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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: /| nZ)?  
  Dz<"eyB\  
  一、实现方法 <{t*yMr   
f!|$!r*q  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: 3Pj#k|(f[0  
7P& O{tl(  
#pragma data_seg("shareddata") ({"jL*S,q  
HHOOK hHook =NULL; //钩子句柄 A/WmVv6  
UINT nHookCount =0; //挂接的程序数目 \`FpBE_e)  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 KdBE[A-1^M  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 EWcqMD]4u  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey x] e &G!|  
static int KeyCount =0; )SX2%&N  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 @-L4<=$J  
#pragma data_seg() 7GY3 _`  
Cb`2"mpWS  
  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。 Thlqe?  
LSX;|#AI  
  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: 'Gr}<B$A3  
Q+Sx5JUR~  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR vz\^Aa #fv  
cKey,UCHAR cMask) Ng1{ NI+S  
{ SxAZ2|/-  
 BOOL bAdded=FALSE; jrF#DDH?I  
 for(int index=0;index<MAX_KEY;index++){ /h.hFM/  
  if(hCallWnd[index]==0){ |%V-|\GJ~j  
   hCallWnd[index]=hWnd; g>@T5&1q*  
   HotKey[index]=cKey; O]| T !  
   HotKeyMask[index]=cMask; _m;H$N~I#  
   bAdded=TRUE; jcC "S qL  
   KeyCount++; uR;m<wPH,f  
   break; d*M:P jG@  
  } C(4r>TNm  
 } /t4#-vz  
 return bAdded; T@Q,1^?i  
} *bOgRM[  
//删除热键 <-Hw@g  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) z2/E?$(  
{ V2v}F=  
 BOOL bRemoved=FALSE; ?}mbp4+j[  
 for(int index=0;index<MAX_KEY;index++){ q_J)68BR  
  if(hCallWnd[index]==hWnd){  qHU=X"rn  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 4!l%@R>O2  
    hCallWnd[index]=NULL; x{o&nhuk[S  
    HotKey[index]=0; vv  F:  
    HotKeyMask[index]=0; d=*&=r0!C{  
    bRemoved=TRUE; O/N Ed)H!  
    KeyCount--; Q5kf-~Jx+  
    break; KtR*/<7IC  
   } r+yl{  
  } wjRv =[  
 } E1"H( m&6  
 return bRemoved; Xb/W[rcs  
} R&!{3!V  
::&hfHR*P  
lDK<gd  
  DLL中的钩子函数如下: t XbMP  
rQrh(~\:  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) @v:p)|Ne;  
{ (E*pM$  
 BOOL bProcessed=FALSE; /x2MW5H  
 if(HC_ACTION==nCode) xDsB%~  
 { A;ti$jy  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 M%aA1!@/  
   switch(wParam) EN\ uX!  
   {  (mR ;MC  
    case VK_MENU: }O7!>T  
     MaskBits&=~ALTBIT; pS) &d4i  
     break; ]b&"](A  
    case VK_CONTROL: vz87]InI  
     MaskBits&=~CTRLBIT; zCuN 8  
     break; fG`<L;wi  
    case VK_SHIFT: ,cF $_7M  
     MaskBits&=~SHIFTBIT; JvI6+[  
     break; 'Cq)/}0  
    default: //judge the key and send message C7hJE -  
     break; >EJ`Z7E6  
   } "QV?C  
   for(int index=0;index<MAX_KEY;index++){ ZD`9Ez)5  
    if(hCallWnd[index]==NULL) (Y[q2b  
     continue; ;_TPJy  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) vIK+18v7  
    { 7)FI_uW  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Y/Dah*  
     bProcessed=TRUE; Ln3<r&&Jz  
    } |B` mWZ'"  
   } :wR aB7  
  } YU (|i}b  
  else if((lParam&0xc000ffff)==1){ //有键按下 V\=QAN^  
   switch(wParam) HUuZ7jJwf  
   { 3<:m;F*#  
    case VK_MENU: X1N*}@:/  
     MaskBits|=ALTBIT; c_RAtM<n  
     break; @/yQ4Gr  
    case VK_CONTROL: BQ /0z^A  
     MaskBits|=CTRLBIT; Y \oz9tf8  
     break; Eg/=VBtc  
    case VK_SHIFT: 9Z_!}eY2mc  
     MaskBits|=SHIFTBIT; wV& UB@  
     break; dJYW8pcKT  
    default: //judge the key and send message {] Zet}2  
     break; % a9C]?  
   } ymr#OP$<S  
   for(int index=0;index<MAX_KEY;index++){  Xb'UsQ  
    if(hCallWnd[index]==NULL) ! ,v!7I  
     continue; zmEg4v'I  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^5-8'9w  
    { cCWk^lF],  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ~A-1x!YiU  
     bProcessed=TRUE; M<KWx'uV  
    } aplOo[  
   } :TTZ@ q  
  } u@ psVt   
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 s${|A =  
   for(int index=0;index<MAX_KEY;index++){ Scfk] DT  
    if(hCallWnd[index]==NULL) 6Y 4I $[  
     continue; k >aWI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) o$[alh;c+W  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); t(sQw '>  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 '_`O&rbT  
   } &|j^?ro6  
  } tXu_o6]  
 } -sqoE*K[8  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); UwQyAD]Ht  
} jy kY8;4  
8t$w/#'@  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 6t0-u~  
ex}6(;7)O  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ]|#%`p56  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); CdFr YL+F  
k NnI$(H"H  
  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: Dg_AoC  
%Q2<bj]  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) iAWd 9x  
{ __Tg1A  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 3ug-cq  
 { _w\A=6=q|  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 a{deN9Qn  
  SaveBmp(); =4H"&Eu{  
  return FALSE; Kz`g Q|S  
 } { :~&#D  
 …… //其它处理及默认处理 5[\LQtM  
} ]!=,8dY  
D$W09ng-  
tc2e)WZP  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 N*CcJp{Q  
lgL|[ik`  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 n\x@~ SzrX  
)vcyoq  
  二、编程步骤 tI-u@ g  
l^,"^ vz  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; W.O]f.h  
fkjo  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; DGY?4r7>y  
{G^f/%  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 3 %'Y):  
&|8R4l C|  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; )?zlhsu}1;  
c|,6(4j>$  
  5、 添加代码,编译运行程序。 rgOc+[X  
[fjP.kw;J  
三、程序代码 ( ;(DI^Un8  
dRXEF6G  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL FWJhi$\:D]  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) .dvOUt I[  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ -%g&O-i\  
#if _MSC_VER > 1000 L=1~)>mP  
#pragma once |[lmW%  
#endif // _MSC_VER > 1000 BA 9c-Ay  
#ifndef __AFXWIN_H__ ?-HLP%C('  
#error include 'stdafx.h' before including this file for PCH $QB~ x{v@n  
#endif  `[=3_  
#include "resource.h" // main symbols ]3/_?n-"`  
class CHookApp : public CWinApp zP(UaSXz/  
{ d2!A32m  
 public: B{^ojV;]m  
  CHookApp(); G7yR&x^  
  // Overrides m[t4XK  
  // ClassWizard generated virtual function overrides btV Tt5  
  //{{AFX_VIRTUAL(CHookApp) nR2pqaKc  
 public: lz-t+LD@ST  
  virtual BOOL InitInstance(); &0='z  
  virtual int ExitInstance(); Pgp`g.$<  
  //}}AFX_VIRTUAL HLYTt)f}  
  //{{AFX_MSG(CHookApp) }bZcVc2  
  // NOTE - the ClassWizard will add and remove member functions here. !eH9LRp  
  // DO NOT EDIT what you see in these blocks of generated code ! gq+|Hr  
  //}}AFX_MSG S# 9EBw7  
  DECLARE_MESSAGE_MAP() ?8O %k<?  
}; MkCq$MA  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);  erW[q  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); mTsl"A>  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); X-$\DXRIo  
BOOL InitHotkey(); X4bB  
BOOL UnInit(); 0M=U >g)  
#endif M'"@l $[QM  
BnL[C:|  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. S.#IC lV  
#include "stdafx.h" km(Mv  
#include "hook.h" F z 6&.f  
#include <windowsx.h> W_sAk~uK/  
#ifdef _DEBUG |~y>R#u8pm  
#define new DEBUG_NEW 9AGf4tuy  
#undef THIS_FILE *co=<g]4KY  
static char THIS_FILE[] = __FILE__; b# RTHe&X  
#endif }0 BKKU+  
#define MAX_KEY 100 -x)zyq6  
#define CTRLBIT 0x04 7Y?=ijXXx\  
#define ALTBIT 0x02 3S97hn{|=  
#define SHIFTBIT 0x01 M]RbaXZ9  
#pragma data_seg("shareddata") 9t1aR*b&@  
HHOOK hHook =NULL; E<|p9,M  
UINT nHookCount =0; "kHQ}#6r  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey rphfW:  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT -S7y1 )7  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey NdlJdq  
static int KeyCount =0; 7P!Hryy  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift k^vsQ'TD  
#pragma data_seg() IQ`#M~:  
HINSTANCE hins; ^-24S#KE  
void VerifyWindow(); QS*!3? %  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) O6[,K1,  
//{{AFX_MSG_MAP(CHookApp) xMb)4cw}  
// NOTE - the ClassWizard will add and remove mapping macros here. 64hl0'67y  
// DO NOT EDIT what you see in these blocks of generated code! 9~En;e  
//}}AFX_MSG_MAP !}TZmwf'  
END_MESSAGE_MAP() jYv`kt  
'^!1AGF  
CHookApp::CHookApp() a IA9rn  
{ Eed5sm$H  
 // TODO: add construction code here, xXJl Qbs  
 // Place all significant initialization in InitInstance PZDj)x_%B&  
} S5W*,?  
'|9fDzW"]  
CHookApp theApp; rerl-T<3  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) (q@DBb4  
{ )G a%Eg9  
 BOOL bProcessed=FALSE; OjUZ-_J  
 if(HC_ACTION==nCode) &f:"p*=a\  
 { '4L0=G:A<q  
  if((lParam&0xc0000000)==0xc0000000){// Key up me7?   
   switch(wParam) S S/9fT"[  
   { )Hp{8c  
    case VK_MENU: 6^Q Bol  
     MaskBits&=~ALTBIT; _"Bh 3 7  
     break; TCC([  
    case VK_CONTROL: I`~ofq?r  
     MaskBits&=~CTRLBIT; =Z($n: m=*  
     break; + \DGS  
    case VK_SHIFT: CfSpwkg  
     MaskBits&=~SHIFTBIT; {5$.:Y  
     break; U1Z.#ETnM  
    default: //judge the key and send message RO]Vn]qb  
     break; \R6D'Yt  
   } 3%g\)Cs  
   for(int index=0;index<MAX_KEY;index++){ R43yr+p  
    if(hCallWnd[index]==NULL) ^hpdre"  
     continue; ncGg@$E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) L*rND15  
    { *gJ:irah  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ";&5@H|  
     bProcessed=TRUE; \KGi54&Y  
    } sI@y)z  
   } 3Pj 6(cf  
  } zJ*|tw4  
  else if((lParam&0xc000ffff)==1){ //Key down  u Z(vf  
   switch(wParam) rfl-(_3  
   { @-7h}2P Q  
    case VK_MENU: OF4iGFw  
     MaskBits|=ALTBIT; ZW6ZO[`6  
     break; `<0{U]m  
    case VK_CONTROL: !c;Z<@  
     MaskBits|=CTRLBIT; DvBL #iC   
     break; XtJ _po  
    case VK_SHIFT: Q*W`mFul  
     MaskBits|=SHIFTBIT; -*Voui  
     break; SnK#YQCDt  
    default: //judge the key and send message 0#gu7n|J  
     break; KfSI6 Y _  
   } wRa$b  
   for(int index=0;index<MAX_KEY;index++) YH0=Y mU#X  
   { Wsz-#kc\[  
    if(hCallWnd[index]==NULL) 6@"lIKeP  
     continue; N3_rqRd^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ]dx6E6A,  
    { OwdA6it^f  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); B.e3IM0  
     bProcessed=TRUE; V<ZohB?y  
    } K,!"5WrX*  
   } W+F^(SC\  
  } 9]{(~=D7  
  if(!bProcessed){ , ;'y <GA  
   for(int index=0;index<MAX_KEY;index++){ eQiK\iDS  
    if(hCallWnd[index]==NULL) IfeCSK,x  
     continue; Gk!06   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) $P9'"a)Lm  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); yX^/Oc@j  
   } Rh[%UNl  
  } @Kx@ 2#~b  
 } lWVvAoe  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); r#% e$  
} dB{VY+!  
7S +YQ$_  
BOOL InitHotkey() z1-JoZ  
{ W^es"\  
 if(hHook!=NULL){ f1hjU~nJ  
  nHookCount++; zNZ"PYh<u  
  return TRUE; j}uVT2ZE%  
 } G2  
 else zqDG#}3f^  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); STr&"9c  
  if(hHook!=NULL) zKnHo:SV  
   nHookCount++; 'S[&-D%(3  
  return (hHook!=NULL); L~WC9xguDl  
} a*qf\ &Vb|  
BOOL UnInit() Hn- k*Y/P  
{ +d$l1j  
 if(nHookCount>1){ 62}rZVJq  
  nHookCount--; Y[0  
  return TRUE; 7sC8|+  
 } $@ous4&  
 BOOL unhooked = UnhookWindowsHookEx(hHook); uT#MVv~.  
 if(unhooked==TRUE){ e >OYJd0s  
  nHookCount=0; mYE8]4  
  hHook=NULL; U{)|z-n  
 } BEm~o#D  
 return unhooked; RPXkf71iM  
} q h+c}"4m  
gz,x6mnQ  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ~> xVhd  
{ !oJ226>WI  
 BOOL bAdded=FALSE; ^GyGh{@,f  
 for(int index=0;index<MAX_KEY;index++){ $bGe1\  
  if(hCallWnd[index]==0){ kVH^(Pi  
   hCallWnd[index]=hWnd; r"%uP[H  
   HotKey[index]=cKey; UP8=V>T02  
   HotKeyMask[index]=cMask; 5bfd8C  
   bAdded=TRUE; uB`H9  
   KeyCount++; S7I8BS[*v  
   break; :k-(%E](  
  } VSxls  
 } cNd;qO0$  
 return bAdded; 4X()D {uR  
} %Ob#GA+  
MPn 6sf9M  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) $69ef[b  
{ m^9[k,;K  
 BOOL bRemoved=FALSE; [pc6!qhDG&  
 for(int index=0;index<MAX_KEY;index++){ W@T_-pTCjK  
  if(hCallWnd[index]==hWnd){ ThvVLK  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ e%B;8)7  
    hCallWnd[index]=NULL; ~&UfnO  
    HotKey[index]=0; tW=,o&C=  
    HotKeyMask[index]=0; ftw@nQNU  
    bRemoved=TRUE; aCwb[7N  
    KeyCount--; kY$vPHZpN  
    break; SviGLv;oR  
   } #nzVgV]  
  }  .L vg $d  
 } bsn.HT"5  
 return bRemoved; qMA K"%x  
} ,rO>5$w.  
jgkJF[t`  
void VerifyWindow() #Q6.r.3@x  
{ cc$L56q  
 for(int i=0;i<MAX_KEY;i++){ #Fl5]> |  
  if(hCallWnd!=NULL){ UImd* ;2TE  
   if(!IsWindow(hCallWnd)){ HgY#O r(  
    hCallWnd=NULL; =s\RK   
    HotKey=0; Py3Y*YP  
    HotKeyMask=0; 0VA$ Ige  
    KeyCount--; ?puZqVu5  
   } IhRYV`:  
  } -%h0`hOG{  
 } 60A E~  
} UP*\p79oO  
nj@l5[  
BOOL CHookApp::InitInstance() +dt b~M  
{ cSkJlhwNn  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); }'FNGn.~#  
 hins=AfxGetInstanceHandle(); C8J3^ ?7E  
 InitHotkey(); >`@c9 m  
 return CWinApp::InitInstance(); tR;? o,T  
} s*XwU  
b')Lj]%;k  
int CHookApp::ExitInstance() :Hn*|+'  
{ ^LO`6,   
 VerifyWindow(); \k8|3Y~g  
 UnInit(); 9qqzCMrI0e  
 return CWinApp::ExitInstance(); Y?^1=9?6  
} '%D$|)  
/{j")  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file oI!L2  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Sv E|"  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_  <0,szw  
#if _MSC_VER > 1000 s[ CnJZ\q  
#pragma once 0( s io\  
#endif // _MSC_VER > 1000 H/eyc`  
bay7%[BLB  
class CCaptureDlg : public CDialog f\Fk+)e@  
{ :=<0Z1S  
 // Construction e2onR~Cf  
 public: H"_]Hq  
  BOOL bTray; 9Xr@ll  
  BOOL bRegistered; RZV8{  
  BOOL RegisterHotkey(); nhUL{ER  
  UCHAR cKey; ^J([w~&  
  UCHAR cMask; uAWmg8  
  void DeleteIcon(); gEE6O%]g  
  void AddIcon(); CUS^j  
  UINT nCount; z_jTR[dY  
  void SaveBmp(); "DW; 6<m  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor )k@+8Yfa1p  
  // Dialog Data Sb9In_* 0  
  //{{AFX_DATA(CCaptureDlg) Ww }qK|D  
  enum { IDD = IDD_CAPTURE_DIALOG }; \[-z4Fxg|'  
  CComboBox m_Key; r RfPq  
  BOOL m_bControl; !*U#,qY  
  BOOL m_bAlt; LB)sk$)  
  BOOL m_bShift; 0B4&!J  
  CString m_Path; ^w+jPT-n  
  CString m_Number; R]-$]koQO  
  //}}AFX_DATA NW$C1(oT  
  // ClassWizard generated virtual function overrides ice7J2r_  
  //{{AFX_VIRTUAL(CCaptureDlg) &|:T+LVv$+  
 public: zW@OSKq4  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Z1(-FT6O  
 protected: )"&$.bWn  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ic"n*SZa  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Ul<'@A8  
  //}}AFX_VIRTUAL lu GEBPi  
  // Implementation )< 6zbG  
 protected: GisI/Ir[  
  HICON m_hIcon; /R_*u4}iD  
  // Generated message map functions s1[_Pk;!  
  //{{AFX_MSG(CCaptureDlg) B>^5h?(lt  
  virtual BOOL OnInitDialog(); +UK".  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); )A`Zgg'L7D  
  afx_msg void OnPaint(); ]Tje6i F  
  afx_msg HCURSOR OnQueryDragIcon(); gAx8r-` `  
  virtual void OnCancel(); U2tsHm.O  
  afx_msg void OnAbout(); `q ;79t  
  afx_msg void OnBrowse(); I) $of9   
  afx_msg void OnChange(); )P{I<TBI;  
 //}}AFX_MSG tGKIJ`w*h  
 DECLARE_MESSAGE_MAP() ~~.v*C[  
}; U#B,Q6~  
#endif C~2/ 5  
[":[\D'  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file :qx>P_&y}z  
#include "stdafx.h" Z66b>.<8  
#include "Capture.h" [7gyF}*;  
#include "CaptureDlg.h" M!=WBw8Y]a  
#include <windowsx.h> gc'C"(TO(  
#pragma comment(lib,"hook.lib") cI)XXb4  
#ifdef _DEBUG ;x[F4d  
#define new DEBUG_NEW ;|2h&8yX(/  
#undef THIS_FILE sP0pw]!  
static char THIS_FILE[] = __FILE__; dBV^Khf J  
#endif x 5u.D^  
#define IDM_SHELL WM_USER+1 iL-I#"qT,  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); XUD/\MoV  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Y$^x.^dT,  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 7]_lSYwrb  
class CAboutDlg : public CDialog TtL2}Wdd.%  
{ &`a$n2ycy  
 public: tQ7DdVdix  
  CAboutDlg(); gT K5z.]  
  // Dialog Data 8s4y7%,|  
  //{{AFX_DATA(CAboutDlg) 5 zlgmCGow  
  enum { IDD = IDD_ABOUTBOX }; 2a;vLc4  
  //}}AFX_DATA +$)C KC  
  // ClassWizard generated virtual function overrides B| IQ/g?  
  //{{AFX_VIRTUAL(CAboutDlg) i<g|+}I  
 protected: O&# bC  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support <v?9:}  
  //}}AFX_VIRTUAL )x.}B4z  
  // Implementation k_9tz}Z  
 protected: p[(VhbN  
  //{{AFX_MSG(CAboutDlg) Ejdw"P"  
  //}}AFX_MSG PN{l)&K2.  
  DECLARE_MESSAGE_MAP() +#5nk,1c>  
}; j+3~  
]JX0:'x^  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) s,TKC67.%+  
{ 5/Ng!bW  
 //{{AFX_DATA_INIT(CAboutDlg) PXGS5,  
 //}}AFX_DATA_INIT ]McLace&  
} ]1 #&J(  
gmfux b/  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) \s2hep  
{ -ob_]CKtJ~  
 CDialog::DoDataExchange(pDX); ZdEeY|j  
 //{{AFX_DATA_MAP(CAboutDlg) u93=>S  
 //}}AFX_DATA_MAP TB] %?L:  
} lrjlkgSN  
,P^pDrc  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)  Z*d8b  
 //{{AFX_MSG_MAP(CAboutDlg) #&.& Uu$  
 // No message handlers d:0RDK-}s  
 //}}AFX_MSG_MAP AElx #` T  
END_MESSAGE_MAP() [L1pDICoy  
>n@?F[Y  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) oK h#th  
: CDialog(CCaptureDlg::IDD, pParent) ;T2)nSAqt  
{ wTFM:N  
 //{{AFX_DATA_INIT(CCaptureDlg) 'kc_OvVA  
  m_bControl = FALSE; /)SwQgK#  
  m_bAlt = FALSE; ?@9kVB*|  
  m_bShift = FALSE; 9<5SQ  
  m_Path = _T("c:\\"); { p {a0*$5  
  m_Number = _T("0 picture captured."); Q>nq~#3?  
  nCount=0; ZVpMR0!  
  bRegistered=FALSE; [ADr _  
  bTray=FALSE; 9`\hG%F  
 //}}AFX_DATA_INIT )2}{fFa%  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 -6MgC9]  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); aG?ko*A;  
} SoODss~X  
i^(_Gk  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) vy#n7hdCc  
{ wKhuUZj{  
 CDialog::DoDataExchange(pDX); 4KE"r F  
 //{{AFX_DATA_MAP(CCaptureDlg) SU"-%}~O#,  
  DDX_Control(pDX, IDC_KEY, m_Key); CGIcuHp  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); $]4^ENkI  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ll {jE  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); e#K =SV!H  
  DDX_Text(pDX, IDC_PATH, m_Path); H,qIHQW#  
  DDX_Text(pDX, IDC_NUMBER, m_Number); hG cq>Cvf  
 //}}AFX_DATA_MAP #d%'BUde  
} fGJPZe  
d$s1l  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) .ag4i;hS8  
//{{AFX_MSG_MAP(CCaptureDlg) @L^2VVWk^  
 ON_WM_SYSCOMMAND() \t'(&taX<  
 ON_WM_PAINT()  IpY  R  
 ON_WM_QUERYDRAGICON() \4I1wdd|^  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Y((s<]7  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) %y33evX/B  
 ON_BN_CLICKED(ID_CHANGE, OnChange) E;~gQ6vAI  
//}}AFX_MSG_MAP Qvs}{h/  
END_MESSAGE_MAP() ,+P!R0PNH  
o=?sMq1<  
BOOL CCaptureDlg::OnInitDialog() 7]Y Le+Ds  
{ <3z]d?u  
 CDialog::OnInitDialog(); AJSe +1  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); PJN TIa  
 ASSERT(IDM_ABOUTBOX < 0xF000); au2 ieZZ[  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ; A~S){  
 if (pSysMenu != NULL) oju7<b9Ez  
 { ?b2  
  CString strAboutMenu; F ^Rt 6Io  
  strAboutMenu.LoadString(IDS_ABOUTBOX); >/1N#S#9  
  if (!strAboutMenu.IsEmpty()) %\=5,9A\  
  { 8Cz_LyL  
   pSysMenu->AppendMenu(MF_SEPARATOR); QRXsLdf$$  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); HDYr?t~V  
  } CfQOG7e@  
 } ./mh 9ax  
 SetIcon(m_hIcon, TRUE); // Set big icon bT}P":*y  
 SetIcon(m_hIcon, FALSE); // Set small icon CQ2{5  
 m_Key.SetCurSel(0); EtJyI&7VK  
 RegisterHotkey(); * 7.!"rb8A  
 CMenu* pMenu=GetSystemMenu(FALSE); Gvv~P3Dm  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); i4 KW  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 7 2ux3D  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); VYkOJAEBg  
 return TRUE; // return TRUE unless you set the focus to a control -_.)~ )P  
} *PE 1)bF  
 @jO3+  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) j]}A"8=1  
{ XodA(73`i  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) M~w =ZJ@  
 { v0|A N  
  CAboutDlg dlgAbout; fM?HZKo  
  dlgAbout.DoModal(); 0/S|P1!b  
 } BFt?%E/]  
 else B#AAG*Ai8  
 { |r1\  
  CDialog::OnSysCommand(nID, lParam); n[lf==R  
 } Qn(e[ C6\  
} C_=! ( @`8  
LYNd^}  
void CCaptureDlg::OnPaint() :U)q(.53  
{ \%=\_"^?  
 if (IsIconic()) ln)_Jf1r  
 { 8s pGDg\g  
  CPaintDC dc(this); // device context for painting CL|t!+wU/  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); _KC)f'Cx  
  // Center icon in client rectangle Oga0CR_  
  int cxIcon = GetSystemMetrics(SM_CXICON); }9t$Cs%  
  int cyIcon = GetSystemMetrics(SM_CYICON); IBb3A  
  CRect rect; (%"M% Qko  
  GetClientRect(&rect); P0S ;aE  
  int x = (rect.Width() - cxIcon + 1) / 2; UvRa7[<y%%  
  int y = (rect.Height() - cyIcon + 1) / 2; (Mhj-0xf$  
  // Draw the icon Ev%4}GwO4  
  dc.DrawIcon(x, y, m_hIcon); 5Tluxt71  
 } XP *pYN  
 else Q^/66"Z:Z  
 { CFAz/x@%  
  CDialog::OnPaint(); G+ PBV%gE[  
 } [c]X) @#S  
} #o_`$'>  
12DMb9_rp  
HCURSOR CCaptureDlg::OnQueryDragIcon() [t5:4 Iq  
{ 1@RctI_}  
 return (HCURSOR) m_hIcon; S9}P 5;u  
} g4!zH};n  
_,_>B8  
void CCaptureDlg::OnCancel() o0&jel1a  
{ |Y|{9Osus  
 if(bTray) B;Ab`UX#t  
  DeleteIcon(); 5WgdgDb@L  
  CDialog::OnCancel(); DtG><g}[]  
} |1X^@  
~Y@(  
void CCaptureDlg::OnAbout() e4u$+  
{ &e@2zfl7  
 CAboutDlg dlg; mza1Q~<  
 dlg.DoModal(); +"6_rbeuO  
} /lkIbmV  
HT)b3Ws~M8  
void CCaptureDlg::OnBrowse() ]Gm,sp.x  
{ }"wWSPD  
 CString str; B5*{85p(u  
 BROWSEINFO bi; +u' ?VBv  
 char name[MAX_PATH]; U0t/(Jyg  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); j!GJ$yd=-6  
 bi.hwndOwner=GetSafeHwnd(); }legh:/*?O  
 bi.pszDisplayName=name; X+;Ivx  
 bi.lpszTitle="Select folder"; sy+1xnz  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; )(TaVHJR  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ~?m';  
 if(idl==NULL) Yv }G"-=  
  return; _JOrGVmD  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); aAiSP+#  
 str.ReleaseBuffer(); #P=rP=  
 m_Path=str; &}@U#w]l  
 if(str.GetAt(str.GetLength()-1)!='\\') R8P7JY[h  
  m_Path+="\\"; G$ XvxJ  
 UpdateData(FALSE); ~V[pu  
} B-ReBtN  
)+RTA y[k  
void CCaptureDlg::SaveBmp() 1O*5>dkX;%  
{ YpoO:  
 CDC dc; EWNh:<F?  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); zm) ]cq  
 CBitmap bm; db$Th=s[  
 int Width=GetSystemMetrics(SM_CXSCREEN); zvYkWaa_Qz  
 int Height=GetSystemMetrics(SM_CYSCREEN); xu(5U`K  
 bm.CreateCompatibleBitmap(&dc,Width,Height); L0ig%  
 CDC tdc; E ;65kZ  
 tdc.CreateCompatibleDC(&dc); y[Zl,v7  
 CBitmap*pOld=tdc.SelectObject(&bm); S-WD?BF C  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); _O2},9L n  
 tdc.SelectObject(pOld); =($RT  
 BITMAP btm; @'j=oTT  
 bm.GetBitmap(&btm); ` `j..v,  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; D% } ?l  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); s$css{(ek  
 BITMAPINFOHEADER bih; ,@jRe&6  
 bih.biBitCount=btm.bmBitsPixel; Kl GPu GL  
 bih.biClrImportant=0; j9u/R01d  
 bih.biClrUsed=0; _7#Ng@#\  
 bih.biCompression=0; ]3wg-p+  
 bih.biHeight=btm.bmHeight; sufidi  
 bih.biPlanes=1; _"SE^_&c  
 bih.biSize=sizeof(BITMAPINFOHEADER); Ke '?  
 bih.biSizeImage=size; rCi7q]_  
 bih.biWidth=btm.bmWidth; [H)NkR;I  
 bih.biXPelsPerMeter=0; v]\io#   
 bih.biYPelsPerMeter=0; eyf\j,xP&  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); iM+K&\{_h  
 static int filecount=0; fu'iG7U M  
 CString name; %l%5Q;t  
 name.Format("pict%04d.bmp",filecount++); -hj@^Auf  
 name=m_Path+name; #Mw|h^ Wm  
 BITMAPFILEHEADER bfh; \c3zK|^  
 bfh.bfReserved1=bfh.bfReserved2=0; ^ }Rqe  
 bfh.bfType=((WORD)('M'<< 8)|'B'); A|1 TE$  
 bfh.bfSize=54+size; +gqtW8 6  
 bfh.bfOffBits=54; \.y|=Ql_u  
 CFile bf; 0H,1"~,w]  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ {%5k1,/(  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); jm0J)Z_"nr  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); *#-X0}'s  
  bf.WriteHuge(lpData,size); DKgwi'R  
  bf.Close(); BlUl5mP}>  
  nCount++; m6tbN/EJZ  
 } {i y[8eLg  
 GlobalFreePtr(lpData); 3 XdN \xc  
 if(nCount==1) @-nCK Yj  
  m_Number.Format("%d picture captured.",nCount);  98eiYh  
 else 8 P85qa@w  
  m_Number.Format("%d pictures captured.",nCount); EM!#FJh  
  UpdateData(FALSE); h~haA8i?{  
} ?rID fEvV  
%7%7 W*0d  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg)  {I+   
{ 6I GUp  
 if(pMsg -> message == WM_KEYDOWN) / 1 lIV_Z  
 { s `fIeP  
  if(pMsg -> wParam == VK_ESCAPE) ;cd{+0  
   return TRUE; Yn4c6K  
  if(pMsg -> wParam == VK_RETURN) </F@ 5*  
   return TRUE; 0&T0Ls#4  
 } l[lUmE  
 return CDialog::PreTranslateMessage(pMsg); P/snzm|@  
} ^N}zePy0  
O 4@sN=o  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) hNs970i  
{ D,%R[F? 5O  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ g\;AU2?p7  
  SaveBmp(); 3kFSu  
  return FALSE; w^MU$ubx  
} }MAQhXI^O|  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ufAp 7m@ud  
 CMenu pop; =<w6yeko  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); d!kiWmw,  
 CMenu*pMenu=pop.GetSubMenu(0); 6, \i0y5n  
 pMenu->SetDefaultItem(ID_EXITICON); JR{3n*  
 CPoint pt; <Z5ak4P  
 GetCursorPos(&pt); KD?~ hpg  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); `l,=iy$  
 if(id==ID_EXITICON) @Aa$k:_  
  DeleteIcon(); !]1X0wo\  
 else if(id==ID_EXIT) k_%2Ok   
  OnCancel(); b);Pw"_2  
 return FALSE; RaT(^b(  
} n B4)%  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Y,EReamp  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) dd1m~Gm  
 AddIcon(); W$LaXytmak  
 return res; U;Z6o1G  
} dK'?<w$  
V&`\ s5Q  
void CCaptureDlg::AddIcon() x)0g31 4 9  
{ 9t@^P^}=\m  
 NOTIFYICONDATA data; TxAT ))  
 data.cbSize=sizeof(NOTIFYICONDATA); &os9K)  
 CString tip; 9 2_F8y*D  
 tip.LoadString(IDS_ICONTIP); # D"TY-$.=  
 data.hIcon=GetIcon(0); T P'  
 data.hWnd=GetSafeHwnd(); 9n{tbabJ  
 strcpy(data.szTip,tip); hZ2!UW4'  
 data.uCallbackMessage=IDM_SHELL; F{}mlQg  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; iTsmUq<b]l  
 data.uID=98; Qj: D=j8  
 Shell_NotifyIcon(NIM_ADD,&data); ' 7G'R  
 ShowWindow(SW_HIDE); <,p|3p3  
 bTray=TRUE; *O-1zIlp  
} ?95^&4Oh0  
kG_ K&,;@  
void CCaptureDlg::DeleteIcon() gX<"-,5jc  
{ N: 'v^0  
 NOTIFYICONDATA data; ?8[,0l:|  
 data.cbSize=sizeof(NOTIFYICONDATA); +7n;Bsk _  
 data.hWnd=GetSafeHwnd(); `<&RZB2  
 data.uID=98; cPA-EH  
 Shell_NotifyIcon(NIM_DELETE,&data); tiG=KHK%o  
 ShowWindow(SW_SHOW); *A C){M  
 SetForegroundWindow(); dr0<K[S_  
 ShowWindow(SW_SHOWNORMAL); kbzzage6L  
 bTray=FALSE; IJHNb_Cku  
} @ hH;d\W#  
2[f8"'lUQ  
void CCaptureDlg::OnChange() ?dMyhU}  
{ z{:T~s  
 RegisterHotkey(); P#-9{T   
} y<mmv~=  
$;NxO0$  
BOOL CCaptureDlg::RegisterHotkey() -q1vB8gjj  
{ 5W"&$6vj  
 UpdateData(); ~]f+   
 UCHAR mask=0; KdU!wsKfG  
 UCHAR key=0; &!> )EHGV  
 if(m_bControl) ,l`4)@{G  
  mask|=4; x95[*[  
 if(m_bAlt) t mAj  
  mask|=2; g a|RW0  
 if(m_bShift) bM7y}P5`1  
  mask|=1; ~]X4ru5,4  
  key=Key_Table[m_Key.GetCurSel()]; ]la8MaZ<  
 if(bRegistered){ J J@O5  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 5BKga1Q  
  bRegistered=FALSE; $g&,$7}O_  
 } !G E-5\*  
 cMask=mask; I;iJa@HWQ  
 cKey=key; SrGX4  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); P2_UQ  
 return bRegistered; tDj~+lmdN  
} y ,][  
!K a!f1  
  四、小结 Zwj\Hz.  
S1oRMd)r  
  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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