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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: '0MH-M  
  kaUEv\T   
  一、实现方法 !7fL'  
qHtonJc  
  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: &X`zk  
LagHzCB  
#pragma data_seg("shareddata") ,+mH1#-3  
HHOOK hHook =NULL; //钩子句柄 by0@G"AE+  
UINT nHookCount =0; //挂接的程序数目 kbcqUE  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 9irT}e  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 %j7HIxZh  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey jVxX! V  
static int KeyCount =0; 9%  wVE]  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 NKX62 ZC  
#pragma data_seg() ^h^\kW'#  
 =o? Q0  
  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。 mQiVTIP3[O  
]?"1FSu-8r  
  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: +.Cx.Nf(  
>v9@p7Dn  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR %'`L+y  
cKey,UCHAR cMask) Xpp%j  
{ E,EpzB$_dj  
 BOOL bAdded=FALSE; 873'=m&  
 for(int index=0;index<MAX_KEY;index++){ tY>_ +)oi  
  if(hCallWnd[index]==0){ g6V>_|  
   hCallWnd[index]=hWnd; x } X1 O)  
   HotKey[index]=cKey; VQe@H8>3  
   HotKeyMask[index]=cMask; 3l?-H|T  
   bAdded=TRUE; A KjCm*K(q  
   KeyCount++; DM[gjfMXu  
   break; 23|R $s>}i  
  } |w)S &+  
 } 2n3g!M6~  
 return bAdded; [e.@Yx_}  
} "eOFp\vPr  
//删除热键 G~$[(Fhk  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) j7u\.xu9  
{ hxX-iQya  
 BOOL bRemoved=FALSE; 1O@y >cV  
 for(int index=0;index<MAX_KEY;index++){ ;:l>Kac  
  if(hCallWnd[index]==hWnd){ x+;"(]#  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ vOnhJN  
    hCallWnd[index]=NULL; *v6 j7<H  
    HotKey[index]=0; r@v_hc  
    HotKeyMask[index]=0; YI!@ ,t  
    bRemoved=TRUE; 9@{=2 k  
    KeyCount--; c!20(( 2|I  
    break; jDKL}x  
   } # qPWJ  
  } V 'e _gH  
 } eJ2$DgB}t  
 return bRemoved; Pko2fJt1  
} J*}Qnl+  
?loP18S b  
2Ysl|xRo  
  DLL中的钩子函数如下: ZBcT@hxm  
@b2JR^  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) -ZKo/ N>6}  
{ `j1(GQt  
 BOOL bProcessed=FALSE; ?V >{3  
 if(HC_ACTION==nCode) ;c;5O@R}3  
 { ouO<un  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 AC& }8w[>u  
   switch(wParam) FXd><#U  
   {  i<>zN^zn  
    case VK_MENU: p^/6Rb"e  
     MaskBits&=~ALTBIT; #lo1GoL\  
     break; \&#pJBBG  
    case VK_CONTROL: 3<vw#]yL  
     MaskBits&=~CTRLBIT; n |Is&fy  
     break; w>6~ zAh  
    case VK_SHIFT: '$m uA\  
     MaskBits&=~SHIFTBIT; 8<X,6  
     break; !hS~\+E  
    default: //judge the key and send message ` fm^#Nw  
     break; u?-X07_  
   } PY{])z3N  
   for(int index=0;index<MAX_KEY;index++){ /QT"5fxKJ  
    if(hCallWnd[index]==NULL) 8O='Q-& 8  
     continue; %g+*.8;"b  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))  jcVK4jW  
    { N sNk  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); v$_YZm{!<  
     bProcessed=TRUE; :^H#i:4  
    } c(5r  
   } fBZAO  
  } <~ 9a3c?  
  else if((lParam&0xc000ffff)==1){ //有键按下 nPh| rW=  
   switch(wParam) ER4j=O#  
   { `:&jbd4H  
    case VK_MENU: B^yA+&3HI  
     MaskBits|=ALTBIT; Cg4l*"_  
     break; CpG]g>]L&[  
    case VK_CONTROL: Okt0b|=`1*  
     MaskBits|=CTRLBIT; }_vUsjK  
     break; ;{%R'  
    case VK_SHIFT: ^_C]?D?  
     MaskBits|=SHIFTBIT; IA&NMf;{  
     break; 0S}ogU[k  
    default: //judge the key and send message /rQ[Ik$|  
     break; \ =(r6X  
   } +* AdSzX  
   for(int index=0;index<MAX_KEY;index++){ .W/#$s|X\  
    if(hCallWnd[index]==NULL) N# ?}r>W3  
     continue; .{}=!>U2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) h:qt?$]J  
    { %hM8px4d  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); |2'u@<(Z/  
     bProcessed=TRUE; q` Z_Bw  
    } ZQV,gIFys  
   } 'Bc{N^  
  } %D9,Femt  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 o:x,zfW  
   for(int index=0;index<MAX_KEY;index++){ Z'F=Xw6;b  
    if(hCallWnd[index]==NULL) $22_>OsA  
     continue; -o`Eka!ELz  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) c@&-c[k^W  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); rz'A#-?'oG  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 IA$)E  
   } %40uw3  
  } v0|[w2Q2  
 } ecg>_%.>  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); k.MAX8  
} MfJ8+3@K  
Nu]& ?  
  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_tc\}I]  
F!yr};@^p  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); _${//`ia=  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); S>y(3E]I  
#x^dR-@   
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: Cvk n2T  
6~#$bp^-  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) gqCDF H  
{ czH`a=mjH  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) rQ+2 -|#  
 { Nd] w I|>  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 o fw0_)!Q  
  SaveBmp(); ~l SdWUk>  
  return FALSE; uOU?-WtPz  
 } WhY8#B'?  
 …… //其它处理及默认处理 xP+HdA2X  
} |1z?#@BH  
iJH;OV;P  
.PHz   
  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。 %%-hax.x0X  
h0v4!`PQ-  
  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。 XC NM  
]z{f)`;I  
  二、编程步骤 AR}q<k6E  
/-_<RQ  
  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"; 'tRaF  
Kq. MmR!gl  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; s2'] "wM  
&t0toEj  
  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; } eL*gy  
_ U%fD|t  
  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; :j=/>d],%  
/`)>W :  
  5、 添加代码,编译运行程序。 'i5V6yB  
#4Z]/D2G  
三、程序代码 kCoTz"Z-  
qwz_.=5E6  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL K;fRDE) {  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) UCv9G/$  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ XX@@tzN  
#if _MSC_VER > 1000 NjL^FqA[  
#pragma once )X dpzWod  
#endif // _MSC_VER > 1000 }>|!Mf]W?R  
#ifndef __AFXWIN_H__ beN(7jo  
#error include 'stdafx.h' before including this file for PCH 1`;,_>8  
#endif 5*he  
#include "resource.h" // main symbols ecjjCt2S  
class CHookApp : public CWinApp 9N?BWv }  
{ DQ a0S7I  
 public:  a1p}y2  
  CHookApp(); {8YNmxF#  
  // Overrides <l,Kg 'v  
  // ClassWizard generated virtual function overrides E$w2S Q  
  //{{AFX_VIRTUAL(CHookApp) pjI< cQ&  
 public: Fo0dz  
  virtual BOOL InitInstance(); /6$8djw  
  virtual int ExitInstance(); `!t+sX- n  
  //}}AFX_VIRTUAL =@UgCu>=  
  //{{AFX_MSG(CHookApp) N8s2v W  
  // NOTE - the ClassWizard will add and remove member functions here. Oy,`tG0  
  // DO NOT EDIT what you see in these blocks of generated code ! JkiMrpkuk  
  //}}AFX_MSG ls<7Qe"a  
  DECLARE_MESSAGE_MAP() 'aFjyY?%  
}; j![;;  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 1E]|>)$  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); y_mD9bgW  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); u\,("2ZW9+  
BOOL InitHotkey(); y&$mN  
BOOL UnInit(); %#^)hX,+Q  
#endif Z6Owxqfht  
K:i{us`  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. mROXwzL  
#include "stdafx.h" _Coh11  
#include "hook.h" T<\!7 RnLc  
#include <windowsx.h> G31??L:<  
#ifdef _DEBUG _ zh>q4M  
#define new DEBUG_NEW .%iJin"  
#undef THIS_FILE ~qk5Mk4$  
static char THIS_FILE[] = __FILE__; ~sd+ch*  
#endif D8b~-#  
#define MAX_KEY 100 DV,rh83.ip  
#define CTRLBIT 0x04 |6mDooTy  
#define ALTBIT 0x02 @n-[bN  
#define SHIFTBIT 0x01 W)0y+H\% r  
#pragma data_seg("shareddata") kDrqV{_  
HHOOK hHook =NULL; m ^O9G?  
UINT nHookCount =0; WrS|$: 0  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey }.uB6&!:  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT U!0 Qf7D  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey g7-=kmr|V  
static int KeyCount =0; %Q0J$eC  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Bx>)i8P7i0  
#pragma data_seg() "HuV'  
HINSTANCE hins; !E0zj9 [ R  
void VerifyWindow(); -}h+hS50F  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) vw'`t6  
//{{AFX_MSG_MAP(CHookApp) ?-"%%#  
// NOTE - the ClassWizard will add and remove mapping macros here. n$ri:~s  
// DO NOT EDIT what you see in these blocks of generated code! (($"XOU  
//}}AFX_MSG_MAP -]uN16\ F  
END_MESSAGE_MAP() ?&H1C4   
T vEN0RV2  
CHookApp::CHookApp() (Nky?*  
{ +:s]>R eDa  
 // TODO: add construction code here, '_~X(izc  
 // Place all significant initialization in InitInstance j70]2NgX  
} ZW]Q|vPh4U  
7,\Uk|  
CHookApp theApp; m}x&]">9  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) | CC(`<\R  
{ `@Q%}J  
 BOOL bProcessed=FALSE; ~B NLzt3%O  
 if(HC_ACTION==nCode) ?Q~6\xA  
 { !_EaF`oh(  
  if((lParam&0xc0000000)==0xc0000000){// Key up Mbt}G|;8H7  
   switch(wParam) I1H} 5 bf3  
   { >UP{= `  
    case VK_MENU: ed,w-;(n~  
     MaskBits&=~ALTBIT; >@2l/x8;  
     break; Dn 6k,nVh  
    case VK_CONTROL: `o9vE0^T<  
     MaskBits&=~CTRLBIT; W.xlS ZEB  
     break; p8>.Q/4  
    case VK_SHIFT: ?D].Za^km  
     MaskBits&=~SHIFTBIT; Pgy&/-u  
     break; +&W%]KEh  
    default: //judge the key and send message m"2KAq61  
     break; FyZa1%Tv@  
   } k \|[=  
   for(int index=0;index<MAX_KEY;index++){ H$:Z`CQt<  
    if(hCallWnd[index]==NULL) VtR?/+8X  
     continue; 5aF03+ko  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,1\nd{  
    { vZdn  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); CvCk#:@HM  
     bProcessed=TRUE; Cmq.V@  
    } AC=/BU3<yc  
   } RP 2MtP"M  
  } d(>7BV  
  else if((lParam&0xc000ffff)==1){ //Key down Ek [V A\G  
   switch(wParam) ?UXKy  
   { (l28,\Bel  
    case VK_MENU: C-;y#a)  
     MaskBits|=ALTBIT; p0KkPE">p4  
     break; -fl?G%:(!0  
    case VK_CONTROL: ?fog 34g  
     MaskBits|=CTRLBIT; &CvNNDgrJ  
     break; Xd_86q8o  
    case VK_SHIFT: VrF(0,-Z`3  
     MaskBits|=SHIFTBIT; avR4#bfc  
     break; }lzyl*.  
    default: //judge the key and send message {gE19J3  
     break; *t;'I -1w^  
   } s!\uR.  
   for(int index=0;index<MAX_KEY;index++) U _~lpu  
   { 73$^y)AvY  
    if(hCallWnd[index]==NULL) Ni$WI{e9  
     continue; YfC1.8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) P@Wi^svj  
    { UTEUVcJ\  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); `.z;.&x  
     bProcessed=TRUE; rp sq.n   
    } 8&6h()  
   } S~\i"A)4  
  } 360V  
  if(!bProcessed){ O a_2J#~$  
   for(int index=0;index<MAX_KEY;index++){ kL.JrbM"  
    if(hCallWnd[index]==NULL) z6)SaSYE  
     continue; &qki NS  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 6V=69}  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Q 'R@'W9  
   } })Og sBk  
  } K~A$>0c  
 } "5mdq-h(  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); eRC /Pr  
} VGoD2,(b^  
#>-_z  
BOOL InitHotkey() A KO#$OJE  
{ n*6b*fl  
 if(hHook!=NULL){ \UI7H1XDH  
  nHookCount++; ] X,C9  
  return TRUE; }/ 6Q3B  
 } ]HP aM  
 else 1FU(j*~:  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 0>Y3>vwSl  
  if(hHook!=NULL) &pS <4  
   nHookCount++; uBLI!N-G  
  return (hHook!=NULL); nB?$W4  
} B\a-Q,Wf  
BOOL UnInit() 4,m aA  
{ <4z |"(  
 if(nHookCount>1){ t\nYUL-H  
  nHookCount--; ?Kw~O"L8  
  return TRUE; B./Lp_QK  
 } 'AN3{  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Hm|8ydNs  
 if(unhooked==TRUE){ 0c4H2RW  
  nHookCount=0; i]8HzKuiW  
  hHook=NULL; Rh-e C6P  
 } f&glY`s#  
 return unhooked; `;-K/)/x  
} "?|sC{'C4j  
+0mU)4n/  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) A-\OB Nh  
{ nwh7DU i  
 BOOL bAdded=FALSE; ?yfk d:WD  
 for(int index=0;index<MAX_KEY;index++){ gF;i3OJg  
  if(hCallWnd[index]==0){ n7`R+4/s  
   hCallWnd[index]=hWnd; (tV/.x*G  
   HotKey[index]=cKey; g$s"x r`:  
   HotKeyMask[index]=cMask; 5" <7  
   bAdded=TRUE; u1F@VV{  
   KeyCount++; Jg=[!j0(  
   break; q"OvuHBSOn  
  } z=>U>  
 } <A +VS  
 return bAdded; R]e?<,"X  
} c%_I|h<?iT  
UD`bK a`E  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) RiC1lCE  
{ LutP&Ebt8  
 BOOL bRemoved=FALSE; "ewSh<t  
 for(int index=0;index<MAX_KEY;index++){ Fyy)665x/  
  if(hCallWnd[index]==hWnd){ A+*M<W  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ d@~Hp?  
    hCallWnd[index]=NULL; _,:gSDW|  
    HotKey[index]=0; VSa\X~  
    HotKeyMask[index]=0; ?sV0T)uk  
    bRemoved=TRUE; )%lPa|7s  
    KeyCount--; [V_Z9-f*  
    break; bhaIi>W~G  
   } T!C39T  
  } X(Gp3lG  
 } }p 0 \  
 return bRemoved; 6('2.^8  
} xMNUy B{?  
_oK*1#Rm8  
void VerifyWindow() <U(wLG'XS  
{ iIFM 5CT  
 for(int i=0;i<MAX_KEY;i++){ .$5QM&  
  if(hCallWnd!=NULL){ Coz\fL  
   if(!IsWindow(hCallWnd)){ ) -x0xY  
    hCallWnd=NULL; f0+)%gO{  
    HotKey=0; &GF@9BXI3  
    HotKeyMask=0; zi l^^wT0J  
    KeyCount--; hw/ :  
   } ]cvP !  
  }  }t}y  
 }  nen(  
} EYNi`  
NO5\|.,Z  
BOOL CHookApp::InitInstance() -0rc4<};h  
{ +~b@W{  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); M:6Yy@#T.  
 hins=AfxGetInstanceHandle(); tQ=P.14>:  
 InitHotkey(); (D5 dN\  
 return CWinApp::InitInstance(); 8."B  
} rw(EI,G  
aMdWT4  
int CHookApp::ExitInstance() : p# 5nYi  
{ 'jAX&7G`  
 VerifyWindow(); qKu/~0a/  
 UnInit(); JB.f7-  
 return CWinApp::ExitInstance(); M?mPi 3  
} Kx,#Wg{H  
!Au'WJfE  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file [?z`XY_-  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ~JhH ,E  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ASA ]7qyO  
#if _MSC_VER > 1000 F uYjrzmx  
#pragma once ~n9x ,  
#endif // _MSC_VER > 1000 Aw#@}TGT  
c'#w 8 V  
class CCaptureDlg : public CDialog }ZaZPB/_}P  
{ /BEE.`6yI5  
 // Construction -JgN$Sf  
 public: [XK^3pT_  
  BOOL bTray; L-. +yNX)  
  BOOL bRegistered; r6_g/7.-  
  BOOL RegisterHotkey(); -\=s+n_ZP?  
  UCHAR cKey; F/33# U  
  UCHAR cMask; <k59Ni9  
  void DeleteIcon(); )Iu0MN&  
  void AddIcon();  !4Q0   
  UINT nCount; kucH=96  
  void SaveBmp(); r{oRN  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor JmlMfMpXMs  
  // Dialog Data /j%(Z/RM  
  //{{AFX_DATA(CCaptureDlg) 9R$0[HbI3  
  enum { IDD = IDD_CAPTURE_DIALOG }; hO8~Rg   
  CComboBox m_Key; haNi [|  
  BOOL m_bControl; q|N,?f9  
  BOOL m_bAlt; ~4-:;8a  
  BOOL m_bShift; C8dC_9  
  CString m_Path; g"b{M  
  CString m_Number; cX~J6vNy5  
  //}}AFX_DATA a6Zg~>vX  
  // ClassWizard generated virtual function overrides j _]#Ew\q  
  //{{AFX_VIRTUAL(CCaptureDlg) r xlKoa  
 public: T,G38  
  virtual BOOL PreTranslateMessage(MSG* pMsg); )>-94xx|  
 protected: D1G9^7:^E  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support wz[Xay9jW  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); rnNB!T   
  //}}AFX_VIRTUAL :{7gZ+*  
  // Implementation ?rauhTVnJ  
 protected: @J~hi\&`  
  HICON m_hIcon; LR`]C]  
  // Generated message map functions dV/ ^@[  
  //{{AFX_MSG(CCaptureDlg) C[X2]zr  
  virtual BOOL OnInitDialog(); M%{,?a0V  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); U+[ p>iP  
  afx_msg void OnPaint(); nC6 ;:uM  
  afx_msg HCURSOR OnQueryDragIcon(); wlC7;u  
  virtual void OnCancel(); 8&q[jxI@8  
  afx_msg void OnAbout(); <PMQ$s>KK  
  afx_msg void OnBrowse(); fX:=_c   
  afx_msg void OnChange(); Pi/V3D) B  
 //}}AFX_MSG >~+qU&'2  
 DECLARE_MESSAGE_MAP() uv#."_Va  
}; cmcR @zv  
#endif 58]C``u@Y  
OV>JmYe1{/  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ;*+wg5|  
#include "stdafx.h" 5EX Ghc'  
#include "Capture.h" 4CH/~b1 (  
#include "CaptureDlg.h" .:wo ARW!  
#include <windowsx.h> W)~}o<a)[  
#pragma comment(lib,"hook.lib") @1c[<3xJ T  
#ifdef _DEBUG m7 $t$/g  
#define new DEBUG_NEW Gf<f#.5y ,  
#undef THIS_FILE eVRPjVzQ'Q  
static char THIS_FILE[] = __FILE__; 9_Ws8nE  
#endif ,S V34+(  
#define IDM_SHELL WM_USER+1 FTJvkcc?m  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ]K0G!TR<  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); BmhIKXE{*  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; i:/Ws1=q  
class CAboutDlg : public CDialog q+ZN$4m  
{ hBRcI0R  
 public: fk5$z0/  
  CAboutDlg(); ~~iFs ,9  
  // Dialog Data pu OAt  
  //{{AFX_DATA(CAboutDlg) a[ Y\5Ojm  
  enum { IDD = IDD_ABOUTBOX }; hI6Tp>b*~  
  //}}AFX_DATA Z%4w{T+[  
  // ClassWizard generated virtual function overrides BJ*8mKi h  
  //{{AFX_VIRTUAL(CAboutDlg) 1`q>*S](  
 protected: >{1 i8 b@  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support SoJ=[5W  
  //}}AFX_VIRTUAL (8Inf_59  
  // Implementation &@U)  
 protected: -]~KQvIH!  
  //{{AFX_MSG(CAboutDlg) N+nv#]{  
  //}}AFX_MSG VRQD  
  DECLARE_MESSAGE_MAP() hVGK%HCz&  
}; c,L{Qv"n{  
Ljs4^vy <J  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) v!WkPvU  
{ _C4N6YdU  
 //{{AFX_DATA_INIT(CAboutDlg) |!6<L_31%  
 //}}AFX_DATA_INIT .~AQxsGH  
} QLLMSa+! \  
T*1`MIkv  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) (k$KUP  
{ o,yZ1"  
 CDialog::DoDataExchange(pDX); =yCz!vc  
 //{{AFX_DATA_MAP(CAboutDlg) ]!'}{[1}  
 //}}AFX_DATA_MAP 0\KDa$ '1k  
} v/G)E_  
BenUyv1d  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) o |"iW" +  
 //{{AFX_MSG_MAP(CAboutDlg) 2t}^8  
 // No message handlers P.Gmj;  
 //}}AFX_MSG_MAP g;-6Hg'  
END_MESSAGE_MAP() w:3CWF4q]  
phP%  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) =IEei{  
: CDialog(CCaptureDlg::IDD, pParent) XGcl9FaO}  
{ Mh@RO|F  
 //{{AFX_DATA_INIT(CCaptureDlg) LXq0hI  
  m_bControl = FALSE; S4C4_*~Vd  
  m_bAlt = FALSE; njGZ#{"eC  
  m_bShift = FALSE; q]rqFP0C  
  m_Path = _T("c:\\"); e13' dCG  
  m_Number = _T("0 picture captured."); 78h!D[6  
  nCount=0; %pUA$oUt  
  bRegistered=FALSE; J`'wprSBb  
  bTray=FALSE; h=o%\F4  
 //}}AFX_DATA_INIT #q9cjEd_7  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Mh"vH0\Lj  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); XtftG7r9S  
} >k9W+mk  
j|w_BO 9  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) L IN$Y  
{ \F8 :6-  
 CDialog::DoDataExchange(pDX); q c DJ  
 //{{AFX_DATA_MAP(CCaptureDlg) :Oh*Q(>  
  DDX_Control(pDX, IDC_KEY, m_Key); (X/dP ~  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 2*pNIc  
  DDX_Check(pDX, IDC_ALT, m_bAlt); *}RV)0mif  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); N?l  
  DDX_Text(pDX, IDC_PATH, m_Path); b~Un=-@5a  
  DDX_Text(pDX, IDC_NUMBER, m_Number); qk_YFR?R  
 //}}AFX_DATA_MAP ['_W <  
}  CT[CM+  
H$!sK  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) /L; c -^  
//{{AFX_MSG_MAP(CCaptureDlg) 'q7&MM'oS^  
 ON_WM_SYSCOMMAND() hwi$:[  
 ON_WM_PAINT() zOn% \  
 ON_WM_QUERYDRAGICON() 1qE*M7_:E>  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) V7)<MY  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) bOdQ+Y6  
 ON_BN_CLICKED(ID_CHANGE, OnChange) HSlAm&Y\  
//}}AFX_MSG_MAP I;UCKoFT  
END_MESSAGE_MAP() I'c rH/z9  
H]PEE!C;xC  
BOOL CCaptureDlg::OnInitDialog() 4O '%$6KR(  
{ ,jJbQIu#  
 CDialog::OnInitDialog(); WVdF/H  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); @XN*H- |  
 ASSERT(IDM_ABOUTBOX < 0xF000); (dHil#l  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 4Ixu%  
 if (pSysMenu != NULL) h: Hpz  
 { v{O(}@  
  CString strAboutMenu; &H:2TL!  
  strAboutMenu.LoadString(IDS_ABOUTBOX); k{E!X  
  if (!strAboutMenu.IsEmpty()) DgGG*OXY  
  { EeDK ^W8N  
   pSysMenu->AppendMenu(MF_SEPARATOR); gT#hF]c:  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); _Eus7  
  } xi}3)5  
 } OY,iz  
 SetIcon(m_hIcon, TRUE); // Set big icon |*JMCI@Mz  
 SetIcon(m_hIcon, FALSE); // Set small icon GEJy?$9   
 m_Key.SetCurSel(0);  ;GZ/V;S  
 RegisterHotkey();  Fm`c  
 CMenu* pMenu=GetSystemMenu(FALSE); !BEl6h  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ;6tGRh$b  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); zdgSqv  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); g;\_MbfP  
 return TRUE; // return TRUE unless you set the focus to a control \!df)qdu  
} H&=fD` Xq  
g&fq)d  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) <4RP:2#  
{ @  Br?  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) c+.?+g  
 { Dz<vIMLF{  
  CAboutDlg dlgAbout; Q)93 +1]  
  dlgAbout.DoModal(); [z r2\(  
 } N(Xg#m   
 else kA{eT  
 { E=RX^ 3+}  
  CDialog::OnSysCommand(nID, lParam); KCi0v  
 } j7 \y1$w  
} nrJW.F]S8[  
EzGO/uZ]  
void CCaptureDlg::OnPaint() *4O9W8Qz  
{ yBnUz"  
 if (IsIconic()) ^wMZG'/  
 { x2Dg92  
  CPaintDC dc(this); // device context for painting B; r` 1 G  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); zTW)SX_O  
  // Center icon in client rectangle Qkx}A7sK  
  int cxIcon = GetSystemMetrics(SM_CXICON); bxvpj  
  int cyIcon = GetSystemMetrics(SM_CYICON); >36>{b<'$*  
  CRect rect; ?^!: Lw  
  GetClientRect(&rect); WNo<0|X  
  int x = (rect.Width() - cxIcon + 1) / 2; sO 0j!;N  
  int y = (rect.Height() - cyIcon + 1) / 2; '=cAdja  
  // Draw the icon !xz{X?  
  dc.DrawIcon(x, y, m_hIcon); Y%#r&de  
 } Cd'K~Ch3  
 else b&I{?'"%8  
 { mM\jU5P:^  
  CDialog::OnPaint(); hDD]Kc;G^1  
 } %%^by  
} llRQxk  
3R`eddenF  
HCURSOR CCaptureDlg::OnQueryDragIcon() y/OPN<=*  
{ }= (|3 \v  
 return (HCURSOR) m_hIcon; \>)#cEX5  
} /YD2F  
#GIjU1-  
void CCaptureDlg::OnCancel() )|IMhB+4  
{ Tu7sA.73k  
 if(bTray) -(l/.yE{X  
  DeleteIcon(); p[:E$#W~;  
  CDialog::OnCancel(); {/q4W; D  
} G&dz<f  
mE"},ksg  
void CCaptureDlg::OnAbout() k_](u91  
{ Gp}}M Gk  
 CAboutDlg dlg; z1m$8-4  
 dlg.DoModal(); iU"{8K,  
} epQdj=h  
$uCY\ xqZ  
void CCaptureDlg::OnBrowse() `m=u2kxY  
{ @%4tWE  
 CString str; ,]Q i/m  
 BROWSEINFO bi; 2PG= T/  
 char name[MAX_PATH]; ]_y0wLq  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); xOBzT&  
 bi.hwndOwner=GetSafeHwnd(); TY]-L1$  
 bi.pszDisplayName=name; ),&tF_z:  
 bi.lpszTitle="Select folder"; 0/,Dy2h  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ??h4qJ  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); WQ)vu&;  
 if(idl==NULL) &v.Nj9{zi  
  return; q+cx.Rc#  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); r>;6>ZMe  
 str.ReleaseBuffer(); ,n/^;. _1  
 m_Path=str; BiCC72oig  
 if(str.GetAt(str.GetLength()-1)!='\\') kqt.?iJw  
  m_Path+="\\"; YZQF*fj  
 UpdateData(FALSE); ]hjA,p@Q  
} X'.*I])  
*k<{nj@y  
void CCaptureDlg::SaveBmp() 2; ~jKR[~  
{ (sL!nRw  
 CDC dc; ^^{7`X u  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); * $v`5rP  
 CBitmap bm; tP0!TkTo9  
 int Width=GetSystemMetrics(SM_CXSCREEN); hp!. P1b  
 int Height=GetSystemMetrics(SM_CYSCREEN); ]97`=,OUg  
 bm.CreateCompatibleBitmap(&dc,Width,Height); @V71%D8{  
 CDC tdc; #/2W RN1L  
 tdc.CreateCompatibleDC(&dc); XS`=8FQ  
 CBitmap*pOld=tdc.SelectObject(&bm); $p~X"f?0  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); {p)=#Jd`.P  
 tdc.SelectObject(pOld); 2y@y<38  
 BITMAP btm; N]7#Q.(~  
 bm.GetBitmap(&btm); }8)iFP&"  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; +nm?+ F  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); \p{$9e;8yT  
 BITMAPINFOHEADER bih; ^>tqg^  
 bih.biBitCount=btm.bmBitsPixel; boWaH}?0'  
 bih.biClrImportant=0; ~pve;(e=  
 bih.biClrUsed=0; 5_E,x  
 bih.biCompression=0; ,'^^OLez  
 bih.biHeight=btm.bmHeight; j6r.HYX!  
 bih.biPlanes=1; I>(-&YbC  
 bih.biSize=sizeof(BITMAPINFOHEADER); Lk:Sju  
 bih.biSizeImage=size; v&}^8j  
 bih.biWidth=btm.bmWidth; ,<,#zG[.  
 bih.biXPelsPerMeter=0; Yb=Z `)  
 bih.biYPelsPerMeter=0; .jvRUD8A7  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); m5\/7 VC  
 static int filecount=0; :+$/B N:iO  
 CString name; :9f/d;Mo3  
 name.Format("pict%04d.bmp",filecount++); ?*: mR|=  
 name=m_Path+name; D<UX^hU   
 BITMAPFILEHEADER bfh; O [v(kH'  
 bfh.bfReserved1=bfh.bfReserved2=0; ;@ lC08SE  
 bfh.bfType=((WORD)('M'<< 8)|'B'); I%gDqfdL  
 bfh.bfSize=54+size; GZk{tTv  
 bfh.bfOffBits=54; qTi%].F"G  
 CFile bf; SVj4K \F  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ @o4n!Ip2x/  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 2:tO"   
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ,BuEX#ZaBl  
  bf.WriteHuge(lpData,size); $<v{$UOh  
  bf.Close(); $5S/~8g(  
  nCount++; 8*m=U@5]  
 } x9B5@2J1  
 GlobalFreePtr(lpData); J4>k9~q  
 if(nCount==1) iIO_d4Z  
  m_Number.Format("%d picture captured.",nCount); . Q$/\E  
 else gRQV)8uh  
  m_Number.Format("%d pictures captured.",nCount); ylVBK{w9  
  UpdateData(FALSE); =VPJ m\*V  
} SC/V3f W,  
l>iE1`iL<  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) #oQDt'  
{ XWNDpL`j5  
 if(pMsg -> message == WM_KEYDOWN) } D0Y8  
 { <Q|(dFr`v  
  if(pMsg -> wParam == VK_ESCAPE) ac< hz0   
   return TRUE; fqQ(EVpQ  
  if(pMsg -> wParam == VK_RETURN) &<\i37y  
   return TRUE; V1!;Hvm]+  
 } c</u]TD  
 return CDialog::PreTranslateMessage(pMsg); 'X{J~fEI!  
} "j] r   
O0cKmh6=  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) t) h{ w"v  
{ BkcA_a:W  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ds|L'7  
  SaveBmp(); <|R`N)AV;  
  return FALSE; ~n )<L7  
} zv[pfD7a  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ +4--Dl?  
 CMenu pop; MTUJsH\  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); /By`FW Y  
 CMenu*pMenu=pop.GetSubMenu(0); R<FW?z*  
 pMenu->SetDefaultItem(ID_EXITICON); +Oa+G.;)o4  
 CPoint pt; NP< {WL#  
 GetCursorPos(&pt); l7M![Ur  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 4!^flKZQ  
 if(id==ID_EXITICON) oNK-^N?-T  
  DeleteIcon(); T3#KuiwU9  
 else if(id==ID_EXIT) "{Jq6):mp  
  OnCancel();  ZXL  
 return FALSE; )mvD2]fK  
} Tyk\l>S  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ]<B@g($  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) * M,'F^E2  
 AddIcon(); Q\k|pg?  
 return res; p:@JCsH=  
} #V:28[  
QXg9ah~  
void CCaptureDlg::AddIcon() >;M?f!  
{ 9Vh>ty1|_  
 NOTIFYICONDATA data; QGI_aU  
 data.cbSize=sizeof(NOTIFYICONDATA); E,g5[s@  
 CString tip; r"aJ&~8::W  
 tip.LoadString(IDS_ICONTIP); Zwxu3R_  
 data.hIcon=GetIcon(0); q;0QI{:5v  
 data.hWnd=GetSafeHwnd(); ;*=MI/"N  
 strcpy(data.szTip,tip); ~w9.}   
 data.uCallbackMessage=IDM_SHELL; ZB@Bj>,b p  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; >ho$mvT  
 data.uID=98; yYri.n  
 Shell_NotifyIcon(NIM_ADD,&data); NiPa-yRh  
 ShowWindow(SW_HIDE); z=/xv},  
 bTray=TRUE; '<eeCe-  
} $Z!7@_Ys  
j\9v1O!T  
void CCaptureDlg::DeleteIcon() ="Sa>-d o,  
{ P6 & _q  
 NOTIFYICONDATA data; &hri4p/  
 data.cbSize=sizeof(NOTIFYICONDATA); uBXl ltU  
 data.hWnd=GetSafeHwnd(); *4oj' }  
 data.uID=98; tH\ aHU[  
 Shell_NotifyIcon(NIM_DELETE,&data); ;4] sP^+  
 ShowWindow(SW_SHOW); k~+(X|!5w  
 SetForegroundWindow(); }'.k  
 ShowWindow(SW_SHOWNORMAL); pcl '!8&7  
 bTray=FALSE; nm.~~h+8M  
} h..D1(M  
@ %}4R`S0  
void CCaptureDlg::OnChange() 1deNrmp%  
{ 4EtP|  
 RegisterHotkey(); K)!Nf.r$9  
} %e,X7W`'2  
VM[U&g<8n  
BOOL CCaptureDlg::RegisterHotkey() Dd:;8Xo  
{ ;[}<xw3):  
 UpdateData(); .o?"=Epo  
 UCHAR mask=0; \gE6KE<?p  
 UCHAR key=0; u(92y]3,  
 if(m_bControl) `+>'18F  
  mask|=4; A tU!8Z  
 if(m_bAlt) L@t}UC  
  mask|=2; n fU\l<  
 if(m_bShift) B}y`E <  
  mask|=1; ~=xS\@UY =  
  key=Key_Table[m_Key.GetCurSel()]; ?!$uMKyt  
 if(bRegistered){ > lg-j-pV  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); O?I~XM'S  
  bRegistered=FALSE; ">V.nao  
 } TtZ '~cGR  
 cMask=mask; ~ d!F|BH4  
 cKey=key; (&y~\t] H  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); )n&@`>vm  
 return bRegistered; Spt]<~  
} =5QP'Qt{O  
?-g/hXx;  
  四、小结 dLq)Z*r  
l0%qj(4`6&  
  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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