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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: Pa{)@xT  
  1ud+~y$K  
  一、实现方法 99\;jz7  
hSO(s  
  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: *f?z$46  
|9;6Cp  
#pragma data_seg("shareddata") (L{Kg U&{$  
HHOOK hHook =NULL; //钩子句柄 3y9K'  
UINT nHookCount =0; //挂接的程序数目 AV%?8-  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Zw)*+> +FV  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 eu]t.Co[X  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey m5G9 B-\?  
static int KeyCount =0; 7^fpbrj  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 #9{9T"ed  
#pragma data_seg() hr+,-j  
VPKoBJ&  
  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。 Xy74D/ocui  
*q?-M"K  
  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: T4OH,^J  
",b3C.  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR jAa{;p"jU  
cKey,UCHAR cMask) \,w*K'B_Y  
{ T[z]~MJL  
 BOOL bAdded=FALSE; `sS\8~A  
 for(int index=0;index<MAX_KEY;index++){ >d`XR"_e  
  if(hCallWnd[index]==0){ nPW?DbH +  
   hCallWnd[index]=hWnd; =aWj+ggd@  
   HotKey[index]=cKey; ,s%1#cbR  
   HotKeyMask[index]=cMask; an4^(SY  
   bAdded=TRUE; uN:|4/;{&  
   KeyCount++; .%.kEJh`  
   break; $a.!X8sHB.  
  } UN~dzA~V  
 } :QndeUw  
 return bAdded; <K~> :4c  
} wkn r^A  
//删除热键 \(nb >K  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) LqH<HGMFD  
{ Q3@MRR^tY  
 BOOL bRemoved=FALSE; _f"HUKGN  
 for(int index=0;index<MAX_KEY;index++){ (f-Mm0%[  
  if(hCallWnd[index]==hWnd){ *A^j>lV  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ?g ~w6|U(r  
    hCallWnd[index]=NULL; iXF iFsb  
    HotKey[index]=0; Mu1H*;_8  
    HotKeyMask[index]=0; g9T9TQ-O  
    bRemoved=TRUE; [Iwb7a0p  
    KeyCount--; \zdY$3z  
    break; GlVb |O"  
   } 6~oo.6bA  
  } Wzn!BgxRr  
 } #mK/xbW  
 return bRemoved; ! R b  
} 0P+B-K>n  
LR(Q.x  
*X_-8 ^~  
  DLL中的钩子函数如下: |v Gb,&3  
x)]_]_vX  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) &7fwYV  
{ x;F^7c1  
 BOOL bProcessed=FALSE; nfldj33*  
 if(HC_ACTION==nCode) :rdw0EROy  
 { v^;p]_c~2  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 w!5@PJ)~U  
   switch(wParam) RaT_5PH~g  
   {  - &7\do<  
    case VK_MENU: odPdWV,&*  
     MaskBits&=~ALTBIT; "mk4O4dF  
     break; K> rZJ[a  
    case VK_CONTROL: =V[ey  
     MaskBits&=~CTRLBIT; #A:+|{H"  
     break; z{>p<)h  
    case VK_SHIFT: `R\nw)xq  
     MaskBits&=~SHIFTBIT; rw|;?a0  
     break; pBbfU2p  
    default: //judge the key and send message {hNvCk  
     break; cu@i;Hb@  
   } f Yt y7  
   for(int index=0;index<MAX_KEY;index++){ 0DZ}8"2  
    if(hCallWnd[index]==NULL) O^2@9 w  
     continue; y8!#G-d5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) k$NNpv&;d  
    { y-1!@|l0:6  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 1Z$` }a  
     bProcessed=TRUE; JO&~mio  
    } c*@#0B  
   } v 0 3  
  } G9|w o)N  
  else if((lParam&0xc000ffff)==1){ //有键按下 Hf#VW^  
   switch(wParam) '=V!Y$tn  
   { Pw :{  
    case VK_MENU: bzC| aUGM  
     MaskBits|=ALTBIT; w y\0o  
     break; }j_2K1NS{  
    case VK_CONTROL: 5j{jbo =!  
     MaskBits|=CTRLBIT; 1[ 4)Sq?  
     break; CC~:z/4,N  
    case VK_SHIFT: lR8Lfa*/7  
     MaskBits|=SHIFTBIT; S} &1_I  
     break; 83)m#  
    default: //judge the key and send message )L"J?wTe  
     break; )[E7\pc  
   } !H9zd\wc  
   for(int index=0;index<MAX_KEY;index++){ sv!6z Js  
    if(hCallWnd[index]==NULL) H<*n5r(c  
     continue; +N|t:8qaf  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &~=d;llkT  
    { W7\UZPs5t  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 4Ub7T=LG  
     bProcessed=TRUE; y XCZs  
    } ;_/!F}d  
   } H[?l)nZ}  
  } v\=k[oOu  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 8;3I:z&muQ  
   for(int index=0;index<MAX_KEY;index++){ ]-OF3+l4  
    if(hCallWnd[index]==NULL) >ATccv  
     continue; WvcPOt8Bp>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) i06|P I  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); *M6j)jqV  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 LP?*RrM  
   } L~Xzo  
  } V'l9fj*E  
 } Ol8Yf.e_  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); iu`B8yI  
} }#Kl6x  
XU`vs`/   
  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: suN}6C I  
bZgFea_>i  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); c:-n0m'i  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); E/C3t2@-  
j__l'?s  
  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: W: 3fLXk+  
ql_,U8Jw  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) #\6k_toZ  
{ Bdib)t[  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) f3mQd}<L  
 { ]ia{N  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 d.y-R#F_]  
  SaveBmp(); S\@U3|Q5  
  return FALSE; @-O%u* %J  
 } #ahe@|E'Y  
 …… //其它处理及默认处理 Y>CZ  
} vZ|Wj] ;o  
n-CFB:L  
IG4`f~k^  
  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。 9y;zk$O8  
W'Y#(N[ktP  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 (_Rl f$D  
1sXVuto  
  二、编程步骤 *,Sa*-7(  
9Hs5uBe  
  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"; #mRT>]di`D  
xepp."O  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; <1kK@m -E  
P A$jR fQ  
  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; Y58et9gRO  
<a& $D  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; 'CvV Ktk  
,BlNj^5f  
  5、 添加代码,编译运行程序。 AL[,&_&uV  
#$ ,b )Uy  
三、程序代码 8LGNV&Edg  
3d(:Y6D)  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL y2>AbrJ  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) G]gc*\4  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ +w(B9rH  
#if _MSC_VER > 1000 rC6{-42bb  
#pragma once 1m<8M[6u  
#endif // _MSC_VER > 1000 2h`Tn{&1/  
#ifndef __AFXWIN_H__ WdTia o,r  
#error include 'stdafx.h' before including this file for PCH = Tq\Ag:  
#endif ;~n^/D2.  
#include "resource.h" // main symbols }} zY]A  
class CHookApp : public CWinApp @ "/:Omh  
{ bA/'IF+  
 public: &LHS<Nv^:  
  CHookApp(); kB_T9$0e#  
  // Overrides v}Kj+9h  
  // ClassWizard generated virtual function overrides f_ |=EQ  
  //{{AFX_VIRTUAL(CHookApp) G@o\D-$  
 public: i?'|}tK  
  virtual BOOL InitInstance(); WL}XD Kx  
  virtual int ExitInstance(); b}Xh|0`b+  
  //}}AFX_VIRTUAL 6sNw#pqh  
  //{{AFX_MSG(CHookApp) uMK8V_p*?  
  // NOTE - the ClassWizard will add and remove member functions here. &Yd6w}8  
  // DO NOT EDIT what you see in these blocks of generated code ! uevhW  
  //}}AFX_MSG Uh3N#O  
  DECLARE_MESSAGE_MAP() *fQn!2}=(  
}; ?I ;PJj  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 5a2+6N  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Dh)(?"^9A  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 'oF('uR  
BOOL InitHotkey(); ~SYW@o  
BOOL UnInit(); 8_T9[ ]7V8  
#endif F?b"Rv  
Zo}vV2  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. W@Rb"5Gy+  
#include "stdafx.h" P}"uC`036  
#include "hook.h" `a9iq>   
#include <windowsx.h> ev1:0P  
#ifdef _DEBUG G k:k px  
#define new DEBUG_NEW UZJ#/x5F  
#undef THIS_FILE .a9f)^  
static char THIS_FILE[] = __FILE__; ;1q|SmF  
#endif Pdk#"H-j  
#define MAX_KEY 100 KxQMPtHstz  
#define CTRLBIT 0x04 !k!1 h%7q  
#define ALTBIT 0x02 ^CP>|JWD^  
#define SHIFTBIT 0x01 ^#4Ah[:XA  
#pragma data_seg("shareddata") M# cJ&+rP  
HHOOK hHook =NULL; \W 7pSV-U  
UINT nHookCount =0; zE i\#Zg$  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey K7wU tg  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ^m-w@0^z  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey =-/sB>-C  
static int KeyCount =0; j eyGIY  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift OtoG,~?  
#pragma data_seg() hpYW1kfQl  
HINSTANCE hins; =A(Az  
void VerifyWindow(); n2Ew0-  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) $ J!PSF8PL  
//{{AFX_MSG_MAP(CHookApp) ~"r(PCa@  
// NOTE - the ClassWizard will add and remove mapping macros here. 3)hQT-)  
// DO NOT EDIT what you see in these blocks of generated code! ; KT/;I  
//}}AFX_MSG_MAP %<<JWoB  
END_MESSAGE_MAP() 9s?gI4XN  
>tm4Rg~y  
CHookApp::CHookApp() %$67*pY'JH  
{ rTim1<IXR  
 // TODO: add construction code here, d2Ta&Md  
 // Place all significant initialization in InitInstance vK$wc~  
} L9d|7.b  
A+(+Pf U  
CHookApp theApp; F12$BK DH  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) T9uOOI  
{  '3xK1Am  
 BOOL bProcessed=FALSE; g nw">H  
 if(HC_ACTION==nCode) 0/uy'JvWru  
 { YI2x*t!  
  if((lParam&0xc0000000)==0xc0000000){// Key up RSCQ`.  
   switch(wParam) |\W~+}'g~  
   { ZtY?X- 4_  
    case VK_MENU: 3!`_Q%  
     MaskBits&=~ALTBIT; :KS"&h{SY  
     break; !\cVe;<r  
    case VK_CONTROL: _%(.OR  
     MaskBits&=~CTRLBIT; X2'XbG 3  
     break; B_>r|^Vh  
    case VK_SHIFT: I8k+Rk*  
     MaskBits&=~SHIFTBIT; p$cb&NNh*H  
     break; H'Jz:6   
    default: //judge the key and send message 25<qo{  
     break; . Ctd$  
   } J+}z*/)|#  
   for(int index=0;index<MAX_KEY;index++){ ~zVe?(W  
    if(hCallWnd[index]==NULL) NdrR+t^#  
     continue; H~bbkql  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) V!NRBXg  
    { Y7;=\/SV  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); x<PJ5G L  
     bProcessed=TRUE; yT[=!M  
    } I]BhkJ  
   } p!DOc8a.\e  
  } ^fmuBe}d{  
  else if((lParam&0xc000ffff)==1){ //Key down eKf5orN  
   switch(wParam) \"w+4}  
   { Rw hKW?r+  
    case VK_MENU: {7%(m|(  
     MaskBits|=ALTBIT; Q:Ma3El\  
     break; dNH08q8P  
    case VK_CONTROL: EhvX)s  
     MaskBits|=CTRLBIT; NiK4d{E&  
     break; 9(7-{,c  
    case VK_SHIFT: ~2N"#b&J  
     MaskBits|=SHIFTBIT; FFpT~.  
     break; A#<?4&  
    default: //judge the key and send message .},'~NM]  
     break; v^NIx q}U  
   } q5+4S5R*^  
   for(int index=0;index<MAX_KEY;index++) eA?RK.e  
   { QXFo1m  
    if(hCallWnd[index]==NULL) :#ik. D  
     continue; !zpRrx_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) gzT*-  
    { yYYSeH  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); (gU!=F?#m  
     bProcessed=TRUE; 6l1jMm|= X  
    }  . iI  
   } {9pZ)tB  
  }  `25yE/  
  if(!bProcessed){ MrFQ5:=  
   for(int index=0;index<MAX_KEY;index++){ 3M7/?TMw{6  
    if(hCallWnd[index]==NULL) Vj>8a)"B5a  
     continue; Qv/=&_6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) TBU&6M>{3  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); "OnGE$   
   } u!qP  
  } %FIE\9  
 } {%6`!WW[  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ,7K`[  
} ~Vjl7G\7i  
LTx,cP  
BOOL InitHotkey() t |A-9^t'!  
{ jPW#(3hoE  
 if(hHook!=NULL){ (;^syJrh  
  nHookCount++; = 6\^%  
  return TRUE; ;cN{a&  
 } xAMW-eF?d  
 else x39<6_?G  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); :'*~uJrR  
  if(hHook!=NULL) `~CQU  
   nHookCount++; U2s /2 [.  
  return (hHook!=NULL); `XEr(e9  
} =h73s0 ]  
BOOL UnInit() Y#$%iF  
{ o"R7,N0rB  
 if(nHookCount>1){ j Dv{/ )  
  nHookCount--; )iK6:s #  
  return TRUE; v^iL5y!  
 } 2Ny"O.0h  
 BOOL unhooked = UnhookWindowsHookEx(hHook); #d2.\X}A"3  
 if(unhooked==TRUE){ xLH)P<^`C  
  nHookCount=0; L"*/:$EJL.  
  hHook=NULL; 2n"V}p>8i#  
 } O2dW6bt  
 return unhooked; VUR|OV%  
} GKc`xIQ  
-"60d @.  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) >{J(>B\  
{ Oh6fj}eK  
 BOOL bAdded=FALSE; t$#jL5  
 for(int index=0;index<MAX_KEY;index++){ 56-dD5{hxR  
  if(hCallWnd[index]==0){ +8Ymw:D7a  
   hCallWnd[index]=hWnd; s 3f-7f<  
   HotKey[index]=cKey; +8d1|cB"  
   HotKeyMask[index]=cMask; @;?p&.W`D  
   bAdded=TRUE; oij}'|/Jc  
   KeyCount++; .j<]mUY  
   break; ktBj|-'>  
  } MC:@U~}6  
 } [o+q>|q  
 return bAdded; UH-*(MfB  
} 8=uu8-l8g  
.-oxb,/  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) nWYN Np?h  
{ e:n<EnT  
 BOOL bRemoved=FALSE; X1-'COQS%&  
 for(int index=0;index<MAX_KEY;index++){ Jx7C'~,J  
  if(hCallWnd[index]==hWnd){ 6'G6<8 >-  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ e MY<uqdw  
    hCallWnd[index]=NULL; 2:7zG "$  
    HotKey[index]=0; (UvM@]B  
    HotKeyMask[index]=0; sjwo/+2  
    bRemoved=TRUE; MWpQ^dL_  
    KeyCount--; Q1 $^v0-)  
    break; KZ ;k)O.Ov  
   } |G,tlchprs  
  } y8!4q  
 } se>8Z4  
 return bRemoved; i}mVQ\j5  
} dP<=BcH>f  
kJzoFFWo$  
void VerifyWindow() ]X5 9  
{ nv%rJy*w[  
 for(int i=0;i<MAX_KEY;i++){ evAMJ=  
  if(hCallWnd!=NULL){ 6dN7_v)  
   if(!IsWindow(hCallWnd)){ MmnOHN@.  
    hCallWnd=NULL; rrqR}}l  
    HotKey=0; ]?+p5;{y4  
    HotKeyMask=0; o9%)D<4M  
    KeyCount--; X=!^] 3zH  
   } Vp*KfS]  
  } )d1_Wm#B  
 } 8I8 F/47x  
} _w/EP  
YoZFwRQU  
BOOL CHookApp::InitInstance() (k) l= ]`}  
{ ;":zkb{  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); =Ja]T~0A  
 hins=AfxGetInstanceHandle(); ! OM P]  
 InitHotkey(); 8{mQmG4  
 return CWinApp::InitInstance(); L&C<-BA/  
} Lk%u(duU^  
?dWfupO{  
int CHookApp::ExitInstance() ]6W;~w%  
{ $!+t2P@d.5  
 VerifyWindow(); <tT*.nM\  
 UnInit(); |sM#nhxK  
 return CWinApp::ExitInstance(); Gi<ik~  
} lZ.x@hDS  
I7ZY9W(S  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file jw?/@(AC6  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) kngkG|du  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ \`}Rdr!p%  
#if _MSC_VER > 1000 U']DB h  
#pragma once 8VQJUwf;  
#endif // _MSC_VER > 1000 /.9j$iK#  
S9S8T+  
class CCaptureDlg : public CDialog mYJ%gdTpo  
{ -'BC*fVr  
 // Construction [g`9C!P-G  
 public: ~B;kFdcVXn  
  BOOL bTray; 6*8"?S'  
  BOOL bRegistered; `[3Iz$K=  
  BOOL RegisterHotkey(); @GDe{GG+  
  UCHAR cKey; 8!2NZOZOS  
  UCHAR cMask; u&yAMWl  
  void DeleteIcon(); 2a8ZU{wjn  
  void AddIcon(); 4+e9:r]  
  UINT nCount; f4YcZyBGv  
  void SaveBmp(); [y-0w.V=oE  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor XdE#l/#  
  // Dialog Data " 2A`M~  
  //{{AFX_DATA(CCaptureDlg) xS?[v&"2  
  enum { IDD = IDD_CAPTURE_DIALOG }; RAYDl=}  
  CComboBox m_Key; rOQ@(aUAZ  
  BOOL m_bControl;  Aq674   
  BOOL m_bAlt; H&\[iZ| -N  
  BOOL m_bShift; 1Z%^U ?  
  CString m_Path; #$7d1bx  
  CString m_Number; q}P< Ejq}  
  //}}AFX_DATA DuX7  
  // ClassWizard generated virtual function overrides T9w;4XF  
  //{{AFX_VIRTUAL(CCaptureDlg) y|X</3w  
 public: C^9G \s'  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 6-#<*Pg  
 protected: d S]TTU1  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support hG51jVYtw  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ?# ~3%$>  
  //}}AFX_VIRTUAL g(Q)fw  
  // Implementation dd1CuOd6(1  
 protected: Y~z3fd  
  HICON m_hIcon; |R[@u=7s  
  // Generated message map functions +e VWTRG  
  //{{AFX_MSG(CCaptureDlg) wJ#fmQXKJ5  
  virtual BOOL OnInitDialog(); u&{}hv&FY  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); s zBlyT  
  afx_msg void OnPaint(); p1~u5BE7O  
  afx_msg HCURSOR OnQueryDragIcon(); tg =ClZ-  
  virtual void OnCancel(); 'YQ^K`lV  
  afx_msg void OnAbout(); LpRl!\FY$  
  afx_msg void OnBrowse(); NqyKR&;  
  afx_msg void OnChange(); ,36AR|IO)  
 //}}AFX_MSG me-Tv7WL  
 DECLARE_MESSAGE_MAP() R\DdU-k  
}; .quui\I3  
#endif ;Q*=AW  
7G6XK   
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file WRa1VU&f  
#include "stdafx.h" #?=?<"*j  
#include "Capture.h" 8{DZew /  
#include "CaptureDlg.h" EFpV  
#include <windowsx.h> %C8p!)Hu  
#pragma comment(lib,"hook.lib") aC$-riP,?'  
#ifdef _DEBUG kp F")0qr  
#define new DEBUG_NEW a^:on?:9  
#undef THIS_FILE 3B*b d  
static char THIS_FILE[] = __FILE__; 4wLN#dpeEy  
#endif o8<0#W@S  
#define IDM_SHELL WM_USER+1 w5/`_m!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^(}D  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Vo1,{"k  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; M$Sq3m`{!  
class CAboutDlg : public CDialog RbOEXH*]  
{ "&$ [@c  
 public: !4;A"B(  
  CAboutDlg(); #kGgz O  
  // Dialog Data [D;wB|+,  
  //{{AFX_DATA(CAboutDlg) 5(9SIj^O  
  enum { IDD = IDD_ABOUTBOX }; qKt*<KGeY  
  //}}AFX_DATA 2EO WbN}M  
  // ClassWizard generated virtual function overrides 4o/}KUu(*  
  //{{AFX_VIRTUAL(CAboutDlg) @*Y"[\"$  
 protected: nK!yu?mS  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support dUt$kB  
  //}}AFX_VIRTUAL gu1:%raXd  
  // Implementation I, 7~D!4G  
 protected: Q:L^DZkGV  
  //{{AFX_MSG(CAboutDlg) B=ckRW q  
  //}}AFX_MSG cd&^ vQL8  
  DECLARE_MESSAGE_MAP() u& 4i=K'x8  
}; EN,PI~~F  
E O.Se9ux  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 7LFJi@*8  
{ j\I{pW-  
 //{{AFX_DATA_INIT(CAboutDlg) E =*82Y=B  
 //}}AFX_DATA_INIT Q>ZxJ!B<k  
} RZY[DoF8u  
f6of8BOg  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Ru&>8Ln0  
{ DPWt=IFU  
 CDialog::DoDataExchange(pDX); m{v*\e7 P  
 //{{AFX_DATA_MAP(CAboutDlg) .8 GX8[t  
 //}}AFX_DATA_MAP Ri   
} ]2_b_ok  
Za110oF  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) >P<8E2}*  
 //{{AFX_MSG_MAP(CAboutDlg) VYR<x QA  
 // No message handlers hR4\:s+[  
 //}}AFX_MSG_MAP aAbK{=/y_!  
END_MESSAGE_MAP() }OsAO  
ShIJ6LZ  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ]Pp}=hcD  
: CDialog(CCaptureDlg::IDD, pParent) _Xqa_6+/  
{ 1u~CNHm  
 //{{AFX_DATA_INIT(CCaptureDlg) 69"4/n7B?  
  m_bControl = FALSE; 3LkcK1x.  
  m_bAlt = FALSE; o*t4zF&n  
  m_bShift = FALSE; im&Nkk4n@  
  m_Path = _T("c:\\"); QM) ob  
  m_Number = _T("0 picture captured."); mx!EuF$I  
  nCount=0; '% if< /  
  bRegistered=FALSE; ~Fe$/*v  
  bTray=FALSE; n~Yr`5+Z  
 //}}AFX_DATA_INIT %TeH#%[g>\  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 W%wc@.P  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); *-';ycOvr  
} !{+a2wi  
9*2Q'z}_  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Y2TXWl,Jk  
{ Yh["IhjR  
 CDialog::DoDataExchange(pDX); @$|8zPs  
 //{{AFX_DATA_MAP(CCaptureDlg) ( }RJW:  
  DDX_Control(pDX, IDC_KEY, m_Key); 4M )oA|1w  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); B fu/w   
  DDX_Check(pDX, IDC_ALT, m_bAlt); RI3GAd  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); <'N~|B/yZ  
  DDX_Text(pDX, IDC_PATH, m_Path); !"LFeqI$lr  
  DDX_Text(pDX, IDC_NUMBER, m_Number); D=jtXQF  
 //}}AFX_DATA_MAP |Kq<}R  
} ?dy t!>C  
$Xr4=9(|7  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) WjsmLb:5  
//{{AFX_MSG_MAP(CCaptureDlg) 5|A"YzY#  
 ON_WM_SYSCOMMAND() emMk*l,  
 ON_WM_PAINT() GD1L6kVd1  
 ON_WM_QUERYDRAGICON() `$Y%c1;  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) H-qbgd6&>R  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 1l s8h  
 ON_BN_CLICKED(ID_CHANGE, OnChange) j 6dlAe  
//}}AFX_MSG_MAP JYR^k=  
END_MESSAGE_MAP() c{3P|O&.  
%uQOAe55  
BOOL CCaptureDlg::OnInitDialog() n h&[e  
{ YGsg0I't  
 CDialog::OnInitDialog(); mXJ`t5v^l  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); %Y-KjSs+l  
 ASSERT(IDM_ABOUTBOX < 0xF000); ^CfWLL& c  
 CMenu* pSysMenu = GetSystemMenu(FALSE); :P?zy|aBi  
 if (pSysMenu != NULL) l % 0c{E~  
 { 5XF&yYWq  
  CString strAboutMenu; 9|x{z  
  strAboutMenu.LoadString(IDS_ABOUTBOX); "YoFUfaNg  
  if (!strAboutMenu.IsEmpty()) }:1*@7eR  
  { ['DYP-1J  
   pSysMenu->AppendMenu(MF_SEPARATOR); `^'0__<M  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); vhz Q.>  
  } CQh6;[\:  
 } ueu=$.^;g  
 SetIcon(m_hIcon, TRUE); // Set big icon 5D<"kT  
 SetIcon(m_hIcon, FALSE); // Set small icon 4cZlQ3OE.  
 m_Key.SetCurSel(0); oA`G\Xh_E  
 RegisterHotkey(); iXD=_^^o .  
 CMenu* pMenu=GetSystemMenu(FALSE); ~=/.ZUQNX  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 1( vcM  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 3}x6IM 2  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); s&D>'J  
 return TRUE; // return TRUE unless you set the focus to a control qLk7C0  
} 6(-c$d`C.0  
C sx EN4  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) x>[f+Tc  
{ , %$Cfu  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) |v@ zyOq&b  
 { }ZkGH}K_}  
  CAboutDlg dlgAbout; Q'c[yu  
  dlgAbout.DoModal(); TykY>cl   
 } tW=oAy  
 else G^A}T3  
 { UmOK7SPi  
  CDialog::OnSysCommand(nID, lParam); Bt(U,nFB  
 } 0*50uK=5  
} mL3 Q  
L]3gHq  
void CCaptureDlg::OnPaint() Qo])A6$IU  
{ 9B2`FJ  
 if (IsIconic()) &U{"dJr  
 { MUR Hv3  
  CPaintDC dc(this); // device context for painting ;-d2~1$  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); F?hGt]o  
  // Center icon in client rectangle zD): yEc  
  int cxIcon = GetSystemMetrics(SM_CXICON); b*dEX%H8sf  
  int cyIcon = GetSystemMetrics(SM_CYICON); Rkh ^|_<!  
  CRect rect; cPg$*,]  
  GetClientRect(&rect); m}GEx)Y D  
  int x = (rect.Width() - cxIcon + 1) / 2; {!37w[s~  
  int y = (rect.Height() - cyIcon + 1) / 2; U'Fc\M5l/l  
  // Draw the icon "j%L*J)  
  dc.DrawIcon(x, y, m_hIcon); A}z1~Z+  
 } 28=L9q   
 else 4KZ)`KPE  
 { GdtR  /1  
  CDialog::OnPaint(); QIu!o,B  
 } nCPIpw,]M  
} 2hF j+Ay  
P(Z\y^S  
HCURSOR CCaptureDlg::OnQueryDragIcon() A]AM|2 D  
{ THHA~;00YN  
 return (HCURSOR) m_hIcon; ZA8FX  
} B6"pw0  
O*-sSf   
void CCaptureDlg::OnCancel() <PTi>C8;r  
{ .p /VRlLU  
 if(bTray) hsHtLH+@  
  DeleteIcon(); g0"KC X  
  CDialog::OnCancel(); vp..>BMJ  
} Cswa5 l`af  
>TddKR @C  
void CCaptureDlg::OnAbout() i*ji   
{ _~_6qTv-d  
 CAboutDlg dlg; kJ:zMVN  
 dlg.DoModal(); C! J6"j  
} \|q.M0  
:R9 DJh\  
void CCaptureDlg::OnBrowse() uq_h8JH$  
{ %QKRl 5RM-  
 CString str; jj*e.t:F  
 BROWSEINFO bi; NJTC+`Hm  
 char name[MAX_PATH]; vV+>JM6<K  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); {;j@-=pV  
 bi.hwndOwner=GetSafeHwnd(); \J?5K l[*c  
 bi.pszDisplayName=name; 1q(o3%   
 bi.lpszTitle="Select folder"; 'g8~539{&  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; SeBbI&Ju  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); XB-pOtVm  
 if(idl==NULL) 2As 4}  
  return; *plsZ*Q8  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); | QJ!5nb  
 str.ReleaseBuffer(); ~wIVw}  
 m_Path=str; iLn)Z0<\o  
 if(str.GetAt(str.GetLength()-1)!='\\') dRyK'Xr  
  m_Path+="\\"; OC9_EP\"  
 UpdateData(FALSE); w*r.QzCu,5  
} A"k6n\!n;  
GwV2`2  
void CCaptureDlg::SaveBmp() VcT(n7  
{ EXg\a#4['  
 CDC dc; :k075Zr/#D  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 3@?#4]D{'  
 CBitmap bm; Y4}!9x  
 int Width=GetSystemMetrics(SM_CXSCREEN); `f}c 1  
 int Height=GetSystemMetrics(SM_CYSCREEN); 'Zf_/ y  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Er Ji  
 CDC tdc; X^#48*"a  
 tdc.CreateCompatibleDC(&dc); ~Rk%M$E9  
 CBitmap*pOld=tdc.SelectObject(&bm); m,$oV?y>j  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); IP$^)t[  
 tdc.SelectObject(pOld); 4QdY"s( n  
 BITMAP btm; Z:09 ]r1  
 bm.GetBitmap(&btm); g/W<;o<v(I  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 7_d gQI3y  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); I)V2cOrXM  
 BITMAPINFOHEADER bih; |]HU$Gt S  
 bih.biBitCount=btm.bmBitsPixel; -]R7[5C:  
 bih.biClrImportant=0; eHi|_3A&*  
 bih.biClrUsed=0; Z&@X4X"q  
 bih.biCompression=0; Y.3]vno?X  
 bih.biHeight=btm.bmHeight; ^6mlE+WY  
 bih.biPlanes=1;  $.(%7[  
 bih.biSize=sizeof(BITMAPINFOHEADER); $:s1x\ol  
 bih.biSizeImage=size; ,<%Y.x%4z[  
 bih.biWidth=btm.bmWidth; |! i3Y=X  
 bih.biXPelsPerMeter=0; (!}N&!t  
 bih.biYPelsPerMeter=0; HMq}){=S  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); t!?`2Z5  
 static int filecount=0; n8,%<!F^  
 CString name; z9o]);dZ  
 name.Format("pict%04d.bmp",filecount++); `^)`J  
 name=m_Path+name; {<-s&%/r  
 BITMAPFILEHEADER bfh; Cd%5XD^  
 bfh.bfReserved1=bfh.bfReserved2=0; 9)!Ks g(h  
 bfh.bfType=((WORD)('M'<< 8)|'B'); c9|4[_&B~  
 bfh.bfSize=54+size; q%3VcR$J  
 bfh.bfOffBits=54; @yTu/U  
 CFile bf; /$; Z ~^P  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ j7P49{  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ~>:JwTy  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 392V\qtS  
  bf.WriteHuge(lpData,size); 7ZUN;mr  
  bf.Close(); {\$S585  
  nCount++; Ab$E@H #  
 } stw@@GQ  
 GlobalFreePtr(lpData); voZaJ2ho/O  
 if(nCount==1) r]e{~v/  
  m_Number.Format("%d picture captured.",nCount); `gl?y;xC  
 else ~A0AB `7  
  m_Number.Format("%d pictures captured.",nCount); "@x( 2(Y&  
  UpdateData(FALSE); `q}D#0  
} r6S  
dX?j /M-  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) e{8C0=  
{ ]D6<6OB  
 if(pMsg -> message == WM_KEYDOWN) rVabkwYD  
 {  U#f*  
  if(pMsg -> wParam == VK_ESCAPE) L`t786 (M  
   return TRUE; lr&2,p<  
  if(pMsg -> wParam == VK_RETURN) tN{0C/B9  
   return TRUE; ca=MUm=B  
 } ]Jz=. F sO  
 return CDialog::PreTranslateMessage(pMsg); [)`*k#.=  
} T#&1q]P1F  
k2Q[v  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) C5=^cH8  
{ Qe~C}j%  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ I85wP}c(  
  SaveBmp(); >uCO=T,|  
  return FALSE; 5]{rim  
} Z@q1&}D!  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ r%: :q^b3  
 CMenu pop; DvWBvs,  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); jzi%[c<G  
 CMenu*pMenu=pop.GetSubMenu(0); +^:uPW^U  
 pMenu->SetDefaultItem(ID_EXITICON); T #E{d  
 CPoint pt; "4XjABJ4'  
 GetCursorPos(&pt); @kd$.7Y9  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ?r;F'%N=  
 if(id==ID_EXITICON) 8Ogg(uS70'  
  DeleteIcon(); kU:Q&[/jzH  
 else if(id==ID_EXIT) DI{Qs[  
  OnCancel(); j\#)'>"  
 return FALSE; !le#7Kii  
} +)9=bB  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ZrYRLg  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) d3oRan}z  
 AddIcon(); 9 Eh*r@>  
 return res; x>i =  
} l2#~   
1% @i4  
void CCaptureDlg::AddIcon() !7jVKI80  
{ _Sn45h@"  
 NOTIFYICONDATA data; WC`x^HI  
 data.cbSize=sizeof(NOTIFYICONDATA); zHk7!|%Y  
 CString tip; QBL|n+  
 tip.LoadString(IDS_ICONTIP); jC_m0Iwc  
 data.hIcon=GetIcon(0); D) ;w)`  
 data.hWnd=GetSafeHwnd(); vbSycZ2M7  
 strcpy(data.szTip,tip); OGAC[s~V  
 data.uCallbackMessage=IDM_SHELL; G'f5MP 1  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; feG#*m2g  
 data.uID=98; !FHm.E_>  
 Shell_NotifyIcon(NIM_ADD,&data); u @#fOu  
 ShowWindow(SW_HIDE); C5x*t Q|  
 bTray=TRUE; ^F:Bj&0v[  
} W+u-M>Cj6  
D'<'"kUd  
void CCaptureDlg::DeleteIcon() =U,mzY (  
{ $ uqB.f$  
 NOTIFYICONDATA data; eH^~r{{R  
 data.cbSize=sizeof(NOTIFYICONDATA); }B@44HdY  
 data.hWnd=GetSafeHwnd(); (fcJp)D  
 data.uID=98; ^j]_MiA4  
 Shell_NotifyIcon(NIM_DELETE,&data); B\Uocn  
 ShowWindow(SW_SHOW); ==Xy'n9'  
 SetForegroundWindow(); U8J9 #+:  
 ShowWindow(SW_SHOWNORMAL); at4JLbk  
 bTray=FALSE; {* P[dyu  
} ~(8fUob  
HNCu:$Wr@  
void CCaptureDlg::OnChange() KJ:z\N8eo  
{ n_Qua|R  
 RegisterHotkey(); 6 Ia HaV+P  
} M[~{!0Uz g  
_VVq&t}  
BOOL CCaptureDlg::RegisterHotkey() {@F'BB\  
{ Il Qk W<  
 UpdateData(); zjh:jrv~  
 UCHAR mask=0; ,SidY\FzH  
 UCHAR key=0; I;-Y2*  
 if(m_bControl) #/o~h|g  
  mask|=4; o$eCd{HuX  
 if(m_bAlt) #4./>}G  
  mask|=2; qdn_ ZE  
 if(m_bShift) YoW)]n  
  mask|=1; g'b|[ q  
  key=Key_Table[m_Key.GetCurSel()]; }Nd1'BVf  
 if(bRegistered){ R?{xs  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); "[!b5f3!I  
  bRegistered=FALSE; tcT =a@  
 } Z|Oq7wzEH  
 cMask=mask; CgmAxcK  
 cKey=key; 5a'`%b{{  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); n1{[CCee@  
 return bRegistered; ,h*N9}xYTi  
} =\|,hg)c  
7P<f(@0h$E  
  四、小结 c8YbBdk'  
sYBmL]Hr  
  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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