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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: lK/4"&  
  @=P c{xp  
  一、实现方法 v FQ]>n X  
o/ 51 RH  
  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:  AV|:v3  
{X2uFw Gi  
#pragma data_seg("shareddata") {>vgtkJ  
HHOOK hHook =NULL; //钩子句柄 ]@cI_n  
UINT nHookCount =0; //挂接的程序数目 ZvQZD=,F  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 7Y-Q, ?1  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 w0@XJH:P  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey #g@4c3um|  
static int KeyCount =0; >TM{2b,(p  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 [O'aka Q  
#pragma data_seg() >Ik%_:CC`  
_-H,S)kI`  
  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。 Vt \g9-[  
=jh^mD&'  
  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: Mv/ SU">F  
sr[[xzL  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ?D7zty+}^  
cKey,UCHAR cMask) 8+7*> FD)1  
{ RTvOaZ  
 BOOL bAdded=FALSE; (e~9T MY  
 for(int index=0;index<MAX_KEY;index++){ |OAiHSW"V  
  if(hCallWnd[index]==0){ &hI!0DixX  
   hCallWnd[index]=hWnd; ~|, "w90  
   HotKey[index]=cKey; 6AdUlPM  
   HotKeyMask[index]=cMask; x5xMr.vm  
   bAdded=TRUE; {S-M]LE  
   KeyCount++; Im-qGB0C  
   break; K:qc "Q=C  
  } pzjNi=vhd  
 } 8kSyT'k C%  
 return bAdded; ]8OmYU%6V  
} Ake l.&  
//删除热键 <KtL,a=2+  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 0FH.=   
{ hP{+`\&<f  
 BOOL bRemoved=FALSE; Il>o60u1  
 for(int index=0;index<MAX_KEY;index++){ 0~_I9|FN  
  if(hCallWnd[index]==hWnd){ N"RPCd_  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ XYD-5pG  
    hCallWnd[index]=NULL; J#j3?qrxu  
    HotKey[index]=0; <Piq?&VX[  
    HotKeyMask[index]=0; ZybfqBTD&c  
    bRemoved=TRUE; v5e*R8/  
    KeyCount--; TG8U=9qt  
    break; m5] a  
   } 6&6dd_K(  
  } {|OXiRm'  
 } S76MY&Vx23  
 return bRemoved; YM NLn9  
} -Vb5d!(  
v8'XchJ  
.}eM"Kv  
  DLL中的钩子函数如下: [~cz| C#  
K0o${%'@7  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) wpC .!T  
{ +_vf=d  
 BOOL bProcessed=FALSE; =zrfh-lwH  
 if(HC_ACTION==nCode) @c"s6h&  
 { c;(Fz^&_  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 $%ND5uK  
   switch(wParam) vA Z kT"  
   {  @].!}tz  
    case VK_MENU: \ kY:|T  
     MaskBits&=~ALTBIT; z{PPPFk4J  
     break; }X=c|]6i^  
    case VK_CONTROL: #PPHxh*S  
     MaskBits&=~CTRLBIT; U|.r -$|5P  
     break; EBk-qd a}  
    case VK_SHIFT: 'r_Fi5[q  
     MaskBits&=~SHIFTBIT; 7@e}rh?N-|  
     break; ;o;ak.dTt  
    default: //judge the key and send message [euR<i*I#  
     break; 9mn~57`y  
   } 1 |) CQ  
   for(int index=0;index<MAX_KEY;index++){ l O*  
    if(hCallWnd[index]==NULL) (M u;U!M"P  
     continue; = \oW {?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9C Ki$L  
    { ~@QAa (P.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); "|Yy "iB[  
     bProcessed=TRUE; 5A 5t  
    } -#G>`T~  
   } _\,lv \u  
  } [h&s<<# D  
  else if((lParam&0xc000ffff)==1){ //有键按下 c=?6`m,"M  
   switch(wParam) z?VjlA(X  
   { YwZx{%f  
    case VK_MENU: 2u5\tp?8  
     MaskBits|=ALTBIT; L:?Ew9Lf  
     break; E;'{qp  
    case VK_CONTROL: *}Gys/\!S  
     MaskBits|=CTRLBIT; pXBh^  
     break; agruS'c g  
    case VK_SHIFT: `(P71T  
     MaskBits|=SHIFTBIT; *:un+k  
     break; *<[\|L:#]Z  
    default: //judge the key and send message UQYHR+  
     break; Slv:CM M  
   } `)KGajB  
   for(int index=0;index<MAX_KEY;index++){ MF*4E9Ue.  
    if(hCallWnd[index]==NULL) L\bc R  
     continue; (n2_HePE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 3,*A VcQA  
    { vd$>nJ"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); r~oUln<[  
     bProcessed=TRUE; ?8< =.,r  
    } I 0x;rP  
   } ]:T:cO0_n  
  } y@2"[fo3~  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 KyP@ hhj  
   for(int index=0;index<MAX_KEY;index++){ +;pw^QB  
    if(hCallWnd[index]==NULL) q@VIFmqY!  
     continue; nox-)e  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) saQo]6#  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); vgg)f~  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 aCIz(3^  
   } dNqj|Vu  
  } :ec>[N~KG  
 } 3A~<|<}t  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); i$ hWX4L  
} QR~4Fe  
n+<  
  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: ,VUOsNN4\  
KIWHn_ :  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); -*ZQ=nomN  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); #SI]^T|  
E&L ml?@  
  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: HB*BL+S06  
DR]oK_  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) d$E>bo-\   
{ X>o*eN  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) >){}nlQf  
 { v6! `H  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 -!M>;M@  
  SaveBmp(); Ik A~+6UY  
  return FALSE; W>&*.3{v  
 } 6L Fhhl^  
 …… //其它处理及默认处理 Uqj$itqUQ  
}  => Qd  
i=rA;2>  
83#<Yxk~  
  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。 | "M1+(k7  
Ytqx 0  
  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。 i*&b@.7N  
)u]=^  
  二、编程步骤 zJUT<%[U  
$`vXI%|.  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; m@L>6;*  
If'N0^'W  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 1E4`&?  
GN5*  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; %=s2>vv9  
B !rb*"[  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; "^ dMCS@  
^AZv4H*~  
  5、 添加代码,编译运行程序。 N6S@e\*  
pRsIi_~&  
三、程序代码 R@>^t4#_Q0  
^)|tf\4  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL !Bg^-F:N  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ":=h1AJY  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ NQiu>Sg  
#if _MSC_VER > 1000  zNn  
#pragma once ?LvU7  
#endif // _MSC_VER > 1000 +J A\by  
#ifndef __AFXWIN_H__ XC}2GHO<  
#error include 'stdafx.h' before including this file for PCH Y q|OX<i`K  
#endif H xc>?  
#include "resource.h" // main symbols `m"K_\w=/  
class CHookApp : public CWinApp DM\pi9<m  
{  ggfCfn  
 public: @cx#'  
  CHookApp(); heb{i5el  
  // Overrides !V4(- 8  
  // ClassWizard generated virtual function overrides 5RY-.c4}  
  //{{AFX_VIRTUAL(CHookApp) i`}9VaUG  
 public: 7<2^8 `  
  virtual BOOL InitInstance(); F`Z?$ 1  
  virtual int ExitInstance(); ,#0#1k<Dm  
  //}}AFX_VIRTUAL S~|\bnE  
  //{{AFX_MSG(CHookApp) #W_-S0>&  
  // NOTE - the ClassWizard will add and remove member functions here. dww4o~hO  
  // DO NOT EDIT what you see in these blocks of generated code ! FS!vnl8`  
  //}}AFX_MSG 2<AQ{ c  
  DECLARE_MESSAGE_MAP() ew c:-2Y^  
}; oJE<}~_k  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); &a\G,Ma  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); :Z83*SPc  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); z$/s` |]  
BOOL InitHotkey(); kaECjZ _&+  
BOOL UnInit(); lX 50JJwk  
#endif G \$x.  
;xai JJK{  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ^0I"  
#include "stdafx.h" fX1Ib$v  
#include "hook.h" `bLJ wJ7  
#include <windowsx.h> 9 "M-nH*<  
#ifdef _DEBUG G%}k_vi&q  
#define new DEBUG_NEW .+lx}#-#  
#undef THIS_FILE V-63   
static char THIS_FILE[] = __FILE__; aHitPPlq  
#endif oXVx9dZ  
#define MAX_KEY 100 i"4;{C{s  
#define CTRLBIT 0x04 uFvR(LDb&g  
#define ALTBIT 0x02 .i#'IS0c  
#define SHIFTBIT 0x01 ]&='E.f  
#pragma data_seg("shareddata") e_S,N0  
HHOOK hHook =NULL; %qVD-Jln  
UINT nHookCount =0; mMCd   
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ScT{Tb]9bt  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ezm*9Jc~p  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey N6*FlG-  
static int KeyCount =0; dtV7YPz4+  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift oGt2n:  
#pragma data_seg() 25W #mh,'  
HINSTANCE hins; 2';{o=TXV  
void VerifyWindow(); >I+p;V$@  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 7WNUHLEt  
//{{AFX_MSG_MAP(CHookApp) Jr(Z Ym'  
// NOTE - the ClassWizard will add and remove mapping macros here. @v\8+0  
// DO NOT EDIT what you see in these blocks of generated code! ArT@BqWd  
//}}AFX_MSG_MAP .rlLt5b%  
END_MESSAGE_MAP() "5\6`\/  
}/L#<n`Z  
CHookApp::CHookApp() nH+wU;M  
{ 8>I4e5Ym  
 // TODO: add construction code here, od&wfwk(  
 // Place all significant initialization in InitInstance dI%Nwl%  
} _.m|Ml,`{  
D'UIxc8  
CHookApp theApp; [mG!-.ll  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) :"K9(XKKU  
{ ,OMdLXr  
 BOOL bProcessed=FALSE; 4 *. O%  
 if(HC_ACTION==nCode) JE eXoGKd  
 { 7H,)heA  
  if((lParam&0xc0000000)==0xc0000000){// Key up d^5x@E_Td  
   switch(wParam) $+U 6c~^^  
   { A5s;<d0  
    case VK_MENU: F84<='K  
     MaskBits&=~ALTBIT; tU.~7f#+A  
     break; {]4Zpev  
    case VK_CONTROL: OgzKX>N`A  
     MaskBits&=~CTRLBIT; ;):E 8;B)  
     break; Xhpcu1nA  
    case VK_SHIFT: ~L_1&q^4!i  
     MaskBits&=~SHIFTBIT; aR)w~s\6  
     break; (De>k8  
    default: //judge the key and send message 3/,}&SX  
     break; #w!ewCvt  
   } zXId up@  
   for(int index=0;index<MAX_KEY;index++){ =8Z-ORW51  
    if(hCallWnd[index]==NULL) \[A JWyP  
     continue; }E&:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) X7*fmD=Uy  
    { =9:gW5F69  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Jpn= ^f[rm  
     bProcessed=TRUE; 8RcLs1n/  
    } L=I;0Ip9y  
   } 2~yj =D27Z  
  } rG%8ugap  
  else if((lParam&0xc000ffff)==1){ //Key down ZT<VDcP{  
   switch(wParam) ]i>,oxBWe  
   { (543`dqAmC  
    case VK_MENU: c1 j@*6B  
     MaskBits|=ALTBIT; G4\|bwh  
     break; NLt"yD3t  
    case VK_CONTROL:  y&wo"';  
     MaskBits|=CTRLBIT; q7I(x_y /  
     break; ,@zw  
    case VK_SHIFT: ,}l|_GGj  
     MaskBits|=SHIFTBIT; 2g5jGe*0  
     break; n.G.f bO  
    default: //judge the key and send message nL]eGC  
     break; 6$H`wDh#(&  
   } &_\;p-1:  
   for(int index=0;index<MAX_KEY;index++) m;ju@5X  
   { R_ )PbFw  
    if(hCallWnd[index]==NULL) m!3D5z]n9  
     continue; uF[~YJ>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))  +&<k}Mz  
    { 7zowvE?#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 60WlC0Y~u  
     bProcessed=TRUE; fk\]wFj  
    } ONF x -U]  
   } mRxeob  
  } tY#Zl 54~{  
  if(!bProcessed){ `w)yR>lqh  
   for(int index=0;index<MAX_KEY;index++){ XI,=W  
    if(hCallWnd[index]==NULL) CQ7NQ^3k  
     continue; 6lUC$B Y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 7/)0{B4U'  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); =JxEM7r  
   } J.]`l\  
  }  %Nx,ZD@  
 } ``>z8t[ks  
 return CallNextHookEx( hHook, nCode, wParam, lParam );   Xi w  
} Ny2bMj.o  
U6YHq2<  
BOOL InitHotkey() \$gA2r  
{ =>@ X+4Kb  
 if(hHook!=NULL){ 8T Tj<T!N  
  nHookCount++; e2L>"/  
  return TRUE; PO ,zP9  
 } 3r[ s_Y*  
 else Ve<f}  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); U(%6ny  
  if(hHook!=NULL) ^UFNds'q  
   nHookCount++; {~XAg~  
  return (hHook!=NULL); 2#s8Dxt  
} U U#tm  
BOOL UnInit() VH vL:z  
{ [p]UM;+  
 if(nHookCount>1){ }nSu7)3$B  
  nHookCount--; L^K,YlNBR  
  return TRUE; bgkBgugZhX  
 } 3Zwhv+CP[  
 BOOL unhooked = UnhookWindowsHookEx(hHook); _9?v?mL5;  
 if(unhooked==TRUE){ 5f2=`C0_  
  nHookCount=0; }'Ph^ %ox  
  hHook=NULL; OLoo#HW  
 } nQ{~D5y,,  
 return unhooked; ^AERGB\36  
} .kJu17!  
>;%LW} %  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) J|VDZ# c7  
{ Y' 5X4Ks|  
 BOOL bAdded=FALSE; >~tx8aI{  
 for(int index=0;index<MAX_KEY;index++){ n'%cO]nSx  
  if(hCallWnd[index]==0){ dV-6l6  
   hCallWnd[index]=hWnd; ,bP8"|e  
   HotKey[index]=cKey; {XwDvLZ  
   HotKeyMask[index]=cMask; ({D>(xN   
   bAdded=TRUE; 6P)DM  
   KeyCount++; ,k(B>O~o  
   break; fUZCP*7>  
  } _rz\[{)  
 } 8G3.bi'q   
 return bAdded; )}Cf6 m}  
} yw1Xxwc  
'$5d6?BC`3  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) }g:'K  
{ ?[%.4i;-h  
 BOOL bRemoved=FALSE; @q{.  
 for(int index=0;index<MAX_KEY;index++){ ,uO_C(G/i  
  if(hCallWnd[index]==hWnd){ MPYYTQ1FB  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ _xnJfW_  
    hCallWnd[index]=NULL; ?~cO\(TY["  
    HotKey[index]=0; 6X$nZM|g,  
    HotKeyMask[index]=0; {\|XuCF#  
    bRemoved=TRUE; fuWAw^&  
    KeyCount--; vFeR)Ox's  
    break; Pon0(:#1  
   } ;alt%:$n  
  } KIKIag#  
 } ^==Tv+T9U  
 return bRemoved; JOs kf(  
} {wO .nOB  
<vu~EY0.  
void VerifyWindow() `, 4YPjk^  
{ 2EO9IxIf  
 for(int i=0;i<MAX_KEY;i++){ ce719n$   
  if(hCallWnd!=NULL){ Z Z c^~  
   if(!IsWindow(hCallWnd)){ ;";>7k/}  
    hCallWnd=NULL; j)Z0K$z=  
    HotKey=0; >t.PU.OM  
    HotKeyMask=0; ,mz7!c9H^a  
    KeyCount--; "hZ `^ "0b  
   } 9NZq k  
  } $_e{Zv[  
 } rA @|nL{  
} jR*iA3LDo  
q6x}\$mL  
BOOL CHookApp::InitInstance() :`0,f?cE  
{ @ ]42.oP  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 8: uh0  
 hins=AfxGetInstanceHandle(); )QmmI[,tq  
 InitHotkey(); K9 K.mGYc  
 return CWinApp::InitInstance(); XXQC`%-]<i  
} ' -aLBAxy  
TGjxy1A  
int CHookApp::ExitInstance() XjYMp3  
{ n"Jj'8k  
 VerifyWindow(); hqwsgJ  
 UnInit(); wzZ]| C(vp  
 return CWinApp::ExitInstance(); YfNN&G4_  
} Iv{iJoe;UH  
QD1&"T<.d.  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file IWwOP{ <ZQ  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) t{B6W)q  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ F>E_d<m  
#if _MSC_VER > 1000 brL u~]I  
#pragma once {nS(B  
#endif // _MSC_VER > 1000 RusiCo!r  
D>`{f4Y  
class CCaptureDlg : public CDialog w2^s}NO  
{ C[+?gQJ[9  
 // Construction VRHS 4  
 public: x_l8&RIB*  
  BOOL bTray; nppSrj?  
  BOOL bRegistered; Svs&?B\}{6  
  BOOL RegisterHotkey(); R1.Yx?  
  UCHAR cKey; 8-smL^~%#  
  UCHAR cMask; y;O 6q206  
  void DeleteIcon(); 49Y:}<Yd   
  void AddIcon(); Lf{pTxKr  
  UINT nCount; h,]lN'JG{  
  void SaveBmp(); =YtK@+| i  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor a(h@4 x  
  // Dialog Data LOgB_$9_3  
  //{{AFX_DATA(CCaptureDlg) UA#=K+2  
  enum { IDD = IDD_CAPTURE_DIALOG }; `eGp.[ffT  
  CComboBox m_Key; jASK!3pY  
  BOOL m_bControl; NVDIuh  
  BOOL m_bAlt; g26 l:1P  
  BOOL m_bShift; j}8^gz]  
  CString m_Path; }Fu2%L>  
  CString m_Number; t=[/L]!  
  //}}AFX_DATA QEmktc1 7  
  // ClassWizard generated virtual function overrides E#kH>q@K`$  
  //{{AFX_VIRTUAL(CCaptureDlg) 5F :\U  
 public: qzk]9`i1:  
  virtual BOOL PreTranslateMessage(MSG* pMsg); dO-Zj#%7z8  
 protected: dtXtZ!g2  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support s GrI%3[e"  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); (8em5  
  //}}AFX_VIRTUAL 9AD0|,g  
  // Implementation ?w)A`G_  
 protected: i_I`  
  HICON m_hIcon; 475jmQ{q  
  // Generated message map functions J.0&gP V  
  //{{AFX_MSG(CCaptureDlg) TJ,?C$3  
  virtual BOOL OnInitDialog(); F[fs^Q6S$  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Kke _?/fT  
  afx_msg void OnPaint(); LD,T$"  
  afx_msg HCURSOR OnQueryDragIcon(); E,4*a5Fi  
  virtual void OnCancel(); }E)t,T>  
  afx_msg void OnAbout(); }5X.*wz  
  afx_msg void OnBrowse(); >PGsY[N  
  afx_msg void OnChange(); YT@H^=  
 //}}AFX_MSG rPHM_fW(O@  
 DECLARE_MESSAGE_MAP() fo I:`]2"*  
}; V0gu0+u~R  
#endif Pfm B{  
lI5>d(6p  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file rhN"#?  
#include "stdafx.h" / ]nrxT  
#include "Capture.h" :[Ie0[H/M  
#include "CaptureDlg.h" #;"lBqxY`  
#include <windowsx.h> mUiJ@  
#pragma comment(lib,"hook.lib") (k%r_O6  
#ifdef _DEBUG pU u')y  
#define new DEBUG_NEW D P:}<  
#undef THIS_FILE %\%&1  
static char THIS_FILE[] = __FILE__; 4&~*;an7  
#endif c>C!vAg  
#define IDM_SHELL WM_USER+1 \<b42\a}  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); dBW4%Zh  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); BkDq9>  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; L-e6^%eU  
class CAboutDlg : public CDialog vNU[K%U  
{ fqol-{F.V  
 public: Ft>,  
  CAboutDlg(); AgdU@&^  
  // Dialog Data ulk yP  
  //{{AFX_DATA(CAboutDlg) zG&yu0;D6  
  enum { IDD = IDD_ABOUTBOX }; u 0 K1n_  
  //}}AFX_DATA QW%xwV?8  
  // ClassWizard generated virtual function overrides QX9['B<  
  //{{AFX_VIRTUAL(CAboutDlg) 6 %T_;"hb  
 protected: "3?:,$*  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support k:1|Z+CJ  
  //}}AFX_VIRTUAL _%aT3C}k  
  // Implementation A{52T]9X  
 protected: 9O:-q[K**  
  //{{AFX_MSG(CAboutDlg) 5)M#hx%]#  
  //}}AFX_MSG o^BX:\}  
  DECLARE_MESSAGE_MAP() Vb~;"WABo  
}; VO*fC  
]Vf2Mn=]"  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) SLud}|f;o  
{ 9cMMkOM J  
 //{{AFX_DATA_INIT(CAboutDlg) Ude)$PAe%  
 //}}AFX_DATA_INIT P;e@<O  
} m] @o1J  
TI3@/SB>  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Q!W+vh  
{ =5h ,ZB2A  
 CDialog::DoDataExchange(pDX); M,P:<-J  
 //{{AFX_DATA_MAP(CAboutDlg) hQDl&A  
 //}}AFX_DATA_MAP R"QWap}  
} rVnolA*%  
<P c;8[  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) mmEe@-lE  
 //{{AFX_MSG_MAP(CAboutDlg) ~G~:R  
 // No message handlers X!]p8Q y  
 //}}AFX_MSG_MAP @z(s\T  
END_MESSAGE_MAP() vslN([@JR  
iIg99c7/&9  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ?yvjX90  
: CDialog(CCaptureDlg::IDD, pParent) 6x! q  
{ q.p.y0  
 //{{AFX_DATA_INIT(CCaptureDlg) ,j\UZ  
  m_bControl = FALSE; .A <n2-  
  m_bAlt = FALSE; ;<|m0>X  
  m_bShift = FALSE; /k^O1+]H  
  m_Path = _T("c:\\"); Y; q['h  
  m_Number = _T("0 picture captured."); $C6O<A  
  nCount=0; ,wk %)^  
  bRegistered=FALSE; >2< Jb!f&  
  bTray=FALSE; 0bR})}a+Yg  
 //}}AFX_DATA_INIT :FI 4GR*?  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 X FvPc  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 5E\&O%W"  
} ixo?o]Xb`  
Qx[ nR/  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) `z`"0;,7S  
{ ]WC@*3'kye  
 CDialog::DoDataExchange(pDX); j;i7.B"[  
 //{{AFX_DATA_MAP(CCaptureDlg) 0'^zIL#.  
  DDX_Control(pDX, IDC_KEY, m_Key); V?Ye^ -29  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); K#'{Ko  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 8'Bik  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); {;Y2O.lV  
  DDX_Text(pDX, IDC_PATH, m_Path);  =u Ieur  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Pb@9<NXm'  
 //}}AFX_DATA_MAP KEvT."t  
} \g\,  
Twr<MXa  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ~,P."  
//{{AFX_MSG_MAP(CCaptureDlg) wLH[rwPr  
 ON_WM_SYSCOMMAND() !4!Y~7sI"\  
 ON_WM_PAINT() \Y}nehxG@  
 ON_WM_QUERYDRAGICON() /g]m,Y{OI  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) o_ SR  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) u6u1>  
 ON_BN_CLICKED(ID_CHANGE, OnChange) fk:oCPo  
//}}AFX_MSG_MAP Q::6|B,G  
END_MESSAGE_MAP() }\)O1  
]!04L}hy|P  
BOOL CCaptureDlg::OnInitDialog() i.*Utm`1"e  
{ qUF}rl S=r  
 CDialog::OnInitDialog(); iKuSk~  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); bZ*J]1y(.  
 ASSERT(IDM_ABOUTBOX < 0xF000); L;k9}HWpP  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 0 6S-3bis  
 if (pSysMenu != NULL) N6_<[`  
 { A!j6JY.w  
  CString strAboutMenu; I^fKZ^]8P  
  strAboutMenu.LoadString(IDS_ABOUTBOX); QBfsdu<@^  
  if (!strAboutMenu.IsEmpty()) kkE1CHY  
  { 7tr;adjs  
   pSysMenu->AppendMenu(MF_SEPARATOR); c_^-`7g  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 9hIcnPu  
  } ~Fd<d[b?  
 } eZ~ZWb,%  
 SetIcon(m_hIcon, TRUE); // Set big icon ?Wm.'S'to  
 SetIcon(m_hIcon, FALSE); // Set small icon ?-IjaDC}  
 m_Key.SetCurSel(0); 'X(G><R9  
 RegisterHotkey(); geRD2`3;  
 CMenu* pMenu=GetSystemMenu(FALSE); .I&]G  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); _4jRUsvjY  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); @I^LmB9*  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); <kr%ylhIu  
 return TRUE; // return TRUE unless you set the focus to a control rwUKg[ 1N  
} 2,O;<9au<  
MH,vn</Uw  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) @ \(*pa  
{ Dk XB  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) RwC1C(ZP  
 { #(G#O1+  
  CAboutDlg dlgAbout; LE:nmo  
  dlgAbout.DoModal(); kmXaLt2Z  
 } .oFkx*Ln  
 else Cp 2$I<T  
 { @< @\CiM  
  CDialog::OnSysCommand(nID, lParam); ^q0Ox&X  
 } $pm5G} .  
} [LJ1wBMw  
T};fy+iq  
void CCaptureDlg::OnPaint() E#=slj @  
{ r!vSYgee  
 if (IsIconic()) `kd P)lI `  
 { 7TjK;w7xS.  
  CPaintDC dc(this); // device context for painting 7#BpGQJQ  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); hw [G  
  // Center icon in client rectangle K2glkGK  
  int cxIcon = GetSystemMetrics(SM_CXICON); _pv<_ Sm  
  int cyIcon = GetSystemMetrics(SM_CYICON); R8 lBh Ls  
  CRect rect; E|jbbCZy2  
  GetClientRect(&rect);  v NJ!d  
  int x = (rect.Width() - cxIcon + 1) / 2; ta-kqt!'  
  int y = (rect.Height() - cyIcon + 1) / 2; jJF(*D  
  // Draw the icon Qr4c':8  
  dc.DrawIcon(x, y, m_hIcon); ^Fr82rJs  
 } W=$d|*$  
 else tNI~<#+lg  
 { p Rn vd|  
  CDialog::OnPaint(); pZ,P_?  
 } *hp3w  
} W:^\Oe5&a  
%usy`4 2  
HCURSOR CCaptureDlg::OnQueryDragIcon() jz_\B(m9%  
{ mG!Rh  
 return (HCURSOR) m_hIcon; $DOBC@xxzT  
} [C]u!\(IF  
=*aun&  
void CCaptureDlg::OnCancel() #lM :BO  
{ >d&_e[j  
 if(bTray) B|-E3v:f 4  
  DeleteIcon(); IZV D.1  
  CDialog::OnCancel(); .OHjn|  
} {VPF2JFB[  
h4 s!VK1X  
void CCaptureDlg::OnAbout() ZCZYgf@  
{ mRT`'fxK  
 CAboutDlg dlg; +IiL(\ew  
 dlg.DoModal(); TM8WaH   
} t7#C&B  
8lo /BGxS>  
void CCaptureDlg::OnBrowse() {]aB3  
{ &n.7~C]R  
 CString str; [WDtr8L  
 BROWSEINFO bi; I |?zSFa  
 char name[MAX_PATH]; X#$mBRK7  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ,nJYYM   
 bi.hwndOwner=GetSafeHwnd(); !biq7f%6#  
 bi.pszDisplayName=name; <j93   
 bi.lpszTitle="Select folder"; dHnR)[?e  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ON{&-  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ceDe!Iu  
 if(idl==NULL) H=OKm  
  return;  xA DjQ%B  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); .R/`Y)4  
 str.ReleaseBuffer(); ?3wEO>u  
 m_Path=str; URq{#,~CT  
 if(str.GetAt(str.GetLength()-1)!='\\') HY.?? 5MH  
  m_Path+="\\"; L=u>}?!,Fj  
 UpdateData(FALSE); OchIEF "N  
} 72qbxPY13h  
f>Mg.9gJ(  
void CCaptureDlg::SaveBmp() 51Yq>'8  
{ yp=(wcJ  
 CDC dc; D&f(h][hH?  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); }4PIpDL  
 CBitmap bm; }| BnG"8  
 int Width=GetSystemMetrics(SM_CXSCREEN); xeqAFq=9?  
 int Height=GetSystemMetrics(SM_CYSCREEN); 3"HpM\A{A=  
 bm.CreateCompatibleBitmap(&dc,Width,Height); m"P"iK/Av(  
 CDC tdc; 5Uc!;Gd?b  
 tdc.CreateCompatibleDC(&dc); rULrGoM  
 CBitmap*pOld=tdc.SelectObject(&bm); w\ U fq  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); }VlX!/42  
 tdc.SelectObject(pOld); Yl[GO}M  
 BITMAP btm; ALqP;/  
 bm.GetBitmap(&btm); V#:`:-$$+  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; {c|=L@/  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); %a;N)1/  
 BITMAPINFOHEADER bih; !JtVp&?  
 bih.biBitCount=btm.bmBitsPixel; x?0ZzB),  
 bih.biClrImportant=0; s)dN.'5/  
 bih.biClrUsed=0; Aen)r@Y:  
 bih.biCompression=0; 9S ~!!7oj  
 bih.biHeight=btm.bmHeight; )x1LOMe  
 bih.biPlanes=1; A ^YHtJ  
 bih.biSize=sizeof(BITMAPINFOHEADER); DGMvYNKTj  
 bih.biSizeImage=size; %UuV^C  
 bih.biWidth=btm.bmWidth; XOQj?Q7)U  
 bih.biXPelsPerMeter=0; d Ybb>rlu  
 bih.biYPelsPerMeter=0; ^lCys  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); x4jn45]x@  
 static int filecount=0; \8%64ZL`  
 CString name; zfDx c3e  
 name.Format("pict%04d.bmp",filecount++); J>(I"K%  
 name=m_Path+name; <S'5`-&  
 BITMAPFILEHEADER bfh; L 0?-W%$>  
 bfh.bfReserved1=bfh.bfReserved2=0; L Of0_g/  
 bfh.bfType=((WORD)('M'<< 8)|'B'); f S50  
 bfh.bfSize=54+size; 9ZjSM,+  
 bfh.bfOffBits=54; `<>Emc8Z  
 CFile bf; irSdqa/  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 7@R;lOzL3  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); !ydJ{\;  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); l$$N~FN  
  bf.WriteHuge(lpData,size); VU7x w  
  bf.Close(); k H Y  
  nCount++; ]+O];*T  
 } e;:~@cB,c  
 GlobalFreePtr(lpData); ", b}-B  
 if(nCount==1) &K@2kq,  
  m_Number.Format("%d picture captured.",nCount); DN)Ehd.  
 else SV;S`\i  
  m_Number.Format("%d pictures captured.",nCount); LJK<Xen  
  UpdateData(FALSE); ngM>Tzirt  
} W)I)QinOH  
&]gw[ `  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) v=15pW  
{ Ky33h 0TX  
 if(pMsg -> message == WM_KEYDOWN) y>T:fu  
 { b_xn80O  
  if(pMsg -> wParam == VK_ESCAPE) pj.}VF!d  
   return TRUE; wjGD[~mB  
  if(pMsg -> wParam == VK_RETURN) 1A;>@4iC0  
   return TRUE; ;C=C`$Q  
 } |,c\R"8xS  
 return CDialog::PreTranslateMessage(pMsg); :d7Ju.*J  
} `N%q^f~  
VmM?KlC  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) #8P9}WTno.  
{ d4h1#MK  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ n!5 :I#B  
  SaveBmp(); ]t-_.E )F  
  return FALSE; {] 1+01vI-  
} 4:Adn?"  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ `!<RP'  
 CMenu pop; %dMq'j  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 0q`n]NM  
 CMenu*pMenu=pop.GetSubMenu(0); <%fcs"Mb  
 pMenu->SetDefaultItem(ID_EXITICON); 4J3cQ;z  
 CPoint pt; 9mW95YI S  
 GetCursorPos(&pt); / $7E  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ZW\}4q;[A  
 if(id==ID_EXITICON) ~Aul 7[IH  
  DeleteIcon(); ^mbpt`@  
 else if(id==ID_EXIT) JAM4 R_  
  OnCancel(); ndEW$?W,  
 return FALSE; 1PLxc)LsG  
} < &[=,R0 @  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ?k)(~Y&@p  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) {R b|";  
 AddIcon(); 2aiZ  
 return res; $CXKeWS=Q.  
} uY+N163i  
NLZTIZCK  
void CCaptureDlg::AddIcon() B\BxF6 y  
{ h^#K4/  
 NOTIFYICONDATA data; |` gSkv  
 data.cbSize=sizeof(NOTIFYICONDATA); ni$7)YcF  
 CString tip; !e*BQ3  
 tip.LoadString(IDS_ICONTIP); ^ s< p5V  
 data.hIcon=GetIcon(0); ,gHgb  
 data.hWnd=GetSafeHwnd(); 7XLz Ewa  
 strcpy(data.szTip,tip); 6@_Vg~=S  
 data.uCallbackMessage=IDM_SHELL; g:bw;6^ u  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ^M60#gJ  
 data.uID=98; W#1t%hT$  
 Shell_NotifyIcon(NIM_ADD,&data); n~xh %r;  
 ShowWindow(SW_HIDE); dQ+{Dv3A  
 bTray=TRUE; qI,4 uGg  
} }{<@wE%s  
V<f76U)  
void CCaptureDlg::DeleteIcon() KCG-&p$v@s  
{ nJH+P!AC  
 NOTIFYICONDATA data; -s Iji)t  
 data.cbSize=sizeof(NOTIFYICONDATA); B 14Ziopww  
 data.hWnd=GetSafeHwnd(); V4Yw"J  
 data.uID=98; <{U "0jY!9  
 Shell_NotifyIcon(NIM_DELETE,&data); HS!O;7s'  
 ShowWindow(SW_SHOW); -' 7I|r  
 SetForegroundWindow(); :G?6Hl)~)  
 ShowWindow(SW_SHOWNORMAL); &y-(UOqbkP  
 bTray=FALSE; Q)oO*CnM!-  
} tm27J8wPzV  
$7%e|0jC  
void CCaptureDlg::OnChange() }$-;P=k  
{ T@c{5a  
 RegisterHotkey(); @?,iy?BSG  
} `8$gaA*  
Z~O1$,Z  
BOOL CCaptureDlg::RegisterHotkey() afEhC0j  
{ '{9nQ DgT  
 UpdateData(); z)$X/v  
 UCHAR mask=0; c=]z%+,b]  
 UCHAR key=0; ]AjDe]  
 if(m_bControl) Ar@" K!TS  
  mask|=4; 6{/HNEI*1  
 if(m_bAlt) =1' / ?  
  mask|=2; C^>txui8  
 if(m_bShift) jcNY W_G  
  mask|=1; ~5e)h_y  
  key=Key_Table[m_Key.GetCurSel()]; d\Q~L 3x  
 if(bRegistered){ 5e^t;  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 0zR4Kj7EE  
  bRegistered=FALSE; EN^C'n  
 } Z/nTI 0N{  
 cMask=mask; go^?F- dZ  
 cKey=key; IyvJwrO  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); f=%k9Y*)  
 return bRegistered; <1~5l ~  
} vvEr}G  
R{zAs?j  
  四、小结 ,[6N64fy  
no_(J>p^&  
  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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