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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: @a>2c$%  
  :@xm-.D  
  一、实现方法 y"<))-MH  
8?O>ZZtu  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: P;8>5;U4-  
Enq|Y$qm  
#pragma data_seg("shareddata") T<joR R  
HHOOK hHook =NULL; //钩子句柄 0T5=W U  
UINT nHookCount =0; //挂接的程序数目 =!UR=Hq  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 /.eeO k  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ?Xo*1Z =  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey <0.$'M~E  
static int KeyCount =0; C*te^3k>B  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 `L5~mb;7*  
#pragma data_seg() h~,JdDV8l*  
qr50E[  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 X$b={]b  
xwZ8D<e-,  
  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: Yy JPHw)Z  
SL&hJs4c'  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR H{c?lT  
cKey,UCHAR cMask) Tv]<SI<B[  
{ LaIJ1jf  
 BOOL bAdded=FALSE; vhT_=:x  
 for(int index=0;index<MAX_KEY;index++){ o{kbc5_  
  if(hCallWnd[index]==0){ HygY>s+3[  
   hCallWnd[index]=hWnd; DtWwG C  
   HotKey[index]=cKey; %T=A{<[`  
   HotKeyMask[index]=cMask; zT* .jv  
   bAdded=TRUE; +wk`;0sA  
   KeyCount++; N_Af3R1_  
   break; eL.7#SIr}  
  } pA#}-S%  
 } (|fm6$  
 return bAdded; z ggB$5  
} YEx)"t8E  
//删除热键 "$5\,  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) a!c[!  
{ W~B5>;y  
 BOOL bRemoved=FALSE; b~C$R[S  
 for(int index=0;index<MAX_KEY;index++){ rspayO<]3  
  if(hCallWnd[index]==hWnd){ ]AS"z<  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ /Go K}W}  
    hCallWnd[index]=NULL; Uo_tUp_Q  
    HotKey[index]=0; i_LF`JhEQT  
    HotKeyMask[index]=0; W:VP1 :  
    bRemoved=TRUE; 8{Fm[ %"  
    KeyCount--; 8?Y['  
    break; i~{ _eQV  
   } ,Ci/xnI  
  } yISD/ g  
 } w*w?S  
 return bRemoved; E}Xka1 Bn  
} N(3R|Ii  
r\9TMg`C  
=FBpo2^QB;  
  DLL中的钩子函数如下: qkP/Nl. u  
q1hMmMi  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) baoD(0d  
{ ^yKY'>T#d  
 BOOL bProcessed=FALSE; AzpV4(:an.  
 if(HC_ACTION==nCode) $ 'QdFkOr  
 { ]&i+!$N_  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 [{<dbW\ 9  
   switch(wParam) 6a>H|"P NE  
   {  E)t  
    case VK_MENU: 4R) |->"  
     MaskBits&=~ALTBIT; 6j8 <Q 2  
     break; jUjr6b"  
    case VK_CONTROL: !m{2WW-  
     MaskBits&=~CTRLBIT; 9-bG<`v\E  
     break; H.O(*Q=  
    case VK_SHIFT: , Ut Hc]  
     MaskBits&=~SHIFTBIT; [ij,RE7,T  
     break; r<L#q)]  
    default: //judge the key and send message 22KI]$D#f  
     break; ?Zyok]s  
   } gw3NS8 A+  
   for(int index=0;index<MAX_KEY;index++){ JK~ m(oQ  
    if(hCallWnd[index]==NULL) P-JfV7(O8  
     continue; +ydm,aKk  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) F}rPY:  
    { 4W\,y_Q o  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); XqR{.jF.  
     bProcessed=TRUE; T"E(  F  
    } ~k4W<   
   } ^,2c-  
  } 5y_"  
  else if((lParam&0xc000ffff)==1){ //有键按下 2N6=8Xy 5K  
   switch(wParam) H=zN[MU  
   { .)8   
    case VK_MENU: C'9 1d7E  
     MaskBits|=ALTBIT; +3bfD  
     break; ? Ekq6uz\)  
    case VK_CONTROL: 1}`LTPW9  
     MaskBits|=CTRLBIT; RyRqH:p)3  
     break; cvAtwQ'  
    case VK_SHIFT: }w!ps{*  
     MaskBits|=SHIFTBIT; U?U(;nSR\A  
     break; j/<??v4F4  
    default: //judge the key and send message udTxNl!  
     break; 6|;0ax4:P  
   } n2;9geq+  
   for(int index=0;index<MAX_KEY;index++){ 6;uBZ &g  
    if(hCallWnd[index]==NULL) Plz-7fy33  
     continue; qCJ=Z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~Y/z=^  
    { TIRHT`"i  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); .~dEUt/|)  
     bProcessed=TRUE; 9Nl* 4  
    } U %:c],Fk  
   } Z[,`"}}hv=  
  } 135Par5v  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 }g,X5v?W  
   for(int index=0;index<MAX_KEY;index++){ z=?0)e(H,  
    if(hCallWnd[index]==NULL) 'rV2Bt,  
     continue; 6hbEO-(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) C"T ,MH  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ?2~U2Ir]:  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 8SD}nFQ  
   } NFoZ4R1gy  
  } cy:;)E>/  
 } $ WFhBak8  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); eECj_eH-  
} !5;t#4=  
I>m;G `  
  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: hrlCKL&  
O~Uw&Bq  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1XnBK$`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); nJ# XVlHc  
>7FSH"8[,  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: E2yz=7sv5  
G(i\'#5+  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) l Z~+u  
{ t61'LCEis  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) @c"yAy^t  
 { h2}am:%mC  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 *7vue"I*Z  
  SaveBmp(); ^X;JT=r  
  return FALSE; U3q5^{0d/  
 } byj[u!{  
 …… //其它处理及默认处理 z`9l<Q/  
} {dZ8;Fy4  
ty;o&w$  
aT/KT,!  
  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。  ,(hY%M&\  
KS>Fl->  
  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。 2wOy}:  
bVmvjY4  
  二、编程步骤 )9pBu B  
Y_shy6" KH  
  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"; }I<N^j=/pO  
H5^Y->  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; & 3I7]Wm  
sRil>6QR  
  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; i0&) N,5_  
%~(~W>^A  
  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; @S}|Ccfc_  
0XQ-   
  5、 添加代码,编译运行程序。 W,'3D~g8  
'h:!m/1  
三、程序代码 fsb=8>}63}  
Pu/lpHm|  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL +wjlAqMQ  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ]J~g'">  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ v7$9QVze  
#if _MSC_VER > 1000 ^AH-+#5  
#pragma once wO\!xW:  
#endif // _MSC_VER > 1000 @>9A$w$H|a  
#ifndef __AFXWIN_H__ v*gLNB,ZH  
#error include 'stdafx.h' before including this file for PCH "x.88,T6  
#endif ?ZM^%]/+  
#include "resource.h" // main symbols `w(sXkeaI  
class CHookApp : public CWinApp cl#OvQ  
{ u> In(7\  
 public: ^"/Dih\_  
  CHookApp(); 4}PeP^pj  
  // Overrides K+t];(  
  // ClassWizard generated virtual function overrides VG#$fRrZ  
  //{{AFX_VIRTUAL(CHookApp) :EaiM J_=  
 public: :=B[y D!  
  virtual BOOL InitInstance(); z+2u-jG  
  virtual int ExitInstance(); =1&}t%<X  
  //}}AFX_VIRTUAL OUKj@~T  
  //{{AFX_MSG(CHookApp) O^Dc&w  
  // NOTE - the ClassWizard will add and remove member functions here. m>+A*M8  
  // DO NOT EDIT what you see in these blocks of generated code ! kt5YgW  
  //}}AFX_MSG $/y%[ .  
  DECLARE_MESSAGE_MAP() 7@\GU]. 2  
}; zh hGqz[K  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); j?d!}v  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^$?7H>=_ha  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); > fhSaeN  
BOOL InitHotkey(); TyyRj4>  
BOOL UnInit(); %!W 6<ioW  
#endif l+'`BBh*]  
AzW%+ LUD  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. dnLo(<{<U  
#include "stdafx.h" N+[}Gb"8q  
#include "hook.h" jFS 'I*1+  
#include <windowsx.h> ^w ]1qjGw  
#ifdef _DEBUG jBGG2[hV  
#define new DEBUG_NEW O\:;q*]  
#undef THIS_FILE Y~}QJ+`?  
static char THIS_FILE[] = __FILE__; orK+B4  
#endif SSo~.)J  
#define MAX_KEY 100 @b>YkJDk  
#define CTRLBIT 0x04 Y# .6d  
#define ALTBIT 0x02 G-ZrM  
#define SHIFTBIT 0x01 V=Ww>  
#pragma data_seg("shareddata") T\.7f~3  
HHOOK hHook =NULL; " Tw0a!  
UINT nHookCount =0; d"Ml^rAn  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey )62q|c9F  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT c@)pKi#W  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey L)j]~^P$-  
static int KeyCount =0; ?cA8P.?^A  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift aslNlH6  
#pragma data_seg() _g^E%@'W  
HINSTANCE hins; oa?!50d  
void VerifyWindow(); 6Eij>{v  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) FDZeIj9uF  
//{{AFX_MSG_MAP(CHookApp) 1'gKZB)TG7  
// NOTE - the ClassWizard will add and remove mapping macros here. 4/ 0/#G#j  
// DO NOT EDIT what you see in these blocks of generated code! #.RG1-L  
//}}AFX_MSG_MAP v_[)FN"]Y.  
END_MESSAGE_MAP() F?!};~$=Z  
fB@K'JQG  
CHookApp::CHookApp() nA|gQibA  
{ 3/ yt*cr  
 // TODO: add construction code here, -DbH6u3  
 // Place all significant initialization in InitInstance GC,vQ\  
} ?T$*5d  
zLE>kK  
CHookApp theApp; AD0ptHUBa  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 1 yxZ  
{ X=-gAutfE=  
 BOOL bProcessed=FALSE; m[//_TFf]  
 if(HC_ACTION==nCode) UA1]o5K  
 { ^/ULh,w!fP  
  if((lParam&0xc0000000)==0xc0000000){// Key up {yul.m  
   switch(wParam) iDyMWlV  
   { yd{Y}.  
    case VK_MENU: "Yc^Nc  
     MaskBits&=~ALTBIT; m1M;'tT@  
     break; u-]vK  
    case VK_CONTROL: 1D 3 dYVE  
     MaskBits&=~CTRLBIT; .eZPp~[lAN  
     break; tRpL0 =y  
    case VK_SHIFT: KY;uO 8Te  
     MaskBits&=~SHIFTBIT; 7<Z~\3x  
     break; g]oc(RM  
    default: //judge the key and send message Ncs4<"{$  
     break; ?HEo9/ *7  
   } '2Mjz6mBDA  
   for(int index=0;index<MAX_KEY;index++){ W o<PmSt9i  
    if(hCallWnd[index]==NULL) ({ :yw  
     continue; .YnP% X=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) GF$rPY[  
    { 8YT_DM5iI  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Rh05W_?Js  
     bProcessed=TRUE; 2^k^"<h5j  
    } [esX{6,i  
   } uyS^W'fF  
  } N{0+C?{_  
  else if((lParam&0xc000ffff)==1){ //Key down )VV4HoH]8  
   switch(wParam) :G6 xJlE|  
   { "W3n BaG  
    case VK_MENU: '=Ip5A{S/  
     MaskBits|=ALTBIT; qcpG}o+&D  
     break; }R?v"6aBS  
    case VK_CONTROL: uM}dZp 1  
     MaskBits|=CTRLBIT; J,(U<%n  
     break; v#T?YK  
    case VK_SHIFT: c1Fru  
     MaskBits|=SHIFTBIT; QI :/,w  
     break; mfp`Iy"}+  
    default: //judge the key and send message dvrvpDoE.  
     break; 5Xq.=/eX  
   } 75^)Ni  
   for(int index=0;index<MAX_KEY;index++) UeK, q>i  
   { 5Tcl<Y6l  
    if(hCallWnd[index]==NULL) S>vVjq?~l(  
     continue; `% #zMS  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ]ouUv7\  
    { )edU <1P  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); CIxVR  
     bProcessed=TRUE; DLg`Q0`M5  
    } Ot4;,UZ  
   } P_^ |KEz  
  } 3=G5(0  
  if(!bProcessed){ y~#R:&d"  
   for(int index=0;index<MAX_KEY;index++){ 7#~m:K@  
    if(hCallWnd[index]==NULL) &zg$H,@Qp  
     continue; v3VLvh 2)n  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) \M3NasZ  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); %i]uW\~U  
   } v"Ud mv"  
  } -?2&5YB  
 } X,C/x)  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); nJM9c[Ou^H  
} y<Z#my$`|n  
(dGM;Dq8  
BOOL InitHotkey() OJC*|kN-#^  
{ E-7a`S  
 if(hHook!=NULL){ y[ rB"  
  nHookCount++; b 'Nvx9=W  
  return TRUE; <or>bo^  
 } {XVf|zM,  
 else }fa%JN %E  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); n79DS(t  
  if(hHook!=NULL) 04T*\G^:=  
   nHookCount++; C6;](rN)N  
  return (hHook!=NULL); %+j]vP  
} s].'@_~s  
BOOL UnInit() F%ylR^H>  
{ 9< 0$mE^:  
 if(nHookCount>1){ l#5k8+s  
  nHookCount--; VES4x%r=  
  return TRUE; :b3l J-dB  
 } IZ(CRKCGBl  
 BOOL unhooked = UnhookWindowsHookEx(hHook); "YdDaj</  
 if(unhooked==TRUE){ |WwFE|<  
  nHookCount=0; ^w.(*;/  
  hHook=NULL; #mz,HK0|aC  
 } .AmM%I4K  
 return unhooked; "< hx  
} s+\qie  
XQg%*Rw+t  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 4d3]pvv  
{ ( _F  
 BOOL bAdded=FALSE; %q\P'cK  
 for(int index=0;index<MAX_KEY;index++){ $/U^/2)  
  if(hCallWnd[index]==0){ Vl QwVe  
   hCallWnd[index]=hWnd; M0"g/W  
   HotKey[index]=cKey; tV}ajs  
   HotKeyMask[index]=cMask; (HX[bG`  
   bAdded=TRUE; K:mL%o2J  
   KeyCount++; : QhEu%e  
   break; "'p+qbT8  
  } ;?L[]Ezzt  
 } aK=3`q  
 return bAdded; 4`'BaUU(  
} %`uRUex  
7.1E mJ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) V2sB[Mw  
{ k`J..f9  
 BOOL bRemoved=FALSE; \kJt@ [w%  
 for(int index=0;index<MAX_KEY;index++){ 0f}Q~d=QL  
  if(hCallWnd[index]==hWnd){ '>lPq tdZ  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ " ih>T^|  
    hCallWnd[index]=NULL; 5Z>pa`_$2  
    HotKey[index]=0; Qd)cFL "v  
    HotKeyMask[index]=0; )V =K#MCK  
    bRemoved=TRUE; m^u&g&^  
    KeyCount--; ~9ls~$+*  
    break; F8r455_W"  
   } ?0)XS<  
  } *t-A6)2  
 } +>9^])K|  
 return bRemoved; OD!CnK  
} %K f . F  
Hn'2'Vu  
void VerifyWindow() t-gNG!B  
{ hq[ gj?P  
 for(int i=0;i<MAX_KEY;i++){ v>cE59('0  
  if(hCallWnd!=NULL){ k2,oyUT=S  
   if(!IsWindow(hCallWnd)){ 1NHoIX  
    hCallWnd=NULL; :8!3*C-=  
    HotKey=0; $6x:aG*F  
    HotKeyMask=0; p'c<v)ia  
    KeyCount--; qYiK bzy  
   } PC(iqL8r  
  } Pge}xKT  
 } 2P> za\  
} 'L+BkE6+%  
9h0,L/;\  
BOOL CHookApp::InitInstance() rZCAj  
{ `g:^KCGMM  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ;7=J U^@D@  
 hins=AfxGetInstanceHandle(); s{EX ;   
 InitHotkey(); Am`A[rV0  
 return CWinApp::InitInstance(); >]08".ajS  
} r^tXr[}  
= (h;L$  
int CHookApp::ExitInstance() b0x0CMf  
{ ^9f`3~!#bc  
 VerifyWindow(); 6XCX#4'i%  
 UnInit(); w\;9&;;  
 return CWinApp::ExitInstance(); *SG2k .$  
} ?g#t3j>zoF  
3&Zx*:  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 5i-;bLm  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) zc~xWy+  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Vwg|?sG_  
#if _MSC_VER > 1000 `} Zbfe~  
#pragma once 1,!\7@<CT  
#endif // _MSC_VER > 1000 yl+)I  
K[yJu 4  
class CCaptureDlg : public CDialog @X><lz  
{ 34M.xB   
 // Construction csA.3|rv  
 public: W%ZU& YBc  
  BOOL bTray; l*MUDT@M8\  
  BOOL bRegistered; v?=VZ~`O(  
  BOOL RegisterHotkey(); P\0%nyOG(%  
  UCHAR cKey; *H<g9<Dn  
  UCHAR cMask; bc}OmPE  
  void DeleteIcon(); ~g6[ [  
  void AddIcon(); c'TLD!^hB  
  UINT nCount; z"C(#Y56 x  
  void SaveBmp(); ij5=f0^4.  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor v7u}nx  
  // Dialog Data hg/&[/eodm  
  //{{AFX_DATA(CCaptureDlg) e>9{36~jh  
  enum { IDD = IDD_CAPTURE_DIALOG }; !td.ks0  
  CComboBox m_Key; _ll aH  
  BOOL m_bControl; / H/Ne )r  
  BOOL m_bAlt; $ttr_4=  
  BOOL m_bShift; 2j BE+k"M  
  CString m_Path; /1 %0A  
  CString m_Number; -t#a*?"$w  
  //}}AFX_DATA <Y'YpH`l  
  // ClassWizard generated virtual function overrides w3UJw  
  //{{AFX_VIRTUAL(CCaptureDlg) _ShJ3\,K  
 public: /4BXF4ksi,  
  virtual BOOL PreTranslateMessage(MSG* pMsg); s(LqhF[N2]  
 protected: qinQ5t  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support r>@/XYK&\  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); O*CX@Ne  
  //}}AFX_VIRTUAL uKzz/Y{  
  // Implementation U>jk`?zW  
 protected: 3;gtuqwD$  
  HICON m_hIcon; ~}ZX^l&k{P  
  // Generated message map functions 1h0ohW  
  //{{AFX_MSG(CCaptureDlg) 'MlC 1HEp  
  virtual BOOL OnInitDialog(); Zpd>' ${4  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 2Yjysn  
  afx_msg void OnPaint(); \uIC<#o"N  
  afx_msg HCURSOR OnQueryDragIcon(); CrQ& -!Eh  
  virtual void OnCancel(); 9@+X?Nhv5  
  afx_msg void OnAbout(); {oeQK   
  afx_msg void OnBrowse(); Nn\\}R  
  afx_msg void OnChange(); I+Cmj]M s0  
 //}}AFX_MSG k~F/Ho+R&  
 DECLARE_MESSAGE_MAP() Vs(Zs[  
}; na; ^/_U@  
#endif :m)?+  
LA0x6E+I  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file @= 9y5r  
#include "stdafx.h" f#MN-1[67  
#include "Capture.h" EmoU7iy  
#include "CaptureDlg.h" Qt39H@c|z~  
#include <windowsx.h> bx6}zkf&  
#pragma comment(lib,"hook.lib") \~1+T  
#ifdef _DEBUG `Pbn  
#define new DEBUG_NEW "7/YhLq7  
#undef THIS_FILE ?OdA`!wE  
static char THIS_FILE[] = __FILE__; \Nyxi7  
#endif l'f!za0  
#define IDM_SHELL WM_USER+1 !+l, m8Hly  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %/C[\w p81  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 'FXZ`+r|  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; _/\H3  
class CAboutDlg : public CDialog =Bx~'RYl1d  
{ !g:UM R  
 public: 7!)%%K.z6  
  CAboutDlg(); 9>P(eN  
  // Dialog Data [! BH3J!  
  //{{AFX_DATA(CAboutDlg) IGQ8-#=  
  enum { IDD = IDD_ABOUTBOX }; y>PbYjuIU  
  //}}AFX_DATA @>ZjeDG>  
  // ClassWizard generated virtual function overrides  e:R[  
  //{{AFX_VIRTUAL(CAboutDlg) UGgi)  
 protected: t9{EO#o' k  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support yh<aFYdk  
  //}}AFX_VIRTUAL =,]M$M  
  // Implementation 2F{IDcJI\  
 protected: YT8`Vz$+  
  //{{AFX_MSG(CAboutDlg) 8A_(]Q  
  //}}AFX_MSG n\Nl2u& m  
  DECLARE_MESSAGE_MAP() /Qy0vAvJ  
}; np(<Ap r  
+ k:?;ZG  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ?Fv(4g  
{ Lo4t:H&  
 //{{AFX_DATA_INIT(CAboutDlg) h^,a 1'  
 //}}AFX_DATA_INIT n4,J#h/  
} %9M49 s  
x$I>e  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) MG>;|*$%  
{ ,//=yW  
 CDialog::DoDataExchange(pDX); X=~QE}x  
 //{{AFX_DATA_MAP(CAboutDlg) #n r1- sf|  
 //}}AFX_DATA_MAP M$9h)3(B  
} y0]O 6.{  
r>o6}Mx$  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Vo[4\h#$  
 //{{AFX_MSG_MAP(CAboutDlg) ,Nh X%  
 // No message handlers *ni|I@8  
 //}}AFX_MSG_MAP k=}hY+/=  
END_MESSAGE_MAP() $_kU)<e3  
uI/ A_  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) LLiX%XOh  
: CDialog(CCaptureDlg::IDD, pParent) |n8^Xsx4w  
{ M`'2 a  
 //{{AFX_DATA_INIT(CCaptureDlg) !hUyX}{`j  
  m_bControl = FALSE; jT',+   
  m_bAlt = FALSE; jL&F7itP  
  m_bShift = FALSE; Sq>UMfl&  
  m_Path = _T("c:\\"); 6yqp<D0SP)  
  m_Number = _T("0 picture captured."); 'z/hj>B<  
  nCount=0; .CYkb8hF  
  bRegistered=FALSE; YR2/`9s\QJ  
  bTray=FALSE; %3wK.tR  
 //}}AFX_DATA_INIT ^gImb`<6-  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Sb.;$Be5g  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); VXp X#O  
} *d 4D9(  
mDUS9>  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) yFjSvm6  
{ r>\.b{wI  
 CDialog::DoDataExchange(pDX); A[MEtI=Q J  
 //{{AFX_DATA_MAP(CCaptureDlg) F2=97 =R  
  DDX_Control(pDX, IDC_KEY, m_Key); cxV3Vrx@A  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); gO%3~f!vY#  
  DDX_Check(pDX, IDC_ALT, m_bAlt); l"/Os_4O  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); =8-e1R/  
  DDX_Text(pDX, IDC_PATH, m_Path); -L@=j  
  DDX_Text(pDX, IDC_NUMBER, m_Number); zuw6YY8kQ  
 //}}AFX_DATA_MAP :O2N'vl47A  
} rcCM x"L=  
:M16ijkx  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) "- AiC6u  
//{{AFX_MSG_MAP(CCaptureDlg) ?FyA2q!  
 ON_WM_SYSCOMMAND() wB@A?&UY  
 ON_WM_PAINT() ,O(uuq  
 ON_WM_QUERYDRAGICON() &I8ZVtg  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) XQ>m8K?\d  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) n7vi@^lf(  
 ON_BN_CLICKED(ID_CHANGE, OnChange) V! p;ME  
//}}AFX_MSG_MAP R4?/7  
END_MESSAGE_MAP() hI$an%Y(  
A]1](VQ)4  
BOOL CCaptureDlg::OnInitDialog() ,b{4GU$3  
{ udMq>s;  
 CDialog::OnInitDialog(); ~p&sd)  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ~9=g"v  
 ASSERT(IDM_ABOUTBOX < 0xF000); V.qB3 V$  
 CMenu* pSysMenu = GetSystemMenu(FALSE); %y'#@%kO:S  
 if (pSysMenu != NULL) WD<M U ]  
 { v2NzPzzyb  
  CString strAboutMenu; S"*wP[d.9  
  strAboutMenu.LoadString(IDS_ABOUTBOX); zKo,B/Ke4  
  if (!strAboutMenu.IsEmpty()) 6Y=)12T  
  { t+t&eg  
   pSysMenu->AppendMenu(MF_SEPARATOR); HzV3O-Qz]  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 7y!{lr=n  
  } WukD|BCC  
 } gU:jx  
 SetIcon(m_hIcon, TRUE); // Set big icon YRFM1?*  
 SetIcon(m_hIcon, FALSE); // Set small icon Dcq^C LPY  
 m_Key.SetCurSel(0); 9#+X?|p+0  
 RegisterHotkey(); pnWDsC~)  
 CMenu* pMenu=GetSystemMenu(FALSE); cOSUe_S0w[  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); TeHR,GB  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ^VD14V3  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 09r.0Ks  
 return TRUE; // return TRUE unless you set the focus to a control M%m$ 5[;n  
} &12.|  
s&4Y+dk93  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) &}<IR\ci  
{ 5Jd,]~KAP  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) yo5|~"yZY  
 { 3LG)s:p$/  
  CAboutDlg dlgAbout; se&:Y&vrc~  
  dlgAbout.DoModal(); cOcm9m#  
 } 5=eGiF;0\  
 else Q/':<QY  
 { :EZTJu  
  CDialog::OnSysCommand(nID, lParam); ne%ckW?ks  
 } Gmc0yRN  
} /J^yOR9  
O3S_P]{*ny  
void CCaptureDlg::OnPaint() mU;TB%#)  
{ 8d-_'MXk3  
 if (IsIconic()) d bw`E"g  
 { Y%2<}3P  
  CPaintDC dc(this); // device context for painting J}BS/Tr}=  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 9i n&\  
  // Center icon in client rectangle b1-JnEc  
  int cxIcon = GetSystemMetrics(SM_CXICON); =KkHck33  
  int cyIcon = GetSystemMetrics(SM_CYICON); JVRK\A|R  
  CRect rect; 6u7>S?  
  GetClientRect(&rect); nCt:n}+C7  
  int x = (rect.Width() - cxIcon + 1) / 2; > #SQDVFf  
  int y = (rect.Height() - cyIcon + 1) / 2; tcfUhSz,I  
  // Draw the icon o}<}zTU  
  dc.DrawIcon(x, y, m_hIcon); R ~#\gMs  
 } f5AK@]4G  
 else 7 yK >  
 { 5E$)Ip  
  CDialog::OnPaint(); L0}"H .  
 } #,Rmu  
} ~Os~pTo  
ip~PF5  
HCURSOR CCaptureDlg::OnQueryDragIcon() ^b'[ 81%  
{ 1 Nv_;p.{  
 return (HCURSOR) m_hIcon; K*>lq|i u  
} 6tVB}UKs  
6#v"+V  
void CCaptureDlg::OnCancel() ZhW>H  
{ Y<l{DmrsA  
 if(bTray) |iJ37QIM  
  DeleteIcon(); BDpeAF8z  
  CDialog::OnCancel(); v*kTTaU&  
} VHJOj  
|:C=j/f   
void CCaptureDlg::OnAbout() !ce:S!P  
{ 1qtu,yIf  
 CAboutDlg dlg; \xwE4K  
 dlg.DoModal(); +c?1\{M   
} XDU&Z2A  
{2A/@$?  
void CCaptureDlg::OnBrowse() z>~Hc8*]3  
{ KnKV+:"  
 CString str; 7Q2"]f,$CQ  
 BROWSEINFO bi; \f .ceh;!  
 char name[MAX_PATH]; bmFnsqo  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); >J+hu;I5  
 bi.hwndOwner=GetSafeHwnd(); )=#QTiJ  
 bi.pszDisplayName=name; ~]3y66 7  
 bi.lpszTitle="Select folder"; zGF_ c9X  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; %R(1^lFI$  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 0@vSl%I+  
 if(idl==NULL) r!'\$(m E  
  return; [;%qxAB/_  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); *s} dtJ  
 str.ReleaseBuffer(); 5\lOZYHX  
 m_Path=str; mJp)nF8r~  
 if(str.GetAt(str.GetLength()-1)!='\\') <GT&q <4w  
  m_Path+="\\"; -:&qNY:Vp  
 UpdateData(FALSE); /aP4'U8ov  
} W&qE_r  
%&0_0BU  
void CCaptureDlg::SaveBmp() ewN!7  
{ zQ&`|kS  
 CDC dc; \:, dWL u  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Cwl#(; @  
 CBitmap bm; ^h1EE=E"  
 int Width=GetSystemMetrics(SM_CXSCREEN); w|7<y8#qC  
 int Height=GetSystemMetrics(SM_CYSCREEN); jw]~g+x#$  
 bm.CreateCompatibleBitmap(&dc,Width,Height); l*rli[No  
 CDC tdc; D=i)AZqMPp  
 tdc.CreateCompatibleDC(&dc); 9v=5x[fE  
 CBitmap*pOld=tdc.SelectObject(&bm); hKj"Lb9 ]  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Tapj7/0`  
 tdc.SelectObject(pOld); _Gv n1"l  
 BITMAP btm; bd_&=VLTC  
 bm.GetBitmap(&btm); gq\ulLyOeZ  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; $n.oY5=\  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); XDRw![H,~  
 BITMAPINFOHEADER bih; M:YtW5{  
 bih.biBitCount=btm.bmBitsPixel; Z(k7&^d  
 bih.biClrImportant=0; )OpB\k  
 bih.biClrUsed=0; d ]R&mp|'  
 bih.biCompression=0; wGr5V!  
 bih.biHeight=btm.bmHeight; E]/` JI'%  
 bih.biPlanes=1; &==X.2XW  
 bih.biSize=sizeof(BITMAPINFOHEADER); hE@s~ ~JYd  
 bih.biSizeImage=size; $)8b)Tb  
 bih.biWidth=btm.bmWidth; gTa6%GM>  
 bih.biXPelsPerMeter=0; ,'N8Ivt  
 bih.biYPelsPerMeter=0; F l@%?  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); {@ ygq-TZ  
 static int filecount=0; b\& |030+  
 CString name; _Z'[-rcXWh  
 name.Format("pict%04d.bmp",filecount++); w a7)  
 name=m_Path+name; ] ;" blB  
 BITMAPFILEHEADER bfh; V~([{  
 bfh.bfReserved1=bfh.bfReserved2=0; N{w)}me[YY  
 bfh.bfType=((WORD)('M'<< 8)|'B'); wC{?@ h  
 bfh.bfSize=54+size; Pv,Q*gh`  
 bfh.bfOffBits=54; LX5, _`B  
 CFile bf; 8$4@U;Vh;  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Y=94<e[f"  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); !(QDhnx}9c  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); #[=%+*Q  
  bf.WriteHuge(lpData,size); D; i%J  
  bf.Close(); T$)N2]FE  
  nCount++; i^ `]TOP  
 } >,;, 6|S  
 GlobalFreePtr(lpData); F-0|&0  
 if(nCount==1) /a@gE^TM  
  m_Number.Format("%d picture captured.",nCount); jG~zpZh  
 else !0p_s;uu,W  
  m_Number.Format("%d pictures captured.",nCount); t|XQFb@}  
  UpdateData(FALSE); fR]%:'2k  
} (nL''#Ka  
vG;)(.:  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) *>"k/XUn$  
{ a8$gXX-2  
 if(pMsg -> message == WM_KEYDOWN) d'y\~M9(  
 { KicPW}_  
  if(pMsg -> wParam == VK_ESCAPE) 9b88):[qO  
   return TRUE; BTi:Bcv k  
  if(pMsg -> wParam == VK_RETURN) -SO`wL NV  
   return TRUE; u^5X@ .  
 } 5^:N]Mp"  
 return CDialog::PreTranslateMessage(pMsg); GO3F[ l  
} %uA\Le  
Wg\`!T  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 01~&H8 =  
{ r92C^h0  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 3"9'MDKH  
  SaveBmp(); n\CQ-*;l  
  return FALSE; [,_4#Zz  
} g3*" ^C2=  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ AiMD"7 )c  
 CMenu pop; oz54IO  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); kWkAfzf4a  
 CMenu*pMenu=pop.GetSubMenu(0); D H}gvV  
 pMenu->SetDefaultItem(ID_EXITICON); vbXZZ  
 CPoint pt; WcE{1&PXx  
 GetCursorPos(&pt); F?>rWP   
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 5 *w a  
 if(id==ID_EXITICON) ah1DuTT/G  
  DeleteIcon(); "'M>%m u  
 else if(id==ID_EXIT) IYb%f T  
  OnCancel(); e<Pbsj  
 return FALSE; ]gxt+'iAFS  
} `/+%mKlC|[  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); kZ^}  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 5|I2  
 AddIcon(); Ws_R S%  
 return res; !%pY)69gv  
} j9sK P]w  
Zjo8/  
void CCaptureDlg::AddIcon() <M//zXa  
{ }digw(  
 NOTIFYICONDATA data; }PdHR00^  
 data.cbSize=sizeof(NOTIFYICONDATA); 0H|U9  
 CString tip; [#}A]1N  
 tip.LoadString(IDS_ICONTIP); A(!nT=0o  
 data.hIcon=GetIcon(0); |(mr&7O  
 data.hWnd=GetSafeHwnd(); 1Tn0$+$.4  
 strcpy(data.szTip,tip); 8UA bTqB-  
 data.uCallbackMessage=IDM_SHELL; %j '_I\  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; OI=LuWGQE1  
 data.uID=98; q(N2 #di  
 Shell_NotifyIcon(NIM_ADD,&data); 32DSZ0  
 ShowWindow(SW_HIDE); }8+rrzMUB  
 bTray=TRUE; pI__<  
} )+' De  
d@ +}_R"c  
void CCaptureDlg::DeleteIcon() "X\|!Mxh  
{ H,/|pP.  
 NOTIFYICONDATA data; $]&0`F  
 data.cbSize=sizeof(NOTIFYICONDATA); qNhV zx  
 data.hWnd=GetSafeHwnd();  zw13Tu  
 data.uID=98; I=N;F6  
 Shell_NotifyIcon(NIM_DELETE,&data); +Lq;0tRC  
 ShowWindow(SW_SHOW); ?A!Lh,  
 SetForegroundWindow(); Mn<G9KR  
 ShowWindow(SW_SHOWNORMAL); me-:A:si  
 bTray=FALSE; cBgdBPDa  
} OokBi 02b  
H9c  
void CCaptureDlg::OnChange() w"-'  
{ ZcTxE]Y  
 RegisterHotkey(); (IAc*V~  
} sd (I@ &y  
?DN4j!/$  
BOOL CCaptureDlg::RegisterHotkey() XIv{jzgF  
{ <"SDU_<xG  
 UpdateData(); Z0f0tL& A<  
 UCHAR mask=0; ?q}XD c  
 UCHAR key=0; Gi<ik~  
 if(m_bControl) ~:65e 8K  
  mask|=4; o6@Hj+,,  
 if(m_bAlt) N8$MAW  
  mask|=2; 9J"Y   
 if(m_bShift) 8,E#vQ55}(  
  mask|=1;  R~jV  
  key=Key_Table[m_Key.GetCurSel()]; \ 2Jr( ?U  
 if(bRegistered){ njz:7]>e  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); k'_p*H  
  bRegistered=FALSE; 8vN}v3HV&  
 } 9fWr{fx  
 cMask=mask; {{FA "NW  
 cKey=key; Dxc`K?M   
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); mY+.(N7m  
 return bRegistered; Y,v8eOo45S  
} J- %YmUc)  
"@xF(fyg  
  四、小结 |+?ABPk"  
{H$F!}a  
  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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