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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: ^pJ0nY# c  
  .=Pm>o/,  
  一、实现方法 $!a?i@  
>W8bWQ^fK  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: {V[Ha~b%*  
;US83%*  
#pragma data_seg("shareddata") dKU5;  
HHOOK hHook =NULL; //钩子句柄 cICHRp&&  
UINT nHookCount =0; //挂接的程序数目 z8b _ _%Br  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 +``>,O6  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 d2ohW|  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey &c20x+  
static int KeyCount =0;  "\`>2  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 "VV914*z  
#pragma data_seg() j,}4TDWa  
c2/FHI0J;  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 3nwz<P  
!loO%3_)  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: ]a)IMIh;  
= Q@6c   
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR PM@XtL7J  
cKey,UCHAR cMask) j\! e9M  
{ f](I.lm:  
 BOOL bAdded=FALSE; ?4:rP@  
 for(int index=0;index<MAX_KEY;index++){ aJI>FTdK  
  if(hCallWnd[index]==0){ w-lrnjs  
   hCallWnd[index]=hWnd; ^Ss<X}es-  
   HotKey[index]=cKey; !@( M_Z'  
   HotKeyMask[index]=cMask; 2.]~*7   
   bAdded=TRUE; P!5Z]+B#  
   KeyCount++; AQ-mE9>P  
   break; P2>:p%Z  
  } zgK;4 22$m  
 } 8AryIgy>@  
 return bAdded; D^n xtuT*  
} >Z}@7$(7!~  
//删除热键 ja?s@Y}-9s  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) VW{,:Ya  
{ }bp.OV-+  
 BOOL bRemoved=FALSE; EVG"._I@  
 for(int index=0;index<MAX_KEY;index++){ ` %uK0qw"  
  if(hCallWnd[index]==hWnd){ l7ZB3'  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ (JWv *p  
    hCallWnd[index]=NULL; @2u#93Y  
    HotKey[index]=0; D{>\-]\  
    HotKeyMask[index]=0; N50fL  
    bRemoved=TRUE; E$w#+.QP  
    KeyCount--; 6Hda]y  
    break; #aa1<-&H  
   } rxs8De  
  } A$Wx#r7)  
 } 0E yAMu  
 return bRemoved; pOKeEW<q  
} =9(tsB gTX  
X\kjAMuW/*  
)PwQ^||{  
  DLL中的钩子函数如下: +uELTHH=  
w3d34*0$  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ^eobp.U  
{ |Hfl&3  
 BOOL bProcessed=FALSE; C *a,<`  
 if(HC_ACTION==nCode) `T=1<Twc  
 { $}db /hY*  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 n_J5zQJ  
   switch(wParam) Jns/v6  
   {  <z',]hy  
    case VK_MENU: +ZX .1[O  
     MaskBits&=~ALTBIT; Y3<b~!f  
     break; I :@|^PYw  
    case VK_CONTROL: `&H04x"Y$>  
     MaskBits&=~CTRLBIT; @O'I)(To  
     break; q4+Yv2e <r  
    case VK_SHIFT: w?_`/oqd|  
     MaskBits&=~SHIFTBIT; J)#S-ZB+'k  
     break; ac|/Y$\w  
    default: //judge the key and send message A0OB$OK  
     break; )L >Q;'  
   } e9lOk)`t  
   for(int index=0;index<MAX_KEY;index++){ hD*(AJ  
    if(hCallWnd[index]==NULL) &5d\~{;  
     continue; { a. <`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) {gw [%[ZM  
    { pD[pTMG@$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); bH,M,xIL2  
     bProcessed=TRUE; -8/JP  
    } 3 &Sp@,  
   } k1 RV'  
  } /eb-'m  
  else if((lParam&0xc000ffff)==1){ //有键按下 ZB$NVY  
   switch(wParam) pu#[pa  
   { p.5e: i^LJ  
    case VK_MENU: nn'Af,ko/  
     MaskBits|=ALTBIT; ~{$L9;x  
     break; I qx84  
    case VK_CONTROL: L/%Y#  
     MaskBits|=CTRLBIT; |*ReqM|_C  
     break; 3[.3dy7,Z  
    case VK_SHIFT: >C*4_J7  
     MaskBits|=SHIFTBIT; nSHNis  
     break; lA]N04 d  
    default: //judge the key and send message _CL{IY  
     break; m d_g}N(C  
   } }1Z6e[K?  
   for(int index=0;index<MAX_KEY;index++){ EWO /u.z  
    if(hCallWnd[index]==NULL) @%:E  }  
     continue; h"r!q[MN o  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @<a|  
    { M|H 2kvl  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);  pr/'J!{^  
     bProcessed=TRUE; K'V 2FTJI  
    } cl_T F[n?  
   } a MsJO*;>  
  } 3Soy3Xp  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 NNmM#eB:4  
   for(int index=0;index<MAX_KEY;index++){ 'gCZ'edM  
    if(hCallWnd[index]==NULL) ~5T$8^K  
     continue; ']h IfOD"r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) %i595Ij-]  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); a5 bPEJ=I  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 +!><5  
   } op.d;lO@  
  } ly=a>}F_  
 } w,/6B&|  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); mqw 84u  
} \C7q4p?8  
C bQ4Y  
  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: ) $J7sa  
W"t"X ~T3  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); iu|v9+  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 7 OWsHlU  
*E7R(#,yC  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: ,_bp)-OG  
xh r[ A  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) qX?[mdCHZ  
{ 7O$ &  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) >4c`UW  
 { 9DPb|+O-  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 %N1"* </q  
  SaveBmp(); djGs~H>;U_  
  return FALSE; ]'g:B p  
 } @k9Pz<ub  
 …… //其它处理及默认处理 7f r>ZY^  
} Sc{Tq\t;%  
(0}j]p'w  
XL~>rw<  
  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。 |T y=7d,  
G1[(F`t>  
  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。 p#=;)1  
EZ{\D!_Y  
  二、编程步骤 +q-c 8z  
/B[}I}X  
  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"; U!Mf]3  
`S$sQ&  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; U6c@Et,  
. pP7"E4]  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; ^vaL8+  
5k~\or 5_  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; g}Mi9Kp  
!5~k:1=  
  5、 添加代码,编译运行程序。 O2lIlCL  
}lO }x  
三、程序代码 4 4`WYK l  
ayeCi8  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL &F`L}#oL&  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) y!5:dvt  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ LihdZ )  
#if _MSC_VER > 1000 TzY *;  
#pragma once `;/XK,m-  
#endif // _MSC_VER > 1000 uY]T:UVk  
#ifndef __AFXWIN_H__ R"{l[9j4>  
#error include 'stdafx.h' before including this file for PCH `I#`:hj  
#endif 7_%2xewV|  
#include "resource.h" // main symbols LD_M 3 P  
class CHookApp : public CWinApp /ao<A\KR  
{ 7 Kjj?~RA  
 public: %"+4 D,'l  
  CHookApp(); yzg9I  
  // Overrides /GN4I!LA  
  // ClassWizard generated virtual function overrides +o u Y  
  //{{AFX_VIRTUAL(CHookApp) ~#4~_d.=L  
 public: Gk 6fO  
  virtual BOOL InitInstance(); Y;g% e3nu  
  virtual int ExitInstance(); v#F-<?Vv  
  //}}AFX_VIRTUAL 3a^)u-9,x  
  //{{AFX_MSG(CHookApp) mw"}8y  
  // NOTE - the ClassWizard will add and remove member functions here. +4HlRGH  
  // DO NOT EDIT what you see in these blocks of generated code ! 5us^B8Q  
  //}}AFX_MSG dQK`sLChv  
  DECLARE_MESSAGE_MAP() O{u[+g  
}; !t% Q{`p  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); qK,V$l(4#  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1!1DuQ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); wHWma)}-z  
BOOL InitHotkey(); tUv3jq)n%  
BOOL UnInit(); 2qXo{C3  
#endif k}s+ca!B  
gsfhH0  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. `@MPkC y1  
#include "stdafx.h" T5q-" W6\  
#include "hook.h" r,"7%1I  
#include <windowsx.h> :$2Yg[Zc3  
#ifdef _DEBUG #h{Nz/h+  
#define new DEBUG_NEW r@Nl 2  
#undef THIS_FILE _aY.  
static char THIS_FILE[] = __FILE__; P=Puaz5&{  
#endif Q.1XP  
#define MAX_KEY 100 E|{m"RUOy  
#define CTRLBIT 0x04 ^}@`!ON  
#define ALTBIT 0x02 U3+A MVnB  
#define SHIFTBIT 0x01 m3luhGn  
#pragma data_seg("shareddata") AA2ui%  
HHOOK hHook =NULL; y{92Lym  
UINT nHookCount =0; ,jTPg/r  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey }_]As}E  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT *l {4lu  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey L^)qe^%3  
static int KeyCount =0;  C/  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift zhjJ>d%w  
#pragma data_seg() zWtj|%ts  
HINSTANCE hins; 9cz)f\  
void VerifyWindow(); .aJ%am/:%  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 7j T#BWt  
//{{AFX_MSG_MAP(CHookApp) =E1tgrW  
// NOTE - the ClassWizard will add and remove mapping macros here. {KsVK4\r  
// DO NOT EDIT what you see in these blocks of generated code! QY6O(=  
//}}AFX_MSG_MAP Az9J\V~"  
END_MESSAGE_MAP() 8F)=n \  
NA\x<  
CHookApp::CHookApp() L&QtHSzy  
{ Q K j1yG0i  
 // TODO: add construction code here, $bFgsy*N2  
 // Place all significant initialization in InitInstance { Hr>X  
} U&X.  
) G|"jFP  
CHookApp theApp; U1jSUkqb  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) I:HV6_/^-G  
{ ]1tN|ODY*W  
 BOOL bProcessed=FALSE; PF`:1;P U  
 if(HC_ACTION==nCode) m|mG;8}pI  
 { A(NEWO  
  if((lParam&0xc0000000)==0xc0000000){// Key up wa2~C [  
   switch(wParam) 9\:w8M X'  
   { DP0Z*8Ia  
    case VK_MENU: GBW 7Y  
     MaskBits&=~ALTBIT; 9>IsqYc  
     break; Xj(>.E{~H  
    case VK_CONTROL: qhnapZJ  
     MaskBits&=~CTRLBIT; "raj>2@  
     break; v=>3"!*  
    case VK_SHIFT: y+= \z*9  
     MaskBits&=~SHIFTBIT; ZRO.bMgZF  
     break; -CwWs~!  
    default: //judge the key and send message h~:H?pj3g  
     break; [&Lxz~W][  
   } 9T/<x-FD  
   for(int index=0;index<MAX_KEY;index++){ sI$:V7/!  
    if(hCallWnd[index]==NULL) bje' Oolc  
     continue; %![4d;Z%x  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \wTW?>o Z  
    { IQ#So]9~Y  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); [XxA.S)x3  
     bProcessed=TRUE; *50ZinfoG  
    } q4 $sc_0i  
   } NXi ,5  
  } . rRc  
  else if((lParam&0xc000ffff)==1){ //Key down H&9wSG`  
   switch(wParam) h%u? lW  
   { Sw[=S '(l  
    case VK_MENU: P^ by'b+zI  
     MaskBits|=ALTBIT; J09ZK8 hK  
     break; *x5o=)Y  
    case VK_CONTROL: ,znL,%s  
     MaskBits|=CTRLBIT; gl Li  
     break; Z"+(LO!  
    case VK_SHIFT: RBPYG u'6B  
     MaskBits|=SHIFTBIT;  eMztjN  
     break; /1U,+g^O>  
    default: //judge the key and send message aQC 7V!v  
     break; Qve`k<Cj"  
   } K:C+/O  
   for(int index=0;index<MAX_KEY;index++) b\H/-7<  
   { Kgps_tY%  
    if(hCallWnd[index]==NULL) Gtf1}UJC  
     continue; 2 e )  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) - f+CyhR"*  
    { k#BU7Exij  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); (]o FB$  
     bProcessed=TRUE; 3$;J0{&[i  
    } N c9<X  
   } Ogn,1nm%  
  } 9  4 "f  
  if(!bProcessed){ /]P%b K6B  
   for(int index=0;index<MAX_KEY;index++){ zC[i <'h!T  
    if(hCallWnd[index]==NULL) Idt@Hk5<&  
     continue; @b4b{d5[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) P"U>tsHK:  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ;H`=):U  
   } Ti /;|lP@  
  } Gt?!E6^ !  
 } f45x%tha%  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); HdDo&#  
} !N@Yh"c  
w}fqs/)w  
BOOL InitHotkey() "~B~{ _<j  
{ ^Jc$BMaVg  
 if(hHook!=NULL){ :+kg4v&r  
  nHookCount++; H rM)jC<~  
  return TRUE; AN50P!FZW  
 } \nn56o@eN  
 else iLc)"L-i  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ~]jx+6k]  
  if(hHook!=NULL) N.ItyV  
   nHookCount++; i+kFL$N  
  return (hHook!=NULL); "0p +SZ~D  
} HE8'N=0  
BOOL UnInit() 1v+JCOy  
{ qQ3 ]E][/  
 if(nHookCount>1){ EY=\C$3J:  
  nHookCount--; y=y/d>=w  
  return TRUE; ,K"r:)\  
 } 6yV5Yjs  
 BOOL unhooked = UnhookWindowsHookEx(hHook); =P@M&Yy'  
 if(unhooked==TRUE){ ";%e~ =  
  nHookCount=0; :T8u?@ .  
  hHook=NULL; hlY S=cgY=  
 }  WMt&8W5  
 return unhooked; ~7FEY0/  
} ^' edE5  
/TR"\xQF  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) qJe&jLZa  
{ g^Ugl=f,  
 BOOL bAdded=FALSE; /S-/SF:>g  
 for(int index=0;index<MAX_KEY;index++){ [J[ysW})W  
  if(hCallWnd[index]==0){ 9u-M! $  
   hCallWnd[index]=hWnd; i!/h3%=  
   HotKey[index]=cKey; I_R5\l}O+D  
   HotKeyMask[index]=cMask; TZvBcNi   
   bAdded=TRUE; &z{dr ~  
   KeyCount++; *RUd!]bh  
   break; b6rzHnl{  
  } HXl r  
 } 7M&.UzIY`  
 return bAdded; a,F8+ Pb>  
} 8Iqk%n~(  
w>1l@%U o  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) +?J_6Mo@X  
{ ,4h! "c  
 BOOL bRemoved=FALSE; 8VBkIYgb  
 for(int index=0;index<MAX_KEY;index++){ v)v{QNQp^  
  if(hCallWnd[index]==hWnd){ }kgjLaQ^N  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ %BT)oH}  
    hCallWnd[index]=NULL; QBN=l\m+  
    HotKey[index]=0; ,_e/a   
    HotKeyMask[index]=0; @eAGN|C5  
    bRemoved=TRUE; Q}k_#w  
    KeyCount--; 7k[`]:*o  
    break; =]2RC1#}e  
   } MfZ}xu  
  } @5dB b+0J  
 } &D&5UdN x  
 return bRemoved; PG-cu$\??  
} VygXhh^7\  
c DEe?WS  
void VerifyWindow() ~I8"l@H>  
{ q^T&A[hMPx  
 for(int i=0;i<MAX_KEY;i++){ P"h,[{Y*>  
  if(hCallWnd!=NULL){ 3>:zo:;  
   if(!IsWindow(hCallWnd)){  5Fl  
    hCallWnd=NULL; H8=vQy  
    HotKey=0; S|=rF<]my  
    HotKeyMask=0; f(9$"Vi  
    KeyCount--; gzJ{Gau{)  
   } 7kWZMi  
  } ;{F;e)${M  
 } o#KPrW`XJ/  
} 8m1 3M5r  
l yLK$B?/  
BOOL CHookApp::InitInstance() @zq\z$  
{ $HR(|{piZ  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); (0+GLI8  
 hins=AfxGetInstanceHandle(); OA8b_k~  
 InitHotkey(); aS1P]&  
 return CWinApp::InitInstance(); EcS-tE 4%  
} <}x|@u  
/i]=ndAk  
int CHookApp::ExitInstance() ?-6x]l=]  
{ &&QDEDszp  
 VerifyWindow(); 5jCEy*%P@  
 UnInit(); *F4G qX3  
 return CWinApp::ExitInstance(); #\!hBL @b  
} *z  ;N  
3 v,ae7$U&  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ?U.&7yY  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ;H#R{uR_<  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ . AQ3zpy5B  
#if _MSC_VER > 1000 kI1{>vYD  
#pragma once vG Lb2Q  
#endif // _MSC_VER > 1000 #.t$A9'  
u3?Pp[tM<  
class CCaptureDlg : public CDialog Wn9Mr2r!*,  
{ !?>p]0*<  
 // Construction OmUw.VH  
 public: v.8S V]  
  BOOL bTray; ]\b1~ki!F  
  BOOL bRegistered; vEee/+1?  
  BOOL RegisterHotkey(); A"T. nqB^y  
  UCHAR cKey; #}]il0d  
  UCHAR cMask; 3E2.v5*  
  void DeleteIcon(); Tk@g9\6O9  
  void AddIcon(); :Tl6:=B  
  UINT nCount;  sCf(h  
  void SaveBmp(); :@4>}k*  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 2W-NCE%K)T  
  // Dialog Data ^}pREe c=  
  //{{AFX_DATA(CCaptureDlg) EpS8,[w  
  enum { IDD = IDD_CAPTURE_DIALOG }; t;~`Lm@hY  
  CComboBox m_Key; / )u,Oa  
  BOOL m_bControl; 0dX=  
  BOOL m_bAlt; -"^WDs  
  BOOL m_bShift; OQb9ijLeK  
  CString m_Path; O=?X%m #  
  CString m_Number; y.]]V"'2  
  //}}AFX_DATA (( IBaEq  
  // ClassWizard generated virtual function overrides RlPByG5K  
  //{{AFX_VIRTUAL(CCaptureDlg) c o%_~xO  
 public: L" ^366M!  
  virtual BOOL PreTranslateMessage(MSG* pMsg); V$F.`O!hfi  
 protected: U&\{/l  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support qA\kx#v]P  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); '!L1z45  
  //}}AFX_VIRTUAL ob5nk ^y  
  // Implementation I!0 +RP(  
 protected: GpQF * x  
  HICON m_hIcon; EYD{8Fw-  
  // Generated message map functions fvfVBk#  
  //{{AFX_MSG(CCaptureDlg) Z1lF[d,f;  
  virtual BOOL OnInitDialog(); U\GZ  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); V4i%|vV  
  afx_msg void OnPaint(); N S}`(N  
  afx_msg HCURSOR OnQueryDragIcon(); Ewsg&CCN  
  virtual void OnCancel(); I\6<)2j/L  
  afx_msg void OnAbout(); DT]p14@t9  
  afx_msg void OnBrowse(); :mHtK)z~  
  afx_msg void OnChange(); S7>gNE;%]u  
 //}}AFX_MSG [k{iN1n  
 DECLARE_MESSAGE_MAP() Q>c6ouuJ  
}; Y_YIJ@  
#endif <%JO 3E  
cQ ;Ry!$  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 8t \>  
#include "stdafx.h" A|OC?NZY  
#include "Capture.h" BiCa "  
#include "CaptureDlg.h" 9F1stT0G%  
#include <windowsx.h> q _|5,_a  
#pragma comment(lib,"hook.lib") ?v~3zHK  
#ifdef _DEBUG *pUV-^uo  
#define new DEBUG_NEW (SVr>|Db  
#undef THIS_FILE O}!@28|3"  
static char THIS_FILE[] = __FILE__; (>`SS#(T!  
#endif x`l; ;  
#define IDM_SHELL WM_USER+1 5&Kn #  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ]lYEJ`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); %Z0S"B 3  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; O!Cu.9}  
class CAboutDlg : public CDialog ]7 mSM  
{ ~,-O  
 public: ^#nWgo7{7  
  CAboutDlg(); )#Bfd(F  
  // Dialog Data }@6 %yR  
  //{{AFX_DATA(CAboutDlg) tX}S[jdq  
  enum { IDD = IDD_ABOUTBOX }; DA@hf  
  //}}AFX_DATA / {~h?P}  
  // ClassWizard generated virtual function overrides lc#zS_  
  //{{AFX_VIRTUAL(CAboutDlg)  P;/wb /  
 protected: %-|q3 ^s  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support DN0b.*[`3  
  //}}AFX_VIRTUAL ,X6j$YLWp  
  // Implementation x^skoz  
 protected: oF^hq-xcP  
  //{{AFX_MSG(CAboutDlg) ,lM2BXz%  
  //}}AFX_MSG cBf{R^>Fd  
  DECLARE_MESSAGE_MAP() ^C| 9K>M  
}; _oVA0@#n  
Pk_{{Z(1o  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) J :(\o=5 5  
{ FWN%JCOj@  
 //{{AFX_DATA_INIT(CAboutDlg) <ft9B05*  
 //}}AFX_DATA_INIT 1\{F.v  
} X0TGJ,yW(  
gi >{`.]  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) aC 0Jfo  
{ X6 cb#s0|  
 CDialog::DoDataExchange(pDX); H;&t"Ql.  
 //{{AFX_DATA_MAP(CAboutDlg) .w)t<7 y  
 //}}AFX_DATA_MAP %;?3A#  
} Z`t?kXDNoI  
1=.kH[R  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 0E1)&f  
 //{{AFX_MSG_MAP(CAboutDlg) +[9"M+4-  
 // No message handlers XLxr~Yo  
 //}}AFX_MSG_MAP ~-i?=  
END_MESSAGE_MAP() *4y r7~S5  
tpK4 gjf  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) #ySx$WT;  
: CDialog(CCaptureDlg::IDD, pParent) $c47cJO)W  
{ Or>[_3  
 //{{AFX_DATA_INIT(CCaptureDlg) zxdO3I  
  m_bControl = FALSE; Jl ?Q}SB  
  m_bAlt = FALSE; KL`>mJo$  
  m_bShift = FALSE; v}D!  
  m_Path = _T("c:\\"); *?&O8SSBH  
  m_Number = _T("0 picture captured."); iK:]Q8b  
  nCount=0; )>p6h]]a  
  bRegistered=FALSE; >FNt*tX<0  
  bTray=FALSE; }iAi`_\0;  
 //}}AFX_DATA_INIT ~T9[\nU\  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 it vdzPO  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); RoRVu,1  
} iKY&gnu"  
_AHVMsz@  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) YfKty0  
{ V|7CYkB8  
 CDialog::DoDataExchange(pDX); 4/|=0TC;  
 //{{AFX_DATA_MAP(CCaptureDlg) UMaKvr-C&  
  DDX_Control(pDX, IDC_KEY, m_Key); ;v\n[  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); N/VIP0Kb  
  DDX_Check(pDX, IDC_ALT, m_bAlt); zY-m]7Yf  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); sA.yb,Fw  
  DDX_Text(pDX, IDC_PATH, m_Path); ` 454=3H  
  DDX_Text(pDX, IDC_NUMBER, m_Number); JM%#L*;  
 //}}AFX_DATA_MAP M czWg  
} rkl7p?  
YSif`W!  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) }1dh/Cc`  
//{{AFX_MSG_MAP(CCaptureDlg) Tp13V.|  
 ON_WM_SYSCOMMAND() LAeXe!y  
 ON_WM_PAINT() DBRJtU!5x  
 ON_WM_QUERYDRAGICON() }dM^6 Kd%  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) r N7"%dx  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse)  HV(Kz  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Jt8 v=<@  
//}}AFX_MSG_MAP !A o?bs'  
END_MESSAGE_MAP() lOui{QU  
yNL71>w4  
BOOL CCaptureDlg::OnInitDialog() 9iE66N>z  
{ :83" t-O8[  
 CDialog::OnInitDialog(); r "R\  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); D~:fn|/Brp  
 ASSERT(IDM_ABOUTBOX < 0xF000); s-B\8&^C  
 CMenu* pSysMenu = GetSystemMenu(FALSE); |*$_eb  
 if (pSysMenu != NULL) n6f|,D!?  
 { Y<v55m-  
  CString strAboutMenu; -,&Xp>u\  
  strAboutMenu.LoadString(IDS_ABOUTBOX); i_"I"5pBF  
  if (!strAboutMenu.IsEmpty()) xjN~Y D:  
  { Tx(R3B+u7  
   pSysMenu->AppendMenu(MF_SEPARATOR); f7'%AuSQ(  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); guvQISQlY  
  } F`u~Jx8.*  
 } y(k2p  
 SetIcon(m_hIcon, TRUE); // Set big icon Kf.b <wP{  
 SetIcon(m_hIcon, FALSE); // Set small icon 6X7_QBC)  
 m_Key.SetCurSel(0); (Wn'.|^%  
 RegisterHotkey(); H=jnCGk  
 CMenu* pMenu=GetSystemMenu(FALSE); V_* ^2c)  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); =j0V/=  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); [>;O'>  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); A?/?9Gr  
 return TRUE; // return TRUE unless you set the focus to a control zjmc>++<t  
} xcig'4L  
v6:DA#0  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) u#\3T>o%@  
{ $$@Tgkg?o  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ? &O$ayG77  
 { |}; ~YMH  
  CAboutDlg dlgAbout; 5h1j.t!  
  dlgAbout.DoModal(); w9%gaK;  
 } WxFjpJt  
 else qU}DOL|  
 { CS/-:>s%  
  CDialog::OnSysCommand(nID, lParam); N+\*:$>zt6  
 } abND#t  
} [H6>]&  
<T wq{kt  
void CCaptureDlg::OnPaint() s@$AYZm_  
{ >BX_Bou  
 if (IsIconic()) 1 wG1\9S  
 { llzl-2` /  
  CPaintDC dc(this); // device context for painting vl<J-+|0C  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 7XNfH@  
  // Center icon in client rectangle "hfwj`U  
  int cxIcon = GetSystemMetrics(SM_CXICON); I9 E@2[=!  
  int cyIcon = GetSystemMetrics(SM_CYICON); RA6D dqT~  
  CRect rect; C\{4<:<_&  
  GetClientRect(&rect); !cZsIcIe  
  int x = (rect.Width() - cxIcon + 1) / 2; xn"g_2Hi  
  int y = (rect.Height() - cyIcon + 1) / 2; ^tv*I~>J!  
  // Draw the icon NQG"}=KA  
  dc.DrawIcon(x, y, m_hIcon); Cv|:.y  
 } 9YJb~tuZ73  
 else b%kh:NV{S  
 { J: LSGj;R  
  CDialog::OnPaint(); i"'k|TGW^  
 } ^6*? a9jO>  
} 1jL?z6S  
1pV"< ,t  
HCURSOR CCaptureDlg::OnQueryDragIcon() R/#*~tPi8  
{ MWl@smRh  
 return (HCURSOR) m_hIcon; tT7$2 9  
} iB?@(10}ES  
Ur`v*LT}~  
void CCaptureDlg::OnCancel() =9c24j  
{ (:\hor%  
 if(bTray) 6-3l6q  
  DeleteIcon(); \; 3r  
  CDialog::OnCancel(); ?sO_c3^7z  
} 9K49<u0O  
c_iF S  
void CCaptureDlg::OnAbout() r#XDgZtI  
{ & zG=  
 CAboutDlg dlg; ;[xDc>&("Q  
 dlg.DoModal(); m[}$&i$(  
} R9W(MLe58  
7@sWT<P  
void CCaptureDlg::OnBrowse() <ESAoY"RPN  
{ 4Mprc~ 7vr  
 CString str; 3 !,%;Vz=  
 BROWSEINFO bi; #_E8>;)k  
 char name[MAX_PATH]; x!< C0N>?z  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 9xWrz;tzo  
 bi.hwndOwner=GetSafeHwnd(); , ?%`Ky/  
 bi.pszDisplayName=name; TX>;2S3q   
 bi.lpszTitle="Select folder"; B0Z@ Cf  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; rN}^^9  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); -X=f+4j  
 if(idl==NULL) 0`x<sjG\q  
  return; ecHy. 7H  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ?eu=0|d  
 str.ReleaseBuffer(); 3]!(^N>V  
 m_Path=str; L^=>)\R2$[  
 if(str.GetAt(str.GetLength()-1)!='\\') u7/M>YJ`T  
  m_Path+="\\"; {[$p}#7Y  
 UpdateData(FALSE); !B\\:k]aO^  
} G67BQG\av  
iz'8P-]K>  
void CCaptureDlg::SaveBmp() dI>oHMC  
{ k @ Hu0x  
 CDC dc; &8;mcM//4  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ENGw <  
 CBitmap bm; j'7FTVmJ  
 int Width=GetSystemMetrics(SM_CXSCREEN); 6wF ?FtT  
 int Height=GetSystemMetrics(SM_CYSCREEN); 8\yH 7H  
 bm.CreateCompatibleBitmap(&dc,Width,Height); #*9*[Xbi  
 CDC tdc; K9*K4'#R  
 tdc.CreateCompatibleDC(&dc); dWp4|r  
 CBitmap*pOld=tdc.SelectObject(&bm); 9Dpmp|  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Rn}+l[]jC  
 tdc.SelectObject(pOld); 9Kqr9U--v  
 BITMAP btm; T1x$v,)8x  
 bm.GetBitmap(&btm); F;zmq%rK  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; tHGK<rb  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); qYpHH!!C=  
 BITMAPINFOHEADER bih; x[vX|oE!A  
 bih.biBitCount=btm.bmBitsPixel; mU3UQ j  
 bih.biClrImportant=0; 2Two|E  
 bih.biClrUsed=0; %(NRH?  
 bih.biCompression=0; BjB2YO& /  
 bih.biHeight=btm.bmHeight; (s9?#t6  
 bih.biPlanes=1; 46 77uy  
 bih.biSize=sizeof(BITMAPINFOHEADER); S`J_}>  
 bih.biSizeImage=size; BFMM6-Ve  
 bih.biWidth=btm.bmWidth;  V C.r  
 bih.biXPelsPerMeter=0; _-D(N/  
 bih.biYPelsPerMeter=0; ic3qb<2  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ALKhZFuz  
 static int filecount=0; (Q @m;i>  
 CString name; o]]Q7S=  
 name.Format("pict%04d.bmp",filecount++); 4TLh'?Xu9  
 name=m_Path+name; ;BI{v^()s  
 BITMAPFILEHEADER bfh; a#kZY7s  
 bfh.bfReserved1=bfh.bfReserved2=0; K,So#Ui  
 bfh.bfType=((WORD)('M'<< 8)|'B'); @ O%m,  
 bfh.bfSize=54+size; xOkf 9k_  
 bfh.bfOffBits=54; E&97;VH  
 CFile bf; !Zs;m`j&9  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ? 56Zw"89  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); E=LaPjEIj  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 6!bf,T]  
  bf.WriteHuge(lpData,size); t rHj7Nw  
  bf.Close(); i1/FNem  
  nCount++; K46mE   
 } QJv,@@mu  
 GlobalFreePtr(lpData); B aXzz  
 if(nCount==1) HVC\(h,)i  
  m_Number.Format("%d picture captured.",nCount); D 0(gEb  
 else UboOIx5:  
  m_Number.Format("%d pictures captured.",nCount); :?60pu=  
  UpdateData(FALSE); @]cpPW-b  
} |C5i3?  
!x,3k\M  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) AKS(WNGEp  
{ -5E<BmM  
 if(pMsg -> message == WM_KEYDOWN) YN\ QwV  
 { !{SEm"J^  
  if(pMsg -> wParam == VK_ESCAPE) $CXqkK<6  
   return TRUE; \f+R!  
  if(pMsg -> wParam == VK_RETURN) (Q\w4?ci  
   return TRUE; 7}nOF{RH]  
 } /A_ IS`  
 return CDialog::PreTranslateMessage(pMsg); 9gWQGkql  
} a5&wS@) ;  
{B[i|(xQx  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Vv zd>yII  
{ 6H3_q x  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ z9VQsC'K  
  SaveBmp(); @m(\f  
  return FALSE; Ron^PvvY&  
} F9d][ P@@  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ?Ww',e  
 CMenu pop; 1Ce:<.99B  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); i~\gEMaO  
 CMenu*pMenu=pop.GetSubMenu(0); M>0~Ek%3  
 pMenu->SetDefaultItem(ID_EXITICON); xE+Go  
 CPoint pt; z muq4-.  
 GetCursorPos(&pt); hI?<F^b  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); {a>)VZw_#  
 if(id==ID_EXITICON) 6_9w1 ,W E  
  DeleteIcon(); \ 0:ITz  
 else if(id==ID_EXIT) AjZT- Q0L  
  OnCancel(); &qo'ge8p  
 return FALSE; EkJo.'0@  
} V,2O `D%  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); }}ogdq  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ;7qk9rz4  
 AddIcon(); k5<lkC2z  
 return res; {VI%]n{M  
} 5Lue.U%a  
8l?]UFM>C  
void CCaptureDlg::AddIcon() b#$:XS  
{ 4$_8#w B1&  
 NOTIFYICONDATA data; 'o5[ :=K  
 data.cbSize=sizeof(NOTIFYICONDATA); u D . 0?*_  
 CString tip; IMVoNKW-  
 tip.LoadString(IDS_ICONTIP); ^\x PF5  
 data.hIcon=GetIcon(0); C8(sH@  
 data.hWnd=GetSafeHwnd(); V @8X .R>  
 strcpy(data.szTip,tip); lMP|$C  
 data.uCallbackMessage=IDM_SHELL; \f._I+gJ  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Wmp\J3  
 data.uID=98; 1AhL-Lj  
 Shell_NotifyIcon(NIM_ADD,&data); J@1(2%)|Z  
 ShowWindow(SW_HIDE); 4,)=r3;&!  
 bTray=TRUE; y 5=J6a2.  
} !rrjA$P<v  
u} KiSZxt  
void CCaptureDlg::DeleteIcon() I</Nmgf  
{ ECl[v%R/6  
 NOTIFYICONDATA data; R4{}ZT  
 data.cbSize=sizeof(NOTIFYICONDATA); 1a%*X UT  
 data.hWnd=GetSafeHwnd(); I\4 I,ds  
 data.uID=98; ti'OjoJL  
 Shell_NotifyIcon(NIM_DELETE,&data); &M<431y  
 ShowWindow(SW_SHOW); 1f~_# EIC  
 SetForegroundWindow(); 6Q\n<&,{  
 ShowWindow(SW_SHOWNORMAL); #Xsby  
 bTray=FALSE; dU+1@_  
} ,(lD5iN  
Q}I. UG_  
void CCaptureDlg::OnChange() ;M}bQ88  
{ 2Q<_l*kk(  
 RegisterHotkey(); /x`H6'3?  
} `L:wx5?  
f!1K GP  
BOOL CCaptureDlg::RegisterHotkey() u,&Z5S  
{ W+Iln`L  
 UpdateData(); @Wdnc/o]  
 UCHAR mask=0; Z#\ \NfR  
 UCHAR key=0; # VR}6Jv  
 if(m_bControl) `GH6$\:  
  mask|=4; ncihc$V<  
 if(m_bAlt) ,/Xxj\i  
  mask|=2;  E?%k  
 if(m_bShift) 'zRd?Z>%  
  mask|=1; w}7`Vas9  
  key=Key_Table[m_Key.GetCurSel()]; w/ZV9"BhE  
 if(bRegistered){ FUMAvVQ  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); viKN:n! Ev  
  bRegistered=FALSE; [rGR1>U?i  
 } S,J'Z:spf  
 cMask=mask; M~3(4,  
 cKey=key; `t#C0  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 3{,Mpb@  
 return bRegistered; sp AYb<  
} c*LnLK/m  
[?;oiEe.|  
  四、小结 =(zk-J<nY  
`(16_a  
  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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