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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: nH|,T%  
  bzN-*3YE=  
  一、实现方法 w|[RDaAb  
^].jH+7i*  
  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: S=`+Ryc  
sP@X g;]  
#pragma data_seg("shareddata") b5G}3)'w  
HHOOK hHook =NULL; //钩子句柄 6 K` c/)  
UINT nHookCount =0; //挂接的程序数目 h}`!(K^;3  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 JAjmrX  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 'XrRhF (  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey H( jXI  
static int KeyCount =0; 4mjgt<`  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Y-mK+1 2  
#pragma data_seg() {c?JuV4q?  
lbdTQ6R  
  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。 H9)m^ *  
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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:  p?D2)(  
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BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR $2^`Uca  
cKey,UCHAR cMask) F>je4S;  
{ |{r$jZeE  
 BOOL bAdded=FALSE; j%u-dr  
 for(int index=0;index<MAX_KEY;index++){ 51C2u)HE  
  if(hCallWnd[index]==0){ `:m!~  
   hCallWnd[index]=hWnd; '_\;jFAM  
   HotKey[index]=cKey; 6qWdd&1  
   HotKeyMask[index]=cMask; \c v?^AI  
   bAdded=TRUE; 2&'|Eqk  
   KeyCount++; 7uorQfR?  
   break; |BT MJ:B  
  } =]`lN-rYw  
 } u]-_<YZ'B  
 return bAdded; 1n5(S<T  
} 2aw&YZ&Xo  
//删除热键 #`TgZKDg2  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) TGXa,A{  
{ =<r8fXWZ  
 BOOL bRemoved=FALSE; g]c[O*NTL  
 for(int index=0;index<MAX_KEY;index++){ |Xi%   
  if(hCallWnd[index]==hWnd){ u 's`*T@.  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 3A:q7#m  
    hCallWnd[index]=NULL; Wz4&7KYY  
    HotKey[index]=0; zya5Jb:Sg  
    HotKeyMask[index]=0; \Ng\B.IQ  
    bRemoved=TRUE; 3f " %G\  
    KeyCount--; vK7\JZ>  
    break; UJfT!==U  
   } >d"3<S ; b  
  } n\Fp[9+Z\  
 } 7!,YNy%  
 return bRemoved; Aa0b6?Jm  
} wbDM5%  
hz;|NW{u  
Z/x*Y#0@n  
  DLL中的钩子函数如下: f<=Fsl  
;*ix~taL%  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) '7wd$rl  
{ \!IMaB]  
 BOOL bProcessed=FALSE; 2sNK  
 if(HC_ACTION==nCode) LMi:%i%\  
 { >Rvx[`|O!m  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 g4`Kp; }&'  
   switch(wParam) |(m oWY=  
   {  IK,|5]*Ar  
    case VK_MENU: D|Iur W1f  
     MaskBits&=~ALTBIT; gqXS~K9t  
     break; 6S6f\gAM  
    case VK_CONTROL: j'[m:/  
     MaskBits&=~CTRLBIT; `Y-|H;z  
     break; 7n]65].t  
    case VK_SHIFT: I;5R2" 3  
     MaskBits&=~SHIFTBIT; 8[r9HC  
     break; )jWO P,|  
    default: //judge the key and send message (,^*So/  
     break; >hBxY]< \  
   } r`)L ~/  
   for(int index=0;index<MAX_KEY;index++){ qq)0yyL r  
    if(hCallWnd[index]==NULL) '(? uPr  
     continue; EbeI{ -'aF  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ?USQlnr:R/  
    { G}5#l  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); q$1PG+-  
     bProcessed=TRUE; s yU9O&<  
    } 1@u2im-O  
   } ~GE$myUT\p  
  } A:(*y 2  
  else if((lParam&0xc000ffff)==1){ //有键按下 7+x? " 4  
   switch(wParam) R52I= a5,*  
   { l3N I$Z u  
    case VK_MENU: 3=-4%%[M@  
     MaskBits|=ALTBIT; *[=bR>  
     break; .2J L$"  
    case VK_CONTROL: G:x*BH+  
     MaskBits|=CTRLBIT; e><5Pr)  
     break; ~|wbP6</:-  
    case VK_SHIFT: # :T-hRu  
     MaskBits|=SHIFTBIT; hOhS)  
     break; Kwc6mlw~M  
    default: //judge the key and send message VqL.iZ-  
     break; cA6lge<{~  
   } XeBP`\>Ve  
   for(int index=0;index<MAX_KEY;index++){ x0 d~i!d  
    if(hCallWnd[index]==NULL) 9qS"uj  
     continue; cRX~z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) lL]y~u  
    { }j,[ 1@S  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); L[5=h  
     bProcessed=TRUE; jxJv.  
    } }|%eCVB  
   } L 8{\r$  
  } P/&]?f0/  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 CK, 6ytB  
   for(int index=0;index<MAX_KEY;index++){ {'16:dTJ  
    if(hCallWnd[index]==NULL) '!f5?O+E  
     continue; 1-.~7yC  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) r J KZ)N{  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); zhY+x<-  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 *T0q|P~o%  
   } /?'; nGq  
  } 'zh7_%  
 } ]kG(G%r|M  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); s,a}?W  
} yV)la@c  
DcSnia62f  
  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: ?5kHa_^  
OFje+S  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1Bxmm#  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ?eV4 SH  
+a^F\8H  
  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: Zo>]rKeV  
A.UUW  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) tGB@$UmfU  
{ U-n;xX0=  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) AyMd:5;  
 { ccd8O{G.M  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 /c):}PJ^#7  
  SaveBmp(); 4 Jx"A\5*G  
  return FALSE; G\NPV'  
 }  *.)tG  
 …… //其它处理及默认处理 9W5onn  
} t43)F9!  
!bV5Sr^  
]({~,8s  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 43V}# DA@  
VY)s+Bx  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 2Pc%fuC  
.$@R{>%U  
  二、编程步骤 86 W0rS[5  
IHRGw  
  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"; kA7mLrON  
IKie1!ZU{"  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; cyJG8f  
}^B6yWUN  
  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; 9)VF 1LD  
-GLMmZJt  
  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; pKi&[  
1#1 riM -  
  5、 添加代码,编译运行程序。 )?wJF<[_#  
ZoArQ(YFy  
三、程序代码 sUE?v9  
@?"h !fyu  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL KN-avu_Ix  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ~)(\6^&=|  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ vOg#Dqn-  
#if _MSC_VER > 1000 ,]T2$?|  
#pragma once "Ky; a?Y  
#endif // _MSC_VER > 1000 h,"4SSL  
#ifndef __AFXWIN_H__ 1{P'7IEj  
#error include 'stdafx.h' before including this file for PCH tnLAJ+ -M  
#endif GRY2?'`  
#include "resource.h" // main symbols $ /nY5[  
class CHookApp : public CWinApp 9uWY@zu  
{ /> 4"~q)  
 public: vB+ '  
  CHookApp(); Zdn~`Q{  
  // Overrides Ao/ jt<  
  // ClassWizard generated virtual function overrides |g *XK6  
  //{{AFX_VIRTUAL(CHookApp) ;qBu4'C)T  
 public: 4 {9B9={  
  virtual BOOL InitInstance(); awz;z?~  
  virtual int ExitInstance(); .H,xle  
  //}}AFX_VIRTUAL bu51$s?B  
  //{{AFX_MSG(CHookApp) V\6]n2  
  // NOTE - the ClassWizard will add and remove member functions here. $v Z$'(  
  // DO NOT EDIT what you see in these blocks of generated code ! m>SErxU(z  
  //}}AFX_MSG IIyI=Wl pG  
  DECLARE_MESSAGE_MAP() &?h,7 D;A  
}; a@R]X5[O  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); xZV1k~C  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); u_rdmyq$x/  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); P\_`   
BOOL InitHotkey(); V <bd;m  
BOOL UnInit(); Q?X>E3=U  
#endif @$T 9Ll  
uw2hMt (N  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. D.mHIsX6\  
#include "stdafx.h" /JT#^Y  
#include "hook.h" >a}f{\Q  
#include <windowsx.h> @/ k@WhFZ  
#ifdef _DEBUG Onwp-!!.  
#define new DEBUG_NEW  @Pt="*g  
#undef THIS_FILE GH[wv<  
static char THIS_FILE[] = __FILE__; ~}<DG1!  
#endif hqRw^2F  
#define MAX_KEY 100 6"}?.E$  
#define CTRLBIT 0x04 -I=l8m6L  
#define ALTBIT 0x02 !>1@HH?I\/  
#define SHIFTBIT 0x01 E4hLtc^ +  
#pragma data_seg("shareddata") y{N-+10z  
HHOOK hHook =NULL; q&d~ \{J  
UINT nHookCount =0; |7zd%!  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey nMJ#<'v^!2  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT P+$:(I  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey QcpXn4/*  
static int KeyCount =0; l<);s  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift A,4fEmWM  
#pragma data_seg() p}cw{  
HINSTANCE hins; y '!m4-  
void VerifyWindow(); .?l\g-;=  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 8Ac:_Zg  
//{{AFX_MSG_MAP(CHookApp) sM9+dh  
// NOTE - the ClassWizard will add and remove mapping macros here. ^`G}gWBx}w  
// DO NOT EDIT what you see in these blocks of generated code! f;b[w   
//}}AFX_MSG_MAP ,N0#!<}4  
END_MESSAGE_MAP() /i77  
tPF.r  
CHookApp::CHookApp() g1( IR)U!z  
{ ? YG)I;(  
 // TODO: add construction code here, o]opdw  
 // Place all significant initialization in InitInstance rEF0oJ.  
} #_u~/jhX  
Hhh0T>gi  
CHookApp theApp; KY~- ;0x  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) BT(CM,bp  
{ rOVVL%@QqJ  
 BOOL bProcessed=FALSE; w`5xrqt@  
 if(HC_ACTION==nCode) Ih"XV  
 { Sm5H_m!  
  if((lParam&0xc0000000)==0xc0000000){// Key up ' MxrQ;|S  
   switch(wParam) ,S!azN=  
   { O6OP =K!t:  
    case VK_MENU: F|!){=   
     MaskBits&=~ALTBIT; VX1-JxY  
     break; \P6$mh\T  
    case VK_CONTROL: 15sp|$&`  
     MaskBits&=~CTRLBIT; /~<@*-'  
     break; |)*fRL,  
    case VK_SHIFT: cMOyo<F#^=  
     MaskBits&=~SHIFTBIT; LSRk7'0  
     break; Z+=@<i''  
    default: //judge the key and send message 5@BBo eG  
     break; {lc\,F*$  
   } <.? jc%  
   for(int index=0;index<MAX_KEY;index++){ q*>&^V$M  
    if(hCallWnd[index]==NULL) RVQh2'w  
     continue; &e!7Z40w@&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) FIsyiSY<j  
    { kbe-1 <72  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); {Ja!~N;3  
     bProcessed=TRUE; \QCJ4}\CS  
    } Dbz3;t  
   } ^t#&@-'(d  
  } aSnF KB  
  else if((lParam&0xc000ffff)==1){ //Key down eYvWZJa4  
   switch(wParam) @ rc{SB  
   { %B.yW`,X  
    case VK_MENU: HKUn`ng  
     MaskBits|=ALTBIT; b"{'T]"*j  
     break; (P:<t6;+  
    case VK_CONTROL: #n8IZ3+  
     MaskBits|=CTRLBIT; &*aIEa^  
     break; w}YlVete  
    case VK_SHIFT: Nb'''W-iu  
     MaskBits|=SHIFTBIT; V]db'qB\  
     break; av|g}xnj  
    default: //judge the key and send message ?snp8W-WB  
     break; \}|o1Xh2  
   } Sxh]R+Xb  
   for(int index=0;index<MAX_KEY;index++) |0f>aZ  
   { r<d_[?1N  
    if(hCallWnd[index]==NULL) jIyB  
     continue; mUik A9u5=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) "L&#lfOKG  
    { P`cq H(   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ?BZPwGMs  
     bProcessed=TRUE; I<6P;  
    } j=r P:#  
   } @pRlxkvV  
  } tu66'z  
  if(!bProcessed){ *(T:,PY  
   for(int index=0;index<MAX_KEY;index++){ /$p6'1P8  
    if(hCallWnd[index]==NULL) dx@-/^.  
     continue; m()RU"WY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 2HsLc*9{4  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); (bH`x]h#  
   } gq'Y!BBQy  
  } #ZrHsf P  
 } HK0! P*  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); YOmM=X+'H  
} SSWP~ t  
:x4|X8>  
BOOL InitHotkey() wMg0>  
{ 8b;1F Q'  
 if(hHook!=NULL){ f@|A[>"V  
  nHookCount++; 6"&6 `f  
  return TRUE; "ozr+:#\  
 } c2'Lfgx4  
 else &keR~~/  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); eEv@}1~  
  if(hHook!=NULL) M:[ %[+6  
   nHookCount++; I7n"&{s"*  
  return (hHook!=NULL); naR0@Q"\h  
} +{f:cea (1  
BOOL UnInit() \=ux atw  
{ (G;l x  
 if(nHookCount>1){ =k^Y?.  
  nHookCount--; p o2!  
  return TRUE; UMm!B`M  
 } biU^[g("  
 BOOL unhooked = UnhookWindowsHookEx(hHook); r\-uJ~8N  
 if(unhooked==TRUE){ b((M)Gz  
  nHookCount=0; {CGUL|y  
  hHook=NULL; 2Ay* kmW  
 } tnN.:%mZ  
 return unhooked; >\P@^ h]  
} wc}5m Hs  
E%,^Yvh/  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !W}9no  
{ "AsKlKz{B  
 BOOL bAdded=FALSE; eo?;`7  
 for(int index=0;index<MAX_KEY;index++){ o.!~8mD  
  if(hCallWnd[index]==0){ 'm FqE n  
   hCallWnd[index]=hWnd; qh|_W(`y  
   HotKey[index]=cKey; xRzFlay8  
   HotKeyMask[index]=cMask; 1q:2\d]  
   bAdded=TRUE; jZ~n[ f+Q  
   KeyCount++; 2q=AEv/  
   break; PGhY>$q>b  
  } <oT^A|JFj  
 } aJbO((%$|u  
 return bAdded; q$Zh@  
} xSsa(b  
- -HZX  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) AQ,' 6F9  
{ '$ =>  
 BOOL bRemoved=FALSE; Mh:L$f0A%O  
 for(int index=0;index<MAX_KEY;index++){ l3Q(TH~I  
  if(hCallWnd[index]==hWnd){ #*K}IBz  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ t4zkt!`B  
    hCallWnd[index]=NULL; 9=8iy w  
    HotKey[index]=0; lhAX;s&9  
    HotKeyMask[index]=0; t\~P:"  
    bRemoved=TRUE; |y!=J$ $_H  
    KeyCount--; (a.z9nqGA  
    break; w[zjerH3  
   } =hC,@R>;  
  } 93("oBd[s(  
 } 1{ ~#H<K  
 return bRemoved; p.v0D:@&  
} QkEvw<  
`1$@|FgyC  
void VerifyWindow() "55skmD.P  
{ RI 5yF  
 for(int i=0;i<MAX_KEY;i++){ =[cS0Sy  
  if(hCallWnd!=NULL){ (|:M&Cna]  
   if(!IsWindow(hCallWnd)){ vNV/eB8#S  
    hCallWnd=NULL; pfA|I*`XV  
    HotKey=0; v &Yi  
    HotKeyMask=0; Ai=s e2  
    KeyCount--; Pq;U &,  
   } )wam8k5  
  } fTS5 yb%  
 }  *'.|9W  
} `scR*]f1+  
q<[P6}.  
BOOL CHookApp::InitInstance() zZPuha8  
{ e6R}0w~G  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); _~IR6dKE  
 hins=AfxGetInstanceHandle(); X0bN3N  
 InitHotkey(); R_W+Ylob  
 return CWinApp::InitInstance(); EUD~CZhS"k  
} , pDnRRJ!  
%p^wZtm  
int CHookApp::ExitInstance() 8=B|C'>  
{ M -cTRd-i  
 VerifyWindow(); ww\CQ6/h  
 UnInit(); vM*-D{  
 return CWinApp::ExitInstance(); h)ECf?r<  
} QR c{vUR&  
w28o}$b`  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ?26I,:;  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) A!s`[2 Z  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ jSh5!6O  
#if _MSC_VER > 1000 ddJQC|xR}  
#pragma once l2zFKCGF(  
#endif // _MSC_VER > 1000 @Owb?(6?  
cs,N <|  
class CCaptureDlg : public CDialog +%zAQeb  
{ >Wm `v.-  
 // Construction q8X feoUV  
 public: Y;dz,}re  
  BOOL bTray; 2iY3Lsna  
  BOOL bRegistered; [YRz*5   
  BOOL RegisterHotkey(); #|Y5,a ,{  
  UCHAR cKey; }iXDa?6%  
  UCHAR cMask; \\r)Ue]  
  void DeleteIcon(); B8.Pn  
  void AddIcon(); ] bM)t<  
  UINT nCount; 6}gls}[0{e  
  void SaveBmp(); 1L%CJ+Q#0i  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ocqU=^ta  
  // Dialog Data g`{;(/M+  
  //{{AFX_DATA(CCaptureDlg)  8{wwd:6  
  enum { IDD = IDD_CAPTURE_DIALOG }; 9oRy)_5Z(=  
  CComboBox m_Key; /[a~3^Gs^  
  BOOL m_bControl; Tzt8h\Q^z  
  BOOL m_bAlt; -[ *,^Ti`  
  BOOL m_bShift; SN9kFFIPb=  
  CString m_Path; m'Amli@[  
  CString m_Number; ''q@>  
  //}}AFX_DATA O,+1<.;+  
  // ClassWizard generated virtual function overrides $? m9")  
  //{{AFX_VIRTUAL(CCaptureDlg) rXmn7;B}g  
 public: 9oyE$S h]  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 04LI]'  
 protected: ]{)a,c NG  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support nF54tR[  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); WK ts[Z  
  //}}AFX_VIRTUAL bZnuNYty75  
  // Implementation mC4zactv  
 protected: e}D3d=6`  
  HICON m_hIcon; S@jQX  
  // Generated message map functions dbwe?ksh  
  //{{AFX_MSG(CCaptureDlg) ^!<U_;+  
  virtual BOOL OnInitDialog(); l7XUXbYp&=  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); !^^?dRd*v  
  afx_msg void OnPaint(); ;;_,~pI?k  
  afx_msg HCURSOR OnQueryDragIcon(); eV 2W{vuI  
  virtual void OnCancel(); #+:9T /*>0  
  afx_msg void OnAbout(); 8;d:-Cp  
  afx_msg void OnBrowse(); W3]_m8,Z  
  afx_msg void OnChange(); 8qk?E6  
 //}}AFX_MSG .GsV>H  
 DECLARE_MESSAGE_MAP() 6 bomh2  
}; X@$f$=  
#endif j2Cks_$:  
8|):`u  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 49rf7NT-g  
#include "stdafx.h" )_+rU|We  
#include "Capture.h" <>dT64R|  
#include "CaptureDlg.h" .R) D3NZp  
#include <windowsx.h>  |XT)QK1  
#pragma comment(lib,"hook.lib") D8inB+/-  
#ifdef _DEBUG KX76UW   
#define new DEBUG_NEW T m_bz&Q  
#undef THIS_FILE yWg@v +  
static char THIS_FILE[] = __FILE__; T_s _p  
#endif Y#!UPhg<  
#define IDM_SHELL WM_USER+1 4E; VM{  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); [="e ziM{  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); h hG4-HD  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; zO~8?jDN4|  
class CAboutDlg : public CDialog ]p _L)  
{ ta35 K"  
 public: DwaBdN[!7  
  CAboutDlg(); OglEt["  
  // Dialog Data n)L*  
  //{{AFX_DATA(CAboutDlg) aO]ZZleNS  
  enum { IDD = IDD_ABOUTBOX }; Z8# (kmBdB  
  //}}AFX_DATA 1e(E:_t  
  // ClassWizard generated virtual function overrides P?8GV%0$  
  //{{AFX_VIRTUAL(CAboutDlg) H;?{BV  
 protected: 1 9&<|qTz  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support j.C`U(n}`  
  //}}AFX_VIRTUAL :9O#ObFR  
  // Implementation {E p0TVj`  
 protected: A'j;\ `1  
  //{{AFX_MSG(CAboutDlg) ql<i]Y  
  //}}AFX_MSG cWEE%  
  DECLARE_MESSAGE_MAP() a;rdQ>  
}; Te.Y#lCT$  
>7wOoK|1'  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) |2?'9<  
{ QP@%(]fG  
 //{{AFX_DATA_INIT(CAboutDlg) ~c8? >oN(  
 //}}AFX_DATA_INIT @E^~$-J5j  
} ~;QvWS  
z8jk[5z  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 3[\iQ*d }B  
{ J{l1nHQZSu  
 CDialog::DoDataExchange(pDX); )hd@S9Z.Y  
 //{{AFX_DATA_MAP(CAboutDlg) VCu{&Sh*  
 //}}AFX_DATA_MAP e&simX;W  
} *v;!-F&8>  
c]$i\i#  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) qHsUP;7  
 //{{AFX_MSG_MAP(CAboutDlg) FYOD Upn  
 // No message handlers , `wXg  
 //}}AFX_MSG_MAP us ;YV<)d  
END_MESSAGE_MAP() y)F;zW<+  
_wC3kAO  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) <A<{,:5C  
: CDialog(CCaptureDlg::IDD, pParent) (hTCK8HK  
{ x4g3 rmp  
 //{{AFX_DATA_INIT(CCaptureDlg) NS9B[*"Jl  
  m_bControl = FALSE;  :l~ I  
  m_bAlt = FALSE; <:(6EKJAq}  
  m_bShift = FALSE; dA-2%uJ  
  m_Path = _T("c:\\"); nIAx2dh?  
  m_Number = _T("0 picture captured."); 8yRJD[/S  
  nCount=0; m$`RcwO  
  bRegistered=FALSE; 6Se?sHC>  
  bTray=FALSE; fXXr+Mor  
 //}}AFX_DATA_INIT ji1viv  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Mx6@$tQ%  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); /,1D)0  
} j Yx38_5e  
w3#Wh|LQ-  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ]p*l%(dhY  
{ A:>01ZJ5S+  
 CDialog::DoDataExchange(pDX); O>qll 6]{@  
 //{{AFX_DATA_MAP(CCaptureDlg) unshH<  
  DDX_Control(pDX, IDC_KEY, m_Key); #OBJzf*p  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); zw+B9PYqX  
  DDX_Check(pDX, IDC_ALT, m_bAlt); P#pn*L*"T  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ,%n\=  
  DDX_Text(pDX, IDC_PATH, m_Path); P6E3-?4j  
  DDX_Text(pDX, IDC_NUMBER, m_Number); @*}D$}aR'V  
 //}}AFX_DATA_MAP d1T,eJ}  
} vK 7^*qr;j  
cYFiJJLG]  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) if}-_E<F  
//{{AFX_MSG_MAP(CCaptureDlg) +IrLDsd  
 ON_WM_SYSCOMMAND() t]>Lh>G  
 ON_WM_PAINT() &?VQ,+[ <  
 ON_WM_QUERYDRAGICON() z|=}1; (.  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) kV?y0J.  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 9w"h  
 ON_BN_CLICKED(ID_CHANGE, OnChange) MA;1 ;uI,  
//}}AFX_MSG_MAP U2{ dN>  
END_MESSAGE_MAP() "Weg7mc#  
+hvO^?4j  
BOOL CCaptureDlg::OnInitDialog() `1'6bp`Z  
{ i\1TOP|h  
 CDialog::OnInitDialog(); T~QWRBO  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 9!T[Z/}T  
 ASSERT(IDM_ABOUTBOX < 0xF000); P6!jRC"52'  
 CMenu* pSysMenu = GetSystemMenu(FALSE); X'%E\/~u  
 if (pSysMenu != NULL) M9EfU  
 { Lk~ho?^`  
  CString strAboutMenu; OTC!wI g  
  strAboutMenu.LoadString(IDS_ABOUTBOX); K|Ld,bq  
  if (!strAboutMenu.IsEmpty()) pcau}5 .  
  { !g Z67  
   pSysMenu->AppendMenu(MF_SEPARATOR); thV>j9'  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); RMX:9aQ3F  
  } 6;C3RU]  
 } :q=%1~Idla  
 SetIcon(m_hIcon, TRUE); // Set big icon #~SP)Ukp  
 SetIcon(m_hIcon, FALSE); // Set small icon 1=#q5dZ]  
 m_Key.SetCurSel(0); /3;4#:Kkw  
 RegisterHotkey(); 7.C;NT  
 CMenu* pMenu=GetSystemMenu(FALSE); Xua+cVc\y  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); !vX D  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ^ s1Q*He  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); a-l; vDs  
 return TRUE; // return TRUE unless you set the focus to a control $"0MU  
} HOw -]JSP2  
K/A*<<r ~  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 8d?g]DEN)6  
{ "5;;)\o ~  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) @.G[s)x  
 { ~7Ts_:E-  
  CAboutDlg dlgAbout; ^[]}R:  
  dlgAbout.DoModal(); #Xhdn\7  
 } P/xKnm~  
 else R16'?,  
 { K#*reJ}K  
  CDialog::OnSysCommand(nID, lParam); !lEY=1nHOJ  
 } >wb 'QzF:  
} SGh1 DB  
[!}:KD2yX  
void CCaptureDlg::OnPaint() /TZOJE(2j  
{ Qi_>Mg`x  
 if (IsIconic()) r)Ap8?+  
 { j;s"q]"x]  
  CPaintDC dc(this); // device context for painting !6s"]WvF  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); b'J'F;zh>  
  // Center icon in client rectangle t=_J9|  
  int cxIcon = GetSystemMetrics(SM_CXICON); _7IKzUn9g[  
  int cyIcon = GetSystemMetrics(SM_CYICON); A/s>PhxV  
  CRect rect; M7+nW ; e%  
  GetClientRect(&rect); Ul2R'"FB  
  int x = (rect.Width() - cxIcon + 1) / 2; d*A*y^OD  
  int y = (rect.Height() - cyIcon + 1) / 2; ZZcEt  
  // Draw the icon Yu?95qktP  
  dc.DrawIcon(x, y, m_hIcon); <,3^|$c%  
 } %6L^2 X  
 else b8LoIY*  
 { fQL"O}Z  
  CDialog::OnPaint(); g0>,%b  
 } e?_@aa9~@{  
} WA]c=4S  
]Tkc-ez  
HCURSOR CCaptureDlg::OnQueryDragIcon() N-I5X2  
{ :!5IW?2  
 return (HCURSOR) m_hIcon; 5QPM t^  
} xqC+0{] y  
*.\  
void CCaptureDlg::OnCancel() ?shIj;c[  
{ |;.o8}  
 if(bTray) !PrwH;  
  DeleteIcon(); _@ *+~9%8p  
  CDialog::OnCancel(); wNQ*t-K  
} p3]_}Y D[#  
#+$G=pS'v  
void CCaptureDlg::OnAbout() ?*?RP)V  
{ S/Fkw4%  
 CAboutDlg dlg; dDm):Z*`b  
 dlg.DoModal(); 356>QW'm  
} Cl ^\OZN\=  
0{dz5gUde  
void CCaptureDlg::OnBrowse() #ggf' QIHp  
{ kqce[hgs<  
 CString str; (q{Ck#+  
 BROWSEINFO bi; LbaK={tR  
 char name[MAX_PATH]; ogL EtqT  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); cU{e`<xjA  
 bi.hwndOwner=GetSafeHwnd(); 7<%<Ff@^)O  
 bi.pszDisplayName=name; U f|> (C  
 bi.lpszTitle="Select folder"; .C2TQ:B,.  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; kGd<5vCs  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); fO0(Z  
 if(idl==NULL) F1jglH/MF)  
  return; +n<k)E@>J  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ]%BWIqbr  
 str.ReleaseBuffer(); dxZu2&gi  
 m_Path=str; Ix(?fO#uNF  
 if(str.GetAt(str.GetLength()-1)!='\\') Gm9hYhC8  
  m_Path+="\\"; v2H#=E4cZ#  
 UpdateData(FALSE); TF 'U  
} <$F\Nk|x  
yY[<0|o u  
void CCaptureDlg::SaveBmp() JJ{9U(`_y6  
{ (FJ9-K0b{n  
 CDC dc; L=q+|j1>  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); p98~&\QT  
 CBitmap bm; $BFvF ,n  
 int Width=GetSystemMetrics(SM_CXSCREEN); ?t+5s]  
 int Height=GetSystemMetrics(SM_CYSCREEN); %]I ZLJ  
 bm.CreateCompatibleBitmap(&dc,Width,Height); &^}6 9  
 CDC tdc; mp9{m`Jb*  
 tdc.CreateCompatibleDC(&dc); G:pEE:W[  
 CBitmap*pOld=tdc.SelectObject(&bm); U$ F{nZ1  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); '@jXbN  
 tdc.SelectObject(pOld); tID%}Zv  
 BITMAP btm; &}?$i7x5  
 bm.GetBitmap(&btm); ;5tazBy&:C  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; qTAc[Ko  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ~mO62(8m  
 BITMAPINFOHEADER bih; ep=qf/vd<  
 bih.biBitCount=btm.bmBitsPixel; ~=KJzOS,S  
 bih.biClrImportant=0; Ee@4 %/v  
 bih.biClrUsed=0; >nw++[K_  
 bih.biCompression=0; n>A98NQ  
 bih.biHeight=btm.bmHeight; 2Fz|fW_  
 bih.biPlanes=1; VxY+h`4#  
 bih.biSize=sizeof(BITMAPINFOHEADER); (tCUlX2  
 bih.biSizeImage=size; vfl5Mx4  
 bih.biWidth=btm.bmWidth; #% of;mJv  
 bih.biXPelsPerMeter=0; Ya;9]k8,  
 bih.biYPelsPerMeter=0; 6I!7c^]t  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); :=8t"rO=W  
 static int filecount=0; c%[#~;E  
 CString name; KN?6;G{  
 name.Format("pict%04d.bmp",filecount++);  ;zYqsS  
 name=m_Path+name; a)S+8uU  
 BITMAPFILEHEADER bfh; )13dn]o=2  
 bfh.bfReserved1=bfh.bfReserved2=0; D K=cVpN%s  
 bfh.bfType=((WORD)('M'<< 8)|'B'); BCe|is0  
 bfh.bfSize=54+size; &Ch#-CUE/  
 bfh.bfOffBits=54; FL8g5I  
 CFile bf; .Wq@gV  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ K"b`#xN(t  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 1fo U  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); rp6q?3=g  
  bf.WriteHuge(lpData,size); +&Hr4@pgW  
  bf.Close(); jMbC Y07v  
  nCount++; o$[z],RO  
 } !!4Qj  
 GlobalFreePtr(lpData); V^hE}`>z&  
 if(nCount==1) ZVbl88,(l  
  m_Number.Format("%d picture captured.",nCount); n @?4b8"  
 else _:X|.W  
  m_Number.Format("%d pictures captured.",nCount); p|Q*5TO  
  UpdateData(FALSE); !<UJ6t}  
} b:R-mg.VT{  
k51Eyy50(  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ZkIgL  
{ +8v9flh  
 if(pMsg -> message == WM_KEYDOWN) = <j"M85.  
 { N gLU$/y;  
  if(pMsg -> wParam == VK_ESCAPE) _=q! BW  
   return TRUE; wtT}V=_  
  if(pMsg -> wParam == VK_RETURN) &z]K\-xp  
   return TRUE; etoo #h"]1  
 } kl"+YF5/  
 return CDialog::PreTranslateMessage(pMsg); "*;;H^d  
} /sr2mt-Q  
u(OW gbA3  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) HLBkR>e  
{ ?%VI{[y#>  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Ov#=]t5  
  SaveBmp(); I+!:K|^  
  return FALSE; ?H_ LX;r  
} >yXN,5d[  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 2P]L9'N{Y  
 CMenu pop; CH fVQ|!\  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); `'\t$nU  
 CMenu*pMenu=pop.GetSubMenu(0); `xz<>g9e  
 pMenu->SetDefaultItem(ID_EXITICON); / }Rz=&  
 CPoint pt; }lK3-2Pk  
 GetCursorPos(&pt); gJ;_$`  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); L:(1ZS  
 if(id==ID_EXITICON) Yp0/Ab(v  
  DeleteIcon(); %0 #XPc("  
 else if(id==ID_EXIT) r?CI)Y;  
  OnCancel(); 0QvT   
 return FALSE; , =aJVb=C  
} ifo7%XPcg  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 'S[++w?Qq  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) RJy=pNztm  
 AddIcon(); VR  
 return res; ltkI}h,e  
} S}f?.7  
=C L} $_  
void CCaptureDlg::AddIcon() 1yV: qp  
{ wZ4tCZA  
 NOTIFYICONDATA data; <$N"q  
 data.cbSize=sizeof(NOTIFYICONDATA); uNn[[LS  
 CString tip; :K ~  
 tip.LoadString(IDS_ICONTIP); H33i*][H  
 data.hIcon=GetIcon(0); \}~s2Y5j  
 data.hWnd=GetSafeHwnd(); Y-'78BJk  
 strcpy(data.szTip,tip); U xD5eJJ  
 data.uCallbackMessage=IDM_SHELL; }<z_Q_b+e  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; q %0Cg=  
 data.uID=98; hky;CD~$  
 Shell_NotifyIcon(NIM_ADD,&data); S!PzLTc  
 ShowWindow(SW_HIDE); peJKNX.!q  
 bTray=TRUE; '+ xu#R  
} [xh*"wT#g  
8vuCc=  
void CCaptureDlg::DeleteIcon() saU]`w_Z*  
{ OEPa|rb  
 NOTIFYICONDATA data; -k(CJ5H9  
 data.cbSize=sizeof(NOTIFYICONDATA); sz-- 27es  
 data.hWnd=GetSafeHwnd(); ^'p|!`:  
 data.uID=98; A~Xq,BxCV  
 Shell_NotifyIcon(NIM_DELETE,&data); zZiJ 9 e  
 ShowWindow(SW_SHOW); m=Q[\.Ra  
 SetForegroundWindow(); <*t4D-os  
 ShowWindow(SW_SHOWNORMAL); U!XS;a)  
 bTray=FALSE; A:y.s;<L 0  
} }pa9%BQI  
4d_s%n?C  
void CCaptureDlg::OnChange() M7>(hVEAW'  
{ P]i =r] i  
 RegisterHotkey(); V:/7f*n7  
} \v6 M:KR5/  
l%Gw_0.?e  
BOOL CCaptureDlg::RegisterHotkey() AF43$6KZP$  
{ ubu?S%`  
 UpdateData(); },5'z {3E  
 UCHAR mask=0; LkLN7|  
 UCHAR key=0; - }!H3]tr  
 if(m_bControl) O)kg B rB  
  mask|=4; !;6Jng%  
 if(m_bAlt) \@}#Gez  
  mask|=2; ri1C-TJM)  
 if(m_bShift) q8:{Nk  
  mask|=1; tRw@U4=y  
  key=Key_Table[m_Key.GetCurSel()]; X%bFN  
 if(bRegistered){ 0t#g }  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); cL8#S>>u.  
  bRegistered=FALSE; .Hc(y7HV  
 } okq[ o90  
 cMask=mask; \V2,pi8'v  
 cKey=key; r}u%#G+K,  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); I _i6-<c.Q  
 return bRegistered; M HL("v(@B  
} tn|,O.t  
J ti(b*~  
  四、小结 7([h4bg{  
0)Rw|(Fpo]  
  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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