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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: xgpf2y!{  
  FouN}X6  
  一、实现方法 bS954d/  
E-FR w  
  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: 5Z5x\CcC3  
$CX3P)% `  
#pragma data_seg("shareddata") Ym! e}`A\F  
HHOOK hHook =NULL; //钩子句柄 *f`P7q*  
UINT nHookCount =0; //挂接的程序数目 5,g +OY=\  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ={V@Y-5T  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 { I\og  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey "k{so',7z  
static int KeyCount =0; DuZZu  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 x\f~Gtt7Y  
#pragma data_seg() &>E gKL  
79exZ7|  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 .kn2M&P>=  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: |5O>7~Tp  
o ]z#~^w  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR }u=Oi@~  
cKey,UCHAR cMask) ^2+ Vt=*  
{ .9PT)^2  
 BOOL bAdded=FALSE; ) ba~7A  
 for(int index=0;index<MAX_KEY;index++){ |iUC\F=-  
  if(hCallWnd[index]==0){ g$?^bu dxv  
   hCallWnd[index]=hWnd; {\P%J:s#9  
   HotKey[index]=cKey; r~ 2*'zB  
   HotKeyMask[index]=cMask; x3+ {Y  
   bAdded=TRUE; E G\;l9T  
   KeyCount++; 6w, "i#E!  
   break; %Uz\P|6PO  
  } b/]4#?g  
 } f:<BUqa  
 return bAdded; f17E2^(I(}  
} }^ ,D~b-nB  
//删除热键 r9'[7b1l  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) M(LIF^'U:m  
{ {7z]+h  
 BOOL bRemoved=FALSE; emK*g<]  
 for(int index=0;index<MAX_KEY;index++){ .hR <{P  
  if(hCallWnd[index]==hWnd){ #~"IlBk\  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Y%;X7VxU*  
    hCallWnd[index]=NULL; MJ1qU}+]  
    HotKey[index]=0; tZz%x?3G  
    HotKeyMask[index]=0; V<jj'dZfW  
    bRemoved=TRUE; J&,hC%]  
    KeyCount--; %oTBh*K'o  
    break; fe98 Y-e  
   } h-?yed*?  
  } RO,TNS~  
 } _lwKa, }  
 return bRemoved; a*U[;(  
} e'G=.:  
Y$A2{RjRq  
"8ellKh  
  DLL中的钩子函数如下: Kq-1  b  
o /[7Vo  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) iBSg`"S^]C  
{ Vb\g49\o/  
 BOOL bProcessed=FALSE; 2a eH^:u  
 if(HC_ACTION==nCode) /}8Au$nA  
 { $S|+U}]C  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 &um++ \  
   switch(wParam) a(]&H "  
   {  zdRVAcrwQ  
    case VK_MENU: tJrGRlB>  
     MaskBits&=~ALTBIT; 4=Ru{ewRV  
     break; xL"J?Gy  
    case VK_CONTROL: "5~?`5Ff  
     MaskBits&=~CTRLBIT; XxS#~J?:_  
     break; d\]KG(T  
    case VK_SHIFT: @ztT1?!e  
     MaskBits&=~SHIFTBIT; LkS tU)  
     break; eTvjo(Lvx  
    default: //judge the key and send message ZZI} Ot{  
     break; 'kt6%d2  
   } @Xl(A]w%!  
   for(int index=0;index<MAX_KEY;index++){ s.i9&1Y-!  
    if(hCallWnd[index]==NULL) f/UU{vX(  
     continue; nLz;L r!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) WX?nq'nr  
    { "I/05k K  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); K {v^Y,B  
     bProcessed=TRUE; _Fa\y ZX  
    } /-[vC$B"  
   } iIX%%r+  
  } A'z]?xQR  
  else if((lParam&0xc000ffff)==1){ //有键按下 i~]6 0M>  
   switch(wParam) >B**fZ~L  
   { >*ls} q^  
    case VK_MENU: w+ !c9  
     MaskBits|=ALTBIT; 1Ys=KA-!_x  
     break; zP #:Tv'  
    case VK_CONTROL: S u6kpC!EW  
     MaskBits|=CTRLBIT; Za|iU`e\  
     break; C78g|n{  
    case VK_SHIFT: qm!oJL  
     MaskBits|=SHIFTBIT; V=8db% ^  
     break; w)+1^eW  
    default: //judge the key and send message xB Wl|j  
     break; 81{8F  
   } N'ER!=l)  
   for(int index=0;index<MAX_KEY;index++){ l+"p$iZs  
    if(hCallWnd[index]==NULL) n~ad#iN  
     continue; `~)?OTzU#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ?DUim1KG  
    { #RR;?`,L}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); t"GnmeH i  
     bProcessed=TRUE; ,W)DQwAg  
    } |JIlp"[  
   } ZL<X* l2  
  } F8-GnT xa  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 %"mI["{  
   for(int index=0;index<MAX_KEY;index++){ q*&H  
    if(hCallWnd[index]==NULL) c8X;4 My  
     continue; >2{Y5__+e  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) uK"  T~  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); $\J5l$tU  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 p-.kBF  
   } GuR^L@+ -.  
  } U? Jk  
 } Gkuqe3  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); U,i_}O3Q  
} lu"0\}7X  
d9v66mpJM  
  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: <?7qI85OT  
IsI5c  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); yHw @Z  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); INbV6jZL  
D}y W:Pi'  
  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: t/Io.d   
zb9G&'7  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 9 fB|e|  
{ ' 9f0UtT|[  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) >va_,Y}  
 { xcW\U^1d  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 1}wDc$O  
  SaveBmp(); 9lYfII}4(  
  return FALSE; BC.3U.  
 } d9S/_iCI  
 …… //其它处理及默认处理 ny13+Q`^  
} g8MW6Y  
u:pOP  
)]C]KB  
  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。 rk1,LsZVS  
#E!^oZm<Z  
  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。 GO"|^W  
bfz7t!A)A  
  二、编程步骤 ~ q-Z-MA  
uG7]s]Wdz;  
  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"; $f3IO#N  
<)T| HKx  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ' J@J$#6  
>(a35 b$  
  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; n3~axRPO  
; H ;h[  
  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; /lC# !$9vz  
+I3Vfv  
  5、 添加代码,编译运行程序。 h-ii-c?R@0  
r!Dk_| Cd  
三、程序代码 8C3oi&av/{  
-yqgs>R(d  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL >S:(BJMo  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) \bdKLcKI,  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ *`+zf7-f  
#if _MSC_VER > 1000 zG_nx3  
#pragma once cQt&%SVT]E  
#endif // _MSC_VER > 1000 c_vGr55  
#ifndef __AFXWIN_H__ ,A`|jF  
#error include 'stdafx.h' before including this file for PCH jyIIE7.I"  
#endif `(HD'fud3  
#include "resource.h" // main symbols phu,&DS!  
class CHookApp : public CWinApp 8HKv_vl  
{ !rRBy3&  
 public: s*Qyd{"z  
  CHookApp(); y-+W  
  // Overrides !lfE7|\p  
  // ClassWizard generated virtual function overrides Vpg>K #w  
  //{{AFX_VIRTUAL(CHookApp) t~ {O)tt  
 public: (5!'42  
  virtual BOOL InitInstance(); qa^cJ1@  
  virtual int ExitInstance(); Kc\8GkdB  
  //}}AFX_VIRTUAL 0L/chP  
  //{{AFX_MSG(CHookApp) LnE/62){N  
  // NOTE - the ClassWizard will add and remove member functions here. ,7@\e &/&  
  // DO NOT EDIT what you see in these blocks of generated code ! ;EJ!I+�  
  //}}AFX_MSG L /ibnGhq]  
  DECLARE_MESSAGE_MAP() ExtC\(X;  
}; .hx(9  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); e7GYz7  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); rB".!b  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1+*sEIC"  
BOOL InitHotkey(); i+O7,"(@  
BOOL UnInit();  'l5  
#endif &6 s&nx  
x,mt}>  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. -6DRX  
#include "stdafx.h" `$> Y  
#include "hook.h" U 2YY   
#include <windowsx.h> tsg`c;{  
#ifdef _DEBUG J*rYw5QB  
#define new DEBUG_NEW '/xynk%)xw  
#undef THIS_FILE '=$`NG8 l  
static char THIS_FILE[] = __FILE__; m'}`+#C%)  
#endif mce qZv  
#define MAX_KEY 100 B{Vc-qJ  
#define CTRLBIT 0x04 6,YoP|@0  
#define ALTBIT 0x02 3 zh:~w_  
#define SHIFTBIT 0x01 :8@)W<>%  
#pragma data_seg("shareddata") D@&xj_#\}  
HHOOK hHook =NULL; lkT :e)w  
UINT nHookCount =0; (NFrZ0  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Chnt)N`/B4  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ~NIhS!  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey /lECgu*#69  
static int KeyCount =0; &fB=&jc*j  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift GPLop/6   
#pragma data_seg() } iKjef#J  
HINSTANCE hins; ~B{08%|oK  
void VerifyWindow(); 8D)1ZUx7`  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 2J t{oh|  
//{{AFX_MSG_MAP(CHookApp) By@65KmR"  
// NOTE - the ClassWizard will add and remove mapping macros here. 3=n6N TL  
// DO NOT EDIT what you see in these blocks of generated code! V$hL\`e  
//}}AFX_MSG_MAP iHNQxLkk{:  
END_MESSAGE_MAP() cVx SO`jZw  
Ac U@H0  
CHookApp::CHookApp() AwG0E `SU  
{ ({rcH.:  
 // TODO: add construction code here, ]^"Lc~w8&  
 // Place all significant initialization in InitInstance }Ecv6&G  
} |*t2IVwX  
f@;pN=PS  
CHookApp theApp; WS[Z[O  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) RI8*'~ix]  
{ /b>xQ.G  
 BOOL bProcessed=FALSE; Ph P)|P  
 if(HC_ACTION==nCode) ~4+Y BN  
 { h.R46:  
  if((lParam&0xc0000000)==0xc0000000){// Key up O W.CU=XU  
   switch(wParam) w98M #GqV  
   { VX8rM!3  
    case VK_MENU: 1_{e*=/y  
     MaskBits&=~ALTBIT; H4`>B>\  
     break; .pPuBJL]<  
    case VK_CONTROL: -}<Ru)  
     MaskBits&=~CTRLBIT; wzy[sB274  
     break; J#C4A]A  
    case VK_SHIFT: +#wVe  
     MaskBits&=~SHIFTBIT; H,TApF89A  
     break; "=DQ {(L  
    default: //judge the key and send message #EUT"^:d  
     break; 3\RD %[}  
   } ;O)*!yA(GG  
   for(int index=0;index<MAX_KEY;index++){ @>(JC]HtR  
    if(hCallWnd[index]==NULL) kAp#6->(q  
     continue; Y}BP ]#1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) xKE=$SV(  
    { !B Pm{_C  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); H^kOwmSzh  
     bProcessed=TRUE; O$,  
    } hkl0N%[  
   } rrfJs  
  } TY% c`Q5  
  else if((lParam&0xc000ffff)==1){ //Key down ?J2A.x5` a  
   switch(wParam) \LJ!X3TZ  
   { V/xXW=  
    case VK_MENU: ~.x#ic  
     MaskBits|=ALTBIT; %iNgHoH  
     break; F-ZTy"z  
    case VK_CONTROL: 5)Z=FUupA~  
     MaskBits|=CTRLBIT; ! xM=7Q k  
     break; 4J[zNB]  
    case VK_SHIFT: v`mB82s  
     MaskBits|=SHIFTBIT; 7ucm1   
     break; Mhn1-ma:  
    default: //judge the key and send message 9~=zD9,|iA  
     break; O-7)"   
   } j)8$hK/e0.  
   for(int index=0;index<MAX_KEY;index++) ">=Ep+ix  
   { `Eg X#  
    if(hCallWnd[index]==NULL) H2|'JA#v  
     continue; x7 e0&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) F^{31iU~CX  
    { 'eBD/w5U  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ~roNe|P  
     bProcessed=TRUE; )0 E_Y@  
    } 5D<Zbn.>q  
   } -cUbIbW  
  } *2/qm:gB  
  if(!bProcessed){ HdlO Ga6C  
   for(int index=0;index<MAX_KEY;index++){ G0h&0e{w  
    if(hCallWnd[index]==NULL) KsIHJr7-  
     continue; $yU}56(z~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) <= _!8A  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); BYdG K@ouk  
   } 8aHE=x/TL  
  } >!Y#2]@}o  
 } ^7>~y(  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 5q@s6_"{  
} 00IW9B-  
PdVY tK%  
BOOL InitHotkey() f%n ;Z}=  
{ ;\}d QsX  
 if(hHook!=NULL){ }>AA[ba"'  
  nHookCount++; VTR4uT-  
  return TRUE; v(0ujfSR0  
 } au19Q*r9  
 else cg^~P-i@*  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); "4xo,JUf  
  if(hHook!=NULL) *6<4ECa7C  
   nHookCount++; ).GM 0-y  
  return (hHook!=NULL); TR*vZzoy  
} lE%KzX?&  
BOOL UnInit() H/`@6, j  
{ A- m IWTa  
 if(nHookCount>1){ o_=4Ex "  
  nHookCount--; @Oz3A<M  
  return TRUE; P=}dR&gk'  
 } n&&C(#mBC  
 BOOL unhooked = UnhookWindowsHookEx(hHook); :Nf(:D8  
 if(unhooked==TRUE){ Jm)7!W%3  
  nHookCount=0; vK/`or3U  
  hHook=NULL; 5h Sd,#:  
 } zQO 1%g  
 return unhooked; bZUw^{~)D  
} OR+_s @Yg  
S=kO9"RB]  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) dm"x?[2:  
{ 5{ +>3J  
 BOOL bAdded=FALSE;  l #]#_  
 for(int index=0;index<MAX_KEY;index++){ xc-[gt6  
  if(hCallWnd[index]==0){ 78:x{1nUM[  
   hCallWnd[index]=hWnd; UxB3/!<5g3  
   HotKey[index]=cKey; 9G6ZKqum  
   HotKeyMask[index]=cMask; ^PE|BCs  
   bAdded=TRUE; (bsywM  
   KeyCount++; yz,_\{}  
   break; '`gnJX JO  
  } ^-Arfm%dn  
 } #a@jt  
 return bAdded; W,,3@:  
} m4uh<;C~  
dm_Pz\ *  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) -#;ZZ \fdj  
{ %L)QTv/  
 BOOL bRemoved=FALSE; BE&8E\w  
 for(int index=0;index<MAX_KEY;index++){ *1-0s*T  
  if(hCallWnd[index]==hWnd){ JgHYuLB  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ dg*xo9Xi`  
    hCallWnd[index]=NULL; h5@7@w%  
    HotKey[index]=0; +>eX1WoTy  
    HotKeyMask[index]=0; T>*G1-J#  
    bRemoved=TRUE; <2 kv/  
    KeyCount--; O5:U2o-  
    break; 'S74Ys=-0  
   } sqF.,A,  
  } CD#U`jf  
 } F@ pf._c  
 return bRemoved; K&{ _s  
} Lwm /[  
!]7b31$M_  
void VerifyWindow() j p}.W  
{ ldU ><xc2  
 for(int i=0;i<MAX_KEY;i++){ ZvXw#0)v  
  if(hCallWnd!=NULL){ (7,Q4T  
   if(!IsWindow(hCallWnd)){ c3rj :QK6I  
    hCallWnd=NULL; opn6 C )  
    HotKey=0; ('uUf!h?\  
    HotKeyMask=0; v`'Iew }  
    KeyCount--; * #z@b  
   } l| \ -d  
  } *j<#5=l  
 } =d~pr:.F  
} bs% RWwn  
45Zh8k  
BOOL CHookApp::InitInstance() bx6=LK  
{ Rq",;,0ZJ  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); # ax% n  
 hins=AfxGetInstanceHandle(); qKeR}&b  
 InitHotkey(); &{wRBl#  
 return CWinApp::InitInstance(); Y> E` 7n  
} zcOm"-E-  
^I6Vz?0Jl  
int CHookApp::ExitInstance() c9nv=?/}f  
{ )FA:wsy~E  
 VerifyWindow(); FW3E UC)P  
 UnInit(); m4~~q[t  
 return CWinApp::ExitInstance(); R;U4a2~  
} 2Z"\%ZD  
F!?f|z,/  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file N48X[Q*  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ox.kL  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ MR@Qn[RdM  
#if _MSC_VER > 1000 0[uOKFgE  
#pragma once 9&kPcFX B  
#endif // _MSC_VER > 1000 ^*y 1Fn0  
4 8; b  
class CCaptureDlg : public CDialog c\szy&W  
{ RMs8aZCa  
 // Construction KdTWi;mV2-  
 public: l]R7A_|  
  BOOL bTray; ]H`pM9rC  
  BOOL bRegistered; +uNMyVH  
  BOOL RegisterHotkey(); V!@6Nv  
  UCHAR cKey; w JgH15oB  
  UCHAR cMask; SuV3$-);z  
  void DeleteIcon(); x=\W TC  
  void AddIcon(); hSps9*y  
  UINT nCount; 0;w 4WJJ  
  void SaveBmp(); siV]NI ':|  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor sQr M"i0Y>  
  // Dialog Data #'i,'h+F  
  //{{AFX_DATA(CCaptureDlg) UH(w, R`  
  enum { IDD = IDD_CAPTURE_DIALOG }; YiL^KK  
  CComboBox m_Key; Kj?hcG l[  
  BOOL m_bControl; D~Q -:G$x  
  BOOL m_bAlt; j@UE#I|h  
  BOOL m_bShift; Hy'EbQ  
  CString m_Path; r M}o)  
  CString m_Number; |w>b0aY  
  //}}AFX_DATA CNWA!1n^Hy  
  // ClassWizard generated virtual function overrides i}|jHlv  
  //{{AFX_VIRTUAL(CCaptureDlg) @o<B>$tbu4  
 public: }KftV nD?  
  virtual BOOL PreTranslateMessage(MSG* pMsg); SFEDR?s   
 protected: (A?w|/bZd  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 0}:Wh&g  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); k0b6X5  
  //}}AFX_VIRTUAL /;y`6WG%2  
  // Implementation NOAz"m+o  
 protected: "-IF_Hid  
  HICON m_hIcon; .%0a  
  // Generated message map functions olHmRJ  
  //{{AFX_MSG(CCaptureDlg) AOqL&z  
  virtual BOOL OnInitDialog(); fCO<-L9k$  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 5@W63!N  
  afx_msg void OnPaint(); @6;ZP1  
  afx_msg HCURSOR OnQueryDragIcon(); 0uGTc[^^M  
  virtual void OnCancel(); cp`ZeLz2^  
  afx_msg void OnAbout(); BuitM|k'  
  afx_msg void OnBrowse(); y<BG-  
  afx_msg void OnChange(); Smh=Q4,W  
 //}}AFX_MSG $p }q,f.  
 DECLARE_MESSAGE_MAP() E;k$ICOXA  
}; }1a(*s,s-^  
#endif \2Q#'  
M,r8 No  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file %r(qQM.Pl  
#include "stdafx.h" /p}pdXS  
#include "Capture.h" Y$ KR\ m  
#include "CaptureDlg.h" p7.~k1h  
#include <windowsx.h> (K ]wk9a  
#pragma comment(lib,"hook.lib") ,a0RI<D  
#ifdef _DEBUG fQw=z$  
#define new DEBUG_NEW gEgd/Le  
#undef THIS_FILE @c>MROlrlF  
static char THIS_FILE[] = __FILE__; BISH34  
#endif =""5 c  
#define IDM_SHELL WM_USER+1 je>mAQKi\  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); G}]'}FUp  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); [xdVuL;N  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; +mO/9m  
class CAboutDlg : public CDialog M@pF[J/  
{ "SC]G22  
 public: 7PO]\X^(zE  
  CAboutDlg(); <c,iu{:  
  // Dialog Data 6>'>BamX  
  //{{AFX_DATA(CAboutDlg) UnZc9 6  
  enum { IDD = IDD_ABOUTBOX }; W:8{}Iu<  
  //}}AFX_DATA (r1"!~d@  
  // ClassWizard generated virtual function overrides SEM- t   
  //{{AFX_VIRTUAL(CAboutDlg) Pn ?gB}l  
 protected: }JUc!cH8z  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support zRR^v&.9K  
  //}}AFX_VIRTUAL ki ?V eFp  
  // Implementation !|J2o8g  
 protected: J!QIMA4{  
  //{{AFX_MSG(CAboutDlg) ZV-Yq !|t  
  //}}AFX_MSG ,L\KS^>  
  DECLARE_MESSAGE_MAP() 9S5C{~P4  
}; O4^' H}*  
b: I0Zv6  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) tCj\U+;  
{ |uJjO>8]|  
 //{{AFX_DATA_INIT(CAboutDlg) nbDjoZZ4  
 //}}AFX_DATA_INIT IY@N  
} OskQ[ e0  
H<*n5r(c  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ^*,?x  
{ J8&0l&~ 6  
 CDialog::DoDataExchange(pDX); "DecS:\  
 //{{AFX_DATA_MAP(CAboutDlg) \`*]}48Z  
 //}}AFX_DATA_MAP - C8VDjf9  
} Pf3F)y[=  
{J;(K~>?m  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) @~i : 8  
 //{{AFX_MSG_MAP(CAboutDlg) +a+DiD>./  
 // No message handlers v#5hK<9  
 //}}AFX_MSG_MAP 8'Q&FW3"  
END_MESSAGE_MAP() Zo Ra^o  
hXc:y0 0  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Bv 7os3xb  
: CDialog(CCaptureDlg::IDD, pParent) fz+dOIU3\L  
{ )qDV3   
 //{{AFX_DATA_INIT(CCaptureDlg) 6ziBGU#.-  
  m_bControl = FALSE; [E qZj/  
  m_bAlt = FALSE; H00iy$R  
  m_bShift = FALSE; QghL=  
  m_Path = _T("c:\\"); H 9?txNea  
  m_Number = _T("0 picture captured."); Jg6@)<n  
  nCount=0; D@ BP<   
  bRegistered=FALSE; i\ )$  
  bTray=FALSE; b,#?LdQ%  
 //}}AFX_DATA_INIT cfc=a  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ypTH=]y  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); hz-^9U  
} U@LIw6B!KL  
iu`B8yI  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 87R$Y> V  
{ =o[H2o y  
 CDialog::DoDataExchange(pDX); {t('`z  
 //{{AFX_DATA_MAP(CCaptureDlg) oe=W}y_k  
  DDX_Control(pDX, IDC_KEY, m_Key); suN}6C I  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); uLt31G()  
  DDX_Check(pDX, IDC_ALT, m_bAlt); -]:1zU  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); r <2&_$|  
  DDX_Text(pDX, IDC_PATH, m_Path); ]OC?g2&6  
  DDX_Text(pDX, IDC_NUMBER, m_Number); E/C3t2@-  
 //}}AFX_DATA_MAP \"+}-!wr  
} 07vzVsQ}p  
?|GwuG8g  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Mw6 Mt  
//{{AFX_MSG_MAP(CCaptureDlg) DV!0zzJ  
 ON_WM_SYSCOMMAND() yONX?cS  
 ON_WM_PAINT() GP=bp_L  
 ON_WM_QUERYDRAGICON() 58PL@H~@0  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) yDi'@Z9R?  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) k.%FGn'fR  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ~01t_Xp qc  
//}}AFX_MSG_MAP  [4mIww%  
END_MESSAGE_MAP() W"D>>]$|u  
&M #}?@!C  
BOOL CCaptureDlg::OnInitDialog() oLt%i:,A  
{ $A)[s$  
 CDialog::OnInitDialog(); t<SCrLbz  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ,d8*7my  
 ASSERT(IDM_ABOUTBOX < 0xF000); Y>CZ  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 4`:Eiik&p  
 if (pSysMenu != NULL) #D%l;Ae  
 { is{H >#+"  
  CString strAboutMenu; YF)c.Q0  
  strAboutMenu.LoadString(IDS_ABOUTBOX); IG4`f~k^  
  if (!strAboutMenu.IsEmpty()) (usPAslr  
  { LP}'upv  
   pSysMenu->AppendMenu(MF_SEPARATOR); ({h W  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Ka8Bed3  
  } KY9@2JG  
 } &hIr@Gi@ch  
 SetIcon(m_hIcon, TRUE); // Set big icon -8sB\E  
 SetIcon(m_hIcon, FALSE); // Set small icon gzp]hh@4  
 m_Key.SetCurSel(0); GAlM:>  
 RegisterHotkey(); b2hXFwPe  
 CMenu* pMenu=GetSystemMenu(FALSE); lkb,UL;V  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); [:l=>yJ{(  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); KK/siG~O  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 2Jt*s$  
 return TRUE; // return TRUE unless you set the focus to a control F2',3  
} %5<Xa  
y+M9{[ i/O  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) bqQR";  
{ 7Dz-xM_?  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) E<tJ8&IGk  
 { bDV/$@p  
  CAboutDlg dlgAbout; gnw?Y 2  
  dlgAbout.DoModal(); d-B,)$zE  
 } 1j!{?t ?  
 else ]J.|XRp/  
 { ,UW!?}@  
  CDialog::OnSysCommand(nID, lParam); P"Y7N?\](  
 } ?rQIUP{D7  
} !Gh*Vtd8-  
f+4j ^y}  
void CCaptureDlg::OnPaint() )/BbASO$)Z  
{ 6f;20dn 6  
 if (IsIconic()) m@g9+7  
 { EskD)Sl   
  CPaintDC dc(this); // device context for painting OTWp,$YA=  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); @}_Wl<kn  
  // Center icon in client rectangle Z':w X  
  int cxIcon = GetSystemMetrics(SM_CXICON); %kV #UzL  
  int cyIcon = GetSystemMetrics(SM_CYICON); 4X$|jGQ\  
  CRect rect; = Tq\Ag:  
  GetClientRect(&rect); GNoUn7Y  
  int x = (rect.Width() - cxIcon + 1) / 2; ;~n^/D2.  
  int y = (rect.Height() - cyIcon + 1) / 2; :E2 ww`  
  // Draw the icon 2@|,VN V6~  
  dc.DrawIcon(x, y, m_hIcon); v=E(U4v9e  
 } 7K /quJ  
 else c{})Z=  
 { hfRxZ>O2  
  CDialog::OnPaint(); 0!q@b  
 } yjIA`5^  
} kB_T9$0e#  
x\K,@  
HCURSOR CCaptureDlg::OnQueryDragIcon() |6b&khAM  
{ Ko %e#q-  
 return (HCURSOR) m_hIcon; Si-Q'*Y=  
} rchKrw  
}EN-WDJD\  
void CCaptureDlg::OnCancel() W]M Fq5.  
{ /2:s g1  
 if(bTray) 1 ( rN  
  DeleteIcon(); $[+)N ~  
  CDialog::OnCancel(); G/yYIs  
} ria.MCe\!  
m[Cp G=32B  
void CCaptureDlg::OnAbout() # 2?3B  
{ jh/aK_Q,w  
 CAboutDlg dlg; .:B;%*  
 dlg.DoModal(); wfQImCZ>l  
} C{]1+eL  
KDLrt  
void CCaptureDlg::OnBrowse() 1i@a? 27|  
{ PySFhb@  
 CString str; yMJ(Sf  
 BROWSEINFO bi; =!DpWVsQ  
 char name[MAX_PATH]; -BEd7@?A  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); yhd]s0(!  
 bi.hwndOwner=GetSafeHwnd(); W@Rb"5Gy+  
 bi.pszDisplayName=name; @81N{tg-  
 bi.lpszTitle="Select folder"; * 5(%'3  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; TPNKvv!s  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ev1:0P  
 if(idl==NULL) JHg y&/  
  return; [rReBgV  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); \/R $p  
 str.ReleaseBuffer(); 0t6DD  
 m_Path=str; Te7xj8<  
 if(str.GetAt(str.GetLength()-1)!='\\') C(2kx4n  
  m_Path+="\\"; (9v%66y  
 UpdateData(FALSE); G$;cA:p-j  
} KxQMPtHstz  
o~26<Lk  
void CCaptureDlg::SaveBmp() ^n*:zmD  
{ c uHF^l  
 CDC dc; $aHHXd}@t2  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); RhkTN'vO  
 CBitmap bm; UD ;UdehC  
 int Width=GetSystemMetrics(SM_CXSCREEN); +IG=|X  
 int Height=GetSystemMetrics(SM_CYSCREEN); %#E$wz  
 bm.CreateCompatibleBitmap(&dc,Width,Height); gB]jLe  
 CDC tdc; @]dv   
 tdc.CreateCompatibleDC(&dc); I !O5+Er  
 CBitmap*pOld=tdc.SelectObject(&bm); | cL,$G  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); )Kq@ m1>@  
 tdc.SelectObject(pOld); ,91n  
 BITMAP btm; OtoG,~?  
 bm.GetBitmap(&btm); DSK?7F$_oE  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; a7jE*%f9  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); mEyIbMci  
 BITMAPINFOHEADER bih; =Jswd  
 bih.biBitCount=btm.bmBitsPixel; W6V((84(O  
 bih.biClrImportant=0; mnFmShu  
 bih.biClrUsed=0; ff 6x4t  
 bih.biCompression=0; 3)hQT-)  
 bih.biHeight=btm.bmHeight; 3 5/ s\  
 bih.biPlanes=1; 4mnVXKt%.  
 bih.biSize=sizeof(BITMAPINFOHEADER); ^;wz+u4^l  
 bih.biSizeImage=size; 1wBmDEhS  
 bih.biWidth=btm.bmWidth;  7MQxW<0  
 bih.biXPelsPerMeter=0; b;5 M$  
 bih.biYPelsPerMeter=0; !1Nh`FN  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); r(JP& @  
 static int filecount=0; '~zi~Q7M  
 CString name; q2*1Gn9!j  
 name.Format("pict%04d.bmp",filecount++); $J#Z`%B^y  
 name=m_Path+name;  vPAL,  
 BITMAPFILEHEADER bfh; hP$5>G(3  
 bfh.bfReserved1=bfh.bfReserved2=0; 5 hW#BB  
 bfh.bfType=((WORD)('M'<< 8)|'B'); jOm7:+H  
 bfh.bfSize=54+size; cJzkA^T9  
 bfh.bfOffBits=54; C]Q}HI#G  
 CFile bf; P2)/!+`a  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 3ej[  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ^#U[v7y  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); se*k56,  
  bf.WriteHuge(lpData,size); RV%)~S@!R  
  bf.Close(); sW76RKX8  
  nCount++; ? 0+N  
 } svtqX-Vj"  
 GlobalFreePtr(lpData); ?%$~Bb _  
 if(nCount==1) Q+s2S>U{v  
  m_Number.Format("%d picture captured.",nCount); AOe f1^S=  
 else ~vcua@  
  m_Number.Format("%d pictures captured.",nCount); ^0?ww&X  
  UpdateData(FALSE); v ,zD52  
} ijKQ`}JA  
dtig_s,)D  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) LQV&;O4'  
{ M"6J"s  
 if(pMsg -> message == WM_KEYDOWN) O)D$UG\<  
 { C$4{'J-ZH  
  if(pMsg -> wParam == VK_ESCAPE) 3Pvz57z{  
   return TRUE; gZ8JfA_\R(  
  if(pMsg -> wParam == VK_RETURN) . Ctd$  
   return TRUE; h=^UMat-  
 } |-z"6F r-  
 return CDialog::PreTranslateMessage(pMsg); bmJdZD7-<k  
} {u4AOM=)  
O+]'*~a  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 1C0' Gf)3  
{ XW~a4If  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ wLNk XC  
  SaveBmp(); ?} lqu7S  
  return FALSE; L nyow}  
} Pk=0pHH8q  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ -Ua&/Yd/}  
 CMenu pop; Z/d {v:)  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ^ 4*#QtO  
 CMenu*pMenu=pop.GetSubMenu(0); JF=T_SH^U  
 pMenu->SetDefaultItem(ID_EXITICON); z<gII~%  
 CPoint pt; TeFi[1  
 GetCursorPos(&pt); 4gZ)9ya   
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); wj5,_d)  
 if(id==ID_EXITICON) b*ja,I4  
  DeleteIcon(); ;te( {u+  
 else if(id==ID_EXIT) 0[ (kFe  
  OnCancel(); Dw$RHogb~y  
 return FALSE; F<Xtp8  
} a'r1or4  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); }KT$J G?  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) UhJ!7Ws$  
 AddIcon(); 5 9i2*<k  
 return res; E6M*o+Y  
} <'\!  
X"7x_ yOZ  
void CCaptureDlg::AddIcon() @!^Y_q  
{ $k`j";8uR  
 NOTIFYICONDATA data; 5 ed|]LP  
 data.cbSize=sizeof(NOTIFYICONDATA); (LJ7xoJ^  
 CString tip; ZrB(!L~7  
 tip.LoadString(IDS_ICONTIP); >< VUly  
 data.hIcon=GetIcon(0); _&S;*?K.  
 data.hWnd=GetSafeHwnd(); Gte\=0Wr  
 strcpy(data.szTip,tip); i)$ySlEh  
 data.uCallbackMessage=IDM_SHELL; |>'q%xK  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; z[K)0@8 6  
 data.uID=98; /IF?|71,m  
 Shell_NotifyIcon(NIM_ADD,&data); ^m AxV7k  
 ShowWindow(SW_HIDE); Mi\- 9-  
 bTray=TRUE; YFW/ Fa\7  
} 9$D}j"  
p,!IPWo  
void CCaptureDlg::DeleteIcon() q_98=fyE6  
{ xxwbX6^d  
 NOTIFYICONDATA data; FR>[ g`1  
 data.cbSize=sizeof(NOTIFYICONDATA); /U-+ClZi@  
 data.hWnd=GetSafeHwnd(); r$Ni>[as  
 data.uID=98; C|[x],JCS  
 Shell_NotifyIcon(NIM_DELETE,&data); #Nad1C/]  
 ShowWindow(SW_SHOW); VTY #{  
 SetForegroundWindow(); 1.TIUH1  
 ShowWindow(SW_SHOWNORMAL); &Pc.[k  
 bTray=FALSE; /1$u|Gs *  
} 7|jy:F,w%  
VLJ]OW8cO  
void CCaptureDlg::OnChange() fxmY,{{  
{ J #jFX F\  
 RegisterHotkey(); 2cSc 8  
} B I=57  
!;P[Y"h@r  
BOOL CCaptureDlg::RegisterHotkey() 0d1!Q!PH3  
{ S!b?pl  
 UpdateData(); p.b#RY  
 UCHAR mask=0; 2 /*z5  
 UCHAR key=0; H!Dj.]T  
 if(m_bControl) 'Gamb+[  
  mask|=4; $s-B  
 if(m_bAlt) v`G}sgn  
  mask|=2; %UhLCyC/  
 if(m_bShift) *{5/" H5  
  mask|=1; ;=k{[g 'gv  
  key=Key_Table[m_Key.GetCurSel()]; -yb7s2o  
 if(bRegistered){ kD7'BP/#  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); _18Z]XtX  
  bRegistered=FALSE; 5NhAb$q2Y  
 } qq3/K9 #y  
 cMask=mask; ?%#no{9  
 cKey=key; s,AJR [  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); f6nuh&!-  
 return bRegistered; $!TMS&Wk  
} }RKsS3}   
.mcohfR  
  四、小结 s,kY12<7m  
qg|ark*1u  
  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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