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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: |#yH,f  
  >:HmIW0PLe  
  一、实现方法 [Qcht,\^v  
Z@} qL1  
  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: bvS6xU- J  
?AK`M #M  
#pragma data_seg("shareddata") q _Z+H4  
HHOOK hHook =NULL; //钩子句柄 </2 aQn  
UINT nHookCount =0; //挂接的程序数目 -5JN`  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ["[v  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 glLoYRTi  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey %77uc9}  
static int KeyCount =0; d,toUI  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 gloJ;dE B  
#pragma data_seg() d/!\iLF  
i` Q&5KL  
  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。 ;8a9S0eS  
~LQzt@G4  
  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: h"nhDART<  
R3%%;`c=  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR aYn5AP'PH  
cKey,UCHAR cMask) k-^le|n9  
{ RL3*fRlb  
 BOOL bAdded=FALSE; %SuELm  
 for(int index=0;index<MAX_KEY;index++){ .><-XJ  
  if(hCallWnd[index]==0){ D -d  
   hCallWnd[index]=hWnd; x#gZC 1$Y  
   HotKey[index]=cKey; fUr%@&~l^  
   HotKeyMask[index]=cMask; <@P. 'rE  
   bAdded=TRUE; %%N T m  
   KeyCount++; xkv%4H>  
   break; XJ5@/BW  
  } .f"1(J8  
 } RLZfXXMn  
 return bAdded; |<'6rJ[i>  
} Em !%3C1r  
//删除热键 "$pbK:  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) +abb[  
{ $JUkw sc  
 BOOL bRemoved=FALSE; ja9=b?]0,  
 for(int index=0;index<MAX_KEY;index++){ S`$%C=a.  
  if(hCallWnd[index]==hWnd){ 4XAs^>N+  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ V0BT./ B\<  
    hCallWnd[index]=NULL; lV$CBS  
    HotKey[index]=0; t<ZBp0  
    HotKeyMask[index]=0; ==Xy'n9'  
    bRemoved=TRUE; wl&T9O;?  
    KeyCount--; Qj|rNeM_  
    break; zw+RDo  
   } 3!$+N\ #w  
  } =fJU+N+<  
 } D,Gv nfY  
 return bRemoved; h3-^RE5\`S  
} b.v +5=)B  
r8?p6E  
1wFW&|>1  
  DLL中的钩子函数如下: S~)`{ \  
xy b=7  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) mPHto-=fB  
{ qoOwR[NDcq  
 BOOL bProcessed=FALSE; qYJ<I'Ux O  
 if(HC_ACTION==nCode) 3n)$\aBE  
 { / g{8  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 a"X h  
   switch(wParam) dNhb vzl(  
   {  CAC%lp  
    case VK_MENU: z~3GgR"1d  
     MaskBits&=~ALTBIT; 1YQYZ^11  
     break; AwjXY,2  
    case VK_CONTROL: '%wSs,HD  
     MaskBits&=~CTRLBIT; v? OUd^  
     break;  %S%IW  
    case VK_SHIFT: q ajZ~oB{  
     MaskBits&=~SHIFTBIT; Wy}^5]R0E  
     break; 3E^qh03(  
    default: //judge the key and send message n}_}#(a  
     break; Rk7F;2  
   } .{\eco  
   for(int index=0;index<MAX_KEY;index++){ w^Yo)"6  
    if(hCallWnd[index]==NULL) Vjs'|%P7  
     continue; {kw% 7}!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &bz% @p;  
    { }I-nT!D'y  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); g(W+[kj)  
     bProcessed=TRUE; >}\s-/  
    } >$TvCw  
   } "[!b5f3!I  
  } v/9DD%An  
  else if((lParam&0xc000ffff)==1){ //有键按下 H`'a|Y  
   switch(wParam) w7.,ch  
   { T.3{}230<  
    case VK_MENU: $y&W:  
     MaskBits|=ALTBIT; 8["%e#%`$  
     break; pZ}B/j  
    case VK_CONTROL: ]J'TebP=L5  
     MaskBits|=CTRLBIT; =Y81h-  
     break; *asv^aFpS  
    case VK_SHIFT: ,dR.Sac v  
     MaskBits|=SHIFTBIT; z=) m6\  
     break; V:'F_/&X?  
    default: //judge the key and send message ZnRT$ l O  
     break; *Z^`H!&  
   }  5{oc  
   for(int index=0;index<MAX_KEY;index++){ 8QK8q: |  
    if(hCallWnd[index]==NULL) JRw,${W  
     continue; ?tL'  X  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) J@2wPKh?Yp  
    { |Z94@uB  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ||>4XDV#  
     bProcessed=TRUE; '/NpmNY:L  
    } w2UEU5%  
   } hPSMPbI  
  } :CW^$Zvq  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ""jW'%wR  
   for(int index=0;index<MAX_KEY;index++){ %jy$4qAf%  
    if(hCallWnd[index]==NULL) in/~' u  
     continue; S'8+jY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) KD ,3U/ 3  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); wpuK?fP  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 aqN{@|  
   } \OtreYi  
  } bf0,3~G,P  
 } o+&Om~W  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); T>'O[=UWh  
} d}zh.O5P!  
^n0;Q$\  
  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: \.}T_,I  
XQ9W y  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); V%s7*`U  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  Q&xH  
WM?-BIlT=  
  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: ioD8-  
9Z!n!o7D  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ;W|NG3_y  
{ 05R"/r*  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) U,#x\[3!Jt  
 { lQ`=PFh  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 :>{!%-1Z  
  SaveBmp(); pQBn8H|Y  
  return FALSE; #| _VN %!  
 } n}.e(z_"  
 …… //其它处理及默认处理 Hs'~) T  
} gAWi&  
XJ\R'?j  
DOJydYds  
  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。 9>w~B|/  
dhob]8b  
  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。 IZj`*M%3  
olv?$]  
  二、编程步骤 o& FOp'  
rL1yq|]I  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; HvG %##  
'~&W'='b;  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; @6yc^DAA  
6wh PW .  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; ?iP7Ki  
Pgr2 S I  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; @d0f+9d  
7/IL" D  
  5、 添加代码,编译运行程序。 Q}@t'  
kZz'&xdv'.  
三、程序代码 {WrEe7dLy  
I{cH$jt<  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL K 77iv  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) G-T^1?  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ c%/b*nQ(=  
#if _MSC_VER > 1000 >|A,rE^Ojt  
#pragma once S[3"?$3S  
#endif // _MSC_VER > 1000 W:]2T p  
#ifndef __AFXWIN_H__ e9{0hw7  
#error include 'stdafx.h' before including this file for PCH t<Yi!6  
#endif "jum*<QZz  
#include "resource.h" // main symbols PiKP.  
class CHookApp : public CWinApp o@zxzZWg  
{ 6]b"n'G  
 public: aNEah  
  CHookApp(); uKP4ur@1  
  // Overrides FSA%,b; U  
  // ClassWizard generated virtual function overrides \uOM,98xS  
  //{{AFX_VIRTUAL(CHookApp) uVn"L:_  
 public: Ah wi  
  virtual BOOL InitInstance(); sWo`dZ\6WB  
  virtual int ExitInstance(); \s&Mz;:  
  //}}AFX_VIRTUAL -p_5T*R  
  //{{AFX_MSG(CHookApp) d=xjLbsZ  
  // NOTE - the ClassWizard will add and remove member functions here. _J!^iJ  
  // DO NOT EDIT what you see in these blocks of generated code ! h5'hP>b#  
  //}}AFX_MSG &|Duc} t  
  DECLARE_MESSAGE_MAP() ?"9h-g3`x}  
}; Lmte ~oBi  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); *yRsFC{,  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); (p%|F`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); W]oD(eZ  
BOOL InitHotkey(); z)^|.  
BOOL UnInit(); 2/*u$~  
#endif xc#t8`  
N x&/p$d  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ~|} ]  
#include "stdafx.h" B[@q.n  
#include "hook.h" 9O3#d  
#include <windowsx.h> %LMpErZO  
#ifdef _DEBUG +Umsr  
#define new DEBUG_NEW R|C`  
#undef THIS_FILE tr<f ii 3<  
static char THIS_FILE[] = __FILE__; `HRL .uX  
#endif 6#+&/ "*  
#define MAX_KEY 100 9Y,JYc#  
#define CTRLBIT 0x04 GP%V(HhN  
#define ALTBIT 0x02 2xLtJR4L  
#define SHIFTBIT 0x01 1X2j%q I&  
#pragma data_seg("shareddata") U9:)qvMXe  
HHOOK hHook =NULL; 4[$:KGh3  
UINT nHookCount =0; _U^[h!  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey }d?;kt  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT GJ*IH9YR  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey O%T?+1E  
static int KeyCount =0; " !EnQB=  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift eK:?~BI!  
#pragma data_seg() #-'`Yb w  
HINSTANCE hins; P?h1nxm`'  
void VerifyWindow(); T/'z,,Y  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) $IE}fgA@5  
//{{AFX_MSG_MAP(CHookApp) QXZXj#`  
// NOTE - the ClassWizard will add and remove mapping macros here. jU&m*0nL  
// DO NOT EDIT what you see in these blocks of generated code! f#!+l1GV  
//}}AFX_MSG_MAP !{jw!bB  
END_MESSAGE_MAP() [Y](Y3/.N  
MV"n{1B  
CHookApp::CHookApp() d%8n   
{ %b^4XTz  
 // TODO: add construction code here, wSjDa.?'  
 // Place all significant initialization in InitInstance 44ty,M3  
} _X4Y1zh  
Z`tmuu  
CHookApp theApp; 1jg* DQ7L  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) {6ZSf[Y6B  
{ fY00  
 BOOL bProcessed=FALSE; Km(i}:6"  
 if(HC_ACTION==nCode) d{7ZO#E  
 { "] V\Y!  
  if((lParam&0xc0000000)==0xc0000000){// Key up {cs>Sy 4  
   switch(wParam) M~2Us{ `  
   { kg^0%-F  
    case VK_MENU: S.!,qv z  
     MaskBits&=~ALTBIT; .2E/(VM  
     break; 0zH-g  
    case VK_CONTROL: s>J5.Z7"'j  
     MaskBits&=~CTRLBIT; -MTk9<qnT  
     break; F$a s#.7FF  
    case VK_SHIFT: C.S BJ  
     MaskBits&=~SHIFTBIT; MI `qzC*%  
     break; zIrOMh  
    default: //judge the key and send message nc;e NB  
     break; C1D:Xi-  
   } |jiIx5qr  
   for(int index=0;index<MAX_KEY;index++){  rexf#W)  
    if(hCallWnd[index]==NULL) _Xd"'cXw  
     continue; (.:*GUg  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) A]|w1nq  
    { ircF3P>a?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); a}%f +`z  
     bProcessed=TRUE; Z<.&fZ^jS  
    } \\dUp>1=  
   } `7=$I~`  
  } R 0RxcB tG  
  else if((lParam&0xc000ffff)==1){ //Key down ]<^2B?}  
   switch(wParam) <r#FI8P;X  
   { hBX*02p   
    case VK_MENU: M3jUnp&  
     MaskBits|=ALTBIT; Q6HJ+H-Ub  
     break; ^K<3_D>1>  
    case VK_CONTROL: "/zgh  
     MaskBits|=CTRLBIT; b{<?E };%  
     break; qYA~Os1e  
    case VK_SHIFT: ZHNL ~=r}  
     MaskBits|=SHIFTBIT; |P>7C  
     break; , MXU]{  
    default: //judge the key and send message T<B}Z11R  
     break; 4QA~@pBX^{  
   } !_ W/p`Tc  
   for(int index=0;index<MAX_KEY;index++) s/7Z.\  
   { =%m{|HQ`  
    if(hCallWnd[index]==NULL) J#$U<`j*G  
     continue; ^bv^&V&IB  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) q-`&C  
    { O t)}:oG  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); &4:R(]|  
     bProcessed=TRUE; =cEsv&i  
    } 3mHzOs\jU  
   } lOt7 ij(,L  
  } }nlS&gew^  
  if(!bProcessed){ J%CCUl2  
   for(int index=0;index<MAX_KEY;index++){ g!XC5*}  
    if(hCallWnd[index]==NULL) lKsn6c,]  
     continue; =@!t/LR7kg  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 5_;-Qw  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); kO\ O$J^S  
   } 1Vu#:6%  
  } "Pwa}{  
 } 5GM-*Ak@  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); wyy 1M+  
} K83'`W^  
HV~Fe!J_  
BOOL InitHotkey() 9O 'j+?(`@  
{  >:-e  
 if(hHook!=NULL){ [#Qf#T%5h  
  nHookCount++; ;U=b 6xE  
  return TRUE; o-rX4=T  
 } bG]0|  
 else 1d< b\P0  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ?y? 9;;  
  if(hHook!=NULL) I!L J&>  
   nHookCount++; ["D!IqI :  
  return (hHook!=NULL); /9pxEidVAS  
} v.|#^A?Qx  
BOOL UnInit() 8%K{lg"  
{ n[Q(q[ULV  
 if(nHookCount>1){ r-y;"h'  
  nHookCount--; /wLBmh1"  
  return TRUE; x@OBGKV  
 } %D4)Bqr  
 BOOL unhooked = UnhookWindowsHookEx(hHook); dL$ iTSfz"  
 if(unhooked==TRUE){ ;z4J)qw  
  nHookCount=0; i%FC lMF  
  hHook=NULL; MDF_Xr-hZ  
 } h[>pC"s?K  
 return unhooked; KA?}o^-F  
} 86{>X5+  
"K(cDVQ  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) pWxk^qhe/  
{ 0#WN2f, <:  
 BOOL bAdded=FALSE; ?b+Y])SJK  
 for(int index=0;index<MAX_KEY;index++){ ~P'.R.e  
  if(hCallWnd[index]==0){ y^C5_w(^jZ  
   hCallWnd[index]=hWnd; h^ Cm\V  
   HotKey[index]=cKey; {IgH0+z  
   HotKeyMask[index]=cMask; fQ5v?(  
   bAdded=TRUE; rn|]-^ku/  
   KeyCount++; ?>B?*IK!  
   break; t"4* ]S  
  } p3Ux%/ZqPV  
 } O.+J%],  
 return bAdded; ZPH_s^  
} 2p&$bf t  
@*y4uI6&  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Z{B  e  
{ W4o8]&A  
 BOOL bRemoved=FALSE; r.e K;  
 for(int index=0;index<MAX_KEY;index++){ dcY(1p)  
  if(hCallWnd[index]==hWnd){ D\THe-Vtr  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ H0s*Lb  
    hCallWnd[index]=NULL; %'1iT!g8  
    HotKey[index]=0; KVOV<uDCj  
    HotKeyMask[index]=0; m#UQ,EM  
    bRemoved=TRUE; Pdf-2 Tx  
    KeyCount--; ~LuGfPO^  
    break; 6=/sEzS'  
   } J3mLjYy  
  } J]U_A/f  
 } <mFDC?j  
 return bRemoved; m+!.H\  
} HF FG4'  
DT`HS/~fH  
void VerifyWindow() ;}SGJ7  
{ Ye3o}G9z  
 for(int i=0;i<MAX_KEY;i++){ q? ">  
  if(hCallWnd!=NULL){ bh@CtnO  
   if(!IsWindow(hCallWnd)){ 9I/l+IS"X  
    hCallWnd=NULL; PRU&y/zZmG  
    HotKey=0; -W9DH^EL<  
    HotKeyMask=0; Nud =K'P=  
    KeyCount--; 1\fx57a\  
   } )YAa7\Od  
  } vcFR Td  
 } 'd~(=6J  
} VZt%cq  
Wo "s;Z  
BOOL CHookApp::InitInstance() e8<}{N0,n  
{ CK[8y&  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); [P+kQBL pL  
 hins=AfxGetInstanceHandle(); P4#i]7%  
 InitHotkey(); 3Rb#!tx9  
 return CWinApp::InitInstance(); 4MPy}yT*  
} ^y@ W\  
 $U?]^  
int CHookApp::ExitInstance() svmb~n&x6  
{ b#?sx"z  
 VerifyWindow(); SEM?vQ 0"}  
 UnInit(); HTYyX(ya  
 return CWinApp::ExitInstance(); h,$CJdDY]  
} %e]G]B%  
7dY_b  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 6B8!}6Ojc  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) .T3N"}7[  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ )vO"S  
#if _MSC_VER > 1000 5@xR`g-  
#pragma once oT\K P  
#endif // _MSC_VER > 1000 Ga 5s9wC  
cjL)M=pIS  
class CCaptureDlg : public CDialog a_c(7bQ  
{ pL,XHR@Iv  
 // Construction u9 &$`N_G  
 public: t}k:wzZ@  
  BOOL bTray; b@CjnAZ  
  BOOL bRegistered; f,yl'2{  
  BOOL RegisterHotkey(); dE"_gwtX  
  UCHAR cKey; uaO.7QSwN  
  UCHAR cMask; w8X5kk   
  void DeleteIcon(); J>v[5FX+  
  void AddIcon(); Md~SzrU  
  UINT nCount; Z|C,HF+m.  
  void SaveBmp(); )>1}I_1j)  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor +UDt2  
  // Dialog Data %"v:x?d$$o  
  //{{AFX_DATA(CCaptureDlg) Gl>\p  
  enum { IDD = IDD_CAPTURE_DIALOG }; D`@a*YIq  
  CComboBox m_Key; wKpBH}  
  BOOL m_bControl; Q$ew.h  
  BOOL m_bAlt; ,^G+<T6  
  BOOL m_bShift; rhkKK_  
  CString m_Path; |Lg2;P7\  
  CString m_Number; &lLk[/b  
  //}}AFX_DATA ,;t:x|{%  
  // ClassWizard generated virtual function overrides _]*YSeh=  
  //{{AFX_VIRTUAL(CCaptureDlg) JxinfWk  
 public: B}TY+@  
  virtual BOOL PreTranslateMessage(MSG* pMsg); i6HRG\9nU  
 protected: ~qqxHymc  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support <<LLEdB  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); bRu 9*4t  
  //}}AFX_VIRTUAL kqKT>xo4EZ  
  // Implementation 5)< Y3nU~  
 protected: 48 wt  
  HICON m_hIcon; W7n^]~V  
  // Generated message map functions ta{24{?M\  
  //{{AFX_MSG(CCaptureDlg) eOb--@~8  
  virtual BOOL OnInitDialog(); rY(7IX  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ~T;:Tg*  
  afx_msg void OnPaint(); KD A8x W  
  afx_msg HCURSOR OnQueryDragIcon(); M ]047W  
  virtual void OnCancel(); `F/R:!v  
  afx_msg void OnAbout(); E "=4(   
  afx_msg void OnBrowse();  +#,J`fV%  
  afx_msg void OnChange(); Z5TA4Q+Q  
 //}}AFX_MSG Rf0so   
 DECLARE_MESSAGE_MAP() we _CF*zj  
}; ]AA|BeL?|  
#endif !AXLoq$SY  
>0@w"aKn  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ;)h?P.]  
#include "stdafx.h" :!s7B|_U  
#include "Capture.h" s/hgWW$  
#include "CaptureDlg.h" {v0r'+`  
#include <windowsx.h> ]D;*2Lw4&  
#pragma comment(lib,"hook.lib") d(|?gN^  
#ifdef _DEBUG h rSH)LbJ  
#define new DEBUG_NEW J\@g3oGw  
#undef THIS_FILE /x@aAJ|  
static char THIS_FILE[] = __FILE__; SWw!s&lP&  
#endif J.JD8o9sa  
#define IDM_SHELL WM_USER+1 'a0M.*f}G  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ,iYhD-"'  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); >rlUV"8jY;  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ynw(wSH=  
class CAboutDlg : public CDialog xY]q[a?cy  
{ 9^DAlY,x.  
 public: w>*Jgc@A*  
  CAboutDlg(); YT?Lt!cl=  
  // Dialog Data g^ ?G)>  
  //{{AFX_DATA(CAboutDlg) atpHv**D<i  
  enum { IDD = IDD_ABOUTBOX }; wL~A L  
  //}}AFX_DATA oF$#7#0`;8  
  // ClassWizard generated virtual function overrides jywS<9c@  
  //{{AFX_VIRTUAL(CAboutDlg) 3!F^ vZ.  
 protected: }IWt\a<d  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Yr{hJGw[  
  //}}AFX_VIRTUAL E+i(p+=4  
  // Implementation 8SRUqe[H]  
 protected: ^Lb\k|U ,\  
  //{{AFX_MSG(CAboutDlg) sDBSc:5+e  
  //}}AFX_MSG eV!(a8  
  DECLARE_MESSAGE_MAP() MH)V=xU|)  
}; .'o=J`|  
Eb~vNdPo  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Ag2~q  
{ *bo| F%NAz  
 //{{AFX_DATA_INIT(CAboutDlg) kttJTP77t  
 //}}AFX_DATA_INIT {Y5@SI yE  
} B`)sc ~u  
uxn+.fA  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) mC@v,"  
{ H0&wn#);6R  
 CDialog::DoDataExchange(pDX); *~GI-h  
 //{{AFX_DATA_MAP(CAboutDlg) =c \(]xX  
 //}}AFX_DATA_MAP f|(9+~K/7&  
} Il4]1d|  
MOh&1]2j5  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 9b >+ehjB  
 //{{AFX_MSG_MAP(CAboutDlg) iLv -*%%  
 // No message handlers 3r#['UmT  
 //}}AFX_MSG_MAP W*s=No3C  
END_MESSAGE_MAP() P !f{U;B  
?,7!kTRH  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Es#:0KH].v  
: CDialog(CCaptureDlg::IDD, pParent) '^m'r+B"  
{  Ps.xY;Y  
 //{{AFX_DATA_INIT(CCaptureDlg) G^ k8Or2  
  m_bControl = FALSE; oJNQdW[  
  m_bAlt = FALSE; Ns YEBT7f  
  m_bShift = FALSE; { Zv%DV4_$  
  m_Path = _T("c:\\"); <D:q4t  
  m_Number = _T("0 picture captured."); !X: TieyVu  
  nCount=0; Sr Nc  
  bRegistered=FALSE; yCR8c,'8  
  bTray=FALSE; VDOC>  
 //}}AFX_DATA_INIT Cxq |N]E  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 tvf.K+  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); wz3X;1l`c  
} Jc?zX8>Ae:  
3mofp`e  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) nygGI_[l  
{ HD#>K 7  
 CDialog::DoDataExchange(pDX); ;39a`  
 //{{AFX_DATA_MAP(CCaptureDlg) zd2_k 9  
  DDX_Control(pDX, IDC_KEY, m_Key); 0kCo0{+n  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); c;/vzIJj  
  DDX_Check(pDX, IDC_ALT, m_bAlt); VF11eZ"  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 4Ia'Yr  
  DDX_Text(pDX, IDC_PATH, m_Path); ,<+:xl   
  DDX_Text(pDX, IDC_NUMBER, m_Number); } l+_KA  
 //}}AFX_DATA_MAP |LJv*  
} @TW:6v`  
v&G9HiH  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) clyp0`,7  
//{{AFX_MSG_MAP(CCaptureDlg) ,7cw%mQA  
 ON_WM_SYSCOMMAND() Zs t)S(  
 ON_WM_PAINT() l'[;q '  
 ON_WM_QUERYDRAGICON() * G*VY#L  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) >QJDO ]~V  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) H0tu3Pqk  
 ON_BN_CLICKED(ID_CHANGE, OnChange) a ub$4n!C9  
//}}AFX_MSG_MAP 1P*GIt2L  
END_MESSAGE_MAP() &+02Sn3A  
=Bc{0p*  
BOOL CCaptureDlg::OnInitDialog() LiFR7\z  
{ ea @ H  
 CDialog::OnInitDialog(); 7;@YR  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); tk -)N+M.  
 ASSERT(IDM_ABOUTBOX < 0xF000); GIYdI#0RC  
 CMenu* pSysMenu = GetSystemMenu(FALSE); !wE% <Fh  
 if (pSysMenu != NULL) >pZ _  
 { "LDNkw'  
  CString strAboutMenu; Mu:zWLM*M  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ?r(vXq\  
  if (!strAboutMenu.IsEmpty()) &S*{a  
  { |O)ZjLx  
   pSysMenu->AppendMenu(MF_SEPARATOR); B>'J5bZsw  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); mpD.x5jm<  
  } e`][zx  
 } Ff0V6j)ji  
 SetIcon(m_hIcon, TRUE); // Set big icon ([a;id  
 SetIcon(m_hIcon, FALSE); // Set small icon U~sC%Ri-@U  
 m_Key.SetCurSel(0); q("l?'  
 RegisterHotkey(); Am3j:|>*  
 CMenu* pMenu=GetSystemMenu(FALSE); rZ.=Lq  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); g,*fpk  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); )CoFRqz<h  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); um]N]cCD`  
 return TRUE; // return TRUE unless you set the focus to a control nTsV>lQY,  
} WxD$k3U  
[7x;H  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 'bZw-t!M@  
{ (W"0c?i|]  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) `_/1zL[  
 { H/[(T%]o  
  CAboutDlg dlgAbout; OAo03KW  
  dlgAbout.DoModal();  n}b/9  
 } \Qv:7;?  
 else Vm@VhCsp  
 { X`v6gv5qj  
  CDialog::OnSysCommand(nID, lParam); (/&ht-~EL  
 } Q ijO%)  
} Qu<HeSA_  
t3}_mJ  
void CCaptureDlg::OnPaint() #,lbM%a  
{ \QSD*  
 if (IsIconic()) ~ cu+QR)  
 { ( Ygy%O%  
  CPaintDC dc(this); // device context for painting *3RD\.jPX  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); liB~vdqj  
  // Center icon in client rectangle ^cW{%R>XY  
  int cxIcon = GetSystemMetrics(SM_CXICON); =$~x]  
  int cyIcon = GetSystemMetrics(SM_CYICON); b)XGr?  
  CRect rect; |1!|SarM{B  
  GetClientRect(&rect); c\P}Z Q  
  int x = (rect.Width() - cxIcon + 1) / 2; *2pE39  
  int y = (rect.Height() - cyIcon + 1) / 2; 4;H m%20g  
  // Draw the icon Y8s-cc(  
  dc.DrawIcon(x, y, m_hIcon); @:'E9J06  
 } 26_PFHQu4  
 else ;$!0pxL)s  
 { PMQ31f/zf  
  CDialog::OnPaint(); c}=[r1M*  
 } &,XPMT  
} zYPvpZV/  
_6nza)OFH  
HCURSOR CCaptureDlg::OnQueryDragIcon() @$QtY(a  
{ hI<$lEB  
 return (HCURSOR) m_hIcon; YE"MtL {  
} c7?|Tipc  
RvVF^~u  
void CCaptureDlg::OnCancel() @ *T8>  
{ 3e;K5qSeo/  
 if(bTray) xU.Ymq& 5  
  DeleteIcon(); aeLIs SEx  
  CDialog::OnCancel(); v"sU87+  
} MS|1Q@S9  
;''S} ;  
void CCaptureDlg::OnAbout() \FO 4A  
{ odcrP\S  
 CAboutDlg dlg; jP3~O  
 dlg.DoModal(); ER]C;DYX  
} .d)H2X  
wE <PXBl\b  
void CCaptureDlg::OnBrowse() M@.?l=1X  
{ :e_yOT}}  
 CString str; T5-'|+  
 BROWSEINFO bi; |>I4(''}  
 char name[MAX_PATH]; kP~ ;dJD  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 9fSX=PVRmQ  
 bi.hwndOwner=GetSafeHwnd(); uTrGb:^  
 bi.pszDisplayName=name; Tkf4`Gxd  
 bi.lpszTitle="Select folder"; %%O_:@9x,  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; c$hoqi |tD  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); y3V47J2o  
 if(idl==NULL) c%n%,R>  
  return; #0qMYe>Y  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); exm*p/  
 str.ReleaseBuffer(); R&R{I/;i*.  
 m_Path=str; g'eJN  
 if(str.GetAt(str.GetLength()-1)!='\\') 4~:D7",Jn  
  m_Path+="\\"; s.}:!fBk  
 UpdateData(FALSE); {-5 b[m(  
} Zf\It<zT5  
a)L=+Z  
void CCaptureDlg::SaveBmp() f7]C1!]  
{ f%d =X>_  
 CDC dc; 2-wvL&pi)  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); l]e7  
 CBitmap bm; GZFLJu  
 int Width=GetSystemMetrics(SM_CXSCREEN); na4^RPtN\e  
 int Height=GetSystemMetrics(SM_CYSCREEN); Y2p~chx9  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 5th\_n}N2/  
 CDC tdc; F>3fP  
 tdc.CreateCompatibleDC(&dc); kObgoMT<[  
 CBitmap*pOld=tdc.SelectObject(&bm); p@xK`=Urb  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Tq.%_/@M<  
 tdc.SelectObject(pOld); \?.M1a[  
 BITMAP btm; Uefw  
 bm.GetBitmap(&btm); obIYC  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; h@ ?BA<'S  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); RE:$c!E!  
 BITMAPINFOHEADER bih; Riz!HtyR  
 bih.biBitCount=btm.bmBitsPixel; &4l >_  
 bih.biClrImportant=0; 9=^4p=1J  
 bih.biClrUsed=0; .l&<-l;UQ  
 bih.biCompression=0; </d&bS  
 bih.biHeight=btm.bmHeight; D8_-Dvp7H  
 bih.biPlanes=1; [W,maT M"  
 bih.biSize=sizeof(BITMAPINFOHEADER); +4p gPv  
 bih.biSizeImage=size; Vt," 5c  
 bih.biWidth=btm.bmWidth; I:#Es.  
 bih.biXPelsPerMeter=0; O/Wc@Ln  
 bih.biYPelsPerMeter=0; $y*[" ~TJ  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 5/{gY{  
 static int filecount=0; = l9H]`T/  
 CString name; =}AwA5G  
 name.Format("pict%04d.bmp",filecount++); A|U_$!cLZ  
 name=m_Path+name; D3%`vq u&  
 BITMAPFILEHEADER bfh; vo DTU]pf  
 bfh.bfReserved1=bfh.bfReserved2=0; jG3i )ALx  
 bfh.bfType=((WORD)('M'<< 8)|'B'); r*l:F{  
 bfh.bfSize=54+size; Aa/lKiiz  
 bfh.bfOffBits=54; lN^} qg><  
 CFile bf; ! =c&U.B  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ {utIaMb]&v  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); nK9A=H'Hc  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); X[c8P7  
  bf.WriteHuge(lpData,size);  %sLij*  
  bf.Close(); o93A:fc  
  nCount++; _7zER6#}  
 } 4 p(KdYc  
 GlobalFreePtr(lpData); OW<5,h  
 if(nCount==1) d<v>C-nk%  
  m_Number.Format("%d picture captured.",nCount); ]jS+ItL@  
 else k/#& ]8(  
  m_Number.Format("%d pictures captured.",nCount); =w!14@W  
  UpdateData(FALSE); BqKh&m  
} sf5koe  
az]S&\i7T  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ='cr@[~i  
{ 4RqOg1  
 if(pMsg -> message == WM_KEYDOWN) ;0VE *  
 { UujFZg[-P9  
  if(pMsg -> wParam == VK_ESCAPE) NN W*  
   return TRUE; &H{KXX"X  
  if(pMsg -> wParam == VK_RETURN) Q4MTedj1H  
   return TRUE; uNYHEs6%T$  
 } )xQA+$H#4  
 return CDialog::PreTranslateMessage(pMsg); }0Q6iHX@  
} 0:(@Y  
ukSi9| 1-,  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) rX#} 2  
{ 5sq#bvfJ o  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ LPk85E  
  SaveBmp(); @`ttyI^1f  
  return FALSE; * 5#Y [c  
} ZIx,?E+eJ  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ _6 ~/`_(KP  
 CMenu pop; vxo iPqo  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); /*lSpsBn  
 CMenu*pMenu=pop.GetSubMenu(0); &6E^<v?]  
 pMenu->SetDefaultItem(ID_EXITICON); Gu:aSb  
 CPoint pt; "rr,P0lgX  
 GetCursorPos(&pt); |!)3[<.  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); g9;}?h  
 if(id==ID_EXITICON) }_L@CpG  
  DeleteIcon(); *r+i=i8{  
 else if(id==ID_EXIT) zKWcDbj  
  OnCancel(); |T9p#) ec2  
 return FALSE; (6G5UwSt  
} kN>AY'1  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); x=bAR%i~  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) dOe|uQXyD  
 AddIcon(); >w?O?&Q$  
 return res; QO)Q%K,  
} 16YJQ ue  
Ov)rsi  
void CCaptureDlg::AddIcon() A|Yq Bl  
{ vF;%#P  
 NOTIFYICONDATA data; 4y+] V~p  
 data.cbSize=sizeof(NOTIFYICONDATA); 7@m  
 CString tip; M>~jLu0@  
 tip.LoadString(IDS_ICONTIP); 13Ee"r  
 data.hIcon=GetIcon(0); lV^sVN Z]  
 data.hWnd=GetSafeHwnd(); xgtdmv%  
 strcpy(data.szTip,tip); 8_ns^6XK5p  
 data.uCallbackMessage=IDM_SHELL; 52>?l C  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; kG+CT  
 data.uID=98; c|Nv^V*2  
 Shell_NotifyIcon(NIM_ADD,&data); Au" [2cG  
 ShowWindow(SW_HIDE); x 1$tS#lS  
 bTray=TRUE; mD)_quz.sk  
} oZ@_o3VG  
Ajhrsa\~a  
void CCaptureDlg::DeleteIcon() gBq,So  
{ 8lt P)K4  
 NOTIFYICONDATA data; 2|#3rF  
 data.cbSize=sizeof(NOTIFYICONDATA); ue$\ i=jw  
 data.hWnd=GetSafeHwnd(); pscCXk(|A`  
 data.uID=98; 0%+TU4Xx  
 Shell_NotifyIcon(NIM_DELETE,&data); G;MgrA#\  
 ShowWindow(SW_SHOW); Sg0 _l(  
 SetForegroundWindow(); hsljJvs  
 ShowWindow(SW_SHOWNORMAL); }$;T.[ ~  
 bTray=FALSE; l9q ygh  
} \sF}NBNT@  
v. ,C"^W  
void CCaptureDlg::OnChange() {JzX`Z30l  
{ 8Hs>+Udl  
 RegisterHotkey(); Y'Jb@l`$-  
} ^^%sPtp  
lvb0dOmY  
BOOL CCaptureDlg::RegisterHotkey() V D.p"F(]  
{ !w98 [BE7  
 UpdateData(); +tOBt("5/  
 UCHAR mask=0; >GgX-SZ%  
 UCHAR key=0; r 06}@7  
 if(m_bControl) X1i6CEa<  
  mask|=4; :*6tbUp  
 if(m_bAlt) 6A/Nlk.  
  mask|=2; Zcz)FP#  
 if(m_bShift) xZL`<3?  
  mask|=1; 7Z"mVh}  
  key=Key_Table[m_Key.GetCurSel()]; Lqbu]  
 if(bRegistered){ W9Bl'e  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); oyJ/Oe {  
  bRegistered=FALSE; <<w $ Ur  
 } t[F tIj6  
 cMask=mask; GOa](oD}  
 cKey=key; ~c :e0}  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); F)Yn1&a#H  
 return bRegistered; xK0VWi  
} OHqLMBW!!  
FcsEv {#U  
  四、小结 Ab-S*| B  
* "ER8\  
  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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