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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: ^&?,L@fW  
  .gJ2P?  
  一、实现方法 mw 28E\U  
I`0-q?l  
  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: cj[b^Wv:  
>s^$ -  
#pragma data_seg("shareddata") [7@ g*!+d  
HHOOK hHook =NULL; //钩子句柄 >_?i)%+)  
UINT nHookCount =0; //挂接的程序数目 4`,(*igEv  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 @)U.Dbm  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 U>PZ3  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey *2zp>(%  
static int KeyCount =0; BmX'%5ho  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 MLWHO$C~T  
#pragma data_seg() d)AYY}pw  
h0PDFMM<  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 z By%=)`  
;R*-cm  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: jaoZ}}V_$  
2`f{D~w  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR w<9rTHG8,  
cKey,UCHAR cMask) h]oUY.Pf  
{ _RIU,uJs  
 BOOL bAdded=FALSE; p1KhI;^  
 for(int index=0;index<MAX_KEY;index++){ z(\a JW  
  if(hCallWnd[index]==0){ aoN\n]g  
   hCallWnd[index]=hWnd;  _<S!tW  
   HotKey[index]=cKey; st RM *.  
   HotKeyMask[index]=cMask; !zE{`H a~  
   bAdded=TRUE; yLC[-.H  
   KeyCount++; |o5eG><  
   break; ]M5~p^ RB  
  } }n9(|i+  
 } bB_LL  
 return bAdded; Jp=qPG|  
} TWRP|i!i  
//删除热键 RCR= W6  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) oV%:XuywT  
{ VExhN';  
 BOOL bRemoved=FALSE; B"GC|}N )v  
 for(int index=0;index<MAX_KEY;index++){ ;"MChk  
  if(hCallWnd[index]==hWnd){ *J-pAN  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ G8M~}I/)  
    hCallWnd[index]=NULL; O)dnr8*  
    HotKey[index]=0; uuY^Q;^I*  
    HotKeyMask[index]=0; CQWXLQED>  
    bRemoved=TRUE; DsHF9Mn  
    KeyCount--; -$Fj-pO\  
    break; J8:s=#5  
   } C7%R2>}?f  
  } HgQjw!  
 } !eyLh&]5  
 return bRemoved; GY$Rkg6d  
} FSEf0@O:  
,t`V^(PEq  
vvxxwZa=O  
  DLL中的钩子函数如下: 0>|q[SC  
^EUR#~b5iy  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) geG0F}oC!  
{ wsQnjT>  
 BOOL bProcessed=FALSE; *?m)VvR>|  
 if(HC_ACTION==nCode) X/4CXtX^  
 { 'NtI bS  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 R (f:UC  
   switch(wParam) %ztZ#h~g  
   {  S\:^#Yi`  
    case VK_MENU: [K4cxqlfk  
     MaskBits&=~ALTBIT; &ivU4rEG  
     break; >#G%2Vp  
    case VK_CONTROL: |Rf j 0+  
     MaskBits&=~CTRLBIT; G+c&e:ip<  
     break; xv]z>4@z,  
    case VK_SHIFT: [7@blU  
     MaskBits&=~SHIFTBIT; #z(:n5$F  
     break; %],BgLhS.  
    default: //judge the key and send message  kORWj<  
     break; { I{ 0rV  
   } 3WwS+6R  
   for(int index=0;index<MAX_KEY;index++){ Dge#e  
    if(hCallWnd[index]==NULL) >6C\T@{lJ  
     continue; 5=TgOS]R  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) r8m}B#W7  
    { )g:5}+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); mV^w|x  
     bProcessed=TRUE; M XG>|  
    } o26Y }W  
   } 0C<\m\|~k  
  } [(n5-#1S  
  else if((lParam&0xc000ffff)==1){ //有键按下 Q,NnB{R  
   switch(wParam) \Tz|COG5h\  
   { XC3)#D#HGh  
    case VK_MENU: K GgtEh|  
     MaskBits|=ALTBIT; *ra)u-  
     break; ]t 0o%w  
    case VK_CONTROL: 5Dkb/Iagi  
     MaskBits|=CTRLBIT; li*S^uSF  
     break; N]W*ei  
    case VK_SHIFT: Nn_fhc>  
     MaskBits|=SHIFTBIT; WDw<kX6p  
     break; 2? E;(]dQ  
    default: //judge the key and send message 1| sem(t  
     break; n{QyqI  
   } 08ZvRy(Je<  
   for(int index=0;index<MAX_KEY;index++){ V[.{cY ?6  
    if(hCallWnd[index]==NULL) SWdmej[  
     continue; 8#QT[H 4F  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) J`5VE$2M  
    { (U 'n1s/X  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 12^uu)6Xm,  
     bProcessed=TRUE; <Y)14w%  
    } oywPPVxj  
   } 29:2Xu i  
  } ;<i u*a  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 |Y"XxM9  
   for(int index=0;index<MAX_KEY;index++){ RC7F/|w.z  
    if(hCallWnd[index]==NULL) j([b)k=  
     continue; 5]i#l3")  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) IgbuMEfL  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 'fn}I0Vc  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 [],[LkS  
   } EeYL~ORdi  
  } le5@WG/x  
 } URVW5c  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 5j`sJvq  
} !8p>4|VM  
xI<l1@  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 'wPX.h?  
^$oa`B^2JM  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Apu- 9|oP  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ]:f.="  
^?e[$}  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: >.SO2w  
<);j5)/  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Uv59 XF$  
{ M.H!dZ  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) S:!5 |o|  
 { }6l:'nW  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Xf;!w:u  
  SaveBmp(); G:e=9qTf  
  return FALSE; \B')2phE  
 } 3JD62wtx  
 …… //其它处理及默认处理 p7+{xXf  
} 1 k!gR  
W<<G  'Km  
6`9QGi,)  
  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。 pRfKlTU\  
k[mp(  
  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。 Z( :\Vj"  
jpi,BVTI-X  
  二、编程步骤 JSg=9p$  
l4kqz.Z-g  
  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"; ,U9j7E<4  
6%EpF;T`  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ,8*A#cT B  
<w&'E6mU  
  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; t_^cqEr  
&# fPJc  
  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; Wda?$3!^q  
@%g:'^/  
  5、 添加代码,编译运行程序。 gB#!g@  
${Lrj}93  
三、程序代码 v0r:qku  
C=c&.-Nb9  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Cdl"TZ<  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) jGLmgJG-P  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 6 w!qZ4$  
#if _MSC_VER > 1000 ="T}mc  
#pragma once i.9}bw 9u@  
#endif // _MSC_VER > 1000 ';eAaDM  
#ifndef __AFXWIN_H__ SMvlEj^  
#error include 'stdafx.h' before including this file for PCH T>| +cg  
#endif q|YnNk>1  
#include "resource.h" // main symbols Wr Wz+5M8  
class CHookApp : public CWinApp [GyPwb-  
{ ]@SEOc@ j  
 public: (6[<+j&.  
  CHookApp(); o ^w^dgJ  
  // Overrides >a@1y8B  
  // ClassWizard generated virtual function overrides :SFf}  
  //{{AFX_VIRTUAL(CHookApp) x^3K=l;N  
 public: }f> 81[^  
  virtual BOOL InitInstance(); aQhT*OT{Q  
  virtual int ExitInstance(); rDaiA x&  
  //}}AFX_VIRTUAL v-$X1s  
  //{{AFX_MSG(CHookApp) !6.LSY,E  
  // NOTE - the ClassWizard will add and remove member functions here. bjUe+ #BL  
  // DO NOT EDIT what you see in these blocks of generated code ! "7 alpjwb  
  //}}AFX_MSG 2aivc,m{r  
  DECLARE_MESSAGE_MAP() &}gH!5L m  
}; ]mBlXE:Z  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); #)D$\0ag  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); BI2'NN\  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Q-_;.xy#4  
BOOL InitHotkey(); a&)$s;  
BOOL UnInit(); !G;BYr>X  
#endif  OG IN-  
a"O9;&}; &  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. #;2mP6a[  
#include "stdafx.h" :@~3wD[y  
#include "hook.h" _uh@fRyh  
#include <windowsx.h> @zR_[s  
#ifdef _DEBUG };(2 na  
#define new DEBUG_NEW oz'jt} ?  
#undef THIS_FILE $v{s b,  
static char THIS_FILE[] = __FILE__; wj$3 L3  
#endif g[2[ zIB=  
#define MAX_KEY 100 w2"]%WS%  
#define CTRLBIT 0x04 7<Ut/1$MI  
#define ALTBIT 0x02 |b Z 58{}  
#define SHIFTBIT 0x01 H_JT"~_2  
#pragma data_seg("shareddata") }LBrk0]  
HHOOK hHook =NULL; ~}YgZ/U7T  
UINT nHookCount =0; "(F:'J} X  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey =Oh/4TbW[  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Y$q--JA  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey uN9.U  _  
static int KeyCount =0; arPqVMVr  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift IOUzj{G#  
#pragma data_seg() K!jau|FS  
HINSTANCE hins; 1eqFMf  
void VerifyWindow(); '\7&Iz:%  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) $>~4RXC  
//{{AFX_MSG_MAP(CHookApp) mpCKF=KL.  
// NOTE - the ClassWizard will add and remove mapping macros here. (j}Wt8  
// DO NOT EDIT what you see in these blocks of generated code! i#lO{ ]  
//}}AFX_MSG_MAP =>C3IR/  
END_MESSAGE_MAP() [Az^i>iH  
am WIA`n=  
CHookApp::CHookApp() Qa16x<Xlm  
{ 0w^awT<$6  
 // TODO: add construction code here, {-c[w&q  
 // Place all significant initialization in InitInstance .Wyx#9  
} l&Fx< W  
~i@Z4t j7  
CHookApp theApp; (P:.@P~  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 3Z)vJC9'  
{ 'UCF2 L  
 BOOL bProcessed=FALSE; f#vVk  
 if(HC_ACTION==nCode) bU(fH^  
 { M\9p-%"L  
  if((lParam&0xc0000000)==0xc0000000){// Key up {u7_<G7  
   switch(wParam) ]\R%@FCYc  
   { [k +fkr]  
    case VK_MENU: T8QRO%t  
     MaskBits&=~ALTBIT; :'dH)yO  
     break; Y6%O9b  
    case VK_CONTROL: gJn_8\,C>Q  
     MaskBits&=~CTRLBIT; CI?M2\<g  
     break; D #twS  
    case VK_SHIFT: _Ai\XS Am  
     MaskBits&=~SHIFTBIT; tdRnRoB  
     break; .7zdA IKW  
    default: //judge the key and send message 5@Lz4 `  
     break; wvSaq+N  
   } 0/%VejZ'  
   for(int index=0;index<MAX_KEY;index++){ *}i.,4+y   
    if(hCallWnd[index]==NULL)  F_%&,"$  
     continue; cbA90 8@s  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8-R; &  
    { D(S^g+rd  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); *$ 7c||J7  
     bProcessed=TRUE; OGO4~Up  
    } ?Da!QH >,]  
   } 8BJ&"y8H  
  } |a {*r.  
  else if((lParam&0xc000ffff)==1){ //Key down r(qU~re'  
   switch(wParam) l7JY`x  
   { V-iY2YiR  
    case VK_MENU: aq,?  
     MaskBits|=ALTBIT; of:xj$dQ_  
     break; E^jb#9\R  
    case VK_CONTROL: U,u\o@3A  
     MaskBits|=CTRLBIT; *X lnEHv  
     break; <yrl_vl{  
    case VK_SHIFT: '%9e8C|  
     MaskBits|=SHIFTBIT; q>ps99[=  
     break; -i?-Xj#%  
    default: //judge the key and send message |q\:3R_0  
     break; S-6 %mYf  
   } :u53zX[v  
   for(int index=0;index<MAX_KEY;index++) )b AcU  
   { Hlq#X:DCn  
    if(hCallWnd[index]==NULL) gg%OOvaj5  
     continue; O}#h^AU-BS  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) f~? MNJ2  
    { 4h~o>(Sq  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); .qBf`T;  
     bProcessed=TRUE; h{cJ S9e}  
    } toCT5E_0=  
   } +Te;LJP  
  } s k_Q\0a  
  if(!bProcessed){ EWg\\90  
   for(int index=0;index<MAX_KEY;index++){ wGf SVA-q\  
    if(hCallWnd[index]==NULL) _6 |lw&o07  
     continue; LY^pmak  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Hh8)d/D  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ~O}LAzGb  
   } v [ 4J0  
  } @nS+!t{  
 }  + >oA@z  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 7,2bR  
} 0xM\+R~,  
0"L_0 t:  
BOOL InitHotkey() #}W^d^-5t5  
{ =X11x)]F9  
 if(hHook!=NULL){ Rs cU=oaKi  
  nHookCount++; \Z^YaKj&  
  return TRUE; Q_F8u!qrZ  
 } Q=%1@ ,x"  
 else ~sSlfQWMzy  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 0ZXG{Gp9S  
  if(hHook!=NULL) tPHDnh^n]  
   nHookCount++; \]W*0t>s  
  return (hHook!=NULL); C<\|4ERp  
} n LZ  
BOOL UnInit() l(@UpV-  
{ G~I@'[ur  
 if(nHookCount>1){ Q!:J.J  
  nHookCount--; /K"koV;  
  return TRUE; d[5?P?h')  
 } 8`*Wl;9u  
 BOOL unhooked = UnhookWindowsHookEx(hHook); G.,dP +i  
 if(unhooked==TRUE){ :.IVf Zw  
  nHookCount=0; @<tkwu  
  hHook=NULL; mRw &^7r  
 } a 8Jn.!  
 return unhooked; +tNu8M@xFo  
} Uzb~L_\Rmt  
jLf.qf8qm  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) &C+pen) Z  
{ nxP>IfSA  
 BOOL bAdded=FALSE; eFUJASc  
 for(int index=0;index<MAX_KEY;index++){ wTGH5}QZ+  
  if(hCallWnd[index]==0){ DDT)l+:XP  
   hCallWnd[index]=hWnd; $e7dE$eH  
   HotKey[index]=cKey; MkG3TODfHB  
   HotKeyMask[index]=cMask; X9#;quco@  
   bAdded=TRUE; AAE8j.  
   KeyCount++; Tt.wY=,K  
   break; ?A /+DRQ(  
  } vl<W`)'  
 } i*'6"  
 return bAdded; V_?5cwZ  
} :;S]jNy}j)  
$UAmUQg)}_  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) e`fN+  
{ LoQm&3/  
 BOOL bRemoved=FALSE; #N?EPV$  
 for(int index=0;index<MAX_KEY;index++){ xZ} 1dq8  
  if(hCallWnd[index]==hWnd){ +^ n\?!  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ j^}p'w Tu{  
    hCallWnd[index]=NULL; J)iy6{0"  
    HotKey[index]=0; WhsTKy&E  
    HotKeyMask[index]=0; Rw\ LVRdA  
    bRemoved=TRUE; q"@Y2lhD!  
    KeyCount--; E-_FxBw  
    break; mYf7?I~  
   } wIIxs_2Q0c  
  } C d)j %  
 } E=.4(J7K  
 return bRemoved; w%&lCu@v  
} .V9/0  
j()<.h;'  
void VerifyWindow() +(*S@V$c  
{ ;#G)([  
 for(int i=0;i<MAX_KEY;i++){ -(4)lw>U  
  if(hCallWnd!=NULL){ 445}Yw5;9  
   if(!IsWindow(hCallWnd)){ =#||&1U$  
    hCallWnd=NULL; Q<.84 7 )  
    HotKey=0; b/:&iG;  
    HotKeyMask=0; x,a(O@  
    KeyCount--; h\ema|  
   } 5"=qVmT)  
  } Z> jk\[  
 } %Ji@\|Zkf  
} 8|uFW7Q  
p9ligs7V'  
BOOL CHookApp::InitInstance() ?'_E$  
{ a,3} o:f  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); fJ_d ,4  
 hins=AfxGetInstanceHandle(); I6d4<#Q@L  
 InitHotkey(); ^| L@f  
 return CWinApp::InitInstance(); GE]cH6E  
} fX=o,=-f  
ZtPq */'  
int CHookApp::ExitInstance() yES+0D5<  
{ z;GR(;w/  
 VerifyWindow(); c`94a SnV  
 UnInit(); ) # le|Rf  
 return CWinApp::ExitInstance(); pZ?7'+u$L  
} \M-}(>Pfk  
x}t,v.:  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ^W|B Xxo  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 1@*qz\ YY  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ @Omgk=6  
#if _MSC_VER > 1000 ;v0M ::  
#pragma once aV?dy4o$  
#endif // _MSC_VER > 1000 WZ @/'[  
e"9 u}-Q@  
class CCaptureDlg : public CDialog jEwfa_Q%  
{ zi7,?bD  
 // Construction Sq"O<FmI  
 public: *5'U3py  
  BOOL bTray; cs[_5r&:  
  BOOL bRegistered; ,2\?kPoc8  
  BOOL RegisterHotkey(); Te=[tx~x  
  UCHAR cKey; 9~8 A>  
  UCHAR cMask; f>\guuG  
  void DeleteIcon(); :=qblc  
  void AddIcon(); R#OVJ(#  
  UINT nCount; :r%H sur(  
  void SaveBmp(); <smi<syx  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 41f4zisZ  
  // Dialog Data `NqX{26GV+  
  //{{AFX_DATA(CCaptureDlg) dHp(U :)  
  enum { IDD = IDD_CAPTURE_DIALOG }; a g Za+a  
  CComboBox m_Key; xxWrSl`fB  
  BOOL m_bControl; /XtpGk_1)  
  BOOL m_bAlt; $e66jV  
  BOOL m_bShift; n#,<-Rb-  
  CString m_Path; =SJwCT0;  
  CString m_Number; #w\Bc\  
  //}}AFX_DATA d4OWnPHv&}  
  // ClassWizard generated virtual function overrides ck-ab0n  
  //{{AFX_VIRTUAL(CCaptureDlg) fx &b*O C  
 public: $^|I?5xD  
  virtual BOOL PreTranslateMessage(MSG* pMsg); * 7: )k  
 protected: oxkA+}^j8M  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support TX7B(JZD  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 5ve4u  
  //}}AFX_VIRTUAL <xOv0B  
  // Implementation T~B'- >O  
 protected: o4I&?d7;"  
  HICON m_hIcon; |DAe2RK  
  // Generated message map functions > <cK  
  //{{AFX_MSG(CCaptureDlg) 1<Fh aK  
  virtual BOOL OnInitDialog(); hs'J'~a  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); rO8Q||@>A  
  afx_msg void OnPaint(); NHKIZx8sR  
  afx_msg HCURSOR OnQueryDragIcon(); kkfwICBI  
  virtual void OnCancel(); Q2[@yRY/z  
  afx_msg void OnAbout(); N\ nr  
  afx_msg void OnBrowse(); )aY^k|I  
  afx_msg void OnChange(); n{oRmw-  
 //}}AFX_MSG +3B^e%`NPm  
 DECLARE_MESSAGE_MAP() "YLH]9"=  
}; fAMJFHW  
#endif e_3KNQ`kA  
L@> +iZSO  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file H]v"_!(\  
#include "stdafx.h" ="fq.Tt  
#include "Capture.h" !FwR7`i  
#include "CaptureDlg.h" x!$Dje}  
#include <windowsx.h> Ta;'f7Oz  
#pragma comment(lib,"hook.lib") # 3{g6[Y  
#ifdef _DEBUG >Xz P'h  
#define new DEBUG_NEW +^!;J/24  
#undef THIS_FILE HD"Pz}k4  
static char THIS_FILE[] = __FILE__; mQ#E{{:H+  
#endif >y<yFO{  
#define IDM_SHELL WM_USER+1 K}^Jf ;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); vwZd@%BO  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); S,&tKDJn  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; GtZkzVqLd  
class CAboutDlg : public CDialog =*f>vrme  
{ WH Zz?|^  
 public: 4 I}xygV  
  CAboutDlg(); ~_vzss3-C  
  // Dialog Data z:PH _N~  
  //{{AFX_DATA(CAboutDlg) 8ut:cCrmg  
  enum { IDD = IDD_ABOUTBOX }; b?&=gm%oU  
  //}}AFX_DATA zPwU'TbF  
  // ClassWizard generated virtual function overrides YLc 2:9  
  //{{AFX_VIRTUAL(CAboutDlg) `V N $ S  
 protected: "]BefvE  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 4fe$0mye  
  //}}AFX_VIRTUAL )u{)"m`&[J  
  // Implementation <.c@l,[.z  
 protected: JDO5eEwj  
  //{{AFX_MSG(CAboutDlg) Y,1sNg  
  //}}AFX_MSG p)M\q fZ  
  DECLARE_MESSAGE_MAP() ~z''kH=e  
}; J:M)gh~#  
f@roRn8p?  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) XxT7YCi  
{ Bsm>^zZ`YU  
 //{{AFX_DATA_INIT(CAboutDlg) $)OUOv  
 //}}AFX_DATA_INIT mi~ BdBv  
} 79J@`  
0(9]m)e  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) BV=L.*  
{ LM_/:  
 CDialog::DoDataExchange(pDX); Pw4j?pv2  
 //{{AFX_DATA_MAP(CAboutDlg) %,9iY&;U"  
 //}}AFX_DATA_MAP *|c*/7]<  
} mPR(4Ol.  
t >89( k  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ^/+0L[R  
 //{{AFX_MSG_MAP(CAboutDlg) 7h?yAgDv~  
 // No message handlers p{:r4!*L  
 //}}AFX_MSG_MAP  o^59kQT  
END_MESSAGE_MAP() j[/'`1tOe  
\-c8/=  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/)  >m!l5/  
: CDialog(CCaptureDlg::IDD, pParent) <,~ =o  
{ iR-MuDM  
 //{{AFX_DATA_INIT(CCaptureDlg) 13s0uyYU<m  
  m_bControl = FALSE;  YM9oVF-  
  m_bAlt = FALSE; Q ! 5P  
  m_bShift = FALSE; Ed/@&52z0  
  m_Path = _T("c:\\"); Gmcx#?|Tx  
  m_Number = _T("0 picture captured."); Is6<3eQ\x  
  nCount=0; &lYKi3}x  
  bRegistered=FALSE; Zp|LCE"  
  bTray=FALSE; f[)_=T+  
 //}}AFX_DATA_INIT }vOUf# ^k  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 cK.T=7T  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); md[FtcY\  
} CL(,Q8yG  
^&t(O1.-  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Qi^MfHW  
{ Vy = fm  
 CDialog::DoDataExchange(pDX); ]y 6`9p  
 //{{AFX_DATA_MAP(CCaptureDlg) fTi,S)F'  
  DDX_Control(pDX, IDC_KEY, m_Key); Xq&x<td  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); zE V J  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 8uME6]m i  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); @URLFMFi  
  DDX_Text(pDX, IDC_PATH, m_Path); nbYkr*: "t  
  DDX_Text(pDX, IDC_NUMBER, m_Number); H3 _7a9  
 //}}AFX_DATA_MAP FAu G`zu  
} an3HKfv  
T6f{'.w  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 6Rn_@_Nn)f  
//{{AFX_MSG_MAP(CCaptureDlg) $;*YdZ`q  
 ON_WM_SYSCOMMAND() l79jd%/m  
 ON_WM_PAINT() q>&F%;q1]  
 ON_WM_QUERYDRAGICON() ?r@euZ&  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ypXKw7f(  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) )>,b>7  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 4ei .-  
//}}AFX_MSG_MAP Y_`D5c:  
END_MESSAGE_MAP() `$`:PT\Zv4  
{+[~;ISL  
BOOL CCaptureDlg::OnInitDialog() %+$P<Rw7  
{ xmtbSRgK9  
 CDialog::OnInitDialog(); ' U(v  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); )61CrQiY  
 ASSERT(IDM_ABOUTBOX < 0xF000); ~4Is   
 CMenu* pSysMenu = GetSystemMenu(FALSE); dJ`Fvj  
 if (pSysMenu != NULL) $4kc i@.  
 { XKp%7;  
  CString strAboutMenu; yz-IZt(  
  strAboutMenu.LoadString(IDS_ABOUTBOX); sZ-]yr\E"  
  if (!strAboutMenu.IsEmpty()) c1/G yq  
  {  $J mL)r  
   pSysMenu->AppendMenu(MF_SEPARATOR); 8QYG"CA6/  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); sTqy-^e7  
  } +7<{yP6wU  
 } h~elF1dG  
 SetIcon(m_hIcon, TRUE); // Set big icon bWv6gOPR3  
 SetIcon(m_hIcon, FALSE); // Set small icon PKC``+K i  
 m_Key.SetCurSel(0); K_nN|'R-  
 RegisterHotkey(); > c7/E  
 CMenu* pMenu=GetSystemMenu(FALSE); fRT:@lV  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); bi!4I<E>k  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); <Q=ES,M  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ^e8R 43w:!  
 return TRUE; // return TRUE unless you set the focus to a control 5h[u2&;G  
} mU_?}}aK,  
M@Q=!!tQ(  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) UA,&0.7  
{ +nd'Uf   
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) lf|e8kU\f  
 { U6X~]|o  
  CAboutDlg dlgAbout; xpyb&A  
  dlgAbout.DoModal(); *NV`6?o@6  
 } K_`*ZV{r  
 else w;QDQ fx0  
 { $E|W|4N  
  CDialog::OnSysCommand(nID, lParam); #`GW7(M  
 } G"MpA[a_  
} zx(j6  
Kggf!\MR8  
void CCaptureDlg::OnPaint() 1:7>Em<s  
{ D4'? V Iz  
 if (IsIconic()) Bx&` $lW  
 { 0 P/A  
  CPaintDC dc(this); // device context for painting O( he  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ~B(]0:  
  // Center icon in client rectangle d5A!kU _.  
  int cxIcon = GetSystemMetrics(SM_CXICON); Z;S*fS-_  
  int cyIcon = GetSystemMetrics(SM_CYICON); Z/wh?K3y  
  CRect rect; Dr`\  
  GetClientRect(&rect); &t%CuU]/@  
  int x = (rect.Width() - cxIcon + 1) / 2; B<1*p,z  
  int y = (rect.Height() - cyIcon + 1) / 2; A&9l|b-"  
  // Draw the icon ~J<bwF  
  dc.DrawIcon(x, y, m_hIcon); O%o#CBf0  
 } NG'VlT  
 else ErESk"2t  
 { EFql g9bK  
  CDialog::OnPaint(); ?xQ lX%&`6  
 } d?N"NqaN  
} kTi QO2H  
p w>A Q  
HCURSOR CCaptureDlg::OnQueryDragIcon() zp4ru\  
{ ?%Y?z ]L#  
 return (HCURSOR) m_hIcon; 3!Qt_,  
} Y1k/ngH  
";s5It  
void CCaptureDlg::OnCancel() GJO/']k  
{ qsvUJU  
 if(bTray) Wlg(z%  
  DeleteIcon(); <Dm6CH  
  CDialog::OnCancel(); +{hxEDz  
} F5 LQgK-z  
iqy}|xAU  
void CCaptureDlg::OnAbout() +crAkb}i  
{ `zzX2R Je  
 CAboutDlg dlg; a m<R!(  
 dlg.DoModal(); =~=/ dq  
} $elrX-(vL  
R8'yQ#FVy  
void CCaptureDlg::OnBrowse() e_1mO 5z  
{ 1 9 k$)m  
 CString str; n[4Nu`E9  
 BROWSEINFO bi; CPVKz   
 char name[MAX_PATH]; VdeK~#k  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); $#RD3#=?u  
 bi.hwndOwner=GetSafeHwnd(); j%p~.kW5  
 bi.pszDisplayName=name; ]`. d%Vx  
 bi.lpszTitle="Select folder"; Z}NAH`V`:+  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 'R,d?ikY  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ZC2C`S\xr  
 if(idl==NULL) 6km u'vw  
  return; fykN\b  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); x *qef_Hu  
 str.ReleaseBuffer(); xh-[]Jz(  
 m_Path=str; H <1?<1^  
 if(str.GetAt(str.GetLength()-1)!='\\') raqLXO!j  
  m_Path+="\\"; 3$Is==>7  
 UpdateData(FALSE); I.8|kscM  
} 0'py7  
awkVjyqX  
void CCaptureDlg::SaveBmp() BB%(!O4Dl  
{ (Wx)YI  
 CDC dc; Ap!UX=HBb  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 0H>Fyl2_  
 CBitmap bm; 7_K(x mK  
 int Width=GetSystemMetrics(SM_CXSCREEN); tjd"05"@:  
 int Height=GetSystemMetrics(SM_CYSCREEN); vj^U F(X  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ZH0f32K  
 CDC tdc; N!h>fE`  
 tdc.CreateCompatibleDC(&dc); N"T8 Pt  
 CBitmap*pOld=tdc.SelectObject(&bm); Q?"[zX1  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); /6q/`vx@  
 tdc.SelectObject(pOld); E`?BaCrG~  
 BITMAP btm; cEqh|Q  
 bm.GetBitmap(&btm); P);Xke  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; )K?GAj]Pq  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ! 4oIx`  
 BITMAPINFOHEADER bih; 5t<]|-i!  
 bih.biBitCount=btm.bmBitsPixel; #>- rKv.A  
 bih.biClrImportant=0; |wLQ)y*  
 bih.biClrUsed=0; ##s !-.T  
 bih.biCompression=0; 6sZRR{'  
 bih.biHeight=btm.bmHeight; :jUuw:\  
 bih.biPlanes=1; YAPD7hA  
 bih.biSize=sizeof(BITMAPINFOHEADER); /GXO2zO  
 bih.biSizeImage=size; 9{TOFjsF  
 bih.biWidth=btm.bmWidth; ReE3742@  
 bih.biXPelsPerMeter=0; 3?%kawO&  
 bih.biYPelsPerMeter=0; <>e<Xd:77{  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); W@ Z=1y  
 static int filecount=0; X*JD  
 CString name; Hug{9Hr3.  
 name.Format("pict%04d.bmp",filecount++); 7S1!|*/ I  
 name=m_Path+name; kyjH~mK4  
 BITMAPFILEHEADER bfh; yBe/UFp+  
 bfh.bfReserved1=bfh.bfReserved2=0; _bd#C   
 bfh.bfType=((WORD)('M'<< 8)|'B'); PR'FSTg  
 bfh.bfSize=54+size; ]bR'J\Fwl  
 bfh.bfOffBits=54; :5*<QJuI#A  
 CFile bf; 6=g7|}  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ vJCL m/}*  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); sY6'y'a95  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 5 rWRE-  
  bf.WriteHuge(lpData,size); )m'_>-`^:  
  bf.Close(); P\AH9#XL  
  nCount++; UF%5/SiVX  
 } 3LxJ}>]TO  
 GlobalFreePtr(lpData); }O>Zu[8a  
 if(nCount==1) ;VuB8cnL`  
  m_Number.Format("%d picture captured.",nCount); os.x|R]_  
 else C C09:L?  
  m_Number.Format("%d pictures captured.",nCount); eLTNnz  
  UpdateData(FALSE); BE+Y qT  
} YHA[PF   
{Psj#.qP1  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) \'EWur"  
{ !K 9(OX2;  
 if(pMsg -> message == WM_KEYDOWN) EK#m?O:>  
 { kC k-  
  if(pMsg -> wParam == VK_ESCAPE) Y{yr-E #~M  
   return TRUE; 2G-? P"4l@  
  if(pMsg -> wParam == VK_RETURN) 1CM1u+<iZ  
   return TRUE; *nc4X9  
 } [>:gwl _\  
 return CDialog::PreTranslateMessage(pMsg); 8$vH&Hd I  
} C5M-MZaS  
H<xC%/8  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) -,;Ep'  
{ <^\r9Qxl  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ \nHlI=!P  
  SaveBmp(); :A'!u r=\  
  return FALSE; <S}qcjG  
} kW~F*  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ?c2TT Q  
 CMenu pop; B1M/5cr.  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); FSmi.7  
 CMenu*pMenu=pop.GetSubMenu(0); @Y,F&8a$  
 pMenu->SetDefaultItem(ID_EXITICON); uqUo4z5T  
 CPoint pt; Z:v1?v  
 GetCursorPos(&pt); _UBI,Dg]  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); '=H^m D+gl  
 if(id==ID_EXITICON) qck/b  
  DeleteIcon(); +B m+Pj>  
 else if(id==ID_EXIT) @ 7?_Yw  
  OnCancel(); )1vojp 4Za  
 return FALSE; o W[,EW+u  
} w!}1oy  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 6a?y $+pr  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) vVW=1(QWI#  
 AddIcon(); o.5j@ dr  
 return res; vO_quQ[.  
} c7F&~RLC  
X w8i l  
void CCaptureDlg::AddIcon() H5s85"U#  
{ x/7G0K2\}  
 NOTIFYICONDATA data; ]#$kA9  
 data.cbSize=sizeof(NOTIFYICONDATA); bIArAS9%  
 CString tip; 8w&rj-  
 tip.LoadString(IDS_ICONTIP); lnDDFsA  
 data.hIcon=GetIcon(0); s=TjM?)  
 data.hWnd=GetSafeHwnd(); -T?IkL)  
 strcpy(data.szTip,tip); PNKT\yd  
 data.uCallbackMessage=IDM_SHELL; xu =B  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; _@N)]!\MgP  
 data.uID=98; dM UDLr-  
 Shell_NotifyIcon(NIM_ADD,&data); `X='g96C1  
 ShowWindow(SW_HIDE); tD]&et  
 bTray=TRUE; 32iI :u  
} JF*g!sV%  
>, E$bm2  
void CCaptureDlg::DeleteIcon()  9+QrTO  
{ 5E!m! nBZ  
 NOTIFYICONDATA data; B`scuLl3  
 data.cbSize=sizeof(NOTIFYICONDATA); qN[7zsaj  
 data.hWnd=GetSafeHwnd(); N%f!B"NQ  
 data.uID=98;  nvPE N  
 Shell_NotifyIcon(NIM_DELETE,&data); D-GU"^-9  
 ShowWindow(SW_SHOW); `#rfp 9w  
 SetForegroundWindow(); /6?plt&CA  
 ShowWindow(SW_SHOWNORMAL); y!gM)9vq  
 bTray=FALSE; j7 =3\SO  
} LJwMM  
M0SH-0T;Z  
void CCaptureDlg::OnChange() pV6HQ:y1  
{ 4w( vRe  
 RegisterHotkey(); IxZ.2 67  
} n\-_i2yy  
^\&g^T%  
BOOL CCaptureDlg::RegisterHotkey() ;a&:r7]=  
{ oKi1=d+T  
 UpdateData(); el?V2v[  
 UCHAR mask=0; } +4Bf+u:  
 UCHAR key=0; &a_kJ)J  
 if(m_bControl) m@.{zW7bO  
  mask|=4; @$P!#z  
 if(m_bAlt) $Je"z]cy-  
  mask|=2; 4nH91Z9=  
 if(m_bShift) *Qx|5L!_  
  mask|=1; 9ET+k(wI@  
  key=Key_Table[m_Key.GetCurSel()]; -FN6sNvIh  
 if(bRegistered){ [ 5W#1 &  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 9r nk\`E  
  bRegistered=FALSE; em [F|  
 } "O[76}I+.q  
 cMask=mask; ^<\} Y  
 cKey=key; !t Oky  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); g&3#22z  
 return bRegistered; uq4s bkP  
} SrtVoe[  
qW~ R-g]  
  四、小结 cIvYfgIo9  
e=l5j"gq  
  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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