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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: {e|[%reSkg  
  +\v?d&.f0  
  一、实现方法 ,}K<*t[I  
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  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: bV,}Pp+/"!  
V+O"j^Z_J  
#pragma data_seg("shareddata") 9K1oZ?)_z  
HHOOK hHook =NULL; //钩子句柄 %2v4<icvq  
UINT nHookCount =0; //挂接的程序数目 ,\NFt`]j  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 y*X_T,K 8  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 VkZ7#  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey nqLA}u4IM  
static int KeyCount =0; }iuWAFZbGS  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 j_Yp>=+[  
#pragma data_seg() I_RsYw  
qgfi\/$6  
  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"*AtGR+"  
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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: t.;LnrY  
~?(N  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR rS;Dmm  
cKey,UCHAR cMask) Fi0GknQ+  
{ EAM5{Nc  
 BOOL bAdded=FALSE; I'LnI*  
 for(int index=0;index<MAX_KEY;index++){ 1')%`~  
  if(hCallWnd[index]==0){ '3g[]M@M  
   hCallWnd[index]=hWnd; "s{5O>  
   HotKey[index]=cKey; <u2}i<#  
   HotKeyMask[index]=cMask; NU0g07"  
   bAdded=TRUE; F]<Xv"  
   KeyCount++; o_~eg8  
   break; ?nL.w  
  } d@qsdYu-*  
 } *6VF $/rP  
 return bAdded; fZoHf\B]{  
} jbAx;Xt'=M  
//删除热键 OynXkH]0T+  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) <[-nF"Q  
{ pS:4CNI{  
 BOOL bRemoved=FALSE; o,)?!{k}  
 for(int index=0;index<MAX_KEY;index++){ #?S^kM-0  
  if(hCallWnd[index]==hWnd){ }9FSO9*&}  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ @<elq'2  
    hCallWnd[index]=NULL; `7r@a  
    HotKey[index]=0; yPal<c  
    HotKeyMask[index]=0; 3eF -8Z(f  
    bRemoved=TRUE; sc}~8T  
    KeyCount--; Sn|BlXrey  
    break; X<I+&Zi  
   } /#)/;  
  } xsD($_  
 } Ck) * &  
 return bRemoved; s6@DGSJ  
} ATK_DE Au  
6}FP  
Jt}Bpg!J  
  DLL中的钩子函数如下: 32`{7a3!=  
 z62;cv  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) j3{D^|0bP  
{ yjF1}SQ  
 BOOL bProcessed=FALSE; 7Mg=b%IYs  
 if(HC_ACTION==nCode) ci?qT,&  
 { 0|{u{w@!`  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 : qd`zG3  
   switch(wParam) JPoN&BTCj  
   {  ~=uWD&5B4  
    case VK_MENU: ,Vt/(x-  
     MaskBits&=~ALTBIT; 1ng!G 7g  
     break; ?j"KV_  
    case VK_CONTROL: ?B2] -+Y  
     MaskBits&=~CTRLBIT; Gz,i~XX  
     break; {?:X8&Sf  
    case VK_SHIFT: Hl{S]]z  
     MaskBits&=~SHIFTBIT; iT2B'QI=<  
     break;  J4f i'  
    default: //judge the key and send message ,[P{HrHx  
     break; hpO`]  
   } [PNT\ElT  
   for(int index=0;index<MAX_KEY;index++){ ?#}N1k\S  
    if(hCallWnd[index]==NULL) =A83W/4  
     continue; pHLB= r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) hEKf6#  
    { Z{]0jhUyNh  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 7$CBx/X50)  
     bProcessed=TRUE; HTX?,C_  
    } Brf5dT49  
   } PoG-Rqe  
  } XAF+0 x!  
  else if((lParam&0xc000ffff)==1){ //有键按下 CxwoBuG=?  
   switch(wParam) < t,zaIi  
   { leTf&W  
    case VK_MENU:  W\d{a(*  
     MaskBits|=ALTBIT; =T HpdtL  
     break; fSK]|"c  
    case VK_CONTROL: JB<Sl4  
     MaskBits|=CTRLBIT; um!J]N^  
     break; Rh_np  
    case VK_SHIFT: O$_)G\\\m  
     MaskBits|=SHIFTBIT; ]>=}*=  
     break; /|C*  
    default: //judge the key and send message -zOdU}91Ao  
     break; bk;?9%TW  
   } H[,i{dD  
   for(int index=0;index<MAX_KEY;index++){ f4 P8Oz  
    if(hCallWnd[index]==NULL) I|gB@|_~  
     continue; &$`P,i 1)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) F\KjEl0  
    { bDL,S?@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); |H;F7Y_  
     bProcessed=TRUE; Qz5sxi  
    } ZX9TYN  
   } J;.wXS_U8  
  } 4|riKo)  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 E8$20Ue  
   for(int index=0;index<MAX_KEY;index++){ /Z'L^ L%R  
    if(hCallWnd[index]==NULL) K|zZS%?$  
     continue; 6jE |  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) &Sw%<N*r  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); u0|8Tgf  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 }B\a<0L/  
   } X' H[7 ^W  
  } RJ  8+h  
 } dCi?SIN  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); $'BSH4~|.  
} I*{4rDt  
+ jc!5i .  
  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=;U@k@>  
&"f";  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); n}F&1Z  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 3!XjtVhK?I  
$q6BP'7  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 7K,-01-:  
_x%7@ .TB  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) y{ibO}s  
{ ^1iSn)&  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) JEXy%hl  
 { l=S35og  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 e6@=wnoX u  
  SaveBmp(); r e/@D@%  
  return FALSE; O#:$^#j&  
 } \F1_lq;K  
 …… //其它处理及默认处理 WIC/AL'  
} 0^I|u t4  
C7lH]`W|/  
'\Giv!>  
  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。 {> eXR?s/  
mn, =i  
  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。 }zkHJxZgE  
_<k\FU r  
  二、编程步骤 dgR g>)V  
{MtpkUN  
  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"; 1C}NQ!.  
.k,1f*%  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; `Nz/O h7  
&]"  
  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; ")O%86_Q:  
[Y|8\Ph`&  
  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; ~ELNyI11  
2`7==?  
  5、 添加代码,编译运行程序。 GPkmf%FJ  
2D75:@JL}|  
三、程序代码 xHL( !P F  
d"}k! 0m  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL -G}[AkmS  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) e@Fo^#ImDx  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ lD)%s!  
#if _MSC_VER > 1000 #p P[xE"Y  
#pragma once R)_%i<nq\  
#endif // _MSC_VER > 1000 fol,xMc&  
#ifndef __AFXWIN_H__ tNO-e|~'  
#error include 'stdafx.h' before including this file for PCH HJLu'KY }  
#endif M2PAy! J  
#include "resource.h" // main symbols `NCwK6/i  
class CHookApp : public CWinApp od IV:(  
{ d/PiiiFf,  
 public: x'+T/zw  
  CHookApp(); |jI#"LbF  
  // Overrides 3LAIl913  
  // ClassWizard generated virtual function overrides o< |cA5f\  
  //{{AFX_VIRTUAL(CHookApp) I8wXuIN_  
 public: {@eJtF+2  
  virtual BOOL InitInstance(); 1C< uz29  
  virtual int ExitInstance(); rSZd!OQ  
  //}}AFX_VIRTUAL 'FqQzx"r  
  //{{AFX_MSG(CHookApp) Huy5-[)15  
  // NOTE - the ClassWizard will add and remove member functions here. k.5u  
  // DO NOT EDIT what you see in these blocks of generated code ! xQ}pu2@d  
  //}}AFX_MSG `z{%(_+[  
  DECLARE_MESSAGE_MAP() )U~=Pf"  
}; pf1BN@ t  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); U &C!}  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); VPO N-{=`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); C"6?bg5N  
BOOL InitHotkey(); zz+$=(T:M  
BOOL UnInit(); -m)X]]~C  
#endif {_7 i8c<s=  
&ib5* 4!  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. fKeT,U`W  
#include "stdafx.h" 9{RB{<Se!  
#include "hook.h" ;T"zV{;7BR  
#include <windowsx.h> &+cEV6vb+  
#ifdef _DEBUG ^Y=\#-Dd  
#define new DEBUG_NEW p2ogn}`  
#undef THIS_FILE GC>e26\:  
static char THIS_FILE[] = __FILE__; e5*ni/P  
#endif cv?06x{  
#define MAX_KEY 100 *AG#316  
#define CTRLBIT 0x04 D ~stM  
#define ALTBIT 0x02 0rOfrTNOz%  
#define SHIFTBIT 0x01 p~SClaR3H  
#pragma data_seg("shareddata")  8cU}I4|  
HHOOK hHook =NULL; 4A8;tU$&  
UINT nHookCount =0; % 5m/  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey \SN&G `o<  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Xnz3p"  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey w\(.3W7  
static int KeyCount =0; [h^2Y&Au5  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift I/a/)No  
#pragma data_seg() nH`Q#ZFz]?  
HINSTANCE hins; T V<'8 L  
void VerifyWindow(); R%{ a1r>9h  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Rtb7|  
//{{AFX_MSG_MAP(CHookApp) K@sV\"U(*E  
// NOTE - the ClassWizard will add and remove mapping macros here. ,24p%KJ*X  
// DO NOT EDIT what you see in these blocks of generated code! }@;ep&b*  
//}}AFX_MSG_MAP q#T/  
END_MESSAGE_MAP() >64P6P;S  
uEktQ_u[  
CHookApp::CHookApp() +@94;me  
{ 8"U. Hnu  
 // TODO: add construction code here, Fgp]l2*  
 // Place all significant initialization in InitInstance mp=z  
} !D@ZYK;  
i&5XF  
CHookApp theApp; H=g`hF]`  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) G+%zn|  
{ qT%FmX  
 BOOL bProcessed=FALSE; I$<<(VWH  
 if(HC_ACTION==nCode) CS@FYO  
 { T?x[C4wf+  
  if((lParam&0xc0000000)==0xc0000000){// Key up 8dO!  
   switch(wParam) =-8bsV/l  
   { ;LG#.~f  
    case VK_MENU: *QwY]j%^  
     MaskBits&=~ALTBIT; uW30ep'  
     break; .$qnZWcgG  
    case VK_CONTROL: <R''oEf9  
     MaskBits&=~CTRLBIT; F$ #U5}Q  
     break; 1`(tf6op  
    case VK_SHIFT: vd [}Gd  
     MaskBits&=~SHIFTBIT; jFASX2.p  
     break; S<VSn}vn  
    default: //judge the key and send message <J`0mVOX  
     break; g'H$R~ag  
   } G_0( |%  
   for(int index=0;index<MAX_KEY;index++){ n;@bLJ$W  
    if(hCallWnd[index]==NULL) fDT%!  
     continue; W8ouO+wK  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `-(|>5wWS  
    { =T(6#"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); N>XS=2tzN  
     bProcessed=TRUE; $}) g?Q  
    } r[BVvX/,F  
   } *1v[kWa?  
  } q=%RDG+  
  else if((lParam&0xc000ffff)==1){ //Key down 9;r)#3Q[^  
   switch(wParam) hEBY8=gK  
   { ]^lw*724'>  
    case VK_MENU: }% `.h"  
     MaskBits|=ALTBIT; A/u)# ^\  
     break; zG ^$"f2  
    case VK_CONTROL: P(H8[,  
     MaskBits|=CTRLBIT; PcA2/!a  
     break; )TVFtI=,NN  
    case VK_SHIFT: mS~o?q-n  
     MaskBits|=SHIFTBIT; *v9 2  
     break; d/BM&r  
    default: //judge the key and send message K POa|$  
     break; yf[~Yl>Ogw  
   } -=~| ."O  
   for(int index=0;index<MAX_KEY;index++) ~$)2s7 O  
   { Pb1*\+  
    if(hCallWnd[index]==NULL) VFRi1\G  
     continue; "JlpU-8[0@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) sE:M@`2L  
    { `%+Wz0(K  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); g/P+ZXJ  
     bProcessed=TRUE; -(  
    } bYEy<7)x  
   } iV&6nh(  
  } '}fzX2Q#  
  if(!bProcessed){ )n2 re?S  
   for(int index=0;index<MAX_KEY;index++){ %Z):>'  
    if(hCallWnd[index]==NULL) *=(lyx_O  
     continue; gDQ1?N'8{t  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 9y<*8bI   
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 9~p[  
   } c(!6^qk]!`  
  } ]ooIr Y8  
 } )}"wesNo".  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); nQ5n-A&["  
} A-ZN F4  
7UdM  
BOOL InitHotkey() n/+.s(7c  
{ mj9 <%P  
 if(hHook!=NULL){ +VO-oFE|  
  nHookCount++; L&u$t}~)  
  return TRUE; :I+Gu*0WD  
 } )N7Y^CN~  
 else  %-c*C$  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); hw= Ft4L  
  if(hHook!=NULL) 3HcQ(+Z  
   nHookCount++; nlW +.a[  
  return (hHook!=NULL); 7ccO93Mz  
} KX'{[7}m'  
BOOL UnInit() FB{KH .  
{ -OapVac  
 if(nHookCount>1){ ;#vKi0V7  
  nHookCount--; whi`Z:~  
  return TRUE; 23Nw!6S  
 } \$*7 >`k  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ]x(e&fyHB  
 if(unhooked==TRUE){  |8My42yf  
  nHookCount=0; u~WVGjoQ  
  hHook=NULL; EfCx`3~EX  
 } Hn5|B 3vN  
 return unhooked; @d mV  
} Exc9` 7%.  
va}Pj#=  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) r76J N  
{ @ycDCB(D}  
 BOOL bAdded=FALSE; ??M"6k  
 for(int index=0;index<MAX_KEY;index++){ j4|N- :  
  if(hCallWnd[index]==0){ Kx;eaz:gx  
   hCallWnd[index]=hWnd; )qo {c1X  
   HotKey[index]=cKey; d@XV:ae  
   HotKeyMask[index]=cMask; +trC,D  
   bAdded=TRUE; + HK8jCa  
   KeyCount++; i3 6eBjT  
   break;  SL#0kc0x  
  } hc>HQrd  
 } &jslyQ#  
 return bAdded; mID"^NOi#  
} 3?V_BUoON  
c'%-jG)\  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) SYCEQ5 -  
{ _B/ dWA,P  
 BOOL bRemoved=FALSE; >z%&xgOa  
 for(int index=0;index<MAX_KEY;index++){ f !I[>&n  
  if(hCallWnd[index]==hWnd){ psg)*'r  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ >8WP0 Qx/  
    hCallWnd[index]=NULL; ]:4*L  
    HotKey[index]=0; g# Sl %Y  
    HotKeyMask[index]=0; 8FKXSqhVM  
    bRemoved=TRUE; zgNc4B  
    KeyCount--; zNxW'?0Z?  
    break; c:<005\Bg  
   } ;<Ar=?  
  } 9x>d[-#y:J  
 } -likj# Z  
 return bRemoved; y\Ic@-aWI  
} m[~V/N3  
Xejo_SV&?  
void VerifyWindow()  >qS9PX  
{ 5-aj 2>=7  
 for(int i=0;i<MAX_KEY;i++){ x[h^[oF0  
  if(hCallWnd!=NULL){ ts\5uiB<%  
   if(!IsWindow(hCallWnd)){ MZSy6v  
    hCallWnd=NULL; \;qW 3~  
    HotKey=0; i;/5Y'KZ  
    HotKeyMask=0; 3RYpJAH  
    KeyCount--; u%}nw :>  
   } e1%/26\  
  } 5*lT.  
 } [N7{WSZ&  
} )Im#dVQs=  
bM{s T"  
BOOL CHookApp::InitInstance() 6-z%633DL  
{ xTj|dza  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); =e9>FWf>  
 hins=AfxGetInstanceHandle(); v!<gY m&  
 InitHotkey(); ]s'Q_wh_-v  
 return CWinApp::InitInstance(); yeXx',]a  
} A mNW0.}  
#gRM i)(F  
int CHookApp::ExitInstance() l_o@miG/  
{ *5%d XixN  
 VerifyWindow(); =Je[c,&j$?  
 UnInit(); tnH2sHby  
 return CWinApp::ExitInstance(); $*e2YQdLo  
} B* ?]H*K  
fI&t]   
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file U>]$a71  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) _I@9HC 4  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 9^oKtkoDZ  
#if _MSC_VER > 1000 yXSFjcoB  
#pragma once =/s>Q l  
#endif // _MSC_VER > 1000 s/$?^qtyC  
qh9Z50E9  
class CCaptureDlg : public CDialog WI-&x '  
{ % tS,}ze  
 // Construction j[`j9mM8  
 public: w>pq+og&  
  BOOL bTray; \-h%O jf4  
  BOOL bRegistered; `uOT+B%R  
  BOOL RegisterHotkey(); F*IzQ(#HW  
  UCHAR cKey; >AVVEv18  
  UCHAR cMask; t;W0"ci9  
  void DeleteIcon(); \.MR""@y`{  
  void AddIcon(); yv t.  
  UINT nCount; ]A~WIF  
  void SaveBmp(); [<n2Uz7MP  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor (}Z@R#njH  
  // Dialog Data /rWd=~[MO  
  //{{AFX_DATA(CCaptureDlg) 3{'Ne}5%I  
  enum { IDD = IDD_CAPTURE_DIALOG }; 5rw 7;'  
  CComboBox m_Key; A)bWcB}U  
  BOOL m_bControl; Y<N5# );f  
  BOOL m_bAlt; 01wX`"I  
  BOOL m_bShift; mk.9OhYY  
  CString m_Path; uatm/o^~,  
  CString m_Number; l4F%VR4KT  
  //}}AFX_DATA 2BQ j  
  // ClassWizard generated virtual function overrides !%CWZZ 6u  
  //{{AFX_VIRTUAL(CCaptureDlg) e7 ^mmm  
 public: ~xkeuU  
  virtual BOOL PreTranslateMessage(MSG* pMsg); )eUh=eW  
 protected: &XIt5<$~R  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support E{XH?_xo  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); kZR8a(4D  
  //}}AFX_VIRTUAL HVi'eNgo  
  // Implementation pmuvg6@h  
 protected: ~ksi</s  
  HICON m_hIcon; KaPAa:Q  
  // Generated message map functions :flx6,7D  
  //{{AFX_MSG(CCaptureDlg) @i 2E\}  
  virtual BOOL OnInitDialog(); CDsSrKhx  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); )(bW#-  
  afx_msg void OnPaint(); <c2E'U)X  
  afx_msg HCURSOR OnQueryDragIcon(); j'Gt&\4  
  virtual void OnCancel(); PQy4{0 _  
  afx_msg void OnAbout(); -.1y(k^4E  
  afx_msg void OnBrowse(); '*K:  lx  
  afx_msg void OnChange(); 3eb%OEMYk  
 //}}AFX_MSG Si_ _8D  
 DECLARE_MESSAGE_MAP() Z"/p,A9W9|  
}; uZNTHD  
#endif `g(Y*uCp  
U;YC}r  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file [$mHv,~  
#include "stdafx.h" /KFfU1  
#include "Capture.h" <CS(c|7  
#include "CaptureDlg.h" l{5IUuUi  
#include <windowsx.h> "sS}N%!  
#pragma comment(lib,"hook.lib") 1Ir21un  
#ifdef _DEBUG k Z?=AXu  
#define new DEBUG_NEW F^WP<0C  
#undef THIS_FILE abuh`H#  
static char THIS_FILE[] = __FILE__; fY{1F   
#endif 9Vg?{v!yn  
#define IDM_SHELL WM_USER+1 ;y,5k?  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); K*%9)hq  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); PY{ G [  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; WA5&# kg\  
class CAboutDlg : public CDialog /NLui@|R  
{ h{CL{>d  
 public: +[M6X} TQ  
  CAboutDlg(); 52%2R]G!  
  // Dialog Data vmU@^2JSJ  
  //{{AFX_DATA(CAboutDlg) Z?6%;n^ 54  
  enum { IDD = IDD_ABOUTBOX }; @3) (BpFe  
  //}}AFX_DATA qyZ" %Kz  
  // ClassWizard generated virtual function overrides |t^E~HLm,  
  //{{AFX_VIRTUAL(CAboutDlg) . k#U]M  
 protected: >=qf/K +#  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support @Pm>sY}d<I  
  //}}AFX_VIRTUAL xe]y]  
  // Implementation ap.K=-H  
 protected: bLB:MW\%  
  //{{AFX_MSG(CAboutDlg) vUN22;Z\  
  //}}AFX_MSG bfFeBBi  
  DECLARE_MESSAGE_MAP() zZ7;jyD  
}; b+%f+zz*h  
3_ r*y9l  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) J*r*X.  
{ -f3p U:G8  
 //{{AFX_DATA_INIT(CAboutDlg) w{I vmdto  
 //}}AFX_DATA_INIT *T- <|zQ  
} VQ(jpns5  
C;;Sih5  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) c?tBi9'Y]  
{ VyXKZ%\dQ/  
 CDialog::DoDataExchange(pDX); _G[g;$ <  
 //{{AFX_DATA_MAP(CAboutDlg) /sUYU (3  
 //}}AFX_DATA_MAP AS!?q  
} >W%EmnLK  
{ME2ImD  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) rxe >}ZO  
 //{{AFX_MSG_MAP(CAboutDlg) zkt+7,vI  
 // No message handlers zvvhFN2s  
 //}}AFX_MSG_MAP $ZUdT  
END_MESSAGE_MAP() 1 8|m)(W  
 '<jyw   
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) u#Pa7_zBj]  
: CDialog(CCaptureDlg::IDD, pParent) sr r :!5  
{ |v`AA?@{8  
 //{{AFX_DATA_INIT(CCaptureDlg) \MsTB|Z  
  m_bControl = FALSE; Umz KY  
  m_bAlt = FALSE; <5-[{Q/2z  
  m_bShift = FALSE; %<)2/|lCd  
  m_Path = _T("c:\\"); -Y1e8H ='  
  m_Number = _T("0 picture captured."); Z)e/ !~""]  
  nCount=0; i/65v  
  bRegistered=FALSE; A^nvp!_  
  bTray=FALSE; t=(!\:[D  
 //}}AFX_DATA_INIT c-x,fS"&W  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 61,;Uc\T  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ?274uAO'  
} ]jtK I4  
J}*,HT*  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) qaqBOHI6G  
{ &x=.$76  
 CDialog::DoDataExchange(pDX); F<ZYh  
 //{{AFX_DATA_MAP(CCaptureDlg) =qoWCmg"&  
  DDX_Control(pDX, IDC_KEY, m_Key); ls?~+\Jb  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 3oBtP<yG.  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 0QB iC]9  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 6|K5!2  
  DDX_Text(pDX, IDC_PATH, m_Path); d:_t-ZZo  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 3YeG$^y"  
 //}}AFX_DATA_MAP P!$Zx)T  
}  H_B4  
qPWP&k  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) P#E&|n7DT  
//{{AFX_MSG_MAP(CCaptureDlg) Yab%/z2:  
 ON_WM_SYSCOMMAND() _A M*@|p,  
 ON_WM_PAINT() l3KVW5-!gS  
 ON_WM_QUERYDRAGICON() xVf| G_5$  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 6 +Sxr  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) z F_M*8=  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Kc!} `Pm  
//}}AFX_MSG_MAP }wWKFX  
END_MESSAGE_MAP() QgrpBG  
\n"{qfn`r  
BOOL CCaptureDlg::OnInitDialog() j>*S5y.{  
{ b}OY4~ Y4  
 CDialog::OnInitDialog(); ~9?cn  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Av @b!iw+  
 ASSERT(IDM_ABOUTBOX < 0xF000); Y_Eb'*PY  
 CMenu* pSysMenu = GetSystemMenu(FALSE); d4m=0G`  
 if (pSysMenu != NULL) .0p0_f=  
 { ZWii)0'PV  
  CString strAboutMenu; *w$W2I>b7  
  strAboutMenu.LoadString(IDS_ABOUTBOX); w:??h4lt  
  if (!strAboutMenu.IsEmpty()) IW)()*8;/  
  { ~ {?_p@&n  
   pSysMenu->AppendMenu(MF_SEPARATOR); /Y*WBTV'  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 7@#>b E6  
  } S_iMVHe  
 } )r';lGh2#  
 SetIcon(m_hIcon, TRUE); // Set big icon "C?#SO B  
 SetIcon(m_hIcon, FALSE); // Set small icon A]y`7jJ  
 m_Key.SetCurSel(0); T\:4qETQF]  
 RegisterHotkey(); 7@C<oy_bb  
 CMenu* pMenu=GetSystemMenu(FALSE); x9NEFtqjm  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ".f ;+wH  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); xpNH?#&  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); G=)i{oC  
 return TRUE; // return TRUE unless you set the focus to a control +QB"8-  
} IWBX'|}K  
> pgX^  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 9 ^o-EC!_  
{ ;1#H62Z*  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 6~OoFm5  
 { bf0+DvIB  
  CAboutDlg dlgAbout; )Z[ft  
  dlgAbout.DoModal(); ~Xr=4V:a+  
 } W"724fwu&  
 else 5&xB6|k  
 { =6xrfDbN8  
  CDialog::OnSysCommand(nID, lParam); &vHoRY  
 } w|3z;-#Q;  
} L%">iQOG#  
Ytgcs( /$  
void CCaptureDlg::OnPaint() $r@ =*(  
{ R[Ll59-  
 if (IsIconic()) :#2Bw]z&z  
 { eeIhed9  
  CPaintDC dc(this); // device context for painting [vge56h  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); U -Y03  
  // Center icon in client rectangle AUeu1(  
  int cxIcon = GetSystemMetrics(SM_CXICON); ;V@WtZv  
  int cyIcon = GetSystemMetrics(SM_CYICON); %lL.[8r|  
  CRect rect; ]d55m/(   
  GetClientRect(&rect); !P ~_Dl2d  
  int x = (rect.Width() - cxIcon + 1) / 2; EQ2#/>  
  int y = (rect.Height() - cyIcon + 1) / 2; PiYY6i0  
  // Draw the icon 6\L0mcXR!  
  dc.DrawIcon(x, y, m_hIcon); z25lZI" X`  
 } %?LOs H   
 else aGK?x1_  
 { @*>@AFnf\Z  
  CDialog::OnPaint(); #btLa\HJ  
 } 0fc/wfv <  
} 0?sRDYaX;c  
aHlcfh9|  
HCURSOR CCaptureDlg::OnQueryDragIcon()  rL/H2[d  
{ |]QqXE-7  
 return (HCURSOR) m_hIcon; Mc#*wEo)8  
} _,q)hOI  
)i q-yjO6  
void CCaptureDlg::OnCancel() j0Bu-sO$w  
{ W8Q|$ZJ88F  
 if(bTray) iM2W]  
  DeleteIcon(); wNq;;AJ$  
  CDialog::OnCancel(); &lR 6sb\  
} L}GC<D:  
XXbqQhf  
void CCaptureDlg::OnAbout() ag$Vgl  
{ .b\$MZ"(  
 CAboutDlg dlg; 8iW;y2qF  
 dlg.DoModal(); nYWvTvZ  
} Z -,J)gW  
0- ><q  
void CCaptureDlg::OnBrowse() pkP?i5 ,  
{ e'~Zo9`r6  
 CString str; 5'0xz.)!  
 BROWSEINFO bi; X_qf"|i  
 char name[MAX_PATH]; g wz7krUTe  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); [qdRUV'  
 bi.hwndOwner=GetSafeHwnd(); ~jK{ ,$:=  
 bi.pszDisplayName=name; t(GR)&>.2  
 bi.lpszTitle="Select folder"; pp.6Ex (R  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 6)z?f4,  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); GGe,fb<k  
 if(idl==NULL) ;?W|#*=R  
  return; H1I{/g  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); (&&4J{`W9  
 str.ReleaseBuffer(); J%V-Q>L  
 m_Path=str;  XEC(P  
 if(str.GetAt(str.GetLength()-1)!='\\') Av?2<  
  m_Path+="\\"; yvgrIdEP  
 UpdateData(FALSE); )Y]{HQd  
} !(q sD+  
t^`O{m<  
void CCaptureDlg::SaveBmp() 6``'%S'#  
{ z?>D_NLX6  
 CDC dc; :1 (p.q=  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); $|]" W=h  
 CBitmap bm;  e`d%-9  
 int Width=GetSystemMetrics(SM_CXSCREEN); D6CS8 ~"  
 int Height=GetSystemMetrics(SM_CYSCREEN); cHcmgW\4  
 bm.CreateCompatibleBitmap(&dc,Width,Height); T_X6Ulp  
 CDC tdc; mK[)mC _8  
 tdc.CreateCompatibleDC(&dc); Qhs/E`k4  
 CBitmap*pOld=tdc.SelectObject(&bm); I6j$X6u  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ,QC{3i~  
 tdc.SelectObject(pOld); XGJj3-eW {  
 BITMAP btm; 76wc,+  
 bm.GetBitmap(&btm); Vm5c+;  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; m~@;~7Ix  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ( xXGSx  
 BITMAPINFOHEADER bih; [~kdPk  
 bih.biBitCount=btm.bmBitsPixel; ZeUvyIG  
 bih.biClrImportant=0; Au{<hQ =  
 bih.biClrUsed=0; 3 N7[.I>A  
 bih.biCompression=0; I/M_p^  
 bih.biHeight=btm.bmHeight; 9Q(+ZG=JkV  
 bih.biPlanes=1; WX}xmtLs  
 bih.biSize=sizeof(BITMAPINFOHEADER); 90|7ArM_[  
 bih.biSizeImage=size; g8Q5m=O*  
 bih.biWidth=btm.bmWidth; 5nTY ?<x`k  
 bih.biXPelsPerMeter=0; ?6L&WB  
 bih.biYPelsPerMeter=0; ^zEwA  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 0VckocF  
 static int filecount=0; *.~6S3}  
 CString name; W?0 lV5/  
 name.Format("pict%04d.bmp",filecount++); "Vw m  
 name=m_Path+name; +E1I");  
 BITMAPFILEHEADER bfh; 4J;-Dq  
 bfh.bfReserved1=bfh.bfReserved2=0; "jTKSgv+q5  
 bfh.bfType=((WORD)('M'<< 8)|'B'); N2oRJ,:B  
 bfh.bfSize=54+size; u5 {JQO  
 bfh.bfOffBits=54; $U$V?x uE  
 CFile bf; Q:|l`*.R  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ %FS$zOsgGK  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Eo\UAc  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); !(n4|Wd  
  bf.WriteHuge(lpData,size); Mva3+T  
  bf.Close(); #6AFdNy  
  nCount++; txZ?=8j_Y  
 } hq:&wN 7Q  
 GlobalFreePtr(lpData); )I^2k4Cg"  
 if(nCount==1) t~E<j+<2B  
  m_Number.Format("%d picture captured.",nCount); s[K^9wz  
 else 4Ue_Y 'LmM  
  m_Number.Format("%d pictures captured.",nCount); q}/WQ]p} <  
  UpdateData(FALSE); j4>a(  
} s:2|c]wQ#R  
#'-Sh7ycW  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) !@x+q)2  
{ yfj K2  
 if(pMsg -> message == WM_KEYDOWN) kloR#?8A  
 { :Gu+m  
  if(pMsg -> wParam == VK_ESCAPE)  QV h4  
   return TRUE; KjFK/Og.  
  if(pMsg -> wParam == VK_RETURN) bn(`O1r[(  
   return TRUE; DNR~_3Aq  
 } ZT[3aXS  
 return CDialog::PreTranslateMessage(pMsg); 3#vinz  
} >6~k9>nDb<  
?9HhG?_x  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) J0 k  
{ zVi15P$  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ KJ?y@Q  
  SaveBmp(); Fhv2V,nZ<  
  return FALSE; 7_wJpTz  
} u>Rb ?`  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ v}sY|p"  
 CMenu pop; iJv48#'ii  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); '`|A I:L  
 CMenu*pMenu=pop.GetSubMenu(0); F,GN[f-  
 pMenu->SetDefaultItem(ID_EXITICON); =(EI~N  
 CPoint pt; X53mzs  
 GetCursorPos(&pt); x$wd O  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); b$Hz3T J(  
 if(id==ID_EXITICON) ?sBh=Ds  
  DeleteIcon(); .}k(L4T|=  
 else if(id==ID_EXIT) Um)>2|rp}  
  OnCancel(); 6CC&Z>  
 return FALSE; X 6 lH|R  
} T *I?9d{k  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 1`LXz3uBe  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) "o&HE@t  
 AddIcon(); ?\/qeGW6G  
 return res; b?Pj< tA  
} kvGCbRC  
h{}mBQl  
void CCaptureDlg::AddIcon() 1/ZR*f a  
{ Sd))vS^g  
 NOTIFYICONDATA data; T#!lPH :&h  
 data.cbSize=sizeof(NOTIFYICONDATA); (X+s-4%  
 CString tip; V8-h%|$p3W  
 tip.LoadString(IDS_ICONTIP); >p])it[q&$  
 data.hIcon=GetIcon(0); mxFn7.|r~  
 data.hWnd=GetSafeHwnd(); w %c  
 strcpy(data.szTip,tip); -6=<#9R  
 data.uCallbackMessage=IDM_SHELL; 8BXqZVm.  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; I,ci >/+b  
 data.uID=98; ~%#mK:+  
 Shell_NotifyIcon(NIM_ADD,&data); wU`!B<,j  
 ShowWindow(SW_HIDE); 7S$&S;  
 bTray=TRUE; *zVvQ=  
} 8[bkHfI  
*Q}[ ]g  
void CCaptureDlg::DeleteIcon() K(T\9J.  
{ E1Q0k5@  
 NOTIFYICONDATA data; ~2uh'e3  
 data.cbSize=sizeof(NOTIFYICONDATA); gJ3c;  
 data.hWnd=GetSafeHwnd(); Di Or{)a  
 data.uID=98; XTqm]  
 Shell_NotifyIcon(NIM_DELETE,&data); F6S~$<  
 ShowWindow(SW_SHOW); !:fv>FEI9  
 SetForegroundWindow(); $v} <'  
 ShowWindow(SW_SHOWNORMAL); ?M6ag_h3  
 bTray=FALSE; _qWC4NMF(  
} {<w +3Va  
q]<xMg#nu  
void CCaptureDlg::OnChange() , fb( WY  
{ N dR ]  
 RegisterHotkey(); r$nkU4N'  
} dEp/dd~(&  
TYjA:d9YH  
BOOL CCaptureDlg::RegisterHotkey() kJ=L2g>W<.  
{ 3gfimD$_E  
 UpdateData(); X)uDSI~  
 UCHAR mask=0; q42FP q  
 UCHAR key=0; ua 8m;>R  
 if(m_bControl) FUeq \Wuo  
  mask|=4; *+lsZ8'^C  
 if(m_bAlt) gs`^~iD]m  
  mask|=2; ~%y\@x7I  
 if(m_bShift) Pg^h,2h  
  mask|=1; }X$l\pm  
  key=Key_Table[m_Key.GetCurSel()]; fk5XvL  
 if(bRegistered){ A%ywj'|z  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); *,#q'!Hq  
  bRegistered=FALSE; IftxSaP  
 } +T_ p8W+j  
 cMask=mask; o;J;*~g  
 cKey=key; [{F%LRCo-  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); (;6s)z  
 return bRegistered; :%_q[}e  
} HdQj?f3  
Li`hdrO'ii  
  四、小结 ]TK=>;&  
3n(*E_n  
  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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