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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: C3]\$  
  dBsRm{aS  
  一、实现方法 2*N&q|ED  
Z3OZPxm  
  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: -/@|2!d  
CX1L(Y[  
#pragma data_seg("shareddata") 9Ilfv  
HHOOK hHook =NULL; //钩子句柄 lO%MyP  
UINT nHookCount =0; //挂接的程序数目 t `N ">c"  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 :y4)qF  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 cdd P T  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey =ZxW8 DK  
static int KeyCount =0; #9URVq,  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 xgZV0!%  
#pragma data_seg() xC= y^- 1  
45]Ym{]  
  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。 =x|##7  
WZfk}To1#  
  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: yBpW#1=  
)pkhir06t  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR jydp4ek_n  
cKey,UCHAR cMask) MzBfHt'Rk  
{ RTdD]pE8Q  
 BOOL bAdded=FALSE; Z!q2F%02FO  
 for(int index=0;index<MAX_KEY;index++){ 'w>uFg1.  
  if(hCallWnd[index]==0){ <Tj"GVZAEO  
   hCallWnd[index]=hWnd; hNu>s  
   HotKey[index]=cKey; G%V=idU*"  
   HotKeyMask[index]=cMask; d A_S"Zc  
   bAdded=TRUE; ;oN{I@}k  
   KeyCount++; ]# tGT0   
   break; EM>c%BH<N  
  } [TiT ff&LV  
 } SX1Fyy6 w  
 return bAdded; y9l#;<b  
} .{'Uvn  
//删除热键 pIU#c&%<9  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) $sd3h\P&R  
{ Pj1K  
 BOOL bRemoved=FALSE; :IP;Frc MP  
 for(int index=0;index<MAX_KEY;index++){ eR#gG^o8  
  if(hCallWnd[index]==hWnd){ 1j${,>4tQ  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ |k['wqn"  
    hCallWnd[index]=NULL; W<cW;mO  
    HotKey[index]=0; X:xC>4]gG'  
    HotKeyMask[index]=0; z[0LU]b<  
    bRemoved=TRUE; .,d$%lN  
    KeyCount--; 0`g}(}'L  
    break; IGF37';;  
   } Se;?j-  
  } rw=UK`  
 } *_"c! eW  
 return bRemoved; 82Z[eo  
} \>aa8LOe  
 "df13U"  
!~w6"%2+7  
  DLL中的钩子函数如下: (DEL xE  
QYf/tQg$  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) NbQMWU~7  
{ 4}r\E,`*X  
 BOOL bProcessed=FALSE; tLoD"/z  
 if(HC_ACTION==nCode) (to/9OrG  
 { 2RSHB o  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 3-_U-:2"  
   switch(wParam) `DWi4y7  
   {  CL<KBmW7  
    case VK_MENU: =?`y(k4a  
     MaskBits&=~ALTBIT;  n_xa)  
     break; ^NnU gj  
    case VK_CONTROL: r:8]\RU  
     MaskBits&=~CTRLBIT; mKf>6/s{c  
     break; &)"7am(S`  
    case VK_SHIFT: $@:>7Y"  
     MaskBits&=~SHIFTBIT; _A~~L6C  
     break; ;+TF3av0zq  
    default: //judge the key and send message tsSS31cv  
     break; :)+@qxTy  
   } QE{;M  
   for(int index=0;index<MAX_KEY;index++){ BhE~k?$9  
    if(hCallWnd[index]==NULL) faL^=CAe  
     continue; wTMHoU*>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) vElL.<..  
    { H>X>5_{}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); HA3SQ  
     bProcessed=TRUE; utm+\/  
    } WT ~dA95  
   } 2 Zjb/  
  } 9^ *ZH1  
  else if((lParam&0xc000ffff)==1){ //有键按下 cJ(zidf_$  
   switch(wParam) YL&b9e4  
   { :9rhv{6Wp  
    case VK_MENU: M5ySs\O4  
     MaskBits|=ALTBIT; X-ki%jp3  
     break; Zh~Lm  
    case VK_CONTROL: I}G}+0geV  
     MaskBits|=CTRLBIT; VqO<+~M,E  
     break; :'=~/GR  
    case VK_SHIFT: @IyH(J],h  
     MaskBits|=SHIFTBIT; I ;11j  
     break; L ugk`NUvF  
    default: //judge the key and send message LN3dp?;_{  
     break;  eS@!\H x  
   } "/K&qj  
   for(int index=0;index<MAX_KEY;index++){ U0bE B  
    if(hCallWnd[index]==NULL) f w>Gx9  
     continue; {@K2WB  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) eze(>0\f  
    { ";Ig%]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); [|;Zxb:  
     bProcessed=TRUE; C7 & 6rUX  
    } /&!d  
   } 4ysdna\+  
  } oQjB&0k4  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 +D-+}&oW  
   for(int index=0;index<MAX_KEY;index++){ w KMk|y>  
    if(hCallWnd[index]==NULL) DEwtP  
     continue; Q}f}Jf3P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) T# _n-b>  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); n\ ',F  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 >\oJ&gdc  
   } =UKR<@QrK  
  } rs<&x(=Hv  
 } SnF[mN'  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); hy&Hl  
} e %v4,8  
q~dg   
  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: &'ETx"  
.s*EV!SE  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 2"Uk}Yz|  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); tD0>(41K  
1 l*(8!_  
  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: ]3y5b9DuW  
56 kgL;$h  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) kRXg."b(  
{ 5eSTT#[+R  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) WKJL< D ]:  
 {  t-x"(  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ST8/ ;S#c  
  SaveBmp(); <^q"31f  
  return FALSE; "PScM9)\  
 } <W%Z_d&Xv  
 …… //其它处理及默认处理 utl=O  
} :E&T}RN  
?uX6X'-  
/Vd#q)b%T  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 /\$|D&e  
-+_aL4.  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 xPJJ !mY  
@ h`Zn1;  
  二、编程步骤 r~fl=2>yQ  
W#_gvW  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; mS&\m#s<  
8lGgp&ey  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; K}/`YDu  
W (c\$2`  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; *`pBQZn05O  
`&[:!U2]F  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; 8Y~T$Yj^  
d#:J\2V"R  
  5、 添加代码,编译运行程序。 wvaIgy%z  
UkbQ'P+oS  
三、程序代码 8[`<u[Iv  
V+~{a:8[pq  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL &Wz:-G7<n  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 9l_?n@   
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ |A/_Qe|s2  
#if _MSC_VER > 1000 t}+c/ C%b=  
#pragma once OSi9J.]O  
#endif // _MSC_VER > 1000 .LcE^y[V  
#ifndef __AFXWIN_H__ d]~1.i  
#error include 'stdafx.h' before including this file for PCH 'p+QFT>Ca  
#endif #&KE_ n  
#include "resource.h" // main symbols HFWm}vA:  
class CHookApp : public CWinApp rWpfAE)!  
{ VD`2lGdF  
 public: WvzvGT=  
  CHookApp(); = d.W'q|  
  // Overrides 3Il/3\  
  // ClassWizard generated virtual function overrides <G?85*Nv_  
  //{{AFX_VIRTUAL(CHookApp) QjN3j*@  
 public: 'wV26Dm  
  virtual BOOL InitInstance(); Ki;5 =)  
  virtual int ExitInstance(); \#7%%>p=O'  
  //}}AFX_VIRTUAL -+@~*$ d  
  //{{AFX_MSG(CHookApp) MJpTr5Vs  
  // NOTE - the ClassWizard will add and remove member functions here. zGz'2, o3  
  // DO NOT EDIT what you see in these blocks of generated code ! `|?$; )  
  //}}AFX_MSG f|1FqL+T]  
  DECLARE_MESSAGE_MAP() qA/ 3uA!z  
}; <%uZwk>#  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ~6i mkv^ F  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); S%#Mu|  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); <!XnUCtV  
BOOL InitHotkey(); sn`?Foh  
BOOL UnInit(); zb,`K*Z{  
#endif >.~k?_Of  
e ;r-}U  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. )?y"NVc*  
#include "stdafx.h" irj}:f;!eF  
#include "hook.h" &scD)  
#include <windowsx.h> ZaindX{.1  
#ifdef _DEBUG 9gayu<J  
#define new DEBUG_NEW 5z]KkPQ  
#undef THIS_FILE Ps4A B#3  
static char THIS_FILE[] = __FILE__; lfd{O7L0b  
#endif wk/U"@lq  
#define MAX_KEY 100 GQxJ (f  
#define CTRLBIT 0x04 )PNk O3  
#define ALTBIT 0x02 N Z9,9  
#define SHIFTBIT 0x01 }gaKO 5  
#pragma data_seg("shareddata") k-0e#"B  
HHOOK hHook =NULL; Y %8QFM  
UINT nHookCount =0; K%_JQ0`  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 5*Iz3vTq  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 1&E&8In]$r  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey D"5~-9<  
static int KeyCount =0; -bQvJ`iF  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift oC>~r 1.j  
#pragma data_seg() HXo'^^}q;  
HINSTANCE hins; wj~8KHan  
void VerifyWindow(); .AS,]*?Zn%  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Z6pDQ^Ii  
//{{AFX_MSG_MAP(CHookApp) PmTd+Gj$  
// NOTE - the ClassWizard will add and remove mapping macros here. X)5O@"4 ?  
// DO NOT EDIT what you see in these blocks of generated code! `?m(Z6'  
//}}AFX_MSG_MAP :7*\|2zA  
END_MESSAGE_MAP() (b!DJ;(O9  
$yJfAR  
CHookApp::CHookApp() gRSG[GMV  
{ aW5~z^I  
 // TODO: add construction code here, N`fY%"5U>  
 // Place all significant initialization in InitInstance kp"cHJNx  
} %)]RM/e8  
VlvDodV  
CHookApp theApp; qIp`'.#m  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) dq&d>f1  
{ [r'M_foga*  
 BOOL bProcessed=FALSE; " WL  
 if(HC_ACTION==nCode) ,pepr9Yd  
 { #k, kpL<a  
  if((lParam&0xc0000000)==0xc0000000){// Key up hG)lVo!L4j  
   switch(wParam) S?$T=[yY)  
   { UzXbaQQ2g  
    case VK_MENU: 1Btf)y'  
     MaskBits&=~ALTBIT; ~46ed3eGzi  
     break; 6 h):o  
    case VK_CONTROL: h#9)M  
     MaskBits&=~CTRLBIT; 6!N&,I  
     break; /8R1$7  
    case VK_SHIFT: rKxk?}  
     MaskBits&=~SHIFTBIT; X)S4rW%  
     break; 2(|V1]6D?  
    default: //judge the key and send message hBw~l?G  
     break; 2"T&Fp<  
   } uOx$@1v,  
   for(int index=0;index<MAX_KEY;index++){ f5v|}gMAX  
    if(hCallWnd[index]==NULL) %iNDRLR%I  
     continue; 6dp~19T^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &gfQZxT  
    { wVTo7o%U  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ~ln,Cm} 4  
     bProcessed=TRUE; :OM>z4mQ  
    } 3z<t#  
   } fA^O  
  } xM,3F jF  
  else if((lParam&0xc000ffff)==1){ //Key down vPi+8)  
   switch(wParam) WUWQcJj  
   { 60Z)AQs;+J  
    case VK_MENU: HT'dft #  
     MaskBits|=ALTBIT; #S5vX<"9  
     break; _ U\vHa$#  
    case VK_CONTROL: f&|SGD*  
     MaskBits|=CTRLBIT; ^B/{  
     break; |bh:x{h  
    case VK_SHIFT: |V& k1{V  
     MaskBits|=SHIFTBIT; UJI1n?~  
     break; K+Qg=vGY  
    default: //judge the key and send message d=pq+  
     break; q b'ka+X  
   } K67x.PZ  
   for(int index=0;index<MAX_KEY;index++) >jcNo3S  
   { Xo,BuK&G  
    if(hCallWnd[index]==NULL) S=Zjdbd  
     continue; 1JM~Ls%Z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) .Qaqkb-Ty  
    { -4;u|0_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); *\>7@r[%5  
     bProcessed=TRUE; 0|cQx VJb  
    } 1/z1~:Il  
   } t|/ /oEY  
  } 0y(d|;':  
  if(!bProcessed){ g7F>o76M  
   for(int index=0;index<MAX_KEY;index++){ Vj_ $%0  
    if(hCallWnd[index]==NULL) 4-o$OI>  
     continue; pq@ad\8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) e&:fzO<~I  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Wrlmo'31  
   }  QS!b]a3  
  } e2;"> tp6?  
 } Z^sO`C  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); r6A7}v  
} vUW!  
<J- aq;p  
BOOL InitHotkey() I++!F,pB  
{ 9 i"3R0HN  
 if(hHook!=NULL){ + }^  
  nHookCount++; Yd@9P 2C  
  return TRUE; P<bA~%<7"[  
 } C'{Z?M>  
 else k&Sg`'LG8  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 6A%Y/oU+2  
  if(hHook!=NULL) 2 `#|;x^<  
   nHookCount++; Y }0-&  
  return (hHook!=NULL); hM;EUWv  
} c;j]/R$i  
BOOL UnInit() S"lcePN  
{ *d@}'De{8  
 if(nHookCount>1){ 1 @/+ c  
  nHookCount--; $XJe)  
  return TRUE; __zsrIUJ  
 } a+MC[aFr  
 BOOL unhooked = UnhookWindowsHookEx(hHook); k(s3~S2h  
 if(unhooked==TRUE){ U\51j  
  nHookCount=0; /6>2,S8Ar  
  hHook=NULL; [}FP_Su$6  
 } `P'{HT  
 return unhooked; Y*4\K%e(  
} *rA!`e*  
7%aB>uA  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 7bTs+C_;7  
{ iK)w3S}k1y  
 BOOL bAdded=FALSE; 'A4Lr  
 for(int index=0;index<MAX_KEY;index++){ X2s=~)`#c  
  if(hCallWnd[index]==0){ 7^S&g.A  
   hCallWnd[index]=hWnd; Uq"RyvkpP  
   HotKey[index]=cKey; w2 CgEJ %  
   HotKeyMask[index]=cMask; bvAO(`  
   bAdded=TRUE; HgbJsv$  
   KeyCount++; WWD\EDnS  
   break; ~aBALD0D;  
  } #U'n=@U@(  
 } GK:*|jV  
 return bAdded; bw+~5pqM  
} 7kleBDDT  
&7}-Xvc  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ,VbP$1t  
{ ^8B#-9Ph b  
 BOOL bRemoved=FALSE; B>gC75  
 for(int index=0;index<MAX_KEY;index++){ VYvHpsI  
  if(hCallWnd[index]==hWnd){ {DAwkJvb]  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ }&ZO q'B  
    hCallWnd[index]=NULL; d[jxU/.p;  
    HotKey[index]=0; =TU"B-*  
    HotKeyMask[index]=0; ^-rb&kW@:  
    bRemoved=TRUE; ]l`?"X|^  
    KeyCount--; z9E*Mh(NE  
    break;  gryC#  
   } i $#bg^  
  } P 3);R>j  
 } H2[ S]`?  
 return bRemoved; y1FS?hSD0  
} u:<%!?  
9^>nZ6  
void VerifyWindow() ?;!l-Dy  
{ L/#^&*'B  
 for(int i=0;i<MAX_KEY;i++){ ,}F{V>dhn  
  if(hCallWnd!=NULL){ "m(HQ5e)*  
   if(!IsWindow(hCallWnd)){ UjUDP>iz.>  
    hCallWnd=NULL; r>A, 7{  
    HotKey=0;  pb6z)8  
    HotKeyMask=0; V(w2k^7) F  
    KeyCount--; [iB`- dE,  
   } cC b'z1  
  } ,accw}G  
 } XF'K dz>p  
} d 6j'[  
Em %"] B  
BOOL CHookApp::InitInstance() 8?J\  
{ _T)dmhG  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); U_B"B;ng+  
 hins=AfxGetInstanceHandle(); !ku5P+y$  
 InitHotkey(); h1q?kA  
 return CWinApp::InitInstance(); L1 O\PEeT  
} H<Ed"-n$I<  
xOp8[6Ga'  
int CHookApp::ExitInstance() ;gP@d`s  
{ XSkx<"U*  
 VerifyWindow(); -[^aWNqyJ  
 UnInit(); mtOCk 5E  
 return CWinApp::ExitInstance(); T&j_7Q\;vI  
} &J,MJ{w6"  
S{XV{o  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file gR )xw)!  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) .q"`)PT  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ^0Cr-  
#if _MSC_VER > 1000 Zx@/5!_n.  
#pragma once ]_G!(`Udh  
#endif // _MSC_VER > 1000 9~J  
ou0(C `  
class CCaptureDlg : public CDialog "u@)   
{ gf$5pp-  
 // Construction .BuXg<`  
 public: 1\X1G>60m  
  BOOL bTray; =$`EB  
  BOOL bRegistered; 8vjaQ5  
  BOOL RegisterHotkey(); eZ'J,;  
  UCHAR cKey; no~hYy W2  
  UCHAR cMask; RP?UKOc  
  void DeleteIcon(); 3C=ON.1eg  
  void AddIcon(); f| P%  
  UINT nCount; |gxT-ZM  
  void SaveBmp(); N|WZk2 "  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ;nW#Dn9  
  // Dialog Data |]kcgLqj  
  //{{AFX_DATA(CCaptureDlg) EZlcpCS  
  enum { IDD = IDD_CAPTURE_DIALOG }; ;'CWAJK  
  CComboBox m_Key; i"V2=jTeBv  
  BOOL m_bControl; $iu{u|VSu  
  BOOL m_bAlt; #+I)<a7\  
  BOOL m_bShift; ~<!b}Hv  
  CString m_Path; J{<,V\t)  
  CString m_Number; )FVW/{NF@q  
  //}}AFX_DATA J\VG/)E  
  // ClassWizard generated virtual function overrides |E/U(VS3l~  
  //{{AFX_VIRTUAL(CCaptureDlg) O{:_-eI&d  
 public: Xk8+  
  virtual BOOL PreTranslateMessage(MSG* pMsg); fbgq+f`\  
 protected: p^S]O\;M7  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Z\Qa6f!  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ZU\TA|  
  //}}AFX_VIRTUAL b~uz\%'3  
  // Implementation }g6:9%ZMu  
 protected: wju2xM  
  HICON m_hIcon; `3GC}u>}  
  // Generated message map functions 'Pyeb`AXE9  
  //{{AFX_MSG(CCaptureDlg) J}a 8N.S  
  virtual BOOL OnInitDialog(); H~y 7o_tg  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); j<[+vrj  
  afx_msg void OnPaint(); ]"?+R+  
  afx_msg HCURSOR OnQueryDragIcon(); OY$P8y3MY  
  virtual void OnCancel(); <7Igd6u  
  afx_msg void OnAbout(); sY,q*}SLD  
  afx_msg void OnBrowse(); T <J%|d .'  
  afx_msg void OnChange(); ,QW>M$g{  
 //}}AFX_MSG U6SgV 8  
 DECLARE_MESSAGE_MAP() lB_&Lq 8G  
}; 9;,_Q q  
#endif Rf7*Ut wVr  
aI @&x  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file cEzWIS?pp\  
#include "stdafx.h" >:7W.QLRU  
#include "Capture.h" s+m,ASj  
#include "CaptureDlg.h" m#y?k1GY  
#include <windowsx.h> } ti+tM*  
#pragma comment(lib,"hook.lib") 5<1,`Bq@  
#ifdef _DEBUG gHCk;dmq81  
#define new DEBUG_NEW D4jf%7X!Lu  
#undef THIS_FILE f{_K%0*  
static char THIS_FILE[] = __FILE__; &Z Ja}5k!r  
#endif Mx& P^#B3  
#define IDM_SHELL WM_USER+1 X2ShxD|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); n- cEa/g  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); sA6Ku(9  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; doJ\7c5uU  
class CAboutDlg : public CDialog jTjGbC]X  
{ WR;"^<i9  
 public: "b6ZAgxv  
  CAboutDlg(); OW$? 6  
  // Dialog Data %DJxUuh  
  //{{AFX_DATA(CAboutDlg) cZn B 2T?  
  enum { IDD = IDD_ABOUTBOX }; tg%U 2+.q  
  //}}AFX_DATA E2f9J{ Ki=  
  // ClassWizard generated virtual function overrides 'k2Z$+  
  //{{AFX_VIRTUAL(CAboutDlg) DFvLCGkDk  
 protected: +/idq  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support pfCNFF*"  
  //}}AFX_VIRTUAL adEcIvN$  
  // Implementation {eR,a-D!7  
 protected:  %trtP  
  //{{AFX_MSG(CAboutDlg) 0>jo+b\D$  
  //}}AFX_MSG G[V?# 7.  
  DECLARE_MESSAGE_MAP() Oh9jr"Gm=  
}; 3e)3t`  
lH_S*FDa  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ti`R  
{ ^%|(dMo4  
 //{{AFX_DATA_INIT(CAboutDlg) ;D5B$ @W>  
 //}}AFX_DATA_INIT LGb.>O^  
} 8e_ITqV%  
#]`ejr:2O  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Q^q G=  
{ GvQ|+vC  
 CDialog::DoDataExchange(pDX); ]# hT!VOd  
 //{{AFX_DATA_MAP(CAboutDlg) w+vYD2 a  
 //}}AFX_DATA_MAP *GsrG*OM*D  
} G6X  
22?9KZ`Z=  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ^0t81,`  
 //{{AFX_MSG_MAP(CAboutDlg) 1a {~B#  
 // No message handlers -CW$p=y}  
 //}}AFX_MSG_MAP #mqz*=L3  
END_MESSAGE_MAP() Q$iGpTL  
}-{l(8-  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) B1@c`BJ;9T  
: CDialog(CCaptureDlg::IDD, pParent) rnxO2   
{ $jb3#Rj4  
 //{{AFX_DATA_INIT(CCaptureDlg) ["N>Po  
  m_bControl = FALSE; ;F@dN,Y  
  m_bAlt = FALSE; :SSlUl4sU$  
  m_bShift = FALSE; :xd&V%u`  
  m_Path = _T("c:\\"); LQYT/  
  m_Number = _T("0 picture captured."); ]3#_BL)M8p  
  nCount=0; uC G^,BQ  
  bRegistered=FALSE; wxPg*R+t  
  bTray=FALSE; 8}p5MG  
 //}}AFX_DATA_INIT hIa@JEIt  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 fw^mjD  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Uc e#v)  
} 'w.:I TJf  
6m21Y8N  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) }/G~"&N[  
{ r2QC$V:0  
 CDialog::DoDataExchange(pDX); 9&}qie,  
 //{{AFX_DATA_MAP(CCaptureDlg) ^sH1YE}0  
  DDX_Control(pDX, IDC_KEY, m_Key); ~I/7{B|yX  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); =_cWCl^5  
  DDX_Check(pDX, IDC_ALT, m_bAlt); J8a4.prqI  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); a(Z" }m  
  DDX_Text(pDX, IDC_PATH, m_Path); 4BuS? #_  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 3uRnbO-  
 //}}AFX_DATA_MAP vzaxi;S<  
} 2!dIW5I  
]8YHA}P  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) /eR@&!D '  
//{{AFX_MSG_MAP(CCaptureDlg) 'ESy>wA{y<  
 ON_WM_SYSCOMMAND() ^f!d8 V  
 ON_WM_PAINT() pM[UC{  
 ON_WM_QUERYDRAGICON() O\OG~`HBN  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) wlKpHd*  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) >~J_9'gX6  
 ON_BN_CLICKED(ID_CHANGE, OnChange) )'%L#  
//}}AFX_MSG_MAP x#dJH9NR[  
END_MESSAGE_MAP() OY~5o&Oa  
7"4|`y^#  
BOOL CCaptureDlg::OnInitDialog() Q*$x!q  
{ biGaP#"0  
 CDialog::OnInitDialog(); 9 J5Z'd_  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); scL7PxJ5  
 ASSERT(IDM_ABOUTBOX < 0xF000); 0; V{yh  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ]RnX'yw^  
 if (pSysMenu != NULL) vR1%&(f{  
 { ,O a)  
  CString strAboutMenu; 7-e)V{A`w  
  strAboutMenu.LoadString(IDS_ABOUTBOX); pS%,wjb&P  
  if (!strAboutMenu.IsEmpty()) r(vk2Qy  
  { >YoK?e6  
   pSysMenu->AppendMenu(MF_SEPARATOR); j- F=5)A  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); $ Qg81mu  
  } +$},Hu69j  
 } z=)5M*h  
 SetIcon(m_hIcon, TRUE); // Set big icon GUat~[lUrj  
 SetIcon(m_hIcon, FALSE); // Set small icon [zf9UUc~  
 m_Key.SetCurSel(0); S2jo@bp!  
 RegisterHotkey(); {!oO>t  
 CMenu* pMenu=GetSystemMenu(FALSE); qLYv=h$,  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); _rjCwo\  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 7Ox vq^[  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); oF ,8j1  
 return TRUE; // return TRUE unless you set the focus to a control VdK-2O(.-  
} r="X\ [on  
)J#@L*  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) $#Ji=JX  
{ vgE5(fJh  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) -JwH^*Ad  
 { m@HU;J\I  
  CAboutDlg dlgAbout; {8I93]  
  dlgAbout.DoModal(); 3wR5:O$H  
 } hr6f}2  
 else 3v0)oK  
 { E?08=$^5%  
  CDialog::OnSysCommand(nID, lParam); 7^Onq0ym T  
 }  KQW  
} u4+VG5.rhT  
`hH1rw@7<  
void CCaptureDlg::OnPaint() 3U:0,-j"  
{ ?'_iqg3  
 if (IsIconic()) Wdy2;a<\{  
 { mbS &>  
  CPaintDC dc(this); // device context for painting M>I}^Zp!  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 89 (k<m  
  // Center icon in client rectangle s_1]&0<  
  int cxIcon = GetSystemMetrics(SM_CXICON); yobi$mnsy!  
  int cyIcon = GetSystemMetrics(SM_CYICON); )UJ]IB-Q|1  
  CRect rect; :EA,0 ,  
  GetClientRect(&rect); qvk?5#B  
  int x = (rect.Width() - cxIcon + 1) / 2; Jge;/f!i  
  int y = (rect.Height() - cyIcon + 1) / 2; @69q// #B  
  // Draw the icon QL\'pW5  
  dc.DrawIcon(x, y, m_hIcon); BwBv 'p+n  
 } lXz<jt@5  
 else ruE.0VI@  
 { n7{c0;)$  
  CDialog::OnPaint(); sHEISNj/^  
 } N$=<6eQm  
} DTr0u}m  
Vx#xq#wK  
HCURSOR CCaptureDlg::OnQueryDragIcon() Pel3e ~?t  
{ 9'4cqR  
 return (HCURSOR) m_hIcon; &'|bZms g  
} Y@.:U*  
OK2wxf  
void CCaptureDlg::OnCancel() .eeM&n;c  
{ :W'1Q2  
 if(bTray) E26ZVFg  
  DeleteIcon(); cxmr|- ^  
  CDialog::OnCancel(); ?^@;8m  
} K, 35*  
!J6k\$r  
void CCaptureDlg::OnAbout() 8"S0E(,mu  
{ p6ZKyi  
 CAboutDlg dlg; r<b g->lX  
 dlg.DoModal(); "dkvk7zCP  
} 8ztY_"]3p  
*J%+zH  
void CCaptureDlg::OnBrowse() Z~P5SEg  
{ 02=eE|Y@  
 CString str; 2 K` hH  
 BROWSEINFO bi; LL:B H,[  
 char name[MAX_PATH]; (F#Qunze  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); < Gu s9^_  
 bi.hwndOwner=GetSafeHwnd(); b2:CFtH5  
 bi.pszDisplayName=name; 7W 4[1  
 bi.lpszTitle="Select folder"; .-<o[(s  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 2P]rJ  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); G2em>W_n  
 if(idl==NULL) i*F^;-q)  
  return; , {]>U'-  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); -o=qYkyLK  
 str.ReleaseBuffer(); q`qbaX\J3  
 m_Path=str; "S6d ^  
 if(str.GetAt(str.GetLength()-1)!='\\') /dtFB5Z"w  
  m_Path+="\\"; <ZCjQkka>r  
 UpdateData(FALSE); EpPKo  
} 7<X_\,I  
(Kx3:gs  
void CCaptureDlg::SaveBmp() .PF~8@1ju  
{ [,l BY-Kz+  
 CDC dc; HhIa=,VY  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); X4 xnr^  
 CBitmap bm; cp]\<p('A  
 int Width=GetSystemMetrics(SM_CXSCREEN); 6R"& !.ZF  
 int Height=GetSystemMetrics(SM_CYSCREEN); Y2Y/laD  
 bm.CreateCompatibleBitmap(&dc,Width,Height); x.}iSE{  
 CDC tdc; ;B!&( 50e  
 tdc.CreateCompatibleDC(&dc); _d,_&7  
 CBitmap*pOld=tdc.SelectObject(&bm); %m{h1UQQ +  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ~|+   
 tdc.SelectObject(pOld); ld}- }W-cq  
 BITMAP btm; ])vM# f  
 bm.GetBitmap(&btm); -R| v&h%T  
 DWORD size=btm.bmWidthBytes*btm.bmHeight;  rf oLg  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); "y#$| TMB  
 BITMAPINFOHEADER bih; !~PV\DQN  
 bih.biBitCount=btm.bmBitsPixel; 4fQ<A <2/  
 bih.biClrImportant=0; Z+FJ cvYx  
 bih.biClrUsed=0; !$Nh:(>:  
 bih.biCompression=0; 8)'OXR0/  
 bih.biHeight=btm.bmHeight; )g+~"&Gcx  
 bih.biPlanes=1;  w8$8P  
 bih.biSize=sizeof(BITMAPINFOHEADER); @ 2Z{en?  
 bih.biSizeImage=size; l g~Gkd6  
 bih.biWidth=btm.bmWidth; S0du, A~  
 bih.biXPelsPerMeter=0; -I '#G D>  
 bih.biYPelsPerMeter=0; =`99ez+y  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); g \&Z_  
 static int filecount=0; 3Vs8"BFjz  
 CString name; 1H{J T op  
 name.Format("pict%04d.bmp",filecount++); t#=W'HyW8  
 name=m_Path+name; yIA- +# r[  
 BITMAPFILEHEADER bfh; 5{L~e>oS9  
 bfh.bfReserved1=bfh.bfReserved2=0; 'de&9\  
 bfh.bfType=((WORD)('M'<< 8)|'B'); PFu{OJg&  
 bfh.bfSize=54+size; cY0NQKUk~  
 bfh.bfOffBits=54;  l|j  
 CFile bf; jH({Qc,97  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ #Ipi3  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); n#|ljC  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); "A6m-xE~  
  bf.WriteHuge(lpData,size); whxTCIV  
  bf.Close(); 2Jo|]>nl}u  
  nCount++; o#fr5>h-w  
 } g]vo."}5E  
 GlobalFreePtr(lpData); u%!/-&?wF  
 if(nCount==1) tp*.'p-SI  
  m_Number.Format("%d picture captured.",nCount); ($'W(DH4  
 else J}BN}|Y@2  
  m_Number.Format("%d pictures captured.",nCount); 9kHVWDf  
  UpdateData(FALSE); >J*x` a3Q  
} r2yJ{j&s  
;x%"o[[>  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 0Un?[O  
{ `i`+yh>pc#  
 if(pMsg -> message == WM_KEYDOWN) hz:h>Hwy  
 { /o OZ>B%1s  
  if(pMsg -> wParam == VK_ESCAPE) 2,aH1Xbex  
   return TRUE; }C4wED.  
  if(pMsg -> wParam == VK_RETURN) R!f<6l8#W  
   return TRUE; ,_iq$I;  
 } ~-R%m  
 return CDialog::PreTranslateMessage(pMsg); jaw&[f 7  
} 3{$vN).  
^G|* =~_  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) <aztbq?  
{ 7UIf   
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ &^2SdF  
  SaveBmp(); "i#aII+T  
  return FALSE; wXjidOd $  
} vj jVZ  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ zD)/QFILy  
 CMenu pop; !iO2yp  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); pHT]2e#  
 CMenu*pMenu=pop.GetSubMenu(0); mG"xo^1_H  
 pMenu->SetDefaultItem(ID_EXITICON); jc!m; U t  
 CPoint pt; <d @9[]  
 GetCursorPos(&pt); 8EI9&L>  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); _%q~K (::  
 if(id==ID_EXITICON) F+"_]  
  DeleteIcon(); 84vd~Cf 9  
 else if(id==ID_EXIT) z/u^  
  OnCancel(); >`r3@|UY  
 return FALSE; P q$0ih  
} ,jOJ\WXP  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); I)tiXcJw  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) <+k"3r{y"  
 AddIcon(); ia7<AwV  
 return res; J$Z=`=] t+  
} H1 I^Vij  
rUpe  ;c  
void CCaptureDlg::AddIcon() fqhL"Ah   
{ W%4=x>J-  
 NOTIFYICONDATA data; [% C,&h5  
 data.cbSize=sizeof(NOTIFYICONDATA); `J1HQ!Z  
 CString tip; GL=}Vu`(*  
 tip.LoadString(IDS_ICONTIP); } vmRm*8z  
 data.hIcon=GetIcon(0); >~SS^I0  
 data.hWnd=GetSafeHwnd(); z@yTkH_  
 strcpy(data.szTip,tip); `PC9t)%.pV  
 data.uCallbackMessage=IDM_SHELL; 0V4B Q:v  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; I|U'@E  
 data.uID=98; _p^ "l2%D/  
 Shell_NotifyIcon(NIM_ADD,&data); 27EK +$  
 ShowWindow(SW_HIDE); |M7cB$y  
 bTray=TRUE; H5T_i$W  
} Y3Fj3NwS  
O\6U2b~  
void CCaptureDlg::DeleteIcon() {%f{U"m  
{ 6RnzT d  
 NOTIFYICONDATA data; unLhI0XW  
 data.cbSize=sizeof(NOTIFYICONDATA); pFvu,Q"  
 data.hWnd=GetSafeHwnd(); _!nsEG VV  
 data.uID=98; D5TDg\E  
 Shell_NotifyIcon(NIM_DELETE,&data); 3 r&  
 ShowWindow(SW_SHOW); +n)n6} S  
 SetForegroundWindow(); !cwZ*eM  
 ShowWindow(SW_SHOWNORMAL); O`B,mgT(  
 bTray=FALSE; uh )S;3|  
} Nc;O)K!FH  
fSkDD>&  
void CCaptureDlg::OnChange() =V[uXm  
{ [={mCGU  
 RegisterHotkey(); U ? +_\  
} ''y.4dvX  
|A%9c.DG.  
BOOL CCaptureDlg::RegisterHotkey() Ao\xse{E  
{ BAf$ty h  
 UpdateData(); D|N4X`T`  
 UCHAR mask=0; ^7-zwl(>?N  
 UCHAR key=0; Oynb "T&8  
 if(m_bControl) ,o& C"sb  
  mask|=4; [_,as  
 if(m_bAlt) \$ytmtf5  
  mask|=2; Smr{+m a  
 if(m_bShift) fpD$%.y'J  
  mask|=1; rtV`Q[E  
  key=Key_Table[m_Key.GetCurSel()]; 7>FXsUt_  
 if(bRegistered){ m`/Nl<  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ZK5nN9`  
  bRegistered=FALSE; 0l!#u`cCI  
 } F (*B1J2_g  
 cMask=mask; t|aV:x  
 cKey=key; g7\ =  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); CXa[%{[n  
 return bRegistered; Dac)`/  
} (_T{Z>C/J  
>STtX6h  
  四、小结 ;<[X\;|'  
(l{vlFWd  
  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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