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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: nT.i|(xd.  
  v%gkQa  
  一、实现方法 cm`Jr#kl{  
5[<" _  
  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: _XLGXJ[B  
J^t-pU  
#pragma data_seg("shareddata") .W4P/P w'  
HHOOK hHook =NULL; //钩子句柄 -|s w\Q  
UINT nHookCount =0; //挂接的程序数目 mO];+=3v8  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 39 D!e&  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Cu*+E%P9`  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey SM%N ]/@U  
static int KeyCount =0; 7wKN  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 FKhmg&+>  
#pragma data_seg() !h\.w9o[  
b EB3 #uc  
  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。 kw,eTB<;R  
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  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: @)[Q6w`x  
+XL^dzN[|$  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Da.eVU;  
cKey,UCHAR cMask) U$zd3a_(  
{ vTE3-v[i  
 BOOL bAdded=FALSE; S$O+p&!X  
 for(int index=0;index<MAX_KEY;index++){ $;GH -+  
  if(hCallWnd[index]==0){ i_/A,5TF  
   hCallWnd[index]=hWnd; 25e*W>SLw  
   HotKey[index]=cKey; OH.lAF4E(  
   HotKeyMask[index]=cMask; 'OrGt_U  
   bAdded=TRUE; 7 'T3W c  
   KeyCount++; (i..7B:  
   break; ylFoYROO  
  } \gz(C`4{j  
 } ^,W;dM2  
 return bAdded; S*"uXTS  
} -"Mq<XO&51  
//删除热键 ].AAHu5  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) <Wd#HKIG>l  
{ h2k"iO }  
 BOOL bRemoved=FALSE; 6}z-X*  
 for(int index=0;index<MAX_KEY;index++){ ZLP)i;Az  
  if(hCallWnd[index]==hWnd){ +pcGxje\  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ^"lVTDsU  
    hCallWnd[index]=NULL; (^_j,4  
    HotKey[index]=0; 3C[#_&_l  
    HotKeyMask[index]=0; ~PaEhj&8  
    bRemoved=TRUE; /\7E&n:)2  
    KeyCount--; IKaa=r~  
    break; R y47Fze  
   } CjFnE   
  } `!BP.-Zv  
 } FX1[ 2\  
 return bRemoved; "2l$}G  
} "Zh3,  
P8& BtA  
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  DLL中的钩子函数如下: RA];hQI?  
o]R*6$  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) '{>R-}o[3  
{ 1>~bzXY#  
 BOOL bProcessed=FALSE; 0H9UM*O  
 if(HC_ACTION==nCode) G4&vrM,f  
 { e\8|6< o[  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 \&!qw[;O  
   switch(wParam) k-V3l  
   {  X }V}%  
    case VK_MENU: gWK[%.Jnw  
     MaskBits&=~ALTBIT; .}n-N #  
     break; 19h@fA[:  
    case VK_CONTROL: #gq!L  
     MaskBits&=~CTRLBIT; 5%r:hO @S  
     break; 7.mYzl-F(  
    case VK_SHIFT: *JD-|m K  
     MaskBits&=~SHIFTBIT; If>bE!_BO  
     break; )44c[Z  
    default: //judge the key and send message ,1K`w:uhS  
     break; _O,k0O   
   } Q[n*ce7L0  
   for(int index=0;index<MAX_KEY;index++){ }Fq~!D Ee  
    if(hCallWnd[index]==NULL) f (Su  
     continue; Xp67l!{v  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >TQNrS^$J  
    { s~p(59  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ;2y4^  
     bProcessed=TRUE; =&K8~   
    } iNCT(N~.  
   } f>CJ1 ;][{  
  } <q`'[1Y4  
  else if((lParam&0xc000ffff)==1){ //有键按下 7Gwo:s L  
   switch(wParam) oKMr Pr[`  
   { ]&;K:#J  
    case VK_MENU: ?-v]+<$Y  
     MaskBits|=ALTBIT; =w5]o@  
     break; P Dgd'y  
    case VK_CONTROL: ,J&\) yTP  
     MaskBits|=CTRLBIT; \{EYkk0]  
     break; xqQLri}  
    case VK_SHIFT: -HU4Ow  
     MaskBits|=SHIFTBIT; H`bS::JI-  
     break; iSP}kM}  
    default: //judge the key and send message #3knKBH  
     break; A8X3|<n=  
   } \\ZCi`O  
   for(int index=0;index<MAX_KEY;index++){ ]N;\AXZ7  
    if(hCallWnd[index]==NULL) ;5 p;i 8m  
     continue; ;F;Vm$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =]fOQN`  
    { $TX]*hNn  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); -=W Qed}  
     bProcessed=TRUE; s-801JpiJ  
    } LrH"d  
   } 64UrD{$o  
  } A\w"!tNM|  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ucYweXsO3  
   for(int index=0;index<MAX_KEY;index++){ 5 W!#,jz  
    if(hCallWnd[index]==NULL) dQs>=(|t  
     continue; a=4 `C*)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) nw-%!}Ot"  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); tMiy`CPh  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 *djVOC  
   } ) ^`V{iD  
  } G]n_RP$G  
 }  Al1}Ir   
 return CallNextHookEx( hHook, nCode, wParam, lParam ); tbXl5x0  
} _)S['[  
8F K%7\V  
  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: %M,^)lRP  
6z5wFzJv?q  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); F};T<#  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); P84= .* >  
%-KgR  
  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: w `nm}4M  
qi*Dd[OG  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) &n'@L9v81  
{ IhHKRb[  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) RT. %\)))  
 { Alk+MwjR  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 `t"7[Zk  
  SaveBmp(); u]*f^/6Q  
  return FALSE; l@0${&n  
 } Vq599M:)V  
 …… //其它处理及默认处理 l* z "wA-  
} BJgHel+N  
+bGO"*  
PjP6^"  
  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。 9H/C(Vo  
P=aYwmC  
  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。 TbD $lx3>  
6j Rewj  
  二、编程步骤 I|l5e2j  
9vP#/ -g  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; '=`af>Nc  
-(},%!-_  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; }9V0Cu1  
^WrL   
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; P(.XB`  
;@*<M\O  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; {%\@Z-9%q,  
*nK4XgD  
  5、 添加代码,编译运行程序。 lA` qB1x  
dZY|6  
三、程序代码 rJ{k1H>  
Z,DSTP\|  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 8!{ }WLwb  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) u+O"c  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ KF6N P  
#if _MSC_VER > 1000 ]9-iEQ  
#pragma once PXG@]$~3  
#endif // _MSC_VER > 1000 bcUSjG>  
#ifndef __AFXWIN_H__ o:B?hr'\  
#error include 'stdafx.h' before including this file for PCH &]tm 'N25  
#endif 3+\Zom4  
#include "resource.h" // main symbols Z*b$&nM  
class CHookApp : public CWinApp 'jXJ!GFw  
{ f _Hh"Vh  
 public: @?jbah#  
  CHookApp(); #iQF)x| D  
  // Overrides 'h@&rr@5  
  // ClassWizard generated virtual function overrides oE_*hp+  
  //{{AFX_VIRTUAL(CHookApp) v 8EI   
 public: Nt;1&dwUb  
  virtual BOOL InitInstance(); (f2r4Io|}  
  virtual int ExitInstance(); _F(Np\%_  
  //}}AFX_VIRTUAL ^ E_chx-e}  
  //{{AFX_MSG(CHookApp) _f~$iY  
  // NOTE - the ClassWizard will add and remove member functions here. bk1.H@8  
  // DO NOT EDIT what you see in these blocks of generated code ! yFn~rv|&G  
  //}}AFX_MSG ILx4 [m7  
  DECLARE_MESSAGE_MAP() )%b 5uZ  
}; Vry*=X &Q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 2r!- zEV  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); qnb/zr)p  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Z^BZH/I?  
BOOL InitHotkey(); ;<*%BtD?  
BOOL UnInit(); j rxq558  
#endif wA"d?x  
v$xurj:v#i  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. =4sx(<  
#include "stdafx.h" /x)i}M)  
#include "hook.h" @r^s70{}  
#include <windowsx.h> l$ kO%E'  
#ifdef _DEBUG | N}*  
#define new DEBUG_NEW ;Ea8>  
#undef THIS_FILE dq%C~j{v  
static char THIS_FILE[] = __FILE__; })`z6d]3  
#endif )w5!'W4Z8  
#define MAX_KEY 100 &'`ki0Xh;  
#define CTRLBIT 0x04 NHQoP&OG  
#define ALTBIT 0x02 yVQW|D0,j  
#define SHIFTBIT 0x01 .<E7Ey#  
#pragma data_seg("shareddata") 1JJ1!& >  
HHOOK hHook =NULL; $ce*W 9`  
UINT nHookCount =0; Ly/  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 0176  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT @FZ_[CYg  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ~N/a\%`  
static int KeyCount =0; *&I _fAh]  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift >K&chg@Hv  
#pragma data_seg() .'.bokl/  
HINSTANCE hins; |26[=_[q  
void VerifyWindow(); h:|BQC  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) :0ltq><?  
//{{AFX_MSG_MAP(CHookApp) (sI`FW_  
// NOTE - the ClassWizard will add and remove mapping macros here. hT,rcIkg:  
// DO NOT EDIT what you see in these blocks of generated code! '? -N  
//}}AFX_MSG_MAP 5wdKu,nq  
END_MESSAGE_MAP() P_b!^sq9  
w ~"%&SNN  
CHookApp::CHookApp() E^gN]Z"O  
{ ?bu=QV@  
 // TODO: add construction code here, p5py3k  
 // Place all significant initialization in InitInstance )*R';/zaI  
} M IyT9",Pl  
,6#%+u}f  
CHookApp theApp; WJ)4rQ$o  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) .LDp.#d9r1  
{ LitdO>%#2  
 BOOL bProcessed=FALSE; k ]T  
 if(HC_ACTION==nCode) .XkD2~;  
 { }#; .b'`  
  if((lParam&0xc0000000)==0xc0000000){// Key up *>`6{0, 9  
   switch(wParam) @h_ bXo  
   { ,`OQAJ)>  
    case VK_MENU: 4;>HBCM4-  
     MaskBits&=~ALTBIT; oX*;iS X  
     break; lWd@  
    case VK_CONTROL: ,jtaTG.>  
     MaskBits&=~CTRLBIT; +Wgfxk'{  
     break; \YFM5l;IU  
    case VK_SHIFT: OHW|?hI=[  
     MaskBits&=~SHIFTBIT; @ULWVS#t2  
     break; /2hRL yeAZ  
    default: //judge the key and send message Q&+)Kp]A  
     break; ?RIf0;G  
   } h@'CmIZc  
   for(int index=0;index<MAX_KEY;index++){ 34[TM3L].  
    if(hCallWnd[index]==NULL) *-(o. !#1  
     continue; Ycx}FYTY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) xt IF)M  
    { #_`q bIOAj  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); eMdf [eS  
     bProcessed=TRUE; hSXJDT2  
    } K3UN#G)U  
   } C@\5%~tW+  
  } @$t\yBSK  
  else if((lParam&0xc000ffff)==1){ //Key down ?Bl/bY$*h  
   switch(wParam) H'7s`^- >I  
   { B[6k [Vs  
    case VK_MENU: @HSK[[?  
     MaskBits|=ALTBIT; ;<;~;od*/  
     break; '\+"3!$  
    case VK_CONTROL: Wv9L }@J  
     MaskBits|=CTRLBIT; * hS6F  
     break; +A^|aQ  
    case VK_SHIFT: r b\t0tg  
     MaskBits|=SHIFTBIT; 2_6ON   
     break; h:U#F )  
    default: //judge the key and send message aG]^8`~>'  
     break; }%jpqip  
   } U 8p %MFD  
   for(int index=0;index<MAX_KEY;index++) .Pte}pM"v  
   { 6w(r}yO]  
    if(hCallWnd[index]==NULL) En#Q p3  
     continue; _d!o,=}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $-~"G,;F  
    { ,nCvA%B!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); CWRB/WH:  
     bProcessed=TRUE;  +Mhk<A[s  
    } %W2U$I5  
   } f [.'V1  
  } rlawH}1b  
  if(!bProcessed){ ~Hv>^u Mh  
   for(int index=0;index<MAX_KEY;index++){ J .TK<!  
    if(hCallWnd[index]==NULL) $~/cxLcT  
     continue; r\FZ-gk}Q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Ewq@>$_!  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); wHQ$xO;vD'  
   } =au!rda  
  } 6Z' K1  
 } ?G!~&  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ?8?vBkz~  
} c0rU&+:Ry  
~:U`^wtQ  
BOOL InitHotkey() -Ah&|!/  
{ 2eeFaFif  
 if(hHook!=NULL){ x Gbq,~_r  
  nHookCount++; ^,t@HN;gA  
  return TRUE; GUqG1u z9  
 } Rg\4#9S JF  
 else nf<I  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); )8eb(!}7  
  if(hHook!=NULL) @Tq-3Um  
   nHookCount++; Lj#xZ!mQS  
  return (hHook!=NULL); qO8:|q1%;\  
} V/#J>-os}W  
BOOL UnInit() Iz j-,a  
{ e8wPEDN*4  
 if(nHookCount>1){ SdYb T)y  
  nHookCount--; bu<d>XR  
  return TRUE; oWLP|c~ Ap  
 } #gT"G18/!  
 BOOL unhooked = UnhookWindowsHookEx(hHook); NWPT89@l  
 if(unhooked==TRUE){ /{jt]8/;7  
  nHookCount=0; yzT1Zg_ER  
  hHook=NULL; 2kDv (".  
 } -K(d]-yv  
 return unhooked; Zlh 2qq  
} C& XPn;f  
_j3rs97@|  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) #Ha"rr46p  
{ Z!^>!' Z  
 BOOL bAdded=FALSE; s^IC]sW\%  
 for(int index=0;index<MAX_KEY;index++){ r\F2X J^  
  if(hCallWnd[index]==0){ T0"nzukd  
   hCallWnd[index]=hWnd; >3B {sn}  
   HotKey[index]=cKey; 7CSz  
   HotKeyMask[index]=cMask; :@"o.8p   
   bAdded=TRUE; @ <2y+_e  
   KeyCount++; rPyjr(I"_  
   break; iM;Btv[|  
  } GYiL}itD=3  
 } DTM(SN8R+n  
 return bAdded; Lk@+iHf  
} frW\!r{LT  
:A!EjIL`#  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Tp{ jR<  
{ 1#7|au%:)  
 BOOL bRemoved=FALSE; |4P8N{ L>O  
 for(int index=0;index<MAX_KEY;index++){ ZI qXkD  
  if(hCallWnd[index]==hWnd){ *{j;LA.BR#  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 67&Q<`V1*q  
    hCallWnd[index]=NULL; DNqV]N_W  
    HotKey[index]=0; 3D!7,@&>3  
    HotKeyMask[index]=0; $ta JVVF  
    bRemoved=TRUE; 4&%H;Q  
    KeyCount--; \}u/0UF97  
    break; (Cq 38~mR  
   } W2h4ej\s  
  } m9MY d  
 } l;A'^  
 return bRemoved; \v\ONp"  
} K@%T5M4j  
km5gO|V>m  
void VerifyWindow() #3LZX!  
{ +l/kH9m  
 for(int i=0;i<MAX_KEY;i++){ LVm']_K(f  
  if(hCallWnd!=NULL){ 9xq3>(  
   if(!IsWindow(hCallWnd)){ {jQLr7'  
    hCallWnd=NULL; qxAh8RR;/  
    HotKey=0; n7~4*B  
    HotKeyMask=0; 4|I;z  
    KeyCount--; Ja4M@z  
   } &v1E)/q{Z  
  } }`H{;A h  
 } "eOl(TSu/  
} ^E\n^D-RV  
}vOg9/[{  
BOOL CHookApp::InitInstance() -AD` (b7q  
{ !\d~9H%`B  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); zjcSn7iu  
 hins=AfxGetInstanceHandle(); f{O-\  
 InitHotkey(); `MCtm(<  
 return CWinApp::InitInstance(); 3fpaTue|x  
} ]+a~/  
9W\"A$;+&  
int CHookApp::ExitInstance() T+EwC)Ll  
{ 0<uLQVoR2n  
 VerifyWindow(); R[m{"2|,Lc  
 UnInit(); w6h83m 3  
 return CWinApp::ExitInstance(); qN' 3{jiPL  
} \),f?f-m  
u$zRm(!RB  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file tN4&#YK<  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) y4|<+9<7  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ^'tT_ gT  
#if _MSC_VER > 1000 ?SO!INJ  
#pragma once zh=0zJ  
#endif // _MSC_VER > 1000 @6+_0^  
V4}jv7>A  
class CCaptureDlg : public CDialog \n WbGS(  
{ 7BwR ].  
 // Construction [_3&  
 public: Zos.WS#  
  BOOL bTray; M=95E$6  
  BOOL bRegistered; O`%F{&;29  
  BOOL RegisterHotkey(); -bdWG]w"  
  UCHAR cKey; m;rr7{7X  
  UCHAR cMask; &nVekE:!  
  void DeleteIcon(); D4y!l~_,%M  
  void AddIcon(); +HWFoK  
  UINT nCount; FNOsw\Bo  
  void SaveBmp(); 5bXpj86mY  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor W)D?8*  
  // Dialog Data B<-("P(q  
  //{{AFX_DATA(CCaptureDlg) )eZ}Kt+  
  enum { IDD = IDD_CAPTURE_DIALOG }; _w %:PnO  
  CComboBox m_Key; }|) N5bGQe  
  BOOL m_bControl; 4ME$Z>eN  
  BOOL m_bAlt; fH_l2b[-3@  
  BOOL m_bShift; ;r6YIS4@  
  CString m_Path; ;~$Q;m 1  
  CString m_Number; "x$L 2>9  
  //}}AFX_DATA =L1%gQJJ&  
  // ClassWizard generated virtual function overrides )!E:  
  //{{AFX_VIRTUAL(CCaptureDlg) L;vglS=l;  
 public: cmU0=js.  
  virtual BOOL PreTranslateMessage(MSG* pMsg); >7cj. %  
 protected: qc)+T_m  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support tl*v(ZW  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); T|h!06   
  //}}AFX_VIRTUAL '-n Iy$>  
  // Implementation F !OD*]  
 protected: `^on`"\{u  
  HICON m_hIcon; :6)!#q'g  
  // Generated message map functions 5Rw2/J L  
  //{{AFX_MSG(CCaptureDlg) e:4,rfF1  
  virtual BOOL OnInitDialog(); hJ[keaO  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); }1V+8'D  
  afx_msg void OnPaint(); +/[Rvh5WZ  
  afx_msg HCURSOR OnQueryDragIcon(); vRW;{,d  
  virtual void OnCancel(); KVEc:<|x  
  afx_msg void OnAbout(); NYg&8s.  
  afx_msg void OnBrowse(); m8F \ESL  
  afx_msg void OnChange(); e]; IQ|  
 //}}AFX_MSG |E$q S)y  
 DECLARE_MESSAGE_MAP() >c Tt2v  
}; 3$K[(>s  
#endif [okV[7  
bf1$:09  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file '-I\G6w9  
#include "stdafx.h" tBZ?UAe;  
#include "Capture.h" lFIaC}  
#include "CaptureDlg.h" x5smJ__/  
#include <windowsx.h> lB/ ^  
#pragma comment(lib,"hook.lib") ;*FY+jM  
#ifdef _DEBUG |9$C%@8  
#define new DEBUG_NEW ('j'>"1H  
#undef THIS_FILE g[@0H=  
static char THIS_FILE[] = __FILE__; b5jD /X4  
#endif | a i#rU  
#define IDM_SHELL WM_USER+1 >QN-K]YLL  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); mRyf+O[  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); +jq@!P"}d  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; =^*EM<WG)  
class CAboutDlg : public CDialog l& sEdEA  
{ %z[=T@  
 public: 1B&XM^>/  
  CAboutDlg(); HpUJ_pZ  
  // Dialog Data o.|36#Fa  
  //{{AFX_DATA(CAboutDlg) o>d0R w4h  
  enum { IDD = IDD_ABOUTBOX }; ?/hS1yD;  
  //}}AFX_DATA x#5[i;-c  
  // ClassWizard generated virtual function overrides S{]3e-?  
  //{{AFX_VIRTUAL(CAboutDlg) H>]*<2(=-  
 protected: zp'hA  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ?;5/"/i  
  //}}AFX_VIRTUAL Nknd8>Hy+  
  // Implementation ;O,&MR{;|n  
 protected: =)i^E9  
  //{{AFX_MSG(CAboutDlg) |FlB#  
  //}}AFX_MSG RhF< {U.  
  DECLARE_MESSAGE_MAP() mKV31wvK}  
}; `O.pT{Lf  
.),9a,  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) F &5iA\  
{ j1+I_   
 //{{AFX_DATA_INIT(CAboutDlg) XS^du{ai  
 //}}AFX_DATA_INIT \7xc*v [  
} yEJ3O^(F  
(~F}O  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) "la0@/n  
{ :*|So5fs  
 CDialog::DoDataExchange(pDX); .Q@]+&`|}i  
 //{{AFX_DATA_MAP(CAboutDlg) F>[^m Xw  
 //}}AFX_DATA_MAP 9aIv|cS?  
} Xf{p>-+DL  
\ E5kpm  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ErsJWp  
 //{{AFX_MSG_MAP(CAboutDlg) 0lYP!\J3]%  
 // No message handlers |rhB@k  
 //}}AFX_MSG_MAP &n83>Q  
END_MESSAGE_MAP() RCK*?\m5  
Y}yh6r;i  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) .S=|ZP+  
: CDialog(CCaptureDlg::IDD, pParent) !rqs!-cCQ  
{ M 0G`P1o  
 //{{AFX_DATA_INIT(CCaptureDlg) 8/,s 8u  
  m_bControl = FALSE; } MP_  
  m_bAlt = FALSE; \fUVWXv  
  m_bShift = FALSE; B"*PBJuOA  
  m_Path = _T("c:\\"); ga;t`5+d  
  m_Number = _T("0 picture captured."); k!+v*+R+V  
  nCount=0; 7pep\  
  bRegistered=FALSE; }PDtx:T-  
  bTray=FALSE; 9nlj{(  
 //}}AFX_DATA_INIT G2c\"[N1/  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 L-q)48+^k  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); hA&m G33  
} %){/O}I]>  
tLdQO"  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) NP~3!b  
{ m<cv3dbZo  
 CDialog::DoDataExchange(pDX); Xfg?\j/  
 //{{AFX_DATA_MAP(CCaptureDlg) O0pXHXSAL  
  DDX_Control(pDX, IDC_KEY, m_Key); *8%uXkMm  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); iQCs 8hIR  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 7s:cg  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 2AxKB+c1`  
  DDX_Text(pDX, IDC_PATH, m_Path); YVz,P_\(m  
  DDX_Text(pDX, IDC_NUMBER, m_Number); SST@   
 //}}AFX_DATA_MAP B4m34)EOE  
} =PjdL3 2  
>%t5j?p  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) S!JLy&@  
//{{AFX_MSG_MAP(CCaptureDlg) +f_3JL$  
 ON_WM_SYSCOMMAND() V{qR/  
 ON_WM_PAINT() qCm%};yt  
 ON_WM_QUERYDRAGICON() $\20Vgu<  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 0PUSCka'6  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) U}<zn+SI#V  
 ON_BN_CLICKED(ID_CHANGE, OnChange) "zFTPL"  
//}}AFX_MSG_MAP nAj +HLO  
END_MESSAGE_MAP() y{tM|  
,|UwZ_.  
BOOL CCaptureDlg::OnInitDialog() &oK&vgcj  
{ $O\]cQD`u  
 CDialog::OnInitDialog(); 6"+bCx0:  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); O#vIn}  
 ASSERT(IDM_ABOUTBOX < 0xF000); `j.-hy>s  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 8D^ iQBA  
 if (pSysMenu != NULL) jgYe\dinM  
 { YB]^Y^"e  
  CString strAboutMenu; {qSYe!`  
  strAboutMenu.LoadString(IDS_ABOUTBOX);  {qH+S/  
  if (!strAboutMenu.IsEmpty()) A_J!VXq  
  { Nlm3RxSn  
   pSysMenu->AppendMenu(MF_SEPARATOR); }:b) =fs  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); i^}DIx{  
  } W[73q>'  
 } 7Uh/Gl  
 SetIcon(m_hIcon, TRUE); // Set big icon D;DI8.4`N  
 SetIcon(m_hIcon, FALSE); // Set small icon dFnu&u"  
 m_Key.SetCurSel(0); _C$SaQty[Q  
 RegisterHotkey(); 79'N/:.  
 CMenu* pMenu=GetSystemMenu(FALSE); dW|S\S'&  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 5 ^tetDz}  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); H|;BT  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 3J^'x  
 return TRUE; // return TRUE unless you set the focus to a control jrYA5>=>#  
} 0IbR>zFg.  
oi^pU  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) @CCDe`R*  
{ [;7$ 'lr%D  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Reg%ah|$/=  
 { R&L^+?  
  CAboutDlg dlgAbout; ,L(q/#p  
  dlgAbout.DoModal(); +C=^,B!,  
 } 1-pxM~Y  
 else tW3Nry  
 { o{K#LP  
  CDialog::OnSysCommand(nID, lParam); 1tCe#*|95  
 } nqib`U@"  
} ~_4$|WKl  
{'f=*vMI  
void CCaptureDlg::OnPaint() MrS~u  
{ l;;"v) C8  
 if (IsIconic()) r@H7J 5<Y-  
 { cbX  <  
  CPaintDC dc(this); // device context for painting KMV&c  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); j"P}Wn  
  // Center icon in client rectangle 4Mj cx.21  
  int cxIcon = GetSystemMetrics(SM_CXICON); g; ZVoD  
  int cyIcon = GetSystemMetrics(SM_CYICON); m<:g\_<  
  CRect rect; J|WkPv2  
  GetClientRect(&rect); }& e#b]&:*  
  int x = (rect.Width() - cxIcon + 1) / 2; (d=knoo7A  
  int y = (rect.Height() - cyIcon + 1) / 2; 1Qo2Z;h@  
  // Draw the icon R94 ID@LF  
  dc.DrawIcon(x, y, m_hIcon); C;eM:v0A[  
 } t|k-Bh:x  
 else 2?9gf,U  
 { Y:K1v:Knw  
  CDialog::OnPaint(); f}zv@6#&  
 } ,Je9]XT  
} Cn8w}) B  
(>gHfC>(lq  
HCURSOR CCaptureDlg::OnQueryDragIcon() 7E)*]7B%  
{ { daEKac5  
 return (HCURSOR) m_hIcon; <0^L L  
} ':?MFkYC  
=:7OS>x  
void CCaptureDlg::OnCancel() &^b mZj!  
{ An3%@;  
 if(bTray) 9]*hP](  
  DeleteIcon(); 7V7iIbi  
  CDialog::OnCancel(); J~1 =?</  
} FTZaN1%`  
oxgh;v*  
void CCaptureDlg::OnAbout() UhF+},gU  
{ =%G<S'2'  
 CAboutDlg dlg; )|i]"8I  
 dlg.DoModal(); H{fOAv1*  
} =jW= Z$3q  
ojy[<  
void CCaptureDlg::OnBrowse() $+Vp>  
{ pe7R1{2Q_s  
 CString str; DM)%=C6<  
 BROWSEINFO bi; 6 2#dSd}HG  
 char name[MAX_PATH]; BJI"DrF  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); @G>Q(a*,  
 bi.hwndOwner=GetSafeHwnd(); !TdbD56  
 bi.pszDisplayName=name; *mj3  T  
 bi.lpszTitle="Select folder"; N13wVx  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; v`KYhqTUl  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); e8ZMB$byP  
 if(idl==NULL) *u`[2xmuYf  
  return; n*GsM6Y&  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); j69 2M.A  
 str.ReleaseBuffer(); xr'gi(.o  
 m_Path=str; j5qrM_Chg  
 if(str.GetAt(str.GetLength()-1)!='\\') S2EeC&-AR  
  m_Path+="\\"; ojQjx|Q}  
 UpdateData(FALSE); >`!Lh`n7_  
} *1cl PK  
mk&`dr  
void CCaptureDlg::SaveBmp() 8 ,<F102(  
{ ;Jq 7E  
 CDC dc; c2fbqM~  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); %Ut7%obpi  
 CBitmap bm; Y)]x1I  
 int Width=GetSystemMetrics(SM_CXSCREEN); 6 P6Pl&  
 int Height=GetSystemMetrics(SM_CYSCREEN); *#2]`G)  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ;/]v mgl2  
 CDC tdc; WT9 k85hqj  
 tdc.CreateCompatibleDC(&dc); )=c/{  
 CBitmap*pOld=tdc.SelectObject(&bm); xxC2F:Q?U  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 9Jhc5G  
 tdc.SelectObject(pOld); ('7qJkV  
 BITMAP btm; 2wki21oY  
 bm.GetBitmap(&btm); )kiC/Y}k  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; [#Y7iN&  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ^u[n!R\  
 BITMAPINFOHEADER bih; PQFr4EY?i  
 bih.biBitCount=btm.bmBitsPixel; DU>#eR0G  
 bih.biClrImportant=0; iw ==q:$  
 bih.biClrUsed=0; op]HF4  
 bih.biCompression=0; 7`IoQvX  
 bih.biHeight=btm.bmHeight; JVgV,4 1  
 bih.biPlanes=1; BYBf`F)4  
 bih.biSize=sizeof(BITMAPINFOHEADER); Q-M"+HO  
 bih.biSizeImage=size; +:&,Ts/  
 bih.biWidth=btm.bmWidth; W8R"X~!V  
 bih.biXPelsPerMeter=0; _R?:?{r,  
 bih.biYPelsPerMeter=0; ic_q<Y}  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Y^~Dr|5%  
 static int filecount=0; )k}UjU`!  
 CString name; ggn:DE "  
 name.Format("pict%04d.bmp",filecount++); C VyE5w  
 name=m_Path+name; ySk'#\d  
 BITMAPFILEHEADER bfh; xmI!N0eta  
 bfh.bfReserved1=bfh.bfReserved2=0; Ckc4U. t|  
 bfh.bfType=((WORD)('M'<< 8)|'B'); AvS<b3EoN  
 bfh.bfSize=54+size; k&h3"  
 bfh.bfOffBits=54; Y={_o!9  
 CFile bf; `"* ]C  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ lQSKY}h  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); )LP=IT  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 93aRWEu3  
  bf.WriteHuge(lpData,size); `/0S]?a.{B  
  bf.Close();  ;Iu}Q-b*  
  nCount++; ,J3s1 ]~^  
 } Rt^~db  
 GlobalFreePtr(lpData); @1UC9}>  
 if(nCount==1) ~Kr_[X:d5  
  m_Number.Format("%d picture captured.",nCount); Nhnw'9  
 else );zLy?n  
  m_Number.Format("%d pictures captured.",nCount); hkhk,bhI  
  UpdateData(FALSE); wNX2*   
} O-D${==  
YA vOV-L  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) gLyE,1Z}u  
{ 18xT2f  
 if(pMsg -> message == WM_KEYDOWN) dO{a!Ca  
 { quPNwNy  
  if(pMsg -> wParam == VK_ESCAPE) GYq.!d@O  
   return TRUE; +hJ@w-u,G  
  if(pMsg -> wParam == VK_RETURN) MvLmEmKb}\  
   return TRUE; 6pHn%yE*  
 } nYc8+5CcK'  
 return CDialog::PreTranslateMessage(pMsg); g]hTz)8fF  
} Xj^Hy"HC^~  
'8$*gIQ8  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) E~y@ue:  
{ 1D6F WYV8  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ *)6:yn  
  SaveBmp(); b;X|[tB  
  return FALSE; o'8`>rb  
} TNHkHR[&  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ iksd^\]f  
 CMenu pop; CQ`$' oy?W  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); X{j`H\'L  
 CMenu*pMenu=pop.GetSubMenu(0); t%`GXJb  
 pMenu->SetDefaultItem(ID_EXITICON); l^B PTg)X@  
 CPoint pt; sfv{z!mo  
 GetCursorPos(&pt); <ETR6r  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); d0Jaa1b~O  
 if(id==ID_EXITICON) SGuLL+|W#8  
  DeleteIcon(); *C (/ 2  
 else if(id==ID_EXIT) cM= ? {W7~  
  OnCancel(); |NsrO8H   
 return FALSE; aOj(=s  
} 9F&s9(=\  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); c%N8|!e  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) P}AfXgr  
 AddIcon(); HX(Z(rcI  
 return res; m|}};8  
} <u 'q._m  
_h=kjc}[.O  
void CCaptureDlg::AddIcon() M+mO4q6  
{ d'4^c,d  
 NOTIFYICONDATA data; eiNF?](3O  
 data.cbSize=sizeof(NOTIFYICONDATA); _wC4n }J  
 CString tip; H1alf_(_ \  
 tip.LoadString(IDS_ICONTIP); h]6"~ m  
 data.hIcon=GetIcon(0); -jv%BJJlX  
 data.hWnd=GetSafeHwnd(); +EtL+Y (U  
 strcpy(data.szTip,tip); 0gs0[@  
 data.uCallbackMessage=IDM_SHELL; Q/y^ff]=  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; v7i5R !  
 data.uID=98; B-@ ]+W  
 Shell_NotifyIcon(NIM_ADD,&data); &K1\"  
 ShowWindow(SW_HIDE); o:E_k#Fi  
 bTray=TRUE; k|Hxd^^I  
} w _*|u  
-t<8)9q(  
void CCaptureDlg::DeleteIcon() O[tOpf@s.  
{ ]Tb ?k+a  
 NOTIFYICONDATA data; Vh.9/$xQ  
 data.cbSize=sizeof(NOTIFYICONDATA); ^X&n-ui   
 data.hWnd=GetSafeHwnd(); 7(q EHZEr  
 data.uID=98; WxN@&g(  
 Shell_NotifyIcon(NIM_DELETE,&data); rW~hFSrV[o  
 ShowWindow(SW_SHOW); eC9nOwp]xH  
 SetForegroundWindow(); h;^H*Y&`  
 ShowWindow(SW_SHOWNORMAL); 2W}f|\8MX  
 bTray=FALSE; 3M;[.b  
} FXHcy:)}G  
{Q&@vbw'  
void CCaptureDlg::OnChange() ,r&:C48 dI  
{ Eagl7'x  
 RegisterHotkey(); >O{[w'sWa  
} 7lo`)3mB  
k3-'!dW<  
BOOL CCaptureDlg::RegisterHotkey() ;oKN8vI#7  
{ :f~[tox  
 UpdateData(); Ac0^`  
 UCHAR mask=0; 9rB,7%@EL  
 UCHAR key=0; AjTkQ)  
 if(m_bControl) 44uM:;  
  mask|=4; #hA]r.  
 if(m_bAlt) AE_7sM  
  mask|=2; [r,ZM  
 if(m_bShift) wTpjM@F?J|  
  mask|=1; * 5H  
  key=Key_Table[m_Key.GetCurSel()]; 7+,6 m!4  
 if(bRegistered){ (-RZ|VdYg  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); y5td o'Ex  
  bRegistered=FALSE; sd@JQ%O  
 } ^`W8>czi  
 cMask=mask; 5$v,%~$Xds  
 cKey=key; '^T Q Ubw  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); peA}/Jc  
 return bRegistered; E@/yg(?d=  
} =~OH.=9\  
NA%(ZRSg(  
  四、小结 Z*Sa%yf  
c k$ > yk  
  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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