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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|Ipxk.)  
  7berkU0P  
  一、实现方法 Y4B< ]C4  
J|BZ{T}d  
  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: VF<C#I  
XN=Cq*3}  
#pragma data_seg("shareddata") 66+y@l1  
HHOOK hHook =NULL; //钩子句柄 t9Nu4yl  
UINT nHookCount =0; //挂接的程序数目 m*^|9*dIC  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 4JD 8w3u/  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 GqrOj++>  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey A|esVUo<3^  
static int KeyCount =0; 9IRvbE~2  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 1xkU;no  
#pragma data_seg() #1C~i}J1  
9C{\=?e;  
  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。 3koXM_4_{)  
3oCw(Ff  
  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: <XHS@|  
"n3i (sZ  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ;5.o;|w?!  
cKey,UCHAR cMask) 6!3Jr  
{ aumXidb S  
 BOOL bAdded=FALSE; o,sw[  
 for(int index=0;index<MAX_KEY;index++){ T"GuE[?a  
  if(hCallWnd[index]==0){ >Lo!8Hen  
   hCallWnd[index]=hWnd; dWI.t1`i  
   HotKey[index]=cKey; OZ$"P<X_"  
   HotKeyMask[index]=cMask; ]%y~cq  
   bAdded=TRUE; D-8>?`n\  
   KeyCount++; zTa>MzH1-;  
   break; 5w#*JK   
  } '%m0@5|hCD  
 } DJ9;{,gm  
 return bAdded; N+vU@)_lC  
} jbHk  
//删除热键 v^lR]9;  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ` tkd1M  
{ g1uqsqYt  
 BOOL bRemoved=FALSE; '1}rQqZ  
 for(int index=0;index<MAX_KEY;index++){ ; YaR|)B  
  if(hCallWnd[index]==hWnd){ }bv0~}G4  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 7 \ <4LX  
    hCallWnd[index]=NULL; Z`?<Ada  
    HotKey[index]=0; q-.e9eoc\  
    HotKeyMask[index]=0; !vQ!_|g1  
    bRemoved=TRUE; 1@ j>2>i  
    KeyCount--; I>27U<PX  
    break; >t"]gQHtx  
   } jj)9jU z  
  } 4pF U`g=  
 } [LonY49  
 return bRemoved; axY-Vj  
} ?[W(r$IaE  
LaZF=<w(  
k:4?3zJI  
  DLL中的钩子函数如下: bmAgB}Ior  
;!@\|E  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) t#y   
{ (/_Q r2KfC  
 BOOL bProcessed=FALSE; P#H#@:/3  
 if(HC_ACTION==nCode) @Y>3-,o,S  
 { +fhyw{  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 vII8>x%*  
   switch(wParam) RZfC ?  
   {  _^RN C)ol  
    case VK_MENU: >5Zp x8W  
     MaskBits&=~ALTBIT; ^gFjm~2I  
     break; 6,xoxNoPP3  
    case VK_CONTROL: g)'tr '  
     MaskBits&=~CTRLBIT; K.2M=Q  
     break; S iw9_c  
    case VK_SHIFT: We]X+>BlO  
     MaskBits&=~SHIFTBIT; 13Z6dhZu  
     break; ;f-|rC_"  
    default: //judge the key and send message  W4CI=94  
     break; $/C<^}A  
   } 71tMX[x  
   for(int index=0;index<MAX_KEY;index++){ ]tZ5XS  
    if(hCallWnd[index]==NULL) h6x+.}}  
     continue;  &1Fcwj  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) EGwY|+3  
    { 7atYWz~yG  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); .;tO;j |6  
     bProcessed=TRUE; uz4mHyS6  
    } 4C /8hsn  
   } q rbF@{  
  } hkgPC-  
  else if((lParam&0xc000ffff)==1){ //有键按下 +&\TdvNI4  
   switch(wParam) l@*/1O)v  
   { J'O`3!Oy/  
    case VK_MENU: [6S"iNiyKT  
     MaskBits|=ALTBIT; i,")U)b  
     break; K23_1-mbe  
    case VK_CONTROL: p8"(z@T  
     MaskBits|=CTRLBIT; "|DR"rr'j  
     break; eq/5$b(  
    case VK_SHIFT: [Pp#l*  
     MaskBits|=SHIFTBIT; !E_uQ?/w]Z  
     break; z K8#gif@  
    default: //judge the key and send message ~DZ;l/&Mz7  
     break; LO61J_J<  
   } &SN$D5U'  
   for(int index=0;index<MAX_KEY;index++){ (P#2Am$  
    if(hCallWnd[index]==NULL) o33{tUp'  
     continue; +lha^){  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) GIVs)~/Eq  
    { 8 (^2  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); >KY\Bx  
     bProcessed=TRUE; ! T,7  
    } TjI NxP-O  
   } N/?Ms rZw  
  } <Awx:lw.  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 xYu~}kMu  
   for(int index=0;index<MAX_KEY;index++){ Mty]LMK  
    if(hCallWnd[index]==NULL) _ z4rx  
     continue; /1li^</|p`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) }2c}y7B,_  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); oZCi_g 5i  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 gy =`cMS@  
   } $PS5xD~@  
  } |I\A0aa  
 } 3X!~*_i C  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Ee|+uQ981>  
} 3Xh&l[.  
}ZmdX^xB  
  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: H4:TYh  
6$6NVq  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ESrWRO f9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); X3m?zQbhv  
*Ra")(RnDK  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: n&C9f9S  
zRJy3/>  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 5ZKnxEW,(  
{ E+1j3Q;  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) "tj#P  
 { pWx3l5)R  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Zj7XmkL  
  SaveBmp(); ; %Da {  
  return FALSE; @E>^\!nH  
 } % 9D@W*Z  
 …… //其它处理及默认处理 /3TorB~Y  
} I@S<D"af  
xRY5[=97  
\QMSka>  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 S-/ #3  
blN1Q%m6  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 Qx,G3m[}  
.4Ny4CMHZ  
  二、编程步骤 o7T|w~F~R  
1 I+5  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; :> q?s  
.E}});l  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; aXJe"IT.u  
rka:.#!  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 2DC#PX)i  
3 #wj-  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; ; p_X7N  
l46F3C|  
  5、 添加代码,编译运行程序。 0/gcSW b  
;Pa(nUE@  
三、程序代码 *=7[Ip< X  
K?tk&0  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL /< :; ^B  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) "QF083$  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ;dFe >`~  
#if _MSC_VER > 1000 VxFy[rP  
#pragma once @ubz?5  
#endif // _MSC_VER > 1000 \fz j fZ1n  
#ifndef __AFXWIN_H__ Yq^y"rw  
#error include 'stdafx.h' before including this file for PCH Zb }PP;O  
#endif Ww(_EW  
#include "resource.h" // main symbols <di_2hN  
class CHookApp : public CWinApp i`SF<)M(  
{ 31* 6 ;(  
 public: f lB,_  
  CHookApp(); \+u qP:Ty  
  // Overrides X2uX+}h*tA  
  // ClassWizard generated virtual function overrides [dJ\|=  
  //{{AFX_VIRTUAL(CHookApp) 4r. W:}4:  
 public: 19.cf3Dh  
  virtual BOOL InitInstance(); vRq xZN  
  virtual int ExitInstance(); DsX>xzM  
  //}}AFX_VIRTUAL ZH(.| NaH  
  //{{AFX_MSG(CHookApp) dvD<>{U,8  
  // NOTE - the ClassWizard will add and remove member functions here. LbR-uc?x  
  // DO NOT EDIT what you see in these blocks of generated code ! WNb$2q=  
  //}}AFX_MSG ZYsFd_  
  DECLARE_MESSAGE_MAP()  +o  
}; t4IJ%#22  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); =vc5,  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); '/H(,TM  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _6m3$k_[MJ  
BOOL InitHotkey(); rxK0<pWJhx  
BOOL UnInit(); (OqJet2{+  
#endif QC4T=E]` j  
[j? <9  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. gHx-m2N  
#include "stdafx.h" x3s^u~C)(w  
#include "hook.h" +I<Sq_-  
#include <windowsx.h> faq K D:  
#ifdef _DEBUG %jxuH+L   
#define new DEBUG_NEW [!&k?.*;<  
#undef THIS_FILE A,{D9-%  
static char THIS_FILE[] = __FILE__; xiF%\#N  
#endif .NT&>X~.V  
#define MAX_KEY 100 zcKC5vqb  
#define CTRLBIT 0x04 ElXe=5L\#  
#define ALTBIT 0x02 i'wF>EBz  
#define SHIFTBIT 0x01 V@S/!h+  
#pragma data_seg("shareddata") !7)ID7d  
HHOOK hHook =NULL; #'x?) AS  
UINT nHookCount =0; 5Mr;6 ]I<  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey {_Qxe1^g  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT / D ]B  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 3@] a#>  
static int KeyCount =0; \=7=>x_  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 3~</lAm;  
#pragma data_seg() %5*#c*)R  
HINSTANCE hins; > bF!Y]H  
void VerifyWindow(); M@g gLW  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) i8Y gG0[)  
//{{AFX_MSG_MAP(CHookApp) wWw/1i:|'  
// NOTE - the ClassWizard will add and remove mapping macros here. k_n{Mss'9  
// DO NOT EDIT what you see in these blocks of generated code! n ;5?^Un%  
//}}AFX_MSG_MAP LtztjAm.  
END_MESSAGE_MAP() uAs*{:4n  
LH#LBjOZk  
CHookApp::CHookApp() %-/:ps  
{ t4/eB<fP  
 // TODO: add construction code here, _-\s[p5  
 // Place all significant initialization in InitInstance ZPsY0IzLo  
} ?0NSjK5ma  
Ro]IE|Fv  
CHookApp theApp; %"Q!5qH&  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) iwJ-<v_:h  
{ e H  
 BOOL bProcessed=FALSE; T(UYlLe  
 if(HC_ACTION==nCode) mzxvfXSF  
 { iT5SuIv  
  if((lParam&0xc0000000)==0xc0000000){// Key up M5kHD]b  
   switch(wParam) )ek 5  
   { aRKRy  
    case VK_MENU: W4*BR_H&*  
     MaskBits&=~ALTBIT; ~e<'t4  
     break; 0t/y~TrBY  
    case VK_CONTROL: DG*o w^  
     MaskBits&=~CTRLBIT; 7(8  
     break; %C6zXiO"  
    case VK_SHIFT: '&:x_WwVrO  
     MaskBits&=~SHIFTBIT; $lAb6e$n  
     break; Q(5:~**I  
    default: //judge the key and send message xO<-<sRA  
     break; 0nz@O^*g(  
   } pZ~> l=-  
   for(int index=0;index<MAX_KEY;index++){ V 1nZ M  
    if(hCallWnd[index]==NULL) $t# ,'M  
     continue; Ym{%"EB  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) gpK_0?%  
    { jnp6qpY{  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); %[\x%m)  
     bProcessed=TRUE; gDNTIOV  
    } _K}_h\e.  
   } 5m USh3  
  } G\>\VA  
  else if((lParam&0xc000ffff)==1){ //Key down +.#S[G  
   switch(wParam) `J#xyDL6?  
   { <Mn7`i  
    case VK_MENU: &iiK ZZ`_o  
     MaskBits|=ALTBIT; !BQ ELB$0  
     break; K: o|kd  
    case VK_CONTROL: /W$y"!^)J1  
     MaskBits|=CTRLBIT; bC4* w O  
     break; #1dTM-  
    case VK_SHIFT: P tQ#  
     MaskBits|=SHIFTBIT; renmz,dJ,  
     break; Be>c)90bO_  
    default: //judge the key and send message EXW 6yXLV  
     break; wJos'aTmE  
   } k3/JQ]'D  
   for(int index=0;index<MAX_KEY;index++) M |Q  
   { JeTrMa2  
    if(hCallWnd[index]==NULL) Hrg=sR  
     continue; -~O;tJF2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9g&)6,<  
    { fo\J \  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ?Y6la.bc{  
     bProcessed=TRUE; >c y.]uB  
    } F `pyhc>1;  
   } 95?5=T F  
  } hXQg=Sj  
  if(!bProcessed){ ?^48Zq6wM  
   for(int index=0;index<MAX_KEY;index++){ N7$DRG/<b  
    if(hCallWnd[index]==NULL) C*y6~AYN#  
     continue; r< ?o}Qq  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) O{ %A&Ui  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 3w^J"O/T  
   } ^,Y~M_=  
  } ^W[B[Y<k  
 } r6`^>c  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); |6(qg5"  
} llaZP(pJ  
Av v  
BOOL InitHotkey() =Mu'+,dT  
{ ~0[G/A$]  
 if(hHook!=NULL){ 4&]To@>  
  nHookCount++; z)W#&JFF  
  return TRUE; ^tg6JB;s  
 } !: EW21m  
 else lQ<#jxp  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ~Miin   
  if(hHook!=NULL) {F(-s"1;xO  
   nHookCount++; $O~F>.*  
  return (hHook!=NULL); K+ 7yUF8XP  
} ,LW(mdIe(  
BOOL UnInit() s9_`Wrg?  
{ /[nZ#zj!3  
 if(nHookCount>1){ =Qj+Ug'  
  nHookCount--; Qor{1_h)+9  
  return TRUE; R(/[NvUb  
 } 71 L\t3fG  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ."F'5eTT~  
 if(unhooked==TRUE){ >d27[%  
  nHookCount=0; _!C)r*0(  
  hHook=NULL; vA2,&%jw  
 } xu"94y+  
 return unhooked; /HjI=263  
} {? K|(C  
0+n&BkS'  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 7SA-OFM  
{ TRySl5jx@  
 BOOL bAdded=FALSE; :_fjml/  
 for(int index=0;index<MAX_KEY;index++){ p;n3`aVh  
  if(hCallWnd[index]==0){ XC7Ty'#"KX  
   hCallWnd[index]=hWnd; l?@MUsg+  
   HotKey[index]=cKey; " g0-u(Y  
   HotKeyMask[index]=cMask; O{")i;v @  
   bAdded=TRUE; y?Hj %,  
   KeyCount++; w8ZHk?:  
   break; Y>78h2AU  
  } BYr_Lz|T  
 } KB%j! ?  
 return bAdded; 'XP>} m  
} +B`'P9Zk@  
z,}c?BP  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) EDq$vB  
{ tyn?o  
 BOOL bRemoved=FALSE; EU^}NZW&v:  
 for(int index=0;index<MAX_KEY;index++){ cwM#X;FGq  
  if(hCallWnd[index]==hWnd){ !!-}ttFA  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 9&O#+FU  
    hCallWnd[index]=NULL; aeuf, #  
    HotKey[index]=0; <4l.s  
    HotKeyMask[index]=0; Qr|N)  
    bRemoved=TRUE; .-('C> @  
    KeyCount--; k7yv>iN  
    break; }sTH.%  
   } ( E"&UC[  
  } uKR\Xo}  
 } so?pA@O  
 return bRemoved; cotxo?)Zv  
} o;M.Rt\A  
|n|U;|'^  
void VerifyWindow() -!'Oy%a#  
{ V_+}^  
 for(int i=0;i<MAX_KEY;i++){ 0\\ueMj  
  if(hCallWnd!=NULL){ {2}tPT[a(  
   if(!IsWindow(hCallWnd)){ zqHpT^B?  
    hCallWnd=NULL; pIID= 8RJ.  
    HotKey=0; Wz6]*P`qv  
    HotKeyMask=0; xecieC  
    KeyCount--; jy\W_CT  
   } p|FlWR'mA  
  } )XmCy"xx  
 } AkYupP2]v  
} iXUWIgr  
^f^-.X  
BOOL CHookApp::InitInstance() KAj"p9hq+k  
{ _Hz~HoNU  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ? -v  
 hins=AfxGetInstanceHandle(); ,h%D4EVx  
 InitHotkey(); pr62:  
 return CWinApp::InitInstance(); (*Gi~?-  
} }j+~'O4m  
qy7hkq.uX  
int CHookApp::ExitInstance() ^3Z7dIUww  
{ $ 7U Dz  
 VerifyWindow(); UC8vR>e\  
 UnInit(); Whv]88w{  
 return CWinApp::ExitInstance(); 7>nhIp))  
} +8LM~voB  
,~?A,9?%:  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file J- t=1  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) (l\a'3a.  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ $l#v/(uFa  
#if _MSC_VER > 1000 ( GFgt_  
#pragma once +G*"jI8W  
#endif // _MSC_VER > 1000 V+qFT3?-  
y;,=a jrF  
class CCaptureDlg : public CDialog Ez zTJ>  
{ 2x-'>i_|g  
 // Construction a~8:rW^  
 public: /_NkB$&  
  BOOL bTray; fkdf~Vb  
  BOOL bRegistered; D+| K%_Qq  
  BOOL RegisterHotkey(); HBt|}uZ?6i  
  UCHAR cKey; G"G{AS  
  UCHAR cMask; SL[rn<x|  
  void DeleteIcon(); ,|e}Y [  
  void AddIcon(); j4E H2v  
  UINT nCount; R(M}0JRm  
  void SaveBmp(); d4jVdOq2  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor KotPV  
  // Dialog Data Hfh@<'NL]  
  //{{AFX_DATA(CCaptureDlg) MC4284A5  
  enum { IDD = IDD_CAPTURE_DIALOG }; ShC_hi  
  CComboBox m_Key; Y*5Z)h 1  
  BOOL m_bControl; 8!Wfd)4=,F  
  BOOL m_bAlt; =jJ H^Y2  
  BOOL m_bShift; >}-~rZ  
  CString m_Path; `)rg|~#k  
  CString m_Number; |?\gEY-Se  
  //}}AFX_DATA %)zk..K{l  
  // ClassWizard generated virtual function overrides 9k+N3vA  
  //{{AFX_VIRTUAL(CCaptureDlg) v57N^DR{  
 public: U8 Z~Y}29  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ' oBo|  
 protected: l'|E,N>X  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support \BN|?r$a  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ^ H'hD  
  //}}AFX_VIRTUAL J9g|#1G  
  // Implementation /yLzDCKn  
 protected: aXRv}WO$>k  
  HICON m_hIcon; _aVJ$N.  
  // Generated message map functions /)sDnJ1r  
  //{{AFX_MSG(CCaptureDlg) * eA{[  
  virtual BOOL OnInitDialog(); Gh2#-~|cB  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); %GM>u2baw  
  afx_msg void OnPaint(); ^$e0t;W=  
  afx_msg HCURSOR OnQueryDragIcon(); /m97CC#+  
  virtual void OnCancel(); VT'0DQ!NIq  
  afx_msg void OnAbout(); o^6jyb!j  
  afx_msg void OnBrowse(); 4uFIpS|rq  
  afx_msg void OnChange(); 3Z_t%J5QZ$  
 //}}AFX_MSG [_j6cj]  
 DECLARE_MESSAGE_MAP() :9(3h"  
}; `2>XH:+7F  
#endif  `>%-  
\|v`l{  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file V@B7 P{gH  
#include "stdafx.h" `Ac:f5a  
#include "Capture.h" +T-@5 v[  
#include "CaptureDlg.h" YKc>6)j  
#include <windowsx.h> )V=0IZi  
#pragma comment(lib,"hook.lib") V{43HA10b  
#ifdef _DEBUG xC<R:"Mn  
#define new DEBUG_NEW I|H,)!Z  
#undef THIS_FILE 5i|s>pD4z1  
static char THIS_FILE[] = __FILE__; ):/,w!1  
#endif  ~q*i;*  
#define IDM_SHELL WM_USER+1 PoJmW^:}  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `tX@8|  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Nfr:`$k  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; P=c?QYF  
class CAboutDlg : public CDialog L {!ihJr  
{ :lNg:r$4  
 public: X2i*iW<  
  CAboutDlg(); YdK _.t0Mu  
  // Dialog Data s\6N }[s  
  //{{AFX_DATA(CAboutDlg) p Z"o@';!  
  enum { IDD = IDD_ABOUTBOX }; nlaG<L#  
  //}}AFX_DATA |Mt&p#y  
  // ClassWizard generated virtual function overrides \xF;{}v  
  //{{AFX_VIRTUAL(CAboutDlg) :=y0'f V(@  
 protected: Dzo{PstM%  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support e"*BHvy F  
  //}}AFX_VIRTUAL R_7 6W&  
  // Implementation S)+CTVVE  
 protected: tL1P<1j_  
  //{{AFX_MSG(CAboutDlg) vuXS/ d  
  //}}AFX_MSG HF]EU!OT  
  DECLARE_MESSAGE_MAP() p7s@%scp  
}; >o#ERNf  
h(_P9E[g  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) \WcB9  
{ [ne" T  
 //{{AFX_DATA_INIT(CAboutDlg) +)zDA:2Wa"  
 //}}AFX_DATA_INIT I|Z/`9T  
} Np$z%ewK.  
6eM6[  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) #^Ys{  
{ ^/k ,  
 CDialog::DoDataExchange(pDX); z9 O~W5-U  
 //{{AFX_DATA_MAP(CAboutDlg)  O)OUy  
 //}}AFX_DATA_MAP 21 ViHV  
} B "*`R!y  
`v~!H\q  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) $Y6 3!*  
 //{{AFX_MSG_MAP(CAboutDlg) l nfm0  
 // No message handlers -xz|ayn  
 //}}AFX_MSG_MAP EVt? C+  
END_MESSAGE_MAP() fQ+\;iAU  
)4R:)-"f  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) A5fwAB  
: CDialog(CCaptureDlg::IDD, pParent) ""{|3XJe  
{ cu&,J#r%  
 //{{AFX_DATA_INIT(CCaptureDlg) RKZ6}q1n  
  m_bControl = FALSE; JN'cXZJPn  
  m_bAlt = FALSE;  Fl3#D7K  
  m_bShift = FALSE; g> S*<  
  m_Path = _T("c:\\"); -"Q-H/qh  
  m_Number = _T("0 picture captured."); eKN$jlg  
  nCount=0; @ O>&5gB1u  
  bRegistered=FALSE; ,RxYd6  
  bTray=FALSE; R}:KE&tq  
 //}}AFX_DATA_INIT k+^'?D--'P  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 N ]N4^A'  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); cK`"lxO  
} |3hY6aty  
xJZ@DR,#  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) %ZP+zh n}  
{ v4Ga0]VN$8  
 CDialog::DoDataExchange(pDX); ?BA^YF  
 //{{AFX_DATA_MAP(CCaptureDlg) j' 0r'  
  DDX_Control(pDX, IDC_KEY, m_Key); !yOeW0/2[  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); &~e$:8 +  
  DDX_Check(pDX, IDC_ALT, m_bAlt); C'A]i5  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); [5$w=u"j  
  DDX_Text(pDX, IDC_PATH, m_Path); xI*#(!x"G  
  DDX_Text(pDX, IDC_NUMBER, m_Number); }!>=|1 fY  
 //}}AFX_DATA_MAP ;z~n.0'  
} ul f2vD  
,m=4@ofX  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) D4JLtB'=  
//{{AFX_MSG_MAP(CCaptureDlg) k0-G$|QgIp  
 ON_WM_SYSCOMMAND() f:B>zp;N  
 ON_WM_PAINT() ,m<H-gwa  
 ON_WM_QUERYDRAGICON() 3]&o*Ib1`_  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) %ir:AS k  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) NS)}6OI3~"  
 ON_BN_CLICKED(ID_CHANGE, OnChange) &sXRN &Fp  
//}}AFX_MSG_MAP dsx]/49<  
END_MESSAGE_MAP() WKz> !E%  
'_k+WH&  
BOOL CCaptureDlg::OnInitDialog() Em 6Qe  
{ k67a'pmyJ  
 CDialog::OnInitDialog(); ^ci3F<?Q=  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); JO<wK  
 ASSERT(IDM_ABOUTBOX < 0xF000); E37<"(;  
 CMenu* pSysMenu = GetSystemMenu(FALSE); *'Y@3vKE  
 if (pSysMenu != NULL) !+)AeDc:j  
 { sVk$x:k1M  
  CString strAboutMenu; bwM@/g%DL  
  strAboutMenu.LoadString(IDS_ABOUTBOX); mGUO6>g  
  if (!strAboutMenu.IsEmpty()) 5]I|DHmu  
  { v:Tzv^  
   pSysMenu->AppendMenu(MF_SEPARATOR); 1i:|3PA~  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 8}X5o]Mv  
  } )*;zW! H  
 } AcI,N~~  
 SetIcon(m_hIcon, TRUE); // Set big icon Hn>B!Bm*  
 SetIcon(m_hIcon, FALSE); // Set small icon DrnJ;Hi"  
 m_Key.SetCurSel(0); %>-@K|:gS  
 RegisterHotkey(); &[NG]V!Oc  
 CMenu* pMenu=GetSystemMenu(FALSE); dVB~Smsr  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); b"!Q2S~  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); K7Rpr.p  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 'XY`(3q  
 return TRUE; // return TRUE unless you set the focus to a control 3d<HN6&U  
} '>$]{vQ3  
322jR4QGr  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) X#3et'  
{ 1]IQg;q  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) c wg !j!l  
 { fwK}/0%  
  CAboutDlg dlgAbout; iyj+:t/  
  dlgAbout.DoModal(); |#6QThK  
 } S= _vv)6+4  
 else d*)CT?d&  
 { &Tl 0Pf  
  CDialog::OnSysCommand(nID, lParam); moP,B~  
 } WTImRXK4  
} Dfq(Iv  
~QvqG{bFB  
void CCaptureDlg::OnPaint() 1x,[6H  
{ /axIIfx-  
 if (IsIconic()) &WNf M+  
 { 1hcjSO  
  CPaintDC dc(this); // device context for painting lA>DS#_  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); dCj,b$  
  // Center icon in client rectangle \P1S|ufv  
  int cxIcon = GetSystemMetrics(SM_CXICON); /-bO!RTwf  
  int cyIcon = GetSystemMetrics(SM_CYICON); J|&JD?  
  CRect rect; wywQ<n  
  GetClientRect(&rect); ^"J8r W6[  
  int x = (rect.Width() - cxIcon + 1) / 2; 5) -~mW y  
  int y = (rect.Height() - cyIcon + 1) / 2; V+I|1{@i0  
  // Draw the icon *N{emwIq  
  dc.DrawIcon(x, y, m_hIcon); 35tu>^_#V  
 } $95h2oXt  
 else i hh/sPi  
 { rj6#1kt  
  CDialog::OnPaint(); 5Ri6Z#qm  
 } ?_I[,N?@41  
} Ug&,Y/tFw2  
'Ysx=  
HCURSOR CCaptureDlg::OnQueryDragIcon() bQ~j=\[r  
{ 6M13f@v  
 return (HCURSOR) m_hIcon; <!pY$  
} 26xXl|I  
;A#`]-i C  
void CCaptureDlg::OnCancel() ?s:d[To6  
{ To?W?s  
 if(bTray) Y5F]:gs@  
  DeleteIcon(); OK\A</8r  
  CDialog::OnCancel(); }<dRj  
} .l@xsJn  
A'2w>8  
void CCaptureDlg::OnAbout() 6 ~ >FYX  
{ =C~/7N,lW]  
 CAboutDlg dlg; 1AU#%wIEP  
 dlg.DoModal(); W^G>cC8.L  
} .w]GWL  
[ :zO}r:  
void CCaptureDlg::OnBrowse() .jj$Kh q]  
{ Fy.\7CL>  
 CString str; $ aUo aI  
 BROWSEINFO bi; *6} N =Z  
 char name[MAX_PATH]; 8O Soel  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); \|K;-pL  
 bi.hwndOwner=GetSafeHwnd(); hXA6D)   
 bi.pszDisplayName=name; z@wMc EH  
 bi.lpszTitle="Select folder"; $]8h $  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; lEV]4 t_H  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); =KR NvW  
 if(idl==NULL) 7PkJ-JBA  
  return; 1|ra&(=)  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ?.YOI.U^  
 str.ReleaseBuffer(); 3mOtW%Hl  
 m_Path=str; .j-IX1Sa  
 if(str.GetAt(str.GetLength()-1)!='\\') 1 CHeufQ  
  m_Path+="\\"; FHC \?Cg  
 UpdateData(FALSE); g>J<%z, }2  
} ldp%{"ZZ  
ak;*W  
void CCaptureDlg::SaveBmp() l \sU  
{ V<j.xd7  
 CDC dc; u{*SX k  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); zSFDUZ]A3  
 CBitmap bm; l~ M_S<4n  
 int Width=GetSystemMetrics(SM_CXSCREEN); ,%)6jYHRw  
 int Height=GetSystemMetrics(SM_CYSCREEN); rs~wv('  
 bm.CreateCompatibleBitmap(&dc,Width,Height); qBCK40   
 CDC tdc; qv@$ZLR  
 tdc.CreateCompatibleDC(&dc); 3.qTLga|}  
 CBitmap*pOld=tdc.SelectObject(&bm); p1|f<SF')  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); K=,F#kn  
 tdc.SelectObject(pOld); M`l.t -ut  
 BITMAP btm; FD8N"p  
 bm.GetBitmap(&btm); sxt-Vs7+6  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; #cCL.p"]  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); D`VM6/iQR  
 BITMAPINFOHEADER bih; PoT`}-9  
 bih.biBitCount=btm.bmBitsPixel; a(0*um(  
 bih.biClrImportant=0; uxzze~_+C  
 bih.biClrUsed=0; fF V!)Zj  
 bih.biCompression=0; G;~V  
 bih.biHeight=btm.bmHeight; _C`K*u 6Z<  
 bih.biPlanes=1; `YI f_a{  
 bih.biSize=sizeof(BITMAPINFOHEADER); B}&xaY  
 bih.biSizeImage=size; k0Uyf~p~  
 bih.biWidth=btm.bmWidth; {1b Zg  
 bih.biXPelsPerMeter=0; .3MIcj=p  
 bih.biYPelsPerMeter=0; a$Cdhx !  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); )-`;1ca)s  
 static int filecount=0; mljh|[  
 CString name;  $O dCL  
 name.Format("pict%04d.bmp",filecount++); cwL1/DGDB  
 name=m_Path+name; Xt'sQ}  
 BITMAPFILEHEADER bfh; kVy\b E0o  
 bfh.bfReserved1=bfh.bfReserved2=0; _`pD`7:aI^  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ''Cay0h  
 bfh.bfSize=54+size; r!{LLc}>  
 bfh.bfOffBits=54; R]i7 $}n  
 CFile bf; 6O}`i>/6M  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){  1"e)5xI  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Z%n(O(^L  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); h@LHRMO  
  bf.WriteHuge(lpData,size); ]C:l,I  
  bf.Close(); ]hbyELs  
  nCount++; Qx'`PNU9\  
 } w#g#8o>'  
 GlobalFreePtr(lpData); ;JRs?1<='  
 if(nCount==1) T0]*{k(FR  
  m_Number.Format("%d picture captured.",nCount); DHY@akhrK  
 else ZPD[5) ~  
  m_Number.Format("%d pictures captured.",nCount); u3o#{~E/#  
  UpdateData(FALSE); aN,M64F  
} "&%#!2  
(S v~2  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) }nMPSerE  
{ +|ycvHd  
 if(pMsg -> message == WM_KEYDOWN) :,DM*zBV p  
 { $]q8, N|1  
  if(pMsg -> wParam == VK_ESCAPE) 2^^=iU=!<|  
   return TRUE; zdp/|"D!  
  if(pMsg -> wParam == VK_RETURN) YXI'gn2b#  
   return TRUE; -@Uqz781  
 } nQ/E5y  
 return CDialog::PreTranslateMessage(pMsg); EMc;^ d  
} s|NjT  
Q[d}J+l4{  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) V3ndV-uQE  
{ +/ &_v^sC;  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ "hy.GWF|*  
  SaveBmp(); W mm4hkf  
  return FALSE; b%Eei2Gm%  
} Ii:>xuF&  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ DSj(]U~r  
 CMenu pop; t>uN'oCyC  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); LbII?N8`N  
 CMenu*pMenu=pop.GetSubMenu(0); MG?0>^F  
 pMenu->SetDefaultItem(ID_EXITICON); o'$jNciOW  
 CPoint pt; 2r 6'O6v  
 GetCursorPos(&pt); G!XIc>F*  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); >pr=|$zk=  
 if(id==ID_EXITICON)  <Tot|R;  
  DeleteIcon(); ]K*8O <  
 else if(id==ID_EXIT) AZ{^o4<q  
  OnCancel(); 5IbJ  
 return FALSE; l]]l  
} .E@|D6$D  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); U bYEEY#  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) :F?x)"WoQ+  
 AddIcon(); XhPe]P  
 return res; 1c@} C+F+  
} -&e92g&n   
Y+3!f#exm  
void CCaptureDlg::AddIcon() @EoZI~  
{ @;?T~^nGj  
 NOTIFYICONDATA data; k'PQ} ,Vb  
 data.cbSize=sizeof(NOTIFYICONDATA); W@2vjz  
 CString tip; (S^8UV  
 tip.LoadString(IDS_ICONTIP); 5p +ZD7jK  
 data.hIcon=GetIcon(0); uZi.HG{<)  
 data.hWnd=GetSafeHwnd(); K)_WL]RJ.4  
 strcpy(data.szTip,tip); 3! ~K^Z]  
 data.uCallbackMessage=IDM_SHELL; [>|FB'  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 2:LHy[{5  
 data.uID=98; T{}fHfM  
 Shell_NotifyIcon(NIM_ADD,&data); d HJhFw  
 ShowWindow(SW_HIDE); D\H/   
 bTray=TRUE; cUO<.  
} /(8a~f&%r  
1JEnnqu  
void CCaptureDlg::DeleteIcon() ="d*E/##  
{ pDh se2  
 NOTIFYICONDATA data; g`>og^7g  
 data.cbSize=sizeof(NOTIFYICONDATA); :L 3&FA   
 data.hWnd=GetSafeHwnd(); J# kl 7  
 data.uID=98; 1h7+@#<:a  
 Shell_NotifyIcon(NIM_DELETE,&data); {5|("0[F  
 ShowWindow(SW_SHOW); @d&/?^dp6  
 SetForegroundWindow(); #Z~C`n u  
 ShowWindow(SW_SHOWNORMAL); xE-7P|2  
 bTray=FALSE; Hk7K`9  
} H7[6yh  
mNYl@+:psj  
void CCaptureDlg::OnChange() <:|3rfm#  
{ X _$a,"'~)  
 RegisterHotkey(); 2ij# H ;  
} m%#`y\]I  
~}DQT>7$  
BOOL CCaptureDlg::RegisterHotkey() ,1/}^f6  
{ gf)t)-E  
 UpdateData(); EC6k{y}bA  
 UCHAR mask=0; bqx0d=Z~[  
 UCHAR key=0; &2I*0  
 if(m_bControl) [hRU&z;W  
  mask|=4; c6Q(Ygc  
 if(m_bAlt) OJb*VtZz5R  
  mask|=2; kWj \x|E  
 if(m_bShift) 9tg)Mo%  
  mask|=1; D,ly#Nn  
  key=Key_Table[m_Key.GetCurSel()]; b @;.F!x  
 if(bRegistered){ W0cgI9=9  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); (ozb%a#B  
  bRegistered=FALSE; |vFj*XU  
 } q1k{  
 cMask=mask; eX l=i-'  
 cKey=key; N6Z{BLZ  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); xeTgV&$@  
 return bRegistered; hF&}lPVtv  
} <JI& {1  
y~<@x.  
  四、小结 o'%e I  
sNU}n<J-  
  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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