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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: IV\'e}  
  K|hjEQRv  
  一、实现方法 xgKdMW'%g:  
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  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: 6 '!4jh  
\ b?" b  
#pragma data_seg("shareddata") }:KEj_~.  
HHOOK hHook =NULL; //钩子句柄 +~mA}psr  
UINT nHookCount =0; //挂接的程序数目 IJ(  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ~nh:s|l6%M  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 CkoL TY  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey C(#u[8  
static int KeyCount =0; j/f?"VEr  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ?"i}^B`*  
#pragma data_seg() !O:y@  
2ZG5<"DQ"  
  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。 5 ft`zf  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: XkXHGDEf1  
->y J5smtY  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Z7hgA-t  
cKey,UCHAR cMask) 4{rZppm  
{ 0 yuW*z  
 BOOL bAdded=FALSE; 7BK0}sxO  
 for(int index=0;index<MAX_KEY;index++){ 2\jPv`Ia  
  if(hCallWnd[index]==0){ x,|hU@h  
   hCallWnd[index]=hWnd;  CohDO  
   HotKey[index]=cKey; ifUGY[L  
   HotKeyMask[index]=cMask; QgU8 s'e  
   bAdded=TRUE; ]yx$(6_U  
   KeyCount++; WaVtfg$!  
   break; 'B 43_  
  } )4<__|52"1  
 } qln3 k`  
 return bAdded; .<x&IJ /  
} Lvq>v0|  
//删除热键 a!< 8\vzg  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) j/r]wd"aUS  
{ A+"ia1p,}  
 BOOL bRemoved=FALSE; h]5C|M|  
 for(int index=0;index<MAX_KEY;index++){ _wkVwPr  
  if(hCallWnd[index]==hWnd){ AX;8^6.F3  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ g X ]-\  
    hCallWnd[index]=NULL; 5_I->-<  
    HotKey[index]=0; ]b7zJUz  
    HotKeyMask[index]=0; l_P-j 96WD  
    bRemoved=TRUE; % NA9{<I  
    KeyCount--; @eD):Y  
    break; E .7  
   } hb zC#@ q  
  } ;V*R*R  
 } aY'C%^h]  
 return bRemoved; 'IZI:V"  
} :km61  
u frW\X  
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  DLL中的钩子函数如下: Kw efs;<E?  
?s\:hNNY  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 4zev^FR  
{ }!"A!~&  
 BOOL bProcessed=FALSE; 5][Ztx  
 if(HC_ACTION==nCode) \K@'Z  
 { <j*;.yyC  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 l6YtEHNG  
   switch(wParam) z=rT%lz6  
   {  f&eK|7J_Yf  
    case VK_MENU: *c~T@m~DR  
     MaskBits&=~ALTBIT;  `x l   
     break; {1V($aBl  
    case VK_CONTROL: .y_/Uwu  
     MaskBits&=~CTRLBIT;  tBq nf v  
     break; iVp,e  
    case VK_SHIFT: ;> _$`  
     MaskBits&=~SHIFTBIT; uw [<5  
     break; rai3<_W<  
    default: //judge the key and send message M9V q -U18  
     break; u.d).da  
   } so"$m  
   for(int index=0;index<MAX_KEY;index++){ Ss~;m']68  
    if(hCallWnd[index]==NULL) $ACvV "b  
     continue; ]+|~cRQ9I  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ';TT4$(m  
    { TD'L'm|2  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); w[9|cgCY  
     bProcessed=TRUE; tw^,G(  
    } *AoR==:ya  
   } X%Z{K-  
  } 6|aKL[%6  
  else if((lParam&0xc000ffff)==1){ //有键按下 BGOuDKz9C  
   switch(wParam) P;P%n  
   { 4]h =yc R  
    case VK_MENU: 9z}uc@#D=m  
     MaskBits|=ALTBIT; 73V|6tmgY  
     break; 3a?o3=  
    case VK_CONTROL: *+j* {>E  
     MaskBits|=CTRLBIT; gZLP\_CL  
     break; .q `Hjmg<  
    case VK_SHIFT: ZAv,*5&<  
     MaskBits|=SHIFTBIT; G?E oPh^m  
     break; Gnfd;. (.  
    default: //judge the key and send message l^|UCgRn  
     break; c0%"&a1]]V  
   } R_sr?V|"  
   for(int index=0;index<MAX_KEY;index++){ NWM8[dI  
    if(hCallWnd[index]==NULL) h3bff#<K  
     continue; jp0<pw_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Min ^>  
    { B$b +Ymu  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); {DU`[:SQZg  
     bProcessed=TRUE; .q9 $\wM/  
    } 2 $?C7(kW  
   } p3 w  
  } q:dHC,fO  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 2^^`n1?'  
   for(int index=0;index<MAX_KEY;index++){ k Mu8"Az  
    if(hCallWnd[index]==NULL) vg3=8>#  
     continue; U<CTubF  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) `glBV`?^  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Z?%zgqTXb  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 e6d<dXx  
   } ~kZ G{  
  } $lLz 3YS  
 } xL{a  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); R $&o*K`?  
} )xbHCoU,  
WN01h=1J_  
  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: $Hj.{;eC/k  
pL{U `5S  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); (CsD*U`h  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); p4'G$]#  
.u4 W /  
  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: ZaL.!g  
B5X(ykaX~  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Cq%IE^g<  
{ 13@|w1/Z  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) R:#k%}W  
 { B)qWtMZx  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 cUY`97bn  
  SaveBmp(); MO n  
  return FALSE; K2J \awX  
 } !t gi  
 …… //其它处理及默认处理 ]=>F.GE  
} 1(|'WyD  
>[_f3;P  
Ib+Y~ XYR  
  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。 [[;e)SoA  
P;Ga4Q.  
  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。 maXG:l|  
f' 3q(a<p  
  二、编程步骤 <})2#sZO!  
b/C`J p  
  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"; cVv;Jn  
J/[=p<I)  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Jo@|"cE=  
U$_xUG  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; ][?G/*k  
w+1 |9Y  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; P] UJ0b  
4cl\^yD  
  5、 添加代码,编译运行程序。 m<j8cJ(  
xwJH(_-  
三、程序代码 .HkL2m  
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///////////////////////////////////// Hook.h : main header file for the HOOK DLL f;1K5Y  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Q\ U:~g3  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ o1FF"tLkN  
#if _MSC_VER > 1000 D"ND+*Q [X  
#pragma once ^eR%N8Z  
#endif // _MSC_VER > 1000 %l,,_:7{  
#ifndef __AFXWIN_H__ ]3KhgK%c8  
#error include 'stdafx.h' before including this file for PCH }M3fmAP}  
#endif }Rz3<eON  
#include "resource.h" // main symbols 6P5Ih  
class CHookApp : public CWinApp 1@QZnF5[  
{ .pN`;*7`  
 public: Qzlo'e1  
  CHookApp(); rzh#CnL3  
  // Overrides ]cGA~d  
  // ClassWizard generated virtual function overrides Y6Lf@}2(i  
  //{{AFX_VIRTUAL(CHookApp) (&+kl q  
 public: .)<(Oj|4  
  virtual BOOL InitInstance(); vfq%H(  
  virtual int ExitInstance(); Gcig*5   
  //}}AFX_VIRTUAL l,,> & F  
  //{{AFX_MSG(CHookApp) HmiJ~C_v`:  
  // NOTE - the ClassWizard will add and remove member functions here. XI22+@d6  
  // DO NOT EDIT what you see in these blocks of generated code ! AO=h 23ZI  
  //}}AFX_MSG uoXAQ6k  
  DECLARE_MESSAGE_MAP() .h>8@5/s  
}; WnGGo ' Z  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ,:Lb7bFv>  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); *g[^.Sg  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); tb$LriN  
BOOL InitHotkey(); *X, /7C   
BOOL UnInit(); [BT/~6ovrZ  
#endif /C4^<k\  
w0C~*fn3l  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. gMaN)ESqd4  
#include "stdafx.h" il \$@Bn  
#include "hook.h" nSkPM 5\TI  
#include <windowsx.h> S6AU[ASY.  
#ifdef _DEBUG IiZ&Pr  
#define new DEBUG_NEW CC@.MA@9N  
#undef THIS_FILE [&nh5 |f  
static char THIS_FILE[] = __FILE__; tPGJ<30  
#endif 5JLu2P  
#define MAX_KEY 100 U)o$WH.b  
#define CTRLBIT 0x04 L30$%G|  
#define ALTBIT 0x02 x >^Si/t  
#define SHIFTBIT 0x01 ngat0'oa  
#pragma data_seg("shareddata") T9u<p=p  
HHOOK hHook =NULL; E[bd@[N 8  
UINT nHookCount =0; dVFf.  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 4y5UkU9|  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 3l3'bw2  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Ns[ym>x#2  
static int KeyCount =0; 6+KHQFb&N  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 9> g,  
#pragma data_seg() 8G5m{XTS(  
HINSTANCE hins; y;AL'vm9  
void VerifyWindow(); =@8H"&y`  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 8kIR y   
//{{AFX_MSG_MAP(CHookApp) (>I`{9x>6  
// NOTE - the ClassWizard will add and remove mapping macros here. gW1b~( fD  
// DO NOT EDIT what you see in these blocks of generated code! y:h}z).  
//}}AFX_MSG_MAP nYa*b=[.  
END_MESSAGE_MAP() *L'>U[Pl7  
hwI Mn33  
CHookApp::CHookApp() I~9hx*!%%  
{ ~DsECnD  
 // TODO: add construction code here, IW% |G  
 // Place all significant initialization in InitInstance U=o"32n+  
} -M1YE  
~2zM kVH  
CHookApp theApp; acw4B5]  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) }oKG}wgY  
{ DmBS0NyR7Y  
 BOOL bProcessed=FALSE; f~_th @K  
 if(HC_ACTION==nCode) "/nNM{^  
 { YTjkPj:  
  if((lParam&0xc0000000)==0xc0000000){// Key up UD)e:G[Gat  
   switch(wParam) D^-7JbE]  
   { yx<WSgWZ[  
    case VK_MENU: G_dsrpI=N  
     MaskBits&=~ALTBIT; a+9 *@z2  
     break; h#hxOVl%x  
    case VK_CONTROL: @5[kcU>  
     MaskBits&=~CTRLBIT; 6Vbzd0dk  
     break; >"@?ir  
    case VK_SHIFT: 03iv3/{H  
     MaskBits&=~SHIFTBIT; >R2SQA o  
     break; p*8-W(u)  
    default: //judge the key and send message o8Z[+;  
     break; "9bN+1[<  
   } $ A9%UhV  
   for(int index=0;index<MAX_KEY;index++){ .?>5-od2  
    if(hCallWnd[index]==NULL) hHPs&EA.p  
     continue; "aFhkPdWn  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~-83Q5/[  
    { ,\aUq|~  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); rO:u6."_  
     bProcessed=TRUE; \Fe_rh  
    } 0K-*WQ*#9  
   } 4A3nO<o MF  
  } :vL1}H<  
  else if((lParam&0xc000ffff)==1){ //Key down l6u&5[C  
   switch(wParam) x5Z-{"  
   { o|j*t7  
    case VK_MENU: :EtMH(  
     MaskBits|=ALTBIT; tyDY'W\]  
     break; -OYDe@Wb]  
    case VK_CONTROL: M@thI%lR  
     MaskBits|=CTRLBIT; \Yoa:|%*y  
     break; =9LC<2  
    case VK_SHIFT: (.Lrmf@hI7  
     MaskBits|=SHIFTBIT; (#oycj^<  
     break; ?QA\G6i4  
    default: //judge the key and send message h)v^q: ='  
     break; vLO&Lpv  
   } +} mk>e/  
   for(int index=0;index<MAX_KEY;index++) ==cd>03()  
   { 'lS `s(  
    if(hCallWnd[index]==NULL) s(_+!d6  
     continue; Y?#i{ixX6n  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6TH!vuQ1(  
    { L z\UZeq  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); -K[782Q  
     bProcessed=TRUE; G]Jz"xH#  
    } kHJ96G  
   } MbXq`%  
  } I|/'Ds:  
  if(!bProcessed){ :h:@o h_=  
   for(int index=0;index<MAX_KEY;index++){ = c~I .  
    if(hCallWnd[index]==NULL) M)cGz$Q|  
     continue; 9B)(>~q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) \nqo%5XL  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); -iCcoA  
   } s{/qS3=  
  } P=H+ #  
 } =w<v3wWN4  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); P.sgRsL  
} x:t<ZG&Xwg  
:Y)to/h  
BOOL InitHotkey() y7<&vIEC  
{ e@F|NCQ.9  
 if(hHook!=NULL){ /!Z^Y  
  nHookCount++; $gp!w8h  
  return TRUE; I"xWw/Ec  
 } w5]l1}rl  
 else s>z2  k  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); KIL18$3J  
  if(hHook!=NULL) 3z{S}~  
   nHookCount++; 2r ];V'r  
  return (hHook!=NULL); bO49GEUT _  
} uC~g#[I QM  
BOOL UnInit() MY-.t-3  
{ ew#T8F[  
 if(nHookCount>1){ ^Y^"'"  
  nHookCount--; f|xLKcOP  
  return TRUE; !W1eUY  
 } U |F>W~%  
 BOOL unhooked = UnhookWindowsHookEx(hHook); nR8]@cC  
 if(unhooked==TRUE){ 8U.$FMx :  
  nHookCount=0; '=} Y2?(  
  hHook=NULL; 0^]t"z5f0  
 } N"DY?6  
 return unhooked; zj]b&In6;  
} ID8k/t!  
I{dl%z73  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 2 X<nn  
{ 9y"TDo  
 BOOL bAdded=FALSE; @)sc6 *lnW  
 for(int index=0;index<MAX_KEY;index++){ i+~QDo(Pi  
  if(hCallWnd[index]==0){ PI7IBI  
   hCallWnd[index]=hWnd; Um ;kd&#x  
   HotKey[index]=cKey; GhnE>d;i  
   HotKeyMask[index]=cMask; \; bW h  
   bAdded=TRUE; tE!'dpG5)  
   KeyCount++; MM_py!=>7  
   break; h3J*1  
  } umDtp\  
 } N^B@3QF  
 return bAdded; 3.)_uo0;o  
} >=!AL,:  
e?)yb^7K  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)  ,o&<WMD  
{ T|f_~#?eV  
 BOOL bRemoved=FALSE; g)M#{"H  
 for(int index=0;index<MAX_KEY;index++){ ~\bHfiIDy  
  if(hCallWnd[index]==hWnd){ J_/05( 48  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ u.&|CF-  
    hCallWnd[index]=NULL; !'PlDGD  
    HotKey[index]=0; X0x_+b? _  
    HotKeyMask[index]=0; cX"G7Bh  
    bRemoved=TRUE; i-V0Lm/  
    KeyCount--; 'WnpwY  
    break; 8AX3C s_G  
   } `g8tq  
  } ,A?v,Fs>O[  
 } 1?]J;9p  
 return bRemoved; |bvGYsn_#=  
} 7?]!Ecr"  
F$C+R&V_  
void VerifyWindow() Ds G !S*  
{ E$&;]a  
 for(int i=0;i<MAX_KEY;i++){ W#Cq6N  
  if(hCallWnd!=NULL){ +ks$UvtY  
   if(!IsWindow(hCallWnd)){ " xxXZGUp  
    hCallWnd=NULL; JSUzEAKe  
    HotKey=0; k#-[ M.i  
    HotKeyMask=0; xF^r`  
    KeyCount--; }(rzH}X@  
   } 1[# =,  
  } x6~Fb~aP  
 } ILIRI[7 (  
} td`wNy\  
I$F\(]"@  
BOOL CHookApp::InitInstance() `ITDTZ J  
{ &,Uc>L%m  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 9`E-dr9  
 hins=AfxGetInstanceHandle(); ~v,!n/('  
 InitHotkey();  MbM :3  
 return CWinApp::InitInstance(); }" g@E-]N  
} r ufRaar  
@D2`*C9  
int CHookApp::ExitInstance() ud!r*E  
{ t>=GVu^  
 VerifyWindow(); N_|YOw6  
 UnInit(); N/`g?B[  
 return CWinApp::ExitInstance(); 6pS Rum  
} \y<+Fac1S  
N n:m+ZDo^  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Q9SPb6O2  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) s; ~J2h[  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ vs* _;vx  
#if _MSC_VER > 1000 48W:4B'l9  
#pragma once 06Sqn3MB  
#endif // _MSC_VER > 1000 t,UW&iLK  
=#J 9  
class CCaptureDlg : public CDialog 8'>.#vyMGv  
{ u_$6LEp-  
 // Construction H 7 o$O  
 public: ]g>T9,)l  
  BOOL bTray; P1vF{e  
  BOOL bRegistered; 5LnB]dW  
  BOOL RegisterHotkey(); w4 >:uyE  
  UCHAR cKey; zhD`\&G.  
  UCHAR cMask; K .c6Rg  
  void DeleteIcon(); o%QhV6(F  
  void AddIcon(); WcQZFtW  
  UINT nCount; =t <:zLe  
  void SaveBmp(); Xb8:*Y1'  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 9.]Cy8  
  // Dialog Data .XZ 71E  
  //{{AFX_DATA(CCaptureDlg) _,Io(QS  
  enum { IDD = IDD_CAPTURE_DIALOG }; L.R\]+$U2  
  CComboBox m_Key; M<hs_8_*  
  BOOL m_bControl; $/-wgyP3m+  
  BOOL m_bAlt; 4l#T_y  
  BOOL m_bShift; :$u{  
  CString m_Path; =[O<.'aG-  
  CString m_Number; 1yY'hb,0  
  //}}AFX_DATA +;4AG::GN  
  // ClassWizard generated virtual function overrides pU\xzLD  
  //{{AFX_VIRTUAL(CCaptureDlg) ;Ln7_  
 public: ()rx>?x5  
  virtual BOOL PreTranslateMessage(MSG* pMsg); \5v=pDd4g  
 protected:  G> 5=`  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support x Jj8njuq4  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam);  K{7S  
  //}}AFX_VIRTUAL p'9 V. _h  
  // Implementation cnjj) c  
 protected: ^me}k{x  
  HICON m_hIcon; 1Tts3O .  
  // Generated message map functions QL|:(QM  
  //{{AFX_MSG(CCaptureDlg) =QO1FO  
  virtual BOOL OnInitDialog(); Rqd%#v  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); x X=IMM3  
  afx_msg void OnPaint(); ,nuDoc  
  afx_msg HCURSOR OnQueryDragIcon(); J.+?*hcw  
  virtual void OnCancel(); 5)o-]S>  
  afx_msg void OnAbout(); =G3J.S*Riy  
  afx_msg void OnBrowse(); k%4A::=  
  afx_msg void OnChange();  C.TCDl  
 //}}AFX_MSG IQ27FV|3  
 DECLARE_MESSAGE_MAP() QP-<$P;~  
}; ;V}FbWz^v6  
#endif IbNTdg]/F`  
,:Ix s^-  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file zI*/u)48  
#include "stdafx.h" K]=>F  
#include "Capture.h" wW)&Px n  
#include "CaptureDlg.h" `peJ s~V  
#include <windowsx.h> IUBps0.T\  
#pragma comment(lib,"hook.lib") wx?{|  
#ifdef _DEBUG G5eLs  
#define new DEBUG_NEW v!v0,?b*  
#undef THIS_FILE B}xo|:f!zj  
static char THIS_FILE[] = __FILE__; {Z{NH:^  
#endif qh'f,#dI}  
#define IDM_SHELL WM_USER+1 H ]N/Y{  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 5['B- Iw  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); O|g!Y(  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; *fy`JC  
class CAboutDlg : public CDialog {G*:N[pJp  
{ E0?\DvA  
 public: eG)/&zQ8  
  CAboutDlg(); ez<wEt S  
  // Dialog Data %A[p!U  
  //{{AFX_DATA(CAboutDlg) NbK?Dg8WJG  
  enum { IDD = IDD_ABOUTBOX }; A#07Ly8kXn  
  //}}AFX_DATA :+V1682u  
  // ClassWizard generated virtual function overrides b-=[(]_$h  
  //{{AFX_VIRTUAL(CAboutDlg) 0 Vgn N  
 protected: jKi*3-&  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support T4, Zc  
  //}}AFX_VIRTUAL  ,IvnNnl2  
  // Implementation B7jlJqV  
 protected: |&pz,"(  
  //{{AFX_MSG(CAboutDlg) QbKYB  
  //}}AFX_MSG aw@Aoq  
  DECLARE_MESSAGE_MAP() 'krMVC-  
}; an5kR_=  
nQYS{`hk  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) v'~nABYH  
{ a0j.\g  
 //{{AFX_DATA_INIT(CAboutDlg) u~T$F/]k>  
 //}}AFX_DATA_INIT Xm[r#IA  
} <!nWiwv  
|JQP7z6j]  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) hADb]O  
{ w`!foPE  
 CDialog::DoDataExchange(pDX); w 4gZ:fR=  
 //{{AFX_DATA_MAP(CAboutDlg) 5J#g JFA  
 //}}AFX_DATA_MAP K#+]  
} 4qXUk:C@m  
8ch~UBq/  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) `1v!sSR0R  
 //{{AFX_MSG_MAP(CAboutDlg) $aI MQ[(  
 // No message handlers \gQ+@O&+  
 //}}AFX_MSG_MAP _89G2)U=C  
END_MESSAGE_MAP() fQA)r  
i/EiUH/~  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ik NFW*p  
: CDialog(CCaptureDlg::IDD, pParent) A,[m=9V  
{ RV*Zi\-X  
 //{{AFX_DATA_INIT(CCaptureDlg) PC7.+;1  
  m_bControl = FALSE; ;p"XCLHl  
  m_bAlt = FALSE; 9i)mv/i  
  m_bShift = FALSE; <ORz`^27o  
  m_Path = _T("c:\\"); =F-^RnO%\  
  m_Number = _T("0 picture captured."); Ln%_8yth  
  nCount=0; 10a*7 L  
  bRegistered=FALSE; @Lv_\^2/}  
  bTray=FALSE; j1CD;9i)%  
 //}}AFX_DATA_INIT {O oNhN9  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 toZI.cSg4  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); r.5Js*VX!  
}  Kj|F  
% +"AF+c3r  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) k GeME   
{ KgAX0dM  
 CDialog::DoDataExchange(pDX); 3n)iTSU3  
 //{{AFX_DATA_MAP(CCaptureDlg) 9)hC,)5  
  DDX_Control(pDX, IDC_KEY, m_Key); * rANf&y  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); LVtQ^ 5>8  
  DDX_Check(pDX, IDC_ALT, m_bAlt);  o%4+I>  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ul&7hHp_u%  
  DDX_Text(pDX, IDC_PATH, m_Path); P(+ar#,G  
  DDX_Text(pDX, IDC_NUMBER, m_Number); x=+I8Q4:  
 //}}AFX_DATA_MAP K'/x9.'%  
} F5q1VEe  
OHvzK8  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ?0&>?-?  
//{{AFX_MSG_MAP(CCaptureDlg) rzj'!~>U  
 ON_WM_SYSCOMMAND() >c>ar>4xF  
 ON_WM_PAINT() w%H#>k  
 ON_WM_QUERYDRAGICON() G7JZP T  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) L%s""nP  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) DNO%J^  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ebVfny$D  
//}}AFX_MSG_MAP *Yjs$'_2  
END_MESSAGE_MAP() [B<{3*R_  
bxHk0w  
BOOL CCaptureDlg::OnInitDialog() <Y6>L};  
{ \Rt  
 CDialog::OnInitDialog(); 41D[[Gh  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); nu -wQr  
 ASSERT(IDM_ABOUTBOX < 0xF000); HJrg  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Om{ML,d  
 if (pSysMenu != NULL) CI{TgL:l  
 { <7Lz<{jaJ  
  CString strAboutMenu; @V u[Tg}J  
  strAboutMenu.LoadString(IDS_ABOUTBOX); JPzPL\  
  if (!strAboutMenu.IsEmpty()) &bx,6dX  
  { ;<rJ,X#  
   pSysMenu->AppendMenu(MF_SEPARATOR); ^i 7a2< z  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 4D$E  
  } j* ?MFvwE  
 } qeGOSGc_  
 SetIcon(m_hIcon, TRUE); // Set big icon jGPs!64f)  
 SetIcon(m_hIcon, FALSE); // Set small icon _RVXE  
 m_Key.SetCurSel(0); 5G[^ah<Tg  
 RegisterHotkey(); pDfF'jt9  
 CMenu* pMenu=GetSystemMenu(FALSE); 2O>iAzc  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); YJ`>&AJ  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); >cLZP#^\2E  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 7T78S&g  
 return TRUE; // return TRUE unless you set the focus to a control `R;XN-  
} !;oBvE7Kh  
wEyh;ID3#  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) }=5(*Vg  
{ <L 0_< T  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 3]A'C&  
 { :-n4! z"k  
  CAboutDlg dlgAbout; S5M t?v|K  
  dlgAbout.DoModal(); 6A<aelE*i  
 } dXQWT@$y!E  
 else >d |W>|8e  
 { R lu;l  
  CDialog::OnSysCommand(nID, lParam); gUl Z cb  
 } u5,<.#EVY  
} &3M He$  
eyOAG4QTV  
void CCaptureDlg::OnPaint() Gl(,%~F9i  
{ +{&g|V  
 if (IsIconic()) 2*N# %ZUX  
 { [ q}WS5Cp  
  CPaintDC dc(this); // device context for painting w*x}4wW  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); pw8'+FX  
  // Center icon in client rectangle a?dM8zAnc  
  int cxIcon = GetSystemMetrics(SM_CXICON); TM9>r :j'  
  int cyIcon = GetSystemMetrics(SM_CYICON); G1BVI:A&S  
  CRect rect; dBkB9nz  
  GetClientRect(&rect); Z2r\aZ-d`  
  int x = (rect.Width() - cxIcon + 1) / 2; `1dr$U  
  int y = (rect.Height() - cyIcon + 1) / 2; [dUEe@P  
  // Draw the icon JT<J[Qz5  
  dc.DrawIcon(x, y, m_hIcon); :Li)]qN.I  
 } ]d0Dd")n  
 else N|; cG[W  
 { riz({  
  CDialog::OnPaint(); IdM ;N  
 } >ObpOFb%  
} S<44{ oH  
x<"e  
HCURSOR CCaptureDlg::OnQueryDragIcon() vv3?ewr y  
{ $k dfY'u  
 return (HCURSOR) m_hIcon; FM5$83Q  
} LcXrD+ 1  
tpS F[W  
void CCaptureDlg::OnCancel() 94+#6jd e  
{ tSjK=1"}  
 if(bTray) Wr;)3K  
  DeleteIcon(); _oWenF  
  CDialog::OnCancel(); rW6LMkt72  
} =1D*K%  
0x84 Ah)  
void CCaptureDlg::OnAbout() q /#O :Q  
{ drH!?0Dpg  
 CAboutDlg dlg; 3|C"F-'<  
 dlg.DoModal(); B $HQFdTli  
} j \SDw  
k[][Md2Vh  
void CCaptureDlg::OnBrowse() Y?> S.B7  
{ f!87JE=<  
 CString str; /g2 1.*Z  
 BROWSEINFO bi; L\"$R":3{d  
 char name[MAX_PATH]; b{sFN !  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); KxvT}"k  
 bi.hwndOwner=GetSafeHwnd(); 8`*(lKiL  
 bi.pszDisplayName=name; G"'DoP7p9  
 bi.lpszTitle="Select folder"; bf3)^ 49}  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 8F%T Z M  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Z:'2pu U+?  
 if(idl==NULL) WvR}c  
  return; UHXlBH@  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); :yv!  x  
 str.ReleaseBuffer(); 4}gwMjU-B  
 m_Path=str; aPWFb.JO4  
 if(str.GetAt(str.GetLength()-1)!='\\') J9 /w_,,R$  
  m_Path+="\\"; 4((Z8@iX/  
 UpdateData(FALSE); )p&xpB(  
} ]J~5{srq:  
I@.qon2V  
void CCaptureDlg::SaveBmp() KExfa4W 3{  
{ 5e/%Tue.  
 CDC dc; y:1?~R  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); qoOHWh&  
 CBitmap bm; VGTo$RH  
 int Width=GetSystemMetrics(SM_CXSCREEN); b\}`L"  
 int Height=GetSystemMetrics(SM_CYSCREEN); "|f;   
 bm.CreateCompatibleBitmap(&dc,Width,Height); |GIT{_JE  
 CDC tdc; #* w$JH  
 tdc.CreateCompatibleDC(&dc); X]`\NNx  
 CBitmap*pOld=tdc.SelectObject(&bm); 5^ pQ=Sgt  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); eK]GyY/Y  
 tdc.SelectObject(pOld); Z$2mVRS`c  
 BITMAP btm; )M1.>?b  
 bm.GetBitmap(&btm); K":- zS  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; k/Cr ^J"  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); L[IjzxUv  
 BITMAPINFOHEADER bih; m"u 9AOHk  
 bih.biBitCount=btm.bmBitsPixel; _w)0r}{  
 bih.biClrImportant=0; U; ev3  
 bih.biClrUsed=0; #LF_*a0v  
 bih.biCompression=0; 3fpX  
 bih.biHeight=btm.bmHeight; GJ!usv u  
 bih.biPlanes=1; hd+JKh!u  
 bih.biSize=sizeof(BITMAPINFOHEADER); F/mD05{  
 bih.biSizeImage=size; 8amtTM  
 bih.biWidth=btm.bmWidth; 594$X@ !v  
 bih.biXPelsPerMeter=0; \,~gA   
 bih.biYPelsPerMeter=0; 0\u_ \%[  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ; <3w ,r  
 static int filecount=0; |U12 fuQ  
 CString name; A*W QdY  
 name.Format("pict%04d.bmp",filecount++); IhUuL0  
 name=m_Path+name; (Iu5QLE  
 BITMAPFILEHEADER bfh; =$f xK  
 bfh.bfReserved1=bfh.bfReserved2=0; O>H4hp  
 bfh.bfType=((WORD)('M'<< 8)|'B'); \}Hk`n)Aq  
 bfh.bfSize=54+size; tw^V?4[Miu  
 bfh.bfOffBits=54; 5JQq?e)n  
 CFile bf; cpf8f i  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ~ 5`Ngpp  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); YAsvw\iseK  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); )\p@E3Uxf  
  bf.WriteHuge(lpData,size); T< P4+#JK  
  bf.Close(); _)lK.5  
  nCount++; DAJh9I  
 } owQLAV  
 GlobalFreePtr(lpData); 2Ask]  
 if(nCount==1) -0lpsF  
  m_Number.Format("%d picture captured.",nCount); O=ci"2!\-  
 else |)1"*`z  
  m_Number.Format("%d pictures captured.",nCount); y=-d*E  
  UpdateData(FALSE); ZO:{9vt=/  
}  Q"%L  
-K+grsb g  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) J>x)J}:;  
{ :N(L7&<  
 if(pMsg -> message == WM_KEYDOWN) +HUI1@ql  
 { dA)7d77  
  if(pMsg -> wParam == VK_ESCAPE) yU&A[DZQ  
   return TRUE; UI |D?z<  
  if(pMsg -> wParam == VK_RETURN) F^KoEWj[H  
   return TRUE; W&6ye  
 } @zSoPDYv,  
 return CDialog::PreTranslateMessage(pMsg); H`m| R  
} dc"Vc 3)  
Onby=Y o6  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) DH @*Oz-  
{ L<J%IlcfO  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ .GLotc  
  SaveBmp(); {P(IA2J'S  
  return FALSE; v||8Q\d  
} (eG#JVsm9  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ [K%J t  
 CMenu pop; [JsQ/|=z  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); lLo FM  
 CMenu*pMenu=pop.GetSubMenu(0); uflp4_D   
 pMenu->SetDefaultItem(ID_EXITICON); 2= u5N[*  
 CPoint pt; 4d[:{/+Q  
 GetCursorPos(&pt); t~gnai  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); j =[Td   
 if(id==ID_EXITICON) ^P(HX  
  DeleteIcon(); Ch^Al 2)=  
 else if(id==ID_EXIT) J1&G1\G|s=  
  OnCancel(); %;9wToyK>  
 return FALSE; |\Jpjm)?  
} LR'F/.Dx  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 5=5~GX-kr  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) MhHygZT[}  
 AddIcon(); wIL5-k,  
 return res; ^BSMlKyB  
} wQ@@|Cj4L  
.,UpI|b  
void CCaptureDlg::AddIcon() rEz=\yY^j'  
{ W/xb[w9v  
 NOTIFYICONDATA data; l\jf]BHX'  
 data.cbSize=sizeof(NOTIFYICONDATA); &nTB^MF  
 CString tip; *_3+ DF  
 tip.LoadString(IDS_ICONTIP); /k(0}g=\  
 data.hIcon=GetIcon(0); :1=mNrg  
 data.hWnd=GetSafeHwnd(); .,<-lMC+  
 strcpy(data.szTip,tip); ;g7 nG{  
 data.uCallbackMessage=IDM_SHELL; [u=b[(  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; -i7W|X"  
 data.uID=98; 4:5CnK  
 Shell_NotifyIcon(NIM_ADD,&data); 315Rk!{AJ  
 ShowWindow(SW_HIDE); i{!i %`"  
 bTray=TRUE; \} P}H  
} OT\[qaK  
zT`LPs6T  
void CCaptureDlg::DeleteIcon() l^WFMeMD3a  
{ , B h[jb`y  
 NOTIFYICONDATA data; )# M*@e$k  
 data.cbSize=sizeof(NOTIFYICONDATA); Ga"$_DyM  
 data.hWnd=GetSafeHwnd(); 5}E8Tl  
 data.uID=98; k g0Z(T:&8  
 Shell_NotifyIcon(NIM_DELETE,&data); 'l!tQD!  
 ShowWindow(SW_SHOW); p8Ts5n  
 SetForegroundWindow(); WwPfz<I  
 ShowWindow(SW_SHOWNORMAL); \c_1uDRoUn  
 bTray=FALSE; ZSU;>&>%v  
} qbFzA i  
_hM3p  
void CCaptureDlg::OnChange() +mYD DlvI  
{ rG}o!I`z  
 RegisterHotkey(); pkM_ @K  
} &=xm>;`3  
cdf8YN0!  
BOOL CCaptureDlg::RegisterHotkey() =0MW+-  
{ /0\m;&  
 UpdateData(); LezM=om.  
 UCHAR mask=0; BoHMz/DB  
 UCHAR key=0; aKhI|%5kA  
 if(m_bControl) }q)o LC  
  mask|=4; a$l/N{<.  
 if(m_bAlt) J}nE,U2  
  mask|=2; uJ{N?  
 if(m_bShift) Pv+[N{  
  mask|=1; nkSYW]aQ1g  
  key=Key_Table[m_Key.GetCurSel()]; q_ykB8Ensa  
 if(bRegistered){ t%/Y^N;  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); G<Z|NT  
  bRegistered=FALSE; GNT1FR  
 } /F5g@ X&  
 cMask=mask; /`Yp]l  
 cKey=key; S6 `4&0'  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Kisd.~u8j  
 return bRegistered; I.euuzBgA  
} + i!/J  
d/j$_NQ&!  
  四、小结 qR--lvO  
K #}DXq  
  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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