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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: *(>,\8OVf  
  ^+'[:rE  
  一、实现方法 *~>} *  
Ub_!~tb}?  
  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: ?0%3~E`l:  
d%wy@h  
#pragma data_seg("shareddata") bh&Wy<Y  
HHOOK hHook =NULL; //钩子句柄 8M,AFZ>F  
UINT nHookCount =0; //挂接的程序数目 :psP|7%|  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ?n0Z4 8%  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 l1?$quM^V  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey `{GI^kgJ9  
static int KeyCount =0; ^KRe(  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 _9<nM48+t  
#pragma data_seg() 2b i:Q9  
l}jC$B`5  
  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。 yJRqX]MLA  
6#SUfK;  
  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: E@(nKe&6T_  
Jdc{H/10  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR gFQ\zOlY8a  
cKey,UCHAR cMask) f}%paE"  
{ -\dcs?  
 BOOL bAdded=FALSE; b:6NVHb%  
 for(int index=0;index<MAX_KEY;index++){ f2f2&|7  
  if(hCallWnd[index]==0){ (.Th?p%>7  
   hCallWnd[index]=hWnd; vi1 D<  
   HotKey[index]=cKey; )oU%++cdo  
   HotKeyMask[index]=cMask; Wq}Y|0c  
   bAdded=TRUE;  'K7m!y  
   KeyCount++; 9z9\pXFQ  
   break; &Fg|52  
  } bMp[:dw`y  
 } i] I{7k  
 return bAdded; P1u(0t  
} 5HqvSfq>?  
//删除热键 !CGpE=V  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Z&![W@m@0N  
{ A6Vb'Gqv{  
 BOOL bRemoved=FALSE; S8Ec.]T   
 for(int index=0;index<MAX_KEY;index++){ 9(AY7]6  
  if(hCallWnd[index]==hWnd){ `Hp=1a  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){  gmW-#.  
    hCallWnd[index]=NULL; )kpNg:2p  
    HotKey[index]=0; s'4%ZE2Dr  
    HotKeyMask[index]=0; hC D6  
    bRemoved=TRUE; 49iqrP'  
    KeyCount--; qe<xH#6  
    break; + \jn$>E  
   } RE%25t|  
  } Q*54!^l+_r  
 } #i'wDvhol  
 return bRemoved; vKFEA7  
} "969F(S$  
Z(Z$>P&4  
>.1d1#+b  
  DLL中的钩子函数如下: mTU[khEmL=  
Tf{lH9ca$  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) F"| ;  
{ s^R$u"pFs  
 BOOL bProcessed=FALSE; LF X[v   
 if(HC_ACTION==nCode) f!K{f[aDa  
 { 9cXL4  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 UpSa7F:Uw  
   switch(wParam) TR&7AiqB  
   {  ' TO/i:{\  
    case VK_MENU: 9  M90X8  
     MaskBits&=~ALTBIT; [U@ ;EeS  
     break; -2qI2Z  
    case VK_CONTROL: H g04pZupN  
     MaskBits&=~CTRLBIT; vtw97G  
     break; ecMpU8}rR  
    case VK_SHIFT: Ie7S'.Lmq  
     MaskBits&=~SHIFTBIT; !%/2^  
     break; .Mxt F\  
    default: //judge the key and send message 49tJ+J-N  
     break; A)80qx:  
   } 7TB&Q*Zf  
   for(int index=0;index<MAX_KEY;index++){ 2UeK%-~W?  
    if(hCallWnd[index]==NULL) Xk?Y  
     continue; XYze*8xUb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) j*_>/gi  
    { q"-+`;^7(-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); '>:%n  
     bProcessed=TRUE; kIJ=]wU|v  
    } _T(77KLn;  
   } b>@fHmpwD  
  } ZfU &X{  
  else if((lParam&0xc000ffff)==1){ //有键按下 _Rk>yJD7s  
   switch(wParam) vs2xx`Y<Lq  
   { T?KM}<$(O  
    case VK_MENU: },%, v2}  
     MaskBits|=ALTBIT; V(=3K"j  
     break; $VJE&b  
    case VK_CONTROL: "\O{!Hj8  
     MaskBits|=CTRLBIT; J?/NJ-F  
     break; 6 g)X&pZ  
    case VK_SHIFT: j)mi~i*U  
     MaskBits|=SHIFTBIT; ?OBB)hj  
     break; rI'kZ0&  
    default: //judge the key and send message ,veo/k<"r8  
     break; 1[]V @P^  
   } $AF,4Ir-b+  
   for(int index=0;index<MAX_KEY;index++){ iUq{c+h  
    if(hCallWnd[index]==NULL) { 4B7a6  
     continue; ')Qb,#/,%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) B*^8kc:)L  
    { e/Y& d9` I  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); F$HL \y  
     bProcessed=TRUE; (G 9Ku 8Y  
    } yPk s,7U  
   } 1>)uI@?Rb  
  } Q(BM0n)f  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 $%z M Z  
   for(int index=0;index<MAX_KEY;index++){ BWLeitS/  
    if(hCallWnd[index]==NULL) ',s{N9  
     continue; 6)1xjE#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) .#_g.0<  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); uz@lz +  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 4`p[t;q  
   } vFK!LeF%  
  } ]//D d/L6  
 } oRHWb_$"  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); [(iJj3s!  
} jTN!\RH9NF  
Z9UNp[  0  
  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: eo<=Q|nI&  
r1zuc:W 1  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); }qN   
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 3gz4c1 s^:  
g.x]x #BC  
  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: R QCKH]&!  
bdyIt)tK+  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) @\Yu?_a  
{ XB+Juk&d  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Jm3iYR+,  
 { y2@8?  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 .xg, j{%(  
  SaveBmp(); {3G2-$yb  
  return FALSE; }O8#4-E_Ji  
 } o%l|16DR  
 …… //其它处理及默认处理 ^w~Utx4  
} ;mXw4_{  
|\/V1  
!z_VwZ#,  
  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。 PHqIfH [  
J-Wphc!m  
  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。 3ms{gZbw  
AjMx\'(C  
  二、编程步骤 xmwH~UWp  
IfpFsq:  
  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"; K Z Q `  
Hv .C5mo  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 8EAkM*D w  
?Q/9aqHe;  
  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; 0 hS(9y40  
Jtl[9qe#]  
  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; 8\rHSsP  
Ks.kn7<l  
  5、 添加代码,编译运行程序。 LYp=o8JW|  
"hXB_73)V  
三、程序代码 'fIirGOl  
WHv xBd  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL oWdvpvO  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) r^!P=BS{  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ZH=oQV)6  
#if _MSC_VER > 1000 28d=-s=[  
#pragma once y%xn(Bn  
#endif // _MSC_VER > 1000 dS"%( ?o  
#ifndef __AFXWIN_H__ P[a\Q`}L  
#error include 'stdafx.h' before including this file for PCH {9YNv<3  
#endif }~$96|J  
#include "resource.h" // main symbols H8?Kgaj~vf  
class CHookApp : public CWinApp ccJ!N  
{ y3pr(w9A  
 public: 16n8[U!  
  CHookApp(); [9xUMX^}  
  // Overrides EFS2 zU  
  // ClassWizard generated virtual function overrides ^FN(wvqb8  
  //{{AFX_VIRTUAL(CHookApp) \F8*HPM=*  
 public: $K*&Wdo  
  virtual BOOL InitInstance(); tJ@5E^'4  
  virtual int ExitInstance(); \k)(:[^FY  
  //}}AFX_VIRTUAL |csR"DOqz  
  //{{AFX_MSG(CHookApp) mdPEF)-  
  // NOTE - the ClassWizard will add and remove member functions here. -<.b3Mh  
  // DO NOT EDIT what you see in these blocks of generated code ! mqb6MnK -  
  //}}AFX_MSG e$y VV#  
  DECLARE_MESSAGE_MAP() :{KoZd  
}; {h *Pkn1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); m@^!?/as  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); VJ$UpqVm  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Ee-yP[2 *  
BOOL InitHotkey(); PK|"+I0  
BOOL UnInit(); d}RR!i`<N  
#endif 4]3(Vyh`  
'hl4cHk14  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. J,j!  
#include "stdafx.h" l-RwCw4f  
#include "hook.h" G!3d!$t  
#include <windowsx.h> #jNN?,ZK  
#ifdef _DEBUG 3erGTa[|q  
#define new DEBUG_NEW 5cE?>  
#undef THIS_FILE & !I$  
static char THIS_FILE[] = __FILE__; 5rx;?yvn  
#endif sy;_%,}N  
#define MAX_KEY 100 by8~'?  
#define CTRLBIT 0x04 oN6X]T<   
#define ALTBIT 0x02 01" b9`jU  
#define SHIFTBIT 0x01 Zjx:1c= b  
#pragma data_seg("shareddata") \%+5p"Z<  
HHOOK hHook =NULL; vZl]C%  
UINT nHookCount =0; qg#|1J6e  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey hIv8A_>@`  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT I,d5Y3mC  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey FOx&'dH %@  
static int KeyCount =0; O$,MdhyXC  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 2RC|u?+@  
#pragma data_seg() 8RJ^e[?o(  
HINSTANCE hins; 2[qlEtvQ  
void VerifyWindow(); t\%gP@?  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) x[5uz))  
//{{AFX_MSG_MAP(CHookApp) yq2pg8%  
// NOTE - the ClassWizard will add and remove mapping macros here. kL1StF#p  
// DO NOT EDIT what you see in these blocks of generated code! v8!Ts"  
//}}AFX_MSG_MAP Wy`ve~y  
END_MESSAGE_MAP() :AM5EO  
BHa'`lCb  
CHookApp::CHookApp() V O= o)H\  
{  rr=e  
 // TODO: add construction code here, pZg}7F{$  
 // Place all significant initialization in InitInstance nD51,1>  
} UfWn\*J&k  
08TeGUjJ  
CHookApp theApp; yMoV|U6  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) P 4|p[V8  
{ wjeuZNYf  
 BOOL bProcessed=FALSE; OW|5IEC  
 if(HC_ACTION==nCode) da/Tms`T  
 { chF@',9t  
  if((lParam&0xc0000000)==0xc0000000){// Key up .sOEqwO}>  
   switch(wParam) ?]]d s]  
   { )IH|S5mG?  
    case VK_MENU: C>:'@o Z  
     MaskBits&=~ALTBIT; b,Vg3BS  
     break; }[gk9uM_7  
    case VK_CONTROL: ecRY,MN  
     MaskBits&=~CTRLBIT; Ghb Jty`  
     break; J>XMaI})U  
    case VK_SHIFT: d^sm;f  
     MaskBits&=~SHIFTBIT; P@wuk1  
     break; *lT:P-  
    default: //judge the key and send message }; ;Thfd  
     break; g VPtd[r  
   } :_f5(N*{5o  
   for(int index=0;index<MAX_KEY;index++){ Y3QrD&V  
    if(hCallWnd[index]==NULL) 2aR<xcSg  
     continue; c?0.>^,B Q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6S GV}dAx  
    { (:P-ef$]C  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); C@3`n;yZ=  
     bProcessed=TRUE; F?B`rw@xr  
    } Qmg2lP.)  
   } 1\aJ[t  
  } BHZCM^  
  else if((lParam&0xc000ffff)==1){ //Key down zY=eeG+4s  
   switch(wParam) vk&6L%_~a  
   { ^I CSs]}1  
    case VK_MENU: Y%1 94fY$  
     MaskBits|=ALTBIT; -0>gq$/N=^  
     break; +338z<'Z!  
    case VK_CONTROL: }@XokRk  
     MaskBits|=CTRLBIT; JE<w7:R&  
     break; Sbp].3^j  
    case VK_SHIFT:  UqwU3  
     MaskBits|=SHIFTBIT; CVy\']  
     break; nde_%d$  
    default: //judge the key and send message .*Mp+Q}^  
     break; _ / >JM0  
   } 6B=: P3Y  
   for(int index=0;index<MAX_KEY;index++) h7"c_=w+  
   { -/'_XR@1  
    if(hCallWnd[index]==NULL) p"UdD  
     continue; L<62-+e`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) o<8('j   
    { l3O!{&~K  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); <1%(%KdN[  
     bProcessed=TRUE; Z.l4<  
    } S<Os\/*  
   } f)x(sk  
  } x,% %^(  
  if(!bProcessed){ a7@':Rb n  
   for(int index=0;index<MAX_KEY;index++){ R ~ZcTY[8  
    if(hCallWnd[index]==NULL) ("r\3Mvs  
     continue;  .V   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) :2zga=)g  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); BH"OphE  
   } h%%ryQQ&<  
  } y9)w(y !  
 } pv[Gg^  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); !Soz??~o/  
} je`Ysben  
JJZu%9~[  
BOOL InitHotkey() >2t.7UhDI  
{ d2a*xDkv  
 if(hHook!=NULL){ ki6L t  
  nHookCount++; YEPQ/Pc  
  return TRUE; zo| '  
 } -k8<LR3  
 else |ns B'Q  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ,` 64t'g  
  if(hHook!=NULL) T@%\?=P  
   nHookCount++; ?yc{@|  
  return (hHook!=NULL); v6M4KC2?  
} -^aJ}[uaI  
BOOL UnInit() [o"<DP6w  
{ ?:$\ t?e^  
 if(nHookCount>1){ , UsY0YC  
  nHookCount--; i$5<>\g  
  return TRUE; OU esL9  
 } { MV,>T_  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ?Qxf~,F  
 if(unhooked==TRUE){ FMi:2.E  
  nHookCount=0; HSk_'g(\0  
  hHook=NULL; xfa-   
 } 4`GOBX1b.y  
 return unhooked; ~NMx:PP  
} )GYnQoV4  
@tvz9N  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) g&*,j+$ }  
{ awv$ }EFo  
 BOOL bAdded=FALSE; `FGYc  
 for(int index=0;index<MAX_KEY;index++){ {sfA$ d0  
  if(hCallWnd[index]==0){ @PT([1C  
   hCallWnd[index]=hWnd; ZuFcJ?8i  
   HotKey[index]=cKey; Vak\N)=u  
   HotKeyMask[index]=cMask; 8<)ZpB,7  
   bAdded=TRUE; RY .@_{  
   KeyCount++; .He}f,!f<  
   break; ^6On^k[|fw  
  } F )Iz:  
 } @C|nc&E2s  
 return bAdded; Obf RwZh?q  
} w^"IR  
v YJ9G"E  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;_=N YG.  
{ PU,%Y_xR  
 BOOL bRemoved=FALSE; 1Q/= s,{u  
 for(int index=0;index<MAX_KEY;index++){ Kh$Q9$  
  if(hCallWnd[index]==hWnd){ E<l/o5<nC  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 3=Q:{  
    hCallWnd[index]=NULL; =%B5TBG  
    HotKey[index]=0; 6_s(Kx>j  
    HotKeyMask[index]=0; |M&4[ka}  
    bRemoved=TRUE; eaC%& k  
    KeyCount--; #;yxn.</  
    break; `*l aUn  
   } H$+@O-  
  } ,$} xPC  
 } uGv|!UQw  
 return bRemoved; {Q}F.0Q  
} L>h|1ZK  
_U_O0@xi  
void VerifyWindow() !Ii[`H  
{ hvGD`  
 for(int i=0;i<MAX_KEY;i++){ )n]" ~I^  
  if(hCallWnd!=NULL){ o1vK2V  
   if(!IsWindow(hCallWnd)){ 5X f]j=_  
    hCallWnd=NULL; q;}iW:r&Q  
    HotKey=0; Ptc+ypTu  
    HotKeyMask=0; -&COI-P8  
    KeyCount--; XEnu0 gr  
   } %q}[ZD/HD  
  } /w1M%10   
 } E.Q]X]q  
} |AH>EXhv  
:KgH7s}  
BOOL CHookApp::InitInstance() DXo]O}VF  
{ =?c""~7  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); hrm<!uKn  
 hins=AfxGetInstanceHandle(); au04F]-|j8  
 InitHotkey(); |r*)U(c`  
 return CWinApp::InitInstance(); ae2Q^yLA  
} lYTQg~aPm  
X$;&Mdo.  
int CHookApp::ExitInstance() |his8\C+x  
{ N+ak{3  
 VerifyWindow(); 8qqN0"{,  
 UnInit();  vTgx7gP  
 return CWinApp::ExitInstance(); x_ /}R3d  
} n1JtY75#,/  
XC5/$3'M&  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file AN:yL a!  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) J\Hv42  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ *i}X(sfe  
#if _MSC_VER > 1000 .L+XV y  
#pragma once (-g*U#   
#endif // _MSC_VER > 1000 Z6rhInIY  
MoE&)~0u&  
class CCaptureDlg : public CDialog tEL9hZzI  
{ veHe   
 // Construction w`;HwK$ ,  
 public: fz\Q>u'T  
  BOOL bTray; UXlZI'|He  
  BOOL bRegistered; puJB&u"4L  
  BOOL RegisterHotkey(); >v%js!`f  
  UCHAR cKey; HeO:=OE~>  
  UCHAR cMask;  kDE-GX"Y  
  void DeleteIcon(); ~\mh\a&  
  void AddIcon(); i1|>JM[V  
  UINT nCount; At"$Cu!k  
  void SaveBmp(); HT6 [Z1  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor #n'.a1R  
  // Dialog Data  v&|65[<  
  //{{AFX_DATA(CCaptureDlg) qx'0(q2Ii(  
  enum { IDD = IDD_CAPTURE_DIALOG }; c7jmzo  
  CComboBox m_Key; >;^/B R=  
  BOOL m_bControl; $8)XN-%(  
  BOOL m_bAlt; P&uSh?[ ^  
  BOOL m_bShift; )-26(aNGT  
  CString m_Path; 7IkPi?&{  
  CString m_Number; 2}A)5P*K  
  //}}AFX_DATA HMCLJ/  
  // ClassWizard generated virtual function overrides =w! ik9  
  //{{AFX_VIRTUAL(CCaptureDlg) ~x^y5[5{  
 public: Wk<fNHg  
  virtual BOOL PreTranslateMessage(MSG* pMsg); u0h%4f!X  
 protected: Td'Mc-/  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ~<?Zj  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); TIKkS*$  
  //}}AFX_VIRTUAL *3H=t$1G}  
  // Implementation _Xt/U>N  
 protected: g#=<;X2  
  HICON m_hIcon; >I|8yqbfm  
  // Generated message map functions st;iGg  
  //{{AFX_MSG(CCaptureDlg) b2OwLt9  
  virtual BOOL OnInitDialog(); b)<WC$"  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); (T_-`N|  
  afx_msg void OnPaint(); hO]F\0+  
  afx_msg HCURSOR OnQueryDragIcon(); b3^:Bh9  
  virtual void OnCancel();  yf:Vhr  
  afx_msg void OnAbout(); /[<F f  
  afx_msg void OnBrowse(); 2ZY$/  
  afx_msg void OnChange(); &em~+83  
 //}}AFX_MSG W;Y^(f  
 DECLARE_MESSAGE_MAP() M bWby'  
}; T82 `-bZ  
#endif :QGkYJ  
oFj_o  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ^e8xg=8(  
#include "stdafx.h" -K'UXoU1  
#include "Capture.h" UZI:st   
#include "CaptureDlg.h" o]q~sJVk6  
#include <windowsx.h>  u]Ku96!  
#pragma comment(lib,"hook.lib") 6sBt6?_T  
#ifdef _DEBUG mol,iM*l  
#define new DEBUG_NEW zr /v.$<  
#undef THIS_FILE A?H#bRAs  
static char THIS_FILE[] = __FILE__; Hu"$ )V  
#endif 509T?\r  
#define IDM_SHELL WM_USER+1 ]SCHni_  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^eh.Iml'@  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 7GOBb|  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; -G.N  
class CAboutDlg : public CDialog m$p}cok#+S  
{ rLsY_7!  
 public: .; F<X \_  
  CAboutDlg(); eUcb e33  
  // Dialog Data FJc8g6M  
  //{{AFX_DATA(CAboutDlg) 7|5kak>=  
  enum { IDD = IDD_ABOUTBOX }; @3.Z>KONx  
  //}}AFX_DATA uge r:cD  
  // ClassWizard generated virtual function overrides 9\4x<*  
  //{{AFX_VIRTUAL(CAboutDlg) 0]4X/u#N  
 protected: Wx:v~/r  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support I=kqkuW  
  //}}AFX_VIRTUAL O>' }q/  
  // Implementation .;4N:*hY  
 protected: !|Q&4NS  
  //{{AFX_MSG(CAboutDlg) ,<U= 7<NU  
  //}}AFX_MSG ] 0X|_bU  
  DECLARE_MESSAGE_MAP() @P7'MiP]K  
}; gD9CA*  
-TF},V~  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) l zFiZx  
{ Wq A) V,E  
 //{{AFX_DATA_INIT(CAboutDlg) K,g6y#1"  
 //}}AFX_DATA_INIT M{J>yN  
} 6TW<,SM  
] `$6=) _X  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) IU8zidn&  
{ cb^IJA9}  
 CDialog::DoDataExchange(pDX); $VmV>NZ  
 //{{AFX_DATA_MAP(CAboutDlg) e3ZRL91c  
 //}}AFX_DATA_MAP F_qApyU,7  
} rr tMd  
|HycBTN#E  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) OkciL]  
 //{{AFX_MSG_MAP(CAboutDlg) %unn{92)  
 // No message handlers lwQ!sH[M  
 //}}AFX_MSG_MAP zDdo RK@  
END_MESSAGE_MAP() t{] 6GlW  
d~aTjf  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ArtY;.cg%  
: CDialog(CCaptureDlg::IDD, pParent) 0eA <nK  
{ 4mDHAR%D  
 //{{AFX_DATA_INIT(CCaptureDlg) `j{3|C=  
  m_bControl = FALSE; 16 AlmegDk  
  m_bAlt = FALSE; > SZ95@Oh  
  m_bShift = FALSE; HIc;Lc8$  
  m_Path = _T("c:\\"); Z;uKnJh  
  m_Number = _T("0 picture captured."); zeMV_rW~  
  nCount=0; @ym:@<D  
  bRegistered=FALSE; c +]r  
  bTray=FALSE; I0F [Z\U  
 //}}AFX_DATA_INIT ~T@E")uR  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Yb5U^OjyJ  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); e8`d<U  
} x<l 5wh  
WfO EI1  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) z -?\b^  
{ ^VYR}1Mw  
 CDialog::DoDataExchange(pDX); cIO/8D#zU  
 //{{AFX_DATA_MAP(CCaptureDlg) }@bp v  
  DDX_Control(pDX, IDC_KEY, m_Key); "Erphn  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); NuO@N r  
  DDX_Check(pDX, IDC_ALT, m_bAlt); DNmC   
  DDX_Check(pDX, IDC_SHIFT, m_bShift); \Q#pu;Y*N]  
  DDX_Text(pDX, IDC_PATH, m_Path); ^6 l5@#)w  
  DDX_Text(pDX, IDC_NUMBER, m_Number); usc/DQ1  
 //}}AFX_DATA_MAP Z2W&_(^.h  
} l iY/BkpH  
@g[ijs\  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Ov(k:"N  
//{{AFX_MSG_MAP(CCaptureDlg) Xn"#Zy_  
 ON_WM_SYSCOMMAND() #b d=G(o~6  
 ON_WM_PAINT() Jj ]<SWh  
 ON_WM_QUERYDRAGICON() l3u[  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) '{,JuX"n  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) H2],auBY  
 ON_BN_CLICKED(ID_CHANGE, OnChange) `m'RvUc  
//}}AFX_MSG_MAP QHv]7&^rlj  
END_MESSAGE_MAP() qg j;E=7  
Z%?>H iy'o  
BOOL CCaptureDlg::OnInitDialog() GNW$:=0u  
{ :30daKo  
 CDialog::OnInitDialog(); w8+ phN(-M  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); d*u3]&?x&f  
 ASSERT(IDM_ABOUTBOX < 0xF000); %;wD B2k*  
 CMenu* pSysMenu = GetSystemMenu(FALSE); z/j*zU `  
 if (pSysMenu != NULL) /*g0M2+OZo  
 { `V/kM0A5  
  CString strAboutMenu; x<t ?Yc9  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 67/@J)z0%  
  if (!strAboutMenu.IsEmpty()) pp|$y\ZzB  
  { 6U).vg<  
   pSysMenu->AppendMenu(MF_SEPARATOR); MZ)lNU l  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); R UCUEo63  
  } =?CIC%6m  
 } .P8m%$'N  
 SetIcon(m_hIcon, TRUE); // Set big icon k'X"jon  
 SetIcon(m_hIcon, FALSE); // Set small icon Oh}52=  
 m_Key.SetCurSel(0); T pCXe\W  
 RegisterHotkey(); vmxS^_I  
 CMenu* pMenu=GetSystemMenu(FALSE); $m)eO8S+  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); qW3XA$g|j'  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); +^J&x>5  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); `_DA!  
 return TRUE; // return TRUE unless you set the focus to a control \HD:#a  
} 6oWFjeZ0  
|s#,^SJ0  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) t^bh2 $J  
{ 2L<1]:I  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ,wr5DQ  
 { ZHRMW'Ne  
  CAboutDlg dlgAbout; 3Q&@l49q  
  dlgAbout.DoModal(); Bz{"K  
 } /?>W\bP<  
 else )3F}IgD  
 { U7LCd+Z 5X  
  CDialog::OnSysCommand(nID, lParam); G=e'H-  
 } "Ml#,kU<T  
} ,H|K3nh  
dRs\e(H'  
void CCaptureDlg::OnPaint() # - L<  
{ Yi-,Pb?   
 if (IsIconic()) {DVMs|5;^  
 { uEsF 8  
  CPaintDC dc(this); // device context for painting 6Po {tKU  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); asW W@E  
  // Center icon in client rectangle {#t7lV'4  
  int cxIcon = GetSystemMetrics(SM_CXICON); t.!?"kP"c  
  int cyIcon = GetSystemMetrics(SM_CYICON); c*w0Jz>@.7  
  CRect rect; Nn0j}ZI)1  
  GetClientRect(&rect); s_Z5M2o  
  int x = (rect.Width() - cxIcon + 1) / 2; 1q ZnyJ  
  int y = (rect.Height() - cyIcon + 1) / 2; 6d5q<C_3t  
  // Draw the icon iOAn/[^xk  
  dc.DrawIcon(x, y, m_hIcon); 3?k<e  
 } zl, Vj%d  
 else 1Uah IePf  
 { 6XAofN/5f  
  CDialog::OnPaint(); !;t6\Z8&  
 } X&Ospl@H  
} <UIE-#  
>y!R}`&0^t  
HCURSOR CCaptureDlg::OnQueryDragIcon() >TGc0 z+  
{ )eX{a/Be  
 return (HCURSOR) m_hIcon; xxgdp. (  
} N5MWMN[6aP  
2 9z@ !  
void CCaptureDlg::OnCancel() XB[EJGaX  
{ B$q5/L$}  
 if(bTray) xyV7MW\?w  
  DeleteIcon(); xNJ*TA[+  
  CDialog::OnCancel(); nh+h3"-d  
} Ix@nRc'  
Dz$dJF1 8  
void CCaptureDlg::OnAbout() "-HWw?rx/  
{ {p$X*2ReB  
 CAboutDlg dlg; g/!tp;e  
 dlg.DoModal(); z2A,*|I  
} dM -<aq  
NwKj@Jos  
void CCaptureDlg::OnBrowse() &`g^b^i  
{ H-% B<7  
 CString str; WxJaE;`Ige  
 BROWSEINFO bi; L'e|D=y  
 char name[MAX_PATH]; Lq#!}QcW=  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); R<r,&X?m  
 bi.hwndOwner=GetSafeHwnd(); !%D;H~mQ  
 bi.pszDisplayName=name; $m-@ICG#  
 bi.lpszTitle="Select folder"; 6,l5Q  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; +}g6X6m  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Nc^:v/(P  
 if(idl==NULL) }+:X=@Z@  
  return; 7Zft]C?|@  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); @6y)wA9Yx  
 str.ReleaseBuffer(); x45F-w{  
 m_Path=str; wF-H{C'  
 if(str.GetAt(str.GetLength()-1)!='\\') H:q;IYE+a  
  m_Path+="\\"; 5z.Y}  
 UpdateData(FALSE); UD&pL'{s  
} ]~pM;6Pu0  
5IRUG)Icr  
void CCaptureDlg::SaveBmp() w,1*dn  
{ XCGK&O GI  
 CDC dc; 0Fs2* FS  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); "JgwL_2  
 CBitmap bm; r+a0.  
 int Width=GetSystemMetrics(SM_CXSCREEN); |QyZ:`0u  
 int Height=GetSystemMetrics(SM_CYSCREEN); (Kw%fJT  
 bm.CreateCompatibleBitmap(&dc,Width,Height); {P==6/<2o  
 CDC tdc; - ^>7\]  
 tdc.CreateCompatibleDC(&dc); _!yUr5&,Br  
 CBitmap*pOld=tdc.SelectObject(&bm); U_wIx  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); rwpH9\GE  
 tdc.SelectObject(pOld); :?gp}.  
 BITMAP btm; t&o&gb  
 bm.GetBitmap(&btm); %y+v0.aWH+  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; bc6|]kB:  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); &'m&'wDt:  
 BITMAPINFOHEADER bih; \XbCJJP  
 bih.biBitCount=btm.bmBitsPixel; }?6gj%$c  
 bih.biClrImportant=0; m-9ChF: U  
 bih.biClrUsed=0; m>DJ w7<  
 bih.biCompression=0; SS&G<3Ke  
 bih.biHeight=btm.bmHeight; @f#6Nu  
 bih.biPlanes=1; k4J Tc2b  
 bih.biSize=sizeof(BITMAPINFOHEADER);  fTGVG  
 bih.biSizeImage=size; .p78 \T  
 bih.biWidth=btm.bmWidth; Hr(%y&0  
 bih.biXPelsPerMeter=0; Dyj>dh-  
 bih.biYPelsPerMeter=0; +@+*sVb  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); O}z-g&e.U  
 static int filecount=0; AZ. j>+0xx  
 CString name; F{eI[A  
 name.Format("pict%04d.bmp",filecount++); VP }To  
 name=m_Path+name; A ? [Wfq|  
 BITMAPFILEHEADER bfh; [n$6 T  
 bfh.bfReserved1=bfh.bfReserved2=0; &3 x [0DV  
 bfh.bfType=((WORD)('M'<< 8)|'B'); K*tomy  
 bfh.bfSize=54+size; xE6hE'rh.O  
 bfh.bfOffBits=54; *3(mNpi{_  
 CFile bf; T?*f}J  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 5~RR _G  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); xQxq33\  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); mfk^t`w_  
  bf.WriteHuge(lpData,size); 3oApazH*  
  bf.Close(); V+$fh2t  
  nCount++; ._6Q "JAB  
 } nCLEAe$W\=  
 GlobalFreePtr(lpData); =AX"'q  
 if(nCount==1) j^mpkv<P  
  m_Number.Format("%d picture captured.",nCount); \| 'Yuh  
 else D0X!j,Kc  
  m_Number.Format("%d pictures captured.",nCount); +o K*5 Y  
  UpdateData(FALSE); 55zy]|F"  
} ? RI D4xu!  
Ime"}*9  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) PebyH"M(  
{ ~Vf A  
 if(pMsg -> message == WM_KEYDOWN) w u0q.]  
 { a6"-,Kg  
  if(pMsg -> wParam == VK_ESCAPE) $v1_M1  
   return TRUE; H ;)B5C  
  if(pMsg -> wParam == VK_RETURN) zCmx1Djz  
   return TRUE; ^K:-r !v^  
 } ,-SWrp`f  
 return CDialog::PreTranslateMessage(pMsg); |+Tq[5&R  
} ?:i,%]zxC  
lPg?Fk7AP  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) -o@L"C>   
{ Cr YPcvd6  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ?DKY;:dZF  
  SaveBmp(); xk s M e  
  return FALSE; 2k^'}7G%  
} {vp*m :K  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ [G"Va_A8  
 CMenu pop; 5Rae?* XH  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); yVyh\u\  
 CMenu*pMenu=pop.GetSubMenu(0); pL ,l  
 pMenu->SetDefaultItem(ID_EXITICON); yKC1h`2  
 CPoint pt; 1H8/b D  
 GetCursorPos(&pt); [=^Wj`;  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Yb%#\.M/y  
 if(id==ID_EXITICON) vU9:` @beu  
  DeleteIcon(); L fZF  
 else if(id==ID_EXIT) ;]W@W1)$  
  OnCancel(); pz]! T'  
 return FALSE; EvF[h:C2  
} @iN"]GFjS  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); +.QJZo_  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) N{uVh;_  
 AddIcon(); plM:7#eA  
 return res; ,OFNV|S$  
} yV*4|EkvW  
m"wP]OQH*+  
void CCaptureDlg::AddIcon() 5 &0qr$  
{ . Gb!mG  
 NOTIFYICONDATA data; Y;k iU  
 data.cbSize=sizeof(NOTIFYICONDATA); Yw_!40`  
 CString tip; ZWQ/BgKB  
 tip.LoadString(IDS_ICONTIP); E[<*Al +N  
 data.hIcon=GetIcon(0); l_Zx'm  
 data.hWnd=GetSafeHwnd(); ^ U~QQ  
 strcpy(data.szTip,tip); gmZ] E45  
 data.uCallbackMessage=IDM_SHELL; k`J|]99Wb  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 6i@* L\ Dl  
 data.uID=98; kq@~QI?9  
 Shell_NotifyIcon(NIM_ADD,&data); /dHIm`. Z  
 ShowWindow(SW_HIDE); } g%v<'K  
 bTray=TRUE; <T]ey  
} pk0{*Z?@  
^%!#Q].  
void CCaptureDlg::DeleteIcon() y2=yh30L0E  
{ G"h}6Za;DO  
 NOTIFYICONDATA data; WWATG=  
 data.cbSize=sizeof(NOTIFYICONDATA); #\\|:`YV  
 data.hWnd=GetSafeHwnd(); L[!||5y  
 data.uID=98; .AZwVP<  
 Shell_NotifyIcon(NIM_DELETE,&data); gj I>tz}  
 ShowWindow(SW_SHOW); n/S+0uT  
 SetForegroundWindow(); 8#/y`ul  
 ShowWindow(SW_SHOWNORMAL); G=|~SYz  
 bTray=FALSE; oXU b_/  
} L+}<gQJ(  
13+. >  
void CCaptureDlg::OnChange() ^!gq_x  
{ fElFyOo+  
 RegisterHotkey(); /i#";~sO  
} 2+ywl}9  
?hViOh$.  
BOOL CCaptureDlg::RegisterHotkey() [v`kqL~  
{ :aH5=@[!y  
 UpdateData(); gFsqCx<q  
 UCHAR mask=0; Eihn%Esa  
 UCHAR key=0; K D?b|y @  
 if(m_bControl) <T&v\DN  
  mask|=4; '.&Y)A6!  
 if(m_bAlt) D}Sww5ZmP  
  mask|=2; /Q_ Dd  
 if(m_bShift) <. *bJ  
  mask|=1; u08QE,  
  key=Key_Table[m_Key.GetCurSel()]; h J0U-m  
 if(bRegistered){ $tej~xZK  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); %r8;i  
  bRegistered=FALSE; g/VV2^,  
 } YrV@k*O*  
 cMask=mask; d</F6aM\  
 cKey=key; nv\K!wZI=b  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Qqs1%u;e8  
 return bRegistered; pTXF^:8  
} A0:rn\$l3  
W#=,FZT  
  四、小结 W1EYVXN  
N1B$z3E *  
  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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