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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: BNU]NcA#*,  
  ydp?%RB3w  
  一、实现方法 HfN-WYiR  
9/Q_Jv-Q  
  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: Bkg/A;H  
".+wz1  
#pragma data_seg("shareddata") Id8^6FLw  
HHOOK hHook =NULL; //钩子句柄 p)}iUU2N  
UINT nHookCount =0; //挂接的程序数目 `q Sfo`  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 RB1c!h$u  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 cVv>"oF;~*  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey G=4Da~<ij  
static int KeyCount =0; @}@`lv65}  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 KobNi#O+  
#pragma data_seg() R03V+t=  
Bvx%|:R  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 5=CLR  
nA8]/r1k  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: cy=,Dr9O  
*yAC8\v  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR rg U$&O  
cKey,UCHAR cMask) <d$kGCz  
{ KA:>7-  
 BOOL bAdded=FALSE; @W3fKF9*R  
 for(int index=0;index<MAX_KEY;index++){ #W<D~C[I _  
  if(hCallWnd[index]==0){ ]>h2h?2te  
   hCallWnd[index]=hWnd; d!) &@k  
   HotKey[index]=cKey; ,sPsL9]$  
   HotKeyMask[index]=cMask; Zyq h  
   bAdded=TRUE; MtOA A  
   KeyCount++; xM85^B'  
   break; k1y&' 3%  
  } @Tmqw(n{  
 } ` c~:3^?9d  
 return bAdded; *LJN2;  
} BBw]>*  
//删除热键 kJIKULf  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) k)\Yl`4au  
{ ~ ar8e  
 BOOL bRemoved=FALSE; Z[8{V  
 for(int index=0;index<MAX_KEY;index++){ pKO\tkMJ  
  if(hCallWnd[index]==hWnd){ Qg  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ btb-MSkO  
    hCallWnd[index]=NULL; k^gnOU;  
    HotKey[index]=0; NC::;e  
    HotKeyMask[index]=0; ;;BQuG  
    bRemoved=TRUE; +s&+G![  
    KeyCount--; C/dqCUX:  
    break; lPm'>, }Y  
   } _[h1SAJ  
  } Mj5=t:MI  
 } Ni IX^&N1  
 return bRemoved; N(mhgC<O  
} *=}$@O S  
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+GMM&6<  
  DLL中的钩子函数如下:  K9  
%Bg} a  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) NwM=  
{ -WP_0  
 BOOL bProcessed=FALSE; UMUr"-l =  
 if(HC_ACTION==nCode) 0hcrQ^BB!b  
 { hBDPz1<  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 {>>ozB.  
   switch(wParam) p"ht|x  
   {  [ >#?C*s  
    case VK_MENU: 04NI.Jv  
     MaskBits&=~ALTBIT; &s_O6cqgh  
     break; `9b/Q  
    case VK_CONTROL: $A6'YgK  
     MaskBits&=~CTRLBIT; VR5$[-E3  
     break; bnLvJ]i)  
    case VK_SHIFT: &k(t_~m>  
     MaskBits&=~SHIFTBIT; hX\XNiCiK8  
     break; dUeM+(s1  
    default: //judge the key and send message UzFd@W u#  
     break; AR'q2/cw  
   } e#IED!U  
   for(int index=0;index<MAX_KEY;index++){ esmQ\QQ^1  
    if(hCallWnd[index]==NULL) 1g{`1[.QO  
     continue; uy{mSx?td  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) +#O?a`f  
    { MdT'xYomzQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); tDFN *#(  
     bProcessed=TRUE; =3lUr<Ze  
    } ?,NZ /n  
   } 6d"dJV.\  
  } [>&Nhn0iY  
  else if((lParam&0xc000ffff)==1){ //有键按下 '#[U7(lIQ  
   switch(wParam) %b'ic  
   { ohusL9D  
    case VK_MENU: 9ET2uDZpL  
     MaskBits|=ALTBIT; <QT u"i  
     break; ,6PV"E)_  
    case VK_CONTROL: ?sDm~]Z  
     MaskBits|=CTRLBIT; yd5r]6ej  
     break; L <]j&  
    case VK_SHIFT: D:'|poH  
     MaskBits|=SHIFTBIT; AS`0.RC-  
     break; Hk8:7"4Q  
    default: //judge the key and send message NZYtA7  
     break; <I'kJ{"  
   } MGX %U6  
   for(int index=0;index<MAX_KEY;index++){ 9 a2Ga   
    if(hCallWnd[index]==NULL) N8 }R<3/  
     continue; 5gZ0a4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) K,%H*1YKK  
    { b")&"o)G2W  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); vp &jSfQ^  
     bProcessed=TRUE; 5+:b #B  
    } wlBdA  
   } 1 9a"@WB@  
  } j(6:   
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 +pc_KR  
   for(int index=0;index<MAX_KEY;index++){ wA) NB  
    if(hCallWnd[index]==NULL) Ps Qq ^/  
     continue; b,/fz6 {N  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) //`heFuc]>  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); n@{fqj  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 <M=U @  
   } cH'*J/  
  } -\\}K\*MJ  
 } 7J./SBhB  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); |f'U_nE#R/  
} neJNMdv@T  
;r>?V2,tm  
  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: "R+ x  
%Nd|VAe  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); A,e/y  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); DSYtj} >  
=A9>Ej/  
  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: *aS|4M-  
6 +^V  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) m,aJ(8G  
{ iyU@|^B"Wa  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) =#n05*^  
 { e"hm|'  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 $1.iMHb  
  SaveBmp(); Fp4eGuWH#  
  return FALSE; ~el#pf~  
 } v<_}Br2I[  
 …… //其它处理及默认处理 I:u xj%  
} F}<&@7kF  
2{!'L'km  
a+szA};  
  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。 $&EZVZ{r  
W!.UMmw`  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 Wt()DG|[  
rw8O<No4.o  
  二、编程步骤 {o+aEMhM  
7<x0LW  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; AUcq\Ys  
|OF<=GGO+  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; >},O_qx  
t= "EbPE  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 7!hL(k[  
Q{b ZD*  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; +`u]LOAyP=  
r-'\<d(J$  
  5、 添加代码,编译运行程序。 yfiRMN"2  
;5ugnVXu  
三、程序代码 RPP xiYU^  
2,/("lV@0  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL f'\I52;FB  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) {}N*e"<O  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ wJ1qJ!s@  
#if _MSC_VER > 1000 9 }|Bs=q  
#pragma once oiJa1X  
#endif // _MSC_VER > 1000 (<s7X$(]e  
#ifndef __AFXWIN_H__ R +P,kD?  
#error include 'stdafx.h' before including this file for PCH %Ub"V\1  
#endif $%`OJf*k  
#include "resource.h" // main symbols )9##mUt'}  
class CHookApp : public CWinApp dP T)&  
{ f|WNPFQ$x  
 public: JVwYV5-O<0  
  CHookApp(); E0\ '  
  // Overrides qc|;qPj   
  // ClassWizard generated virtual function overrides E,shTh%&~  
  //{{AFX_VIRTUAL(CHookApp) \yNjsG@,  
 public: x^8xz5:O  
  virtual BOOL InitInstance(); I?J$";A  
  virtual int ExitInstance(); #p&iH9c_  
  //}}AFX_VIRTUAL 91E!4t}I  
  //{{AFX_MSG(CHookApp) 6vro:`R ?  
  // NOTE - the ClassWizard will add and remove member functions here. ruS/Yh  
  // DO NOT EDIT what you see in these blocks of generated code ! k)Z?  
  //}}AFX_MSG .sAcnf"  
  DECLARE_MESSAGE_MAP()  7.CzS  
};  {3yzC  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ]x:>~0/L  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); VhT4c+Zs  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); "Vho`x3  
BOOL InitHotkey(); y^Oj4Y:  
BOOL UnInit(); G'MYTq  
#endif FlOKTY   
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//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. zv  <,  
#include "stdafx.h" Of7j~kdh83  
#include "hook.h" ggVB8QN{  
#include <windowsx.h> $n(?oyf  
#ifdef _DEBUG ?qAX *j  
#define new DEBUG_NEW ]n${j/x  
#undef THIS_FILE Ec8Y}C,{7<  
static char THIS_FILE[] = __FILE__; cInzwdh7  
#endif BqvOi~ l  
#define MAX_KEY 100 gmLGK1  
#define CTRLBIT 0x04 FgE6j;   
#define ALTBIT 0x02 $.R$I&U  
#define SHIFTBIT 0x01 r&A#h;EQX2  
#pragma data_seg("shareddata") Jh{(xGA  
HHOOK hHook =NULL; Yt++  ?  
UINT nHookCount =0; .ZxSJ"Rk  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey %N|7<n<S  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Pw1V1v&> q  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey $ n`<,;^l  
static int KeyCount =0; #lM!s  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Mto3Ryic!  
#pragma data_seg()  .r[DqC  
HINSTANCE hins; szF[LRb  
void VerifyWindow(); Q5;K m1(  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) r9%4q4D?>9  
//{{AFX_MSG_MAP(CHookApp) VeA;zq  
// NOTE - the ClassWizard will add and remove mapping macros here. _p?lRU8  
// DO NOT EDIT what you see in these blocks of generated code! 2fO ~%!.G  
//}}AFX_MSG_MAP BEg%u)"([  
END_MESSAGE_MAP() `8xmM A_l  
qdCa]n!d  
CHookApp::CHookApp() Rde#=>@V  
{ lD6hL8[  
 // TODO: add construction code here, oPk2ac  
 // Place all significant initialization in InitInstance 6f?5/hq  
} !a[ voUS  
QVL92"  
CHookApp theApp; :o*{.  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Fb*^GH)J  
{ AVOqW0Z+y  
 BOOL bProcessed=FALSE; 8 fVI33  
 if(HC_ACTION==nCode) 2Q|Vg*x\U  
 { 3VCyq7 B^  
  if((lParam&0xc0000000)==0xc0000000){// Key up g 4=}].  
   switch(wParam) 0jrcXN~  
   { r444s8Y  
    case VK_MENU: J *.Nf)i  
     MaskBits&=~ALTBIT; tU!"CX  
     break; .P# c/SQp  
    case VK_CONTROL: ``1#^ `  
     MaskBits&=~CTRLBIT; P{)&#HXUVb  
     break; pHsp]a  
    case VK_SHIFT: %~4R)bsJ'  
     MaskBits&=~SHIFTBIT; B:n9*<v(  
     break; $A7[?Ai ?  
    default: //judge the key and send message ='pssdB  
     break; -[~{c]/c  
   } pA!+;Y!ZB<  
   for(int index=0;index<MAX_KEY;index++){ M98dQ%4I  
    if(hCallWnd[index]==NULL) [m|\N  
     continue; rD%(*|Y"c  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) uCNQ.Nbf C  
    { !z{bqPlFGG  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); KB&t31aq  
     bProcessed=TRUE; @>qzRo  
    } Pgr>qcbql  
   } wQ2'%T|t  
  } y 8];MTl  
  else if((lParam&0xc000ffff)==1){ //Key down \$VtwVQ,b  
   switch(wParam) |C=^:@}ri?  
   { X3!btxa% t  
    case VK_MENU: bRLmJt98P  
     MaskBits|=ALTBIT; lR{eO~'~V  
     break; jzI\Q{[m'  
    case VK_CONTROL: ~~;fWM '  
     MaskBits|=CTRLBIT; X z2IAiAs'  
     break; f>\?\!  
    case VK_SHIFT: ro}plK(<WQ  
     MaskBits|=SHIFTBIT; _t:rWC"X  
     break; ^gw_Up<e6  
    default: //judge the key and send message 6y%BJU.I  
     break; UI<'T3b  
   } =k2+VI  
   for(int index=0;index<MAX_KEY;index++) zIH[ :  
   {  >pv~$  
    if(hCallWnd[index]==NULL) +{]/ b%P  
     continue; `2J6Dz"W  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `;hsOfo  
    {  3i?{E ^  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); &hB~Z(zS!  
     bProcessed=TRUE; Z!G;q}zZ!  
    } S%Pk@n`z]  
   } 6%U1%;  
  } Gw~^6(Qu  
  if(!bProcessed){ J^ P/2a#a  
   for(int index=0;index<MAX_KEY;index++){ cP$b>3O  
    if(hCallWnd[index]==NULL) >`5iq.v  
     continue; n2Dnpe:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) +_Fsiu_b  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); n6O1\}YB  
   } 9V.)=*0hp  
  } OrPIvP<w@  
 } u`gy1t `  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); mXz-#Go(  
} $Fc*^8$ryC  
 42Gr0+Mb  
BOOL InitHotkey() ? RB~%^c!  
{ ]B3 0d  
 if(hHook!=NULL){ 5}*aP  
  nHookCount++; D4Uz@2_  
  return TRUE; > :!faWX  
 } lr+Kwve  
 else $SG^, !!&A  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); qq[2h~6P]  
  if(hHook!=NULL) }!Qo wG   
   nHookCount++;  Tx/  
  return (hHook!=NULL);  Ca@[]-_H  
} >]T(}S~  
BOOL UnInit() +3s i=x\=/  
{ [5)1 4% x  
 if(nHookCount>1){ :&6QKTX  
  nHookCount--; &5(|a"5+G  
  return TRUE; gLl?e8[F  
 } pF K[b  
 BOOL unhooked = UnhookWindowsHookEx(hHook); z+PSx'#}  
 if(unhooked==TRUE){ Hi,_qlc+  
  nHookCount=0; D<L]'  
  hHook=NULL; y<BiR@%,7  
 } A{x &5yX8  
 return unhooked; ]8+%57:E  
} +**H7: bO  
^T(l3r  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 9^v|~f  
{ "Z &qOQg%3  
 BOOL bAdded=FALSE; ^yy\CtG  
 for(int index=0;index<MAX_KEY;index++){ ?7^('  
  if(hCallWnd[index]==0){ .N_0rPO,Kw  
   hCallWnd[index]=hWnd; kzJNdYtdH  
   HotKey[index]=cKey; jt Q2vJ-  
   HotKeyMask[index]=cMask; |A'8'z&q  
   bAdded=TRUE; ^=OjsN  
   KeyCount++;  t Z\  
   break; f:Nfw+/q  
  } F m h;d*IT  
 } Q`5jEtu#,  
 return bAdded; UQ'D-eK  
} %CF(SK2w  
-T4?5T_  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) :/~`"`#1  
{ Haj`mc!<D0  
 BOOL bRemoved=FALSE; >bz}IcZP  
 for(int index=0;index<MAX_KEY;index++){ IJS9%m#  
  if(hCallWnd[index]==hWnd){ }`5%2iG  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ fAUtqkB  
    hCallWnd[index]=NULL; "uTzmm$  
    HotKey[index]=0; .}SW`R Pk  
    HotKeyMask[index]=0; fhMtnh:  
    bRemoved=TRUE; Bq79Ev .-  
    KeyCount--; ptb t  
    break; %?X~,  
   } j,6dGb  
  } q$:T<mFK$  
 } nHD4J;l  
 return bRemoved; F3H)B:  
} pA(@gisg  
6/nhz6=  
void VerifyWindow() <G2;nvRr  
{ 3t68cdFlz  
 for(int i=0;i<MAX_KEY;i++){ 2~R"3c+^  
  if(hCallWnd!=NULL){ Z(/jQ=ozQ  
   if(!IsWindow(hCallWnd)){ vB/MnEKR  
    hCallWnd=NULL; ua`2 & ;T=  
    HotKey=0; ouVR[w>V  
    HotKeyMask=0; kn+`2-0  
    KeyCount--; jl3RE|M\<  
   } ;OPzT9  
  } ws?p2$Cla  
 } }(op;7  
} U+~0m!|4  
{(ey!O  
BOOL CHookApp::InitInstance() uO,90g[C/R  
{ 3<m"z9$  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); HQ/PHUg2  
 hins=AfxGetInstanceHandle(); TeHL=\L-^  
 InitHotkey(); lG%oqxJ+ L  
 return CWinApp::InitInstance(); `o/tpuI  
} <\X4_sdy  
1ReO.Dd`R  
int CHookApp::ExitInstance() 9WtTUk  
{ %9{4g->  
 VerifyWindow(); mOGcv_L  
 UnInit(); BI4 p3-  
 return CWinApp::ExitInstance(); uZm<:d2%)  
} ^L]+e  
2NIK0%6  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ;oob TW{  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) saU|.\l  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ H'?Bx>X  
#if _MSC_VER > 1000 -("79v>#  
#pragma once Pa0tf:  
#endif // _MSC_VER > 1000 |= N8X  
s67$tlV  
class CCaptureDlg : public CDialog ;Qk*h'}f  
{ Rp}6}4=d  
 // Construction d cPh @3  
 public: @_1$ <8  
  BOOL bTray; V)!Oss;i  
  BOOL bRegistered; =J0FT2 d  
  BOOL RegisterHotkey(); D rHMlk5  
  UCHAR cKey; LeQ2,/7l:  
  UCHAR cMask; !*C^gIQGU  
  void DeleteIcon(); 8 l}tYl`|  
  void AddIcon(); | 2p\M?@  
  UINT nCount; 8{%/!ylJz  
  void SaveBmp(); N7+K$)3  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 0)k%nIhj  
  // Dialog Data 4?jhZLBU  
  //{{AFX_DATA(CCaptureDlg) OaU} 9&  
  enum { IDD = IDD_CAPTURE_DIALOG }; rZ:  
  CComboBox m_Key; ?kE2 S6j5  
  BOOL m_bControl; *=^_K`y  
  BOOL m_bAlt; I[tU}ojP  
  BOOL m_bShift; !Aunwq^  
  CString m_Path; }-: d*YtK  
  CString m_Number; () b0Sh=  
  //}}AFX_DATA =*8"ci $  
  // ClassWizard generated virtual function overrides 1PLKcU  
  //{{AFX_VIRTUAL(CCaptureDlg) ~z32%k  
 public: >=C)\Yfu)  
  virtual BOOL PreTranslateMessage(MSG* pMsg); XRP/E_4  
 protected: a ^4(7  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support d@,q6R}!MP  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); JXUO?9  
  //}}AFX_VIRTUAL hl6al:Y  
  // Implementation C:EF(/>+-  
 protected: I?bL4u$\  
  HICON m_hIcon; %b@>riR(y  
  // Generated message map functions LO# {   
  //{{AFX_MSG(CCaptureDlg) rLh490@  
  virtual BOOL OnInitDialog(); ,_\h)R_  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); <0v'IHlZ8  
  afx_msg void OnPaint(); .N/4+[2p(  
  afx_msg HCURSOR OnQueryDragIcon(); /~g M,*  
  virtual void OnCancel(); R;I}#b cJ  
  afx_msg void OnAbout(); 6<rc]T'|  
  afx_msg void OnBrowse(); "i_tO+  
  afx_msg void OnChange(); iLv"ZqGrw  
 //}}AFX_MSG ^4 es  
 DECLARE_MESSAGE_MAP() 05|t  
}; pA+Qb.z5z  
#endif -lb}}z+/  
X903;&Cim  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file oDKgW?x  
#include "stdafx.h" #z~D1Zl  
#include "Capture.h" .(1=iL_3e  
#include "CaptureDlg.h" <C${1FO7If  
#include <windowsx.h> ?G!^ |^S*  
#pragma comment(lib,"hook.lib") `n5RDz/f0  
#ifdef _DEBUG z0g$+bhy  
#define new DEBUG_NEW }@ 1LFZx  
#undef THIS_FILE ^Ud`2 OW;2  
static char THIS_FILE[] = __FILE__; tet  
#endif "TN}=^A\F  
#define IDM_SHELL WM_USER+1 ,,fLK1  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Rg0\Ng4|G  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 2S!=2u+7  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; e|+uLbN&;c  
class CAboutDlg : public CDialog Sq(=Bn6E  
{ K{q(/>:  
 public: a`/[\K6  
  CAboutDlg(); "UVV/&`o  
  // Dialog Data t@4X(i0  
  //{{AFX_DATA(CAboutDlg) 1DZGb)OU  
  enum { IDD = IDD_ABOUTBOX }; - VR u^l#  
  //}}AFX_DATA TN/I(pkt1B  
  // ClassWizard generated virtual function overrides L d#  
  //{{AFX_VIRTUAL(CAboutDlg) 9&rn3hmP  
 protected: b-~`A;pr  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support :4(7W[r6  
  //}}AFX_VIRTUAL mUnn k`v  
  // Implementation yKDg ~zsh  
 protected: ]S;e#u{QE  
  //{{AFX_MSG(CAboutDlg) }c&Zv#iO6  
  //}}AFX_MSG $5il]D`  
  DECLARE_MESSAGE_MAP() [0)iY%^  
}; eYsO%y\I  
W{ Nhh3  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) '-W p|A  
{ Y;-"Z  
 //{{AFX_DATA_INIT(CAboutDlg) zg8m(=k'  
 //}}AFX_DATA_INIT {/R4Q1  
} NbkWy  
|$bZO`^  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) |6_<4lmTxF  
{ 3@6f%Dyj  
 CDialog::DoDataExchange(pDX); @jwUH8g1  
 //{{AFX_DATA_MAP(CAboutDlg) 6 D!,vu  
 //}}AFX_DATA_MAP ;]<$p[m  
} Kpj0IfC,10  
d*q _DV  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) li/O&@g`  
 //{{AFX_MSG_MAP(CAboutDlg) Q?[k>fu0  
 // No message handlers Z~$&h  
 //}}AFX_MSG_MAP zZ;tSKL  
END_MESSAGE_MAP() 7(gQ6?KsZ  
U%w-/!p  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) wond>m 3  
: CDialog(CCaptureDlg::IDD, pParent) ce+\D'q[  
{ 6pr}A  
 //{{AFX_DATA_INIT(CCaptureDlg) OaU$ [Z'8  
  m_bControl = FALSE; &?zJ|7rh@|  
  m_bAlt = FALSE; @iWIgL  
  m_bShift = FALSE; Q#:,s8TW[  
  m_Path = _T("c:\\"); &Hh%pY"  
  m_Number = _T("0 picture captured."); (`>4~?|+T  
  nCount=0; oX?2fu-  
  bRegistered=FALSE; FA4bv9:hi  
  bTray=FALSE; v,p/r )E  
 //}}AFX_DATA_INIT 9O}YtX2  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ,YH^jc  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); p1X lni%=  
} Ev$?c9*>  
\Sm.]=b r  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) [lyB@) 6.  
{ <V>vDno\  
 CDialog::DoDataExchange(pDX); tYmWze. j  
 //{{AFX_DATA_MAP(CCaptureDlg) S~Nx;sB  
  DDX_Control(pDX, IDC_KEY, m_Key); <niHJ*  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); '%K,A-7W  
  DDX_Check(pDX, IDC_ALT, m_bAlt); L & PhABZ  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); <([o4%  
  DDX_Text(pDX, IDC_PATH, m_Path); u!{P{C  
  DDX_Text(pDX, IDC_NUMBER, m_Number); nM}X1^PiK"  
 //}}AFX_DATA_MAP #C !8a  
} #kma)_X  
V3I&0P k  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) O a-Z eCq  
//{{AFX_MSG_MAP(CCaptureDlg) 9"MC<  
 ON_WM_SYSCOMMAND() oVmGZhkA@'  
 ON_WM_PAINT() |y;+xEl6  
 ON_WM_QUERYDRAGICON() "d.qmM  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ! daXF&q  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) oSy[/Y44a  
 ON_BN_CLICKED(ID_CHANGE, OnChange) +-8uIqZ  
//}}AFX_MSG_MAP CE*@CkC0z  
END_MESSAGE_MAP() ;t*45  
xj%h-@o6  
BOOL CCaptureDlg::OnInitDialog() b.ow0WYe  
{ (A(d]l  
 CDialog::OnInitDialog();  D&N5)  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ;QgJw2G  
 ASSERT(IDM_ABOUTBOX < 0xF000); =b9?r  
 CMenu* pSysMenu = GetSystemMenu(FALSE); npbNUKdz  
 if (pSysMenu != NULL) !;iySRZr  
 { skZxR5v3~L  
  CString strAboutMenu; WnHf)(J`"  
  strAboutMenu.LoadString(IDS_ABOUTBOX); \[Rh\v&  
  if (!strAboutMenu.IsEmpty()) cB?HMLbG>  
  {  >cSc   
   pSysMenu->AppendMenu(MF_SEPARATOR); Dc BTW+  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); A")B<BK  
  } jOEb1  
 } !:e}d+F  
 SetIcon(m_hIcon, TRUE); // Set big icon +J+]P\:  
 SetIcon(m_hIcon, FALSE); // Set small icon #^Sd r-   
 m_Key.SetCurSel(0); :ykQ[d`:|  
 RegisterHotkey(); +s_@964  
 CMenu* pMenu=GetSystemMenu(FALSE); B6=8cf"i  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); C=9|K`g5 R  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ~}wPiu,  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); P9Rq'u  
 return TRUE; // return TRUE unless you set the focus to a control &t%ICz&3  
} |\N[EM%.@  
9\Yj`,i5  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) - n11L  
{ n%Nf\z  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ]km8M^P  
 { (x?A#o>%  
  CAboutDlg dlgAbout; \JN<"/  
  dlgAbout.DoModal();  l R;<6  
 } 1 ht4LRFi  
 else nm\n\j~  
 { xNq&_oY7  
  CDialog::OnSysCommand(nID, lParam); 3- LO  
 } ~u}[VP  
} wm@1jLjrQ  
WWq)Cw R  
void CCaptureDlg::OnPaint() #2x\d  
{ ~Bj-n6QDE  
 if (IsIconic()) \? MuORg  
 { BflF*-s ^  
  CPaintDC dc(this); // device context for painting  bQ  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); (:E^} &A  
  // Center icon in client rectangle Jq?ai8  
  int cxIcon = GetSystemMetrics(SM_CXICON); |h6)p;`gc  
  int cyIcon = GetSystemMetrics(SM_CYICON); qj/ 66ak  
  CRect rect; Ct"h.rD]  
  GetClientRect(&rect); L>pP3[~DV  
  int x = (rect.Width() - cxIcon + 1) / 2; 6>bKlYl&9  
  int y = (rect.Height() - cyIcon + 1) / 2; o+6Y/6Xp@  
  // Draw the icon 1VJE+3  
  dc.DrawIcon(x, y, m_hIcon); ,n&Dg58K  
 } B.{0,b W?  
 else .hT^7|Jz[  
 { WY<ip<  
  CDialog::OnPaint(); OEZXV ;F  
 } <}i\fJX6  
} ng<|lsZd  
gEPCXf  
HCURSOR CCaptureDlg::OnQueryDragIcon() uOm fpgO  
{ c;(}Ih(#  
 return (HCURSOR) m_hIcon; ;k!Ej-(  
} rQ~%SUM7  
63F0Za}h  
void CCaptureDlg::OnCancel() \n+`~< i  
{ B>9D@fmzs  
 if(bTray) bjD0y cB[  
  DeleteIcon(); Xo]FOJ 5  
  CDialog::OnCancel(); d{9jd{ _#G  
} 7J0 PO}N  
s g6  
void CCaptureDlg::OnAbout() S{ fNeK  
{ C7)].vUN  
 CAboutDlg dlg; E%/E%9-7\  
 dlg.DoModal(); U .e Urzu  
} _3kAN .g  
iCz,|;w%  
void CCaptureDlg::OnBrowse() =o+t_.)N  
{ *B@<{x r  
 CString str; +a;: 7[%&  
 BROWSEINFO bi; Qv']*C[!z  
 char name[MAX_PATH]; nA%-<  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); -+O8v;aC'  
 bi.hwndOwner=GetSafeHwnd(); P]!eM(  
 bi.pszDisplayName=name; |A5]hL   
 bi.lpszTitle="Select folder"; gqG l>=.m  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; NV*t  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ,4EE9 ?J  
 if(idl==NULL) 5TzMv3;in2  
  return; ZTHr jW1  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ?4gYUEM#  
 str.ReleaseBuffer(); ~~wz05oRG  
 m_Path=str; 5k<HO_]  
 if(str.GetAt(str.GetLength()-1)!='\\') l|5ss{llR  
  m_Path+="\\"; *3. ]  
 UpdateData(FALSE); mlIc`GSI  
} 0 ,Bd,<3  
&({X9  
void CCaptureDlg::SaveBmp() ihs@ 'jh  
{ b:W]L3Z8  
 CDC dc; C 5)G^  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); o5AyJuS-u$  
 CBitmap bm; W}JJaZR*X  
 int Width=GetSystemMetrics(SM_CXSCREEN); njvmf*A?S  
 int Height=GetSystemMetrics(SM_CYSCREEN); 'B6D&xn'%&  
 bm.CreateCompatibleBitmap(&dc,Width,Height); wGb{O  
 CDC tdc; +F4xCz7f  
 tdc.CreateCompatibleDC(&dc); d]w*fn  
 CBitmap*pOld=tdc.SelectObject(&bm); u3c e\  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ><^A4s  
 tdc.SelectObject(pOld); tXPS@4F  
 BITMAP btm; W99Fb+$I  
 bm.GetBitmap(&btm); E~{-RZNK  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; /:C"n|P7Z  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); j3A+:KDn3n  
 BITMAPINFOHEADER bih; /I".n]  
 bih.biBitCount=btm.bmBitsPixel; uw;s](~E  
 bih.biClrImportant=0; H^'EY:|  
 bih.biClrUsed=0; "f5u2=7 }  
 bih.biCompression=0; VZw("a*TB  
 bih.biHeight=btm.bmHeight; >;0z-;k6  
 bih.biPlanes=1; N=:yl/M  
 bih.biSize=sizeof(BITMAPINFOHEADER); !"p,9  
 bih.biSizeImage=size; !4-NbtT  
 bih.biWidth=btm.bmWidth; Z`< +8e  
 bih.biXPelsPerMeter=0; _mFb+8C  
 bih.biYPelsPerMeter=0;  21w<8:Vg  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); I"Y?vj9]  
 static int filecount=0; _khQ  
 CString name; 7|"11^q  
 name.Format("pict%04d.bmp",filecount++); -XD\,y%zi  
 name=m_Path+name; D`,@EW].  
 BITMAPFILEHEADER bfh; C^l) n!fq  
 bfh.bfReserved1=bfh.bfReserved2=0; evtn/.kDR  
 bfh.bfType=((WORD)('M'<< 8)|'B'); O`rrg~6#  
 bfh.bfSize=54+size; &X +@,!  
 bfh.bfOffBits=54; sOVaQ&+y  
 CFile bf; #N,\c@Gy  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ,]20I _  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); PP$Ig2Q  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 1AA(qE  
  bf.WriteHuge(lpData,size); Yo(8mtYU  
  bf.Close(); i~k?k.t8  
  nCount++; qdUlT*fw  
 } $c  f?`k  
 GlobalFreePtr(lpData); hq\KSFP  
 if(nCount==1) x"_f$,:!  
  m_Number.Format("%d picture captured.",nCount); YHCXVu<.b  
 else y 0M&Bh  
  m_Number.Format("%d pictures captured.",nCount); ${e(#bvGZ  
  UpdateData(FALSE); tHhY1[A8m  
} 6S ]GSS<  
[yjC@docH  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) @AVx4,!>[  
{ VJuPC  
 if(pMsg -> message == WM_KEYDOWN) T73saeN  
 { [y>Q3UqN  
  if(pMsg -> wParam == VK_ESCAPE) /rJvw   
   return TRUE; 9.PY49|  
  if(pMsg -> wParam == VK_RETURN) AB+Zc ]  
   return TRUE; $3"0w   
 }  Zp]Bs  
 return CDialog::PreTranslateMessage(pMsg); dv@6wp:  
} 3/]J i^+  
!A!zG)Ue<  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) uA\A4  
{ O(WFjmHx  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ _BcB@a  
  SaveBmp(); OJkPlDym  
  return FALSE; ^!Bpev  
} ,gD30Pylz  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ mX,#|qLf  
 CMenu pop; "ZT=[&2  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); v-OGY[|97  
 CMenu*pMenu=pop.GetSubMenu(0); Ya\G/R  
 pMenu->SetDefaultItem(ID_EXITICON); _%<7!|"  
 CPoint pt; b*.)m  
 GetCursorPos(&pt); #v~zf@<KLB  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); |!IJ/ivEgw  
 if(id==ID_EXITICON) xp><7{  
  DeleteIcon(); ?55('+{l  
 else if(id==ID_EXIT) PS \QbA  
  OnCancel(); EA?:GtH  
 return FALSE; I~4 `NV0  
} bFJmXx&  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); "fz-h  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) y~U+MtSf#  
 AddIcon(); T|9Yo=UK%  
 return res; .8.ivfmJh  
} ) @))3  
?86h:9  
void CCaptureDlg::AddIcon() X(E f=:  
{ )Q7;)iPY#  
 NOTIFYICONDATA data; u'?t'I  
 data.cbSize=sizeof(NOTIFYICONDATA); @A$%baH0  
 CString tip; V 9=y@`;  
 tip.LoadString(IDS_ICONTIP); w&f29#i;b  
 data.hIcon=GetIcon(0); unjo&  
 data.hWnd=GetSafeHwnd(); f ( UcJx  
 strcpy(data.szTip,tip); Fi*6ud\n!  
 data.uCallbackMessage=IDM_SHELL; NW!e@;E+i  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Km\M /j|  
 data.uID=98; Uc7X)  
 Shell_NotifyIcon(NIM_ADD,&data); x1A^QIuxO  
 ShowWindow(SW_HIDE); y0A2{'w  
 bTray=TRUE; Z AZQFr'*  
} ?6uh^Qal  
oqE h_[.  
void CCaptureDlg::DeleteIcon() $OjsaE %  
{ i.K}(bo;b  
 NOTIFYICONDATA data; ]T zN*6o  
 data.cbSize=sizeof(NOTIFYICONDATA); a$9UUH-|  
 data.hWnd=GetSafeHwnd(); h3O5DP6~  
 data.uID=98; UPJgTN*  
 Shell_NotifyIcon(NIM_DELETE,&data); YXD1B`23  
 ShowWindow(SW_SHOW); Eb{TKz?  
 SetForegroundWindow(); SOP= X-6f  
 ShowWindow(SW_SHOWNORMAL); <<n8P5pXt  
 bTray=FALSE; F!aYK2  
} ~{+J~5!;<H  
t7)Y@gRy  
void CCaptureDlg::OnChange() S :(1=@  
{ qJISB7F[%O  
 RegisterHotkey(); ^Ko0zz|R/  
} [C7:Yg7  
.fQDj{  
BOOL CCaptureDlg::RegisterHotkey() TzX>d<x  
{ Vvv -f  
 UpdateData(); }8x[  
 UCHAR mask=0; Ep0Aogp29  
 UCHAR key=0; N}Q,  
 if(m_bControl) C-4I e  
  mask|=4; b\^Sz{  
 if(m_bAlt) )OjbmU!7  
  mask|=2; UDp"+nS  
 if(m_bShift) K8e>sU.  
  mask|=1; |wK)(s  
  key=Key_Table[m_Key.GetCurSel()]; CGv(dE,G&]  
 if(bRegistered){ [nG/>Z]W  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); iW |]-Ba\  
  bRegistered=FALSE; Az0Yt31=  
 } j}h50*6KO  
 cMask=mask; a&Z|3+ZA  
 cKey=key; m=%W<8[V  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 94K ;=5h  
 return bRegistered; (y(V,kXwa8  
} TXrC5AJx  
oZOFZ-<  
  四、小结 s'/.ea V_  
S:^Q(w7  
  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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