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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: d#6'dKV$  
  5RD\XgyN]  
  一、实现方法 .cJWYMC  
R1u1  
  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: )D?\ru H  
T5(]/v,UT  
#pragma data_seg("shareddata") 'i#m%D`dt  
HHOOK hHook =NULL; //钩子句柄 |>(d^<nR^v  
UINT nHookCount =0; //挂接的程序数目 t4>%<'>e  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 A82Bn|J  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 hqOy*!8'@  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey "5Orj*{  
static int KeyCount =0; %v 0 I;t  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 6 B>1"h%Wf  
#pragma data_seg() jSNUU.lur  
szW_cjS  
  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。 b/65Q&g'  
~$xLR/{y  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: WxwSb`U|  
_EMq"\ND  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR g#b[-)Qx  
cKey,UCHAR cMask) ) in hPd  
{ FaS}$-0  
 BOOL bAdded=FALSE; ti$d.Kc(  
 for(int index=0;index<MAX_KEY;index++){ )pELCk  
  if(hCallWnd[index]==0){ 6apK]PT  
   hCallWnd[index]=hWnd; 7 $AEh+f  
   HotKey[index]=cKey; ernZfd{H  
   HotKeyMask[index]=cMask; 9ReH@5_bGM  
   bAdded=TRUE; Sz4G,c  
   KeyCount++; g_'F(An  
   break; r,F~Vwa}  
  } "BSSA%u?c  
 } i Lr*W#E  
 return bAdded; 1UG5Q-  
} p4mlS  
//删除热键 -XNjyXm2  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) {KkP"j'7h  
{ =[{YI2S  
 BOOL bRemoved=FALSE; 78a!@T1#  
 for(int index=0;index<MAX_KEY;index++){ )\fAy  
  if(hCallWnd[index]==hWnd){ Zq wxi1  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ S ykblP37  
    hCallWnd[index]=NULL; 6;"^Id  
    HotKey[index]=0; Ucnj7>+"  
    HotKeyMask[index]=0; wV\;,(<x=%  
    bRemoved=TRUE; qIEe7;DO  
    KeyCount--; xe ng`!  
    break; 1NJ,If]  
   } [4Tiukk(  
  } 5cLq6[uO  
 }  Z|zyO-  
 return bRemoved; `-qRZh@E  
} ACQbw)tiv}  
m?LnO5Vs  
` @.  
  DLL中的钩子函数如下: LvP{"K;   
|KSd@   
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) N$#518  
{ 4-l G{I_S:  
 BOOL bProcessed=FALSE; 9e^HTUFbG  
 if(HC_ACTION==nCode) $x_6 .AOZ,  
 { _m3}0q  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ch2Qk8  
   switch(wParam) llG^+*Y8t  
   {  .-Y3oWV  
    case VK_MENU: !=%E&e]  
     MaskBits&=~ALTBIT; wkSIQL  
     break; QUa_gYp0v  
    case VK_CONTROL: g-B~" tp  
     MaskBits&=~CTRLBIT; `>M;f%s  
     break; c6zghP3dR  
    case VK_SHIFT: ki/xo^Y2<  
     MaskBits&=~SHIFTBIT; ERSo&8  
     break; s-^B)0T!  
    default: //judge the key and send message 88c-K{} 3  
     break; 2 de[ yz  
   } 0XwDk$l<  
   for(int index=0;index<MAX_KEY;index++){ :|%dV}j  
    if(hCallWnd[index]==NULL) 'EF\=o)^Y  
     continue; ~~J xw ]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &+t! LM  
    { w.s-T.5.j  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ~pM\]OC  
     bProcessed=TRUE; \ ) H}  
    } NpS*]vSO  
   } V?KACYd@O  
  } 8NY $Iw  
  else if((lParam&0xc000ffff)==1){ //有键按下 9rhIDA(wc  
   switch(wParam) N^,@s"g  
   { w]n ,`r^  
    case VK_MENU: %3v:c|r  
     MaskBits|=ALTBIT; G/Ll4 :  
     break; B+e$S%HV  
    case VK_CONTROL: u$T`Bn  
     MaskBits|=CTRLBIT; Vp3r  
     break; |Ld/{&Qr  
    case VK_SHIFT: 6k?,'&z|~  
     MaskBits|=SHIFTBIT; z}XmRc_Ko  
     break; D$k<<dvv  
    default: //judge the key and send message >:5^4/fo*  
     break; Vs>/q:I  
   } <sXmk{  
   for(int index=0;index<MAX_KEY;index++){ w&6c`az8  
    if(hCallWnd[index]==NULL) $L|YllD%  
     continue; Koh`|]N  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) i21ybXA=Z  
    { uc6;%=%+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); x9fNIuAQ  
     bProcessed=TRUE; Q)"L8v v  
    } e;LJdd  
   } WJH)>4M#  
  } U}9B wr^  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 a3o4> 9  
   for(int index=0;index<MAX_KEY;index++){ hg8gB8Xq  
    if(hCallWnd[index]==NULL) t\[aU\4-7  
     continue; ] r8 hMv  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) " oWiQ{\IP  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); <28L\pdG`  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 qw]:oh&G  
   } ,~ ;_ -  
  } P38D-fLq  
 } yc|j]?  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); eUiJl6^x  
} Z1V%pg>]*  
x --buO  
  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: Q~/TqG U  
>s\j/yM  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); KEfn$\  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 5o2W[<%v  
TF)OBN~/  
  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: &?.k-:iN  
h/9{E:ML  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 4J lB\8rc  
{ l.tNq$3pS  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) yHvF"4]  
 { 6>I{Ik@>  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 7_$Xt)Y{  
  SaveBmp(); H^Th]-Zl  
  return FALSE; n}8J-/(|+  
 } m @K5eh  
 …… //其它处理及默认处理 y  @&Cn  
} ym,UJs&  
n<C4-'^U[a  
idL6*%M  
  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。 ~b}@*fq  
8FY.u{93  
  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。 XqD/~_z;  
}*+?1kv  
  二、编程步骤 {fsU(Jj\  
~WS;)Q0|  
  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"; >BC?% |l  
oH/6  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; W_z2Fs"A  
+ V:P-D  
  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; E;l|I A/7  
[qhQj\cK  
  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; ~T<yp  
EC6&#)g;CO  
  5、 添加代码,编译运行程序。  Lb# e  
,3^gB,ka  
三、程序代码 0>#or$:6E  
"tu BfA+f  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 11Kbj`sRZ  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) |R Ux)&  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ u(ep$>[F#_  
#if _MSC_VER > 1000 ]lj,GD)c  
#pragma once -eKi}e  
#endif // _MSC_VER > 1000 FI,>v`  
#ifndef __AFXWIN_H__ E}U[VtaC  
#error include 'stdafx.h' before including this file for PCH &m=Xg(G~c  
#endif hdB.u^!  
#include "resource.h" // main symbols m2o*d$Ke  
class CHookApp : public CWinApp klC;fm2C  
{ ["|' f  
 public: #*^vd{fl  
  CHookApp(); =3rPE"@,[  
  // Overrides oiP8~  
  // ClassWizard generated virtual function overrides \I r&&%  
  //{{AFX_VIRTUAL(CHookApp) y~)rZ-eSB  
 public: Eq>3|(UT  
  virtual BOOL InitInstance(); w_30g6tA  
  virtual int ExitInstance(); ]w!gv /;  
  //}}AFX_VIRTUAL ,fS}c pV  
  //{{AFX_MSG(CHookApp) 3`@alhD'  
  // NOTE - the ClassWizard will add and remove member functions here. (eS/Q%ZGK  
  // DO NOT EDIT what you see in these blocks of generated code ! KjR^6v  
  //}}AFX_MSG FYIzMp.4  
  DECLARE_MESSAGE_MAP() v,t&t9}/  
};  SJY<#_b  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); R["2kEF  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 5m,{?M`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); J[ 9yQ  
BOOL InitHotkey(); D[.; H)V  
BOOL UnInit(); Tjo K]]  
#endif "kC uCc  
[jl'5ld  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Uf^zA/33  
#include "stdafx.h" 5ru&In&  
#include "hook.h" C2GF N1i  
#include <windowsx.h> h>v;1Q O9D  
#ifdef _DEBUG :O:Rfmr~  
#define new DEBUG_NEW /s.O3x._'  
#undef THIS_FILE 4^1B'>I  
static char THIS_FILE[] = __FILE__; FY%v \`@1*  
#endif i3I'n*  
#define MAX_KEY 100 S4]}/Imn)  
#define CTRLBIT 0x04 g0ec-  
#define ALTBIT 0x02 YDBQ6X  
#define SHIFTBIT 0x01 yYmV^7G  
#pragma data_seg("shareddata") X+;F5b9z  
HHOOK hHook =NULL; xEBiBsk d  
UINT nHookCount =0; V$u~}]z  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey @-dM'R6C  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Q+/:5Z C  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey {~DYf*RZ  
static int KeyCount =0; xao'L  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift \-k X-Tq  
#pragma data_seg() h4C DZ  
HINSTANCE hins; r(`;CY]@  
void VerifyWindow(); wD>tR SW  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) SX)giQLU  
//{{AFX_MSG_MAP(CHookApp) c)8V^7=Q  
// NOTE - the ClassWizard will add and remove mapping macros here. A:Z$i5%'  
// DO NOT EDIT what you see in these blocks of generated code! 3ThCY`  
//}}AFX_MSG_MAP @ mm*S:Gt#  
END_MESSAGE_MAP() loVUB'OSv  
eCB(!Y|  
CHookApp::CHookApp() a p-\R  
{ 2 g"_ *[  
 // TODO: add construction code here, 910Ym!\{:  
 // Place all significant initialization in InitInstance O[Xl*9P  
} b#0y-bR  
j`I[M6Qxh  
CHookApp theApp; 7sECbbJT  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 5Cxh >,k  
{ y3T- ^  
 BOOL bProcessed=FALSE; BcaMeb-Z  
 if(HC_ACTION==nCode) kR%bdN  
 { =T5vu~[J/e  
  if((lParam&0xc0000000)==0xc0000000){// Key up xz#;F ,`ZR  
   switch(wParam) zI/)#^SQ  
   { p2}$S@GD  
    case VK_MENU: <,qJ% kc  
     MaskBits&=~ALTBIT; dzDh V{  
     break; Eq-fR~< 9  
    case VK_CONTROL: grEmp9Q ?  
     MaskBits&=~CTRLBIT; lyiBRMiP|  
     break; MdK!Y  
    case VK_SHIFT: .J' 8d"+  
     MaskBits&=~SHIFTBIT; "'H$YhY]  
     break; w)-@?jN  
    default: //judge the key and send message jR7 , b5  
     break; BQVpp,]  
   } IdTeue  
   for(int index=0;index<MAX_KEY;index++){ fLK*rK^{"  
    if(hCallWnd[index]==NULL) nd 'K4q  
     continue; 2V(ye9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :kSA^w8  
    { =W)Fa6P3j(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); hGi"=Oud2  
     bProcessed=TRUE; MfUG@  
    } xkR--/f  
   } "- xm+7  
  } r{qM!(T  
  else if((lParam&0xc000ffff)==1){ //Key down SeAokz>  
   switch(wParam) uEQH6~\{Nl  
   { Tz.!  
    case VK_MENU: $Tu%dE(OF  
     MaskBits|=ALTBIT; wVk2Fr(  
     break; ]k Ls2? \  
    case VK_CONTROL: 0-"ps]X  
     MaskBits|=CTRLBIT; G1M}g8 ]h  
     break; ~k+"!'1  
    case VK_SHIFT: 2%0z PflT  
     MaskBits|=SHIFTBIT; v :]y#y  
     break; }xTTz,Oj$  
    default: //judge the key and send message x.ZV<tDi7  
     break; j Efrxlj  
   } .!0),KmkK  
   for(int index=0;index<MAX_KEY;index++) @K36?d]e  
   { V ~w(^;o@  
    if(hCallWnd[index]==NULL) pH.wCD:1n  
     continue; 6}mbj=E`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) " |RP_v2  
    { <4}zl'.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); /b,M492  
     bProcessed=TRUE; `L`*jA+_  
    } L*bUjR,C  
   } E^L  
  } |Hg)!5EJ  
  if(!bProcessed){ 9,Zg'4",d  
   for(int index=0;index<MAX_KEY;index++){ #6'oor X  
    if(hCallWnd[index]==NULL) Vnuz! 6.  
     continue; {'Nvs_{6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) `Bx3grZ 7&  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); p?X.I]=vRv  
   } i;xH  
  } BZEY^G  
 }  fI[tU(x  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); YIb5jK `  
} *%(8z~(\  
)0`;leli  
BOOL InitHotkey()  =IV_yor  
{  ])}{GW  
 if(hHook!=NULL){ 9'3%%o  
  nHookCount++; q a#Fa)g*  
  return TRUE; 6FG h=~{3,  
 } t ),~w,7(J  
 else &W fs6g  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); <&TAN L  
  if(hHook!=NULL) iZ#dS}VlJ  
   nHookCount++; Zoj.F  
  return (hHook!=NULL); :gDIGBK,  
} owZj Q  
BOOL UnInit() *#e%3N05_  
{ vn3<LQ]  
 if(nHookCount>1){ '#xxjhF^  
  nHookCount--; Rct|"k_"Ys  
  return TRUE; UBuk-tq  
 } ,WA7Kp9  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 1"A1bK  
 if(unhooked==TRUE){ 3sc5meSu'  
  nHookCount=0; G40,KCa  
  hHook=NULL; ;YNN)P%"  
 } \c>9f"jS_  
 return unhooked; eS fT +UL  
} C$ oY,A,  
ZgF-.(GV  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) _1hc^j  
{ 9>u2; 'Ls  
 BOOL bAdded=FALSE; &#v^y 3r  
 for(int index=0;index<MAX_KEY;index++){ A=!&2(  
  if(hCallWnd[index]==0){ "C.'_H!Ex  
   hCallWnd[index]=hWnd; xy46].x-  
   HotKey[index]=cKey; z*ZEw  
   HotKeyMask[index]=cMask; 2\l7=9 ]\3  
   bAdded=TRUE; pl Ii  
   KeyCount++; K CJ zE>  
   break; 1qbd6D|t  
  } (7`goi7M  
 } 'IBs/9=ZC  
 return bAdded; Dk|S`3  
} (~xFd^W9o  
&>0=v  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 5^cPG" 4@  
{ 'x<gC"0A  
 BOOL bRemoved=FALSE; X'.}#R1  
 for(int index=0;index<MAX_KEY;index++){ !1+L0,I6  
  if(hCallWnd[index]==hWnd){ l"RX`N@In  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ H`]nY`HYg  
    hCallWnd[index]=NULL; hJ.XG<?]$  
    HotKey[index]=0; 0vmMNF  
    HotKeyMask[index]=0; ~6.AE/ow  
    bRemoved=TRUE; fF[n?:VV  
    KeyCount--; |TF,Aj   
    break; \D?6_ ,O  
   } f}^}d"&F  
  } 3!Zd]1$  
 } ^~-i>gTD  
 return bRemoved; I !9u](\0  
} ]0by6hQ  
cf1Ve\(YGI  
void VerifyWindow() .3qaaXeH  
{ suj? e6  
 for(int i=0;i<MAX_KEY;i++){ GBtBmV/`  
  if(hCallWnd!=NULL){ '@2pOq  
   if(!IsWindow(hCallWnd)){ 5[`!\vCiZ  
    hCallWnd=NULL; \6)l(b;  
    HotKey=0; 5fv eQI~!  
    HotKeyMask=0; g[*+R9'  
    KeyCount--; #tN)OZA  
   } (S0MqX*  
  } jC ,foqL  
 } 4pV.R5:  
} tvP_LNMF  
f"xi7vJv!f  
BOOL CHookApp::InitInstance() jIK *psaV  
{ YKf,vHau  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); T({:Y. A;  
 hins=AfxGetInstanceHandle(); /u!I2DF  
 InitHotkey(); ,d)!&y  
 return CWinApp::InitInstance(); vrm[sP  
} K+dkImkh  
xU@YBzbk  
int CHookApp::ExitInstance() tS#EqMf&o  
{ LkMhS0?(T  
 VerifyWindow(); gsI"G  
 UnInit();  }XaO~]  
 return CWinApp::ExitInstance(); 1d7oR`qr  
} + htTrHjt  
c 6}d{B[  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file G5ebb6[+  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) b=:AFs{  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ N/DcaHFYo  
#if _MSC_VER > 1000 yJWgz`/L  
#pragma once 15r,_Gp8  
#endif // _MSC_VER > 1000 hdW",Bf'  
)^ R]3!v  
class CCaptureDlg : public CDialog Zq2dCp%  
{ 24Z7;'  
 // Construction %Z 9<La  
 public: !e&ZhtTuC  
  BOOL bTray; `Q1S8i$  
  BOOL bRegistered; ;{ XKZ}  
  BOOL RegisterHotkey(); =`xk|86f  
  UCHAR cKey; iN0pYqY*  
  UCHAR cMask; ?}m/Q"!1  
  void DeleteIcon(); WfBA5  
  void AddIcon(); apa~Is1  
  UINT nCount; 7S7gU\qOj  
  void SaveBmp(); /S$p_7N  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor <(6@l@J|6  
  // Dialog Data 699z@>$}  
  //{{AFX_DATA(CCaptureDlg) Z8(1QU,~2  
  enum { IDD = IDD_CAPTURE_DIALOG }; = PcmJG]  
  CComboBox m_Key; "BK'<j^q  
  BOOL m_bControl; Q mOG2  
  BOOL m_bAlt; t]P[>{y  
  BOOL m_bShift; <>A:Oi3^  
  CString m_Path; a k@0M[d  
  CString m_Number; @j`_)Y\  
  //}}AFX_DATA oR5hMu;j+  
  // ClassWizard generated virtual function overrides Z{EHV7  
  //{{AFX_VIRTUAL(CCaptureDlg) f*Xonb  
 public: i?z3!`m  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Kw3fpNd  
 protected: &Sj<X`^  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support .S`Ue,H  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); "Fy34T0N  
  //}}AFX_VIRTUAL >J[g)$,  
  // Implementation >"f,'S5*  
 protected: BXO(B'1)]  
  HICON m_hIcon; VE& ?Zd~  
  // Generated message map functions >{~W"  
  //{{AFX_MSG(CCaptureDlg) =<_xUh.  
  virtual BOOL OnInitDialog(); Ra'0 ^4t  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); K0@2>nR  
  afx_msg void OnPaint(); z) yUBcq  
  afx_msg HCURSOR OnQueryDragIcon(); [N$da=`wv  
  virtual void OnCancel(); `mQY%p|  
  afx_msg void OnAbout(); U;D!m+.HK  
  afx_msg void OnBrowse(); [Oxmg?W  
  afx_msg void OnChange(); yX,2`&c  
 //}}AFX_MSG l\- 1W2  
 DECLARE_MESSAGE_MAP() 3uwu}aw  
}; Z_QSVH68A  
#endif 4HVZ;,q  
Lt8chNi [  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file XASoS5  
#include "stdafx.h" lJi'%bOi  
#include "Capture.h" 4-eb&  
#include "CaptureDlg.h" 0L $v7, 5  
#include <windowsx.h> ZO2u[HSO>  
#pragma comment(lib,"hook.lib") *!,+%0  
#ifdef _DEBUG i5?)E7-  
#define new DEBUG_NEW }pbyC  
#undef THIS_FILE {q~Bss{z  
static char THIS_FILE[] = __FILE__; )UI$ s"  
#endif /wK5YN.em  
#define IDM_SHELL WM_USER+1 [`_&d7{-4b  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 6`]R)i]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); v'a]SpE5  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; |A8Ar7)  
class CAboutDlg : public CDialog =   
{ O_ nk8  
 public: @/lLL GrZ"  
  CAboutDlg(); W,`u5gbT  
  // Dialog Data J#L-Slav%  
  //{{AFX_DATA(CAboutDlg) o$'Fz[U  
  enum { IDD = IDD_ABOUTBOX }; >-r\]/^  
  //}}AFX_DATA KZ6}),p  
  // ClassWizard generated virtual function overrides j1N1c~2  
  //{{AFX_VIRTUAL(CAboutDlg) *qAF#  
 protected: }; +'  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support >Gk<[0U  
  //}}AFX_VIRTUAL >@[`,  
  // Implementation U`,&Q ]  
 protected: i)1E[jc{p!  
  //{{AFX_MSG(CAboutDlg) s24-X1d(9  
  //}}AFX_MSG f62z9)`^  
  DECLARE_MESSAGE_MAP() mq[(yR  
}; WHBQA\4  
ZFOYYht  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) UG s <<  
{ z tHGY  
 //{{AFX_DATA_INIT(CAboutDlg) &jl'1mZ  
 //}}AFX_DATA_INIT :@wO' o  
} iH9g5G`O  
$ N5VoK  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) k)'hNk"x  
{ iv?'&IUfK  
 CDialog::DoDataExchange(pDX); i 6kW"5t  
 //{{AFX_DATA_MAP(CAboutDlg) iVd*62$@$  
 //}}AFX_DATA_MAP MnO,Cd6{%d  
} ^8o'\V"m^  
/1h`O@VA  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) m`g%\o^6i  
 //{{AFX_MSG_MAP(CAboutDlg) #KXazZu"  
 // No message handlers Y6`9:97  
 //}}AFX_MSG_MAP r9uY ?M  
END_MESSAGE_MAP() Gs7mO  
Mw?nIIu(@  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) C0jmjZ%w@  
: CDialog(CCaptureDlg::IDD, pParent) uwj/]#`  
{ wHBkaPO!  
 //{{AFX_DATA_INIT(CCaptureDlg) a { L`C"rJ  
  m_bControl = FALSE; K-)*S\<}  
  m_bAlt = FALSE; 5hB&]6n  
  m_bShift = FALSE; ~B:Lai4"  
  m_Path = _T("c:\\"); DvG.G+mo#  
  m_Number = _T("0 picture captured."); req=w;E:  
  nCount=0; ?f1%)]>   
  bRegistered=FALSE; H#E   
  bTray=FALSE; 6ApW+/  
 //}}AFX_DATA_INIT bS&'oWy*B  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 N(dn"`8  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); blid* @-  
} 3LG}x/l  
EX>>-D7L  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) rzDqfecOmW  
{ [{Fr{La`D'  
 CDialog::DoDataExchange(pDX); $.QnM  
 //{{AFX_DATA_MAP(CCaptureDlg) H+F?)VX}oA  
  DDX_Control(pDX, IDC_KEY, m_Key); 1HN_  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); DOkEWqM!  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 7WiVor$g-  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); y`E2IE2o  
  DDX_Text(pDX, IDC_PATH, m_Path); L(PJ9wjkD  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 1UJ(._0hR  
 //}}AFX_DATA_MAP vPi\ v U{  
} ( ]AErz+  
T?) U|  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ~r]ZD)  
//{{AFX_MSG_MAP(CCaptureDlg) )3.udx  
 ON_WM_SYSCOMMAND() 6O"Vy  
 ON_WM_PAINT() 'M_8U0k  
 ON_WM_QUERYDRAGICON() <eO 7b6_  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) F@ZG| &  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 69cOdIt^D  
 ON_BN_CLICKED(ID_CHANGE, OnChange) t}cj8DC!  
//}}AFX_MSG_MAP BC(f1  
END_MESSAGE_MAP() ]gI XG`  
, ZD!Qb  
BOOL CCaptureDlg::OnInitDialog() YM 7P!8Gc  
{ U @|{RP  
 CDialog::OnInitDialog(); 8hQ"rrj+  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); #Q^mdv?  
 ASSERT(IDM_ABOUTBOX < 0xF000); |O+R%'z'<  
 CMenu* pSysMenu = GetSystemMenu(FALSE); .W,< ]L '  
 if (pSysMenu != NULL) (+Gd)iO  
 { 8<^[xe  
  CString strAboutMenu; \&R}JK  
  strAboutMenu.LoadString(IDS_ABOUTBOX); vW"x)~B  
  if (!strAboutMenu.IsEmpty()) 1Lqs>*  
  { (-B0fqh=G  
   pSysMenu->AppendMenu(MF_SEPARATOR); tOnaD]J  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); :lgIu .  
  } IhM-a Y y5  
 } MG8-1M  
 SetIcon(m_hIcon, TRUE); // Set big icon ^[&*B#(  
 SetIcon(m_hIcon, FALSE); // Set small icon 6du"^g  
 m_Key.SetCurSel(0); s_zZ@azJ  
 RegisterHotkey(); Y91TF'  
 CMenu* pMenu=GetSystemMenu(FALSE); xtpD/,2  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); XwX1i!'54  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); "y "C#:5  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); hYi-F.Qtq  
 return TRUE; // return TRUE unless you set the focus to a control Z6K9E=%)c  
} d^ipf*aLC  
x[WT)  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) |8`}yRsQ  
{ tI.(+-q  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) g|)e3q{M  
 { (niZN_qv  
  CAboutDlg dlgAbout; (cC5zv*E  
  dlgAbout.DoModal(); fN0D\Mu!)b  
 } aR}NAL_`w  
 else m"86O:S#d  
 { +(PtOo.  
  CDialog::OnSysCommand(nID, lParam); at7/KuY!~  
 } BAX])~_  
} bTO$B2eh|  
d`({z]W;  
void CCaptureDlg::OnPaint() *'d5~dz=  
{ IdzF<>;W  
 if (IsIconic()) %m+Z rH(  
 { +=\S"e[F  
  CPaintDC dc(this); // device context for painting SkvKzV.R;  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Cgq9~U !  
  // Center icon in client rectangle qpp:h_E  
  int cxIcon = GetSystemMetrics(SM_CXICON); :w:5;cm V  
  int cyIcon = GetSystemMetrics(SM_CYICON); 86R}G/>>e  
  CRect rect; <@F4{*  
  GetClientRect(&rect); A<>W^ow  
  int x = (rect.Width() - cxIcon + 1) / 2; p&vQ* }  
  int y = (rect.Height() - cyIcon + 1) / 2; Bfi9%:eG  
  // Draw the icon KC}B\~ +  
  dc.DrawIcon(x, y, m_hIcon); S:Yo9~  
 } BOt\"N  
 else /V7u0y  
 { AuO%F YKY  
  CDialog::OnPaint(); 07/5RFmJ  
 } -BEPpwb<g  
} QfcW  
gMHH3^\VH)  
HCURSOR CCaptureDlg::OnQueryDragIcon() 3vrQY9H>  
{ eRVu/TY  
 return (HCURSOR) m_hIcon; pKr3(5~  
} JXPn <  
@ o;m!CYB  
void CCaptureDlg::OnCancel() >x!N@G  
{ (&njZdcb*  
 if(bTray) Yd/qcC(&  
  DeleteIcon(); {W `/KU?u  
  CDialog::OnCancel(); X 8[T*L.  
} u6(7#n02  
Z>CFH9  
void CCaptureDlg::OnAbout() oL VtP  
{ azE>uEsE  
 CAboutDlg dlg; )>TA|W]@  
 dlg.DoModal(); ^e&,<+qY  
} :Bn\1\  
D+ jk0*bJ  
void CCaptureDlg::OnBrowse() {qOSs,+=L  
{ G1| Tu"  
 CString str; &qe:|M  
 BROWSEINFO bi; JpSS[pOg  
 char name[MAX_PATH]; SxOM@A  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 3FX` dZ  
 bi.hwndOwner=GetSafeHwnd(); N>]u;HjH  
 bi.pszDisplayName=name; q!O~*   
 bi.lpszTitle="Select folder"; V!ajD!00  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; (MxLw:AV  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 9wtl|s%A %  
 if(idl==NULL) Y~Jq!  
  return; $f)Y !<bC  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); \u)s Zh  
 str.ReleaseBuffer(); yM\ 1n  
 m_Path=str; 8, B9y D  
 if(str.GetAt(str.GetLength()-1)!='\\') Nc;7KMOIA  
  m_Path+="\\"; ](Sp0t  
 UpdateData(FALSE); xmVK{Q YT$  
} 8,['q~z  
FEdyh?$  
void CCaptureDlg::SaveBmp() c)E'',-J_2  
{ r)7A# 3wId  
 CDC dc; WX?|iw I~  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); qa%g'sB-b  
 CBitmap bm; CdEJ/G:  
 int Width=GetSystemMetrics(SM_CXSCREEN); B<0lif|  
 int Height=GetSystemMetrics(SM_CYSCREEN); [2&Fnmjk}X  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ]+@b=J2b  
 CDC tdc; lJU[9)Q_  
 tdc.CreateCompatibleDC(&dc); i$%V)pH~F  
 CBitmap*pOld=tdc.SelectObject(&bm); ;dPLi4=o  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); cuSXv)  
 tdc.SelectObject(pOld); A#8/:t1AW  
 BITMAP btm; 'etCIl3  
 bm.GetBitmap(&btm); xNm<` Y?  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; +'lfW{E1t  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Ex<-<tY  
 BITMAPINFOHEADER bih; kB  :")$  
 bih.biBitCount=btm.bmBitsPixel; fE^rTUtn  
 bih.biClrImportant=0; ){wE)NN  
 bih.biClrUsed=0; /8GVu7  
 bih.biCompression=0; >O?EFd>E  
 bih.biHeight=btm.bmHeight; RS$:]hxd>_  
 bih.biPlanes=1; hVR=g!e#X  
 bih.biSize=sizeof(BITMAPINFOHEADER); Ad`; O+/;  
 bih.biSizeImage=size; 3UH=wmG0w  
 bih.biWidth=btm.bmWidth; 9D 0ujup  
 bih.biXPelsPerMeter=0; g(<@r2p  
 bih.biYPelsPerMeter=0; NB, iC [e  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); W=G[hT5L{  
 static int filecount=0; KH[%HN5v  
 CString name; { >4exyu6  
 name.Format("pict%04d.bmp",filecount++); $/pd[H[{  
 name=m_Path+name; lYJ]W[!  
 BITMAPFILEHEADER bfh; Y> 7/>x6  
 bfh.bfReserved1=bfh.bfReserved2=0; LrK6*y,z  
 bfh.bfType=((WORD)('M'<< 8)|'B'); P/ug'  
 bfh.bfSize=54+size; A\ LTAp(I  
 bfh.bfOffBits=54; Ct.Q)p-wn  
 CFile bf; J#JZ^59lOS  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ AQ-PY  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); IcaF 4#  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); .}z&$:U9[  
  bf.WriteHuge(lpData,size); IJ=~hBI  
  bf.Close(); FC)aR[  
  nCount++; ogQbST  
 } 'rz*mR8  
 GlobalFreePtr(lpData); #X|'RL($  
 if(nCount==1) H!s &]b  
  m_Number.Format("%d picture captured.",nCount); 1Z*-@%RX  
 else OcIJT1  
  m_Number.Format("%d pictures captured.",nCount); B:SzCC.B  
  UpdateData(FALSE); 1_yUv7uhX  
} Ip<STz]-  
h05 ~ g  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) [kn`~hI  
{ oOSw> 23x  
 if(pMsg -> message == WM_KEYDOWN) sLB{R#Pt  
 { ;pC-0m0Y  
  if(pMsg -> wParam == VK_ESCAPE) ]Nm_<%lT  
   return TRUE; {mI95g&  
  if(pMsg -> wParam == VK_RETURN) E8)C_[QJ`  
   return TRUE; s>_ne0  
 } FIW*N r  
 return CDialog::PreTranslateMessage(pMsg); dGHRHXi  
} Ag}>gbz~G  
~ZL}j+L/  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) A;{8\e  
{ K);:+s-  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ N{E >R&,q  
  SaveBmp(); _H%ylAt1j  
  return FALSE; y"P$:l  
} *4WOmsj  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ L2Mcs  
 CMenu pop; f}#pKsX.  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); +EkZyM~z2  
 CMenu*pMenu=pop.GetSubMenu(0); $s?q>Z)  
 pMenu->SetDefaultItem(ID_EXITICON); @8DA  
 CPoint pt; 2j( w*k q~  
 GetCursorPos(&pt); m&o&XVC  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); PcJ,Y\"[  
 if(id==ID_EXITICON) ^<ayPV)+  
  DeleteIcon(); kOJs;k  
 else if(id==ID_EXIT) [UFLL:_sC  
  OnCancel(); fMhMB |W.  
 return FALSE; @hg1&pfxZ<  
} Elm/T]6  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); pdmeB  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) L?0dZY-"  
 AddIcon(); &]uhPx/  
 return res; ,mjwQ6:Ny  
} "r.pU(uxt  
%6*xnB?  
void CCaptureDlg::AddIcon() 1<ZvHv  
{ }vp\lK P  
 NOTIFYICONDATA data; <7u*OYjA  
 data.cbSize=sizeof(NOTIFYICONDATA); _ @ \  
 CString tip; !^B`7  
 tip.LoadString(IDS_ICONTIP); .4.zy]I  
 data.hIcon=GetIcon(0); 6 {5*9!v63  
 data.hWnd=GetSafeHwnd(); Z]"ktb;+[  
 strcpy(data.szTip,tip); `2Ff2D ^ ?  
 data.uCallbackMessage=IDM_SHELL; =yvyd0|35  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; kG\+f>XQ  
 data.uID=98; eK4\v:oG1  
 Shell_NotifyIcon(NIM_ADD,&data);  [T !#s  
 ShowWindow(SW_HIDE); Q%q_  
 bTray=TRUE; a?&oOQd-iP  
} jC<<S  
glPOW  
void CCaptureDlg::DeleteIcon() ym<G.3%1  
{ Z2hRTJJ[A  
 NOTIFYICONDATA data; 8?P@<Do%  
 data.cbSize=sizeof(NOTIFYICONDATA); .hBE&Y>\  
 data.hWnd=GetSafeHwnd(); HWD  
 data.uID=98; Oh-HfJyi  
 Shell_NotifyIcon(NIM_DELETE,&data); Vc c/  
 ShowWindow(SW_SHOW); StaX~J6=  
 SetForegroundWindow(); c7P"1  
 ShowWindow(SW_SHOWNORMAL); (g4.bbEm  
 bTray=FALSE; D.U)R7(  
} B9Y "J  
Sxf<8Px9i  
void CCaptureDlg::OnChange() zziujs:  
{ R:Z{,R+  
 RegisterHotkey(); Nn4<:2  
}  |Pwb7:a3  
[2.pZB  
BOOL CCaptureDlg::RegisterHotkey() 4k<4=E  
{ !<@k\~9^D  
 UpdateData(); B%cjRwOT  
 UCHAR mask=0; FZb\VUmnV  
 UCHAR key=0; A2$:p$[  
 if(m_bControl) w6v P a  
  mask|=4; p\1[cz)B  
 if(m_bAlt) /dh w~|  
  mask|=2; $w#C;2k]N  
 if(m_bShift) 8X[G)J;  
  mask|=1; vvFXdHP  
  key=Key_Table[m_Key.GetCurSel()]; ZKPnvL70  
 if(bRegistered){  :v8j3=  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); %/-Z1Nv*#  
  bRegistered=FALSE; >*B/Wy  
 } m3\lm@`)O  
 cMask=mask; 0KU,M+_  
 cKey=key; )z$VQ=]"  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); uFL~^vz  
 return bRegistered; 7*~ rhQ  
} w\8grEj  
Cf J@|Rh  
  四、小结 xG\&QE  
*ZF7m_8u{  
  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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