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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: }t"K(oamm  
  t*; KxQ+'?  
  一、实现方法 8KN 3|)  
QgKR=GR6  
  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: qO38vY){  
BQ<\[H;  
#pragma data_seg("shareddata") VxS3lR=  
HHOOK hHook =NULL; //钩子句柄 l]~9BPsR  
UINT nHookCount =0; //挂接的程序数目 n!AW9]  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ]%I\FefT  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 #>HY+ ;  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ~ o2Z5,H  
static int KeyCount =0; *iY:R  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 WVsj  
#pragma data_seg() =L@CZ"  
ev0>j4Q  
  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。 8ki3>"!A  
mR|5$1[b  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 4!OGNr$V@  
pEz^z9  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR WtKKdL  
cKey,UCHAR cMask) ?&zi{N  
{ r7].48D  
 BOOL bAdded=FALSE; 5!S#}=f=  
 for(int index=0;index<MAX_KEY;index++){ gvc/Z <Y  
  if(hCallWnd[index]==0){ +}1zw<  
   hCallWnd[index]=hWnd; mI{Fs|9h  
   HotKey[index]=cKey; JWaWOk(t=?  
   HotKeyMask[index]=cMask; '^C *%"I]  
   bAdded=TRUE; $j(d`@.DN~  
   KeyCount++; hr&&b3W3p  
   break;  DAiS|x  
  } <,0/BMz  
 } jjQDw=6  
 return bAdded; q9p31b3  
} TBrw ir  
//删除热键 oK-d58 sM  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) u{va2n/  
{ q]C_idK=  
 BOOL bRemoved=FALSE; k0N>J8y  
 for(int index=0;index<MAX_KEY;index++){ po'b((q  
  if(hCallWnd[index]==hWnd){ CshME\/  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 16]Ay&Kn!  
    hCallWnd[index]=NULL; lyFlJmi,r  
    HotKey[index]=0; ~OsLbz:  
    HotKeyMask[index]=0; V_ , `?>O  
    bRemoved=TRUE; iPV-w_HQ  
    KeyCount--; T iL.py,  
    break; d (x'\4(K  
   } U}DE9e{/!  
  } %FM26^  
 } fMUh\u3  
 return bRemoved; #"~\/sb   
} Wu<;QY($5  
@k)J i!7  
P7zUf  
  DLL中的钩子函数如下: u?fM.=/N  
Dq<DW2It>  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 0G-obHe0  
{ 9G2rVk  
 BOOL bProcessed=FALSE; o?m1  
 if(HC_ACTION==nCode) P qC#[0Qy  
 { +jZa A/  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ?< ^8,H  
   switch(wParam) d/F^ez  
   {  m,t{D, 2  
    case VK_MENU: WEX7=^k9  
     MaskBits&=~ALTBIT; 8f[ztT0`g  
     break; [ dVBsi  
    case VK_CONTROL: /YUW)?o!^N  
     MaskBits&=~CTRLBIT; kppi>!6  
     break; !4D?X\~"%  
    case VK_SHIFT: _b/zBFa%  
     MaskBits&=~SHIFTBIT; Jnd_cJ]a  
     break; {4A,&pR  
    default: //judge the key and send message gED|2%BXb  
     break; G/FDD{y  
   } uq-`1m }  
   for(int index=0;index<MAX_KEY;index++){ CJCxL\  
    if(hCallWnd[index]==NULL) `JDZR:bMaT  
     continue; ZiQ<SSo:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ?!jJxhK<h  
    { YkMFU'?[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); IO9|o!&>  
     bProcessed=TRUE; :L+ xEL  
    } Rc{R^5B  
   } D iOd!8Y  
  } GVA%iE.  
  else if((lParam&0xc000ffff)==1){ //有键按下 z9OpMA  
   switch(wParam) w' J`$=  
   { !ry+{v+A  
    case VK_MENU: p&V64L:V  
     MaskBits|=ALTBIT; 4G' E< ab  
     break; \b $pH  
    case VK_CONTROL: Ssz;d&93  
     MaskBits|=CTRLBIT; %L]sQq,  
     break; YaSBIq{z  
    case VK_SHIFT: bo90;7EK8  
     MaskBits|=SHIFTBIT; #_S]\=N(  
     break; 6'N_bNW  
    default: //judge the key and send message  QtG6v<A  
     break; ps:`rVQ7  
   } `?R{sNr.  
   for(int index=0;index<MAX_KEY;index++){ _*?qOmf=  
    if(hCallWnd[index]==NULL) d7G@Z|R3p  
     continue; #k)z5vZ$h  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 2jC:uk  
    { ebJTrh<{  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ezL1,GT  
     bProcessed=TRUE; &dWGa+e  
    } ttJ'6lGXh  
   } hx;kNcPbI  
  } XC~"T6F  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 gl`J(  
   for(int index=0;index<MAX_KEY;index++){ o$;&q *  
    if(hCallWnd[index]==NULL) 3{~(_  
     continue; Spx%`O<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) r9N?z2X  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Cj4Y, N  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 fU ;H  
   } c CDT27 @  
  } CP; <B1  
 } WHv6E!^\_  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); @{fwM;me]P  
} #[x*0K-h  
0{ B<A^Bf  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: j2IK\~W?-  
SE'|||B  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); i}C%8} %  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); !e<2o2~.  
z8"1*V  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: ReM]I<WuY  
?t6wozib2  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) {*hvzS{1d  
{ tF-l=ph}`  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) A'~mJO/   
 { [o(!/38"@=  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 4XVwi<)  
  SaveBmp(); 9#hp]0S6  
  return FALSE; y0T#Qq  
 } 65O 8?I  
 …… //其它处理及默认处理 tCO?<QBE  
} 1Dhe! n#  
VK*`&D<P  
'a JE+  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 c;"e&tW  
\MmOI<Hd-  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 eHs38X  
x"C7NW[$  
  二、编程步骤 R+K|K2"  
[QQM/?  
  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"; _oG%bNM  
hg0{x/Dgny  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; x`C"Z7t  
_6h.<BR  
  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; { ?jXPf  
]R}(CaT1  
  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; 4[kyzz x  
N;-%:nC  
  5、 添加代码,编译运行程序。 BxV>s+o&]  
uK(]@H7~!c  
三、程序代码 p9 ,[kb  
5RWqHPw+  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL cH5  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Owu?ND  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ nu1XT 1q1  
#if _MSC_VER > 1000 oGI'a:iff  
#pragma once z^tzP~nI  
#endif // _MSC_VER > 1000 acke q#  
#ifndef __AFXWIN_H__ P`Now7! GW  
#error include 'stdafx.h' before including this file for PCH )i:*r8*~  
#endif O#[bNLV  
#include "resource.h" // main symbols UNiK6h_%  
class CHookApp : public CWinApp :5j+^/   
{ ZQKo ]Kdr  
 public: pT~3< ,  
  CHookApp(); H}G 9gi  
  // Overrides :8/ 6dx@Y(  
  // ClassWizard generated virtual function overrides (=WYi~2v  
  //{{AFX_VIRTUAL(CHookApp) F|m &n&  
 public: YCb|eS^u  
  virtual BOOL InitInstance(); Z]DZ:dF  
  virtual int ExitInstance(); vuY X0&  
  //}}AFX_VIRTUAL }{@y]DcdM4  
  //{{AFX_MSG(CHookApp) ?<N} Xh  
  // NOTE - the ClassWizard will add and remove member functions here. I2RXw  
  // DO NOT EDIT what you see in these blocks of generated code ! pRE^; 4}z  
  //}}AFX_MSG ^`SEmYb;  
  DECLARE_MESSAGE_MAP() }s'=w]m  
}; GLZ*5kw  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); NhNd+SCZ@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); VKYljY0#  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); b|Ge#o  
BOOL InitHotkey(); sk 8DW  
BOOL UnInit(); $")Gd@aR  
#endif NV(jp'i~  
I;wxgWOP  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. k}nGgd6XD  
#include "stdafx.h" x_<#28H!  
#include "hook.h" `~VL&o1>  
#include <windowsx.h> v9 /37AU  
#ifdef _DEBUG .L%pWRxA[  
#define new DEBUG_NEW ,38M6yD  
#undef THIS_FILE 3$P  
static char THIS_FILE[] = __FILE__; }TZM@{;  
#endif gk?H@b*  
#define MAX_KEY 100 80g}<Lwc  
#define CTRLBIT 0x04 o(?9vU  
#define ALTBIT 0x02 8mdVh\i!Kf  
#define SHIFTBIT 0x01 Ue Z(@6_:  
#pragma data_seg("shareddata") }dMX1e1h8  
HHOOK hHook =NULL; r 20!   
UINT nHookCount =0; jxm#4  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey :~W(#T,$E  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT [9 :9<#?o^  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey z ULH gG  
static int KeyCount =0; PcZ<JJ16F$  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift |unvDXx-  
#pragma data_seg() ,/V~T<FI  
HINSTANCE hins; pnx^a}|px  
void VerifyWindow(); tQT<1Q02i  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) baTd;`Pn  
//{{AFX_MSG_MAP(CHookApp) lg )xQV  
// NOTE - the ClassWizard will add and remove mapping macros here. WEG!;XZ  
// DO NOT EDIT what you see in these blocks of generated code! UfO='&U^  
//}}AFX_MSG_MAP &#u\@Qze  
END_MESSAGE_MAP() ALO/{:l(  
_D{FQRU<YD  
CHookApp::CHookApp() t(PA+~sIp  
{ }#E]efjs  
 // TODO: add construction code here, A-L)2.M  
 // Place all significant initialization in InitInstance | ~>7_:  
} lsj9^z7  
!@ P{s'<:  
CHookApp theApp; FxK!h.C.  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 'ta&qp  
{ +T*? ?OW@  
 BOOL bProcessed=FALSE; jp~Tlomp  
 if(HC_ACTION==nCode) Syl9j]  
 { |=VWE>g  
  if((lParam&0xc0000000)==0xc0000000){// Key up Df2$2VU  
   switch(wParam) ^e_uprZWm  
   { QALr   
    case VK_MENU: @J6r;4|&  
     MaskBits&=~ALTBIT; z.)*/HGJm  
     break; xqlnHf<G  
    case VK_CONTROL: ]xb2W~  
     MaskBits&=~CTRLBIT; e~># M $  
     break; ~X<$ l+5  
    case VK_SHIFT: 7tJ#0to  
     MaskBits&=~SHIFTBIT; KdZ=g ZSH  
     break; G eB-4img  
    default: //judge the key and send message KX!/n`2u  
     break; (Lj*FXmz  
   } ^j pQfDe6  
   for(int index=0;index<MAX_KEY;index++){ iDgc$'%?  
    if(hCallWnd[index]==NULL) -R];tpddR5  
     continue; G i(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) KC9VQeSc  
    { Wq1OYZ,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ~@<o-|#  
     bProcessed=TRUE; wpQp1){%Q  
    } ?=_w5D.3J  
   } kDRxu!/  
  } @_c&lToj_  
  else if((lParam&0xc000ffff)==1){ //Key down g.;2N9  
   switch(wParam) &F[N$6:v  
   { N(J#<;!yb  
    case VK_MENU: '?NMQ  
     MaskBits|=ALTBIT; , .=7{y~  
     break; 2p 7;v7)y  
    case VK_CONTROL: u9c^YCBM  
     MaskBits|=CTRLBIT; t(.vX  
     break; l`X?C~JhJ  
    case VK_SHIFT: r~,3  
     MaskBits|=SHIFTBIT; 9]G~i`QQ  
     break; vGJw/ij'X  
    default: //judge the key and send message E"/k"1@  
     break; ZtGk Md$  
   } 9 MQwc  
   for(int index=0;index<MAX_KEY;index++) |KPNl\%ID  
   { /Gb)BJk!  
    if(hCallWnd[index]==NULL) }LEasj  
     continue; Lew 2Z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 7N vRZ!  
    { ]*)l_mut7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); i"DyXIrk2  
     bProcessed=TRUE; td$RDtW[3  
    } C\{hN  
   } ^ rO}'~(  
  } pD~."fb  
  if(!bProcessed){ M[iWWCX  
   for(int index=0;index<MAX_KEY;index++){ mQU t 'j4  
    if(hCallWnd[index]==NULL) .]<iRf[\[  
     continue; Gcxz$.(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) M#8_Qbvfk  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); JH2-'  
   } ]D2 d=\  
  } fv* $=m  
 } p>T  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); |x _jpR  
} q!5`9u6  
@K#}nKN'  
BOOL InitHotkey() 6*|EB|%n  
{ { Rxb_9  
 if(hHook!=NULL){ 7fT_]H8  
  nHookCount++; 8r0;054  
  return TRUE; o9]!*Y!RA  
 } j/ARTaO1]"  
 else ~@}n}aV'!  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); n{m[ j+UG  
  if(hHook!=NULL) sVnpO$  
   nHookCount++; Eh9{n,5-  
  return (hHook!=NULL); l u{6  
} :2A-;P4  
BOOL UnInit() a`C2:Z23(#  
{ nx{X^oc8e  
 if(nHookCount>1){ rC/z8m3z  
  nHookCount--; oHV!>K_D  
  return TRUE; bQ0+Y?,+/  
 } 8KdcU [w]  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ;__k*<+{.  
 if(unhooked==TRUE){ k&u5`F  
  nHookCount=0; k$7Kz"  
  hHook=NULL; Ycxv=Et  
 } <fgf L9-  
 return unhooked; 1u }2}c|  
} uXG$YDKqC  
y;.5AvfD  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) $ 93j;  
{ A5ckosYyNA  
 BOOL bAdded=FALSE; /}d)g4\j  
 for(int index=0;index<MAX_KEY;index++){ a72L%oJ   
  if(hCallWnd[index]==0){ m'ZxmsFo  
   hCallWnd[index]=hWnd; ehMpo BL  
   HotKey[index]=cKey; 4/2@^\?i)  
   HotKeyMask[index]=cMask; h?->A#  
   bAdded=TRUE; G*zhy!P  
   KeyCount++; 2jP(D%n  
   break; IG:CWPU  
  } 9m%+6#|  
 } "1Y DT-I"  
 return bAdded; og*ti!Z  
} p%\&M bA  
eFQz G+/  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) H]{`q  
{ )@ .0ai  
 BOOL bRemoved=FALSE; OeQ~g-n  
 for(int index=0;index<MAX_KEY;index++){ j#H&~f  
  if(hCallWnd[index]==hWnd){ S09Xe_q  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ W#x~x|(c  
    hCallWnd[index]=NULL; HJe6h. P  
    HotKey[index]=0; Fa X3@Sd!  
    HotKeyMask[index]=0; ORIXcj]  
    bRemoved=TRUE; }ol<DV  
    KeyCount--; G98fBw  
    break; IfCa6g<&(  
   } 0A75)T=lQ  
  } Bthp_cSmLs  
 } ?y[i6yN9  
 return bRemoved; 4(8BWP~.y2  
} O<?.iF%  
7VfPS5se  
void VerifyWindow() U\"FYTC  
{ v dU)  
 for(int i=0;i<MAX_KEY;i++){ o fCN[u  
  if(hCallWnd!=NULL){ pEG!j ~  
   if(!IsWindow(hCallWnd)){ Tx$bg(  
    hCallWnd=NULL; ,@8*c0Y~<!  
    HotKey=0; W)odaab7  
    HotKeyMask=0; u&o<>d;)  
    KeyCount--; bI)%g  
   } )u=a+T  
  } /jn0Xh  
 } [Lid%2O3ZR  
} 9_%??@^>  
t8~isuiK  
BOOL CHookApp::InitInstance() 2t#[$2mg\0  
{ 6lQP+! EF  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); RJD(c#r$  
 hins=AfxGetInstanceHandle(); ooN?x31  
 InitHotkey(); >#5jO9  
 return CWinApp::InitInstance(); m*>gG{3;  
} }FkF1?C  
:-T[)Q+-3  
int CHookApp::ExitInstance() +,4u1`c|$  
{ ^ `[T0X  
 VerifyWindow(); 42PA?^xPw  
 UnInit(); U ~8, N[  
 return CWinApp::ExitInstance(); A+"'8%o9}  
} Es1T{<G|w  
*HQ>tvUh  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file edfb7prfTl  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) mf gUf  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ AK$i0Rn;pm  
#if _MSC_VER > 1000 S@WT;Q2Z  
#pragma once JuR x>F4  
#endif // _MSC_VER > 1000 `t]8 [P5  
Lr(My3vF8q  
class CCaptureDlg : public CDialog *V@t]d$=#  
{ %$+bO/f  
 // Construction 3s,a%GOk  
 public: FOSC#W9E  
  BOOL bTray; BvpUcICJ  
  BOOL bRegistered;  0gJ{fcI  
  BOOL RegisterHotkey(); ua%j}%G(  
  UCHAR cKey; M4L<u,\1s  
  UCHAR cMask; yOm#c>X  
  void DeleteIcon(); sbq:8P#  
  void AddIcon(); ?#/~ BZR!  
  UINT nCount; O _^Y*!  
  void SaveBmp(); I=4G+h5p  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor cg}lF9;d  
  // Dialog Data 6oq/\D$6~  
  //{{AFX_DATA(CCaptureDlg) >u?a#5R:m  
  enum { IDD = IDD_CAPTURE_DIALOG }; b}m@2DR'|m  
  CComboBox m_Key; VP6_}9:9   
  BOOL m_bControl; -b'/}zz  
  BOOL m_bAlt; H:`H4 S}  
  BOOL m_bShift; ?H21Ru>:*  
  CString m_Path; < *db%{  
  CString m_Number; f.ws\^v%  
  //}}AFX_DATA `Wp& 'X  
  // ClassWizard generated virtual function overrides aj$&~-/ R  
  //{{AFX_VIRTUAL(CCaptureDlg) bMN ]co  
 public: :}Z Y*ind  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ~Z$Ro/;l  
 protected: E.^F:$2  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ZE6W"pbjU  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); L=kETJ:g  
  //}}AFX_VIRTUAL $`"$ZI6[  
  // Implementation 8:"s3xaO3  
 protected: md /NMC \  
  HICON m_hIcon; uP2Wy3`V  
  // Generated message map functions KzLkT7,y+  
  //{{AFX_MSG(CCaptureDlg) qXB5wDJg  
  virtual BOOL OnInitDialog(); !+3nlG4cw  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 6@ =ipPCR  
  afx_msg void OnPaint(); *30T$_PiX|  
  afx_msg HCURSOR OnQueryDragIcon(); li%A?_/m<&  
  virtual void OnCancel(); D<Z]kR(  
  afx_msg void OnAbout(); #8a k=lL  
  afx_msg void OnBrowse(); s#)0- Zj  
  afx_msg void OnChange(); o(oD8Ni  
 //}}AFX_MSG Md>9Daa~  
 DECLARE_MESSAGE_MAP() XOPiwrg%p  
}; ]?0]K!7Ea  
#endif n<DZb`/uHZ  
@6{F4  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file eZmwF@  
#include "stdafx.h" kwrM3nq  
#include "Capture.h" x{$/|_  
#include "CaptureDlg.h" ffem7eQ  
#include <windowsx.h> [g$IN/o%  
#pragma comment(lib,"hook.lib") 3Hhu]5  
#ifdef _DEBUG kQO5sX$;  
#define new DEBUG_NEW v)LSH;<  
#undef THIS_FILE r/RX|M  
static char THIS_FILE[] = __FILE__; v=x)]<E" _  
#endif XiAflO  
#define IDM_SHELL WM_USER+1 lO8GnkLE  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); xgZ<. r  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); [ lE^0_+  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ]1|OQYG  
class CAboutDlg : public CDialog :VlMszy}B3  
{ E[Ao*  
 public: =wFl(Q6J  
  CAboutDlg(); #[sJKW  
  // Dialog Data ,? V YrL  
  //{{AFX_DATA(CAboutDlg) 8k?V&J `  
  enum { IDD = IDD_ABOUTBOX }; ;H"OZRQ  
  //}}AFX_DATA 4gn|zSe>^  
  // ClassWizard generated virtual function overrides O]Q8&(  
  //{{AFX_VIRTUAL(CAboutDlg) M~g@y$  
 protected: {R7m qzt  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ;rt\  
  //}}AFX_VIRTUAL Y|-:z@n6C  
  // Implementation |uM(A~?  
 protected: Fuo.8  
  //{{AFX_MSG(CAboutDlg) ,gIeQ!+vy  
  //}}AFX_MSG Xb1is\JB  
  DECLARE_MESSAGE_MAP() f:ep~5] G  
}; e J:#vX86  
{5JYu  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ) {4$oXQ  
{ jN!sL W  
 //{{AFX_DATA_INIT(CAboutDlg) ``Rg0o  
 //}}AFX_DATA_INIT ^2"w5F  
} %WtF\p  
x=V3_HI/}  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) >* ]B4Q  
{ a0hgF_O1  
 CDialog::DoDataExchange(pDX); Fhs/<w-  
 //{{AFX_DATA_MAP(CAboutDlg) _`xhP-,`S  
 //}}AFX_DATA_MAP s~g]`/h$r  
} U DHMNubB  
#kAk d-QY6  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ?)e6:T(  
 //{{AFX_MSG_MAP(CAboutDlg) 'o1lJ?~kH  
 // No message handlers z"V`8D  
 //}}AFX_MSG_MAP d@ tD0s  
END_MESSAGE_MAP() 1c:/c|shQ_  
/B5rWJ2AS  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) |i- S}M  
: CDialog(CCaptureDlg::IDD, pParent) 1N+ju"2R  
{ fP{IW`t}]  
 //{{AFX_DATA_INIT(CCaptureDlg) bl4I4RB  
  m_bControl = FALSE; $A>]lLo0  
  m_bAlt = FALSE; K(_8oB784  
  m_bShift = FALSE; k(_^Lq f-  
  m_Path = _T("c:\\"); }XRRM:B|)(  
  m_Number = _T("0 picture captured."); B'D~Q  
  nCount=0; zu``F]B  
  bRegistered=FALSE; +3?.Vb%jY  
  bTray=FALSE; @gm!D`YL  
 //}}AFX_DATA_INIT ^fti<Lw5  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 hIwqSKq9  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); n/+G^:~_  
} L EY k  
k<%y+v  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) (^^}Ke{J  
{ oC(.u?  
 CDialog::DoDataExchange(pDX); v8K4u)  
 //{{AFX_DATA_MAP(CCaptureDlg) X9#i!_*  
  DDX_Control(pDX, IDC_KEY, m_Key); *%2,= p  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ?P Mi#H  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 3q`Uq`t4mR  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 57:27d0y  
  DDX_Text(pDX, IDC_PATH, m_Path); T$tO[QR/  
  DDX_Text(pDX, IDC_NUMBER, m_Number); *TYOsD**9  
 //}}AFX_DATA_MAP 1#nY Z%  
} l!%V&HJV  
Ol*|J  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) =${ImMwj  
//{{AFX_MSG_MAP(CCaptureDlg) # 0/,teJ k  
 ON_WM_SYSCOMMAND() 6R!AIOD>  
 ON_WM_PAINT() MG74,D.f  
 ON_WM_QUERYDRAGICON() T@Th?  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) BU=Ta$#BZ  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) u$+nl~p[&  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 5h p)Z7  
//}}AFX_MSG_MAP JiRfLB  
END_MESSAGE_MAP() 1yjP`N  
DK(8Ml:k  
BOOL CCaptureDlg::OnInitDialog() `B7?F$J  
{ ZnD(RM  
 CDialog::OnInitDialog(); i{k v$ir!  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 1f0maN  
 ASSERT(IDM_ABOUTBOX < 0xF000); %DhLU~VX  
 CMenu* pSysMenu = GetSystemMenu(FALSE); tdn|mX#  
 if (pSysMenu != NULL) +=(@=PJ6  
 { iL3k8:x  
  CString strAboutMenu; T0K*!j}O  
  strAboutMenu.LoadString(IDS_ABOUTBOX); p.!p6ve){  
  if (!strAboutMenu.IsEmpty()) ivPX_#QI  
  { _6C,w`[[6  
   pSysMenu->AppendMenu(MF_SEPARATOR); T_~xDQ`v  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); CMHg]la  
  } p\r V6+  
 } W";Po)YC  
 SetIcon(m_hIcon, TRUE); // Set big icon WRN}>]NgQ  
 SetIcon(m_hIcon, FALSE); // Set small icon GD#W=O  
 m_Key.SetCurSel(0); `qa>6`\  
 RegisterHotkey(); {0Ej *%  
 CMenu* pMenu=GetSystemMenu(FALSE); )!d_Td\-  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); hr/|Fn+kA  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); _kQOax{c/  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); > `+lEob  
 return TRUE; // return TRUE unless you set the focus to a control qEnmms1  
} :47"c3J  
O\^D 6\ v  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) x!A5j $k0  
{ ;`FR1KIg  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) n$3w=9EX *  
 { 8PvO_Gz5  
  CAboutDlg dlgAbout; ~}s0~j~  
  dlgAbout.DoModal(); g (V_&Y  
 } wy?Hp*E  
 else @gihIysf  
 { -A1:S'aN-  
  CDialog::OnSysCommand(nID, lParam); o.>Yj)U  
 } =<z~OE'lV  
} BHZSc(-o  
I7jIA>ZZi  
void CCaptureDlg::OnPaint() 'jBtBFzP-  
{ Sigu p#.p  
 if (IsIconic()) .jRv8x b  
 { *+<H4.W H  
  CPaintDC dc(this); // device context for painting :c0 |w  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Kg#s<#h  
  // Center icon in client rectangle :w:ql/?X  
  int cxIcon = GetSystemMetrics(SM_CXICON); )iCg,?SSw=  
  int cyIcon = GetSystemMetrics(SM_CYICON); a}7P:e*u  
  CRect rect; r8[Ywn <u  
  GetClientRect(&rect); eHH9#Vrhc$  
  int x = (rect.Width() - cxIcon + 1) / 2; gO m%?sg  
  int y = (rect.Height() - cyIcon + 1) / 2; \`WAG>'l5  
  // Draw the icon n|!O .+\b  
  dc.DrawIcon(x, y, m_hIcon); T%1Kh'92  
 } H^8t/h  
 else |p":s3K"Hy  
 { ]d,#PF  
  CDialog::OnPaint(); R!7a;J}  
 } pOIfKd  
} P%Wl`NA P  
t}Kzh`  
HCURSOR CCaptureDlg::OnQueryDragIcon()  h]?[}&  
{ ((tWgSZ3  
 return (HCURSOR) m_hIcon; X$ 76#x  
} u %&4[zb  
~,reS:9RZ  
void CCaptureDlg::OnCancel() {aWfD XB1  
{ ~Ec@hz]js  
 if(bTray) tq5o  
  DeleteIcon(); Aq{7WA  
  CDialog::OnCancel(); a: [m;  
} ceNJXK  
 `/eh  
void CCaptureDlg::OnAbout() K<7 Db4H  
{ rYk   
 CAboutDlg dlg; ]=m0@JTbG  
 dlg.DoModal(); +ZeK,Y+Xy  
} 5c3&4,,eR  
"aeKrMgc6V  
void CCaptureDlg::OnBrowse() mS >I#?  
{ ?=\_U  
 CString str; v$bR&bCT  
 BROWSEINFO bi; T eBJ  
 char name[MAX_PATH]; S3_QOL  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); u^&,~n@n7  
 bi.hwndOwner=GetSafeHwnd(); 4L[-[{2  
 bi.pszDisplayName=name; Pna2IB+  
 bi.lpszTitle="Select folder"; Lcy>!3q3~  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; `jH0FJQ  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ?&r >`H E  
 if(idl==NULL) vA, tW,  
  return; "AMsBvzgo  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH));  B<?fD  
 str.ReleaseBuffer(); >?0f>I%\  
 m_Path=str; D_Cd^;b  
 if(str.GetAt(str.GetLength()-1)!='\\') X.<2]V7!  
  m_Path+="\\"; ' $X}'u  
 UpdateData(FALSE); @)m+b;  
}  Q-Rt  
)z2hyGX  
void CCaptureDlg::SaveBmp() [bJAh ` I  
{ {t&+abY  
 CDC dc; p&,2@(Q  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); WJ(E3bb  
 CBitmap bm; T1pMe{  
 int Width=GetSystemMetrics(SM_CXSCREEN); A49HYX-l  
 int Height=GetSystemMetrics(SM_CYSCREEN); }-ysP$  
 bm.CreateCompatibleBitmap(&dc,Width,Height); zj9aaZ}  
 CDC tdc; N^&T5cAC  
 tdc.CreateCompatibleDC(&dc); NuKx{y}P  
 CBitmap*pOld=tdc.SelectObject(&bm); OX/}j_8E^(  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); OPwO`pN  
 tdc.SelectObject(pOld); Oz_|pu  
 BITMAP btm; 3ZU<u;  
 bm.GetBitmap(&btm); &y=~:1&f  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; pM'AhzS  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ~`x<;Ts  
 BITMAPINFOHEADER bih; t= oTU,<  
 bih.biBitCount=btm.bmBitsPixel; gEQevy`T%c  
 bih.biClrImportant=0; Cn(0ID+3f  
 bih.biClrUsed=0; xT1{O`  
 bih.biCompression=0; p&ml$N9fd  
 bih.biHeight=btm.bmHeight; v_Y'o _  
 bih.biPlanes=1; j=,]b6(  
 bih.biSize=sizeof(BITMAPINFOHEADER); nH]F$'rtA  
 bih.biSizeImage=size; B#;yko  
 bih.biWidth=btm.bmWidth; _fQBXG2  
 bih.biXPelsPerMeter=0; ;'J{ylRQ  
 bih.biYPelsPerMeter=0; 9oA.!4q  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); XDi[Iyj  
 static int filecount=0; ZICcZG_y  
 CString name; {,rVA(I@  
 name.Format("pict%04d.bmp",filecount++); #s'  
 name=m_Path+name; ,l_n:H+"F  
 BITMAPFILEHEADER bfh; -KG3_kE  
 bfh.bfReserved1=bfh.bfReserved2=0;  a7UfRG  
 bfh.bfType=((WORD)('M'<< 8)|'B'); )q+9_KU q  
 bfh.bfSize=54+size; xkzC+ _A  
 bfh.bfOffBits=54; bbO1`b-  
 CFile bf; N/fH%AtM  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ t'0dyQ%u  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); `[5QouPV  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); sj?7}(s  
  bf.WriteHuge(lpData,size); &Kgl\;}  
  bf.Close(); Qv@Z#  
  nCount++; |%~sU,Y\(  
 } <e&*Tx<8  
 GlobalFreePtr(lpData); !xxu~j^T  
 if(nCount==1) v/yt C/WH"  
  m_Number.Format("%d picture captured.",nCount); ?=h{`Ci^ $  
 else i@M^9|Gh  
  m_Number.Format("%d pictures captured.",nCount); D>Qc/+  
  UpdateData(FALSE); ?"[h P=3J  
} I5J9,j  
 Gp/yr  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) q={\|j$X  
{ ]}&f<X  
 if(pMsg -> message == WM_KEYDOWN) $lMEZt8A  
 { r%/*,lLO  
  if(pMsg -> wParam == VK_ESCAPE) H]7;O M/g  
   return TRUE; Ya)s_Zr7  
  if(pMsg -> wParam == VK_RETURN) HjAQF?;V  
   return TRUE; L)o7~M  
 } g.d%z  
 return CDialog::PreTranslateMessage(pMsg); EO5k?k[*  
} d?/?VooU  
!~&vcz0>)9  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) R2af>R  
{ I bd na9z7  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ @ 0RB.-  
  SaveBmp(); zU9G: jH  
  return FALSE; kG7q4jFwP  
} Z) zWfv}  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Ge>%?\  
 CMenu pop; B|Rnh;B-  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 6h|@Bz/A  
 CMenu*pMenu=pop.GetSubMenu(0); r%g?.4o*b  
 pMenu->SetDefaultItem(ID_EXITICON); +0Rr5^8u  
 CPoint pt; 0/."R ;  
 GetCursorPos(&pt); xED`8PCfu  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 8@|rB3J  
 if(id==ID_EXITICON) }'KVi=qnHb  
  DeleteIcon(); VBIY[2zf  
 else if(id==ID_EXIT) x^| J-  
  OnCancel(); YEWHr>&Z  
 return FALSE; w-%H\+J  
} :_q   
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ~iZMV ?w  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) pCQB<6&1N  
 AddIcon(); =x4:jas  
 return res; bV#U&)|  
} "3*Chc  
y4HOKJxI  
void CCaptureDlg::AddIcon() D %`64R  
{ D/w4u;E@  
 NOTIFYICONDATA data; ? 5qo>W<7  
 data.cbSize=sizeof(NOTIFYICONDATA); RrkS!E[C  
 CString tip; -k p~p e*T  
 tip.LoadString(IDS_ICONTIP); ,))UQ7N  
 data.hIcon=GetIcon(0); {P_~_5o_  
 data.hWnd=GetSafeHwnd(); |yi3y `f  
 strcpy(data.szTip,tip); Ok+zUA[Wu  
 data.uCallbackMessage=IDM_SHELL; '|b {  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; q9RCXo>Y+1  
 data.uID=98; T{={uzQeJJ  
 Shell_NotifyIcon(NIM_ADD,&data); u":D{+wC |  
 ShowWindow(SW_HIDE); ^IxT.g  
 bTray=TRUE; B8^tIq  
} ,*2%6t`N?  
UlHRA[SCv  
void CCaptureDlg::DeleteIcon() zv]-(<B  
{ iAX\F`  
 NOTIFYICONDATA data; j w)Lofn  
 data.cbSize=sizeof(NOTIFYICONDATA); dUtxG ~9  
 data.hWnd=GetSafeHwnd(); Y WSo:)LY  
 data.uID=98; pCz;km  
 Shell_NotifyIcon(NIM_DELETE,&data); "msCiqF{z  
 ShowWindow(SW_SHOW); x=yU }lsV  
 SetForegroundWindow(); x-0IxWD%  
 ShowWindow(SW_SHOWNORMAL); <_ 02)6j  
 bTray=FALSE; J<Wz3}w6  
} EdA_Hf  
#dDsI]E )  
void CCaptureDlg::OnChange() ~(tZW  
{ K h9$  
 RegisterHotkey(); ,|_ewye  
} :".:Wd  
ObIi$uJX  
BOOL CCaptureDlg::RegisterHotkey() TR,,=3n  
{ w~EXO;L2  
 UpdateData(); J'4{+Q_pa  
 UCHAR mask=0; }(AUe5aw`G  
 UCHAR key=0; >wjWX{&?  
 if(m_bControl) aTs5^Kh')  
  mask|=4; x\XgQQ]-  
 if(m_bAlt) V#1_jxP)Q  
  mask|=2; X-! yi  
 if(m_bShift) ~1pJQ)!zlq  
  mask|=1; @5H1Ni5/o@  
  key=Key_Table[m_Key.GetCurSel()]; o$m64l  
 if(bRegistered){ br}.s@~  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 13.v5v,l  
  bRegistered=FALSE; WIXzxI<)  
 } y6'Fi(2yw  
 cMask=mask; H*3f8A&@s  
 cKey=key; VuwBnQ.2k  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); j?1\E9&4-Q  
 return bRegistered; !W/Og 5n  
} $Trkow%F]  
=1lKcA[z  
  四、小结 g/so3F%v .  
D5)qmu  
  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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