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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: ANNfL9:Jy  
   PK#; \Zw  
  一、实现方法 _7(>0GY  
aHosu=NK  
  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: Ctpr.  
#%4-zNS  
#pragma data_seg("shareddata") #{)=%5=c  
HHOOK hHook =NULL; //钩子句柄 =} Np0UP  
UINT nHookCount =0; //挂接的程序数目 2f8fA'|O  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 `B{N3Kxbp  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 wf!?'*  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ^zv0hGk2  
static int KeyCount =0; ?lJm}0>  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 KLW#+vZ  
#pragma data_seg() 7q>WO  
HhN;&67~Z  
  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。 .'md `@t  
p/|]])2  
  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: ozZW7dveU  
%oas IiO  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 'u }|~u?m  
cKey,UCHAR cMask) SomA`y+ERn  
{ F V8K_xj  
 BOOL bAdded=FALSE; sW[8f Z71  
 for(int index=0;index<MAX_KEY;index++){ *{t{/^'y  
  if(hCallWnd[index]==0){ =v-BzF15  
   hCallWnd[index]=hWnd; m}\G.$h4  
   HotKey[index]=cKey; p2N;-  
   HotKeyMask[index]=cMask; D2o,K&V  
   bAdded=TRUE; 3fJ GJW!zu  
   KeyCount++; f>k<I[C<  
   break; d'~ kf#  
  } pqmS w  
 } 5;wA7@  
 return bAdded; 3okh'P%+  
} #9Z\jW6b  
//删除热键 gF( aYuk  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) MA\"JAP/  
{ .CI { g2  
 BOOL bRemoved=FALSE; q@K;u[zFK  
 for(int index=0;index<MAX_KEY;index++){ rPVz !(;k  
  if(hCallWnd[index]==hWnd){ p\]Mf#B  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ;Wa4d`K  
    hCallWnd[index]=NULL; aZt5/|B  
    HotKey[index]=0; VG*Tdaua~  
    HotKeyMask[index]=0; C~PrIM?  
    bRemoved=TRUE; }D_h*9  
    KeyCount--; ~|e?@3_G  
    break; 3+mC96wN  
   } OOy]:t4 /  
  } ~Zbr7zVn  
 } J0 BA@jH5  
 return bRemoved; %$/t`'&o-  
} QiB ^U^f  
q:4 51C  
6 /^$SWd2  
  DLL中的钩子函数如下: iaAVGgA9+  
0 e 1W&  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 8?ldD  
{ Mg? ^5`*  
 BOOL bProcessed=FALSE; cn&\q.!fh  
 if(HC_ACTION==nCode) ">vxYi  
 { !+tz<9BBY  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 4.|-?qG  
   switch(wParam) j4j %r(  
   {  QXZjsa_|  
    case VK_MENU: T#'+w@Q9{9  
     MaskBits&=~ALTBIT; FB {4& ;  
     break; 9%e& Z'l  
    case VK_CONTROL: >S4klW=*I  
     MaskBits&=~CTRLBIT; %Q:i6 ~  
     break; LaL.C^K  
    case VK_SHIFT: o7"2"( =>  
     MaskBits&=~SHIFTBIT; [MfKBlA  
     break; DC4,*a~  
    default: //judge the key and send message ?4%'6R  
     break; PjriAlxD  
   } ea-NqdGs;m  
   for(int index=0;index<MAX_KEY;index++){ .v<c_~y  
    if(hCallWnd[index]==NULL) nQ4s  
     continue; @!z9.o;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) VT1Nd  
    { M`!\$D  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); x&qC~F*QR%  
     bProcessed=TRUE; Jolr"F?  
    } rYUhGmg`  
   } ^:g8mt  
  } U$o\?4  
  else if((lParam&0xc000ffff)==1){ //有键按下 %/KN-*  
   switch(wParam) <Z%iP{  
   { Afm GA9  
    case VK_MENU: / sI0{  
     MaskBits|=ALTBIT; dIiQ^M  
     break; J [}8&sn  
    case VK_CONTROL: MNURYA=  
     MaskBits|=CTRLBIT; k,o|"9H  
     break; jEr/*kv  
    case VK_SHIFT: e%#(:L  
     MaskBits|=SHIFTBIT; 6x%uWZa'  
     break; u4QPO:,a4  
    default: //judge the key and send message 0Lcd@3XL  
     break; vJ9 6qX  
   } |0 #J=am  
   for(int index=0;index<MAX_KEY;index++){ kfaRN ^  
    if(hCallWnd[index]==NULL) o~7~S  
     continue; (=:9pbP  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ax{+7  k  
    { 2\h]*x% :  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ~nk{\ rWO  
     bProcessed=TRUE; .>z)6S_G  
    } )-$Od2u2c  
   } 9-)D"ZhLe  
  } [4uTp[U!r  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 <4,hrx&.  
   for(int index=0;index<MAX_KEY;index++){ ,4$ZB(\  
    if(hCallWnd[index]==NULL)  9?c0cwP?  
     continue; r )8[LN-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) `I+G7K K  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); vt0XCUnK  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 {KJ!rT  
   } 6 R}]RuFQ  
  } W]Z;=-CBr  
 } HO,z[6  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); rUjK1A{V  
} SaK aN#C  
QixEMX4<  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: _@I<H\^  
F9rxm  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); +92/0  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); v%O KOrJ  
4DY\QvW5  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: sE87}Lz  
hKP7p   
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ,!U._ic'B  
{ pyA;%vJn  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 4%L`~J4 wr  
 { : vN'eL|#  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 o*OYZ/_L  
  SaveBmp(); b#;%TbDF  
  return FALSE; ` #Qlr+X  
 } !#0Lo->OO  
 …… //其它处理及默认处理 ^|yw)N]Q/  
} s=0z%~H  
TVVL1wZ  
9\9:)q  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 po@=$HK  
tU2 8l.  
  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。 /wplP+w2  
'TWZ@8h~  
  二、编程步骤 xa+=9=<AQ  
5U)Ia>p  
  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"; wZv"tbAWLV  
'0QrM,B9  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; dg[ &5D1Q  
Q)eYJP=W  
  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; 6Y4sv5G  
$10"lM[  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; /VFh3n>I2  
S?pWxHR]  
  5、 添加代码,编译运行程序。 olc7&R  
&'{6_-kh  
三、程序代码 =6FA(R|QU  
'Fi\Qk'D@  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL jWHv9XtW  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) C3EQz r`  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ #- S%aeB  
#if _MSC_VER > 1000 ph*?y  
#pragma once w|$i<OIi)  
#endif // _MSC_VER > 1000 fFu+P<?"  
#ifndef __AFXWIN_H__ R42+^'af  
#error include 'stdafx.h' before including this file for PCH *?sdWRbu}l  
#endif ;a@%FWc  
#include "resource.h" // main symbols d/I,`  
class CHookApp : public CWinApp iTTUyftHT  
{ lu~<pfg  
 public: , y%!s27  
  CHookApp(); W&E?#=*X  
  // Overrides t>nx#ErS  
  // ClassWizard generated virtual function overrides 9 <qAf`  
  //{{AFX_VIRTUAL(CHookApp) -'SpSy'_  
 public: OV<'v%_&  
  virtual BOOL InitInstance(); Q<4Sd:P`"  
  virtual int ExitInstance(); fuRCM^U(  
  //}}AFX_VIRTUAL IM-O<T6r[N  
  //{{AFX_MSG(CHookApp) ;2Aqztp  
  // NOTE - the ClassWizard will add and remove member functions here. # .1+-^TQk  
  // DO NOT EDIT what you see in these blocks of generated code ! {8b6M  
  //}}AFX_MSG (jj=CLe  
  DECLARE_MESSAGE_MAP() sfb)iH|sW  
}; u-v/`F2wN  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); L1P.@hJ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); n*twuB/P 1  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); #0OW0:Q  
BOOL InitHotkey(); XMt)\r.  
BOOL UnInit(); 5d ?\>dA  
#endif N]yh8"7X  
44e:K5;]7  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. &y\7pAT\  
#include "stdafx.h" dM n0nc+  
#include "hook.h" 9j'(T:Zs  
#include <windowsx.h> !vd(WKq  
#ifdef _DEBUG b+b].,  
#define new DEBUG_NEW -M\ae  
#undef THIS_FILE pBo=omQV  
static char THIS_FILE[] = __FILE__; Y.>F fL  
#endif F3)w('h9c  
#define MAX_KEY 100 gJ \CT'/  
#define CTRLBIT 0x04 ngmHiI W  
#define ALTBIT 0x02 ,3+#?H  
#define SHIFTBIT 0x01 UNK}!>HD  
#pragma data_seg("shareddata")  .7GTL  
HHOOK hHook =NULL; .J?cV;:`  
UINT nHookCount =0; o03Y w)*  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey P_(QG 6  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT },r9f MJ  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey pi?$h"y7Q  
static int KeyCount =0; CEQs}bz  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift EA# {N<  
#pragma data_seg() ^l;N;5L  
HINSTANCE hins; yLpsK[)}\  
void VerifyWindow(); sVT:1 kI  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) qYba%g9RN(  
//{{AFX_MSG_MAP(CHookApp) &YiUhK  
// NOTE - the ClassWizard will add and remove mapping macros here. SM? rss.=  
// DO NOT EDIT what you see in these blocks of generated code! c&> S  
//}}AFX_MSG_MAP l$1 ]  
END_MESSAGE_MAP() 5/w4[d  
(:|g"8mQm  
CHookApp::CHookApp() QOT|6)Yb  
{ &/+LY_r'<I  
 // TODO: add construction code here, V -X*e  
 // Place all significant initialization in InitInstance \mp2LICQg  
} BIQQJLu  
7+'&(^c  
CHookApp theApp; zCz"[9k  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) HpCTQ\H  
{ 2!kb?  
 BOOL bProcessed=FALSE; h^ o@=%b  
 if(HC_ACTION==nCode) h#:_GNuF  
 { L!| `IK  
  if((lParam&0xc0000000)==0xc0000000){// Key up Ef)v("'w  
   switch(wParam) zWO!z =  
   { S {d]0  
    case VK_MENU: NCX`-SLv  
     MaskBits&=~ALTBIT; ro}WBv  
     break; Y|X!da/  
    case VK_CONTROL: ;Q.'u  
     MaskBits&=~CTRLBIT; Xtk3~@  
     break; h/s8".\  
    case VK_SHIFT: .]XBJc  
     MaskBits&=~SHIFTBIT; b)(si/]\  
     break; U;w| =vM  
    default: //judge the key and send message (fqU73  
     break; xwhS[d  
   } dy"7Wl]hi7  
   for(int index=0;index<MAX_KEY;index++){ 9EFQo^ E  
    if(hCallWnd[index]==NULL) o;[cApiQ,2  
     continue; qu`F,OG  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) e'dx Y(  
    { ]H-5    
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); P*!~Z *"  
     bProcessed=TRUE; 9O4\DRe5c  
    } |s!<vvp]  
   } 16-1&WuY@  
  } Z,_EhEm  
  else if((lParam&0xc000ffff)==1){ //Key down Y 8Dn&W  
   switch(wParam) 7W.z8>p  
   { ]^>RBegJBO  
    case VK_MENU: \Dx5=Lh  
     MaskBits|=ALTBIT; E51'TT9  
     break; ;659E_y>  
    case VK_CONTROL: y F;KyY{  
     MaskBits|=CTRLBIT; =WEWs4V5A  
     break; TQL_K8k@_  
    case VK_SHIFT: =38c}(  
     MaskBits|=SHIFTBIT; p!/ *(TT  
     break; a/Ik^:>m  
    default: //judge the key and send message Nm{J=`  
     break; =a $7^d  
   } ecdM+kP  
   for(int index=0;index<MAX_KEY;index++) iezY+`x4  
   { ?m bI6fYv  
    if(hCallWnd[index]==NULL) *r/o \pyH  
     continue; jBr3Ay@<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) .22}= z  
    { :G4)edwe  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); "ivSpec.V  
     bProcessed=TRUE; ]N^>>k  
    } dTVh{~/  
   } R^VmNj  
  } tSX,*cz  
  if(!bProcessed){ Z}`A'#!  
   for(int index=0;index<MAX_KEY;index++){ z{ (c-7*  
    if(hCallWnd[index]==NULL) M?v`C>j  
     continue; fO{'$?K  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) s*tzU.E (  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); OrRU$5Lo  
   } -Gj."ks  
  } $h|8z  
 } v$~ZT_"(9  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); )U +Pt98"  
} 1Q!^%{Y;  
2>F `H7W  
BOOL InitHotkey() \= G8  
{ # XeEpdE  
 if(hHook!=NULL){ 1$v1:6  
  nHookCount++; 7hAc6M$h;  
  return TRUE; 1#V&'A  
 } oV;I8;#\J  
 else f-5}`)`.+  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); yv(\5)XF  
  if(hHook!=NULL) '/GZ/$a_l  
   nHookCount++; GmdS~Fhp  
  return (hHook!=NULL); ia*Bcx_RW+  
} tD+K4 ^  
BOOL UnInit() =SK{|fBB  
{ 28,g'k!  
 if(nHookCount>1){ ' p!\[* e  
  nHookCount--; W@WKdaJ  
  return TRUE; Ey]P >J  
 } i{MzQE+_^  
 BOOL unhooked = UnhookWindowsHookEx(hHook); pIgjo>K  
 if(unhooked==TRUE){ ` 7jdV  
  nHookCount=0; \w=*:Z  
  hHook=NULL; qM9> x:V  
 } +8 }p-<a  
 return unhooked; (;2]`D [x  
} ;|D8"D6]  
;T|hNsSt  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) s}Q*zy  
{ 2 X`5YN;  
 BOOL bAdded=FALSE; TIVrbO\!o  
 for(int index=0;index<MAX_KEY;index++){ nA.~}  
  if(hCallWnd[index]==0){ q/dja  
   hCallWnd[index]=hWnd; m<GJ1)%3i  
   HotKey[index]=cKey; ~IS3i'bh  
   HotKeyMask[index]=cMask; K)nn;j=  
   bAdded=TRUE; ^cI 0 d,3=  
   KeyCount++; Y/`*t(/5  
   break; 8]A`WDO3  
  } 9~6~[z  
 } i3<ZFR  
 return bAdded; m:C|R-IL  
} vx4Jk]h+=L  
GU]_Z!3  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !A#(bC  
{ jB0ED0)wX  
 BOOL bRemoved=FALSE; t4FaU7  
 for(int index=0;index<MAX_KEY;index++){ 5tcJT z  
  if(hCallWnd[index]==hWnd){ &)F# cVB  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ .WpvDDUK3  
    hCallWnd[index]=NULL; 11BfJvs:  
    HotKey[index]=0; o WcBQ|   
    HotKeyMask[index]=0; ;0Mg\~T~'  
    bRemoved=TRUE; \"=b8x  
    KeyCount--; k-|b{QZ8!;  
    break; O_|p{65  
   } PJ'.s  
  } 8BggK6X  
 } ?vocI  
 return bRemoved; )jm u*D5N  
} 9p%8VDF=  
{"@E_{\  
void VerifyWindow() +^V%D!.$@  
{ nI<Ab_EB  
 for(int i=0;i<MAX_KEY;i++){ |emZZj  
  if(hCallWnd!=NULL){ ]?n~?dD{]  
   if(!IsWindow(hCallWnd)){ j[&C6l+wH  
    hCallWnd=NULL; =7 ${bp!  
    HotKey=0; p'YNj3&u  
    HotKeyMask=0; z]0UW\S/  
    KeyCount--; F'3-*>]P  
   } ca?;!~%zA  
  } x[1( cj  
 } BZs?tbf  
} \"AzT{l!;  
zR6^rq*  
BOOL CHookApp::InitInstance() ` EgO&;1D)  
{ kz?m `~1  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); FX:'38-fk  
 hins=AfxGetInstanceHandle(); X.hV MX2B  
 InitHotkey(); YMIX|bj6Y  
 return CWinApp::InitInstance(); mFeoeI,Jv  
} U(u$5  
V0a)9\x(\  
int CHookApp::ExitInstance() *pKj6x  
{ d ~3G EK  
 VerifyWindow(); N Uq'96 {Y  
 UnInit(); XdGA8%^cY  
 return CWinApp::ExitInstance(); DgRA\[c  
} G8Sx;Xi  
k5TPzm=y{  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file X7{ h/^  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) X)k+BJ  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ zx=AT  
#if _MSC_VER > 1000 M`gr*p  
#pragma once ]q|^?C  
#endif // _MSC_VER > 1000 Fc.1)yh.  
:}}~ $$&  
class CCaptureDlg : public CDialog ~@N0$S  
{ Rln JlY/  
 // Construction .qG*$W2f  
 public: )1 =|\  
  BOOL bTray; # vBS7ba  
  BOOL bRegistered; .m \y6  
  BOOL RegisterHotkey(); 3FpSo+  
  UCHAR cKey; q+}Er*r  
  UCHAR cMask; BHEZ<K[U   
  void DeleteIcon(); o7WK"E!pF'  
  void AddIcon(); k=r)kkO)  
  UINT nCount; eK'ztqQ  
  void SaveBmp(); m-)yQM8  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor *w_f-YoXp  
  // Dialog Data Oa#m}b  
  //{{AFX_DATA(CCaptureDlg) Q2 @Ugt$  
  enum { IDD = IDD_CAPTURE_DIALOG }; Nw|m"VLb  
  CComboBox m_Key; 4> $weu^  
  BOOL m_bControl; M}*#{UV2  
  BOOL m_bAlt; SM@RELA'Lb  
  BOOL m_bShift; L !V6 Rfy  
  CString m_Path; `1qM Sq  
  CString m_Number; -|&5aH]  
  //}}AFX_DATA M~#% [?iU  
  // ClassWizard generated virtual function overrides 7n*[r*$  
  //{{AFX_VIRTUAL(CCaptureDlg) of>"qrdZ  
 public: RmcQGQ  
  virtual BOOL PreTranslateMessage(MSG* pMsg); K^fH:pV  
 protected: L fx$M  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support SFRQpQ06  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); pu9ub.  
  //}}AFX_VIRTUAL o6~9.~_e  
  // Implementation gBCO>nJws  
 protected: ~76qFZe-  
  HICON m_hIcon; *g;4?_f  
  // Generated message map functions 0'O*Y ]h+  
  //{{AFX_MSG(CCaptureDlg) .P>-Fh,_p  
  virtual BOOL OnInitDialog(); 1xF<c<  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Z$&i"1{  
  afx_msg void OnPaint(); dJYQdo^X  
  afx_msg HCURSOR OnQueryDragIcon(); Bm&%N?9  
  virtual void OnCancel(); \"^.>+  
  afx_msg void OnAbout(); {^qp~0  
  afx_msg void OnBrowse(); ?Pw(  
  afx_msg void OnChange(); -yH8bm'0"  
 //}}AFX_MSG FELTmQUV  
 DECLARE_MESSAGE_MAP() I:9jn"  
}; Lm}J& ^>  
#endif U)g2 7*7  
0zvA>4cq)  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file gNoQ[xFx32  
#include "stdafx.h" pHkhs{/X  
#include "Capture.h" 39zwPoN>  
#include "CaptureDlg.h" Hjtn*^fo^  
#include <windowsx.h> ,F)9{ <r]  
#pragma comment(lib,"hook.lib") t)hAD_sf  
#ifdef _DEBUG :Kt'Fm,s?  
#define new DEBUG_NEW hB:}0@l6p=  
#undef THIS_FILE 9V5d=^  
static char THIS_FILE[] = __FILE__; K)d]3V!  
#endif U`h>[9  
#define IDM_SHELL WM_USER+1 b08s610fk  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); x!@P|c1nKC  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Y']D_\y  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; = rLL5<  
class CAboutDlg : public CDialog 6rD Oa~<B  
{ WMw]W&  
 public: 4`Z8EV  
  CAboutDlg(); |-SImxV  
  // Dialog Data CYCG5)<9  
  //{{AFX_DATA(CAboutDlg) L[s8`0  
  enum { IDD = IDD_ABOUTBOX }; KnjowK  
  //}}AFX_DATA 4v("qNw#  
  // ClassWizard generated virtual function overrides }co*%F{1  
  //{{AFX_VIRTUAL(CAboutDlg) RN0=jo!58  
 protected: Z<,$Xv L  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support <#r/4a"V  
  //}}AFX_VIRTUAL MPg"n-g*  
  // Implementation ao(lj  
 protected: |{G GATni  
  //{{AFX_MSG(CAboutDlg) }F~4+4B^  
  //}}AFX_MSG mm,be.  
  DECLARE_MESSAGE_MAP() It .`  
}; ;[~:Y[N  
YLEa;MR  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) a7Fc"s*  
{ 6]*~!al?  
 //{{AFX_DATA_INIT(CAboutDlg) jg7 WMH"`  
 //}}AFX_DATA_INIT }&{z-/;H  
} I3wv6xZ2  
ub* j&L=  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) X\a*q]"_  
{ :Vyr8+]  
 CDialog::DoDataExchange(pDX); kA1C&  
 //{{AFX_DATA_MAP(CAboutDlg) D<35FD,  
 //}}AFX_DATA_MAP ^bj aa  
} '`K-rvF,C  
apxY2oE&  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) P}kp_l27  
 //{{AFX_MSG_MAP(CAboutDlg) |dxcEjcY_  
 // No message handlers A&:i$`m,  
 //}}AFX_MSG_MAP 7kZ-`V|\.  
END_MESSAGE_MAP() s^n}m#T  
]$VYzE2e  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) uuA q\YZy/  
: CDialog(CCaptureDlg::IDD, pParent) :172I1|7  
{ UJWkG^?  
 //{{AFX_DATA_INIT(CCaptureDlg) DG!H8^  
  m_bControl = FALSE; [z^db0PU  
  m_bAlt = FALSE; v,] &[`  
  m_bShift = FALSE; c-ahe;q  
  m_Path = _T("c:\\"); 3i c6!T#t"  
  m_Number = _T("0 picture captured."); EGKj1_ml  
  nCount=0; aj71oki)  
  bRegistered=FALSE; GWU"zWli]z  
  bTray=FALSE; W]t!I}yPR  
 //}}AFX_DATA_INIT W_ =  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 SX4"HadV>  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); xp4w9.X5(  
} yl=_ /'*  
UY!N"[&  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 5:o$]LkOWC  
{ d? Old  
 CDialog::DoDataExchange(pDX); q*^F"D:?k  
 //{{AFX_DATA_MAP(CCaptureDlg) 4%3R}-'mh  
  DDX_Control(pDX, IDC_KEY, m_Key); S-8wL%r  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 2K Um(B.I  
  DDX_Check(pDX, IDC_ALT, m_bAlt); RKY~[IQ,  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 9EE},D  
  DDX_Text(pDX, IDC_PATH, m_Path); P9\!JH!  
  DDX_Text(pDX, IDC_NUMBER, m_Number); .K n)sD1  
 //}}AFX_DATA_MAP `a!:-.:v  
} !p4y@U{  
p..O;_U  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) (|F} B  
//{{AFX_MSG_MAP(CCaptureDlg) c)HHc0KD  
 ON_WM_SYSCOMMAND() 9b/7~w.  
 ON_WM_PAINT() J*lKXFq7  
 ON_WM_QUERYDRAGICON() l|O)B #  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) |Mm9QF;iA  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) GomTec9.  
 ON_BN_CLICKED(ID_CHANGE, OnChange) (61_=,jv\h  
//}}AFX_MSG_MAP ^zMME*G  
END_MESSAGE_MAP() A@W/  
[CBhipoc  
BOOL CCaptureDlg::OnInitDialog() QBNnvg4v  
{ b~1]}9TJ  
 CDialog::OnInitDialog(); }nQni?  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); (L{Kg U&{$  
 ASSERT(IDM_ABOUTBOX < 0xF000); &7{/ x~S{  
 CMenu* pSysMenu = GetSystemMenu(FALSE); U8T"ABvFP  
 if (pSysMenu != NULL)  b* QRd  
 { /%#LA  
  CString strAboutMenu; [&Z3+/lR*  
  strAboutMenu.LoadString(IDS_ABOUTBOX); #DN5S#Ic  
  if (!strAboutMenu.IsEmpty()) {x+"Ru~7,  
  { ^+ hJ& 9W  
   pSysMenu->AppendMenu(MF_SEPARATOR); m5G9 B-\?  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); TJB) ]d<  
  } <HLe,  
 } *6-fvqCv  
 SetIcon(m_hIcon, TRUE); // Set big icon Zewx*Y|  
 SetIcon(m_hIcon, FALSE); // Set small icon g `)5g5  
 m_Key.SetCurSel(0); lE8M.ho\  
 RegisterHotkey(); 0{8^)apII  
 CMenu* pMenu=GetSystemMenu(FALSE); AF=9KWqf  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Xy74D/ocui  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); P~>E  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); j &#A 9!  
 return TRUE; // return TRUE unless you set the focus to a control )]=1W  
} 98%M`WY  
<h$Nh0  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 1;\A./FVv  
{ tj:Q]]\M  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) b)SU8z!NV&  
 { 8fn7!  
  CAboutDlg dlgAbout; PjH[8:,  
  dlgAbout.DoModal(); PFqc_!Pm  
 } f1a >C  
 else 3H_mR j9th  
 { y;!qE~!3  
  CDialog::OnSysCommand(nID, lParam); `Jvy~T  
 } bN ,>,hj  
} aAlES< r  
LIo3a38n?y  
void CCaptureDlg::OnPaint() hdw-gem{?  
{ (6aSDx Sc  
 if (IsIconic()) $#cZJ@;]  
 { 'THcO*<  
  CPaintDC dc(this); // device context for painting 92@/8,[  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); JYY:~2  
  // Center icon in client rectangle d$3;o&VUNI  
  int cxIcon = GetSystemMetrics(SM_CXICON); wIrjWU2  
  int cyIcon = GetSystemMetrics(SM_CYICON); .H M1c  
  CRect rect; Y: ~A-_  
  GetClientRect(&rect); l1_Tr2A}7/  
  int x = (rect.Width() - cxIcon + 1) / 2; UN~dzA~V  
  int y = (rect.Height() - cyIcon + 1) / 2; X>[x7t:  
  // Draw the icon hnQDm$k  
  dc.DrawIcon(x, y, m_hIcon); i/&?e+i  
 } >|)ia5#  
 else K/2k/\Jk[_  
 { d6$,iw@>^  
  CDialog::OnPaint(); 14[+PoF^A  
 } re\@v8w~  
} 7j>NUx=j3  
(1 "unP-  
HCURSOR CCaptureDlg::OnQueryDragIcon() B?Vr9H7n  
{ N=>6PLie  
 return (HCURSOR) m_hIcon; 6m.ChlO/  
} "[PxLq5  
Zu4|1 W  
void CCaptureDlg::OnCancel() L|y4u;-Q  
{ F{:ZHCm  
 if(bTray) 0XrB+nt  
  DeleteIcon(); m])!'Pa( =  
  CDialog::OnCancel(); CQf<En|1  
} 9`"o,wGX3  
I)xB I~x  
void CCaptureDlg::OnAbout() e}x}Fj</(  
{ r/X4Hy0!lT  
 CAboutDlg dlg; |ZEZ@y^  
 dlg.DoModal(); ")/TbT Vu  
} K[wOK  
|x2 +O  
void CCaptureDlg::OnBrowse() 1'skCR|!<  
{ )'<B\P/  
 CString str; ^2gDhoO_  
 BROWSEINFO bi; +`EF0sux  
 char name[MAX_PATH];  T4}SF  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); xW$F-n  
 bi.hwndOwner=GetSafeHwnd(); y$n7'W6  
 bi.pszDisplayName=name; [m9Pt]j@  
 bi.lpszTitle="Select folder"; ]L'FYOfrpx  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; U({20  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); H-?wEMi)*u  
 if(idl==NULL) y8Q96zi  
  return; 16iymiLz&  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); .k{omr&Dy5  
 str.ReleaseBuffer(); /jR]sC)xs  
 m_Path=str; i[:S *`@S  
 if(str.GetAt(str.GetLength()-1)!='\\') b-/ztZ@u  
  m_Path+="\\"; A)5-w`1  
 UpdateData(FALSE); 3Y\7+975m  
} hjuzVOE|W  
_%HpB=  
void CCaptureDlg::SaveBmp() 81\$X  
{ J{GtH[  
 CDC dc; L{v^:  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); x.V6C0|6"  
 CBitmap bm; Cd4a7<-  
 int Width=GetSystemMetrics(SM_CXSCREEN); 4Xna}7  
 int Height=GetSystemMetrics(SM_CYSCREEN); rsbd DTy  
 bm.CreateCompatibleBitmap(&dc,Width,Height); i|'M'^3r  
 CDC tdc; :<-,[(@bR  
 tdc.CreateCompatibleDC(&dc); CYr2~0<g  
 CBitmap*pOld=tdc.SelectObject(&bm); G1; .\i  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); S(7_\8 h  
 tdc.SelectObject(pOld); b&LfL$  
 BITMAP btm; G2FP|mf,  
 bm.GetBitmap(&btm); U Ox$Xwp5&  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; oDyrf"dl  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 0nkon3H  
 BITMAPINFOHEADER bih; -rU~  
 bih.biBitCount=btm.bmBitsPixel; 2gn*B$a  
 bih.biClrImportant=0; n-h2SQl!  
 bih.biClrUsed=0; Nhh2P4gH  
 bih.biCompression=0; 5:jbd:o  
 bih.biHeight=btm.bmHeight; P);: t~  
 bih.biPlanes=1; 5rAI[r 9  
 bih.biSize=sizeof(BITMAPINFOHEADER); /Q7cQ2[EU  
 bih.biSizeImage=size; :!omog  
 bih.biWidth=btm.bmWidth; ,/.U'{  
 bih.biXPelsPerMeter=0; jTNfGu0x  
 bih.biYPelsPerMeter=0; F&{RP>  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); S ("Zzq`  
 static int filecount=0; Vb|;@*=R&Q  
 CString name; ~Rzn =>a  
 name.Format("pict%04d.bmp",filecount++); *>Z|!{bI  
 name=m_Path+name; :n3)vK   
 BITMAPFILEHEADER bfh; 8S&Kf>D  
 bfh.bfReserved1=bfh.bfReserved2=0; q!iMc  
 bfh.bfType=((WORD)('M'<< 8)|'B'); L  lP  
 bfh.bfSize=54+size; Qm| Q0u   
 bfh.bfOffBits=54; '4PAH2&n  
 CFile bf; ,&S ^Ryc  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ U @Il:\I  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ;4jRsirx9  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); #1MEmt  
  bf.WriteHuge(lpData,size); ,2F4S5F~rC  
  bf.Close(); 8^fkY'x  
  nCount++; \`w!v,aM$  
 } c#q OK  
 GlobalFreePtr(lpData); B;M{v5s~]  
 if(nCount==1) 39;Z+s";  
  m_Number.Format("%d picture captured.",nCount); =*q|568  
 else lVywc:X  
  m_Number.Format("%d pictures captured.",nCount); R jO9E.nm  
  UpdateData(FALSE); I0 y+,~\  
} =<-tD<  
55vpnRM  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) '1)BZ!  
{ aqvt$u8  
 if(pMsg -> message == WM_KEYDOWN) >3H/~ Y  
 { myT z  
  if(pMsg -> wParam == VK_ESCAPE) NI eKS_ +  
   return TRUE; Lc>9[! +#  
  if(pMsg -> wParam == VK_RETURN) ;!<WL@C~  
   return TRUE; Wt +, 6Cq  
 } aq[;[$w  
 return CDialog::PreTranslateMessage(pMsg); m178S3  
} S7-ka{S  
Jji~MiMn  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) dhe?7r ]u  
{ 9wP_dJvb  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ $!c)%qDq  
  SaveBmp(); C24[brf  
  return FALSE; gY AXUM,  
} .p%p_  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ .. qAE.%%  
 CMenu pop; } d / 5_X  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); R9SJ;TsE  
 CMenu*pMenu=pop.GetSubMenu(0); '3Ir(]Wfd  
 pMenu->SetDefaultItem(ID_EXITICON); q# W|*kL3  
 CPoint pt; <uP>  
 GetCursorPos(&pt); 8y}9X v  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); DXlP (={*  
 if(id==ID_EXITICON) E3gR%t  
  DeleteIcon(); e";r_J3w  
 else if(id==ID_EXIT) `BKo`@  
  OnCancel(); [GeJn\C_?  
 return FALSE; T>(nc"(  
} .I{b]6  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ?45kN=%*s  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ScrEtN  
 AddIcon(); ! /Z{uy  
 return res; = GirUW D  
} **rA/*Oc  
 `"v5bk  
void CCaptureDlg::AddIcon() .BGM1ph}~  
{ "|CzQ&e  
 NOTIFYICONDATA data; qkC+9Sk  
 data.cbSize=sizeof(NOTIFYICONDATA); mrDIt4$D  
 CString tip; P&3'N~k-  
 tip.LoadString(IDS_ICONTIP); 96aA2s1  
 data.hIcon=GetIcon(0); ~U&,hFSPY  
 data.hWnd=GetSafeHwnd(); &6A'}9Ch  
 strcpy(data.szTip,tip); yH>`Kbf T  
 data.uCallbackMessage=IDM_SHELL; i<|5~tm  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; @psyO]D=j%  
 data.uID=98; [B9'/:  
 Shell_NotifyIcon(NIM_ADD,&data); NLFSw  
 ShowWindow(SW_HIDE); 0bxB@(NO  
 bTray=TRUE; #Ag-?k  
} ko2Kz k  
Ghgx8 ]e  
void CCaptureDlg::DeleteIcon() I]P'wav~O  
{ J=4R" _yo  
 NOTIFYICONDATA data; u-Pa:wm0-  
 data.cbSize=sizeof(NOTIFYICONDATA); o.t$hv|  
 data.hWnd=GetSafeHwnd(); O"4Q=~Y  
 data.uID=98; qG7^XO Ws-  
 Shell_NotifyIcon(NIM_DELETE,&data); A87JPX#R?  
 ShowWindow(SW_SHOW); ryzz!0l  
 SetForegroundWindow(); c0]^V>}cl  
 ShowWindow(SW_SHOWNORMAL); 7N"$~UfC  
 bTray=FALSE; ; >3q@9\D  
} i(9=` A}  
e&f9/rfx  
void CCaptureDlg::OnChange() gB@Xi*  
{ 2"lDKjj  
 RegisterHotkey(); 43pQFDWa  
} <=8REA?  
6k;__@B,  
BOOL CCaptureDlg::RegisterHotkey() *vFVXJo  
{ 7QP%Pny%  
 UpdateData(); x[7jm"Pz  
 UCHAR mask=0; 8DbXv~3@  
 UCHAR key=0; edhNQWn  
 if(m_bControl) `e]L.P_e?  
  mask|=4; *,hS-  
 if(m_bAlt)  t4pc2b  
  mask|=2; Dt)\q^bH)  
 if(m_bShift) {dJC3/ Rf  
  mask|=1; !b0'd'xe  
  key=Key_Table[m_Key.GetCurSel()]; 7''l\3mIn  
 if(bRegistered){ kH1hsDe|&y  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 3o%,8l,  
  bRegistered=FALSE; YQOdwc LG  
 } J@Eqqyf"  
 cMask=mask; 98h,VuKVaB  
 cKey=key; />;1 }  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); jq#_*&Eg]  
 return bRegistered; V| b9zHh  
} B" TZ8(<  
Z8nj9X$   
  四、小结 \]}|m<R  
1a 3rA  
  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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