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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: n~9 i^  
  )< l\jfx e  
  一、实现方法 P~o@9RV-  
6/VNuQ_#  
  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: 8~}s 3j4  
ws. ?cCTpt  
#pragma data_seg("shareddata") !W 0P `i<  
HHOOK hHook =NULL; //钩子句柄 *ZX!EjICk  
UINT nHookCount =0; //挂接的程序数目 Tln9q0"W  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 F ZM2   
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 F [r|Y-c]  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey U2VV[e)Z!  
static int KeyCount =0; (21']x  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 T4Xtuu1  
#pragma data_seg() IU7$%6<Y  
sbs[=LW4  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 v/]Qq  
-3u@hp_  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: IkiQ Ok  
P"oYC$  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR -m E  
cKey,UCHAR cMask) "[#@;{@Gt  
{ 8e]z6:}'E  
 BOOL bAdded=FALSE; &b 5T&-C<  
 for(int index=0;index<MAX_KEY;index++){ (zjz]@qJ  
  if(hCallWnd[index]==0){ @][ a8:Y9I  
   hCallWnd[index]=hWnd; lb-S0plw  
   HotKey[index]=cKey; X\o/i\ C}  
   HotKeyMask[index]=cMask; F_ ,L 2J  
   bAdded=TRUE; J'I1,5(  
   KeyCount++; P'-JbPXU  
   break; $o/0A  
  } cWgbd^J  
 } x:!C(Ep)  
 return bAdded; aQ32p4C  
} pg} ~vb"  
//删除热键 4 *Bp  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) }f<fgY  
{ A2}Z *U(;  
 BOOL bRemoved=FALSE; 6T R8D\  
 for(int index=0;index<MAX_KEY;index++){ #citwMW  
  if(hCallWnd[index]==hWnd){ 8#X?k/mzU  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 2$o2.$i81  
    hCallWnd[index]=NULL; 4w;r l(s  
    HotKey[index]=0; ~C}(\8g  
    HotKeyMask[index]=0; u@GRN`yn  
    bRemoved=TRUE; A8_\2'b  
    KeyCount--; LFk5rv'sM0  
    break; a) I=U [  
   } )ZS:gD  
  } <Cf7E  
 } ;J,,f1Vw  
 return bRemoved; [_g#x(=  
} ^q4l4)8jX  
S(g<<Te  
3Eb nZb  
  DLL中的钩子函数如下: sDzD 8as  
LV}UBao5n  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 7i-W*Mb:  
{ lU&`r:1>_  
 BOOL bProcessed=FALSE; N:UDbLjw~  
 if(HC_ACTION==nCode) C$N4   
 { q3,P|&T  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ?:#>^eWYe7  
   switch(wParam) n.Ur-ot  
   {  '_TJ"lOZ  
    case VK_MENU: vSyi}5D  
     MaskBits&=~ALTBIT; J[<D/WIH  
     break; eHF(,JI  
    case VK_CONTROL: 1+16i=BF)  
     MaskBits&=~CTRLBIT; X]+(c_i:hC  
     break; ?1-n\ka  
    case VK_SHIFT: o+if%3  
     MaskBits&=~SHIFTBIT; :=iM$_tp'  
     break; Ovl?j&8  
    default: //judge the key and send message C$AIP\j- )  
     break; h+zkVRyA  
   } =u:6b} =  
   for(int index=0;index<MAX_KEY;index++){ *6sJ*lh  
    if(hCallWnd[index]==NULL) 6]@|7|N>X  
     continue; RAD4q"}k  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8 ACY uN\  
    { @MlU!oR&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); OIXAjU*N  
     bProcessed=TRUE; 7(|3 OR+  
    } lt2Nwt0bv  
   } ZVL- o<6  
  } ^?K?\   
  else if((lParam&0xc000ffff)==1){ //有键按下 n&3iv ^  
   switch(wParam) JucxhjV#,  
   { \ ]kb&Qw  
    case VK_MENU: f@F^W YQm  
     MaskBits|=ALTBIT; Oc"'ay(g  
     break; jOm&yX  
    case VK_CONTROL: <mo^Y k3  
     MaskBits|=CTRLBIT; oQ-|\?{;A  
     break; '^-4{Y^2E  
    case VK_SHIFT: SqA+u/"j2  
     MaskBits|=SHIFTBIT; @8Q+=abz  
     break; +SuUI-.  
    default: //judge the key and send message Mc$v~|i6  
     break; lU50.7<08  
   } %)6 :eIS  
   for(int index=0;index<MAX_KEY;index++){ |bG[TOa  
    if(hCallWnd[index]==NULL) 1 <qVN'[  
     continue; =:n[{/O=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) qK6  uU9z  
    { '+q'H  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); I 3zitI;  
     bProcessed=TRUE; Ti@P4:q  
    } /m{?o  
   } ?/l}(t$H  
  } &PQ{e8w  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 1z};"A  
   for(int index=0;index<MAX_KEY;index++){ .J6 j"  
    if(hCallWnd[index]==NULL) ^qzT5W\@  
     continue; <>*''^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) _9O }d  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); <T.3ZZ%  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 :J4C'N  
   } IrwF B  
  } A$"$`)P!  
 } m1$P3tZPn  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); -_4jJxh=OB  
} n%ArA])_&  
7jg(j~tQ  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 98%tws`  
%{VI-CQ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); +$mskj0s  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Mn\ B\  
?e_}X3{  
  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: 2|NyAtPb5  
1yRd10  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 9B;Sk]y  
{ D>x'3WYR  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) .HyiPx3^  
 { o(SJuZC/U  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 W%XS0k}x  
  SaveBmp(); dv9Pb5i  
  return FALSE; w>q_8V_K  
 } MLIQ 8=  
 …… //其它处理及默认处理 Di1G  
} m}'@S+k^  
1H[;7@o$e  
.6/p4OR|  
  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。 >E,L"&_j  
_ktSTzH0  
  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。 i\z0{;f|GX  
*U^I `j[u  
  二、编程步骤 !<PTsk F  
;Wh[q*A  
  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"; n2hsG.4  
_,?HrL9  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; E|uXi)!.x  
VM|)\?Q  
  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; cWy0N  
KQZRzX>0  
  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; %|* y/m  
C)^\?DH  
  5、 添加代码,编译运行程序。 {Om3fSk:  
5e8-?w% e  
三、程序代码 2}\sj'0&  
F7Yuky  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL  D.x3@+  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) a#Gq J?nY  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ +Ws}a  
#if _MSC_VER > 1000 JJOs L!@  
#pragma once .@Sh,^v  
#endif // _MSC_VER > 1000 xT( .#9  
#ifndef __AFXWIN_H__ {"(|oIo{  
#error include 'stdafx.h' before including this file for PCH JkEQ@x  
#endif [~JN n  
#include "resource.h" // main symbols '~=xP  
class CHookApp : public CWinApp V0B4<TTAo~  
{ jo:p*Q "F  
 public: n{* [Y  
  CHookApp(); sW`iXsbWM>  
  // Overrides ~i {)J  
  // ClassWizard generated virtual function overrides ?Ir6*ZyY  
  //{{AFX_VIRTUAL(CHookApp) $jL.TraV7  
 public: kQcQi}e  
  virtual BOOL InitInstance(); \05C'z3]  
  virtual int ExitInstance(); j+v)I=  
  //}}AFX_VIRTUAL lsxii-#O  
  //{{AFX_MSG(CHookApp) sA j$U^Gp  
  // NOTE - the ClassWizard will add and remove member functions here. :9>nY  
  // DO NOT EDIT what you see in these blocks of generated code ! xBd% e-r  
  //}}AFX_MSG , >6X_XJQ  
  DECLARE_MESSAGE_MAP() O$\N]#  
}; @72G*u\Wz  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); M QI=  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8;bOw  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ";%1sK  
BOOL InitHotkey(); 4^A'A.0  
BOOL UnInit(); oOw"k*,h:S  
#endif o{eG6  
HKf3eC  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ,s<d"]<  
#include "stdafx.h" p_5+L@%Gb  
#include "hook.h" m{" zFD/  
#include <windowsx.h> zj}efv<e  
#ifdef _DEBUG /$Jh5Bv  
#define new DEBUG_NEW i;7jJ(#V  
#undef THIS_FILE ^B>6 !  
static char THIS_FILE[] = __FILE__; ;* Jd#O  
#endif A#{*A  
#define MAX_KEY 100 ul1Vsj  
#define CTRLBIT 0x04 Z7/lFS'~N  
#define ALTBIT 0x02 ?z.`rD$}(n  
#define SHIFTBIT 0x01 1,,:4 *)  
#pragma data_seg("shareddata") _7VU ,  
HHOOK hHook =NULL; A1@a:P=  
UINT nHookCount =0; \qPrY.-  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey G{9y`;  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT [&&4lKC}u  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey %r!-*p<i|  
static int KeyCount =0; s4\2lBU?  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift QS_xOQ '  
#pragma data_seg() }#@LZ)]hK  
HINSTANCE hins; 2TO1i0  
void VerifyWindow(); N_U D7P1  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) j  jQ=  
//{{AFX_MSG_MAP(CHookApp) *%.*vPJ  
// NOTE - the ClassWizard will add and remove mapping macros here. dcsd//E  
// DO NOT EDIT what you see in these blocks of generated code! 92R{V%)G  
//}}AFX_MSG_MAP Z(cgI5Pu  
END_MESSAGE_MAP() m"5gzH  
}0o0"J-$  
CHookApp::CHookApp() {[eY/)6H  
{ qp8;=Nfa  
 // TODO: add construction code here, gvX7+F=}B  
 // Place all significant initialization in InitInstance OmW|\d PU  
} }_S]!AWz  
"lm3o(Dk  
CHookApp theApp; fQ@["b   
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) G!uxpZ   
{ H'0S;A+Y6  
 BOOL bProcessed=FALSE; 2zAS \Y  
 if(HC_ACTION==nCode) E;SF f  
 { R[6&{&E:  
  if((lParam&0xc0000000)==0xc0000000){// Key up W NCdk$  
   switch(wParam) ]#;JPO#*  
   { &e{&<ZVR  
    case VK_MENU: :DEZ$gi  
     MaskBits&=~ALTBIT; = 619+[fK  
     break; <?!#QA  
    case VK_CONTROL: b=sc2 )3?  
     MaskBits&=~CTRLBIT; t_3XqjuA  
     break; V@F~Cx  
    case VK_SHIFT: nX~sVG{Q  
     MaskBits&=~SHIFTBIT; )Fbkt(1  
     break; &WIPz\  
    default: //judge the key and send message ]Kd:ZmJ  
     break; Ha<(~qf  
   } D`+'#%%x  
   for(int index=0;index<MAX_KEY;index++){ -LF^u;s8&S  
    if(hCallWnd[index]==NULL) 6D>o(b2  
     continue; +=*ZH `qX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) i;cqK&P;]  
    { B<W{kEY  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); \ /o`CV{O  
     bProcessed=TRUE; ;Q ]bV52  
    } nlKWZYv  
   } n@xU5Q  
  } Bb m1&d#  
  else if((lParam&0xc000ffff)==1){ //Key down Rh%x5RFFc  
   switch(wParam) SJL?(S*  
   { /" ,]J  
    case VK_MENU: mZmwCS8  
     MaskBits|=ALTBIT; A@GyKx%x$  
     break; mN, Od?q[  
    case VK_CONTROL: f>dWl$/_s  
     MaskBits|=CTRLBIT; M Su_*&j9T  
     break; S?&ntUah  
    case VK_SHIFT:  \:Q)Ef  
     MaskBits|=SHIFTBIT; 'z@(,5  
     break; =MA$xz3  
    default: //judge the key and send message , j7&(V~  
     break; Go8 m  
   } XK>B mq/]  
   for(int index=0;index<MAX_KEY;index++) Que-  
   { 7aS`S F  
    if(hCallWnd[index]==NULL) cZi/bIh  
     continue; Bf.@B0\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) D >$9(  
    { ><+wHb  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); qh{hpX)\D  
     bProcessed=TRUE; /g@!#Dt  
    } y\]:&)?&C^  
   } 7xqTTN6h  
  } NvY%sx,  
  if(!bProcessed){ g,*LP  
   for(int index=0;index<MAX_KEY;index++){ G[GSt`LVS`  
    if(hCallWnd[index]==NULL) w,n&K6<  
     continue; R^4JM,v9x`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) eh`n?C  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); F[5[@y  
   } M|xd9kA^  
  } [f 4Nq \i  
 } rE)lt0mkv  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); hV_bm@f/y  
} VXX7Y? !  
k  <SFl  
BOOL InitHotkey() 1ayL*tr  
{ = wEU+R_#o  
 if(hHook!=NULL){ SHWD@WLE4  
  nHookCount++; F/}(FG<'>I  
  return TRUE; h'%iY6!fA  
 } /r2*le (H  
 else ?QR13l(  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 3HCH-?U5  
  if(hHook!=NULL) R<]f[  
   nHookCount++; ?o$ hlX  
  return (hHook!=NULL); w8~B@}%  
} TuR.'kE@  
BOOL UnInit() , !0-;H.Y  
{ IHC {2 ^  
 if(nHookCount>1){ O7,)#{  
  nHookCount--; PLoD^3uG)  
  return TRUE; n3x< L:)  
 } Ry_"sow4  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ol#| .a2O  
 if(unhooked==TRUE){ ZE393FnE  
  nHookCount=0; :$ qa  
  hHook=NULL; 9IfeaoZZ4q  
 } {zhajY7  
 return unhooked; >_esLsPWh]  
} }:SWgPfc  
C[c^zn  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) J A!?vs  
{ iC(&U YL  
 BOOL bAdded=FALSE; %0&c0vT  
 for(int index=0;index<MAX_KEY;index++){ MVDEVq0  
  if(hCallWnd[index]==0){ ;Gnk8lIsb  
   hCallWnd[index]=hWnd; mssCnr;  
   HotKey[index]=cKey; o!$O+%4  
   HotKeyMask[index]=cMask; &[#iM0;)W0  
   bAdded=TRUE; /u&{=nU  
   KeyCount++; <36z,[,kZ@  
   break; 25R6>CXsi  
  } |g)/6jG<-  
 } 5oOF|IYi  
 return bAdded; <4Ev3z*;Z  
} glL.CkJ  
JnodDH ?  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) M dKkj[#  
{ |K(j XZ)  
 BOOL bRemoved=FALSE; <h"07.y  
 for(int index=0;index<MAX_KEY;index++){ Yt3 +o<  
  if(hCallWnd[index]==hWnd){ =CqZ$  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Fi3k  
    hCallWnd[index]=NULL; IVY{N/ 3|  
    HotKey[index]=0; 6C@W6DR3N  
    HotKeyMask[index]=0; 0YsBAfRG  
    bRemoved=TRUE; I%?ia5]H  
    KeyCount--; Bj1{=Pvl  
    break; +!6dsnr8  
   } u&-Zh@;Q7  
  } Kf>]M|G c  
 } qZ=%r u  
 return bRemoved; ;}W-9=81  
} C]01(UoSZ  
]/cVlpZ{f  
void VerifyWindow() ZvVrbj&  
{ kD?lMA__  
 for(int i=0;i<MAX_KEY;i++){ oU[>.Igi  
  if(hCallWnd!=NULL){ Ho!dtEs  
   if(!IsWindow(hCallWnd)){ ^hyY,X  
    hCallWnd=NULL; 6 {j}Z*)m  
    HotKey=0; r@)_>(  
    HotKeyMask=0; :=cZ,?PQp1  
    KeyCount--; /&jh10}H  
   } }@Dgr)*+  
  } sgxD5xj}4  
 } w$fP$ \+  
} -:]-g:;/  
xp68-&  
BOOL CHookApp::InitInstance() g q|]t<'  
{ @b@#  o  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); E(p*B8d  
 hins=AfxGetInstanceHandle(); 9esMr0*=  
 InitHotkey(); 1[U`,(C1  
 return CWinApp::InitInstance(); ]Te,m}E  
} D.;iz>_}Y  
A^3M~  
int CHookApp::ExitInstance() f8JWg9 m  
{ |08'd5  
 VerifyWindow(); q y\Z2k  
 UnInit(); kWW$*d$  
 return CWinApp::ExitInstance(); E/5/5'gBJO  
} [5T{`&  
8?z7!k]  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file &4}Uaxt)  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) gAxf5 A_x)  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ |%~Zo:Q<$>  
#if _MSC_VER > 1000 [,?5}'we  
#pragma once *k^'xL  
#endif // _MSC_VER > 1000 d:&=|kKw  
p?idl`?^3  
class CCaptureDlg : public CDialog -qNun3  
{ 2b89th  
 // Construction JC#M,j2  
 public: >Y 8\I  
  BOOL bTray; FA7q pc  
  BOOL bRegistered; :rzq[J^  
  BOOL RegisterHotkey(); 2, R5mL$  
  UCHAR cKey; s1kG:h2|$  
  UCHAR cMask; H$4 4,8,m  
  void DeleteIcon(); Q XLHQ_V  
  void AddIcon(); gT0N\oU"  
  UINT nCount; eJ3;Sd''  
  void SaveBmp(); 1wTPT,k  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor LAjreC<W  
  // Dialog Data <%b a 3<sg  
  //{{AFX_DATA(CCaptureDlg) <4%cKW0  
  enum { IDD = IDD_CAPTURE_DIALOG }; !E.CpfaC  
  CComboBox m_Key; dK d"2+fH  
  BOOL m_bControl; 6i7+.#s  
  BOOL m_bAlt; $ts1XIK%  
  BOOL m_bShift; ~`Rb"Zn  
  CString m_Path; Mo4k6@ht_  
  CString m_Number; !HCuae3_  
  //}}AFX_DATA zkb[u"  
  // ClassWizard generated virtual function overrides efX iZ  
  //{{AFX_VIRTUAL(CCaptureDlg) R^k)^!/$f  
 public: S!6 ? b5  
  virtual BOOL PreTranslateMessage(MSG* pMsg); S17 c#6vT  
 protected: X')t6DQ(I  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support F!qt=)V@w  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 7 <<`9,  
  //}}AFX_VIRTUAL oa<%R8T?@  
  // Implementation 9YEE.=]T  
 protected: \ Dccf_(Pb  
  HICON m_hIcon; ?,  m_q+  
  // Generated message map functions /|LQ?n  
  //{{AFX_MSG(CCaptureDlg) Qr9@e Q1Pp  
  virtual BOOL OnInitDialog(); K*9~ g('  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); %}[/lIxaE  
  afx_msg void OnPaint(); o>75s#= b=  
  afx_msg HCURSOR OnQueryDragIcon(); f~ P~%  
  virtual void OnCancel(); 3{H&{@Q  
  afx_msg void OnAbout(); _ZHDr[  
  afx_msg void OnBrowse(); x%`tWE|  
  afx_msg void OnChange(); rk8Cea  
 //}}AFX_MSG ,R[<+!RS  
 DECLARE_MESSAGE_MAP() HyY ol*  
}; Vu5Djx'  
#endif bR*} s/  
+HkEbR'G0  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file I' 'X\/|  
#include "stdafx.h" ?%ei+  
#include "Capture.h" FM,o&0HSd  
#include "CaptureDlg.h" zT+ "Z(oz,  
#include <windowsx.h> e !N%   
#pragma comment(lib,"hook.lib") 2Kz407|'  
#ifdef _DEBUG fRK=y+gl@  
#define new DEBUG_NEW (Qd@Q,@(s  
#undef THIS_FILE yi:1cLq2  
static char THIS_FILE[] = __FILE__; k2:mIp\  
#endif M,sZ8eeq  
#define IDM_SHELL WM_USER+1 }e-D&U  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Nn{/_QG  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); $ E-c%-  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; F0KNkL>&g  
class CAboutDlg : public CDialog R47tg&k6[  
{ K`8$+JDP+  
 public: p+}eP|N  
  CAboutDlg(); $g  '4'  
  // Dialog Data <(_${zR  
  //{{AFX_DATA(CAboutDlg) GzjC;+W  
  enum { IDD = IDD_ABOUTBOX }; LX</xI08W  
  //}}AFX_DATA Xu& v3Y~k  
  // ClassWizard generated virtual function overrides '@f#GNRT  
  //{{AFX_VIRTUAL(CAboutDlg) C^ZD Uj`  
 protected: CGs5`a  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support b5?k)s2  
  //}}AFX_VIRTUAL ;"]?&ri  
  // Implementation @vPGkM#oW  
 protected: 9d8U@=  
  //{{AFX_MSG(CAboutDlg) pykRi#[UrX  
  //}}AFX_MSG `o6T)49  
  DECLARE_MESSAGE_MAP() @!mjjeG+1  
}; >=YQxm}GJ  
T#ehJq 5  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) eb7~\|9l1i  
{ e!P]$em|1E  
 //{{AFX_DATA_INIT(CAboutDlg) r?}L^bK  
 //}}AFX_DATA_INIT &?M'(` ~  
} +?+iVLr!l}  
S<>u  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) @pV&{Vp  
{ ]?V2L`/  
 CDialog::DoDataExchange(pDX); w C-x'  
 //{{AFX_DATA_MAP(CAboutDlg) dwz {Yw(  
 //}}AFX_DATA_MAP p1fy)K2{,j  
} {oRR]>  
K!;>/3Y2-  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ;c|G  
 //{{AFX_MSG_MAP(CAboutDlg) 2qPQ3-'  
 // No message handlers ^vc#)tm5p  
 //}}AFX_MSG_MAP 0]2@T=*kTY  
END_MESSAGE_MAP() (z^9 87G  
6Lz:J:Q)  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) dgW/5g  
: CDialog(CCaptureDlg::IDD, pParent) ya'OI P `  
{ { u1\M  
 //{{AFX_DATA_INIT(CCaptureDlg)  S/Gy:GIf  
  m_bControl = FALSE; v Yw$m#@  
  m_bAlt = FALSE; N>',[4pJ|  
  m_bShift = FALSE; OB\jq!"  
  m_Path = _T("c:\\"); *+>QKR7  
  m_Number = _T("0 picture captured."); B/b S:  
  nCount=0; |"k+j_/+  
  bRegistered=FALSE; z>O=. Ku6  
  bTray=FALSE; i`EG80\[Z  
 //}}AFX_DATA_INIT qm|T<zsDY#  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Q#sLIZ8=  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); |v= */e  
} at5=Zo[bP  
j(];b+>  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 0uS6F8x@  
{ mY!&*nYn|  
 CDialog::DoDataExchange(pDX); Lb%:u5X\D@  
 //{{AFX_DATA_MAP(CCaptureDlg) Un{9reX5  
  DDX_Control(pDX, IDC_KEY, m_Key); gshgl3   
  DDX_Check(pDX, IDC_CONTROL, m_bControl); xJF}6yPm@  
  DDX_Check(pDX, IDC_ALT, m_bAlt); {%XDr,myd  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); rWxQ;bb#  
  DDX_Text(pDX, IDC_PATH, m_Path); 4'U #<8  
  DDX_Text(pDX, IDC_NUMBER, m_Number); p^9u8T4l1  
 //}}AFX_DATA_MAP VTwJtWnq  
} Fq #;  
F!~oJ  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) KPB^>,T2{  
//{{AFX_MSG_MAP(CCaptureDlg) =aJb}X  
 ON_WM_SYSCOMMAND() z*OQ4_  
 ON_WM_PAINT() 3NxwQ,~  
 ON_WM_QUERYDRAGICON() -`} d@x  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) z.]  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ew\ZFqA;  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 0ZjinWkR[  
//}}AFX_MSG_MAP .lIkJQ3d  
END_MESSAGE_MAP() 7&{[Y^R]"  
3Fl!pq]  
BOOL CCaptureDlg::OnInitDialog() ;_?RPWZ;MO  
{ K9+%rqC.|`  
 CDialog::OnInitDialog(); dMjAG7U  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 7S)u7  
 ASSERT(IDM_ABOUTBOX < 0xF000); kSH|+K\M4  
 CMenu* pSysMenu = GetSystemMenu(FALSE); {G(N vf,K]  
 if (pSysMenu != NULL) vILq5iR  
 { 3( `NHS~h  
  CString strAboutMenu; `w/`qG:dK  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 3F|#nq  
  if (!strAboutMenu.IsEmpty()) !;~6nYY  
  { X!ad~bt  
   pSysMenu->AppendMenu(MF_SEPARATOR); 9_<>#)u5  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); .iXI oka  
  } n*vzp?+Y  
 } 6 s1lf!  
 SetIcon(m_hIcon, TRUE); // Set big icon !e0~|8  
 SetIcon(m_hIcon, FALSE); // Set small icon KG8Km  
 m_Key.SetCurSel(0); MW$ X4<*KD  
 RegisterHotkey(); Zcg@]Sx(I  
 CMenu* pMenu=GetSystemMenu(FALSE); yPhTCr5pK  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); m C &*K  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ?7"6d p_K  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); {e'V^l.v  
 return TRUE; // return TRUE unless you set the focus to a control '#p2v'A  
} %an&lcoX  
}Uc)iNU  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) (np60mX<  
{ @XR N#_{  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 5fqQ;r  
 {  YD|;xuh  
  CAboutDlg dlgAbout; L?slIGp%-  
  dlgAbout.DoModal(); ROc)LCA  
 } / >q?H)6  
 else [~#]p9|L  
 { s2rwFj8 |  
  CDialog::OnSysCommand(nID, lParam); wW?/`>@  
 } "fTW2D74  
} >azTAX6L3  
c^ifHCt|  
void CCaptureDlg::OnPaint() ltH?Ew<]  
{ jj$D6f/mOG  
 if (IsIconic()) g=5vnY  
 { [9U: :  
  CPaintDC dc(this); // device context for painting |MQ_VZ{6  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); WMw^zq?hd@  
  // Center icon in client rectangle y6C3u5`  
  int cxIcon = GetSystemMetrics(SM_CXICON); C0> Z<z  
  int cyIcon = GetSystemMetrics(SM_CYICON); ^;@Q3~DpP%  
  CRect rect; l k?@ =U~  
  GetClientRect(&rect); N&]GP l0  
  int x = (rect.Width() - cxIcon + 1) / 2; lUJ~_`D  
  int y = (rect.Height() - cyIcon + 1) / 2; Z\9DtvV  
  // Draw the icon n 9X:s?B/  
  dc.DrawIcon(x, y, m_hIcon); Je1'0h9d  
 } vl,Ff9  
 else Q]v><  
 { E[8R )xC@  
  CDialog::OnPaint(); gXP)YN  
 } FT$Z8  
} 41Nm+$m  
ys~oJb~  
HCURSOR CCaptureDlg::OnQueryDragIcon() []I _r=  
{ 3 J!J#  
 return (HCURSOR) m_hIcon; ^0fe:ac;  
} b\9MM  
8v V<A*`  
void CCaptureDlg::OnCancel() lc8zF5  
{ ["65\GI?  
 if(bTray) u4QBD5T"  
  DeleteIcon(); $ctpg9 7  
  CDialog::OnCancel(); ZK p9k6  
} L7rH=gZ&!]  
A]_5O8<buW  
void CCaptureDlg::OnAbout() ucwUeRw,  
{ VTIRkC wl@  
 CAboutDlg dlg; }xG~ a=,  
 dlg.DoModal(); PC55A1(T  
} kmZ  U;Z  
|J:kL3g  
void CCaptureDlg::OnBrowse() u`~,`z^{n  
{ kX8Ey  
 CString str; l/6$BP U`  
 BROWSEINFO bi; NS3qNj  
 char name[MAX_PATH]; (\o &Gl  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 9J4gDw4<  
 bi.hwndOwner=GetSafeHwnd(); {wwkbc*  
 bi.pszDisplayName=name; u|EHe"V"  
 bi.lpszTitle="Select folder"; |:b!e  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; +txHj(Y`  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); R^+,D  
 if(idl==NULL) G+V?c1Me  
  return; ToE^%J4  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); j3&tXZ;F  
 str.ReleaseBuffer(); %XiF7<A &  
 m_Path=str; :vo#(  
 if(str.GetAt(str.GetLength()-1)!='\\') g7@.Fa.u'!  
  m_Path+="\\"; w3E#v&"=Y  
 UpdateData(FALSE); ;oGpB#[zO  
} ''3b[<  
9~ r YLR(v  
void CCaptureDlg::SaveBmp() fj:q_P67o  
{ SsfHp  
 CDC dc; (_Ky' .  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); e{E8_2d  
 CBitmap bm; TJ+,G4z  
 int Width=GetSystemMetrics(SM_CXSCREEN); u1) #^?  
 int Height=GetSystemMetrics(SM_CYSCREEN); Su*f`~G];  
 bm.CreateCompatibleBitmap(&dc,Width,Height); >))K%\p   
 CDC tdc; r";;Fk#5  
 tdc.CreateCompatibleDC(&dc); ZMGthI}~-  
 CBitmap*pOld=tdc.SelectObject(&bm); owKOH{otf  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); w7`09oJm  
 tdc.SelectObject(pOld); kH">(f  
 BITMAP btm; {2=f,,|+f  
 bm.GetBitmap(&btm); ? uu,w  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; U C..)9  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); =.\PG [  
 BITMAPINFOHEADER bih; C|-QU  
 bih.biBitCount=btm.bmBitsPixel; 0.z\YTZ9  
 bih.biClrImportant=0; Y@2v/O,\  
 bih.biClrUsed=0; K6G+sBw[  
 bih.biCompression=0; @G?R (  
 bih.biHeight=btm.bmHeight; 3fd?xhWbN  
 bih.biPlanes=1; Mi:i1i cdn  
 bih.biSize=sizeof(BITMAPINFOHEADER); Ck>{7 Gw  
 bih.biSizeImage=size; ?AYb@&%  
 bih.biWidth=btm.bmWidth; cllnYvr3  
 bih.biXPelsPerMeter=0; 0+3{fD/  
 bih.biYPelsPerMeter=0; a2SXg A  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); O%*:fd,o-  
 static int filecount=0; BI:O?!:9)  
 CString name; e!oL!Zg  
 name.Format("pict%04d.bmp",filecount++); M+GtUE~"  
 name=m_Path+name; +~\1g^h  
 BITMAPFILEHEADER bfh; cxpG6c  
 bfh.bfReserved1=bfh.bfReserved2=0; EWK?vs  
 bfh.bfType=((WORD)('M'<< 8)|'B'); aK?PK }@  
 bfh.bfSize=54+size; h%8C_m A  
 bfh.bfOffBits=54;  s4vj  
 CFile bf; |oX1J<LM  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ; fxrOfb  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); %6cbHH  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); \W+Hzf] W#  
  bf.WriteHuge(lpData,size); .Zm de*b  
  bf.Close(); }dpE>  
  nCount++; K8 Hj)$E61  
 } N?><%fra  
 GlobalFreePtr(lpData); I]6,hygs  
 if(nCount==1) Zy=DY  
  m_Number.Format("%d picture captured.",nCount); 6!Uk c'r  
 else r:--DKt  
  m_Number.Format("%d pictures captured.",nCount); NuR3]Ja\0  
  UpdateData(FALSE); &x)nK  
} EpB3s{B"  
~ugH2jiB  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Rh%C$d(  
{ L3Ivm :  
 if(pMsg -> message == WM_KEYDOWN) BE)&.}l  
 { ,*Wp$  
  if(pMsg -> wParam == VK_ESCAPE) 349BQ5ND  
   return TRUE; ~mC>G 4y$a  
  if(pMsg -> wParam == VK_RETURN) B_S))3   
   return TRUE; " 1%\Fil  
 } |>Pz#DCy  
 return CDialog::PreTranslateMessage(pMsg); "GX k;Y  
} @nOuFX4  
[BKOK7QK|  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) fU|4^p)  
{ gdkHaLL"  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ -%TwtO<$']  
  SaveBmp(); qJ[wVNHh!  
  return FALSE; ~toR)=Yv  
} A9y@v{txN  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ %J+k.UrM  
 CMenu pop; &neB$m3y  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); L~*nI d  
 CMenu*pMenu=pop.GetSubMenu(0); 5? *Iaw  
 pMenu->SetDefaultItem(ID_EXITICON); <vd}oiB@  
 CPoint pt; J3hhh(  
 GetCursorPos(&pt); 6W9lKD_i  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); _7<G6q2(  
 if(id==ID_EXITICON) y\Wp} }  
  DeleteIcon(); B$MHn?  
 else if(id==ID_EXIT) WF-^pfRq~  
  OnCancel(); # blh9.V&F  
 return FALSE; vHN/~k#  
} nPhREn!  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Y mm*p,`  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) rge s`&0  
 AddIcon(); ]L?WC  
 return res; b6g/SIae  
} e#@u&+K/f  
'![VA8  
void CCaptureDlg::AddIcon() 2{S*$K[M  
{ j]m|}n  
 NOTIFYICONDATA data; @B9#Hrc  
 data.cbSize=sizeof(NOTIFYICONDATA); n<Ki.;-ZE  
 CString tip; O^IS:\JX&  
 tip.LoadString(IDS_ICONTIP); P_(< ?0l  
 data.hIcon=GetIcon(0); g_)i)V  
 data.hWnd=GetSafeHwnd(); gF\ac%9  
 strcpy(data.szTip,tip); EUS^Gtc  
 data.uCallbackMessage=IDM_SHELL; 1-PFM-  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; $YK~7!!  
 data.uID=98; A+VzpJ~  
 Shell_NotifyIcon(NIM_ADD,&data); t![972.&  
 ShowWindow(SW_HIDE); =cxG4R1x  
 bTray=TRUE; n"<'F4r  
} TSj)XU {W  
@}{Fw;,(7n  
void CCaptureDlg::DeleteIcon() >Sm#-4B-  
{ soqnr" 1  
 NOTIFYICONDATA data; }R`}Ey|{  
 data.cbSize=sizeof(NOTIFYICONDATA); iBCIJ!;  
 data.hWnd=GetSafeHwnd(); 9HAK  
 data.uID=98; X:W}S/  
 Shell_NotifyIcon(NIM_DELETE,&data); !%QbE[Kl>  
 ShowWindow(SW_SHOW); '>>@I~<\  
 SetForegroundWindow(); kp*BAQ  
 ShowWindow(SW_SHOWNORMAL); $B`bsJ  
 bTray=FALSE; uR82},r$m  
} [H>/N7v19*  
i>;6Z s>S  
void CCaptureDlg::OnChange() Q]-r'pYr  
{ HK<oNr.d52  
 RegisterHotkey(); !De U8.%  
} D$SO 6X~  
>u=nGeO  
BOOL CCaptureDlg::RegisterHotkey() {>l`P{{y  
{ g= s2t"&  
 UpdateData(); EZ^M?awB4  
 UCHAR mask=0; <@=w4\5j9  
 UCHAR key=0; yj9 Ad*.  
 if(m_bControl) AI2>{V  
  mask|=4; k? =_p6>  
 if(m_bAlt) iD2>-yf  
  mask|=2; ni3A+Y0  
 if(m_bShift) b!g8NG  
  mask|=1; .,SWa;[iB  
  key=Key_Table[m_Key.GetCurSel()]; ooT~R2u  
 if(bRegistered){ ]yA_N>k2K  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 6}PoBhgSg-  
  bRegistered=FALSE; D]d2opBLj  
 } YCNpJGM  
 cMask=mask; BU;E6s>P  
 cKey=key; eh$T 3_#q  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ~kPZh1n`  
 return bRegistered; `d:cq.OO  
} }L|XZL_Jo#  
y?{YQ)fj  
  四、小结 Q?W}]RW  
JKs&!!  
  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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