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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: 2ul!f7#E  
  :70cOt~Z  
  一、实现方法 -fu=RR  
SesJg~8  
  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: n0#HPI"  
;wCp j9hir  
#pragma data_seg("shareddata") ?#^(QR|/  
HHOOK hHook =NULL; //钩子句柄 :`6E{yfM  
UINT nHookCount =0; //挂接的程序数目 w^09|k  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 WZaOw w  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 uUb[Dqn  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ;Dg8>  
static int KeyCount =0; SlvQ)jw%  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 EeWCy5W  
#pragma data_seg() S2/c2  
|S#)[83*3  
  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。 O G#By6O  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: M H }4F  
eS9/- Y  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 'Syq!=,  
cKey,UCHAR cMask) rgheq<B:  
{ weC$\st:D  
 BOOL bAdded=FALSE; SLRQ3<0W_  
 for(int index=0;index<MAX_KEY;index++){ {zhN>n_  
  if(hCallWnd[index]==0){ i[)H!%RV*  
   hCallWnd[index]=hWnd; Dt\F]\6sd  
   HotKey[index]=cKey; }ex2tkz  
   HotKeyMask[index]=cMask; Jla ;^X  
   bAdded=TRUE; |) QE+|?P  
   KeyCount++; Kr`Cr5v  
   break; RP&H9>  
  } p%5RE%u  
 } 3B95t-  
 return bAdded; *b9=&:pU(  
} !u)ve h3x  
//删除热键 XPE{]4 g  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) */ZrZ^?o  
{ 5'gV_U  
 BOOL bRemoved=FALSE; 4' bup h1(  
 for(int index=0;index<MAX_KEY;index++){ y)?Sn  
  if(hCallWnd[index]==hWnd){ 0}jB/Z_T  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ DWZ!B7Ts  
    hCallWnd[index]=NULL; H `Fe |6I&  
    HotKey[index]=0; 9r% O  
    HotKeyMask[index]=0; <e|I?zI9-  
    bRemoved=TRUE; {Cnz7TVB  
    KeyCount--; -sl] funRy  
    break; I?@9;0R  
   } SUxz &xH  
  } HjUs}#</  
 } k,O("T[  
 return bRemoved; bCHA!zO  
} he;;p="!*  
1I^[_ /_\y  
S !cc%  
  DLL中的钩子函数如下: U bT7  
#WlIH7J8Tc  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) k2muHKBlk  
{ )xIk#>)  
 BOOL bProcessed=FALSE; jD9 ^DzFx  
 if(HC_ACTION==nCode) + |MHiC  
 { ]cLO-A  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 6}A1^RB+w  
   switch(wParam) 0 3kzS ]g  
   {  a=\r~Z7E  
    case VK_MENU: OF*m 9  
     MaskBits&=~ALTBIT; GL'zs8AKf  
     break; yhg^1l|t,  
    case VK_CONTROL: 0|n1O)>J  
     MaskBits&=~CTRLBIT; 0dA'f0Uy\X  
     break; sI/Jhw)  
    case VK_SHIFT: zl\mBSBx"  
     MaskBits&=~SHIFTBIT; x\!Q[  
     break; b&X- &F  
    default: //judge the key and send message -kT *gIJ}  
     break; j-@3jFu  
   } }N!I|<"/  
   for(int index=0;index<MAX_KEY;index++){ j u`x   
    if(hCallWnd[index]==NULL) lAz.I  
     continue; u{maE ,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) H->J.5~,K  
    { V9qA.NV2  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); `Xvrf  
     bProcessed=TRUE; [f,; +Ze  
    } v<N7o8  
   } 8.bIP ju%v  
  } W>+\A"  
  else if((lParam&0xc000ffff)==1){ //有键按下 E$dPu  
   switch(wParam) VeidB!GyP  
   { :hB/|H*=  
    case VK_MENU: ~#+ Hhc(  
     MaskBits|=ALTBIT; `)$'1,]u  
     break; G4][`C]8c  
    case VK_CONTROL: :786Z,')  
     MaskBits|=CTRLBIT; -t2bHhG  
     break; zts%oIgV  
    case VK_SHIFT: HM ;9%rtO  
     MaskBits|=SHIFTBIT; +]P? ?`,R;  
     break; 1>bG]l1//  
    default: //judge the key and send message f"j~{b7  
     break; :r* skV|  
   } :clMO|  
   for(int index=0;index<MAX_KEY;index++){ `b 6j7  
    if(hCallWnd[index]==NULL) ,,vl+Z <&  
     continue; 1:5jUUL8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )OxcJPo  
    { -@f5d  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); eSNi6RvE  
     bProcessed=TRUE; '=}F}[d"kk  
    } J P'|v"  
   } X@JrfvKv[d  
  } Kk|uN#m  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地  K9 h{sC  
   for(int index=0;index<MAX_KEY;index++){ IF-g %  
    if(hCallWnd[index]==NULL) wd&Tf R4!  
     continue; ew8f7S[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) V'y,{YpP  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); $6Z@0H@X  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 @ *'$QD,  
   } 53X H|Ap  
  } 0w[#`  
 } 60?/Z2w5  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ,tBb$T)7<  
} v;4l*)$)  
K1]m:Y<  
  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: Obwj=_+upd  
f/Cf2 K  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); _GSl}\  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); R+Q..9 P  
!*#2~$:  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: R]hilb'a  
G`3/${ti  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) #1c%3KaZ I  
{ e7rD,`NiV  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ";\na!MT  
 { &0A^_Z .nA  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ;s m )f  
  SaveBmp(); J eCKnt=  
  return FALSE; NJ\ID=3l  
 } Jb+cC)(  
 …… //其它处理及默认处理 TV#X@jQ  
} @}sxA9 a  
eiE36+'>b  
[k qx%4q)  
  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。 wJ 0KI[p(S  
(Q~ p"Ch  
  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。 8{QN$Qkn  
F2jZ3[P  
  二、编程步骤 _Ec9g^I10  
4 XSEN ]F  
  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"; >6xZF'4  
>drG,v0qh  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; CHxu%- g  
! *Snx  
  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; 4H@:|  
#w_cos[I  
  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; h$3o]~t  
1yHlBeEC  
  5、 添加代码,编译运行程序。 K1i@.`na/$  
B.)!zv\{  
三、程序代码 Lh eOGM  
x z5 V.  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL XNODDH   
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) `<}Q4p  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ _`'VOY`o  
#if _MSC_VER > 1000 Wx~N1+  
#pragma once X6hm,0[  
#endif // _MSC_VER > 1000 ;Ih:$"$!  
#ifndef __AFXWIN_H__ Q7u/k$qN  
#error include 'stdafx.h' before including this file for PCH i|5.DhK}  
#endif -.XICKz  
#include "resource.h" // main symbols J@$h'YUF  
class CHookApp : public CWinApp prJ]u H,  
{ BCy# Td  
 public: 7Aj o9  
  CHookApp(); 2/[J<c\G  
  // Overrides f,S,35`qa  
  // ClassWizard generated virtual function overrides s.VtmAH  
  //{{AFX_VIRTUAL(CHookApp) l-?B1gd,l  
 public: of?hP1kl[  
  virtual BOOL InitInstance(); K9\p=H^T7  
  virtual int ExitInstance(); }.+{M.[}  
  //}}AFX_VIRTUAL wrtJ8O(  
  //{{AFX_MSG(CHookApp) -B+Pl*  
  // NOTE - the ClassWizard will add and remove member functions here. TV&:`kH  
  // DO NOT EDIT what you see in these blocks of generated code ! r1vF/yt(  
  //}}AFX_MSG yDmNPk/  
  DECLARE_MESSAGE_MAP() `XT8}9z!  
}; ANqWY &f  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); zn!H&!8&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &d5n_:^  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); K=S-p3\g  
BOOL InitHotkey(); J3 Y-d7=|  
BOOL UnInit(); H] i.\2z  
#endif b A/,{R  
_>:R]2Ew  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. &`]Lg?J  
#include "stdafx.h" DjzHEqiH  
#include "hook.h" a| w.G "W  
#include <windowsx.h> W8bh49   
#ifdef _DEBUG (T&rvE  
#define new DEBUG_NEW j` RuK  
#undef THIS_FILE uP;qs8  
static char THIS_FILE[] = __FILE__; R ;XG2  
#endif rf}@16O$'  
#define MAX_KEY 100 WDr C  
#define CTRLBIT 0x04 ~f:y^`+Q[  
#define ALTBIT 0x02 {lNvKm)w  
#define SHIFTBIT 0x01 b-'T>1V  
#pragma data_seg("shareddata") k&oq6!ix  
HHOOK hHook =NULL; >d/DXv 3  
UINT nHookCount =0; aHhr_.>X  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey & B CA  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT kMJf!%L(  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ,Z_aZD4  
static int KeyCount =0; E[IjeJB5  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift h\]D:S  
#pragma data_seg() 8:D|[u;iG  
HINSTANCE hins; `1O<UJX  
void VerifyWindow(); YTb/ LeuT  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) S5%I+G3  
//{{AFX_MSG_MAP(CHookApp) 3c%dErch  
// NOTE - the ClassWizard will add and remove mapping macros here. `lI(SS]w  
// DO NOT EDIT what you see in these blocks of generated code! 1u9*)w  
//}}AFX_MSG_MAP gfr y5e  
END_MESSAGE_MAP() 7IEG%FY T  
A(j9T,!  
CHookApp::CHookApp() ]H%S GQPn  
{ -}_X'h&"  
 // TODO: add construction code here, ,RA;X  
 // Place all significant initialization in InitInstance Y! 8 I  
} 3izGMH_`  
utH/E7^8  
CHookApp theApp; F=T};b  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ( vO\h8  
{ ca@?-)  
 BOOL bProcessed=FALSE; 8ch^e[U`  
 if(HC_ACTION==nCode) O6 :GE'S  
 { lMn1e6~K  
  if((lParam&0xc0000000)==0xc0000000){// Key up {hP_"nN#  
   switch(wParam) vOF"p4 ^3  
   { W{)RJ1  
    case VK_MENU: =qg;K'M5  
     MaskBits&=~ALTBIT; U3oMY{{E J  
     break; ff{ L=uj  
    case VK_CONTROL: E((U=P}+g  
     MaskBits&=~CTRLBIT; goJK~d8M*  
     break; XA1gV>SJ  
    case VK_SHIFT: ~4T:v _Q7g  
     MaskBits&=~SHIFTBIT; tAi ~i;?  
     break; N*B_ or  
    default: //judge the key and send message .m;5s45O{  
     break; r2h{#2  
   } g`n5-D@3  
   for(int index=0;index<MAX_KEY;index++){ < 2 mbR  
    if(hCallWnd[index]==NULL) :gwM$2vv  
     continue; VKZZTFmV2)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) vq?aFX9F  
    { F4b$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);   (4GDh%  
     bProcessed=TRUE; KscugX*x  
    } PfrzrRahb  
   } n7>L&?N#y#  
  } U8||)  +  
  else if((lParam&0xc000ffff)==1){ //Key down VGe OoS  
   switch(wParam) _MmSi4]yd  
   { [yyL2=7  
    case VK_MENU: ~uUN\qx52  
     MaskBits|=ALTBIT; j=],n8_i  
     break; Ra!Br6  
    case VK_CONTROL: _ Vo35kA  
     MaskBits|=CTRLBIT; g)L?C'BG  
     break; #Yd 'Vve  
    case VK_SHIFT: bJWPr  
     MaskBits|=SHIFTBIT; -zSkon2Y^  
     break; 'zUWO_(  
    default: //judge the key and send message l(B(gPvU  
     break; ab@1JAgs  
   } u]<_6;_  
   for(int index=0;index<MAX_KEY;index++) +[lv `tr  
   { F<YXkG4 pO  
    if(hCallWnd[index]==NULL) CGp7 Tx#  
     continue; R?D c*,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 7_ G$&  
    { mne?r3d  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); #X`qkW.T<  
     bProcessed=TRUE; -Uj3?W  
    } )8_ x  
   } 1SwKd*aRR?  
  } phc9esz  
  if(!bProcessed){ K}feS(Ji  
   for(int index=0;index<MAX_KEY;index++){ x^959QO~  
    if(hCallWnd[index]==NULL) ?c6`p3p3L  
     continue; \F'tl{'\@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) /=i+7^  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); />13?o#  
   } gK#G8V-,  
  } "C~Zl&3  
 } a49xf^{1"i  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); @ )2<$d  
} "<Q,|Md  
~\yk{1S  
BOOL InitHotkey() vIQu"J&fE  
{ TGSkJ 1Lx  
 if(hHook!=NULL){ VJoobu1h  
  nHookCount++; 0;/},B[A  
  return TRUE; -|WQs'%O  
 } aS3Fvk0R{h  
 else 1Y6DzWI  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); |ZmWhkOX  
  if(hHook!=NULL) ;) (F4  
   nHookCount++; R[bI4|t  
  return (hHook!=NULL); #*zl;h1(  
} b9L" ?{  
BOOL UnInit() 9l&4mt;+&<  
{ I$Ra*r  
 if(nHookCount>1){ SKdh!*G  
  nHookCount--; 5bHS|<  
  return TRUE; gY/p\kwsj  
 } tYzpL   
 BOOL unhooked = UnhookWindowsHookEx(hHook); 2l.qINyz  
 if(unhooked==TRUE){ py':UQS*q  
  nHookCount=0; L Rn)  
  hHook=NULL; p3W-*lE  
 } CYH o~VIK  
 return unhooked; g54b}vzm  
} 1R"?X'w  
H]<@\g*l@P  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) >J['so2Bf  
{ RK\$>KFE  
 BOOL bAdded=FALSE; nN*:"F/^  
 for(int index=0;index<MAX_KEY;index++){ XnNU-UCX  
  if(hCallWnd[index]==0){ }}q_QD_  
   hCallWnd[index]=hWnd; Xt$o$V  
   HotKey[index]=cKey; C#tY};t  
   HotKeyMask[index]=cMask; 277Am*2  
   bAdded=TRUE; hTS?+l  
   KeyCount++; [39  
   break; [R%Pf/[Fr  
  } Ra-%,cS  
 } RKtU@MX49  
 return bAdded; .DN)ck:e;  
} Y| 2Gj(*8  
5m\T~[`%  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) nm{J  
{ ;+NU;f/WM  
 BOOL bRemoved=FALSE; 56l1&hp8In  
 for(int index=0;index<MAX_KEY;index++){ NzAMX+L  
  if(hCallWnd[index]==hWnd){ VPI;{0kh  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ^E}};CsT  
    hCallWnd[index]=NULL; Sft+Gb6  
    HotKey[index]=0; r zO5 3\  
    HotKeyMask[index]=0; 6JUjT]S%  
    bRemoved=TRUE;  }0f"SWO>  
    KeyCount--; s+7#TdhA  
    break; UR' P,  
   } ~Kll.  
  } )|Md"r_B  
 } =H)"t:xE  
 return bRemoved; cms9]  
} +-d)/h.7  
96]!*}  
void VerifyWindow() 3{FUFx  
{ En:/{~9{ F  
 for(int i=0;i<MAX_KEY;i++){ |9x H9@^f  
  if(hCallWnd!=NULL){ KL^hYjC  
   if(!IsWindow(hCallWnd)){ '\4 @  
    hCallWnd=NULL; 0sGAC  
    HotKey=0; G Z~W#*|V  
    HotKeyMask=0; {OGv1\ol&  
    KeyCount--; k]] e8>  
   } j" ~gEGfK  
  } Izr_]%  
 } HTw7l]]  
} kY.3x# w  
*c{X\!YBh  
BOOL CHookApp::InitInstance() # *)X+*  
{ :}{,u6\  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); @q<F_'7is  
 hins=AfxGetInstanceHandle(); m |%ly  
 InitHotkey(); #z&@f  
 return CWinApp::InitInstance(); ZMn~QU_5  
} (sN;B)  
'rSP@  
int CHookApp::ExitInstance() JV_V2L1Ut  
{ nhb: y  
 VerifyWindow(); Jo Ih2PD  
 UnInit(); ~Jlo>  
 return CWinApp::ExitInstance(); kHx6]<  
} S{7 R6,B5  
5FQtlB9F  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file DB>.Uf"  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) uX8yS|= *  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ]s<}'&  
#if _MSC_VER > 1000 *fg|HH+i  
#pragma once p6|RV(?8  
#endif // _MSC_VER > 1000 p8_ CY[U  
y~-dQ7r  
class CCaptureDlg : public CDialog Yj#4{2A  
{ |a{~Imz{  
 // Construction gkRbb   
 public: = k7}[!T  
  BOOL bTray; TL*8h7.(  
  BOOL bRegistered; oJ`cefcWo  
  BOOL RegisterHotkey(); G}ccf%  
  UCHAR cKey; j c-$l  
  UCHAR cMask; 8AQ@?\Rc"2  
  void DeleteIcon(); vAH`tPi>  
  void AddIcon(); KDEcR  
  UINT nCount; =*Ru 2  
  void SaveBmp(); H%^j yGS  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor c$AwJhl^]  
  // Dialog Data Jh!'"7  
  //{{AFX_DATA(CCaptureDlg) pon0!\ZT=  
  enum { IDD = IDD_CAPTURE_DIALOG }; wr{ [4$O  
  CComboBox m_Key; K! e51P  
  BOOL m_bControl; Ubf@"B  
  BOOL m_bAlt; '3eL^Aq  
  BOOL m_bShift; Z&[_8Y5j  
  CString m_Path; ;f l3'.S[  
  CString m_Number; 2uy<wJE >  
  //}}AFX_DATA ocDAg<wo  
  // ClassWizard generated virtual function overrides ]46#u=y~3  
  //{{AFX_VIRTUAL(CCaptureDlg) k< i#agq  
 public: LktH*ePO  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ccm(r~lhJ  
 protected: s?pd&_kOv3  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support KV {J>J1  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); l0GsY.~,  
  //}}AFX_VIRTUAL :$5$H  
  // Implementation R[T94U  
 protected: d&ap u{  
  HICON m_hIcon; dub %fs  
  // Generated message map functions [44C`x[8M+  
  //{{AFX_MSG(CCaptureDlg)  V9cKl[  
  virtual BOOL OnInitDialog(); =}^J6+TVL  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); P{ HYZg  
  afx_msg void OnPaint(); [zMnlO  
  afx_msg HCURSOR OnQueryDragIcon(); 1SO!a R#g  
  virtual void OnCancel(); <-rw>,  
  afx_msg void OnAbout(); #yi&-9B  
  afx_msg void OnBrowse(); G Rq0nhJ  
  afx_msg void OnChange(); O[RivHCY  
 //}}AFX_MSG yK"T5^o  
 DECLARE_MESSAGE_MAP() M# a1ev  
}; 1xsIM'&  
#endif s%xhT  
e_Un:r@)  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file @?E|]H!S]  
#include "stdafx.h" lS!uL9t.  
#include "Capture.h" %{*)-_M  
#include "CaptureDlg.h" .lE7v -e  
#include <windowsx.h> UD}#c:I  
#pragma comment(lib,"hook.lib") Z:3SI$tO  
#ifdef _DEBUG Ptj[9R  
#define new DEBUG_NEW rmh 1.W  
#undef THIS_FILE wM aqR"%  
static char THIS_FILE[] = __FILE__; Htn''adg5  
#endif i?0+f }5<p  
#define IDM_SHELL WM_USER+1 k/]4L!/ T  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ] lONi  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); e|2@z-Sp-  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; RP|/rd]-k  
class CAboutDlg : public CDialog -H-:b7  
{ XjINRC8^4  
 public: _Cnl|'  
  CAboutDlg(); b`yb{& ,?  
  // Dialog Data 9Impp5`/B  
  //{{AFX_DATA(CAboutDlg) uW4wTAk;qh  
  enum { IDD = IDD_ABOUTBOX }; JT(6Uf  
  //}}AFX_DATA }X?M6;$)  
  // ClassWizard generated virtual function overrides wcW8"J'AH  
  //{{AFX_VIRTUAL(CAboutDlg) M`u&-6  
 protected: op5G}QZ  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support >xB[k-C4  
  //}}AFX_VIRTUAL "Di8MMGOY  
  // Implementation q"C(`S.@  
 protected: i$ CN{c*  
  //{{AFX_MSG(CAboutDlg) 9qcA+gz:|  
  //}}AFX_MSG gR\-%<42  
  DECLARE_MESSAGE_MAP() nEgDwJ<wl  
}; %TUvH>;0  
e/s8?l  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ^]{m*bEkR  
{ l+HF+v$  
 //{{AFX_DATA_INIT(CAboutDlg) mMSQW6~j  
 //}}AFX_DATA_INIT qGVf! R  
} +p"}F PIK  
%8hjMds  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 05PRlz *x=  
{ P~d&PhOe  
 CDialog::DoDataExchange(pDX); 7xU6Ll+p  
 //{{AFX_DATA_MAP(CAboutDlg) *3Qwmom  
 //}}AFX_DATA_MAP oQ:.pq{T  
} d.Im{-S  
aTLu7C\-e  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) pEp`Z,p  
 //{{AFX_MSG_MAP(CAboutDlg) 2*)2c[/0F  
 // No message handlers K~6,xZlDWM  
 //}}AFX_MSG_MAP rU!QXg]uD  
END_MESSAGE_MAP() Ql8s7%  
|x#w8=VP-  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ]/ffA|"U`  
: CDialog(CCaptureDlg::IDD, pParent) %pG^8Q()   
{ cM 5V%w  
 //{{AFX_DATA_INIT(CCaptureDlg) OAw- -rl  
  m_bControl = FALSE; b<bj5m4fz>  
  m_bAlt = FALSE; [Rxbb+,U  
  m_bShift = FALSE; p'f8?jt  
  m_Path = _T("c:\\"); DElrY)3O.  
  m_Number = _T("0 picture captured."); Q /zlU@  
  nCount=0; ;eY.4/*R  
  bRegistered=FALSE; CyXFuk!R  
  bTray=FALSE; 'nRoa7v(  
 //}}AFX_DATA_INIT 0* ^>/*  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 dYxX%"J  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); O3KTKL]  
} -g\;B  
1Xn:B_pP  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ` G- V %  
{ $s]vZ(H  
 CDialog::DoDataExchange(pDX); ZULnS*V;5  
 //{{AFX_DATA_MAP(CCaptureDlg) iO@UzD #v  
  DDX_Control(pDX, IDC_KEY, m_Key); ic;M=dsh:  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); OC=g 1  
  DDX_Check(pDX, IDC_ALT, m_bAlt); zN3b`K. i  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); X%rsa7H3J  
  DDX_Text(pDX, IDC_PATH, m_Path); euiP<[|h=  
  DDX_Text(pDX, IDC_NUMBER, m_Number); !fmbm4!a  
 //}}AFX_DATA_MAP j/p1/sJ[y  
} ,[UK32KWI  
xNOArb5e5  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) {3`cSm6c  
//{{AFX_MSG_MAP(CCaptureDlg) RIdh],-  
 ON_WM_SYSCOMMAND() +=MN_  
 ON_WM_PAINT() Mj<T+Ohz  
 ON_WM_QUERYDRAGICON() 67b w[#v  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Q5xQ5Le  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Ek6z[G` O  
 ON_BN_CLICKED(ID_CHANGE, OnChange) z;Jz^m-  
//}}AFX_MSG_MAP 9y+0Zj+.  
END_MESSAGE_MAP() 38E %]*5F  
m"/ o4  
BOOL CCaptureDlg::OnInitDialog() L.?QZN%cN  
{ ;V0^uB.z  
 CDialog::OnInitDialog(); W"n0x8~sV  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); <q.Q,_cW  
 ASSERT(IDM_ABOUTBOX < 0xF000); ?>/9ae^Bw  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 7SJR_G6,{  
 if (pSysMenu != NULL) Z_;! f}X  
 { L6x;<gj  
  CString strAboutMenu; )lZoXt_3  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Y?v{V>;*A  
  if (!strAboutMenu.IsEmpty())  <BiSx  
  { A9_} RJ9  
   pSysMenu->AppendMenu(MF_SEPARATOR); !9t,#?!  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); WCD)yTg:ES  
  } z50P* eS  
 } ZA+w7S3  
 SetIcon(m_hIcon, TRUE); // Set big icon ^).  
 SetIcon(m_hIcon, FALSE); // Set small icon iY*fp=c9  
 m_Key.SetCurSel(0); F}~qTF;H  
 RegisterHotkey(); vzFo"  
 CMenu* pMenu=GetSystemMenu(FALSE); 0,whTnH|  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); dym K@  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Ji4JP0  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 8I[=iU7]l  
 return TRUE; // return TRUE unless you set the focus to a control Ef$a&*)PH  
} 43?uTnX/  
M;LR$'cP  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) @1N .;]|  
{ $1 t IC_  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Vbv)C3ezD  
 { !nU|3S[b  
  CAboutDlg dlgAbout; 4;*jE (  
  dlgAbout.DoModal(); NHiac(&*  
 } H1.ktG  
 else rS8}(lf  
 { .XT]\'vW  
  CDialog::OnSysCommand(nID, lParam); -v! ;  
 } Ye S5%?Fk  
} zfw=U \  
qV0GpVJZU?  
void CCaptureDlg::OnPaint() wxo*\WLe  
{ G=/^]E  
 if (IsIconic()) #y-R*4G  
 { Du #>y!  
  CPaintDC dc(this); // device context for painting Cto>~pV  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); .*edaDi  
  // Center icon in client rectangle +ib&6IU  
  int cxIcon = GetSystemMetrics(SM_CXICON); (q@%eor&}  
  int cyIcon = GetSystemMetrics(SM_CYICON); hg2Ywzfm-  
  CRect rect; 2]]}Xvx4#  
  GetClientRect(&rect); h~lps?.#b  
  int x = (rect.Width() - cxIcon + 1) / 2; ot0g@q[3  
  int y = (rect.Height() - cyIcon + 1) / 2; 5PsjGvm.%  
  // Draw the icon n^|SN9 _r  
  dc.DrawIcon(x, y, m_hIcon); l >~Rzw  
 } =o4gW`\z  
 else  SQ&}18Z~  
 { iU RSYR  
  CDialog::OnPaint(); m Uy>w  
 } OS-k_l L  
} NvC @  
$zM \Jd  
HCURSOR CCaptureDlg::OnQueryDragIcon() (&SPMhs_|(  
{ #(QS5J&Qq  
 return (HCURSOR) m_hIcon; +Sc2'z>R  
} NL,6<ZOon,  
_Q'f^Kj  
void CCaptureDlg::OnCancel() 0avtfQ +f  
{ zs6rd83#  
 if(bTray) PeIKx$$Kl{  
  DeleteIcon(); IrUoAQ2xpG  
  CDialog::OnCancel(); V?)YQ B  
} aJ@lT&.  
fr'DV/T  
void CCaptureDlg::OnAbout() $xCJ5M4  
{ d_!}9  
 CAboutDlg dlg; CaV@<T  
 dlg.DoModal(); {#~A `crO  
} -<L5;  
wrc1N?[bn  
void CCaptureDlg::OnBrowse() 8"TlWHF`  
{ jn`5{ ]D  
 CString str; W[sQ_Z1C  
 BROWSEINFO bi; z%BX^b$Hj  
 char name[MAX_PATH]; E@EP9X >  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); &c}2[=  
 bi.hwndOwner=GetSafeHwnd(); M3Qi]jO98  
 bi.pszDisplayName=name; I@5$<SN  
 bi.lpszTitle="Select folder"; YC$>D? FW  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; K4 -_a{)/  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); (|#%omLL  
 if(idl==NULL) cc3/XBo  
  return; w/:ibG@  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); T(,@]=d,DD  
 str.ReleaseBuffer(); J:J/AgJuH  
 m_Path=str; fda4M  
 if(str.GetAt(str.GetLength()-1)!='\\') ii&ckg>]z  
  m_Path+="\\"; 4]FS jVO  
 UpdateData(FALSE); [+8*}03  
} 1/,~0N9  
c>3j $D+  
void CCaptureDlg::SaveBmp() *2fJdY  
{ );h  
 CDC dc; XD" 4t4~>  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); "&{.g1i9  
 CBitmap bm; 6J_$dzw  
 int Width=GetSystemMetrics(SM_CXSCREEN); 2a;[2':  
 int Height=GetSystemMetrics(SM_CYSCREEN); gLY15v4?  
 bm.CreateCompatibleBitmap(&dc,Width,Height); @=%g{  
 CDC tdc; VoQhzp6&  
 tdc.CreateCompatibleDC(&dc); {6%-/$LX  
 CBitmap*pOld=tdc.SelectObject(&bm); scTt53v^  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 4;@L#Pzt  
 tdc.SelectObject(pOld); ;.<HpDfG_  
 BITMAP btm; uH(M@7"6_!  
 bm.GetBitmap(&btm); |Qb@.  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ,B /b>i  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 8Q"1I7U  
 BITMAPINFOHEADER bih; Q,Y^9g"B`~  
 bih.biBitCount=btm.bmBitsPixel; 8C? E1fH\  
 bih.biClrImportant=0; .|Yn[?(  
 bih.biClrUsed=0; p>f ?Rw_  
 bih.biCompression=0; z_=V6MDM  
 bih.biHeight=btm.bmHeight; M`8c|*G   
 bih.biPlanes=1; ;JMmr-@  
 bih.biSize=sizeof(BITMAPINFOHEADER); d^v.tYM$N  
 bih.biSizeImage=size; k2.k}?w!JO  
 bih.biWidth=btm.bmWidth; p$ETAvD  
 bih.biXPelsPerMeter=0; Jw>na _FJ  
 bih.biYPelsPerMeter=0; 2kk; z0f  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); O OXP1L  
 static int filecount=0; m. \JO  
 CString name; +G\i$d;St  
 name.Format("pict%04d.bmp",filecount++); u.*}'C>^^v  
 name=m_Path+name; 4)>S3Yr  
 BITMAPFILEHEADER bfh; KV-h~C  
 bfh.bfReserved1=bfh.bfReserved2=0; ;.rY`<|  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 5y] %Cu1.u  
 bfh.bfSize=54+size; MttFB;Tp  
 bfh.bfOffBits=54; %mD{rG9  
 CFile bf; Gd'_X D  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ic4hO>p&  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 4@Z!?QzW  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); E$ &bl  
  bf.WriteHuge(lpData,size); ks %arm&  
  bf.Close(); r:Q=6j,  
  nCount++; 3.g4X?=zd  
 } V#+F*w?&D  
 GlobalFreePtr(lpData); VS!v7-_N5  
 if(nCount==1) I~Qi):&x  
  m_Number.Format("%d picture captured.",nCount); _3NH"o d  
 else 1~},}S]id  
  m_Number.Format("%d pictures captured.",nCount); OF )*kiJ  
  UpdateData(FALSE); [Q\(k d*4  
} 3xmPY.  
D #7q3s  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) P2 qC[1hYH  
{ *cCj*Zr]  
 if(pMsg -> message == WM_KEYDOWN) [ wnaF|h  
 { ]=]MJ3_7  
  if(pMsg -> wParam == VK_ESCAPE) ykH@kv Qt  
   return TRUE; hy@b/Y![M  
  if(pMsg -> wParam == VK_RETURN) M;NIcM  
   return TRUE; s?&S<k-=fr  
 } NB86+2stu  
 return CDialog::PreTranslateMessage(pMsg); Y"^.6  
} ZR"qrCSw`  
_meW9)B  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) :7JP(j2  
{ Z c#Jb  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ M _lLP8W}  
  SaveBmp(); D~|q^Ms,%  
  return FALSE; 5*Qzw[[=  
} Y7 K2@257  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ E1`_[=8a9  
 CMenu pop; R~|(]#com  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ${}9/(x/^  
 CMenu*pMenu=pop.GetSubMenu(0); J, +/<Y!  
 pMenu->SetDefaultItem(ID_EXITICON); ~O!E&~  
 CPoint pt; -v|lM8  
 GetCursorPos(&pt); k,; (`L  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); PnB2a'(^@?  
 if(id==ID_EXITICON) <OJqeUo+*\  
  DeleteIcon(); $!_}d  
 else if(id==ID_EXIT) A/fM30  
  OnCancel(); V$oj6i{ky  
 return FALSE; !R#PJH/TM  
} tA'5ufj*:  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); .I$+ E  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) lz1cLl m  
 AddIcon();  -)KNsW  
 return res; h|i b*%P_  
} 1jAuW~  
eNM"e-  
void CCaptureDlg::AddIcon() 2+p XtP@O  
{ w>}n1Nc$G  
 NOTIFYICONDATA data; )]<^*b>  
 data.cbSize=sizeof(NOTIFYICONDATA); hJw]hVYa  
 CString tip; eb6y-TwY  
 tip.LoadString(IDS_ICONTIP); {ot6ssT=D  
 data.hIcon=GetIcon(0); =<zlg~i  
 data.hWnd=GetSafeHwnd(); AMO{ee7Po  
 strcpy(data.szTip,tip); L|1~'Fz#w  
 data.uCallbackMessage=IDM_SHELL; tL1\q Qg  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; yS[HYq  
 data.uID=98; Ij XxH]2  
 Shell_NotifyIcon(NIM_ADD,&data); ,_D@ggL-  
 ShowWindow(SW_HIDE); )7Qp9Fxo  
 bTray=TRUE; -%K}~4J  
} &%k_BdlkQ  
Y% @;\  
void CCaptureDlg::DeleteIcon() L `=*Pwcj  
{ Tu,nX'q]m  
 NOTIFYICONDATA data; T!pZj_ h=  
 data.cbSize=sizeof(NOTIFYICONDATA); 'aEN(Mdz1e  
 data.hWnd=GetSafeHwnd(); \_i22/Et  
 data.uID=98; x&m(h1h  
 Shell_NotifyIcon(NIM_DELETE,&data); $(08!U  
 ShowWindow(SW_SHOW); mv`b3 $  
 SetForegroundWindow(); nPl,qcyY  
 ShowWindow(SW_SHOWNORMAL); U!RIeC  
 bTray=FALSE; a5d_= :S ;  
} TV0Y{x*~iH  
TIaiJvo  
void CCaptureDlg::OnChange() n!lE|if  
{ [9Tnp]q  
 RegisterHotkey(); 0AoWw-H6V  
} MBU4Awj  
No+BS%F5  
BOOL CCaptureDlg::RegisterHotkey() &_j<! 3*  
{ *YX:e@Fm.a  
 UpdateData(); U2~|AkL  
 UCHAR mask=0; X &G]ci  
 UCHAR key=0; BJLeE}=H  
 if(m_bControl) F&3:]1  
  mask|=4; vBM<M3  
 if(m_bAlt) ymnK`/J!Q  
  mask|=2; FP0GE  
 if(m_bShift) g:p` .KuB  
  mask|=1; +JXn   
  key=Key_Table[m_Key.GetCurSel()]; g0s4ZI+T  
 if(bRegistered){ CDr0QM4k:.  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); LcNI$g;}Yf  
  bRegistered=FALSE; Mpk7$=hjc  
 } k)8*d{*  
 cMask=mask; Yfs eX;VX  
 cKey=key; )|5mW  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); D4$"02"  
 return bRegistered; WU.eeiX  
} l <Z7bo  
r&:yZN  
  四、小结 62G %.'7  
RQ#9[6w!v  
  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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