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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: dD o6fP2  
  m^'~&!ba  
  一、实现方法 :q(D(mK  
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  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: )O9fhj)  
WqR7uiCi  
#pragma data_seg("shareddata") lS#7x h  
HHOOK hHook =NULL; //钩子句柄 X:U=MWc>  
UINT nHookCount =0; //挂接的程序数目 tg3zXJ4k_  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 [z^Od  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 !ZX&r{pJp  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey #s*k| j}  
static int KeyCount =0; }iMXXXBOT  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 El{r$-}  
#pragma data_seg() *q}FV2  
,}u,)7  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 i},d[  
C0gfJ~M )  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: ^u3*hl}YKy  
'frWu6]< 4  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR q?(A!1(u  
cKey,UCHAR cMask) }M^_Z#|,  
{ xUQdVrFU  
 BOOL bAdded=FALSE; '^e0Ud,  
 for(int index=0;index<MAX_KEY;index++){ g ,`F<CF9  
  if(hCallWnd[index]==0){ QjI#Cs}w  
   hCallWnd[index]=hWnd; b/z'`?[  
   HotKey[index]=cKey; _a fciyso  
   HotKeyMask[index]=cMask; y?"$(%3|  
   bAdded=TRUE; akMJ4EF/  
   KeyCount++;  ccRlql(  
   break; )4@M`8  
  } Y$>+U  
 } PL9<*.U"=  
 return bAdded; *3 !(*F@M,  
} dr.**fGYde  
//删除热键 (Z5q&#f  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) MST:.x ;  
{ h|K\z{ A  
 BOOL bRemoved=FALSE; JIVo=5c}  
 for(int index=0;index<MAX_KEY;index++){ +I*k0"gj6  
  if(hCallWnd[index]==hWnd){ h] <GTWj  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ _cR6ik zW(  
    hCallWnd[index]=NULL; NS h%t+XU]  
    HotKey[index]=0; ?0 HR(N(z!  
    HotKeyMask[index]=0; P a3{Ds  
    bRemoved=TRUE; I+*osk  
    KeyCount--; B^H4Q 4-  
    break; j'\>Nn+  
   } !&qx7eOSpP  
  } &Q2NU$  
 } yVT&rQ"{  
 return bRemoved; Um/CR!  
} 2TE\4j  
+8]W\<Kp  
T:be 9 5!,  
  DLL中的钩子函数如下: ]gH wfqx  
TihnSb  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) {F<)z% ^  
{ )>ug{M%g  
 BOOL bProcessed=FALSE; "w>rlsT<O  
 if(HC_ACTION==nCode) tX@ 0:RX%  
 { ]^Sd9ba  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 th5 X?so  
   switch(wParam) C_6GOpl  
   {  cR,'o'V/  
    case VK_MENU: 65'`uuPx  
     MaskBits&=~ALTBIT; Qk?jGXB>^  
     break; I).=v{@9V<  
    case VK_CONTROL: eVJ= .?r  
     MaskBits&=~CTRLBIT; NKRaQ r  
     break; c'"#q)  
    case VK_SHIFT: ,jAx%]@,I  
     MaskBits&=~SHIFTBIT; yb[{aL^4%  
     break; SCgyp(  
    default: //judge the key and send message _2NN 1/F5  
     break; ,.~ W  
   }  C/SapX  
   for(int index=0;index<MAX_KEY;index++){ s>LA3kT  
    if(hCallWnd[index]==NULL) uCY(:;[<  
     continue; W/#KX}4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @~JB\j9  
    { P]|J?$1K  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); y2oB]^z&n  
     bProcessed=TRUE; 1[26w_B3  
    } >`<Ued  
   } Mr$# e  
  }  aeEw#  
  else if((lParam&0xc000ffff)==1){ //有键按下 OG0r4^6Ly  
   switch(wParam) 7xX;MB &  
   { `Af{H/qiI  
    case VK_MENU: /p[|DJo M  
     MaskBits|=ALTBIT; b{Z^)u2X  
     break; AQE eIFH  
    case VK_CONTROL: Y'tqm&}  
     MaskBits|=CTRLBIT; 6"BtfQ")  
     break; W Atg  
    case VK_SHIFT: j9{O0[v  
     MaskBits|=SHIFTBIT; ^>3tYg&7  
     break; L4MxU 2  
    default: //judge the key and send message xnJjCEZ  
     break; aQz|!8Is  
   } mgmWDtxN  
   for(int index=0;index<MAX_KEY;index++){ Ah6wU|_-g  
    if(hCallWnd[index]==NULL) pWWL{@J  
     continue; %4?SY82  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ZC3tbhV  
    { <m?GJuQ'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); *LY~l  
     bProcessed=TRUE; L!CX &  
    } hB|H9+  
   } (%``EIc<8  
  }  !7 ei1  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ( rA\_FOJ  
   for(int index=0;index<MAX_KEY;index++){ ^L>MZA ?  
    if(hCallWnd[index]==NULL) #Tr;JAzVjG  
     continue; ygmv_YLjm  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) k! J4Z ${k  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); eXj\DjttG}  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 CBiU#h q  
   } 0_YxZS\  
  } BP)q6?Mz  
 } <C7M";54-  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); FY 1},sq  
}  ioE66-n  
+)/Rql(lY  
  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: 08TaFzP81  
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BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Y|{r vBKjf  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); -ET*M<  
$=e&q  
  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: u=p ;A1oy  
]_^"|RJ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) \_m\U.*  
{ .V5q$5j  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) \zk?$'d  
 { :FX'[7;p  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 +-Z"H)  
  SaveBmp(); OaD Alrm  
  return FALSE; #6Efev  
 } _n-VgPRn  
 …… //其它处理及默认处理 3q~":bpAp  
} P!`Q_h6a  
37j\D1Y  
eT7!a']x  
  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。 ?z\q Mu  
F&W0DaH  
  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。 SREDM  
Tf&f`/  
  二、编程步骤 S5:"_U  
|i,zY{GI+2  
  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"; OqfhCNAY  
Bo\a  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; WUE)SVf  
=:xV(GK}  
  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; 'Z*\1Ci  
u)q2YLK8  
  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; e3yorQ][  
5PPPd-'Z_  
  5、 添加代码,编译运行程序。 _H~pH7WU  
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三、程序代码 @{J!6YGh  
N.fQ7z=Z(M  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL "e1{V8 4  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) hj^G} 4  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ E5,%J  
#if _MSC_VER > 1000 ?~VWW<lR  
#pragma once VfL]O8P>  
#endif // _MSC_VER > 1000 6=Y3(#Ddt  
#ifndef __AFXWIN_H__ c]AKeq]  
#error include 'stdafx.h' before including this file for PCH mhHA!:Y  
#endif rd&*j^?  
#include "resource.h" // main symbols 8{}Pj  
class CHookApp : public CWinApp ZI2K-z'e  
{ gmF_~"^34  
 public: ZYwBw:y}y  
  CHookApp(); %5Q7#xU  
  // Overrides f"5lOzj`C  
  // ClassWizard generated virtual function overrides &y#\1K  
  //{{AFX_VIRTUAL(CHookApp) ^]#Ptoz^(l  
 public: [OFTP#}c  
  virtual BOOL InitInstance(); )1ZJ  
  virtual int ExitInstance(); W,9k0t  
  //}}AFX_VIRTUAL &.cGj @1!J  
  //{{AFX_MSG(CHookApp) Dg9--wI}I9  
  // NOTE - the ClassWizard will add and remove member functions here. ;ZxK3/(7  
  // DO NOT EDIT what you see in these blocks of generated code ! rQd1Ch  
  //}}AFX_MSG boC>N   
  DECLARE_MESSAGE_MAP() h3UZ|B0=  
}; Gx(KN57D  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); wf~5lpI[  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); xWenKY,  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); }AMYU>YE=  
BOOL InitHotkey(); %8Z|/LGg  
BOOL UnInit(); Pqr Ou  
#endif 7':5  
(]zl$*k  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. k=h/i8i2z  
#include "stdafx.h" 5p]urfN-f  
#include "hook.h" WryW3];0OR  
#include <windowsx.h> mFgb_Cd  
#ifdef _DEBUG ),D`ZRXS  
#define new DEBUG_NEW gZ `#tlA~  
#undef THIS_FILE i GEQXIr3  
static char THIS_FILE[] = __FILE__; E i\J9zt  
#endif )RAv[U1  
#define MAX_KEY 100 SxLHFN]  
#define CTRLBIT 0x04 r 48;_4d)D  
#define ALTBIT 0x02 q_9N+-?{7  
#define SHIFTBIT 0x01 nK?k<  
#pragma data_seg("shareddata") DU*g~{8T$  
HHOOK hHook =NULL; .v #0cQX+.  
UINT nHookCount =0; /H\^l.|vk  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 4AJu2Hp  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ;*>QG6Fh  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ]Vf8mkDGO  
static int KeyCount =0; M@!]U:5~V  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift YWcui+4p}  
#pragma data_seg() &P,4EaC9;  
HINSTANCE hins; =B/s H N  
void VerifyWindow(); (?*mh?  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Y-neD?VN  
//{{AFX_MSG_MAP(CHookApp) ySr091Q  
// NOTE - the ClassWizard will add and remove mapping macros here. m 1'&{O:  
// DO NOT EDIT what you see in these blocks of generated code! K*HVn2OV  
//}}AFX_MSG_MAP &|'Kut?8  
END_MESSAGE_MAP() .swgXiRvs  
J#Ne:Aj_  
CHookApp::CHookApp() PoBu kOv  
{ NR;S3-Iq(  
 // TODO: add construction code here, z/P^-N>  
 // Place all significant initialization in InitInstance A_6/umF[ZA  
} >"sKfiM)b  
Tg <>B  
CHookApp theApp; j-I6QUd  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 4Rrw8Bw  
{ =CG!"&T  
 BOOL bProcessed=FALSE; \K_!d]I {  
 if(HC_ACTION==nCode) T,xVQ4J?  
 { Y bn=Gy  
  if((lParam&0xc0000000)==0xc0000000){// Key up VxPTh\O*[  
   switch(wParam) Y00i{/a 8  
   { bAy5/G!_R  
    case VK_MENU: st'?3A  
     MaskBits&=~ALTBIT; nI|Lx`*v  
     break; HkfSx rTgQ  
    case VK_CONTROL: QAOk  
     MaskBits&=~CTRLBIT; R+ #.bQg  
     break; @0/@p"j  
    case VK_SHIFT: -+ IX[  
     MaskBits&=~SHIFTBIT; p@NEr,GB  
     break; &23ss/  
    default: //judge the key and send message COkLn)+0  
     break; eLt Cxe  
   } 1CS]~1Yp:  
   for(int index=0;index<MAX_KEY;index++){ PTI'N%W  
    if(hCallWnd[index]==NULL) vU \w3  
     continue; AP?{N:+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) F"@'(b  
    { 3$kv%uf{  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); x9&tlKKxf  
     bProcessed=TRUE; JI[rIL \Ey  
    } N?U&(@p  
   } `M pC<sit  
  } PE;0 jgsiI  
  else if((lParam&0xc000ffff)==1){ //Key down qI V`zZc  
   switch(wParam) 2)I'5 ?I  
   { G.q^Zd#.T  
    case VK_MENU: v;F+fOo  
     MaskBits|=ALTBIT; T h- vG  
     break; rY_C3;B  
    case VK_CONTROL: -JyODW#j  
     MaskBits|=CTRLBIT; n4r( Vg1GS  
     break; <8z[,X}bM  
    case VK_SHIFT: 1 Z$99  
     MaskBits|=SHIFTBIT; =|{,5="  
     break; w3?t})PB&  
    default: //judge the key and send message Kz*AzB  
     break; iqv\ag  
   } k`4\.m"&  
   for(int index=0;index<MAX_KEY;index++) E*T84Jh6  
   { T=f;n;/>  
    if(hCallWnd[index]==NULL) DRmh(T  
     continue; 2G:{FY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $RFu m'`5  
    { G/RheH G  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); <GFB'`L  
     bProcessed=TRUE; KAZkVL  
    } E6^S2J2  
   } tgF(=a]o  
  } _6ax{:/Q  
  if(!bProcessed){ C5lD Hw[CX  
   for(int index=0;index<MAX_KEY;index++){ ^J5V!i$  
    if(hCallWnd[index]==NULL) ~3-YxCn%  
     continue; oj4)7{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) EV7+u0uN&Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ,IVr4#w0=  
   } +KwF U  
  } e[ k;SSs  
 } >0;"qT  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); XY t8vJ  
} HI?~t| [y  
JpHsQ8<  
BOOL InitHotkey() r`E1<aCr|  
{ g7Q*KA+  
 if(hHook!=NULL){ *ej o6>  
  nHookCount++; _ L:w;Oy9T  
  return TRUE; my\oC^/9  
 } Z FrXw+  
 else +uGP(ONY  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);  v=Bh A9[  
  if(hHook!=NULL) Sdu@!<?B  
   nHookCount++; I3[RaZ2z{  
  return (hHook!=NULL); A[,"jh  
} ^5@"|m1  
BOOL UnInit() tIy/QN_42  
{ K'rs9v"K|  
 if(nHookCount>1){ Nm:<rI,^  
  nHookCount--; N,+g/o\f  
  return TRUE; hG3$ ]i9  
 } ,HO/Q6;N  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 0v)mgrl=,  
 if(unhooked==TRUE){ ?bYQZJ>&  
  nHookCount=0; gl\{QcI8<  
  hHook=NULL; d=OO(sf  
 } I EsD=  
 return unhooked; P:h4  
} (Gk]<`d#N  
G@I_6c E  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) T^H) lC#R  
{ Xqva&/-  
 BOOL bAdded=FALSE; v5bb|o[{K  
 for(int index=0;index<MAX_KEY;index++){ vc1GmB  
  if(hCallWnd[index]==0){ ~4X!8b_  
   hCallWnd[index]=hWnd; Mw7UU1 ei  
   HotKey[index]=cKey; Q+js2?7^  
   HotKeyMask[index]=cMask; 2+Y`pz47W  
   bAdded=TRUE; [Ik B/Xbw|  
   KeyCount++; .;v'oR1x5  
   break; o>rlrqr?_  
  } aTL7"Myp  
 } 5Fm? ,^  
 return bAdded; <?@46d?C  
} (2\ekct ^  
(>lqp%G~  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ej53O/hP  
{ .0;k|&eBD  
 BOOL bRemoved=FALSE; 0YRYCO$  
 for(int index=0;index<MAX_KEY;index++){ _q4dgi z  
  if(hCallWnd[index]==hWnd){ CbaAnm1  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ gY^TBR0?m  
    hCallWnd[index]=NULL; |B WK"G  
    HotKey[index]=0; H9m2Whq  
    HotKeyMask[index]=0; ?-v?SN#  
    bRemoved=TRUE; I:)#U[tn0  
    KeyCount--;  1`JN  
    break; soK_l|z:J  
   } tJfN6  
  } bD[W~ku  
 } \ bmboNe  
 return bRemoved; t4W0~7   
} 2Sd6b 2-  
&`y_R'  
void VerifyWindow() {YLJKu!M  
{  p.Yg-CA  
 for(int i=0;i<MAX_KEY;i++){ _BaS\U%1(  
  if(hCallWnd!=NULL){ n/Z =q?_  
   if(!IsWindow(hCallWnd)){ `X03Q[:q"[  
    hCallWnd=NULL; uXa}<=O  
    HotKey=0; R,Uy3N  
    HotKeyMask=0; @!HMd{r  
    KeyCount--; ptL}F~  
   } 'QS~<^-j"  
  } `.Q3s?1F  
 } 0#GwhB  
} U.} =j'Us+  
yAkN2  
BOOL CHookApp::InitInstance() j'b4Sb s-f  
{ 4KB?g7_*  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Mo r-$a8  
 hins=AfxGetInstanceHandle(); #`wfl9tj  
 InitHotkey(); R.$Y1=U6  
 return CWinApp::InitInstance(); iEO2Bil]  
} EB<tX`Wp  
f3|=T8"t  
int CHookApp::ExitInstance() Q#bo!]H{t  
{ *3oQS"8  
 VerifyWindow(); oQB1fs  
 UnInit(); iJ#oI@s  
 return CWinApp::ExitInstance(); QZP;k!"w  
} Ykq }9  
KywT Oq  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file NT:>.~ah@&  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) JH,bSb  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ v xZUtyJfe  
#if _MSC_VER > 1000 m5g: Q  
#pragma once oK[,xqyA  
#endif // _MSC_VER > 1000 Cagq0-:(p  
E&v-(0  
class CCaptureDlg : public CDialog 82l";;n4p  
{ gvt4'kp  
 // Construction 0kEq|k9  
 public: skArocs  
  BOOL bTray; 6% axbB  
  BOOL bRegistered; K?eo)|4)DB  
  BOOL RegisterHotkey(); g 0=t9J  
  UCHAR cKey; v65r@)\`  
  UCHAR cMask; K",]_+b  
  void DeleteIcon(); b=go"sJ@>(  
  void AddIcon(); Um&@ 0C+L  
  UINT nCount; 1 .k}gl0<  
  void SaveBmp(); ~kFRy{z  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor GoXHVUyp  
  // Dialog Data Z)~4)71Y:  
  //{{AFX_DATA(CCaptureDlg) B}T72!a  
  enum { IDD = IDD_CAPTURE_DIALOG }; l/M+JT~R  
  CComboBox m_Key; g}h0J%s  
  BOOL m_bControl; I[C.iILL  
  BOOL m_bAlt; J(L$pIM  
  BOOL m_bShift; p 1fnuN |,  
  CString m_Path; (#BA{9T,^  
  CString m_Number; 6?~pjMV  
  //}}AFX_DATA N|d@B{a(  
  // ClassWizard generated virtual function overrides `;hBO#(H0}  
  //{{AFX_VIRTUAL(CCaptureDlg) |a3b2x,  
 public: sIM`Q%  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 1yf&ck1R  
 protected: SS-   
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 81g0oVv  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Jl}7]cVq#  
  //}}AFX_VIRTUAL ~=Sr0+vV  
  // Implementation ;T(^riAEl  
 protected: g9.hR8X  
  HICON m_hIcon; M?97F!\U  
  // Generated message map functions 8i"fhN3?Y  
  //{{AFX_MSG(CCaptureDlg) Rh^$0Q*2  
  virtual BOOL OnInitDialog(); {[dqXG$v `  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); o)DKP>IM#  
  afx_msg void OnPaint(); JJa?"82FXZ  
  afx_msg HCURSOR OnQueryDragIcon(); i[ lH@fJm_  
  virtual void OnCancel(); O%{>Zo_<  
  afx_msg void OnAbout(); Nrh`DyF0D!  
  afx_msg void OnBrowse(); 'ZZ/:MvQa  
  afx_msg void OnChange(); U)6JJv  
 //}}AFX_MSG ]5CFL$_Q{  
 DECLARE_MESSAGE_MAP() ~*Wb MA  
}; H2p;J#cv@  
#endif q3t@)+l>*  
uWQ.h ,  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ==9Ez  
#include "stdafx.h" P'';F}NwfX  
#include "Capture.h" V00zk`PH  
#include "CaptureDlg.h" 4|UIyDt8  
#include <windowsx.h> Pr"ESd>Y  
#pragma comment(lib,"hook.lib") qKXn=J/0tA  
#ifdef _DEBUG s,= ^V/c  
#define new DEBUG_NEW C2T,1=  
#undef THIS_FILE )c_ll;%  
static char THIS_FILE[] = __FILE__; _\zf XHp  
#endif \/%mabLK  
#define IDM_SHELL WM_USER+1 fC[gu$f][  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); rCYn YA  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); hR2.w/2j  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; K(Nk|gQ  
class CAboutDlg : public CDialog &/" qOZAs  
{ 3m'6cMQ  
 public: BDg /pDnwg  
  CAboutDlg(); G<I5%Yo6G  
  // Dialog Data 'tj4;+xf^  
  //{{AFX_DATA(CAboutDlg) IG\\RYr  
  enum { IDD = IDD_ABOUTBOX }; / e,lD)  
  //}}AFX_DATA >#Y q&@G  
  // ClassWizard generated virtual function overrides Bf.RYLsh6  
  //{{AFX_VIRTUAL(CAboutDlg) xYq8\9Qb  
 protected: qYs6PLC  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Gy5W;,$q  
  //}}AFX_VIRTUAL  qn .  
  // Implementation TnrMR1Zx  
 protected: JP]K\nQx'  
  //{{AFX_MSG(CAboutDlg) H+Wd#7l,  
  //}}AFX_MSG .0 K8h:I  
  DECLARE_MESSAGE_MAP() 0 N(2[s_A  
}; R:E:Y|&#  
LxO'$oKZV  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 0J" 3RTt  
{ &W%TY:Da|  
 //{{AFX_DATA_INIT(CAboutDlg) _nt%&f  
 //}}AFX_DATA_INIT !E8JpE|z#  
} ,$Mw/fA  
:d;5Q\C`  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 2t'&7>Ys{  
{ :>;#/<3{  
 CDialog::DoDataExchange(pDX); J&?kezs  
 //{{AFX_DATA_MAP(CAboutDlg) &nss[w$%C  
 //}}AFX_DATA_MAP gV c[`( @h  
} 0qv)'[O  
oT'XcMn  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Jq->DzSmj/  
 //{{AFX_MSG_MAP(CAboutDlg) W~qo `r  
 // No message handlers uE2Y n`Ha  
 //}}AFX_MSG_MAP ME(!xI//JZ  
END_MESSAGE_MAP() QZY (S*Up  
VmW_,  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) b({2|R  
: CDialog(CCaptureDlg::IDD, pParent) BdTj0{S1u  
{ ;%)i/MGEB  
 //{{AFX_DATA_INIT(CCaptureDlg) XpGom;z^c  
  m_bControl = FALSE; [O3R(`<e5  
  m_bAlt = FALSE; F^ f]*MhT"  
  m_bShift = FALSE; (0S"ZT  
  m_Path = _T("c:\\"); LImD]e`  
  m_Number = _T("0 picture captured."); sdY6_HtE  
  nCount=0; !dGgLU_  
  bRegistered=FALSE; 9D bp`%j  
  bTray=FALSE; 6\`,blkX  
 //}}AFX_DATA_INIT 6\bbP>ql  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 s}.nh>Q  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ;J:YNup  
} OCd[P1Y]  
SaNx;xgi  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) $]vR,E  
{ {>:2Ff]O:  
 CDialog::DoDataExchange(pDX); cIX59y#7  
 //{{AFX_DATA_MAP(CCaptureDlg) :p{iBDA  
  DDX_Control(pDX, IDC_KEY, m_Key); f,$CiZ"  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); BBX4^;t  
  DDX_Check(pDX, IDC_ALT, m_bAlt); X!@Gv:TD  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); gyPF!"!5dq  
  DDX_Text(pDX, IDC_PATH, m_Path); h ( Z7a%_  
  DDX_Text(pDX, IDC_NUMBER, m_Number); O;XF'r_  
 //}}AFX_DATA_MAP Og["X0j  
} myYe~f4=HQ  
9'tM65K  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) mb#)w`<  
//{{AFX_MSG_MAP(CCaptureDlg) Yv{AoL~  
 ON_WM_SYSCOMMAND() 6l=n&YO  
 ON_WM_PAINT() {Hb _o)S  
 ON_WM_QUERYDRAGICON() &I70veNY  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) jq[>PvR  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) q/[)mr|~  
 ON_BN_CLICKED(ID_CHANGE, OnChange) @cx!m   
//}}AFX_MSG_MAP i55']7+0  
END_MESSAGE_MAP() eRf 8'-"#-  
+5Mx0s(5  
BOOL CCaptureDlg::OnInitDialog() 6};Sn/ 8  
{ HdGy$m`  
 CDialog::OnInitDialog(); ev; &$Hc  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 9(C Ke,  
 ASSERT(IDM_ABOUTBOX < 0xF000); -~5yl}  
 CMenu* pSysMenu = GetSystemMenu(FALSE); xsa* XR  
 if (pSysMenu != NULL) 5=dg4"b]  
 { 3 3V/<v  
  CString strAboutMenu; XdB8Oj~~  
  strAboutMenu.LoadString(IDS_ABOUTBOX); d#(xP2  
  if (!strAboutMenu.IsEmpty()) Z/0M9 Q%  
  { >Nov9<p  
   pSysMenu->AppendMenu(MF_SEPARATOR); R(:q^?  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); )a.U|[:y[+  
  } .8,lhcpY  
 } !,\]> c  
 SetIcon(m_hIcon, TRUE); // Set big icon -Oo$\=d  
 SetIcon(m_hIcon, FALSE); // Set small icon 5%Q!R%  
 m_Key.SetCurSel(0); g><sZqj8tt  
 RegisterHotkey(); V7&L+]!  
 CMenu* pMenu=GetSystemMenu(FALSE); G~_dSa@g G  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); JeO(sj$e  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ]@'YlPU  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ";jhj:Xj  
 return TRUE; // return TRUE unless you set the focus to a control 7~IAgjo,@  
} rR7}SEa  
m1(rAr1  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) dkXK0k  
{ T# 8O:  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) &BQ`4j~.  
 { iQA f  
  CAboutDlg dlgAbout; F`3I~(  
  dlgAbout.DoModal(); rUj]6j=e  
 } y :457R2F  
 else L:S[QwQu8  
 { <5nz:B/  
  CDialog::OnSysCommand(nID, lParam); O=yUA AD$  
 } 'a0$74fz  
} z-()7WY  
k: c)|2  
void CCaptureDlg::OnPaint() !7_Q_h',  
{ 5T,`j=\  
 if (IsIconic()) a.q=  
 { SL*B `P~{  
  CPaintDC dc(this); // device context for painting #"TTI vd0  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); En[cg  
  // Center icon in client rectangle *t~( _j  
  int cxIcon = GetSystemMetrics(SM_CXICON); #t;@x_2yD\  
  int cyIcon = GetSystemMetrics(SM_CYICON); -qs9a}iL  
  CRect rect; WT1ch0~2  
  GetClientRect(&rect); P[D ^*}  
  int x = (rect.Width() - cxIcon + 1) / 2; H3&$:h  
  int y = (rect.Height() - cyIcon + 1) / 2; 2?HLEiI1  
  // Draw the icon .i&]VGv  
  dc.DrawIcon(x, y, m_hIcon); "6.kZ$`%  
 } @o_-UsUX  
 else R7vO,kZ6Q  
 { )4DF9JpD  
  CDialog::OnPaint(); xvb5-tK -  
 } oas}8A)  
} A9[l5E  
32dR`qb  
HCURSOR CCaptureDlg::OnQueryDragIcon() 3]V" 9+  
{ Uc6P@O*,  
 return (HCURSOR) m_hIcon; CY9`ztO*  
}  Qq>M}  
hH%@8'1v  
void CCaptureDlg::OnCancel() 2jA-y!(e  
{ JEj.D=@[  
 if(bTray) D;m>9{=  
  DeleteIcon(); |o6B:NH,rg  
  CDialog::OnCancel(); uP<tP:  
} ZMoN  
Td?a=yu:J  
void CCaptureDlg::OnAbout() G/=tC8eX  
{ ^hLAMaR  
 CAboutDlg dlg; FL- sXg  
 dlg.DoModal(); O TSbhI'v  
} ;jS~0R  
A[^fG_l4  
void CCaptureDlg::OnBrowse() ?9.SwIxU&  
{ KxqJlben  
 CString str; 8eQ 4[wJY  
 BROWSEINFO bi; <w<&,xM  
 char name[MAX_PATH]; um ,Zt  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); /dj r_T  
 bi.hwndOwner=GetSafeHwnd(); d/N&bTg:  
 bi.pszDisplayName=name; h9$Ov`N(%  
 bi.lpszTitle="Select folder"; 3y<;fdS7  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 6f(K'v  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ?X~Keb  
 if(idl==NULL) 94\k++kc  
  return; ?o?~Df&  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); "1yXOy^2  
 str.ReleaseBuffer(); Fn1|Wt*  
 m_Path=str; J1KV?aR  
 if(str.GetAt(str.GetLength()-1)!='\\') rISg`-  
  m_Path+="\\"; p78X,44xg  
 UpdateData(FALSE); *+rO3% ;t  
} ;(5b5PA  
CWHTDao  
void CCaptureDlg::SaveBmp() C/U^8,6\n  
{ M|6 l  
 CDC dc; B^Fe.ty  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 3%p^>D\  
 CBitmap bm; *;5P65:u$>  
 int Width=GetSystemMetrics(SM_CXSCREEN); &3#19v7/  
 int Height=GetSystemMetrics(SM_CYSCREEN); Pm*FA8a7  
 bm.CreateCompatibleBitmap(&dc,Width,Height); s8Bbe t  
 CDC tdc; h0_od/D1r  
 tdc.CreateCompatibleDC(&dc); oF7o"NHaWa  
 CBitmap*pOld=tdc.SelectObject(&bm); ,* !HN &  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); S&^i*R4]  
 tdc.SelectObject(pOld); Xz4T_-X8d  
 BITMAP btm; 76Ho\}-U">  
 bm.GetBitmap(&btm); Ahv%Q%m%2  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; g 67;O(3  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ~|QhWgq  
 BITMAPINFOHEADER bih; Wo+fMn(O  
 bih.biBitCount=btm.bmBitsPixel; sba+J:#w  
 bih.biClrImportant=0; Rw-!P>S$  
 bih.biClrUsed=0; 8&t3a+8l  
 bih.biCompression=0; *.qm+#8W  
 bih.biHeight=btm.bmHeight; $q%r}Cdg  
 bih.biPlanes=1; ^}8qPBz  
 bih.biSize=sizeof(BITMAPINFOHEADER); ;n`SF~CU  
 bih.biSizeImage=size; Ti:PKpc  
 bih.biWidth=btm.bmWidth; LpN_s#  
 bih.biXPelsPerMeter=0; =n7QLQU  
 bih.biYPelsPerMeter=0; :|%k*z  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); %zsY=qT  
 static int filecount=0; @A?Ss8p'  
 CString name; tX)l_ ?jVH  
 name.Format("pict%04d.bmp",filecount++); R+}7]tva6C  
 name=m_Path+name; aGSix}b1P  
 BITMAPFILEHEADER bfh; ny'?Hl'Q  
 bfh.bfReserved1=bfh.bfReserved2=0; J'4Pp<  
 bfh.bfType=((WORD)('M'<< 8)|'B'); \k&2nYVHf  
 bfh.bfSize=54+size; kn9ul3c  
 bfh.bfOffBits=54; )jc`_{PQg  
 CFile bf; F/.nr  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ s aY;[bz}  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ))ArM-02  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ]l/ PyX  
  bf.WriteHuge(lpData,size); ^E-BB 6D  
  bf.Close(); 7\.{O$Q  
  nCount++; x)GpNkx:  
 } GP<PU  
 GlobalFreePtr(lpData); CvkZ<i){  
 if(nCount==1) b%A+k"d  
  m_Number.Format("%d picture captured.",nCount); 0K T^V R  
 else (t[sSl  
  m_Number.Format("%d pictures captured.",nCount); - ,YoVB!T  
  UpdateData(FALSE); |YEq<wbQ  
} xNAX)v3Z  
we?# Dui  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ~[a6  
{ v_G1YC7TU  
 if(pMsg -> message == WM_KEYDOWN) 1xBgb/+  
 { GoSdo  
  if(pMsg -> wParam == VK_ESCAPE) 7H=V|Btnc  
   return TRUE; 9:9gam  
  if(pMsg -> wParam == VK_RETURN) 3:wN^!A}ve  
   return TRUE; !pT i.3  
 }  VB&` S+-  
 return CDialog::PreTranslateMessage(pMsg); [a201I0 -  
} 1|bg;X9+  
<b>g^ `}?D  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) + PAb+E|,  
{ {#U 3A_y  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ W!jg  
  SaveBmp(); t nvCtuaR  
  return FALSE; e)BU6m%  
} ~S\y)l\wZ  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ y) .dw(  
 CMenu pop; ag02=}Q'r  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); M1HGXdN*B  
 CMenu*pMenu=pop.GetSubMenu(0); #EG$HX]  
 pMenu->SetDefaultItem(ID_EXITICON); wa1Qt  
 CPoint pt; y\?NB:=%  
 GetCursorPos(&pt); z*,J0)<Q  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); A  r,fmq  
 if(id==ID_EXITICON) o{[w6^D7  
  DeleteIcon(); b%wm-p  
 else if(id==ID_EXIT) +Z7:(o<  
  OnCancel(); BS*Y3$  
 return FALSE; XU5GmGu_+  
} vCX 54  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); fug F k  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) yt+d f0l  
 AddIcon(); [x[ nTIg  
 return res; 2]:Z7Ji  
} ]L6[ vJHx  
&*j# [6  
void CCaptureDlg::AddIcon()  Q'~3Ik  
{ [6cF#_)*  
 NOTIFYICONDATA data; +?9. &<?  
 data.cbSize=sizeof(NOTIFYICONDATA); 7 MZ(tOR  
 CString tip; 328gTP1  
 tip.LoadString(IDS_ICONTIP); CpLLsphy  
 data.hIcon=GetIcon(0); ;Z6ngS  
 data.hWnd=GetSafeHwnd(); B>r>z5  
 strcpy(data.szTip,tip); Fa+#bX7  
 data.uCallbackMessage=IDM_SHELL; uz;zmK  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; a 8}!9kL  
 data.uID=98; K#;EjR4H  
 Shell_NotifyIcon(NIM_ADD,&data); e| Sw+fhy<  
 ShowWindow(SW_HIDE); :meq4!g{1  
 bTray=TRUE; #Y<QEGb(  
} zBjbH=  
|V-)3 #c  
void CCaptureDlg::DeleteIcon() H: rrY  
{ eKvQS}11  
 NOTIFYICONDATA data; hqc)Ydg_%  
 data.cbSize=sizeof(NOTIFYICONDATA); |C`.m |  
 data.hWnd=GetSafeHwnd(); )(V!& w6  
 data.uID=98; s;W1YN  
 Shell_NotifyIcon(NIM_DELETE,&data); 6 K-jje;)  
 ShowWindow(SW_SHOW); 8~|tl,  
 SetForegroundWindow(); 'U*Kb  
 ShowWindow(SW_SHOWNORMAL); Y]neTX [ef  
 bTray=FALSE; g9G 8;  
} jM[]Uh  
uRnSwJ"hE  
void CCaptureDlg::OnChange() ?#gYu %7DN  
{ >A.m`w  
 RegisterHotkey(); "w&G1kw5I  
} +`&-xq76  
M32Z3<  
BOOL CCaptureDlg::RegisterHotkey() l<-0@(x)  
{ ov|/=bzro  
 UpdateData(); WUK{st.z  
 UCHAR mask=0; aTFT'(O,  
 UCHAR key=0; ^oXLk&d  
 if(m_bControl) oGKk2oP  
  mask|=4; L(`Rf0smt  
 if(m_bAlt) Dssecc'  
  mask|=2; BvqypLI  
 if(m_bShift) k.6(Q_TS  
  mask|=1; i1 ^#TC$x  
  key=Key_Table[m_Key.GetCurSel()]; QLDld[  
 if(bRegistered){ V9/PkuT  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); eb=#{  
  bRegistered=FALSE; {w52]5l  
 } bCmlSu  
 cMask=mask; q~6((pWi|  
 cKey=key; ss'`[QhR2  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); rvETt  
 return bRegistered; JAU:Wqlg1  
} bR}=bp4K  
f0ME$:2  
  四、小结 VQ/Jz5^  
LWIPq"  
  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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