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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: c.<bz  
  K!L0|W H%!  
  一、实现方法 ^lI>&I&1  
X,ES=J0  
  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: rw9m+q  
bu}N{cW  
#pragma data_seg("shareddata") h(<2{%j  
HHOOK hHook =NULL; //钩子句柄 xcVF0%wVC  
UINT nHookCount =0; //挂接的程序数目 )BJ Z{E*  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 X:0-FCT;\  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 +*'^T)sj/  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey \& KfIh8  
static int KeyCount =0; li4"|T&  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 1@$n )r`  
#pragma data_seg() +dw=)A#/  
2^V/>|W>w  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 _J N$zZ{  
B&bQvdp  
  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;+bHrKji  
|qp^4vq.p  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR v` G[6Z  
cKey,UCHAR cMask) ees^j4  
{ wjRv =[  
 BOOL bAdded=FALSE; T@{ }!  
 for(int index=0;index<MAX_KEY;index++){ y)Y0SY1\j  
  if(hCallWnd[index]==0){ 'yIz<o  
   hCallWnd[index]=hWnd; 8<2 [ F  
   HotKey[index]=cKey; `A\|qH5`W  
   HotKeyMask[index]=cMask; h#e((j3-2Z  
   bAdded=TRUE; (^U 8wit/  
   KeyCount++; \DgWp:|  
   break; :!cNkJa  
  } `~+1i5-}  
 } Z7$"0%  
 return bAdded; [k<w'n*  
} UtpK"U$XOU  
//删除热键 R9-Ps qmF  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ]:K[{3iM  
{ v 7g?  
 BOOL bRemoved=FALSE; x5Z(_hU  
 for(int index=0;index<MAX_KEY;index++){ s|q]11r+H  
  if(hCallWnd[index]==hWnd){ V1d{E 0lM  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ %F.^cd"  
    hCallWnd[index]=NULL; [VL+X^  
    HotKey[index]=0; ws_/F  
    HotKeyMask[index]=0; O{Y_j&1  
    bRemoved=TRUE; x&['g*[L0  
    KeyCount--; 2Nau]y]=  
    break; $+%eLx*  
   } r ?e''r  
  } !#b8QER  
 } =KCAHNr4?  
 return bRemoved; xO` `X<  
} K'DRX85F  
F?3zw4Vt~  
FL8?<bU  
  DLL中的钩子函数如下: ]K^#'[  
?T (@<T  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) N H$!<ffz  
{ 5@3hb]J  
 BOOL bProcessed=FALSE; ej^pFo  
 if(HC_ACTION==nCode) k2@|fe  
 { v;_k*y[VV$  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 >'MT]@vez  
   switch(wParam) )LRso>iOO  
   {  Y`tv"v2  
    case VK_MENU: k O8W>  
     MaskBits&=~ALTBIT; \c .^^8r  
     break; ;q ;}2  
    case VK_CONTROL: K7jz*|2  
     MaskBits&=~CTRLBIT; j 56Dt_  
     break; ` yXJaTbo  
    case VK_SHIFT: exfJm'R?n  
     MaskBits&=~SHIFTBIT; )r +o51gp  
     break; q'zV9  
    default: //judge the key and send message /bBFPrW  
     break; G*].g['  
   } ,|Xibfw  
   for(int index=0;index<MAX_KEY;index++){ { d*?O  
    if(hCallWnd[index]==NULL) sDF5  
     continue; ' Akt5q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ?_<14%r;  
    { !I UH 5  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); >AUj4d  
     bProcessed=TRUE; u@ psVt   
    } s${|A =  
   } Scfk] DT  
  } 6Y 4I $[  
  else if((lParam&0xc000ffff)==1){ //有键按下 k >aWI  
   switch(wParam) o$[alh;c+W  
   { D?Y j5eOa  
    case VK_MENU: A]WR-0Z7  
     MaskBits|=ALTBIT; ;H%T5$:trP  
     break; z~R:!O-  
    case VK_CONTROL: :Dn{  
     MaskBits|=CTRLBIT; Pd^v-}[  
     break; $SAk|  
    case VK_SHIFT: B?|url6h  
     MaskBits|=SHIFTBIT; ~ 6`Ha@  
     break; THXG~3J<  
    default: //judge the key and send message @4ECz>Q  
     break; !JOM+P:  
   } CdFr YL+F  
   for(int index=0;index<MAX_KEY;index++){ g~Hmka_fD1  
    if(hCallWnd[index]==NULL) sm1(I7y  
     continue; ^@a|s Sb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 2uajK ..b  
    { *H''.6  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); I"Gr<?r  
     bProcessed=TRUE; m@2;9  
    } bFt$u]Yvo  
   } y"o@?bny  
  } FJYc*l  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 *|F ;An.N^  
   for(int index=0;index<MAX_KEY;index++){ 5[\LQtM  
    if(hCallWnd[index]==NULL) Bl6>y/  
     continue; k#Bq8d  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) }c1?:8p  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); teDO,$  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 lgL|[ik`  
   } n\x@~ SzrX  
  } JF%_8Ye5  
 } M6mJ'Q482  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ZY Ci&l  
} W.O]f.h  
fkjo  
  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: FLE2]cL-  
8F#z)>q~  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); /GQN34RD  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ,%uK^U.zk  
= "N?v-  
  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: 61"w>;d6  
#;WKuRv   
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) U<"@@``+N  
{ mO1r~-~AJ  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) {;T7Kg.C  
 { '9R.$,N  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 +uD4$Wt_F  
  SaveBmp(); 4{Q{>S*h  
  return FALSE; ivb?B,Lz0  
 } =Co[pt  
 …… //其它处理及默认处理 q0a8=o"|  
} s;[OR  
0K *|B.O  
]@rt/ eX  
  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。 }+wvZq +c  
<RFT W}f!  
  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。 zZ11J0UI  
^zs]cFN#%  
  二、编程步骤 `Zm- F  
#@cOyxUt  
  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"; HL*Fs /W  
$afE= qC*  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; E/6@>.T?'  
q]qKU`m!Q`  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 4U1!SR]s  
`YinhO:Z  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; [IgB78_$  
#F~^m  
  5、 添加代码,编译运行程序。 ~g_]Sskf7  
&~SPDiu.t  
三、程序代码 !9/1_Bjv  
;*Z.|?3 MM  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL F6$QEiDu@  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) A3Lfh6O  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ jZ5 mpYUO  
#if _MSC_VER > 1000 8FmRD  
#pragma once AzmISm  
#endif // _MSC_VER > 1000 E7K(I ?  
#ifndef __AFXWIN_H__ NGYUZ\m  
#error include 'stdafx.h' before including this file for PCH M&/([ >Q  
#endif E Pgn2[z  
#include "resource.h" // main symbols !B#Lea  
class CHookApp : public CWinApp |~y>R#u8pm  
{ 9AGf4tuy  
 public: <:t D m  
  CHookApp(); e/{1u$  
  // Overrides !jIpgs5  
  // ClassWizard generated virtual function overrides S=R}#  
  //{{AFX_VIRTUAL(CHookApp) 2Y`C\u  
 public: OK6c"*<z  
  virtual BOOL InitInstance(); c2aW4 TX2  
  virtual int ExitInstance(); p903 *F^[,  
  //}}AFX_VIRTUAL e7cqm*Qi  
  //{{AFX_MSG(CHookApp) Gd]!D~[1  
  // NOTE - the ClassWizard will add and remove member functions here. +F9)+wT~;q  
  // DO NOT EDIT what you see in these blocks of generated code ! V:wx@9m)  
  //}}AFX_MSG 0bt"U=x4  
  DECLARE_MESSAGE_MAP() Y\sSW0ZX  
}; Z^ e?V7q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); %v_w"2x;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); !&ly :v!  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); JQp::,g  
BOOL InitHotkey(); ,vnHEY&  
BOOL UnInit(); <1L?Xhoc6  
#endif +frkC| .  
xMb)4cw}  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 64hl0'67y  
#include "stdafx.h" 9~En;e  
#include "hook.h" !}TZmwf'  
#include <windowsx.h> Y~j )B\^{  
#ifdef _DEBUG '^!1AGF  
#define new DEBUG_NEW zh<[ /'l  
#undef THIS_FILE eVVm"96Q.;  
static char THIS_FILE[] = __FILE__; ;ZSJ-r  
#endif 9MmAoLm  
#define MAX_KEY 100 *&m{)cTs  
#define CTRLBIT 0x04 w[A$bqz   
#define ALTBIT 0x02 `h:$3a:5  
#define SHIFTBIT 0x01 :JEzfI1  
#pragma data_seg("shareddata") k!^Au8Up?  
HHOOK hHook =NULL; BM@:=>ypQ  
UINT nHookCount =0; NFEF{|}BM  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey /tu+L6  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT $GR 3tLzK:  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ^F*G  
static int KeyCount =0; {}#W~1`  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift +] .Zs<  
#pragma data_seg() :+G1=TuXw~  
HINSTANCE hins; BfcpB)N&.K  
void VerifyWindow(); *A>I)a<:  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) QNk\y@yKw  
//{{AFX_MSG_MAP(CHookApp) 7LQLeQvB  
// NOTE - the ClassWizard will add and remove mapping macros here. &6yh4-(7  
// DO NOT EDIT what you see in these blocks of generated code! 3V,$FS]  
//}}AFX_MSG_MAP 4}4K6y<q  
END_MESSAGE_MAP() |@rPd=G^(/  
ep<O?7@j-G  
CHookApp::CHookApp() bm &$wf  
{ vp4l g1/  
 // TODO: add construction code here, [xTu29X.  
 // Place all significant initialization in InitInstance mihR *8p  
} +~E;x1&'  
p\7(`0?8VN  
CHookApp theApp; w=]bj0<A=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) D]{#!w(d  
{ Ed(6%kd  
 BOOL bProcessed=FALSE; Y\Z.E ;  
 if(HC_ACTION==nCode) W[dK{?RB  
 { y(#Aze{yC  
  if((lParam&0xc0000000)==0xc0000000){// Key up XJs*DK  
   switch(wParam) \5MW65  
   { @F+zME   
    case VK_MENU: 7u9]BhcFv?  
     MaskBits&=~ALTBIT; '`/Qr~]  
     break; Vm_waa  
    case VK_CONTROL: `<0{U]m  
     MaskBits&=~CTRLBIT; M[C9P.O%w  
     break; K!JXsdHK  
    case VK_SHIFT: .5i\L OTd  
     MaskBits&=~SHIFTBIT; 3XCePA5z  
     break; (zVT{!z  
    default: //judge the key and send message Ic%c%U=i  
     break; 2=&4@c|cn  
   } -*Voui  
   for(int index=0;index<MAX_KEY;index++){ SnK#YQCDt  
    if(hCallWnd[index]==NULL) C6$F.v  
     continue; aCq ) hR  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |6M:JI8  
    { <3[,bTIk  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Y [hTO.LF  
     bProcessed=TRUE; ?!h jI;_&  
    } ) r8yt}  
   } &vDK6w,  
  }  8>}k5Qu  
  else if((lParam&0xc000ffff)==1){ //Key down 'Mfn:n+  
   switch(wParam) EH*Lw c  
   { d3$*z)12`  
    case VK_MENU: _I"T(2Au  
     MaskBits|=ALTBIT; <6 LpsM}  
     break; Qx B0I/ {  
    case VK_CONTROL: |wnXBKV(  
     MaskBits|=CTRLBIT; f.Uvf^T}2  
     break; mHm"QBa!  
    case VK_SHIFT: q0Hor   
     MaskBits|=SHIFTBIT; O?6ph4'  
     break; 8"fZ>XQ  
    default: //judge the key and send message b6@(UneVM  
     break; Zj(2$9IU  
   } ~^&]8~m*d  
   for(int index=0;index<MAX_KEY;index++) jp~C''Sj  
   { ^7q qO%  
    if(hCallWnd[index]==NULL) #- l1(m  
     continue; @w8MOT$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) zlUXp0W  
    { n<}t\<LG^c  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Z{9 mZ lIy  
     bProcessed=TRUE; h!vq~g  
    } *8ZaG]L  
   } ,)S(SnCF  
  } Kx-s95t  
  if(!bProcessed){ E{Tvjh+  
   for(int index=0;index<MAX_KEY;index++){ _{eH" ,(  
    if(hCallWnd[index]==NULL) @v#]+9F  
     continue; nB; yS<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) j4!g&F _y  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); &!kD81?Mm  
   } u%o2BLx  
  } _a~uIGN  
 } &<oZl.T  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ([mC!d@a  
} 1>KZ1Kf  
h{J=Rq  
BOOL InitHotkey() 0u3"$o'R  
{ 0q@U>#  
 if(hHook!=NULL){ ^}F@*A;o  
  nHookCount++; c" |4'#S  
  return TRUE; 4Jf6uhaE  
 } 4iDlBs+  
 else .L#xX1qr  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); @@?P\jv~  
  if(hHook!=NULL) bv%A;  
   nHookCount++; *0*1.>Vg  
  return (hHook!=NULL); CDNh9`  
} STr&"9c  
BOOL UnInit() zKnHo:SV  
{ c{qoASc?  
 if(nHookCount>1){ L.%N   
  nHookCount--; $aY*1UVq  
  return TRUE; eJ=K*t|  
 } /^m3?q[a  
 BOOL unhooked = UnhookWindowsHookEx(hHook); _o'3v=5T  
 if(unhooked==TRUE){ [K*>W[n  
  nHookCount=0; q1|! oQ  
  hHook=NULL; X-Yy1"6m1  
 } l6[0i  
 return unhooked; b?=>)':f  
} ~h:/9q  
@(~ m.p|  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) eSC69mfD  
{ O%>FKU>(?  
 BOOL bAdded=FALSE; R*DQm  
 for(int index=0;index<MAX_KEY;index++){ 3U_,4qf  
  if(hCallWnd[index]==0){ B9Ha6kj  
   hCallWnd[index]=hWnd; *c 0\<BI  
   HotKey[index]=cKey; i uNBw]  
   HotKeyMask[index]=cMask; tn"n~;Bh?:  
   bAdded=TRUE; Hq>"rrVhx  
   KeyCount++; T|/B}srm  
   break; }Q=@$YIesD  
  } 0Rme}&$  
 } n#NE.ap$&,  
 return bAdded; ?HsQ417.H  
} ]]InD N  
.y)Y20=o!  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) XDot3)2`  
{ voD0 u  
 BOOL bRemoved=FALSE; >h[ {_+  
 for(int index=0;index<MAX_KEY;index++){ A#WvN>  
  if(hCallWnd[index]==hWnd){ SEL7,8 Hm  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ |?kZfr&9q  
    hCallWnd[index]=NULL; miq"3  
    HotKey[index]=0; W@T_-pTCjK  
    HotKeyMask[index]=0; ThvVLK  
    bRemoved=TRUE; e%B;8)7  
    KeyCount--; ~&UfnO  
    break; ZjOUk;H?  
   } `;:zZ8*  
  } jP{W|9@ (  
 } @S-p[u  
 return bRemoved; cP]5Qz   
} -f4>4@y  
t$*V*gK{  
void VerifyWindow() hPM:=@ N$  
{ ff1Em.  
 for(int i=0;i<MAX_KEY;i++){ T VuDK  
  if(hCallWnd!=NULL){ "%,KZI  
   if(!IsWindow(hCallWnd)){ K<3$>/|  
    hCallWnd=NULL; +RuPfw{z  
    HotKey=0; |, Lp1  
    HotKeyMask=0; a9w1Z4  
    KeyCount--; w<4,;FFlZ/  
   } Gx$rk<;ZW  
  } .t7mTpi  
 } !Q0aKkMfL  
} '(qVA>S  
,o_Ur.UJ  
BOOL CHookApp::InitInstance() Py3Y*YP  
{ 0VA$ Ige  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 4;_<CB  
 hins=AfxGetInstanceHandle(); o|FY-+  
 InitHotkey(); IhRYV`:  
 return CWinApp::InitInstance(); -%h0`hOG{  
} [xrM){ItW  
1\~-No  
int CHookApp::ExitInstance() E2 5:e EXa  
{ gLH#UwfJ  
 VerifyWindow(); M<s Y_<z  
 UnInit(); .2si[:_(p  
 return CWinApp::ExitInstance();  =Y0>b4  
} og! d  
(t{m(;/  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file dp&bcR&#)  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 4ZRE3^y\"  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ .&Vy o<9Ck  
#if _MSC_VER > 1000 Wb|xEwqd`  
#pragma once p{sbf;-x}  
#endif // _MSC_VER > 1000 mp\`9j+{  
hlgBx~S[  
class CCaptureDlg : public CDialog |PI]v`[  
{ z ]d^%>Ef  
 // Construction i l)LkZ@  
 public: .\W6XRw  
  BOOL bTray; `!K!+`Z9  
  BOOL bRegistered; X5M{No>z  
  BOOL RegisterHotkey(); v+3-o/G7  
  UCHAR cKey; LMV0:\>  
  UCHAR cMask; y'a(>s(  
  void DeleteIcon(); @t;WdbxB%  
  void AddIcon(); H"_]Hq  
  UINT nCount; B;ro(R  
  void SaveBmp(); K)h\X~s  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 5:=ECtKi  
  // Dialog Data sbZ^BFqp  
  //{{AFX_DATA(CCaptureDlg) x+L G4++  
  enum { IDD = IDD_CAPTURE_DIALOG }; 0%m}tfQ5  
  CComboBox m_Key; _QhB0/C  
  BOOL m_bControl; xEA%UFB.!G  
  BOOL m_bAlt; ]{[8$|Mg  
  BOOL m_bShift; X1P_IB  
  CString m_Path; (IrX \Y  
  CString m_Number; e>Z F? (a0  
  //}}AFX_DATA  h,D6MP  
  // ClassWizard generated virtual function overrides {O"?_6',  
  //{{AFX_VIRTUAL(CCaptureDlg) `wyX)6A|bt  
 public: /f:)I.FUm  
  virtual BOOL PreTranslateMessage(MSG* pMsg); [~ Wiy3n  
 protected: `F#<qZSR  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support g;>M{)A  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ${/"u3a_  
  //}}AFX_VIRTUAL T%Vg0Y)P;  
  // Implementation Od>^yhn  
 protected: WdA6Y  
  HICON m_hIcon; A ko}v"d  
  // Generated message map functions m-~eCFc  
  //{{AFX_MSG(CCaptureDlg) PR&D67:Jy  
  virtual BOOL OnInitDialog(); l<](8oc. w  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); R/yOy ^<  
  afx_msg void OnPaint(); t;R drk  
  afx_msg HCURSOR OnQueryDragIcon(); =uYz4IDB  
  virtual void OnCancel(); 'k9?n)<DW  
  afx_msg void OnAbout(); ~vCfMV[F  
  afx_msg void OnBrowse(); S[TJ{ L(  
  afx_msg void OnChange(); `f@VX :aL}  
 //}}AFX_MSG f[@M  
 DECLARE_MESSAGE_MAP() j'?^<4i  
}; +!(W>4F  
#endif `%2e?"OOJ  
rQncW~  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file !`BK%m\8  
#include "stdafx.h" ~N i#xa  
#include "Capture.h" K|H&x"t  
#include "CaptureDlg.h" ZU vA`   
#include <windowsx.h> xr2ew%&o  
#pragma comment(lib,"hook.lib") u% ^Lu.l_c  
#ifdef _DEBUG DIk\=[{2q  
#define new DEBUG_NEW NZ\aK}?~!  
#undef THIS_FILE 5X7kZ!r  
static char THIS_FILE[] = __FILE__; O1o.^i$-M  
#endif 8tc9H}>  
#define IDM_SHELL WM_USER+1 xLE+"6;W  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); U`j[Ni}"  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); cU y,q]PO  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 8e'0AI_>  
class CAboutDlg : public CDialog ZOFhX$I  
{ a.|4`*1[;  
 public: JlR'w]d M,  
  CAboutDlg(); b&$ ?.z  
  // Dialog Data =A6/D    
  //{{AFX_DATA(CAboutDlg) `0r=ND5.  
  enum { IDD = IDD_ABOUTBOX }; (1bz.N8z  
  //}}AFX_DATA `.# l_-U{  
  // ClassWizard generated virtual function overrides @G vDl=.  
  //{{AFX_VIRTUAL(CAboutDlg) G-U%  
 protected: pai>6p  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ." m6zq  
  //}}AFX_VIRTUAL u}QB-oU  
  // Implementation `ag7xd!  
 protected: $jYwV0  
  //{{AFX_MSG(CAboutDlg) ub "(,k P  
  //}}AFX_MSG s$Il;  
  DECLARE_MESSAGE_MAP() 3:$hC8  
}; !b O8apn  
JJnZbJti  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) #]s>  
{ Z=O2tR  
 //{{AFX_DATA_INIT(CAboutDlg) 7Q<uk[d0  
 //}}AFX_DATA_INIT Nxu 10  
} &gkGH<oaX  
*yuw8  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) K_V44f1f  
{ @jW_ r j:<  
 CDialog::DoDataExchange(pDX); e75 k-  
 //{{AFX_DATA_MAP(CAboutDlg) (89NK]2x  
 //}}AFX_DATA_MAP o7feH 6Sh  
} .+G),P)   
U*Z P>Vv  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) t)o #!)|  
 //{{AFX_MSG_MAP(CAboutDlg) ]fXMp*LvY  
 // No message handlers '3>kDH+  
 //}}AFX_MSG_MAP l`2X'sw[/  
END_MESSAGE_MAP() ]JX0:'x^  
s,TKC67.%+  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) o~ .[sn5l-  
: CDialog(CCaptureDlg::IDD, pParent) W{Cc wq  
{ Q dKxuG  
 //{{AFX_DATA_INIT(CCaptureDlg) k]<  
  m_bControl = FALSE; V1KWi ^  
  m_bAlt = FALSE; P'#m1ntxQ  
  m_bShift = FALSE; fGiN`j} j  
  m_Path = _T("c:\\"); K!?T7/@  
  m_Number = _T("0 picture captured."); $]CZ]EWts  
  nCount=0; Y&xmy|O#  
  bRegistered=FALSE; _=Y]ZX`j  
  bTray=FALSE; t"`LJE._P  
 //}}AFX_DATA_INIT h<.G^c)  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 6Q,-ZM=Z_p  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ND\&#  
} P>=~\v nN#  
j380=? 7  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Q p7|p  
{ cL&V2I5O  
 CDialog::DoDataExchange(pDX); Q5e ,[1  
 //{{AFX_DATA_MAP(CCaptureDlg) /"?y @;Y~  
  DDX_Control(pDX, IDC_KEY, m_Key); omM*h{z$$  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); buo_H@@p{s  
  DDX_Check(pDX, IDC_ALT, m_bAlt); yhe$A<Rl=  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); .~V0>r~my  
  DDX_Text(pDX, IDC_PATH, m_Path); :X[(ymWNE  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 8uoFV=bj\  
 //}}AFX_DATA_MAP b r)oSw  
} @v9 PI/c  
C #ng`7 q  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) S .rT5A[  
//{{AFX_MSG_MAP(CCaptureDlg) kZ+nL)YQ#  
 ON_WM_SYSCOMMAND() TX]4Y953D  
 ON_WM_PAINT() PY: l  
 ON_WM_QUERYDRAGICON() "U34D1I )#  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) }N5>^y  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ;C%40;Q  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 59";{"sw  
//}}AFX_MSG_MAP -zg,pK$+  
END_MESSAGE_MAP() CjM+%l0MW  
CGIcuHp  
BOOL CCaptureDlg::OnInitDialog() $]4^ENkI  
{ ll {jE  
 CDialog::OnInitDialog(); 22|eiW/a  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); vV1F|  
 ASSERT(IDM_ABOUTBOX < 0xF000); p5^,3&  
 CMenu* pSysMenu = GetSystemMenu(FALSE); h&J6  
 if (pSysMenu != NULL) ^_JD 7-g  
 { ;Jt*s  
  CString strAboutMenu; d$s1l  
  strAboutMenu.LoadString(IDS_ABOUTBOX); X 'Q$v~/  
  if (!strAboutMenu.IsEmpty()) Vb06z3"r  
  { T#^   
   pSysMenu->AppendMenu(MF_SEPARATOR); _3h(R`VdWO  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); cTm oz.0  
  } s;q]:+#7g  
 } xA]CtB*o7  
 SetIcon(m_hIcon, TRUE); // Set big icon |@={:gRJ{x  
 SetIcon(m_hIcon, FALSE); // Set small icon ,v:m  
 m_Key.SetCurSel(0); >`p`^:  
 RegisterHotkey(); m8H|cQ@Uu  
 CMenu* pMenu=GetSystemMenu(FALSE); S pDVD  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); V'~] b~R  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); F"j0;}+N  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); bp2l%A;  
 return TRUE; // return TRUE unless you set the focus to a control R-J\c+C>W  
} Nh~ Hh(   
VO>A+vx3M  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) +Y,>ftN  
{ d8Jy$,/`?  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) .pQH>;k]K  
 { ?:Y{c#w>  
  CAboutDlg dlgAbout; =?T\zLN=  
  dlgAbout.DoModal(); zJ7vAL  
 } `@ULG>   
 else "aK3 ylz;  
 { DDn@M|*$  
  CDialog::OnSysCommand(nID, lParam); j$^3  
 } K+xiov-r?  
} a ^<W ?Z  
Gvv~P3Dm  
void CCaptureDlg::OnPaint() i4 KW  
{ p>=YPi/d  
 if (IsIconic()) |\2z w _o  
 { /ZZo`   
  CPaintDC dc(this); // device context for painting !7@IWz(, "  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); :Ts"f*  
  // Center icon in client rectangle ( =0W[@k  
  int cxIcon = GetSystemMetrics(SM_CXICON); 2}>jq8Y47  
  int cyIcon = GetSystemMetrics(SM_CYICON);  ^ruS  
  CRect rect; QIF|pZ+^  
  GetClientRect(&rect); ;oV dkp  
  int x = (rect.Width() - cxIcon + 1) / 2; ,rc5r3  
  int y = (rect.Height() - cyIcon + 1) / 2; y.2_5&e/  
  // Draw the icon  db^S@}  
  dc.DrawIcon(x, y, m_hIcon); DCM ,|FE  
 } @Z~lM5n$8  
 else BKfcK>%g  
 { ?1i>b->  
  CDialog::OnPaint(); !Sfy'v.  
 } R!;tF|]  
} 8s pGDg\g  
CL|t!+wU/  
HCURSOR CCaptureDlg::OnQueryDragIcon() _KC)f'Cx  
{ Oga0CR_  
 return (HCURSOR) m_hIcon; ]p:x,%nm  
} 6+BR5Nr  
Q.#@xaX'{`  
void CCaptureDlg::OnCancel() Q+)fI  
{ rA&|!1q"B  
 if(bTray) *:bNK5I.t  
  DeleteIcon();  y$7Fq'  
  CDialog::OnCancel(); /8@JWK^I{  
} X0J@c "%0  
a \B<(R.  
void CCaptureDlg::OnAbout() e~=fo#*2?@  
{ q.FgX  
 CAboutDlg dlg; <splLZW3k  
 dlg.DoModal(); NqvL,~1G  
} H7?C>+ay  
RVy8%[Gcq  
void CCaptureDlg::OnBrowse() bwUsE U 0  
{ +Sv`23G@  
 CString str; P!:Y<p{=>  
 BROWSEINFO bi; `%p}.X  
 char name[MAX_PATH]; _H>ABo  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); L B1 ui  
 bi.hwndOwner=GetSafeHwnd(); #K'3` dpL  
 bi.pszDisplayName=name; c 6@!?8J  
 bi.lpszTitle="Select folder"; Fh9`8  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; R<lj$_72Q  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); qCOv4b`  
 if(idl==NULL) >/nS<y>  
  return; VS@o_fUx)  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); r<cyxR~  
 str.ReleaseBuffer(); Lw\ANku  
 m_Path=str; "12.Bi.O"[  
 if(str.GetAt(str.GetLength()-1)!='\\') @4Z>;  
  m_Path+="\\"; Q7UFF  
 UpdateData(FALSE); ,,S5 8\x  
} 'W usEME  
yZ)GP!cM4c  
void CCaptureDlg::SaveBmp() `YAqR?Xj_<  
{ %50}oD@  
 CDC dc; P}N%**>`  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); a{^[<  
 CBitmap bm; > n Y<J  
 int Width=GetSystemMetrics(SM_CXSCREEN); 9"1 0:\U  
 int Height=GetSystemMetrics(SM_CYSCREEN); _ $PZID  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ,n TC7V  
 CDC tdc; 'm}K$h(U  
 tdc.CreateCompatibleDC(&dc); ZW}*]rg  
 CBitmap*pOld=tdc.SelectObject(&bm); Mz# &"WjF  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); |lOxRUf~  
 tdc.SelectObject(pOld); g* F?  
 BITMAP btm; U(]a(k<r  
 bm.GetBitmap(&btm); ))cL+ r  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; I0P)DR  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); bPEf2Z G4  
 BITMAPINFOHEADER bih; ;X-~C.7k  
 bih.biBitCount=btm.bmBitsPixel; 6|wi Zw  
 bih.biClrImportant=0; /cF 6{0XS9  
 bih.biClrUsed=0; {ER! 0w/  
 bih.biCompression=0; S Y>i@s+ML  
 bih.biHeight=btm.bmHeight; 4]A2Jl E  
 bih.biPlanes=1; |8PUmax  
 bih.biSize=sizeof(BITMAPINFOHEADER); `Gzukh  
 bih.biSizeImage=size; ))|Wm}  
 bih.biWidth=btm.bmWidth; =:n>yZ3T  
 bih.biXPelsPerMeter=0; z:-a7_   
 bih.biYPelsPerMeter=0; vt<r_&+ pJ  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); W,5A|Q~  
 static int filecount=0; U(3+*'8r,1  
 CString name; /+pbO-rW*  
 name.Format("pict%04d.bmp",filecount++); I>o+INb:  
 name=m_Path+name; )9MmL-7K  
 BITMAPFILEHEADER bfh; T^g2N`w2  
 bfh.bfReserved1=bfh.bfReserved2=0; Rnt&<|8G  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 6js94ko[  
 bfh.bfSize=54+size; 8o#*0d|  
 bfh.bfOffBits=54; QCQku\GLV  
 CFile bf; IlG)=?8XZ  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Wz}RJC7p  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); _*h,,Q  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); w'z ?1M(*  
  bf.WriteHuge(lpData,size); #y%bx<A  
  bf.Close(); Q( .d!CQ>  
  nCount++; J * $u  
 } CdgZq\  
 GlobalFreePtr(lpData); 1OK,r`   
 if(nCount==1) <DP_`[+C  
  m_Number.Format("%d picture captured.",nCount); dqO!p6  
 else _"_ W KlN  
  m_Number.Format("%d pictures captured.",nCount); ~Z!!wDHS  
  UpdateData(FALSE); }UJS*mR  
} p0~=   
9YRoWb{y  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) CwZ+P n0  
{ 2%U)y;$m2  
 if(pMsg -> message == WM_KEYDOWN) (M5w:qbR  
 { $7eO33Bm  
  if(pMsg -> wParam == VK_ESCAPE) i71 ,  
   return TRUE;  hX?L/yf  
  if(pMsg -> wParam == VK_RETURN) !cPiH6eO  
   return TRUE; ps=jGh[  
 } < gB>j\:  
 return CDialog::PreTranslateMessage(pMsg); h\".TySz  
} 4wh_ iO  
Jaz|b`KDj  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) SO%x=W  
{ h~haA8i?{  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ?rID fEvV  
  SaveBmp(); n.jF:  
  return FALSE; eKi/Mt  
} yG|^-O}L  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 5!u.w  
 CMenu pop; w^Qb9vTa8  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ln%xp)t  
 CMenu*pMenu=pop.GetSubMenu(0); J/S 47J~  
 pMenu->SetDefaultItem(ID_EXITICON); _Qg^>}]A1  
 CPoint pt; \PU3{_G]  
 GetCursorPos(&pt); 0&T0Ls#4  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 6wC|/J^  
 if(id==ID_EXITICON) u}Vc2a,WV  
  DeleteIcon(); s8Kf$E^?e.  
 else if(id==ID_EXIT) 'b#RfF,7H}  
  OnCancel(); yE[ -@3v  
 return FALSE; ga&l.:lo  
} wU,{ 5w  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 7_C;-  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) qYv/" 1  
 AddIcon(); *5Upb,* *  
 return res; x'kwk  
} N p9N#m?  
>FED*C4  
void CCaptureDlg::AddIcon() ?#?[6t  
{ ks|[`FH  
 NOTIFYICONDATA data; BqC, -gC  
 data.cbSize=sizeof(NOTIFYICONDATA); S6CM/  
 CString tip; RB<LZHZI  
 tip.LoadString(IDS_ICONTIP); | n5F_RL  
 data.hIcon=GetIcon(0); @Aa$k:_  
 data.hWnd=GetSafeHwnd(); !]1X0wo\  
 strcpy(data.szTip,tip); k_%2Ok   
 data.uCallbackMessage=IDM_SHELL; b);Pw"_2  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; RaT(^b(  
 data.uID=98; n B4)%  
 Shell_NotifyIcon(NIM_ADD,&data); N<o3pX2i]  
 ShowWindow(SW_HIDE); {|?OKCG{  
 bTray=TRUE; ~ l"70\&  
} Cc*"cQe  
wLwAtjW)  
void CCaptureDlg::DeleteIcon() 1];rW`Bw  
{ N"M K 0k  
 NOTIFYICONDATA data; EeGP E  
 data.cbSize=sizeof(NOTIFYICONDATA); ModwJ w  
 data.hWnd=GetSafeHwnd(); c#sPM!!  
 data.uID=98; 'U ',9  
 Shell_NotifyIcon(NIM_DELETE,&data); U ^1Xc#Ff  
 ShowWindow(SW_SHOW); dA >=#/"  
 SetForegroundWindow(); A5-y+   
 ShowWindow(SW_SHOWNORMAL); OJ8ac6cJ  
 bTray=FALSE; !9=hUpRN  
} [.4R ,[U  
=g4^tIYq  
void CCaptureDlg::OnChange() "3o{@TdU  
{ 2?YN8 n9n  
 RegisterHotkey(); N^7Qn*qt[  
} &No6k~T0:b  
N %N %  
BOOL CCaptureDlg::RegisterHotkey() f!hQ"1[  
{ L6`(YX.:  
 UpdateData(); Eyi^N0  
 UCHAR mask=0; `s#0/t  
 UCHAR key=0; jn vJ`7zFP  
 if(m_bControl) >Ia{ZbQV  
  mask|=4; H~%HTl  
 if(m_bAlt) &ywAzGV{s  
  mask|=2; Nq'Cuwsp  
 if(m_bShift) j<H`<S  
  mask|=1; lx*"Pj9hho  
  key=Key_Table[m_Key.GetCurSel()]; ~_ss[\N  
 if(bRegistered){ USfpCRj9  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); MMg"G6?  
  bRegistered=FALSE; [of{~  
 } \Z9+U:n  
 cMask=mask; hZ NS$  
 cKey=key; Z$!>hiz2  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); B:S/ ?v  
 return bRegistered; [1Pw2MC<  
} OAPR wOQ^=  
&LM@_P"T  
  四、小结 r&sm&4)p-5  
WLGk  
  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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