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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: z\YIwrq3*  
  oFY!NMq}:  
  一、实现方法 ON?Y Df  
D$>_W,*V  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: ,pNx(a  
5pO|^G j1  
#pragma data_seg("shareddata") >.h:Y5  
HHOOK hHook =NULL; //钩子句柄 ,Z. sGv  
UINT nHookCount =0; //挂接的程序数目 4 1_gak;  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 *O?c~UJhhV  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 _n&Nw7d2 M  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ngY%T5-  
static int KeyCount =0; &)eg3P)7  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ?RRO  
#pragma data_seg() ^;C&  
rg/{5f  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 DwD$T%kF  
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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: ?KT{H( rU  
R1jl<=  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR pYO =pL^Q  
cKey,UCHAR cMask) 'CLZ7 pV  
{ qnm_#!&uHT  
 BOOL bAdded=FALSE; (8nv&|  
 for(int index=0;index<MAX_KEY;index++){ h}b:-a  
  if(hCallWnd[index]==0){ xNz(LZ.c  
   hCallWnd[index]=hWnd; #-hO\ QdC  
   HotKey[index]=cKey; v=`yfCX-qX  
   HotKeyMask[index]=cMask; x2"iZzQlD  
   bAdded=TRUE; 8:cbr/F<  
   KeyCount++; H= dIZ  
   break; ?^|`A}q#  
  } 4aayMS !#  
 } Hl*vS  
 return bAdded; ^xo<$zn  
} .nV2 n@SR  
//删除热键 >J"IN I  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 5/H,UL  
{ ,'#TdLe  
 BOOL bRemoved=FALSE; |dRVSVN  
 for(int index=0;index<MAX_KEY;index++){ 3"fDFR  
  if(hCallWnd[index]==hWnd){  Et>#&Nw8  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ qT O6I5u  
    hCallWnd[index]=NULL; OLw]BJXYaE  
    HotKey[index]=0; xm'9n?  
    HotKeyMask[index]=0; .Po"qoGy  
    bRemoved=TRUE; _vQ52H,  
    KeyCount--; j;x()iZ<  
    break; ez4!5&TzRm  
   } P<<$o-a"  
  } #h5:b`fDF  
 } t0)1;aBZ  
 return bRemoved; 8`=?_zF  
} 'r;mm^cS?  
O"m7r ds  
b0P3S!E  
  DLL中的钩子函数如下: dBWny&  
b F=MQ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) s.3"2waZ=T  
{ 3G} )$y3m  
 BOOL bProcessed=FALSE; ,5DJ54B!  
 if(HC_ACTION==nCode) b|#=kPVgL}  
 { ]TV_ p[L0B  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 'C+cQLig@  
   switch(wParam) pP<8zTLn  
   {  c{#2;k Q,  
    case VK_MENU: /qpSmRL  
     MaskBits&=~ALTBIT; h$S#fY8   
     break; =bKDD <(  
    case VK_CONTROL: R|; BO:S1  
     MaskBits&=~CTRLBIT; 1#vy# '  
     break; }$6L]   
    case VK_SHIFT: oOFTQB_6  
     MaskBits&=~SHIFTBIT; nep#L>LP$x  
     break; ;\MWxh,K  
    default: //judge the key and send message XqH@3Ehk  
     break; ^W |YE72Y  
   } kUT2/3Vi  
   for(int index=0;index<MAX_KEY;index++){ K;K0D@>]HR  
    if(hCallWnd[index]==NULL) 6Yai?*.Q  
     continue; ;?h[WIy  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) LG}{ibB  
    { xJq|,":gj  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); q8 v iC|  
     bProcessed=TRUE; qpQ;,8X-"  
    } iOL$|Z(  
   } l{By]S  
  } RQ+,7Ir  
  else if((lParam&0xc000ffff)==1){ //有键按下 !V|{(>+<  
   switch(wParam) }1a}pm2p  
   { ["Zvwes#7  
    case VK_MENU: G|i0n   
     MaskBits|=ALTBIT; \S}/2]* 1  
     break; zAgX{$/Fg  
    case VK_CONTROL: Z0gtliJ@  
     MaskBits|=CTRLBIT; Y;'<u\^M"  
     break; D 0Xl`0"'  
    case VK_SHIFT: ( eV,f  
     MaskBits|=SHIFTBIT; *&U~Io"U  
     break; *>fr'jj1$  
    default: //judge the key and send message $b8[/],  
     break; {!,K[QwcI  
   } ?Uql 30A  
   for(int index=0;index<MAX_KEY;index++){ l4C{LZ  
    if(hCallWnd[index]==NULL) _!xrBdaJ  
     continue; 8ud12^s$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) HoI6(t  
    { *WE8J#]d  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Q%e<0t7  
     bProcessed=TRUE; ?m7:@GOE1  
    } T(|'.&a  
   } I~,.@{4  
  } S^O9}<2g  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 YQ0#j'}/  
   for(int index=0;index<MAX_KEY;index++){ ^[<BMk  
    if(hCallWnd[index]==NULL) Pnytox  
     continue; qxZIH  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) y)kxR  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); y-<.l=6A  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 q,v<:sS9T  
   } QM,#:m1o  
  } {}$9 70y  
 } /=2aD5r  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); _p$/.~Xo9  
} _^ hg7&dF  
W>3S%2d  
  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: -^&=I3bp  
z/t|'8f  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); <2U#U;  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 7q0_lEh  
(/y8KG 3  
  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: .Fb#j+Lq  
J8i;E 4R  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 4v[y^P  
{ _i_='dsyW/  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) C qd\n#d/~  
 { @9/I^Zk  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 PV68d; $:8  
  SaveBmp(); ki1(b]rf  
  return FALSE; x0j5D  
 } '9\cIni0  
 …… //其它处理及默认处理 v9(5H Y  
} RZ6y5  
rr# nBhh8  
9r%fBiSk  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 "i&)+dr-  
B{Q}^Mcxy  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 <rC%$tr  
PMjNc_))  
  二、编程步骤 U[C>Aoze  
5|*{~O|  
  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"; d4o ^+\  
2A_1E \  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; MQ,K%_m8  
Hq.rG-,p  
  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; eV7;#w<]  
Vr2A7kq  
  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; gP_N|LuF"  
0ix(1`Z  
  5、 添加代码,编译运行程序。 >u=  
"FHJ_$!  
三、程序代码 C?qRZB+W#  
xG!~TQ  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 6_mi9_w  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) h<9vm[.  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ w/@ZPBRo]  
#if _MSC_VER > 1000 n#!c!EfG  
#pragma once }s,NM%oI  
#endif // _MSC_VER > 1000 #]h X ."b2  
#ifndef __AFXWIN_H__ F ~A $7  
#error include 'stdafx.h' before including this file for PCH Jg#0g eU  
#endif i(~DhXz*T  
#include "resource.h" // main symbols BTAbDyH5  
class CHookApp : public CWinApp h)Y] L#R  
{  3IxC@QR  
 public: t/|0"\ p  
  CHookApp(); |[],z 8  
  // Overrides t/ \S9  
  // ClassWizard generated virtual function overrides a1pp=3Pd?~  
  //{{AFX_VIRTUAL(CHookApp) @i ~A7L0/  
 public: UPtj@gtcY  
  virtual BOOL InitInstance(); ~ z^?+MgZ2  
  virtual int ExitInstance(); I\*6 >  
  //}}AFX_VIRTUAL %ap(=^|5  
  //{{AFX_MSG(CHookApp) SkuR~!  
  // NOTE - the ClassWizard will add and remove member functions here. b<FE   
  // DO NOT EDIT what you see in these blocks of generated code ! ('x]@  
  //}}AFX_MSG 4,y7a=qf3  
  DECLARE_MESSAGE_MAP() f*%kHfaXgN  
}; !Yof%%m$;  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); X>I3N?5  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); AJyN lQ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); W.3b]zcV  
BOOL InitHotkey(); T0 K!Msz  
BOOL UnInit(); 2^[dy>[y0  
#endif tz ;3  
1ksFxpE  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. UZ<K'H,q  
#include "stdafx.h" ;JxL>K(  
#include "hook.h" q,Gymh;  
#include <windowsx.h> puPI ^6y%  
#ifdef _DEBUG >/ay'EyY;>  
#define new DEBUG_NEW Zn9tG:V  
#undef THIS_FILE 8-#kY}d.  
static char THIS_FILE[] = __FILE__; m>=DJ{KQ  
#endif SKC;@?  
#define MAX_KEY 100 DS?.'"n[u  
#define CTRLBIT 0x04 4iAF<|6s  
#define ALTBIT 0x02 :#:|:q.]  
#define SHIFTBIT 0x01 3\W/VBJJ  
#pragma data_seg("shareddata") hs7!S+[.$$  
HHOOK hHook =NULL; N sdpE?V  
UINT nHookCount =0; }y6)d.  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey @43psq1  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT <,CrE5Pl  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey N3"JouP  
static int KeyCount =0; <0d2{RQ;  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift  G*z\ ^H  
#pragma data_seg() qyM/p.mP  
HINSTANCE hins; J>(X0@eWz  
void VerifyWindow(); a&>NuMDI  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) QIiy\E%  
//{{AFX_MSG_MAP(CHookApp) h0<PQZJ  
// NOTE - the ClassWizard will add and remove mapping macros here. ?^voA.Bv<  
// DO NOT EDIT what you see in these blocks of generated code! d,GOP_N8I  
//}}AFX_MSG_MAP "3^tVX%$\[  
END_MESSAGE_MAP() X['9;1Xr  
6f +aGz  
CHookApp::CHookApp() f<8Hvumw  
{ lpG%rN!  
 // TODO: add construction code here, ~N!HxQ  
 // Place all significant initialization in InitInstance k6CXuU  
} 'xH^ksb"  
`X<B+:>v-  
CHookApp theApp; >Y>R1b%  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) JP8}+  
{ Et3I(X3  
 BOOL bProcessed=FALSE; }JFTe g  
 if(HC_ACTION==nCode) t5{P'v9J  
 { @v2<T1UC  
  if((lParam&0xc0000000)==0xc0000000){// Key up EHUx~Q   
   switch(wParam) Z:9Q~}x8  
   { {R_>KE1  
    case VK_MENU: gGM fy]]R  
     MaskBits&=~ALTBIT; 6+$2rS$1V  
     break; -;9 }P  
    case VK_CONTROL: @HS*%N"*  
     MaskBits&=~CTRLBIT; *73gp  
     break; c'2/C5  
    case VK_SHIFT: l@);U%\pS  
     MaskBits&=~SHIFTBIT; ]s=|+tz\V  
     break; o-6d$c}{f  
    default: //judge the key and send message `<9>X9.+  
     break; LGt>=|=bj  
   } 4]r_K2.cc  
   for(int index=0;index<MAX_KEY;index++){ H9)@q3<  
    if(hCallWnd[index]==NULL) PCl5,]B}  
     continue; _)45G"M  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) O|H:  
    { &vrQ *jX  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); s70Z&3A  
     bProcessed=TRUE; DMUirA;  
    } +Kk1[fh-  
   } 0j@mzd2  
  } ;MN$.x+  
  else if((lParam&0xc000ffff)==1){ //Key down T >8P1p@A,  
   switch(wParam) M hN;GMH  
   { -,")GA+[7  
    case VK_MENU: t^'nh 1=  
     MaskBits|=ALTBIT; E !!,JnU  
     break; `/sNX<mp  
    case VK_CONTROL: &D3]O9a0;  
     MaskBits|=CTRLBIT; cUq]PC$|  
     break; P3"R2-  
    case VK_SHIFT: * BM|luYL  
     MaskBits|=SHIFTBIT;  Qxz[  
     break; h  /  
    default: //judge the key and send message LSta]81B4L  
     break;  w*`:v$  
   } z_>~=Mm  
   for(int index=0;index<MAX_KEY;index++) |mt W)  
   { C&z!="hMhR  
    if(hCallWnd[index]==NULL) D_lRYLA+  
     continue; ox&5} &\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 3%*igpj\)  
    { z3a GK  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); %"`p&aE:  
     bProcessed=TRUE; jt}Re,  
    } xJ3C^b%H  
   } FQ>$Ps*a[  
  } ]ogifnwv  
  if(!bProcessed){ $5pCfW8>  
   for(int index=0;index<MAX_KEY;index++){ yv-R<c!'  
    if(hCallWnd[index]==NULL) uq3pk3 )W9  
     continue; #}#m\=0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) UPH#~D!  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); /MtmO$ .  
   } [~N;d9H+*1  
  } <);q,|eh2  
 } q=t!COS  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); -jJhiaJ$<  
} VgbNZ{qk@  
^t'mW;C$4  
BOOL InitHotkey() eJoM4v  
{ h8(#\E  
 if(hHook!=NULL){ eKr>>4,-P  
  nHookCount++; KZ2[.[(Ph  
  return TRUE; 3A,N1OXG  
 } d[t0K]  
 else _s;y0$O  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Q# hRnM  
  if(hHook!=NULL) d&^b=d FDu  
   nHookCount++; P8m0]T.&x  
  return (hHook!=NULL); jV2H61d  
} Z 7@'I0;A  
BOOL UnInit() /<-PW9X?  
{ !*v% s  
 if(nHookCount>1){ OH@"]Nc~  
  nHookCount--; 44e]sT.B  
  return TRUE; k^}[+IFJ  
 } -f|/#1  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Yh95W  
 if(unhooked==TRUE){ 'bx}[  
  nHookCount=0; =b%f@x_U1  
  hHook=NULL; s:_hsmc"  
 } b%lB&}uw}  
 return unhooked; HwFg;r  
} TFkG"ev  
PzPNvV/o  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 437Wy+Q|e  
{ 9i\}^ s2  
 BOOL bAdded=FALSE; Kyh6QA^  
 for(int index=0;index<MAX_KEY;index++){ z<eu=OD4t  
  if(hCallWnd[index]==0){ K#A&  
   hCallWnd[index]=hWnd; <4TI;yy6?  
   HotKey[index]=cKey; Y @ v][Q  
   HotKeyMask[index]=cMask; 0'd@8]|H  
   bAdded=TRUE; Vs 5 &X+k  
   KeyCount++; SAnr|<Y/  
   break; 3X(^`lAf)  
  } ZSNbf|ldiE  
 } Vu(NP\Wm  
 return bAdded; 6 :4GI  
} | +;ZC y  
DG;u_6;JR  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) U,2OofLM  
{ St?mq* ,  
 BOOL bRemoved=FALSE; D:9^^uVp  
 for(int index=0;index<MAX_KEY;index++){ #<Y.+ :  
  if(hCallWnd[index]==hWnd){ Q%O9DCi  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ aX.BaK6I  
    hCallWnd[index]=NULL; KJFQ)#SW!  
    HotKey[index]=0; p>)1Z<D"a  
    HotKeyMask[index]=0; =+X*$'<J  
    bRemoved=TRUE; ;,-)Z|W  
    KeyCount--; |Kd6.Mx  
    break; @ fMlbJq  
   } vE9"1M  
  } b#I,Z+0ry  
 } '\{ OQ H  
 return bRemoved; HVvm3qu4  
} <uIPv Zsx  
oRd{?I&NY  
void VerifyWindow() >*!T`P}p  
{ @Xoh@:j\  
 for(int i=0;i<MAX_KEY;i++){ ~jw:4sG  
  if(hCallWnd!=NULL){ No\#N/1@P  
   if(!IsWindow(hCallWnd)){ (&m1*  
    hCallWnd=NULL; 5tv*uz|fv  
    HotKey=0; KeyKLkg>  
    HotKeyMask=0; 87[o^)8  
    KeyCount--; w'}s'gGE  
   } ;7Qem&  
  } xF UD9TM  
 } u&p8S#e  
} Yy 4Was#  
"a(R>PV%  
BOOL CHookApp::InitInstance() ^Whc<>|  
{ jEKa9rt  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); =pe O %  
 hins=AfxGetInstanceHandle(); 9I 6^-m@:  
 InitHotkey(); "^t7]=q  
 return CWinApp::InitInstance(); 4oF,;o+v\4  
} 2^s&#@n3t  
qbnlD\  
int CHookApp::ExitInstance() 2;]tItd1  
{ vasw@Uto)  
 VerifyWindow(); toF6 Z  
 UnInit(); 'NWvQR<X  
 return CWinApp::ExitInstance(); BfCib]V9C  
} ;\"Nekd|  
fx 08>r   
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file L,_U co  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) -C^qN7Bz  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ .~'q yD2V  
#if _MSC_VER > 1000 Ge$&k  
#pragma once yq3"VFh3d  
#endif // _MSC_VER > 1000 ?_pd#W=!  
,S(_YS^m  
class CCaptureDlg : public CDialog w}}+8mk[  
{ IAd ^$9  
 // Construction .*k!Zl*  
 public: ;2 o{ 6  
  BOOL bTray; JF &$'  
  BOOL bRegistered; k'$7RjCu  
  BOOL RegisterHotkey(); lItr*,A]  
  UCHAR cKey; 0jp y c  
  UCHAR cMask; ;F_&h#D]3  
  void DeleteIcon(); ?{Xp'D\z  
  void AddIcon(); s5 Fn("h]n  
  UINT nCount; Kc9)Lzu+  
  void SaveBmp(); o\j<EQb.  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor *=z.H  *  
  // Dialog Data |q o3 E  
  //{{AFX_DATA(CCaptureDlg) hQSJt[8My  
  enum { IDD = IDD_CAPTURE_DIALOG }; 5}N O~Xd<  
  CComboBox m_Key; Cyv_(Oh?dv  
  BOOL m_bControl; 'iYaA-9j  
  BOOL m_bAlt; 7; }TNK\+v  
  BOOL m_bShift; ku^2K   
  CString m_Path; C~iFFh6:  
  CString m_Number; b(ryk./ogx  
  //}}AFX_DATA VAxk?P0j6  
  // ClassWizard generated virtual function overrides _}Gs9sHr0K  
  //{{AFX_VIRTUAL(CCaptureDlg) RkdAzv!Y7  
 public: # 9f 4{=\  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 7Ph+Vs+h  
 protected: `Geq,  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support d\z':d .Tt  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ,Ur~DXY  
  //}}AFX_VIRTUAL {iq{<;)U?U  
  // Implementation HSl$ U0  
 protected: ]*S_fme  
  HICON m_hIcon; uuh vd h=  
  // Generated message map functions 1_W5@)  
  //{{AFX_MSG(CCaptureDlg) Qe/=(P<  
  virtual BOOL OnInitDialog(); Hi{!<e2  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); hG'2(Y!  
  afx_msg void OnPaint(); Z.LF5ur  
  afx_msg HCURSOR OnQueryDragIcon(); S67T:ARS  
  virtual void OnCancel(); a-TsD}'X  
  afx_msg void OnAbout(); zGFW?|o<  
  afx_msg void OnBrowse(); [TV"mA  
  afx_msg void OnChange(); }\ui} \  
 //}}AFX_MSG 5Q72.4HH  
 DECLARE_MESSAGE_MAP() q14A 'XW  
}; UE\@7  
#endif J2#=`|t"  
13{"sY:PT#  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file {&(bKQ  
#include "stdafx.h" ]O&A:Us  
#include "Capture.h" +ACV,GG  
#include "CaptureDlg.h" ;v+CQx  
#include <windowsx.h> OEGAwP?F  
#pragma comment(lib,"hook.lib") oB Bdk@  
#ifdef _DEBUG ELNA-ZKp  
#define new DEBUG_NEW  WU,72g=  
#undef THIS_FILE $t </{]iX  
static char THIS_FILE[] = __FILE__; {78*S R  
#endif uJp}9B60_  
#define IDM_SHELL WM_USER+1 g9"_BG  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1y8:tri>N  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 7#|NQ=yd  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Sdt2D  
class CAboutDlg : public CDialog &FvNz  
{ lB\j>.c  
 public: Y.*lO  
  CAboutDlg(); Q}Vho.N@=  
  // Dialog Data !%M-w0vC9  
  //{{AFX_DATA(CAboutDlg) 1aMBCh<}JN  
  enum { IDD = IDD_ABOUTBOX }; |QgXSe7  
  //}}AFX_DATA ;%z0iZmg  
  // ClassWizard generated virtual function overrides 0Rk'sEX,  
  //{{AFX_VIRTUAL(CAboutDlg) 01q7n`o#zf  
 protected: @%cJjZ5y  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support s3kEux^  
  //}}AFX_VIRTUAL gZ!(&u  
  // Implementation x!.VWGtb  
 protected:  FZ2-e  
  //{{AFX_MSG(CAboutDlg) (&hX8  
  //}}AFX_MSG qK1V!a2  
  DECLARE_MESSAGE_MAP() >a-+7{};  
}; /7"1\s0U  
ez5`B$$  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) z=Vvb  
{ w./EJk KI  
 //{{AFX_DATA_INIT(CAboutDlg) c`}X2u]k  
 //}}AFX_DATA_INIT 22r01qH  
} O}f(h5!k  
@ Q1jH~t  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) A07 P$3>/W  
{ +@qk=]3a  
 CDialog::DoDataExchange(pDX); ]D-48o0  
 //{{AFX_DATA_MAP(CAboutDlg) yEqmB4^-  
 //}}AFX_DATA_MAP f}'gg  
} }Voh5*$E`  
<d5vVn  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) I !<v$  
 //{{AFX_MSG_MAP(CAboutDlg) Qy/bzO  
 // No message handlers #f~a\}$I  
 //}}AFX_MSG_MAP 9G8QzIac  
END_MESSAGE_MAP() EH "g`r  
M>J ADt_]  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) t5Mo'*j =  
: CDialog(CCaptureDlg::IDD, pParent) d$,i?d,  
{ -pGt ;  
 //{{AFX_DATA_INIT(CCaptureDlg) E6@ ;e-]j  
  m_bControl = FALSE; {n{}Y.  
  m_bAlt = FALSE; dGteYt_F  
  m_bShift = FALSE; )|a9Z~#x  
  m_Path = _T("c:\\"); l=]vC +mU  
  m_Number = _T("0 picture captured."); XZ&v3ul  
  nCount=0; Yr=mLT|JN  
  bRegistered=FALSE; S7q &|nI  
  bTray=FALSE; 2!otVz! Mh  
 //}}AFX_DATA_INIT ">QY'r  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 bgK(l d`  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); rpT<cCem1  
} >oNk(. %  
Z%{f[|h9}  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) '> Q$5R1  
{ U ^9oc&  
 CDialog::DoDataExchange(pDX); +=k|(8Js#  
 //{{AFX_DATA_MAP(CCaptureDlg) l.W:6", w  
  DDX_Control(pDX, IDC_KEY, m_Key); F`Y<(]+   
  DDX_Check(pDX, IDC_CONTROL, m_bControl); KUyJ"q<W  
  DDX_Check(pDX, IDC_ALT, m_bAlt); YcV~S#b  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); (*x "6)`  
  DDX_Text(pDX, IDC_PATH, m_Path); k0IU~y%  
  DDX_Text(pDX, IDC_NUMBER, m_Number); `~]ReJ!X%  
 //}}AFX_DATA_MAP fx-*')  
} bC{8yV=)  
 :Y3?,  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) m'B6qy!}6  
//{{AFX_MSG_MAP(CCaptureDlg) K)@}Ok"#\4  
 ON_WM_SYSCOMMAND() WLl9>v^1  
 ON_WM_PAINT() j1kc&(  
 ON_WM_QUERYDRAGICON() `x VA]GR4c  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Wd5t,8*8  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) UIj/Id  
 ON_BN_CLICKED(ID_CHANGE, OnChange) dZgfls  
//}}AFX_MSG_MAP NLGr=*dq  
END_MESSAGE_MAP() !gf3%!%  
UVJ(iNK"  
BOOL CCaptureDlg::OnInitDialog() VC(|t} L4  
{ +3>4 ?,^g  
 CDialog::OnInitDialog(); %4Zy1{yKs_  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 3T/j5m}+!  
 ASSERT(IDM_ABOUTBOX < 0xF000); $\!;*SSj  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ?63JQ.;  
 if (pSysMenu != NULL) uP]o39b;V  
 { ] O>7x  
  CString strAboutMenu; A%2}?Ds  
  strAboutMenu.LoadString(IDS_ABOUTBOX); uCfp+  
  if (!strAboutMenu.IsEmpty()) sK?-@  
  { j2M(W/_  
   pSysMenu->AppendMenu(MF_SEPARATOR); rtx]dc1m  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Oha g%<1#  
  } #Vigu,zY  
 } hFfaaB  
 SetIcon(m_hIcon, TRUE); // Set big icon ! VZj!\I  
 SetIcon(m_hIcon, FALSE); // Set small icon >pvg0Fh  
 m_Key.SetCurSel(0); =3C)sz}  
 RegisterHotkey();  Zwns|23n  
 CMenu* pMenu=GetSystemMenu(FALSE); r![JPhei  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); n^02@Aw  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Ds_ "m,  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Z|% 2495\  
 return TRUE; // return TRUE unless you set the focus to a control Y`?X Fy:  
} [Mc5N  
# :w2Hf6Q  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) J6ShIPc  
{ A_~5|  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) MjC%6%HI  
 { "\r~,S{:  
  CAboutDlg dlgAbout; <SZO- -+lB  
  dlgAbout.DoModal(); XSjelA?  
 } 3og$'#6P  
 else a3O_#l-Z  
 { u/'sdt  
  CDialog::OnSysCommand(nID, lParam); _ng =5  
 } ](:FW '-  
} c|( ?  
~9{;V KgK  
void CCaptureDlg::OnPaint() >1G*ya)  
{ {taVAcb  
 if (IsIconic()) 8G] m7Z  
 { GTe:k  
  CPaintDC dc(this); // device context for painting  ca*[n~np  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); yWi0 tE{  
  // Center icon in client rectangle :qTcxzV  
  int cxIcon = GetSystemMetrics(SM_CXICON); (<ZkmIXN  
  int cyIcon = GetSystemMetrics(SM_CYICON); 1DtMY|wP  
  CRect rect; T}Vpy`  
  GetClientRect(&rect); }k0-?_Z=1  
  int x = (rect.Width() - cxIcon + 1) / 2; +JS/Z5dl+}  
  int y = (rect.Height() - cyIcon + 1) / 2; 6n\z53Mk  
  // Draw the icon kseJm+Hc  
  dc.DrawIcon(x, y, m_hIcon); _I-VWDCk  
 } \nAHpF  
 else 2 U`W[  
 { Y*cJ4hQ  
  CDialog::OnPaint(); >-5Gt  
 } SuH.lCF-g  
} M6iO8vY  
/ &D$kxz  
HCURSOR CCaptureDlg::OnQueryDragIcon() bH&)rn  
{ bTQa'y`3  
 return (HCURSOR) m_hIcon; g+ 1=5g  
} /:{_|P\  
~uR6z//%  
void CCaptureDlg::OnCancel() <-B"|u  
{ ]Bd3d%  
 if(bTray) |EV\a[  
  DeleteIcon(); !FO^:V<|5  
  CDialog::OnCancel(); #lshN,CPm  
} O& %"F8B  
pNE\@U|4E  
void CCaptureDlg::OnAbout() @ PoFxv  
{ fCf#zV[  
 CAboutDlg dlg; DwY<qNWT  
 dlg.DoModal(); ,o@~OTja*  
} 27E9NO=  
O0wCb  
void CCaptureDlg::OnBrowse() ?t0zsq  
{ ;s\;78`0  
 CString str; -N7L #a  
 BROWSEINFO bi; \btR^;_\A  
 char name[MAX_PATH]; #>m, Cm  
 ZeroMemory(&bi,sizeof(BROWSEINFO));  ;[KriW  
 bi.hwndOwner=GetSafeHwnd(); `o8{qU,*]N  
 bi.pszDisplayName=name; q X%vRf0  
 bi.lpszTitle="Select folder"; SAG` ^t  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; PL9eUy  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); fH e0W  
 if(idl==NULL) FL#g9U>  
  return; Uy59zB2|=  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); e4=FU&RpNH  
 str.ReleaseBuffer(); >PJtG]D  
 m_Path=str; {#1j"  
 if(str.GetAt(str.GetLength()-1)!='\\') ,d>X/kd|o  
  m_Path+="\\"; ?7kV+{.  
 UpdateData(FALSE); @9uYmkcV  
} g7 Md  
-<51CDw,  
void CCaptureDlg::SaveBmp() UhSh(E8p>  
{ 9U=fJrj'u  
 CDC dc; }>;ht5/i/  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); S@}B:}2  
 CBitmap bm; rI<nUy P?  
 int Width=GetSystemMetrics(SM_CXSCREEN); `o_fUOe8a  
 int Height=GetSystemMetrics(SM_CYSCREEN); c/=y*2,zo  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Y0PGT5].@'  
 CDC tdc; E +Ujpd  
 tdc.CreateCompatibleDC(&dc);  H\=LE  
 CBitmap*pOld=tdc.SelectObject(&bm); LGo2^Xx  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 6i]Nr@1C  
 tdc.SelectObject(pOld); Z[k#AgC)  
 BITMAP btm; [EmOA.6  
 bm.GetBitmap(&btm); 1J-Qh<Q   
 DWORD size=btm.bmWidthBytes*btm.bmHeight; C '-zh\a  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); L`jB)wF /J  
 BITMAPINFOHEADER bih; aI={,\  
 bih.biBitCount=btm.bmBitsPixel; $K?T=a;z  
 bih.biClrImportant=0; )pjjW"C+  
 bih.biClrUsed=0; lHcZi  
 bih.biCompression=0; WXLe,7y  
 bih.biHeight=btm.bmHeight; &R'w-0k_  
 bih.biPlanes=1; 1c)\  
 bih.biSize=sizeof(BITMAPINFOHEADER); %Ui{=920  
 bih.biSizeImage=size; %wt2F-u  
 bih.biWidth=btm.bmWidth; i5 L:L  
 bih.biXPelsPerMeter=0; Hz]4AS  
 bih.biYPelsPerMeter=0; *b Ci2mbm@  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Gpdv]SON{  
 static int filecount=0; dNUR)X#e  
 CString name; vXy uEEe  
 name.Format("pict%04d.bmp",filecount++); &\1'1`N1  
 name=m_Path+name; E[jXUOu-  
 BITMAPFILEHEADER bfh; Q(IJD4  
 bfh.bfReserved1=bfh.bfReserved2=0; R%b*EBZ  
 bfh.bfType=((WORD)('M'<< 8)|'B'); /`+Hw dk  
 bfh.bfSize=54+size; 3tT|9Tb@  
 bfh.bfOffBits=54; ` URSv,(  
 CFile bf; 8"km_[JE e  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ c$Xe.:QY  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); (VYR!(17  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 9Hf*cQ  
  bf.WriteHuge(lpData,size); cW)Oi^q%o2  
  bf.Close(); NZo<IKD$  
  nCount++; oe(9mYWKa6  
 } t1e4H=d>  
 GlobalFreePtr(lpData); 5c: '>  
 if(nCount==1) IjG5X[@  
  m_Number.Format("%d picture captured.",nCount); 1mJbQ#5  
 else tS\=<T  
  m_Number.Format("%d pictures captured.",nCount); ZjU=~)O}H  
  UpdateData(FALSE); x7 "z(rKl  
} wv, GBZ-f  
(TEo_BW|+  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 87^:<\pp  
{ \npz .g^c_  
 if(pMsg -> message == WM_KEYDOWN) W\it+/  
 { ;".z[l*  
  if(pMsg -> wParam == VK_ESCAPE) F2IC$:e M  
   return TRUE; 8yE!7$Mj  
  if(pMsg -> wParam == VK_RETURN) l60ikc4$I  
   return TRUE; g!1I21M1~  
 } \f(Y:}9  
 return CDialog::PreTranslateMessage(pMsg); G*i.a*9<)  
} ?SC3Vzr  
uu}a:qrY  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 1P_Fe[8  
{  5ZnSA9?  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ O6yP qG*j  
  SaveBmp(); $d'CBsu|<  
  return FALSE; {]&R8?%  
} JAc@S20v\  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ .Qd}.EG  
 CMenu pop; DVObrL)znL  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); S?*^>Y-e;  
 CMenu*pMenu=pop.GetSubMenu(0); MWBXs7 5I  
 pMenu->SetDefaultItem(ID_EXITICON); xME(B@j  
 CPoint pt; qE>i,|rP`  
 GetCursorPos(&pt); {bN Y  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 6 -]>]Hr-  
 if(id==ID_EXITICON) za,6 du6  
  DeleteIcon(); fC_zX}3  
 else if(id==ID_EXIT) #hIEEkCp +  
  OnCancel(); &oA~ Tx  
 return FALSE; G9\EZ\x!  
} X(IyvfC  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); D899gGe  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 43KaL(  
 AddIcon(); +Dv7:x7  
 return res; !0`lu_ZN  
} vx'l> @]k  
#`/bQ~s  
void CCaptureDlg::AddIcon() }A-{6Qe  
{ f[x~)=  
 NOTIFYICONDATA data; V {p*z  
 data.cbSize=sizeof(NOTIFYICONDATA); x@h tx?   
 CString tip; J;S-+  
 tip.LoadString(IDS_ICONTIP); (FuEd11R  
 data.hIcon=GetIcon(0); W+KF2(lB  
 data.hWnd=GetSafeHwnd(); +|6`E3j%  
 strcpy(data.szTip,tip); O{~KR/  
 data.uCallbackMessage=IDM_SHELL; Fav?,Q,n  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; FtE90=$  
 data.uID=98; ^Sw2xT$p{j  
 Shell_NotifyIcon(NIM_ADD,&data); \H^;'agA  
 ShowWindow(SW_HIDE); veV_be{i  
 bTray=TRUE; oWI!u 5  
} (}G!np  
Ddb-@YD&+0  
void CCaptureDlg::DeleteIcon() ?fV?|ZGZI  
{ {o( * f  
 NOTIFYICONDATA data; G(3;;F7"  
 data.cbSize=sizeof(NOTIFYICONDATA); /^Y[*5  
 data.hWnd=GetSafeHwnd(); GjEqU;XBi  
 data.uID=98; G%;kGi`m  
 Shell_NotifyIcon(NIM_DELETE,&data); IAYACmlN&  
 ShowWindow(SW_SHOW); n[|6khOL-  
 SetForegroundWindow(); $|k%@Q>  
 ShowWindow(SW_SHOWNORMAL); 975 _d_U  
 bTray=FALSE; xpAok]  
} ^CUSlnB\(  
)#a7'Ba  
void CCaptureDlg::OnChange() }B`Ku5 M  
{ WVOoHH  
 RegisterHotkey(); P7Xg{L&@.  
} "v5ElYG  
CI^[I\$&  
BOOL CCaptureDlg::RegisterHotkey() \0nlPXk?G  
{ })P O7:  
 UpdateData(); d .p'pGL  
 UCHAR mask=0; 88+ =F XG  
 UCHAR key=0; =5?.'XMk  
 if(m_bControl) `%Q&</X  
  mask|=4; 6AAswz'$P  
 if(m_bAlt) F_ 81l<  
  mask|=2; U9 bWU'  
 if(m_bShift) 33 : @*  
  mask|=1; okstY4f'  
  key=Key_Table[m_Key.GetCurSel()]; "Kq>#I'%W  
 if(bRegistered){ FI$XSG  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); g rspt}  
  bRegistered=FALSE; `"c'z;  
 } `;$h'eI9  
 cMask=mask; ->h5T%sn  
 cKey=key; h,t:]  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); P3!Atnv2  
 return bRegistered; z6I%wh  
} Cc Y7$D  
NO2(vE  
  四、小结 Vc _:*  
W qE '(  
  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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