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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: `N7erM  
  REX/:sB<  
  一、实现方法 w3fD6$  
JqN$B\J,  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: ~d3BVKP5  
#N=_-  
#pragma data_seg("shareddata") ](ztb)  
HHOOK hHook =NULL; //钩子句柄 4Im}!q5;:<  
UINT nHookCount =0; //挂接的程序数目 )OlYz!#?  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 KJ-Q$ M  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 'r^'wv]  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey %74f6\  
static int KeyCount =0; N'5DB[:c:  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 RzB64  
#pragma data_seg() 03 v\v9<T  
HW6Cz>WxOW  
  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。 8,CL>*A  
0eCjK.   
  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: v!mP9c j  
eEmLl(Lb  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR -42 U  
cKey,UCHAR cMask) lvk*Db$  
{ 4uVyf^f\]f  
 BOOL bAdded=FALSE;  -x/g+T-  
 for(int index=0;index<MAX_KEY;index++){ ~F~hgVS5  
  if(hCallWnd[index]==0){ ov>`MCS,v  
   hCallWnd[index]=hWnd; zlh\P`  
   HotKey[index]=cKey; ws]d,]  
   HotKeyMask[index]=cMask; BIvz55g  
   bAdded=TRUE; Y(R],9h8  
   KeyCount++; `lO/I+8  
   break; Y k"yup@3  
  } +@rc(eOwvN  
 } V/"41  
 return bAdded; ;ZrFy=Iv  
} 5kv]k?   
//删除热键 )4+uM'2%  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) @ 6b;sv1W  
{ SYOU &*  
 BOOL bRemoved=FALSE; ?N%5c%oF  
 for(int index=0;index<MAX_KEY;index++){ mvtuV`  
  if(hCallWnd[index]==hWnd){ } 4>#s$.2  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ URTJA<r8D  
    hCallWnd[index]=NULL; 61TL]S8  
    HotKey[index]=0; S7hfwu&7F  
    HotKeyMask[index]=0; KkHlMwv  
    bRemoved=TRUE; 1[dQVJqMp(  
    KeyCount--; 4MgG]  
    break; } M\G  
   } wK%x|%R[  
  } ><@& &u.  
 } 69C ss'  
 return bRemoved; qkyYt#4E  
} u-dF ~.x  
7aN oqS+  
%A( hmC  
  DLL中的钩子函数如下: T~N877  
D <Fl7QAb  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 0I.!  
{ 'V Y\ut  
 BOOL bProcessed=FALSE; )4/UzR$  
 if(HC_ACTION==nCode) A`b )7+mB  
 { }% ?WS  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ;77q~_g$  
   switch(wParam) A'? W5~F  
   {   PuU<  
    case VK_MENU: Z~7}  
     MaskBits&=~ALTBIT; xWty2/!h  
     break; xm<sH!,j  
    case VK_CONTROL: uFi[50  
     MaskBits&=~CTRLBIT; ^m^,:]I0P  
     break; '8Lc}-M4  
    case VK_SHIFT: S>?B)  
     MaskBits&=~SHIFTBIT; *WXqN!:  
     break; yz=6 V%  
    default: //judge the key and send message ]GHx<5Q:\  
     break; i0&] Ig|;  
   } V P4ToYc  
   for(int index=0;index<MAX_KEY;index++){ i>rsq[l  
    if(hCallWnd[index]==NULL) " []J[!}x  
     continue; L2y{\<JC"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |.U- yyz  
    { ["?WVXCF8|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); < 'qtqUL\  
     bProcessed=TRUE; kI$p~  
    } V=H}Ecd  
   } `_+m3vHG  
  } OBp/:]  
  else if((lParam&0xc000ffff)==1){ //有键按下 %O&C\{J  
   switch(wParam) 27jZ~Bp$  
   { 0 :1ldU 4  
    case VK_MENU: L`Q9-#Y  
     MaskBits|=ALTBIT; `r8bBzr@%  
     break; D61e  
    case VK_CONTROL: }=."X8zOI8  
     MaskBits|=CTRLBIT; jLf87  
     break; GUK3`}!%  
    case VK_SHIFT: 4?&CK  
     MaskBits|=SHIFTBIT; Bc y$"F|r  
     break; gIXc-=Ut  
    default: //judge the key and send message qS+Ilg  
     break; S1n 'r}z8  
   } / k8;k56  
   for(int index=0;index<MAX_KEY;index++){ Y3wL EG%,:  
    if(hCallWnd[index]==NULL) /T2f~1R  
     continue; x?Oc<CQ-2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,TxZ:f`"  
    { uv dx>5]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); A&fh0E (t  
     bProcessed=TRUE; ^l/$ 13=  
    } } u7&SU  
   } UwxrYouv~@  
  } }GTy{Y*&  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 u~d&<_Z  
   for(int index=0;index<MAX_KEY;index++){ :WnXoL  
    if(hCallWnd[index]==NULL) TS<uBX  
     continue; Ycx$CU C  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) *Cgd?*\7  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); M+TF0c  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 H}c, P('  
   } \ow0Y >  
  } CSooJ1Ep~'  
 } jNNl5.  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); KPA5 X]  
} #0WO~wL  
t`mLZ <X  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: X_eV<]zA+  
DD hc^(  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ;nJCd1H  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Fk,3th  
*H RxC  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: O_PC/=m1@  
b\\?aR |  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) &WHEPdD  
{ F'#e]/V1  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) n%<.,(.(S  
 { o&~z8/?LA  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 #z t+U^#)  
  SaveBmp(); &4DV]9+g  
  return FALSE; {UYqRfgbZ  
 } }H ,A T  
 …… //其它处理及默认处理 5y"yd6O]O5  
} wL 5).`oq  
sEvJ!$Tt?I  
pp[? k}@  
  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。 {hRAR8  
1ck2Gxn  
  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。 Z?hBn`.  
W3 8 =fyD  
  二、编程步骤 qW<: `y  
{YbqB6zaM  
  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"; M3F8@|2  
a<gzI  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; n(f&uV_):  
a3lo;Cfp  
  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; :({lXGc}4?  
p-; ]O~^  
  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; % e1vq  
$C)@GGY  
  5、 添加代码,编译运行程序。 iQGoy@<R  
"3j0)  
三、程序代码 G:e}>'  
3^su%z_%  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL f (n{7  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) d) o<R;F  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ JrL/LGY  
#if _MSC_VER > 1000 "iZ-AG!C  
#pragma once LbYI{|_Js  
#endif // _MSC_VER > 1000 ?n@PZL= ]  
#ifndef __AFXWIN_H__ (%fGS.TR  
#error include 'stdafx.h' before including this file for PCH vP~F+z @g  
#endif " ^eq5?L  
#include "resource.h" // main symbols Q#g s)2  
class CHookApp : public CWinApp @xkM|N?  
{ _mkI;<d]$T  
 public: 6 3u'-Z"4  
  CHookApp(); )sS< %Xf  
  // Overrides @e0 Q+t  
  // ClassWizard generated virtual function overrides $0W0+A$  
  //{{AFX_VIRTUAL(CHookApp) 'b^:"\t'Rh  
 public: t=e0z^2i+  
  virtual BOOL InitInstance(); 2iG(v._x  
  virtual int ExitInstance(); D@JHi'F  
  //}}AFX_VIRTUAL -owfuS?i=  
  //{{AFX_MSG(CHookApp) #i ]@"R  
  // NOTE - the ClassWizard will add and remove member functions here. }> 1h+O  
  // DO NOT EDIT what you see in these blocks of generated code ! ~IWi @m{  
  //}}AFX_MSG 4rzioIk  
  DECLARE_MESSAGE_MAP() 462ae` 6l  
}; *r% mqAx(  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); g<dCUIbcQ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); +`4}bc ,G  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); #U_u~7?H$  
BOOL InitHotkey(); z~Pmh%b  
BOOL UnInit(); ``E;!r="v  
#endif fVN}7PH7+  
$cy:G  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. /pge7P  
#include "stdafx.h" ,/ig8~u'c  
#include "hook.h" =}"hC`3e  
#include <windowsx.h> 8 [."%rzN  
#ifdef _DEBUG m X1oRhf  
#define new DEBUG_NEW QNtr=  
#undef THIS_FILE bn(Scl#@K  
static char THIS_FILE[] = __FILE__; 7Rh:+bT  
#endif JX/d;N7a  
#define MAX_KEY 100 %5KR}NXX6  
#define CTRLBIT 0x04 ^#Y6 E  
#define ALTBIT 0x02 M!jW=^\  
#define SHIFTBIT 0x01 )Ud S (Bj  
#pragma data_seg("shareddata") qlxW@|  
HHOOK hHook =NULL; P3 Evv]sB@  
UINT nHookCount =0; Ni)#tz_9  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Zn} )&Xt  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ]`kvq0Gyb  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey }n 7e_qy4  
static int KeyCount =0; gdZVc9 _  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift i;xMf5Jz  
#pragma data_seg()  =*Yc/  
HINSTANCE hins; G7202(w <  
void VerifyWindow(); SWGa%6|  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) j`GbI0,bT  
//{{AFX_MSG_MAP(CHookApp) ,6bMf z  
// NOTE - the ClassWizard will add and remove mapping macros here. JS:lysu  
// DO NOT EDIT what you see in these blocks of generated code! D7(t6C=FP  
//}}AFX_MSG_MAP A X#!9-m3  
END_MESSAGE_MAP() U`Ag|R  
A-u5  
CHookApp::CHookApp() =iQm_g  
{  0EB'!  
 // TODO: add construction code here, X]*/]Xx  
 // Place all significant initialization in InitInstance (j I|F-i  
} @iceMD.  
3d<HIG^W}  
CHookApp theApp; H44&u](8{  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) |G@)B!>  
{ 3,5wWT] )  
 BOOL bProcessed=FALSE; T> 'Vaxo  
 if(HC_ACTION==nCode) Iz8 ^? >X  
 { !U!E_D.O  
  if((lParam&0xc0000000)==0xc0000000){// Key up 2"'8x?.V  
   switch(wParam) Cr%r<*s  
   { _Xv/S_yW  
    case VK_MENU: ;$E[u)l  
     MaskBits&=~ALTBIT; M(E_5@?3  
     break; *Kkw,qp/  
    case VK_CONTROL: 'nS3o.}  
     MaskBits&=~CTRLBIT; 6V?RES;X  
     break; 4<K`yU]"  
    case VK_SHIFT: *4:/<wI!  
     MaskBits&=~SHIFTBIT; xwxjj  
     break; z{jAt6@7  
    default: //judge the key and send message D5b _m|7%  
     break; c]r|I %D  
   } NKKO A  
   for(int index=0;index<MAX_KEY;index++){ g DG m32  
    if(hCallWnd[index]==NULL) NGs9Jke2  
     continue; oI~Qo*4eh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) zs:7!  
    { j1C.#-P[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); wg.fo:Q  
     bProcessed=TRUE; {wXN kq  
    } $:N "*  
   } |P7f^0idk  
  } o)=VPUe  
  else if((lParam&0xc000ffff)==1){ //Key down EI.Pk>ZIm  
   switch(wParam) =*}Mymhk(  
   { +|<&#b0Xd  
    case VK_MENU: aF"Z!HD  
     MaskBits|=ALTBIT; Hc%\9{zH  
     break; hF7mJ\  
    case VK_CONTROL: PcHFj+:  
     MaskBits|=CTRLBIT; )YtL=w?L'  
     break; 05 Q8`  
    case VK_SHIFT: y;Ln ao7i  
     MaskBits|=SHIFTBIT; pe%)G6@G  
     break; Ur(o&,  
    default: //judge the key and send message .6F3;bg R7  
     break; I?g__u=n~  
   } @qy*R'+  
   for(int index=0;index<MAX_KEY;index++) C+?s~JL  
   { AJd.K'=8  
    if(hCallWnd[index]==NULL) 'm5(MC,  
     continue; 7B!Qq/E?g  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <&%1pZ/6.  
    { C(HmLEB^  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 5a!e%jj  
     bProcessed=TRUE; y]_8. 0zM  
    } yN<fmi};c  
   } k1U8wdoT  
  } J_E(^+  
  if(!bProcessed){ f}Tr$r  
   for(int index=0;index<MAX_KEY;index++){ xt,L* B  
    if(hCallWnd[index]==NULL) ~*c=  
     continue; tB=D&L3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 4`P2FnJ?  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Sw@,<4S  
   } &E riskI  
  } "HfU,$[  
 } L{A-0Ffh  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ]</4#?_  
} +()t8,S,  
@H%=%ZwpO  
BOOL InitHotkey() WTYFtZD[yH  
{ |kNGpwpI  
 if(hHook!=NULL){ ls7A5 <  
  nHookCount++; U.7y8#qf3R  
  return TRUE; `N.$LY;8  
 } {3(.c, q@  
 else Z;~[@7`  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); E5BgQ5'  
  if(hHook!=NULL) LZC?383'  
   nHookCount++; y2$;t'  
  return (hHook!=NULL); 5 t`ap  
} ^+Vk#_2Q  
BOOL UnInit() ,Zf!KQw  
{ J-\?,4mcP  
 if(nHookCount>1){ !GGGh0Bj  
  nHookCount--; niHL/\7u  
  return TRUE; jJ"EGFa8  
 } T|s0qQi  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 71"JL",  
 if(unhooked==TRUE){ ERRT_G?  
  nHookCount=0; 53t- 'K0l  
  hHook=NULL; 8{<[fZyC  
 } .e2A*9,  
 return unhooked; %;\G@q_p{  
} `$sY^EX  
1H4Zgh U  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) %^5@z1d,  
{ )uid!d  
 BOOL bAdded=FALSE; {ogZT7w}  
 for(int index=0;index<MAX_KEY;index++){ n?LIphc\  
  if(hCallWnd[index]==0){ =8~R $z%  
   hCallWnd[index]=hWnd; YqSXi~.  
   HotKey[index]=cKey; r%,H*DOu  
   HotKeyMask[index]=cMask;  _7#tgZyv  
   bAdded=TRUE; I>%S4Z+o  
   KeyCount++; s9rtXBJP  
   break; d[]p_oIQq  
  } n1>,#|#  
 } v^c<`i;  
 return bAdded; z34>,0  
} 4iv]N 4  
#xP!!.DF(  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !b]2q%XM  
{ WTD49_px  
 BOOL bRemoved=FALSE; 6Z7pztk  
 for(int index=0;index<MAX_KEY;index++){ N~$Zeq=  
  if(hCallWnd[index]==hWnd){ ~kYqGH  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ytve1<.Ff  
    hCallWnd[index]=NULL; XJ h:U0  
    HotKey[index]=0; 7 ZL#f![{  
    HotKeyMask[index]=0; {y^|ET7  
    bRemoved=TRUE; )jk1S  
    KeyCount--; .FKJ yzL  
    break; W>0"CUp  
   } =`1m-   
  } -N7xO)  
 } k?HrD"k"  
 return bRemoved; }PFt  
} mUt,Z^ l`  
t*a*v;iz  
void VerifyWindow() t{X?PF\>o  
{ .'S^&M/$  
 for(int i=0;i<MAX_KEY;i++){ v<%kd[N  
  if(hCallWnd!=NULL){ '8l yj&  
   if(!IsWindow(hCallWnd)){ +qdIj] v  
    hCallWnd=NULL; R#/?AD&  
    HotKey=0; 3u4*ofjE5  
    HotKeyMask=0; ~y)bYG!G  
    KeyCount--; {M@@)27gW  
   } kPO6gdwq$  
  } bR'mV-2'  
 }  L%WME8PB  
} afY_9g!\  
e?!L}^f6X  
BOOL CHookApp::InitInstance() w#xeua|*I#  
{ 7<3U?]0  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ~ThVap[*  
 hins=AfxGetInstanceHandle(); 7?MB8tJ5r4  
 InitHotkey(); 5c]}G.NV  
 return CWinApp::InitInstance(); /^'Bgnez  
} MyH[vE^b  
G'O/JM  
int CHookApp::ExitInstance() 5 o#<`_=J  
{ {Z#e{~m#  
 VerifyWindow(); >I4p9y(u  
 UnInit(); ^XBzZ!h|  
 return CWinApp::ExitInstance(); ^Ti_<<X  
} -^iUVO`z  
$Ns,ts(ng  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file rBD(2M  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 2$ |]Vj*Zs  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 3I"NI.>*  
#if _MSC_VER > 1000 *K(k Kph  
#pragma once +}^|dkc  
#endif // _MSC_VER > 1000 W|25t)cJ8h  
!/j,hO4Z4  
class CCaptureDlg : public CDialog w; 4jx(  
{ iiX\it$s  
 // Construction %kh#{*q$  
 public: Q(510)  
  BOOL bTray; u^Nxvx3l0  
  BOOL bRegistered; <vB<`   
  BOOL RegisterHotkey(); }bf=Ntk  
  UCHAR cKey; bmOqeUgB  
  UCHAR cMask; OXHvT/L`  
  void DeleteIcon(); C$<"w,  
  void AddIcon(); VEj$^bpp5s  
  UINT nCount; uf)W-Er6~  
  void SaveBmp(); J7BFk ?=  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ryxYcEM0  
  // Dialog Data +T0op4  
  //{{AFX_DATA(CCaptureDlg) O' +"d%2'  
  enum { IDD = IDD_CAPTURE_DIALOG }; Q2/MnM  
  CComboBox m_Key; L[?nST18%  
  BOOL m_bControl; H8@8MFz\  
  BOOL m_bAlt; "z^(dF|  
  BOOL m_bShift; q,B3ru.?d  
  CString m_Path; e>l,(ql  
  CString m_Number; FR x6c  
  //}}AFX_DATA E *F*nd]K  
  // ClassWizard generated virtual function overrides 9>by~4An?  
  //{{AFX_VIRTUAL(CCaptureDlg) A4G,}r *n  
 public: Ia629gi5s  
  virtual BOOL PreTranslateMessage(MSG* pMsg); `)R?nV b   
 protected: AF^T~?t  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support RU2c*q$^X  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); HH)"]E5  
  //}}AFX_VIRTUAL 9W!8gCs  
  // Implementation <B6[i*&  
 protected: yu)q4C7ek  
  HICON m_hIcon; Q>.BQ;q]  
  // Generated message map functions ^Q0&.hL@  
  //{{AFX_MSG(CCaptureDlg) ?Jt$a;  
  virtual BOOL OnInitDialog(); t5.`! 3EO  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); X rF3kz!44  
  afx_msg void OnPaint(); $<B +K  
  afx_msg HCURSOR OnQueryDragIcon(); 1O |V=K  
  virtual void OnCancel(); |G(1[RNu  
  afx_msg void OnAbout(); ?c!:81+\  
  afx_msg void OnBrowse(); Dv&>*0B  
  afx_msg void OnChange(); xS'zZ%?  
 //}}AFX_MSG F4Zn5&.)  
 DECLARE_MESSAGE_MAP() i+f7  
}; A\K,_&x1Z  
#endif )^4hQ3BS  
NYBe"/}GS  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file KOjluP  
#include "stdafx.h" gQ37>  
#include "Capture.h" 0rD#s{?   
#include "CaptureDlg.h" 57~Uqt  
#include <windowsx.h> x97L6!  
#pragma comment(lib,"hook.lib") No) m/17y  
#ifdef _DEBUG N{8"s&  
#define new DEBUG_NEW -G9|n#zCU  
#undef THIS_FILE G.g|jP'n  
static char THIS_FILE[] = __FILE__; iq?l#}]  
#endif eNRs&^  
#define IDM_SHELL WM_USER+1 !X|k"km"  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); mwh{"FL(  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); oid[syPB  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; $;2)s} ci  
class CAboutDlg : public CDialog o(*F])d;  
{ "O*x' XhN  
 public: |; $Bb866/  
  CAboutDlg(); fN-Gk(Ic  
  // Dialog Data -ynBi;nH  
  //{{AFX_DATA(CAboutDlg) 1dFa@<5  
  enum { IDD = IDD_ABOUTBOX }; V<8K@/n@  
  //}}AFX_DATA 62[8xn=(%  
  // ClassWizard generated virtual function overrides 740B\pc0  
  //{{AFX_VIRTUAL(CAboutDlg) m9$a"$c  
 protected: )6{< i5nJ\  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Nt]qVwUm'Y  
  //}}AFX_VIRTUAL fc@'9- pt  
  // Implementation $X \va?(  
 protected: ["y6b*;x  
  //{{AFX_MSG(CAboutDlg) 9#7J:PfZ<  
  //}}AFX_MSG zB*euHIqZ  
  DECLARE_MESSAGE_MAP() W|MWXs5'1*  
}; hN   
- v]Qhf&>  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) )%mg(O8uL  
{ s)zJT  
 //{{AFX_DATA_INIT(CAboutDlg) }`xdWY  
 //}}AFX_DATA_INIT dAc ?O-~  
} 2*[QZ9U[@  
5RF4]$zT  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 0,_b)  
{ ;o0#(xVz  
 CDialog::DoDataExchange(pDX); %@?A_jS  
 //{{AFX_DATA_MAP(CAboutDlg) TVaA>]Fv  
 //}}AFX_DATA_MAP kA4@`YCl  
} rn8cdM N  
xzsdG?P  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) IA4N@ijRxh  
 //{{AFX_MSG_MAP(CAboutDlg) .2W"w)$nuq  
 // No message handlers 1l5J P|x  
 //}}AFX_MSG_MAP d"E^SBO&  
END_MESSAGE_MAP() 0*8TS7.3  
4zjs!AK%  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 5G[x}4U  
: CDialog(CCaptureDlg::IDD, pParent) xCXQ<77  
{ Ooc\1lX  
 //{{AFX_DATA_INIT(CCaptureDlg) Z^yNLF*&V  
  m_bControl = FALSE; " .4,."  
  m_bAlt = FALSE; m^V5*JIh  
  m_bShift = FALSE; _V2xA88  
  m_Path = _T("c:\\"); |A\a4f 'G  
  m_Number = _T("0 picture captured."); "?3`  
  nCount=0; !E2W\chi  
  bRegistered=FALSE; ;),"M{"v  
  bTray=FALSE; Es!Q8.  
 //}}AFX_DATA_INIT k GHQ`h  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 F]EBD8/b  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ;AX8aw,  
} xwi\  
VwyVEZt  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) yVX8e I  
{ D:"{g|nW}  
 CDialog::DoDataExchange(pDX); d%_OT0Ei  
 //{{AFX_DATA_MAP(CCaptureDlg) s?2$ue&-f  
  DDX_Control(pDX, IDC_KEY, m_Key); \?**2{9&)  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Kcy@$uF{2  
  DDX_Check(pDX, IDC_ALT, m_bAlt); [;A[.&6  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); IgIYguQ   
  DDX_Text(pDX, IDC_PATH, m_Path); /mA,F;   
  DDX_Text(pDX, IDC_NUMBER, m_Number); X6\ sF"E  
 //}}AFX_DATA_MAP =-"c*^$]  
} NX[4PKJ0C  
/Fgw$ ^H  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) -F@L}|  
//{{AFX_MSG_MAP(CCaptureDlg) aC%&U4OS  
 ON_WM_SYSCOMMAND() @n -r-Q  
 ON_WM_PAINT() t)f-mQz)  
 ON_WM_QUERYDRAGICON() S<`I Jpkv  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) e}hmS1>H  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 'n;OB4  
 ON_BN_CLICKED(ID_CHANGE, OnChange) )G~w[~  
//}}AFX_MSG_MAP Ts.wh>`  
END_MESSAGE_MAP() 8|6 4R:  
x79Ha,  
BOOL CCaptureDlg::OnInitDialog() <\ `$Jx#  
{ I_1e?\  
 CDialog::OnInitDialog(); I%j_"r9-I  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); PPkx4S_>  
 ASSERT(IDM_ABOUTBOX < 0xF000); b2,!g }I  
 CMenu* pSysMenu = GetSystemMenu(FALSE); g[H',)A)  
 if (pSysMenu != NULL) nKoiG*PI  
 { |~!U4D\  
  CString strAboutMenu; t]aea*B  
  strAboutMenu.LoadString(IDS_ABOUTBOX); qIIJ4n  
  if (!strAboutMenu.IsEmpty()) 8CbXMT  
  { X5LBEOG  
   pSysMenu->AppendMenu(MF_SEPARATOR); n_?tN\M  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 3"N)xO-  
  } \xv;sl$f  
 } Fqy\CMC  
 SetIcon(m_hIcon, TRUE); // Set big icon U;N:j8  
 SetIcon(m_hIcon, FALSE); // Set small icon 8[vc?+>&  
 m_Key.SetCurSel(0); /D! ;u]  
 RegisterHotkey(); M{g%cR0  
 CMenu* pMenu=GetSystemMenu(FALSE); */:uV B,b2  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); >-8cU_m7s  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Zf$Np50@(  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); qz?mh4Oh  
 return TRUE; // return TRUE unless you set the focus to a control M(x$xAiD  
} b~=0[Rv  
t>=fTkB  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) &i+Ce  
{ Rk!X]-`=  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) WOzf]3Xcj  
 { JjaoOe  
  CAboutDlg dlgAbout; i4Lc$20?d  
  dlgAbout.DoModal(); #7ohQrP  
 } [e[<p\]  
 else I9h ?;(  
 { H0m|1 7  
  CDialog::OnSysCommand(nID, lParam); tW WWx~k  
 } KlRr8 G!Z  
} yY?b.ty  
Gx`Lks  
void CCaptureDlg::OnPaint() wLK07e(  
{ (e(:P~Ry  
 if (IsIconic()) <-D/O$q  
 { ^8.]d~j  
  CPaintDC dc(this); // device context for painting YIw1  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 1`ayc|9BR  
  // Center icon in client rectangle 'AN>`\mR$  
  int cxIcon = GetSystemMetrics(SM_CXICON); =[b)1FUp  
  int cyIcon = GetSystemMetrics(SM_CYICON); RuII!}*  
  CRect rect; /1Ue?)g  
  GetClientRect(&rect); ck?YI]q|  
  int x = (rect.Width() - cxIcon + 1) / 2; okbQ<{9  
  int y = (rect.Height() - cyIcon + 1) / 2; DC{>TC[p1k  
  // Draw the icon ,) J~,^f6  
  dc.DrawIcon(x, y, m_hIcon); 9IX/wm"  
 } lXcx@#~  
 else o2<#s)GpY  
 { :oJ=iB'Zc  
  CDialog::OnPaint(); 'Ut7{rZ5  
 } hjZKUM G(k  
} 'yMF~r3J  
"g$IP9?U  
HCURSOR CCaptureDlg::OnQueryDragIcon() /p8dZ+X  
{ O,Cb"{qH8  
 return (HCURSOR) m_hIcon; nBk)WX&[K  
} uj :%#u  
BNL;Biy t7  
void CCaptureDlg::OnCancel() uEX!xx?Q#  
{ JvY}-}?c  
 if(bTray) H$y-8-&)  
  DeleteIcon(); /~zai}  
  CDialog::OnCancel(); yUpgoX(6  
} FCnm1x#  
H1} RWaJ  
void CCaptureDlg::OnAbout() (1#J%  
{ Q%xC}||1s"  
 CAboutDlg dlg; %i5M77#Z  
 dlg.DoModal(); vM5k_D  
} 6I%5Q4Ll  
e)(wss+d7P  
void CCaptureDlg::OnBrowse() nDHTV !]<  
{ oH_;4QU4y  
 CString str; 'FDef#P<  
 BROWSEINFO bi; =weSyZ1~  
 char name[MAX_PATH]; Mnscb  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 2nR[Xh?L  
 bi.hwndOwner=GetSafeHwnd(); k |eBJ%  
 bi.pszDisplayName=name; /Njd[= B  
 bi.lpszTitle="Select folder"; g*_cP U0~m  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; VIv&ofyAR  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 0N $v"uX@  
 if(idl==NULL) dw*_(ys  
  return; XCBL}pNkR  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); g"}%2~Urf  
 str.ReleaseBuffer(); 0$ S8 fF@  
 m_Path=str; NxsBX :XDn  
 if(str.GetAt(str.GetLength()-1)!='\\') >U[j]V]  
  m_Path+="\\"; %^ !,t:d  
 UpdateData(FALSE); JU)dr4S?  
} v_DedVhe  
YB2VcF.LU  
void CCaptureDlg::SaveBmp() JsODzw  
{ ^zQ/mo,Z  
 CDC dc; 8|\8O@  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); a6uJYhS~  
 CBitmap bm; |>dI/_'  
 int Width=GetSystemMetrics(SM_CXSCREEN); =w{Z@S(ukz  
 int Height=GetSystemMetrics(SM_CYSCREEN); vkri+:S3  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Zcx`SC-0  
 CDC tdc; _sTROd)Vh  
 tdc.CreateCompatibleDC(&dc); )8$=C#qC[  
 CBitmap*pOld=tdc.SelectObject(&bm); ^G}47(  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); rR(X9i  
 tdc.SelectObject(pOld); % ~H=sjg  
 BITMAP btm; iMDM1}b  
 bm.GetBitmap(&btm); ~kEI4}O  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; uFinv2Z '  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); |R/%D%_g  
 BITMAPINFOHEADER bih; A;]}m8(*  
 bih.biBitCount=btm.bmBitsPixel; 1=d6NX)B  
 bih.biClrImportant=0; \D*KGd]M0  
 bih.biClrUsed=0; 62ws/8d6f  
 bih.biCompression=0; Yp^rR }N  
 bih.biHeight=btm.bmHeight; +[\FD; >  
 bih.biPlanes=1; `T5W}p[6  
 bih.biSize=sizeof(BITMAPINFOHEADER); ]1#e#M]#  
 bih.biSizeImage=size; Yfzl%wc  
 bih.biWidth=btm.bmWidth; Ju1D = b  
 bih.biXPelsPerMeter=0; @~"h62=] -  
 bih.biYPelsPerMeter=0; j~[z2tV  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); H[U!%Z  
 static int filecount=0; 3cK I  
 CString name; 0tT(W^ho g  
 name.Format("pict%04d.bmp",filecount++); :&V h?  
 name=m_Path+name; ?kbiMs1;u  
 BITMAPFILEHEADER bfh; c7x~{V8  
 bfh.bfReserved1=bfh.bfReserved2=0; 4R1<nZ"e~  
 bfh.bfType=((WORD)('M'<< 8)|'B'); vunHNHltW0  
 bfh.bfSize=54+size; Lr~=^{  
 bfh.bfOffBits=54; CYY=R'1:G{  
 CFile bf; $QLcH;+7t  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 8 Hg+H=?  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 2fn&#kw/  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 0=2@  
  bf.WriteHuge(lpData,size); b*c*r dTx  
  bf.Close(); *zb Nd:i9  
  nCount++; A>o *t=5  
 } 5K>3My#  
 GlobalFreePtr(lpData); ~j}cyHg  
 if(nCount==1) 5m&9"T.w  
  m_Number.Format("%d picture captured.",nCount); nrub*BuA  
 else JfLqtXF[&"  
  m_Number.Format("%d pictures captured.",nCount); l5!|I:/*;  
  UpdateData(FALSE); @tNzQ8  
} R;uvkg[o  
FKDk+ojw  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) FWrX3i  
{ SB H(y)  
 if(pMsg -> message == WM_KEYDOWN) C zs8!S  
 { 1\ o59Y  
  if(pMsg -> wParam == VK_ESCAPE) Yg%I?  
   return TRUE; v&DI`xn~  
  if(pMsg -> wParam == VK_RETURN)  ]hk  
   return TRUE; )r xX+k+b/  
 } `ZYoA t]C~  
 return CDialog::PreTranslateMessage(pMsg); V5V bJBpf  
} /Kql>$I  
gY/"cq  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) {Aw#?#GPW  
{ iT3BF"ZqBO  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ /R]U}o^/(%  
  SaveBmp(); tdBm (CsN  
  return FALSE; N +Yxz;Mg  
} N} G[7Rp8l  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ zy/@ WFPE  
 CMenu pop; a*lh)l<KV  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); pjKWtY@=X  
 CMenu*pMenu=pop.GetSubMenu(0); `VA"vwz  
 pMenu->SetDefaultItem(ID_EXITICON); =Y{(%sn  
 CPoint pt; 89pEfl j2  
 GetCursorPos(&pt); %g{X?  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); h7G"G"  
 if(id==ID_EXITICON) V_ :1EBzz  
  DeleteIcon(); 4;e5H_}Oo  
 else if(id==ID_EXIT) p& y<I6a,  
  OnCancel(); AYqX |  
 return FALSE; ey7 f9  
} +h|`/ &,  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Xv ]W(f1  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) +~m46eI  
 AddIcon(); N)uSG&S:  
 return res; 6Zm# bFQ  
} q;T{|5/O  
x9UX!Z5*>  
void CCaptureDlg::AddIcon() L iN$ pwm  
{ 2V mNZ{<  
 NOTIFYICONDATA data; LO9=xGj.  
 data.cbSize=sizeof(NOTIFYICONDATA); cLpYW7vZ[  
 CString tip; ?pW`cFLDHF  
 tip.LoadString(IDS_ICONTIP); GZN ^k+w  
 data.hIcon=GetIcon(0); eVjBGJ=2e  
 data.hWnd=GetSafeHwnd(); <=zQ NBtx  
 strcpy(data.szTip,tip); n\Z!ff/  
 data.uCallbackMessage=IDM_SHELL; _<n~n]%  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ZCMw3]*  
 data.uID=98; w1EXh  
 Shell_NotifyIcon(NIM_ADD,&data); '\l"   
 ShowWindow(SW_HIDE); "jeb%k  
 bTray=TRUE; j/323Za+  
} `uv2H$  
W#9BNKL  
void CCaptureDlg::DeleteIcon() u_w#gjiC  
{ 2Q/x@aT,h  
 NOTIFYICONDATA data; 2e+UM$  
 data.cbSize=sizeof(NOTIFYICONDATA); SE@LYeC}dE  
 data.hWnd=GetSafeHwnd(); hO\<%0F  
 data.uID=98; .F4>p=r  
 Shell_NotifyIcon(NIM_DELETE,&data); GFj{K  
 ShowWindow(SW_SHOW); =)0,#9k U]  
 SetForegroundWindow(); }NHaCG[,  
 ShowWindow(SW_SHOWNORMAL); 5;tD"/nz  
 bTray=FALSE; s 1 A.+  
} pA'4|ffwe  
zqimR#u  
void CCaptureDlg::OnChange() cvn@/qBq*t  
{ "%`1 ]Fr  
 RegisterHotkey(); dU&a{ $ku[  
} <Th6r.#?  
yZ0-wI  
BOOL CCaptureDlg::RegisterHotkey() g!g#]9j  
{ jD$,.AVvz  
 UpdateData(); "@e3EX7h  
 UCHAR mask=0; =_.l8IYX$%  
 UCHAR key=0; dN$0OS`s[  
 if(m_bControl) y;35WtDVb  
  mask|=4; j+i\bks  
 if(m_bAlt) G,&<<2{(f;  
  mask|=2; 7-bd9uVK  
 if(m_bShift) F&!6jv  
  mask|=1; B~1 _28\  
  key=Key_Table[m_Key.GetCurSel()]; H4WP~(__  
 if(bRegistered){ >6ni")Q9  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask);  :|>h7v  
  bRegistered=FALSE; G)EU_UE 9  
 } 8zZvht*  
 cMask=mask; 3@etRd;]Kr  
 cKey=key; \\iQEy<i  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); &PR5q 7  
 return bRegistered; VACQ+  
} &|s0P   
R6` WN  
  四、小结 iOd&B B6  
<wk!hTm W  
  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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