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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: `y#UJYXQE  
  1+?^0%AC  
  一、实现方法 s3Cc;#  
h6dPO"  
  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: Vh>Z,()>>@  
p~LrPWHSTP  
#pragma data_seg("shareddata") n~VD uKn9  
HHOOK hHook =NULL; //钩子句柄 <nEi<iAY>U  
UINT nHookCount =0; //挂接的程序数目 G "P4-  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 s+tGFjq  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 OtFh,}E  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey zbJT&@z  
static int KeyCount =0; &/,|+U[  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 \9-"M;R.d  
#pragma data_seg() !!Z?[rj  
dz Zb  
  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。 `~eUee3b.~  
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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: 6'xsG?{JY  
N&@}/wzZ  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR gv5*!eI  
cKey,UCHAR cMask) U*.0XNKp{  
{  }-~l!  
 BOOL bAdded=FALSE; J90v!p-  
 for(int index=0;index<MAX_KEY;index++){ YJ$1N!rG  
  if(hCallWnd[index]==0){ m,fAeln  
   hCallWnd[index]=hWnd; LdJYE;k Ju  
   HotKey[index]=cKey; ! VjFW5'{  
   HotKeyMask[index]=cMask; S*yjee<@  
   bAdded=TRUE; BT}&Y6  
   KeyCount++; eYx Kp!f  
   break; tBpC: SG  
  } EqI(|bFwy  
 } =-p$jXVW%  
 return bAdded; I}R0q  
} P;4w*((} ~  
//删除热键 w&ak"GgV  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) w3$   
{ b+Br=Fv"T  
 BOOL bRemoved=FALSE; ut r:J  
 for(int index=0;index<MAX_KEY;index++){ Y))NK'B5  
  if(hCallWnd[index]==hWnd){ ^j7azn  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ *2jK#9"MP  
    hCallWnd[index]=NULL; r&FDEBh  
    HotKey[index]=0; Yw0[[N<SW  
    HotKeyMask[index]=0; bJs9X/E  
    bRemoved=TRUE; @B}aN@!/  
    KeyCount--; 4[N^>qt =  
    break; 43=,yz2Ef  
   } ,a#EW+" Z  
  } )p*}e8L  
 } 2WG>, 4W2  
 return bRemoved; Nz)l<S9>  
} u{L!n$D7  
<_Q1k>  
kBN+4Dr/$  
  DLL中的钩子函数如下: }V\N16f  
m^qBx A  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) H= X|h)  
{ zP<pEI  
 BOOL bProcessed=FALSE; <I;2{*QI2  
 if(HC_ACTION==nCode) ZRYEqSm  
 { !F?XLekTi  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 }\C-} Q  
   switch(wParam) &\_iOw8  
   {  9?k_y ZV  
    case VK_MENU: uG<}N=  
     MaskBits&=~ALTBIT; MHa#?Q9  
     break; =G]@+e  
    case VK_CONTROL: Dih3}X&jn$  
     MaskBits&=~CTRLBIT; {AQ=<RDRF  
     break; #Qkroji qw  
    case VK_SHIFT: c/ uNM  
     MaskBits&=~SHIFTBIT; x#:| }pR  
     break; "^Ybs'-  
    default: //judge the key and send message xMBaVlEN  
     break; - |gmQG  
   } 7VP32Eh[  
   for(int index=0;index<MAX_KEY;index++){ !kC* g  
    if(hCallWnd[index]==NULL) 9YBv|A  
     continue; fDP$ sW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) nl9P, d  
    { ,UuH}E  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); &ot/nQQ  
     bProcessed=TRUE; t]e;;q=L.  
    } N\bocMc,X  
   } h\'n**f_x  
  } %'T #pz  
  else if((lParam&0xc000ffff)==1){ //有键按下 =)7s$ p  
   switch(wParam) LcE+GC  
   { ."Y e\>k  
    case VK_MENU: 0P]E6hWgg  
     MaskBits|=ALTBIT; Z:_D0jG  
     break; BGfzslK  
    case VK_CONTROL: y8DhOlewQ  
     MaskBits|=CTRLBIT; ZIF49`Y4TF  
     break; 12+>5BA  
    case VK_SHIFT: <'g:T(t  
     MaskBits|=SHIFTBIT; ? C/Te)  
     break; JwXT%op9RP  
    default: //judge the key and send message QMZ)-ty"  
     break; v~Y^r2  
   } +[tP_%/r'^  
   for(int index=0;index<MAX_KEY;index++){ }m-FGk  
    if(hCallWnd[index]==NULL) ^7Fh{q4IE  
     continue; 5+wAzVA  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |ely|U. Tf  
    { Cn[0(s6  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 7>~5jYP  
     bProcessed=TRUE; of@#:Qs  
    } jkvgoxY  
   } tzh1s i  
  } 2rZx Sg  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ,tg0L$qC  
   for(int index=0;index<MAX_KEY;index++){ {+@bZ}57  
    if(hCallWnd[index]==NULL) 9rA=pH%<>B  
     continue; L/z),#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) +U3m#Y)k  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); .e3+s*  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 S1?-I_t+]  
   } 2J;kSh1,L  
  } )sT> i  
 } J.| +ID+  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); @|tL8?  
} jt.3P  
PV=5UyjW  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: Gmz6$^D   
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BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 5;{H&O9Q  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); mtj h`  
FeTL&$O  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: piZJJYv t  
D~\$~&_]=  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) c[ ]4n  
{ QMpoa5ZQG  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 'Un " rts  
 { )[|3ZP`  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 s4uhsJL V$  
  SaveBmp(); k{Aj^O3gD  
  return FALSE; UMcgdJB  
 } z.I9wQ]X[  
 …… //其它处理及默认处理 /n8B,-Z5s5  
} '3 ^+{=q  
:]1 TGfS  
r#B+(X7LM  
  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。 "^]cQ"A  
r#Oo nZ  
  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。 _Wa. JUbv  
(/j); oSK  
  二、编程步骤 W!&vul5  
qC?:*CXH  
  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"; b 'pOJS  
J>bJ 449B  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; UCClWr  
Z LD}a:s  
  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; >:|q&|x-  
<|Pun8j  
  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; ez6EjUk  
r'*}TM'8  
  5、 添加代码,编译运行程序。 : 7`[$<~E  
h|"9LU4a  
三、程序代码 Bb"Bg\le,^  
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///////////////////////////////////// Hook.h : main header file for the HOOK DLL G-.^O,%  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) A, LuD.8  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ i?F >+  
#if _MSC_VER > 1000 _\GC(  
#pragma once =Fr(9 (  
#endif // _MSC_VER > 1000 )6J9J+%bi  
#ifndef __AFXWIN_H__ 6ZQwBS0Y  
#error include 'stdafx.h' before including this file for PCH Q(oN/y3,  
#endif 7[}xP#Z  
#include "resource.h" // main symbols KPj\-g'A  
class CHookApp : public CWinApp =HlQ36;*  
{ X]dwX%:Z!j  
 public: !f+H,]D"  
  CHookApp(); 9amaL~m  
  // Overrides C-H@8p?T  
  // ClassWizard generated virtual function overrides `u&Zrdr,  
  //{{AFX_VIRTUAL(CHookApp) gjAIEI  
 public: "PpN0Rr  
  virtual BOOL InitInstance(); CLJ;<  
  virtual int ExitInstance(); Q{lpKe0  
  //}}AFX_VIRTUAL 6gs01c,BA  
  //{{AFX_MSG(CHookApp) :d#VE-e  
  // NOTE - the ClassWizard will add and remove member functions here. fu]s/'8B  
  // DO NOT EDIT what you see in these blocks of generated code ! 0ok-IHE<  
  //}}AFX_MSG O6G0  
  DECLARE_MESSAGE_MAP() :FTMmW,>'  
}; +lMX{es\O  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ptZ <ow&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); @0u~?!g@  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); E }nH1  
BOOL InitHotkey(); d*%`!G  
BOOL UnInit(); PU1Qsb5  
#endif o_^?n[4  
,~]tg77  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. *5^Q7``  
#include "stdafx.h" aN8|J?JH  
#include "hook.h" S_IUV)  
#include <windowsx.h> = < oBgD0k  
#ifdef _DEBUG 8Hn|cf0  
#define new DEBUG_NEW +yD`3` E  
#undef THIS_FILE $NZ-{dY{  
static char THIS_FILE[] = __FILE__; Qh'ATo  
#endif @8pp EFw  
#define MAX_KEY 100 .w8J*JZ  
#define CTRLBIT 0x04 =t H:,SH  
#define ALTBIT 0x02 GfmI<{da  
#define SHIFTBIT 0x01 Z*= $8 e@  
#pragma data_seg("shareddata") }%_ b$  
HHOOK hHook =NULL; NP/Gn6fr  
UINT nHookCount =0; yU-e3O7L  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey P n>Xbe  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT sEGO2xeI  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey l^pA2yh|  
static int KeyCount =0; &p4&[H?  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 7KAO+\)H^Y  
#pragma data_seg() + |#O@k  
HINSTANCE hins; *&^:T~|=!  
void VerifyWindow(); w.YiO5|y  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) |m^k_d!d  
//{{AFX_MSG_MAP(CHookApp) G2Qlt@.T  
// NOTE - the ClassWizard will add and remove mapping macros here. |n,<1QY  
// DO NOT EDIT what you see in these blocks of generated code! iA'lon  
//}}AFX_MSG_MAP y+c|vdW%  
END_MESSAGE_MAP() {_ i\f ]L  
K k-S}.E  
CHookApp::CHookApp() G <i@ 5\#  
{ iiS-9>]/  
 // TODO: add construction code here, ]);%wy{Ho  
 // Place all significant initialization in InitInstance Hn%xDJ'  
} (2^gVz=j  
2[O&NdP\Zk  
CHookApp theApp; /2=#t-p+  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) GycSwQ ,  
{ 0+kH:dP{  
 BOOL bProcessed=FALSE; I uMQ9 &  
 if(HC_ACTION==nCode) Tk:h@F|B.|  
 { `\#B18eU  
  if((lParam&0xc0000000)==0xc0000000){// Key up `OXpU,Z 6U  
   switch(wParam) B1>/5hV}  
   { 8TLgNQP  
    case VK_MENU: z6jc8Z=O  
     MaskBits&=~ALTBIT; (nlvl?\d  
     break; hog=ut  
    case VK_CONTROL: Of[XKFn_  
     MaskBits&=~CTRLBIT; _lGdUt 2  
     break; iB%gPoDCL@  
    case VK_SHIFT: w~"KA6^  
     MaskBits&=~SHIFTBIT; Kgi<UkFP  
     break; X[&Wkr8x '  
    default: //judge the key and send message ymx>i~>7J  
     break; ,^w?6?,&l}  
   } iw8yb;|z;A  
   for(int index=0;index<MAX_KEY;index++){ _/6!yyl  
    if(hCallWnd[index]==NULL) zxbpEJzpn  
     continue; MHX?@. v  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) i]6`LqlO  
    { ->g*</  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); '%dfz K*Z  
     bProcessed=TRUE; g1W.mAA3B  
    } #><.oreXq  
   } V-Sd[  
  } LYz.Ci}  
  else if((lParam&0xc000ffff)==1){ //Key down vdx0i&RiL  
   switch(wParam) g!?:Ye`5  
   { \eT5flC  
    case VK_MENU: bzuEfFaL  
     MaskBits|=ALTBIT; ]|zp0d=&o  
     break; QxVq^H  
    case VK_CONTROL: G MX?  
     MaskBits|=CTRLBIT; &eCa0s?mI  
     break; )4<__|52"1  
    case VK_SHIFT: W&& ;:Fr  
     MaskBits|=SHIFTBIT; $Q96,rb}k;  
     break; HkUWehVm  
    default: //judge the key and send message c#Sa]n  
     break; q_g+Jf P-D  
   } )4gJd? 8R  
   for(int index=0;index<MAX_KEY;index++) +;N2p1ZBf  
   { VEqS;~[  
    if(hCallWnd[index]==NULL) }L+L"l&  
     continue; %,6#2X nX%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Sa?ksD2IaB  
    { g*e   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); #LL?IRH9^  
     bProcessed=TRUE; _aad=BrMK  
    } k.vBj~xU  
   } 7VqM$I  
  } /%}*Xh  
  if(!bProcessed){ u09:Z{tL;@  
   for(int index=0;index<MAX_KEY;index++){ Q<^Tl(`/N?  
    if(hCallWnd[index]==NULL) nrxo &9[@n  
     continue; `\gnl'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Ma.`A  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); [E!oQVY  
   } aE&,]'6  
  } \?0&0;5  
 } Tx|Ir+f6L  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 9`I _Et  
} +*ZO&yJQ^<  
6y+Kjd/D  
BOOL InitHotkey() a(kg/s  
{ @SJL\{_  
 if(hHook!=NULL){ tiB_a}5IB  
  nHookCount++; )}D'<^=#T  
  return TRUE; _aFl_\3>  
 } rz wF~-m +  
 else D coX+8 7  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); hxVKV?Fl  
  if(hHook!=NULL) s%C)t6`9  
   nHookCount++; \O*-#}~\  
  return (hHook!=NULL); TcjEcMw,  
} Hfw q/Is  
BOOL UnInit() ^)(bM$(`  
{ ~P8tUhffK  
 if(nHookCount>1){ bJRN;g  
  nHookCount--; 66/3|83Z  
  return TRUE; 8+a4>8[M  
 } s \;"X  
 BOOL unhooked = UnhookWindowsHookEx(hHook); E^ P,*s  
 if(unhooked==TRUE){ q|o}+Vr  
  nHookCount=0; xO^:_8=&:  
  hHook=NULL; =vQcYa  
 } HJXT9;w  
 return unhooked; !%^^\,  
} z=rT%lz6  
# {w9s 0:  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) P `}zlml  
{ %QH)'GJQ  
 BOOL bAdded=FALSE; -fwoTGlX  
 for(int index=0;index<MAX_KEY;index++){  `x l   
  if(hCallWnd[index]==0){ @R/07&lBR  
   hCallWnd[index]=hWnd; {sihus#Q  
   HotKey[index]=cKey; ?t/~lv  
   HotKeyMask[index]=cMask;  tBq nf v  
   bAdded=TRUE; p7veQ`yNc  
   KeyCount++; (]0%}$Fo  
   break; uw [<5  
  } *5vV6][  
 } M=1nQF2J  
 return bAdded; 4 Y ;Nm1 @  
} Mn9dqq~a  
"uuVy$6C  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) so"$m  
{ Izhee%c  
 BOOL bRemoved=FALSE; _,xc[ 07  
 for(int index=0;index<MAX_KEY;index++){ g!$!F>[  
  if(hCallWnd[index]==hWnd){ YP.5fq:  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ r"``QmM  
    hCallWnd[index]=NULL; %X4xv_o`f  
    HotKey[index]=0; tk!t Y8j  
    HotKeyMask[index]=0; TD'L'm|2  
    bRemoved=TRUE; aGJC1x  
    KeyCount--; lG4H:[5V  
    break; tw^,G(  
   } U}6.h&$  
  } OTGofd2zf  
 } QW $G  
 return bRemoved; @y='^DQ*  
} 9:ze{ c $  
+W:= e,=  
void VerifyWindow() fBRo_CU8!  
{ mz @T  
 for(int i=0;i<MAX_KEY;i++){ MaRi+3F  
  if(hCallWnd!=NULL){ zo+nq%=  
   if(!IsWindow(hCallWnd)){ ~%^ tB  
    hCallWnd=NULL; bu:S:`  
    HotKey=0; rqdE6y+^  
    HotKeyMask=0; kSR\RuY*  
    KeyCount--; 8Eakif0CO  
   } ;pqg/>W'  
  } 12;8o<~  
 } 2_n7=&  
} lz YEx  
o_@4Sl8  
BOOL CHookApp::InitInstance() n#q<`}u,  
{ Cnbz=z  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); :bz}c48%  
 hins=AfxGetInstanceHandle(); [z9 `)VIe  
 InitHotkey(); "}pNe"ok  
 return CWinApp::InitInstance(); |$Xl/)Oq  
} y.WEj?EL  
CjlKMbnBH  
int CHookApp::ExitInstance() jDy-)2<  
{ t?}zdI(4  
 VerifyWindow(); Min ^>  
 UnInit(); ebT:/wu,2  
 return CWinApp::ExitInstance(); =x<ge_Y  
} |K.mP4CKY  
Qa.<K{m#?  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file EQf[,  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) (iL|Sq&}b  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ f !s=(H;  
#if _MSC_VER > 1000 ny`#%Vs  
#pragma once i'9vL:3  
#endif // _MSC_VER > 1000 ~~v3p>zRr  
?Lyxw]  
class CCaptureDlg : public CDialog :?/cPg'D  
{ 8-BflejX  
 // Construction gW-V=LV (  
 public: ft$RSb#  
  BOOL bTray; a"FCZ.O1  
  BOOL bRegistered; BReJ!|{m}  
  BOOL RegisterHotkey(); =&,]Z6{ >  
  UCHAR cKey; +pR[U4$  
  UCHAR cMask; kuol rfGB  
  void DeleteIcon(); ;?8_G%va  
  void AddIcon(); J@4Bf  
  UINT nCount; xYmxc9)2  
  void SaveBmp(); ,=Mt`aN  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor |QU <e  
  // Dialog Data } \XfH  
  //{{AFX_DATA(CCaptureDlg) `}mcEl  
  enum { IDD = IDD_CAPTURE_DIALOG }; K Pt5=a  
  CComboBox m_Key; NMa} <  
  BOOL m_bControl; p(~Yx3$*  
  BOOL m_bAlt; i(iXD  
  BOOL m_bShift; ~nrK>%  
  CString m_Path; w+yC)Rmz  
  CString m_Number; BsEF'h'Owh  
  //}}AFX_DATA s (zL   
  // ClassWizard generated virtual function overrides *QLI3B9V  
  //{{AFX_VIRTUAL(CCaptureDlg) #7MUJY+ 9  
 public: KTP8?Q"n0  
  virtual BOOL PreTranslateMessage(MSG* pMsg); "J4WzA%i  
 protected: Ed_N[ I   
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support hnDBFQ{  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); [/Rf\T(,jn  
  //}}AFX_VIRTUAL -F<Wd/Xse  
  // Implementation ](&{:>RNJ  
 protected: NdzSz]q}  
  HICON m_hIcon; ;`^WGS(3.%  
  // Generated message map functions ;~D)~=|ZZ  
  //{{AFX_MSG(CCaptureDlg) ly:q6i  
  virtual BOOL OnInitDialog(); n2oz"<?$S  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); K2J \awX  
  afx_msg void OnPaint(); zxC#0@qX07  
  afx_msg HCURSOR OnQueryDragIcon(); E;+O($bA  
  virtual void OnCancel(); LN@F+CyDc  
  afx_msg void OnAbout(); jV4\A  
  afx_msg void OnBrowse();  \4v]7SV  
  afx_msg void OnChange(); yt.F\[1  
 //}}AFX_MSG y~F,0"N\r  
 DECLARE_MESSAGE_MAP() *XT/KxLa7  
}; FQqI<6;  
#endif D^=J|7e  
Pmh8sw  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file wS%Q<uK  
#include "stdafx.h" eA#;AQm  
#include "Capture.h" ;4.!H,d  
#include "CaptureDlg.h" 4A_[PM  
#include <windowsx.h> A1.7 O  
#pragma comment(lib,"hook.lib") zmSUw}-4 N  
#ifdef _DEBUG b/C`J p  
#define new DEBUG_NEW ><gG8MH0'  
#undef THIS_FILE pKit~A,Q  
static char THIS_FILE[] = __FILE__; bT^I"  
#endif Jo@|"cE=  
#define IDM_SHELL WM_USER+1 @te!Jgu{  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); r\/9X}y4z  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); UFp,a0|  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; oxz OA  
class CAboutDlg : public CDialog A'jP7 P  
{ P] UJ0b  
 public: "4uS3h2r  
  CAboutDlg(); C/TF-g-_Y  
  // Dialog Data e> (<eu~P  
  //{{AFX_DATA(CAboutDlg) TWQG591  
  enum { IDD = IDD_ABOUTBOX }; IW@PF7  
  //}}AFX_DATA L IZRoG8  
  // ClassWizard generated virtual function overrides ha(Z<  
  //{{AFX_VIRTUAL(CAboutDlg) .y@oz7T5  
 protected: YKO){f5  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ;#oie< Vit  
  //}}AFX_VIRTUAL `Ye\p6v!+  
  // Implementation <8d^^0  
 protected: <N_+=_  
  //{{AFX_MSG(CAboutDlg) IE9 XU9Kd  
  //}}AFX_MSG W9D86]3Y  
  DECLARE_MESSAGE_MAP() il:$sd  
}; E )5E$  
=jX8.K4]  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 1:f9J  
{ L1Iz<>  
 //{{AFX_DATA_INIT(CAboutDlg) }>VG~u8  
 //}}AFX_DATA_INIT ,PWgH$+  
} v" OY 1<8  
u%$Zqee  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) gG-BVl"59  
{ 1@QZnF5[  
 CDialog::DoDataExchange(pDX); /+\uqF8F  
 //{{AFX_DATA_MAP(CAboutDlg) dt`{!lts'  
 //}}AFX_DATA_MAP V&Xe!S  
} pXJpK@z  
n#wI@W >%+  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) .zn;:M#T  
 //{{AFX_MSG_MAP(CAboutDlg) Db;G@#x  
 // No message handlers YRh  B RE  
 //}}AFX_MSG_MAP Y6Lf@}2(i  
END_MESSAGE_MAP() ]8 f ms(  
+(C6#R<LI  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 1Dv R[Lx%  
: CDialog(CCaptureDlg::IDD, pParent) p' +  
{ ds?v'|  
 //{{AFX_DATA_INIT(CCaptureDlg) lJE93rXU  
  m_bControl = FALSE; 59O?_F9  
  m_bAlt = FALSE; Bc6|n :;u  
  m_bShift = FALSE; +;#Y]xy:  
  m_Path = _T("c:\\"); O'W0q;rT  
  m_Number = _T("0 picture captured."); { Fawt:  
  nCount=0; ,)iKH]lY=  
  bRegistered=FALSE; $aN&nhoO<  
  bTray=FALSE; 21< j\ M  
 //}}AFX_DATA_INIT U`Wauv&  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 &<UMBAS  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); jz5qQt]^  
} sIK;x]Q)  
TJ1+g \  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) M $Es%  
{ .8P.)%  
 CDialog::DoDataExchange(pDX); JvT"bZk( o  
 //{{AFX_DATA_MAP(CCaptureDlg) "87ghj_}  
  DDX_Control(pDX, IDC_KEY, m_Key); 2U; t(,dn'  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); m<0&~rg   
  DDX_Check(pDX, IDC_ALT, m_bAlt); WV#%PJ  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); v7DE  
  DDX_Text(pDX, IDC_PATH, m_Path); _ B 5gR  
  DDX_Text(pDX, IDC_NUMBER, m_Number); OujCb^Rm  
 //}}AFX_DATA_MAP 'rr^2d]`ST  
} il \$@Bn  
p~9vP)74u  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) OnK~3j  
//{{AFX_MSG_MAP(CCaptureDlg) D;_ MPN[  
 ON_WM_SYSCOMMAND() G=A,9@+c  
 ON_WM_PAINT() T`Mf]s)*  
 ON_WM_QUERYDRAGICON() -mRA#  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ,;(PwJe  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) pGK;1gVj  
 ON_BN_CLICKED(ID_CHANGE, OnChange) .]sf0S!  
//}}AFX_MSG_MAP rwG CUo6Z  
END_MESSAGE_MAP() 86\S?=J-b  
U)o$WH.b  
BOOL CCaptureDlg::OnInitDialog() }C#;fp"L  
{ opJMS6%r  
 CDialog::OnInitDialog(); bIEhgiH  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); !X<~-G2)l  
 ASSERT(IDM_ABOUTBOX < 0xF000); mGGsB5#w>  
 CMenu* pSysMenu = GetSystemMenu(FALSE); T9u<p=p  
 if (pSysMenu != NULL) ea~:}!-P  
 { OBP1B@|l$+  
  CString strAboutMenu; 2c:#O%d(  
  strAboutMenu.LoadString(IDS_ABOUTBOX); =<NljOR4`  
  if (!strAboutMenu.IsEmpty()) ijdXU8  
  { <F.Tx$s  
   pSysMenu->AppendMenu(MF_SEPARATOR); JGH60|  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); DNj "SF(J  
  } WN_pd%m  
 } TW9WMId  
 SetIcon(m_hIcon, TRUE); // Set big icon h<SQL97N  
 SetIcon(m_hIcon, FALSE); // Set small icon Ko/ I#)  
 m_Key.SetCurSel(0); ]s GHG^I6  
 RegisterHotkey(); K%X^n>O7C  
 CMenu* pMenu=GetSystemMenu(FALSE); D*YM[sN`  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 8kIR y   
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); YI.w-K\  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); i7utKj*57  
 return TRUE; // return TRUE unless you set the focus to a control bLd#xXl  
} X0M1(BJgGo  
SJ};TEA  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) C,pJ`:P  
{ '^FGc  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) lME)?LOI  
 { /M*a,o  
  CAboutDlg dlgAbout; zdEPDd B  
  dlgAbout.DoModal(); }LijnHH.  
 } " $ew~;z  
 else Iz{R}#8CZ  
 { sPb=82~z  
  CDialog::OnSysCommand(nID, lParam); `QUy;%+  
 } ?w+Ix~k  
} ,57`D'  
!DI{:I_h(  
void CCaptureDlg::OnPaint() z ly unJD(  
{ \a=D  
 if (IsIconic()) DVkB$2]  
 { v^_mFp-}\  
  CPaintDC dc(this); // device context for painting {|yob4N  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); fz3 lV  
  // Center icon in client rectangle ~35U]s@v  
  int cxIcon = GetSystemMetrics(SM_CXICON); Y"6w,_'m  
  int cyIcon = GetSystemMetrics(SM_CYICON); RNhJ'&SYs  
  CRect rect; n9\]S7] 52  
  GetClientRect(&rect); ]wWPXx[>/  
  int x = (rect.Width() - cxIcon + 1) / 2; WwUv5GZTW  
  int y = (rect.Height() - cyIcon + 1) / 2; LT,?$I  
  // Draw the icon .]9c/  
  dc.DrawIcon(x, y, m_hIcon); Eb=#9f%y>&  
 } vQa'S-@u  
 else <6G1 1-K  
 { a+9 *@z2  
  CDialog::OnPaint(); AT\qiznvP  
 } xGG,2W+z  
} 6O22P?v  
\J6hI\/4^  
HCURSOR CCaptureDlg::OnQueryDragIcon() &V<W>Y>|l*  
{ 7oR:1DX w|  
 return (HCURSOR) m_hIcon; ) 9oH,gZ  
} )#}mH@  
KPpHwcYxT  
void CCaptureDlg::OnCancel() DtEwW1J  
{ $L2%u8}8:  
 if(bTray) nxJee=qH  
  DeleteIcon(); o8Z[+;  
  CDialog::OnCancel(); B=@ jWz"  
} bLnrbid  
;kJu$U  
void CCaptureDlg::OnAbout() 2Gs$?}"a  
{ hG_?8:W8HT  
 CAboutDlg dlg; hHPs&EA.p  
 dlg.DoModal(); q,3;m[cA  
} xwH?0/  
$7'g Rb4  
void CCaptureDlg::OnBrowse() {q3H5csFq  
{ wM _ 6{  
 CString str; gXH[$guf  
 BROWSEINFO bi; kGUJ9Du  
 char name[MAX_PATH]; vw)7 !/#  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); u?[ q=0.J7  
 bi.hwndOwner=GetSafeHwnd(); 3F#+~^2  
 bi.pszDisplayName=name; Z^9/v  
 bi.lpszTitle="Select folder"; er.CDKD%L  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; :vL1}H<  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 1H,g=Y4f%  
 if(idl==NULL) 7 ua6l[c  
  return; 8v)_6p(<x8  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); EOoZoVdzx  
 str.ReleaseBuffer(); O`$#Pg  
 m_Path=str; zj|/ CxV  
 if(str.GetAt(str.GetLength()-1)!='\\') 3<?XTv-  
  m_Path+="\\"; G8IY#  
 UpdateData(FALSE); T'fcc6D5p  
} Z.wA@ ~e  
zLD|/`  
void CCaptureDlg::SaveBmp() O3.C:?;x  
{ b`_w])Y@  
 CDC dc; &VBd~4|p  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); f2,1<^{  
 CBitmap bm; P=5NKg  
 int Width=GetSystemMetrics(SM_CXSCREEN); =q"eU=9  
 int Height=GetSystemMetrics(SM_CYSCREEN); `PL[lP-<  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ?K@t0a   
 CDC tdc; I=Oy-  
 tdc.CreateCompatibleDC(&dc); K$ v"Uk  
 CBitmap*pOld=tdc.SelectObject(&bm); vLO&Lpv  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); /"ymZI!k\  
 tdc.SelectObject(pOld); F#{gfh  
 BITMAP btm; K+T .o6+  
 bm.GetBitmap(&btm); i%#$*  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; =_[Z W  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); n tP|\E  
 BITMAPINFOHEADER bih; - ~4+w  
 bih.biBitCount=btm.bmBitsPixel; SjdZyJa  
 bih.biClrImportant=0; F.)!3YE  
 bih.biClrUsed=0; d3]hyTqbtm  
 bih.biCompression=0; ~^vC,]hU  
 bih.biHeight=btm.bmHeight; T#O??3/%$1  
 bih.biPlanes=1; jvVi%k  
 bih.biSize=sizeof(BITMAPINFOHEADER); h~7,`fo  
 bih.biSizeImage=size; 0"g@!gSrQ  
 bih.biWidth=btm.bmWidth; YGsS4ia*4i  
 bih.biXPelsPerMeter=0; m/`IGT5J  
 bih.biYPelsPerMeter=0; fRm}S>Nibb  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); p[WX'M0f  
 static int filecount=0; y>\S@I  
 CString name; F pt-V  
 name.Format("pict%04d.bmp",filecount++); &&L"&Rc  
 name=m_Path+name; ,eQ[Fi!!  
 BITMAPFILEHEADER bfh; $cVi;2$p  
 bfh.bfReserved1=bfh.bfReserved2=0; @1R8 -aa-r  
 bfh.bfType=((WORD)('M'<< 8)|'B'); w.N,)]h  
 bfh.bfSize=54+size; }xlKonk  
 bfh.bfOffBits=54; +@VYs*&&  
 CFile bf; <SVmOmJ-K  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ dZGbC9  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); j K8'T_Pah  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); P.sgRsL  
  bf.WriteHuge(lpData,size); k:#6^!b1  
  bf.Close(); d \>2  
  nCount++; <E\V`g  
 } PG,U6c #  
 GlobalFreePtr(lpData); D{'#er  
 if(nCount==1) &HM-g7|C0E  
  m_Number.Format("%d picture captured.",nCount); B(l-}|m_  
 else Oe1 t\  
  m_Number.Format("%d pictures captured.",nCount); sygH1|f  
  UpdateData(FALSE); TD04/ ISHT  
} @<_`2eW'/R  
=z:U~D  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) P ,K\  
{ NE"jh_m-  
 if(pMsg -> message == WM_KEYDOWN) AH.9A_dG  
 { xfSG~csoz  
  if(pMsg -> wParam == VK_ESCAPE) /'y5SlE[J  
   return TRUE; R#4 ^s  
  if(pMsg -> wParam == VK_RETURN) FoPginZ]J  
   return TRUE; J?P]EQU  
 } |t\|:E>" }  
 return CDialog::PreTranslateMessage(pMsg); uC~g#[I QM  
} . 9 LL+d  
|ia@,*KD  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ykq'g|  
{ .V%*{eHLL  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ >kdM:MK  
  SaveBmp(); yZSvn[f  
  return FALSE; oTOfK}  
} 6T^lS^  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ v5T9Y-{`  
 CMenu pop; vW' 5 ` %  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); b2h":G|s  
 CMenu*pMenu=pop.GetSubMenu(0); WfGH|u  
 pMenu->SetDefaultItem(ID_EXITICON); lv:U%+A  
 CPoint pt; #Y[H8TW  
 GetCursorPos(&pt); pH9HK  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); h'^FrWaU/  
 if(id==ID_EXITICON) N"DY?6  
  DeleteIcon(); !=[uT+v  
 else if(id==ID_EXIT) 7tH]*T9e>  
  OnCancel(); {e]NU<G ,  
 return FALSE; ,VD6s !(  
} qtSs)n  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 9y"TDo  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) p q-!WQ  
 AddIcon(); lSc,AOXp  
 return res; |l90g|isJ  
} Sa] mm/ G  
&]nd!N  
void CCaptureDlg::AddIcon() 6MrKi|'X@  
{ |}qjqtZ  
 NOTIFYICONDATA data;  a@|.;#FF  
 data.cbSize=sizeof(NOTIFYICONDATA); \; bW h  
 CString tip; g'G8 3F  
 tip.LoadString(IDS_ICONTIP); 3kLOoL?  
 data.hIcon=GetIcon(0); - s|t^  
 data.hWnd=GetSafeHwnd(); ~eo^`4O{{  
 strcpy(data.szTip,tip); GqjO>v fy  
 data.uCallbackMessage=IDM_SHELL; ZBj6KqfST%  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Js}tZ\+P75  
 data.uID=98; 0|2%#  E  
 Shell_NotifyIcon(NIM_ADD,&data); J1-):3A  
 ShowWindow(SW_HIDE); PN\V[#nS  
 bTray=TRUE; \:sk9k  
} \ j]~>9  
v+tO$QZ`  
void CCaptureDlg::DeleteIcon() ^\YQ_/\~L  
{ ~t9$IB  
 NOTIFYICONDATA data; (G5T%[/U  
 data.cbSize=sizeof(NOTIFYICONDATA); vug-n 8  
 data.hWnd=GetSafeHwnd(); ~yN(-I1P  
 data.uID=98; ChIoR:y>  
 Shell_NotifyIcon(NIM_DELETE,&data); \r]('x3S  
 ShowWindow(SW_SHOW); Za\RM[Z!I  
 SetForegroundWindow(); silp<13HN  
 ShowWindow(SW_SHOWNORMAL); 5c~'!:7  
 bTray=FALSE; Ck(.N  
} nx :)k-p_[  
I2*oTUSik  
void CCaptureDlg::OnChange() |p'i,.(c_W  
{ K%<GU1]-]  
 RegisterHotkey(); `9EVB;  
} _z:Qhe  
t/Z!O z6ZE  
BOOL CCaptureDlg::RegisterHotkey() Orc>.~+f%A  
{ w$% BlqN  
 UpdateData(); 6 ZHv,e`?  
 UCHAR mask=0; 7sN0`7  
 UCHAR key=0; w?;b7i  
 if(m_bControl) ")\ *2d  
  mask|=4; +GPd   
 if(m_bAlt) #f 9qlM32  
  mask|=2; t|".=3%G  
 if(m_bShift) 7+S44)w}~  
  mask|=1; Lnx2xoNk  
  key=Key_Table[m_Key.GetCurSel()]; 2^bgC~2C1  
 if(bRegistered){ ./!KE"!  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ^=#!D[xj>  
  bRegistered=FALSE; q/J3cXa{K  
 } 8AX3C s_G  
 cMask=mask;  f }-v  
 cKey=key; c V(H<"I  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); jQIV2TY[  
 return bRegistered; wKrdcWI,Z  
} L3>4t: 8  
\"bLE0~  
  四、小结 4i96UvkZ  
q]?+By-0  
  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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