaskBits&=~CTRLBIT; {%\@Z-9%q,  
     break; %ol\ sO|  
    case VK_SHIFT: dZY|6  
     MaskBits&=~SHIFTBIT; mT/^F{c  
     break; 4F"%X &$  
    default: //judge the key and send message =M6{{lI/  
     break; ]K'OH&  
   } fR b  
   for(int index=0;index<MAX_KEY;index++){ jwg*\HO,s  
    if(hCallWnd[index]==NULL) ~z(0XKq0d  
     continue; }5;/!P_A  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0 ;].q*|#  
    { ^u2x26].  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); D~FIv  
     bProcessed=TRUE; 'h@&rr@5  
    } nIZsKbnw  
   } rp4{lHw>C/  
  } ^ E_chx-e}  
  else if((lParam&0xc000ffff)==1){ //Key down 9{}"tk5$h  
   switch(wParam) yFn~rv|&G  
   { 5|7<ZL 3  
    case VK_MENU: uz I-1@`  
     MaskBits|=ALTBIT; wv`ar>qVL  
     break; l_4 ^TYF  
    case VK_CONTROL: PC\p>6xT  
     MaskBits|=CTRLBIT; /'zXb_R,$  
     break; PI@?I&Bo  
    case VK_SHIFT: xLb=^Xjec  
     MaskBits|=SHIFTBIT; iUFG!,+d  
     break; }ik N  
    default: //judge the key and send message dq%C~j{v  
     break; BnfuI  
   } M(yWE0 3  
   for(int index=0;index<MAX_KEY;index++) 4\ |/S@.  
   { >5E1y!  
    if(hCallWnd[index]==NULL) j;qV+Rq]t  
     continue; 89j:YfA=v  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $E!f@L  
    { #|3,DZ|)F  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); R )4,f~@"  
     bProcessed=TRUE; fq4uiFi<  
    } EM@EB< pRX  
   } (.iwD&  
  } H DD)AM&p  
  if(!bProcessed){ M]M>z>1*v  
   for(int index=0;index<MAX_KEY;index++){ Y DW^N] G  
    if(hCallWnd[index]==NULL) acar-11_o/  
     continue; <CJy3<$u  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 1M 6^Brx  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); cW_l|  
   } o~W,VhCP  
  } LitdO>%#2  
 } 6xA xLZz<  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); >y,. `ECn  
} K<r5jb  
Y@< j vH1  
BOOL InitHotkey() ,`OQAJ)>  
{ \rATmjsKzS  
 if(hHook!=NULL){ s|:1z"q  
  nHookCount++; {-Mjs BR  
  return TRUE; f& \ Bs8la  
 } *0?@/2&  
 else yTn<5T[H  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); QC!SgV  
  if(hHook!=NULL) | lZJt  
   nHookCount++; T$AVMVq  
  return (hHook!=NULL); k.jBu  
} #6~Bg)7AM  
BOOL UnInit() K3UN#G)U  
{ l]#=I7 6  
 if(nHookCount>1){ [Y?Y@x"MZ  
  nHookCount--; ms!|a_H7 r  
  return TRUE; 6`G8UDK>F  
 } I.(@#v7T  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ?E(X>tH  
 if(unhooked==TRUE){ aG]^8`~>'  
  nHookCount=0; $uJc/  
  hHook=NULL; =kzp$ i  
 } 1 ?Zw  
 return unhooked; i7v =o#  
} `W" ;4A  
nHH FHnFf  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) #d*gWwnx"  
{ 6O.kKhk  
 BOOL bAdded=FALSE; om9'A=ZU  
 for(int index=0;index<MAX_KEY;index++){ hW/Ve'x[  
  if(hCallWnd[index]==0){ arRU`6?  
   hCallWnd[index]=hWnd; Ewq@>$_!  
   HotKey[index]=cKey; $$W2{vr7+  
   HotKeyMask[index]=cMask; l 9g  
   bAdded=TRUE; I"x~ 7  
   KeyCount++; 2/tx5Nc  
   break; _dz ZS(7M6  
  } dKC*QHU  
 } Xdl dUK[  
 return bAdded; m"n" 1;o=  
} nf<I  
Y'bz>@1(  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) &WL::gy_S  
{ (xWsyo(4  
 BOOL bRemoved=FALSE; ' Q(kx*;  
 for(int index=0;index<MAX_KEY;index++){ _x3=i\O,  
  if(hCallWnd[index]==hWnd){ Eu "8IM!%-  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ XEagN:  
    hCallWnd[index]=NULL; nnN$?'%~6  
    HotKey[index]=0; OI"g-+~  
    HotKeyMask[index]=0; +:=FcsY  
    bRemoved=TRUE; ceD6q~)  
    KeyCount--; {X{S[(|  
    break; x3#:C=  
   } i=]R1yP  
  } 3N+B|WrM  
 } _G@Z n[v  
 return bRemoved; !L q'o ?  
} "\`Fu  
c}|.U  
void VerifyWindow() z~tdLtcX  
{ "aI)LlyCY  
 for(int i=0;i<MAX_KEY;i++){ i>[xN[U(  
  if(hCallWnd!=NULL){ M*D_p n&  
   if(!IsWindow(hCallWnd)){ tc)Md]S  
    hCallWnd=NULL; 8!3q:8y8  
    HotKey=0; OHj>ufwVq  
    HotKeyMask=0; ZI qXkD  
    KeyCount--; *{j;LA.BR#  
   } 67&Q<`V1*q  
  } pX*E(Q)@!  
 } 3D!7,@&>3  
} $ta JVVF  
4&%H;Q  
BOOL CHookApp::InitInstance() \}u/0UF97  
{ (Cq 38~mR  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ?wv3HN  
 hins=AfxGetInstanceHandle(); m9MY d  
 InitHotkey(); l;A'^  
 return CWinApp::InitInstance(); WQ.{Ag?1  
} );i J9+ V}  
;-Os~81o?  
int CHookApp::ExitInstance() );}M"W8  
{ y= f.;  
 VerifyWindow(); a73VDQr I  
 UnInit(); .m8l\h^3  
 return CWinApp::ExitInstance(); T ,!CDm$=  
} u,`3_I^  
GHn0(o&K  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 9+@z:j  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 0V]MAuD($  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ NB'G{),)Z  
#if _MSC_VER > 1000 qLb~^'<iD  
#pragma once htL1aQ.  
#endif // _MSC_VER > 1000 )4s7,R  
B hx.q,X  
class CCaptureDlg : public CDialog mLkp*?sfC  
{ 'jE/Tre^  
 // Construction Xf#;`*5  
 public: :E|Jqi\  
  BOOL bTray; "nfi :A1  
  BOOL bRegistered; ,X:3w3nr^  
  BOOL RegisterHotkey(); x7^VU5w#  
  UCHAR cKey; 517wduj  
  UCHAR cMask; r#1W$~?>  
  void DeleteIcon(); &=M4Z/Ao  
  void AddIcon(); .o]I^3tf c  
  UINT nCount; "M/) LXn:0  
  void SaveBmp(); Q(aNa!  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ni2 [K`  
  // Dialog Data dMsS OP0E  
  //{{AFX_DATA(CCaptureDlg) Bsg^[~jWJu  
  enum { IDD = IDD_CAPTURE_DIALOG }; F:#5Edo}A  
  CComboBox m_Key; 8(y%]#n  
  BOOL m_bControl; x0{B7/FN  
  BOOL m_bAlt; S#oBO%!  
  BOOL m_bShift; pV (Mh[ }P  
  CString m_Path; YU+P+m2X  
  CString m_Number; N#RC;  
  //}}AFX_DATA 1,$"'lKwt  
  // ClassWizard generated virtual function overrides X[$|I9  
  //{{AFX_VIRTUAL(CCaptureDlg) %g5#q64  
 public: P*K"0[\n  
  virtual BOOL PreTranslateMessage(MSG* pMsg); A Y<L8  
 protected: *,:2O&P  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support RFFbS{U*  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 5[B)U">]  
  //}}AFX_VIRTUAL b&4JHyleF  
  // Implementation X 5}=|%Y  
 protected: uqI'e_&=&5  
  HICON m_hIcon; 6bjZW ~  
  // Generated message map functions {g`!2"  
  //{{AFX_MSG(CCaptureDlg) -:'%YHxX  
  virtual BOOL OnInitDialog(); [N~-9  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam);  >Z3>  
  afx_msg void OnPaint(); <*^|Aj|#  
  afx_msg HCURSOR OnQueryDragIcon(); tq~f9EvC  
  virtual void OnCancel(); 2-ksr}:  
  afx_msg void OnAbout(); "[fPzIP9  
  afx_msg void OnBrowse(); M;3q.0MU  
  afx_msg void OnChange(); pp1Kor  
 //}}AFX_MSG sUmpf4/  
 DECLARE_MESSAGE_MAP() 'WmjQsf  
}; NKB["+S<  
#endif T|h!06   
'-n Iy$>  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file F !OD*]  
#include "stdafx.h" `^on`"\{u  
#include "Capture.h" :6)!#q'g  
#include "CaptureDlg.h" 5Rw2/J L  
#include <windowsx.h> e:4,rfF1  
#pragma comment(lib,"hook.lib") hJ[keaO  
#ifdef _DEBUG }1V+8'D  
#define new DEBUG_NEW JzCkVF$  
#undef THIS_FILE ZrNH:Z:5  
static char THIS_FILE[] = __FILE__; 3Rsrb  
#endif \r{wNqyv  
#define IDM_SHELL WM_USER+1 ThW9=kzQW  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); bJ"2|VNH(  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {E)tzBI;^  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; }QQl.'  
class CAboutDlg : public CDialog lH/" 47  
{ [N%InsA9k  
 public: =MM+(mD  
  CAboutDlg(); ~Eik&5 z  
  // Dialog Data 5eF tcK  
  //{{AFX_DATA(CAboutDlg) Iix:Y}  
  enum { IDD = IDD_ABOUTBOX }; {&D$U'ye  
  //}}AFX_DATA 76o[qay  
  // ClassWizard generated virtual function overrides ;ZcwgsxTM  
  //{{AFX_VIRTUAL(CAboutDlg) 4L`,G:J,;  
 protected: :2NV;7Wke6  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support [)8O\/:  
  //}}AFX_VIRTUAL 5?Q5cD2]\6  
  // Implementation U+4[w`a}  
 protected: d!Y%7LmSE@  
  //{{AFX_MSG(CAboutDlg) QZ7W:%r(4  
  //}}AFX_MSG Xa ;wx3]t  
  DECLARE_MESSAGE_MAP() "7Kw]8mRR  
}; &"T7KXx  
IIXA)b!  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) YKayaI\*  
{ ?*kB>U9e  
 //{{AFX_DATA_INIT(CAboutDlg) +"WNG  
 //}}AFX_DATA_INIT pjV70D8$A  
} A~k: m0MX  
7TypzgXNe  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) )w&|VvM )L  
{ ^e =xEZD  
 CDialog::DoDataExchange(pDX); q%f90  
 //{{AFX_DATA_MAP(CAboutDlg) 9h-S,q!  
 //}}AFX_DATA_MAP *M:p[.=1  
} g}hNsU=$5~  
+gBD E :  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) u| "YS-dH  
 //{{AFX_MSG_MAP(CAboutDlg) `O.pT{Lf  
 // No message handlers .),9a,  
 //}}AFX_MSG_MAP 'zMmJl}\vd  
END_MESSAGE_MAP() j1+I_   
XS^du{ai  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) V8o, e  
: CDialog(CCaptureDlg::IDD, pParent) {IBbN05 ;  
{ 5RO6YxQ  
 //{{AFX_DATA_INIT(CCaptureDlg) ).u>%4=6  
  m_bControl = FALSE; D?* du#6  
  m_bAlt = FALSE; sH1 ucZ>9Y  
  m_bShift = FALSE; VTDnh*\5  
  m_Path = _T("c:\\"); XPt>klf  
  m_Number = _T("0 picture captured."); (o{x*';i4  
  nCount=0;  k 6@  
  bRegistered=FALSE; C deV3  
  bTray=FALSE; + <w6sPm  
 //}}AFX_DATA_INIT _:Y| a>  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 )M[FPJP}  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 9T`YHA'g  
} zI(uexxPqd  
Ly v"2P  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) @RoU   
{ ,5t_}d|3C=  
 CDialog::DoDataExchange(pDX); @ZV>Cl@%2  
 //{{AFX_DATA_MAP(CCaptureDlg) -\ew,y  
  DDX_Control(pDX, IDC_KEY, m_Key); ?,hGKSC  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); z [u!C/  
  DDX_Check(pDX, IDC_ALT, m_bAlt); N5cC!K  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); z?`7g%Z?{  
  DDX_Text(pDX, IDC_PATH, m_Path); -(%Xq{  
  DDX_Text(pDX, IDC_NUMBER, m_Number); i \lr KA  
 //}}AFX_DATA_MAP 7VkjnG^!:  
} 6BQq|:U  
|Df`Aq(eYJ  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) mc,HliiJ  
//{{AFX_MSG_MAP(CCaptureDlg) tI9p2!  
 ON_WM_SYSCOMMAND() ~Z#\f5yv@  
 ON_WM_PAINT() V!+<  
 ON_WM_QUERYDRAGICON() * "?,.  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) OMYbCy^  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) NW21{}=4  
 ON_BN_CLICKED(ID_CHANGE, OnChange) )B~{G\jS  
//}}AFX_MSG_MAP f|s,%AU"i  
END_MESSAGE_MAP() %JA^b5''  
!|ic{1!_  
BOOL CCaptureDlg::OnInitDialog() 5Go@1X]I  
{ pg<c vok  
 CDialog::OnInitDialog(); r>"l:GZ  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); !@+4&B=  
 ASSERT(IDM_ABOUTBOX < 0xF000); G(hnrRxn  
 CMenu* pSysMenu = GetSystemMenu(FALSE); #xhl@=W;  
 if (pSysMenu != NULL) < r b5'  
 { +tYskx/  
  CString strAboutMenu; "oR%0pU*  
  strAboutMenu.LoadString(IDS_ABOUTBOX); jcxeXp|00  
  if (!strAboutMenu.IsEmpty()) su8()]|0x  
  { sN1I+X  
   pSysMenu->AppendMenu(MF_SEPARATOR); poi39B/Vt  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Ipow Jw^  
  } hrfSe$8  
 } &&96kg3  
 SetIcon(m_hIcon, TRUE); // Set big icon '0qKb*  
 SetIcon(m_hIcon, FALSE); // Set small icon Q b5vyV `  
 m_Key.SetCurSel(0); $KGRpI  
 RegisterHotkey(); #_Lgo  
 CMenu* pMenu=GetSystemMenu(FALSE); 5'(#Sf  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); x.(Sv]+[  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); zj1_#=]  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); pM!cF  
 return TRUE; // return TRUE unless you set the focus to a control <2I<Z'B,e  
} +6<g N[  
reoCyP\!!  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 7V~ gqum  
{ ?U~`'^@  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) UX ?S#:h  
 { 09Z\F^*$F  
  CAboutDlg dlgAbout; vFgnbWxG  
  dlgAbout.DoModal(); bGp3 V. H  
 } 7zXX& S  
 else h~&5;  
 { DwXSlsN3v  
  CDialog::OnSysCommand(nID, lParam); U4._a  
 } DpL|aRdbK  
} "j}fcrlG9  
Bjb8#n04  
void CCaptureDlg::OnPaint() a 0qDRB  
{ *{e,< DV  
 if (IsIconic()) :YmFQ>e?  
 { 9NC'iFQ#  
  CPaintDC dc(this); // device context for painting E I&)+cC  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); l9NET  
  // Center icon in client rectangle ^JB5-EtL(  
  int cxIcon = GetSystemMetrics(SM_CXICON); @c%h fI  
  int cyIcon = GetSystemMetrics(SM_CYICON); ~t.i;eu  
  CRect rect; O-<nL B!Wf  
  GetClientRect(&rect); lhFv2.qR  
  int x = (rect.Width() - cxIcon + 1) / 2; ~NwX,-ri  
  int y = (rect.Height() - cyIcon + 1) / 2; gJ5|P .  
  // Draw the icon nrz2f7d$  
  dc.DrawIcon(x, y, m_hIcon); 59a7%w  
 } Jn1(-  
 else vnv:YQV/ir  
 { 2&:w_KJ  
  CDialog::OnPaint(); t^<ki?*  
 } Q\Nz^~dQ:Y  
} >xm:?WR  
Eg]tDPN1  
HCURSOR CCaptureDlg::OnQueryDragIcon() #)<WQZ)  
{ "3uPK$  
 return (HCURSOR) m_hIcon; 53?B.\  
} /y5a~3  
+{ {'3=x9  
void CCaptureDlg::OnCancel() *JY2vq  
{ aK'%E3!~=x  
 if(bTray) 8$6^S{M3  
  DeleteIcon(); !K_ ke h  
  CDialog::OnCancel(); 7|pF (sb0  
} jb!15Vlt"  
@ u2 P&|:{  
void CCaptureDlg::OnAbout() |(UkI?V  
{ !XrnD#  
 CAboutDlg dlg; fGDjX!3-S  
 dlg.DoModal(); soB5sFt&]  
}  *4{GI D  
$pYT#_P!/  
void CCaptureDlg::OnBrowse() '0E^th#u-0  
{ /Es&~Fn  
 CString str; PQ`~qM:3st  
 BROWSEINFO bi; N:7;c}~  
 char name[MAX_PATH]; mM;p 7 sJ  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); dIRSgJ`  
 bi.hwndOwner=GetSafeHwnd(); ^ )[jBUT  
 bi.pszDisplayName=name; orr6._xw  
 bi.lpszTitle="Select folder"; ojy[<  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; $+Vp>  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); pe7R1{2Q_s  
 if(idl==NULL) SRpPLY{:F  
  return; <+${gu?^  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); a2`|6M;  
 str.ReleaseBuffer(); jM|-(Es. )  
 m_Path=str; d"hW45L  
 if(str.GetAt(str.GetLength()-1)!='\\') jMB&(r  
  m_Path+="\\"; KZt4 dr  
 UpdateData(FALSE); }6^d/nE*T  
} [%yCnt  
58.b@@T  
void CCaptureDlg::SaveBmp() , aQ{  
{ "yc_*R(pU  
 CDC dc; >ay% !X@3"  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); K\vyfYi  
 CBitmap bm; Z{J{6j  
 int Width=GetSystemMetrics(SM_CXSCREEN); C*1,aLSw  
 int Height=GetSystemMetrics(SM_CYSCREEN); $ -n?q w  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Wk&g!FR  
 CDC tdc; 9Fv VM9  
 tdc.CreateCompatibleDC(&dc); lDm0O)Dh!  
 CBitmap*pOld=tdc.SelectObject(&bm); pz@wbu=($4  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); n{v[mqm^  
 tdc.SelectObject(pOld); mtg3}etA  
 BITMAP btm; >YW_}kd  
 bm.GetBitmap(&btm); y72=d?]W  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; &^!vi2$5}  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ;p4|M  
 BITMAPINFOHEADER bih; ZpTT9{PT=:  
 bih.biBitCount=btm.bmBitsPixel; F8%.-.l)  
 bih.biClrImportant=0; 2W 9N-t2 1  
 bih.biClrUsed=0; fu6Ir,  
 bih.biCompression=0; 57eA (uI  
 bih.biHeight=btm.bmHeight; 5 U{}A\q  
 bih.biPlanes=1; WTP~MJ#C  
 bih.biSize=sizeof(BITMAPINFOHEADER); l^*'W(%  
 bih.biSizeImage=size; gx)!0n;  
 bih.biWidth=btm.bmWidth; r @ IyK%  
 bih.biXPelsPerMeter=0; @z1Yj"^Pm  
 bih.biYPelsPerMeter=0; gu~F(Fb'  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); v*k}{M  
 static int filecount=0; h1'j1uI  
 CString name; (lBwkQNQGd  
 name.Format("pict%04d.bmp",filecount++); ^saH^kg1"  
 name=m_Path+name; <; (pol|  
 BITMAPFILEHEADER bfh; %uWq)D4r  
 bfh.bfReserved1=bfh.bfReserved2=0; !uJD hC  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Q(J6;s#b  
 bfh.bfSize=54+size; 8KU5x#  
 bfh.bfOffBits=54; ZdjmZx%%  
 CFile bf; Xitsb f=Gg  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ M@b:~mI[sw  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); J$X{4  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); {"x8 q  
  bf.WriteHuge(lpData,size); K~B@8az  
  bf.Close(); o> i`Jq&  
  nCount++; W~e/3#R\=  
 } Z} Ld!Byz  
 GlobalFreePtr(lpData); 9e*v&A2Y'  
 if(nCount==1) p%+uv\Ix  
  m_Number.Format("%d picture captured.",nCount); `swf~  
 else =6N%;2`84  
  m_Number.Format("%d pictures captured.",nCount); N4JJA+  
  UpdateData(FALSE); {BA1C (  
} K4\#b}P!  
aV9QIH~  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) k;bdzcMkQ  
{ z|:3,$~sN  
 if(pMsg -> message == WM_KEYDOWN) j~@Hj$APa`  
 { IyfhVk?  
  if(pMsg -> wParam == VK_ESCAPE) 1\'zq;I~  
   return TRUE; !jeoB  
  if(pMsg -> wParam == VK_RETURN) !^:)zORYR  
   return TRUE; utDjN"  
 } D[5Qd)PIL  
 return CDialog::PreTranslateMessage(pMsg); wgb e7-{  
} a*4l!-7  
2MapB*  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) n%J {Tcn6  
{ bm+ #OI  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ E0Y>2HOuL  
  SaveBmp(); xy$agt>j>  
  return FALSE; KiDL]2  
} XpLK0YI  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ MvLmEmKb}\  
 CMenu pop; Pq@%MF]5  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Av#_cL  
 CMenu*pMenu=pop.GetSubMenu(0); u\9t+wi}<  
 pMenu->SetDefaultItem(ID_EXITICON); XDWR ]  
 CPoint pt; fi6i{(K  
 GetCursorPos(&pt); O_u2V'jy9  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ~F ,mc.  
 if(id==ID_EXITICON) -J$,W`#z  
  DeleteIcon(); B?c n5  
 else if(id==ID_EXIT) $ MN1:ih  
  OnCancel(); &r)i6{w81  
 return FALSE; N^{"k,vB-  
} kDz!v?Z2+B  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); i^2yq&uT(  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) l^B PTg)X@  
 AddIcon(); C{r Sq  
 return res; ,o3{?o]s  
} >*hY1@N1  
X<OOgC  
void CCaptureDlg::AddIcon() {O4y Y=G  
{ g=T !fF=  
 NOTIFYICONDATA data; <]jKpJ{3N  
 data.cbSize=sizeof(NOTIFYICONDATA); #@*;Y(9Ol  
 CString tip; X \1grM  
 tip.LoadString(IDS_ICONTIP); EO<{Bj=2  
 data.hIcon=GetIcon(0); NZ}DbA+g;|  
 data.hWnd=GetSafeHwnd(); = %O@%v  
 strcpy(data.szTip,tip); sSM^net0  
 data.uCallbackMessage=IDM_SHELL; ^` 96L  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 8N8N)#A[  
 data.uID=98; n%M-L[n  
 Shell_NotifyIcon(NIM_ADD,&data); {Gd<+tQg  
 ShowWindow(SW_HIDE); _qZ?|;o^  
 bTray=TRUE; HFr#Ql>g  
} =Qa*-*  
%SHjJCS3  
void CCaptureDlg::DeleteIcon() yt+"\d  
{ )_vE"ryThA  
 NOTIFYICONDATA data; 7 fE QD?C  
 data.cbSize=sizeof(NOTIFYICONDATA); a2{ nrGD  
 data.hWnd=GetSafeHwnd(); phT|w H  
 data.uID=98; /:YJ2AARY  
 Shell_NotifyIcon(NIM_DELETE,&data); ] X9e|  
 ShowWindow(SW_SHOW); Fjc4[ C  
 SetForegroundWindow(); Hkcr+BQ  
 ShowWindow(SW_SHOWNORMAL); w A0 $d  
 bTray=FALSE; kFJ sB,2-  
} errT7&@,A  
OJkiTs{  
void CCaptureDlg::OnChange() HH\6gs]u  
{ b?p_mQKtZ  
 RegisterHotkey(); f^tCD'Vmi  
} IwE{Zvr  
<0Mc\wy  
BOOL CCaptureDlg::RegisterHotkey() 0nh;0Z  
{ h;^H*Y&`  
 UpdateData(); 8op,;Z7Y  
 UCHAR mask=0; ugZ-*e7  
 UCHAR key=0; HW{si]~q  
 if(m_bControl) D 2U")g}U  
  mask|=4; DH#n7s'b  
 if(m_bAlt) VI}.MnCa  
  mask|=2; ^^ Q'AE  
 if(m_bShift) v-V#?+#  
  mask|=1; Slk__eC  
  key=Key_Table[m_Key.GetCurSel()]; <`B4+:;w6  
 if(bRegistered){ |Ew~3-u!  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); k,~I>qg  
  bRegistered=FALSE; @Gh?|d7bD  
 } "|2|Vju%  
 cMask=mask; f`8]4ms"  
 cKey=key; * 5H  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 7+,6 m!4  
 return bRegistered; (-RZ|VdYg  
} y5td o'Ex  
sd@JQ%O  
  四、小结 ^`W8>czi  
5$v,%~$Xds  
  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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