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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: g[I b,la_a  
  c^u"I'#Q  
  一、实现方法 /X(t1+  
8X`tU<Ab  
  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: Y/ee~^YxK'  
`m?c;,\  
#pragma data_seg("shareddata") Vf'd*-_!Q<  
HHOOK hHook =NULL; //钩子句柄 Bck7\  
UINT nHookCount =0; //挂接的程序数目 }L3oR  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ]Nl=wZ#`  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 2viM)+  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey :Jy'# c  
static int KeyCount =0; C] 9 p5Hs  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 U{z9>  
#pragma data_seg() *@Y3oh}S  
7L@K _ZJ  
  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。 M^iU;vo  
2 :mn</z  
  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: I8<,U!$  
\B 0ywN?  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ;3: q?&  
cKey,UCHAR cMask) !{ )tSipd  
{ %8Dz o  
 BOOL bAdded=FALSE; a{J,~2>  
 for(int index=0;index<MAX_KEY;index++){ NqEA4C  
  if(hCallWnd[index]==0){ dBe`p5Z  
   hCallWnd[index]=hWnd; &A)B~"[~  
   HotKey[index]=cKey; A~ +S1  
   HotKeyMask[index]=cMask; '|*?*6q  
   bAdded=TRUE; Yd=a}T  
   KeyCount++; 8&~~j7p,  
   break; k^%B5  
  } wUQw!%?>  
 } 0iK;Egwm  
 return bAdded; {h2TD P  
} +$(2:S*r  
//删除热键 'XofD}dm  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) I_%a{$Gjl  
{ ?(m jx  
 BOOL bRemoved=FALSE; vR=6pl$|~~  
 for(int index=0;index<MAX_KEY;index++){ AfP 'EP0m  
  if(hCallWnd[index]==hWnd){ 9D}/\jM  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ *gF<m9&  
    hCallWnd[index]=NULL; d/|D<Sb[s  
    HotKey[index]=0; E%v?t1>/  
    HotKeyMask[index]=0; E}_[QEY;Y  
    bRemoved=TRUE; Ns0cgCrhX  
    KeyCount--; vRxM4O~"  
    break; |t) }VM%  
   } !x>%+&c>k  
  } iNWo"=J  
 } \uq/x^?yo  
 return bRemoved; !$Tw^$n  
} ,4,V4 N  
0}FOV`n  
*B\H-lp?  
  DLL中的钩子函数如下: Vc%R$E%  
qc!MG_{Y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) #8bsxx!s  
{ ofMY,~w  
 BOOL bProcessed=FALSE; <b?!jV7  
 if(HC_ACTION==nCode) u4neXYSy  
 { bb`':3%  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 P<2 +L|X?}  
   switch(wParam) |vMpXiMxxT  
   {  |*Yf.-  
    case VK_MENU: R:AA,^Z  
     MaskBits&=~ALTBIT; 1>Dl\czn  
     break; >,gvb5  
    case VK_CONTROL: =rQP[ICs!  
     MaskBits&=~CTRLBIT; k({\/t3i  
     break; c.f"Gv  
    case VK_SHIFT: 8kt5KnD2  
     MaskBits&=~SHIFTBIT; Ev2HGU[  
     break; %#Z/2<_  
    default: //judge the key and send message lR`'e0Lq  
     break; ^o@,3__7Q  
   } Y<b-9ai<w  
   for(int index=0;index<MAX_KEY;index++){ l?DJJ|>O  
    if(hCallWnd[index]==NULL) st &  
     continue; 2Nm>5l  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) kctzNGF|  
    { 1 s*.A6EP"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); je4w=]JV  
     bProcessed=TRUE; d:q +  
    } Rqy0Q8K<  
   } #:|+XLL  
  } ror|R@;y  
  else if((lParam&0xc000ffff)==1){ //有键按下 %Lrd6i_j  
   switch(wParam) f0SAP0M3  
   { ~i_Tw#}  
    case VK_MENU: a=$t&7;,  
     MaskBits|=ALTBIT; gx:;&4AD  
     break; lvpc*d|K  
    case VK_CONTROL: X$\i{p9jw  
     MaskBits|=CTRLBIT; fiI $T:g.  
     break; w[-Fm+A>  
    case VK_SHIFT: <U9/InN0[  
     MaskBits|=SHIFTBIT; EQIo5  
     break; {"H2 :-t<  
    default: //judge the key and send message 1?Aga,~k:a  
     break; ph|ZG6:  
   } Ei3zBS?J)  
   for(int index=0;index<MAX_KEY;index++){ ia{c  
    if(hCallWnd[index]==NULL) vN OH&ja-s  
     continue; %=<IGce  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (9mMkU=  
    { lE ;jCN  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); XC3Kh^  
     bProcessed=TRUE; '[(nmx'yVJ  
    } o1OBwPj  
   } Gy Qm/I  
  } _uu<4c   
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 RF!1oZ  
   for(int index=0;index<MAX_KEY;index++){ :9Y$'+ <&H  
    if(hCallWnd[index]==NULL) %_aMl  
     continue; @C-dG7U.P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) R,!Q Zxmg  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Ld,5iBiO:  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 B 2 .q3T  
   } 5;TuVU.8Q  
  } x2#qg>`l  
 } s& {Qdf  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); PaCzr5!~f  
} jSQ9.%4  
>(tn"2  
  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: B)h>8 {  
Uo_tUp_Q  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ]Lqt( c  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); p'?w2YN/  
8{Fm[ %"  
  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: 8?Y['  
Vjm_F!S  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) M}"r#Plq  
{ yISD/ g  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) MuEy>dl  
 { L1)@z8]   
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 tue/4Q#7  
  SaveBmp(); $H'X V"<o  
  return FALSE; %YlTF\-  
 } $\Tkhq<  
 …… //其它处理及默认处理 VnJMmMM  
} h? yG<>wI  
*sfD#Bi]  
N<_Ko+VF  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 } i)$n(A)K  
qturd7  
  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。 Y ZaP  
7/X"z=Q^|  
  二、编程步骤 h#Ce_,o  
Cw,D{  
  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"; 3|@t%K  
{-63/z  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 3rf#Q }"  
tllBCuAe  
  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; 8xI`jE"1  
W)SjQp6  
  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; Hwe)Tsh e  
s3lwu :4f  
  5、 添加代码,编译运行程序。 ?&h3P8  
=ziy`#fm,  
三、程序代码 Oz:ZQ M  
yNJAWM7  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 2+9 2Q_+  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)  D\T!4q'Q  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ bn 4 &O  
#if _MSC_VER > 1000 8]0:1 {@  
#pragma once -Ubj6 t_K  
#endif // _MSC_VER > 1000 '3kcD7  
#ifndef __AFXWIN_H__ #DP7SO  
#error include 'stdafx.h' before including this file for PCH 2Q$\KRE  
#endif GG'Sp53GE  
#include "resource.h" // main symbols 7-9;PkGG.A  
class CHookApp : public CWinApp N^elVu4 K  
{ ^4`&EF  
 public: i&@,5/'-_O  
  CHookApp(); DQ=N1pft2v  
  // Overrides A@$fb}CF  
  // ClassWizard generated virtual function overrides D?+ RJs  
  //{{AFX_VIRTUAL(CHookApp) >4![&&  
 public: >3 Ko.3&  
  virtual BOOL InitInstance(); |r~ uos  
  virtual int ExitInstance(); iM64,wnA  
  //}}AFX_VIRTUAL bGh0<r7R  
  //{{AFX_MSG(CHookApp) %7`d/dgR  
  // NOTE - the ClassWizard will add and remove member functions here. Wm6dQQ;Bj  
  // DO NOT EDIT what you see in these blocks of generated code ! iWXMKu  
  //}}AFX_MSG ^w6eWzI  
  DECLARE_MESSAGE_MAP() #cEq_[yI  
}; sdF3cX  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 2Yyb#Ow  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); hrM"Zg  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 5(}H ?  
BOOL InitHotkey(); ^)cM&Bx t%  
BOOL UnInit(); hBCR]=']  
#endif GMFc K=  
CT5Y/E? }  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ~440# kj<  
#include "stdafx.h" /.Wc_/  
#include "hook.h" Io+IRK  
#include <windowsx.h> lfMH1llx  
#ifdef _DEBUG K M]Wl_z  
#define new DEBUG_NEW L^KdMMz;  
#undef THIS_FILE TSyzdnMvz  
static char THIS_FILE[] = __FILE__; o#d$[oa  
#endif L/k40cEI^z  
#define MAX_KEY 100 WX*cICb5  
#define CTRLBIT 0x04 BpXEK.Xw  
#define ALTBIT 0x02 HRRngk#lV  
#define SHIFTBIT 0x01 S.fXHtSx  
#pragma data_seg("shareddata") ti;%BS  
HHOOK hHook =NULL; iE{Oit^aG  
UINT nHookCount =0; `03<0L   
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey  $o+&Y5:  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT `p"U  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey CSL4P)  
static int KeyCount =0; ._BB+G  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift <jL#>L%%  
#pragma data_seg() $u,G Vq~  
HINSTANCE hins; "=`~iXT{e  
void VerifyWindow(); 0e9A+&r  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) w:tGPort  
//{{AFX_MSG_MAP(CHookApp) DM/hcY$MW  
// NOTE - the ClassWizard will add and remove mapping macros here. dt.-C_MO  
// DO NOT EDIT what you see in these blocks of generated code! zlX! xqHj  
//}}AFX_MSG_MAP 59qnEIi  
END_MESSAGE_MAP() GHrBK&  
jg^^\n  
CHookApp::CHookApp() mSj76' L#  
{ u-/3(dKt  
 // TODO: add construction code here, J:W'cH$cR  
 // Place all significant initialization in InitInstance S^g]:Xh&  
} Fr/QW7B5  
`1p?*9Ssn  
CHookApp theApp; 5fxbA2\  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) $WD +Q@6  
{ \R;K>c7=  
 BOOL bProcessed=FALSE; v=bv@c  
 if(HC_ACTION==nCode) ZmO' IT=Ye  
 { Hrv),Ce  
  if((lParam&0xc0000000)==0xc0000000){// Key up wL|7mMM,  
   switch(wParam) zuj;T,R;  
   { I! ITM<Z$l  
    case VK_MENU: &1$8q0  
     MaskBits&=~ALTBIT; }-@I#9  
     break; ^k9rDn/AW  
    case VK_CONTROL: K-Y* T}?  
     MaskBits&=~CTRLBIT; { ;' :h  
     break; pqd4iR Wv  
    case VK_SHIFT: ^*zW"s  
     MaskBits&=~SHIFTBIT; B$EK_@M  
     break; _9qEZV  
    default: //judge the key and send message i-Ljff  
     break; W.GN0(uG  
   } <VgE39 [  
   for(int index=0;index<MAX_KEY;index++){ 'v`~(9'Rcj  
    if(hCallWnd[index]==NULL) G32_FQ$ b  
     continue; k%a?SU<f  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) x_pMG!2  
    { ;op'V6iG  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); qSCTFJ0  
     bProcessed=TRUE; K/A ? ]y  
    } *kV#)j  
   } v @_?iC"`  
  } ]LY^9eK)>{  
  else if((lParam&0xc000ffff)==1){ //Key down YmA) @1@U  
   switch(wParam) ma`w\8 a  
   { ;C6O3@Q  
    case VK_MENU: K;kLQ2)  
     MaskBits|=ALTBIT; {)jk_&c7  
     break; qFGB'mIrFz  
    case VK_CONTROL: .k|-Ks|d|  
     MaskBits|=CTRLBIT; ^K*~ <O-  
     break; aliQ6_  
    case VK_SHIFT: \c'%4Ao  
     MaskBits|=SHIFTBIT; !}C4{Bgt*  
     break; _fe0,  
    default: //judge the key and send message k@lXXII ?  
     break; ]qF<Zw7  
   } 5]Z]j[8Y  
   for(int index=0;index<MAX_KEY;index++) 7a27^b  
   { y>&VtN{E  
    if(hCallWnd[index]==NULL) )<tzm'Rc  
     continue; 8:BQHYeJK  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !4!S{#<q  
    { 6#/LyzZq|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); `,Q<YT ~  
     bProcessed=TRUE; ] +sSg=N7i  
    } >dcqPNDg1^  
   } .w=:+msL{(  
  } ?\l!]vu*  
  if(!bProcessed){ |' !7F9GP  
   for(int index=0;index<MAX_KEY;index++){ [_h.1oZp~  
    if(hCallWnd[index]==NULL) FK?mS>G6  
     continue; ]VmzKA|h+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) @ICejB<  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); =k_XKxd  
   } `mWQWx$V!  
  } WCWSLEAza  
 } '&1  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); u>j5`OXo  
} qb 46EZu  
.)?2)Fl  
BOOL InitHotkey() dW:w<{a!R  
{ T;xHIg4  
 if(hHook!=NULL){ ;N9n'Sq4  
  nHookCount++; _-YL!oP  
  return TRUE; Nt?2USTs-  
 } 'bbV<? ):  
 else nDwq!LEx%5  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); P((S2"D<4  
  if(hHook!=NULL) 19pND m2H1  
   nHookCount++; (bM)Nd  
  return (hHook!=NULL); IH*U!_ `  
} `,hW;p>-  
BOOL UnInit() 5>0\e_V  
{ ,7WK<0  
 if(nHookCount>1){ gizmJ:<  
  nHookCount--; &T5f H!?4  
  return TRUE; cS. 7\0$  
 } JsHxQ0Tw  
 BOOL unhooked = UnhookWindowsHookEx(hHook); %D`^  
 if(unhooked==TRUE){ ktkn2Twa/  
  nHookCount=0; RcKQER  
  hHook=NULL; m&(%&}g  
 } :%+^}   
 return unhooked; Ki&WS<,0Z  
} dVjcK/T<  
8N</Yi|n  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) `ja`#%^\u  
{ #r78Ym'aI  
 BOOL bAdded=FALSE; $4#=#aKW.  
 for(int index=0;index<MAX_KEY;index++){ <yPq;#z(!  
  if(hCallWnd[index]==0){ mdmZ1:PBM  
   hCallWnd[index]=hWnd; YMd&To0s  
   HotKey[index]=cKey; JMl ,  N  
   HotKeyMask[index]=cMask; %5( EkP  
   bAdded=TRUE; .Bm^3A  
   KeyCount++; EIy]qAE:f  
   break; 35-DnTv  
  } H-nFsJ(R!c  
 } EN5G:hD  
 return bAdded; tU-#pB>H  
} %N?W]vbra  
'b?#4rq}  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) %Q>~7P  
{ Q>06dO~z8  
 BOOL bRemoved=FALSE; 1( QWt  
 for(int index=0;index<MAX_KEY;index++){ E.En$'BvB  
  if(hCallWnd[index]==hWnd){ Q 37V!  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ySPlyhGF  
    hCallWnd[index]=NULL; zyQ,unu  
    HotKey[index]=0; zz+M1n-;o  
    HotKeyMask[index]=0; 4w?]dDyc%  
    bRemoved=TRUE; ~jgN_jz  
    KeyCount--; UpE1PLZlB  
    break; wz|Q%.%?[  
   } cP$wI;P  
  } +S:u[x  
 } &+|jJ{93z  
 return bRemoved; 75^)Ni  
} UeK, q>i  
%nG~u,_2f  
void VerifyWindow() S>vVjq?~l(  
{ `% #zMS  
 for(int i=0;i<MAX_KEY;i++){ gz)wUQ|W  
  if(hCallWnd!=NULL){ )edU <1P  
   if(!IsWindow(hCallWnd)){ )f:!#v(K  
    hCallWnd=NULL; R?={{+O  
    HotKey=0; x3p;H02i\  
    HotKeyMask=0; =F!",a~  
    KeyCount--; :"y7Weh  
   } m;$F@JJ  
  } k=d%.kg  
 } 6@ (k8<3  
} nEZ-h7lzl(  
q:D0$YY0  
BOOL CHookApp::InitInstance() o q'J*6r  
{ 5Qm.ECXV  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); fjz2m   
 hins=AfxGetInstanceHandle(); m`1}O"<&i  
 InitHotkey(); r~Is,.zZ}  
 return CWinApp::InitInstance(); <*~BG)b  
} H*:r>Lm=  
I1}{~@  
int CHookApp::ExitInstance() =4w^)'/  
{ CoKj'jA  
 VerifyWindow(); B[U.CAUn  
 UnInit(); #4|i@0n}D  
 return CWinApp::ExitInstance(); PL$(/Z  
} !m/Dd0  
}GU6Q|s[u[  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file x:&L?eOT  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) tp,mw24  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ "*H'bzK  
#if _MSC_VER > 1000 a_}BTkfHa  
#pragma once 9DP75 ti  
#endif // _MSC_VER > 1000 wYS KtG~/S  
"YdDaj</  
class CCaptureDlg : public CDialog -+S~1`0  
{ #mz,HK0|aC  
 // Construction Ws}kb@5  
 public: q[,R%6&'  
  BOOL bTray; f4\p1MYQ  
  BOOL bRegistered; *M\i4FO8  
  BOOL RegisterHotkey(); 88+\mX;A#  
  UCHAR cKey; 4- ?`#  
  UCHAR cMask; ;^H+ |&$>  
  void DeleteIcon(); a?Qcf;o  
  void AddIcon(); O ]4 x;`)  
  UINT nCount; :R_#'i  
  void SaveBmp(); +ouy]b0`t  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor f'?6D+Yw~  
  // Dialog Data tV}ajs  
  //{{AFX_DATA(CCaptureDlg) %>*0.)wG  
  enum { IDD = IDD_CAPTURE_DIALOG }; 6@_@nlA<1  
  CComboBox m_Key; 0g*r!aa  
  BOOL m_bControl; ;?L[]Ezzt  
  BOOL m_bAlt; =~2 Uv>YG  
  BOOL m_bShift; j/`qd(=B  
  CString m_Path; Lq8Z!AIw>  
  CString m_Number; ] F) -}  
  //}}AFX_DATA NcY0pAR*  
  // ClassWizard generated virtual function overrides Q17o5##x7  
  //{{AFX_VIRTUAL(CCaptureDlg) N~K)0RETn  
 public: YC,.Y{oY{  
  virtual BOOL PreTranslateMessage(MSG* pMsg); tEs[zo+DR-  
 protected: X-) ]lAP  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support fylA 0{  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); c%,6L<[  
  //}}AFX_VIRTUAL 3x;y}:wQa  
  // Implementation C9; X6  
 protected: `] dx%  
  HICON m_hIcon; {p_vR/ yN  
  // Generated message map functions #o |&MV_j  
  //{{AFX_MSG(CCaptureDlg) # *aGzF  
  virtual BOOL OnInitDialog(); tH|Q4C  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); A ** M"T  
  afx_msg void OnPaint(); <cS7L0h  
  afx_msg HCURSOR OnQueryDragIcon(); oB}G^t  
  virtual void OnCancel(); Hn]n]wsLy  
  afx_msg void OnAbout(); k2,oyUT=S  
  afx_msg void OnBrowse(); QRG)~  
  afx_msg void OnChange(); GWE0 UO}  
 //}}AFX_MSG R (Pa Q  
 DECLARE_MESSAGE_MAP() ^HN  
}; [ BC%$Sj  
#endif ii] =C(e9  
~^ 5n$jq  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 9QQ@Y}  
#include "stdafx.h" CR PE?CRQF  
#include "Capture.h" :W<,iqSCm  
#include "CaptureDlg.h" WHj4#v(  
#include <windowsx.h> [q{Txe  
#pragma comment(lib,"hook.lib") 3 BhA.o  
#ifdef _DEBUG L-:L= snO  
#define new DEBUG_NEW tJF~Xv2L!  
#undef THIS_FILE GBOmVQ $Hb  
static char THIS_FILE[] = __FILE__; G?1V~6  
#endif ``)1`wx$  
#define IDM_SHELL WM_USER+1 yt#;3  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); sTstc+w  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 6rCP]YnF  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 7Mg7B  
class CAboutDlg : public CDialog KGLhl;a  
{ GyM%vGl 3  
 public: v.&*z48  
  CAboutDlg(); 8!`.%)- 4  
  // Dialog Data adPU)k_j:  
  //{{AFX_DATA(CAboutDlg) Lj* =*V  
  enum { IDD = IDD_ABOUTBOX }; !!X9mI|2|  
  //}}AFX_DATA 6f9<&dCK  
  // ClassWizard generated virtual function overrides Y52xrIvl\  
  //{{AFX_VIRTUAL(CAboutDlg) @X><lz  
 protected: 34M.xB   
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support [?6D1b[  
  //}}AFX_VIRTUAL yzzre>F  
  // Implementation 6uE1&-:L  
 protected: ;Sl0kSu  
  //{{AFX_MSG(CAboutDlg) Gqb-3n gH  
  //}}AFX_MSG q@Yt`$VTN  
  DECLARE_MESSAGE_MAP() tZ24}~da  
}; KK3xz*W0  
Wk#-LkI  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) tSLl'XeN  
{ V>j`  
 //{{AFX_DATA_INIT(CAboutDlg) f9=X7"dzP  
 //}}AFX_DATA_INIT )KQv4\0y<  
} uB"m!dL  
BU{ V,|10a  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) .wn_e=lT  
{ tpzdYokh >  
 CDialog::DoDataExchange(pDX); RKb3=} *C  
 //{{AFX_DATA_MAP(CAboutDlg) m)2hl~o_  
 //}}AFX_DATA_MAP wyEgm:Vt  
} [!efQap  
-"fq34v  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) CKw)J}z  
 //{{AFX_MSG_MAP(CAboutDlg) <Y'YpH`l  
 // No message handlers w3UJw  
 //}}AFX_MSG_MAP _ShJ3\,K  
END_MESSAGE_MAP() /4BXF4ksi,  
s(LqhF[N2]  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) qinQ5t  
: CDialog(CCaptureDlg::IDD, pParent) r>@/XYK&\  
{ O*CX@Ne  
 //{{AFX_DATA_INIT(CCaptureDlg) uKzz/Y{  
  m_bControl = FALSE; 717m.t,x  
  m_bAlt = FALSE; 3;gtuqwD$  
  m_bShift = FALSE; [zd-=.:+M[  
  m_Path = _T("c:\\"); 1h0ohW  
  m_Number = _T("0 picture captured."); 'MlC 1HEp  
  nCount=0; 6_><W"r:]  
  bRegistered=FALSE; H pfI  
  bTray=FALSE; 1OeDWEcB  
 //}}AFX_DATA_INIT )O(Gw-jWE  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 %K,,Sl_  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); n=MYv(Pp}  
} jM<Ihmh|  
7B :aJfxM  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) L%Hm# eFx  
{ <xNM@!'\h  
 CDialog::DoDataExchange(pDX); Ot<!YM  
 //{{AFX_DATA_MAP(CCaptureDlg) LA0x6E+I  
  DDX_Control(pDX, IDC_KEY, m_Key); @= 9y5r  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 64s;6=  
  DDX_Check(pDX, IDC_ALT, m_bAlt); rqo<Xt`  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); $^ 3 f}IzA  
  DDX_Text(pDX, IDC_PATH, m_Path); v>PHn69PU  
  DDX_Text(pDX, IDC_NUMBER, m_Number); @C)h;TR  
 //}}AFX_DATA_MAP GQNiBsV  
} P6'I:/V  
[=!MS?-G  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Ik)Q0_<a  
//{{AFX_MSG_MAP(CCaptureDlg) = F<`-6  
 ON_WM_SYSCOMMAND() %/C[\w p81  
 ON_WM_PAINT() 'FXZ`+r|  
 ON_WM_QUERYDRAGICON() _/\H3  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Y>~zt -  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) cK@K\AE  
 ON_BN_CLICKED(ID_CHANGE, OnChange) #<3\}*/  
//}}AFX_MSG_MAP l!'iLq"K(  
END_MESSAGE_MAP() )j*qGsOg  
:UciFIa  
BOOL CCaptureDlg::OnInitDialog() ["/x~\c'N  
{ U\6DEnII?!  
 CDialog::OnInitDialog(); [D\AVx&  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); _s,svQ8#  
 ASSERT(IDM_ABOUTBOX < 0xF000); \OH:xW~  
 CMenu* pSysMenu = GetSystemMenu(FALSE); =Ji:nEl]z  
 if (pSysMenu != NULL) dj]N59<  
 { 6*Qpq7Ml  
  CString strAboutMenu; xb>+~59:  
  strAboutMenu.LoadString(IDS_ABOUTBOX); yp/*@8%_E  
  if (!strAboutMenu.IsEmpty()) Rw% KEUDm  
  { z<*]h^ !3  
   pSysMenu->AppendMenu(MF_SEPARATOR); 'M/&bu r  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); >fQN"(tf  
  } fXj  
 } {}e IpK,+  
 SetIcon(m_hIcon, TRUE); // Set big icon AG2jl/  
 SetIcon(m_hIcon, FALSE); // Set small icon c5pG?jr+d  
 m_Key.SetCurSel(0); w:v:znQrW  
 RegisterHotkey(); %9M49 s  
 CMenu* pMenu=GetSystemMenu(FALSE); x$I>e  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); MG>;|*$%  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ,//=yW  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); =G6@:h=  
 return TRUE; // return TRUE unless you set the focus to a control |7'W)s5.  
} /+YWp>6LU  
V:18]:  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) _A*0K,F-  
{ SF7 Scd  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX)  v<W++X7z  
 { ;<H2N0qJ(  
  CAboutDlg dlgAbout; /.bwwj_;  
  dlgAbout.DoModal(); J$[Vm%56  
 } Sa5y7   
 else -`&;3 7  
 { i YkNtqn/  
  CDialog::OnSysCommand(nID, lParam); ^` THV  
 } cyyFIJj]  
} )-gyDA  
V-0Y~T  
void CCaptureDlg::OnPaint() va<pHSX&I@  
{ rD gl@B3  
 if (IsIconic()) j*}xe'#  
 { |Sm/Uq(c  
  CPaintDC dc(this); // device context for painting <LY+" Y  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); \)*qW[C$a  
  // Center icon in client rectangle H#K|SSqY?  
  int cxIcon = GetSystemMetrics(SM_CXICON); ,H8P mn?  
  int cyIcon = GetSystemMetrics(SM_CYICON); 7 pV3#fQ  
  CRect rect; `N+ P ,  
  GetClientRect(&rect); TzJN,]F!M  
  int x = (rect.Width() - cxIcon + 1) / 2; mMH0 o  
  int y = (rect.Height() - cyIcon + 1) / 2; !WXSrICX[  
  // Draw the icon /2(F  
  dc.DrawIcon(x, y, m_hIcon); C 4,W[L]4"  
 } =9-c*bL  
 else vr$ [  
 { '"Gi&:*nQ<  
  CDialog::OnPaint(); ko$R%W&T  
 } sXA=KD8  
} /DCUwg=0  
T=vI'"w  
HCURSOR CCaptureDlg::OnQueryDragIcon() N{0 D<"  
{ rcCM x"L=  
 return (HCURSOR) m_hIcon; :M16ijkx  
} "- AiC6u  
?FyA2q!  
void CCaptureDlg::OnCancel() dL>ZL1.$  
{ nm..$QL  
 if(bTray) +FI]0r  
  DeleteIcon(); 1ARIZ;H  
  CDialog::OnCancel(); +}]xuYzo  
} lOZZ-  
8}2 `^<U  
void CCaptureDlg::OnAbout() Flsf5 Tr0  
{ TD<.:ul]  
 CAboutDlg dlg; |yr}g-m  
 dlg.DoModal(); JXrMtSp\  
} Nsb13mlY  
J c*A\-qC.  
void CCaptureDlg::OnBrowse() LvS`   
{ bA:abO  
 CString str; 5n<Efi]j  
 BROWSEINFO bi; i{.!1i:  
 char name[MAX_PATH]; [||$1u\%  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); raCxHY  
 bi.hwndOwner=GetSafeHwnd(); B^Vb=* QRo  
 bi.pszDisplayName=name; y7JJ[:~~  
 bi.lpszTitle="Select folder"; SyI#Q[f'_  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; \O56!,k  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 9496ayi  
 if(idl==NULL) eG.?s ;J0  
  return; pV_2JXM~@  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); *5^h>Vk/  
 str.ReleaseBuffer(); ]*).3<Lw  
 m_Path=str; #H|]F86(  
 if(str.GetAt(str.GetLength()-1)!='\\') o&zeOJW  
  m_Path+="\\"; #~"jo[  
 UpdateData(FALSE); iVE+c"c!2&  
} kAMt8  
czafBO6  
void CCaptureDlg::SaveBmp() 0oD?4gn  
{ +]G;_/[2  
 CDC dc; ?(Nls.c  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Xh5 z8  
 CBitmap bm; &W1c#]q@r  
 int Width=GetSystemMetrics(SM_CXSCREEN); P6 9S[aqW  
 int Height=GetSystemMetrics(SM_CYSCREEN); 7+fFKZFKF  
 bm.CreateCompatibleBitmap(&dc,Width,Height); i9Qx{f88  
 CDC tdc; W1 E(( 2  
 tdc.CreateCompatibleDC(&dc); AyddkjX  
 CBitmap*pOld=tdc.SelectObject(&bm); ,Ao8QN  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); I/c* ?  
 tdc.SelectObject(pOld); yA~W|q(/V  
 BITMAP btm; N7XRk= J  
 bm.GetBitmap(&btm); Y:O%xtGi  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; {=TD^>?  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); "~tEmMz  
 BITMAPINFOHEADER bih; % %*t{0!H+  
 bih.biBitCount=btm.bmBitsPixel; l&zd7BM9(  
 bih.biClrImportant=0; a4?:suX$  
 bih.biClrUsed=0; P:=3;d{v  
 bih.biCompression=0; ,{$:Q}`  
 bih.biHeight=btm.bmHeight; 7P=j2;7 v  
 bih.biPlanes=1; qvCl mZ  
 bih.biSize=sizeof(BITMAPINFOHEADER); s {!F@^a  
 bih.biSizeImage=size; |VIBSty2d  
 bih.biWidth=btm.bmWidth; dLLF#N  
 bih.biXPelsPerMeter=0; )!'SSVaRs  
 bih.biYPelsPerMeter=0; @X:P`?("^  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); IL\#!|>  
 static int filecount=0; {JMFCc[  
 CString name; zUeS7\(l  
 name.Format("pict%04d.bmp",filecount++); Rh iiQ  
 name=m_Path+name; wT;D<rqe`  
 BITMAPFILEHEADER bfh; !RV}dhI  
 bfh.bfReserved1=bfh.bfReserved2=0; P7Kp*He)  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Eg>MG87  
 bfh.bfSize=54+size; _jp8;M~Z  
 bfh.bfOffBits=54; F9N)UW:w  
 CFile bf; M%Ov6u<I8  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ bX8Bn0#a+  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); qm2  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); dF"Sz4DY#  
  bf.WriteHuge(lpData,size); 5TqX;=B  
  bf.Close(); ~nw]q<7r  
  nCount++; .Um.dXBYU  
 } @wb V@  
 GlobalFreePtr(lpData); 88G Q  F  
 if(nCount==1) al1Uf]xh  
  m_Number.Format("%d picture captured.",nCount); 5F $W^N  
 else smJ%^'x  
  m_Number.Format("%d pictures captured.",nCount); `8EHhN;  
  UpdateData(FALSE); U\P ;,o  
} A~u-Iv(U  
-W2 !_  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) L]cZPfI6  
{ a8''t_Dp  
 if(pMsg -> message == WM_KEYDOWN) vk&C'&uV9@  
 { |d&a&6U:  
  if(pMsg -> wParam == VK_ESCAPE) *22}b.)  
   return TRUE; >zVj+  
  if(pMsg -> wParam == VK_RETURN) QOMh"wC3  
   return TRUE; F|9 W7  
 } Qn_*(CSp  
 return CDialog::PreTranslateMessage(pMsg); h5>JBLawQP  
} 7YrX3Hx 8  
46Vx)xX  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) YQLp#  
{ _Uc le  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Srg `Tt]  
  SaveBmp(); v [\' M  
  return FALSE; wS9EC}s:Q  
} WbB0{s  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ +Ccj @#M;  
 CMenu pop; 6"b =aPTi  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); @Pb!:HeJE  
 CMenu*pMenu=pop.GetSubMenu(0); U:"E:Bxz;m  
 pMenu->SetDefaultItem(ID_EXITICON); 30bScW<08  
 CPoint pt; :A.dlesv6  
 GetCursorPos(&pt); /Ii a>XY  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 4vQ]7`I.f  
 if(id==ID_EXITICON) sz9C':`W  
  DeleteIcon(); Tapj7/0`  
 else if(id==ID_EXIT) D<78Tm x  
  OnCancel(); sE{A~{a`  
 return FALSE; { <f]6  
} LNOm"D?"  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); MIGcV9hf  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) fL>>hBCqC  
 AddIcon(); 0rP`BK|  
 return res; e@|/, W   
} O0[.*xG  
}&M$  
void CCaptureDlg::AddIcon() }}y~\TB~}  
{ b=(?\  
 NOTIFYICONDATA data; b\& |030+  
 data.cbSize=sizeof(NOTIFYICONDATA); R-5EztmLae  
 CString tip; pCb3^# &o  
 tip.LoadString(IDS_ICONTIP); U51C /A  
 data.hIcon=GetIcon(0); @ W[LA<  
 data.hWnd=GetSafeHwnd(); lB3@ jF  
 strcpy(data.szTip,tip); +X#JCLD  
 data.uCallbackMessage=IDM_SHELL; 2B Dz \  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; SFP%UfM<  
 data.uID=98; b}s)3=X@q  
 Shell_NotifyIcon(NIM_ADD,&data); v 9\2/B  
 ShowWindow(SW_HIDE); ;iEr+  
 bTray=TRUE; >..C^8 "  
} AM?62  
C^2J<  
void CCaptureDlg::DeleteIcon() N{rC#A3  
{ x"7`,W  
 NOTIFYICONDATA data; 6'E3Q=}d  
 data.cbSize=sizeof(NOTIFYICONDATA); b9FfDDOq"  
 data.hWnd=GetSafeHwnd(); vK@t=d  
 data.uID=98; y{{7)G  
 Shell_NotifyIcon(NIM_DELETE,&data); =GGt:3Kx-  
 ShowWindow(SW_SHOW); <B"M} Y>_P  
 SetForegroundWindow(); &"G4yM  
 ShowWindow(SW_SHOWNORMAL); ~m@v ~=  
 bTray=FALSE; /8](M5X]f  
} eksYIQZ]  
r92C^h0  
void CCaptureDlg::OnChange() GP|G[  
{ 6<E4?<O%  
 RegisterHotkey(); %UV'HcO/gp  
} dG {D2~#  
Dl/Jlsd@  
BOOL CCaptureDlg::RegisterHotkey() O:K={#Xj  
{ k#*tf:R  
 UpdateData(); f/!^QL{  
 UCHAR mask=0; L!fiW`>0G  
 UCHAR key=0; CY{`IZ  
 if(m_bControl) \*24NB  
  mask|=4;  ^##tk  
 if(m_bAlt) IYb%f T  
  mask|=2; 8 oK;Tzh  
 if(m_bShift) $%*E)~  
  mask|=1; H ?ZlJ|/c  
  key=Key_Table[m_Key.GetCurSel()]; <X5'uve  
 if(bRegistered){ y:\ ^[y IQ  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); C9?R*2L>  
  bRegistered=FALSE; Mwm=r//  
 } HkH!B.H]  
 cMask=mask; oSDx9%  
 cKey=key; ~[E@P1  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ^4D7sS;~3  
 return bRegistered; .Fdqn?c|+  
} +@ '( N  
o\Ocu>:  
  四、小结 mQVc ZV  
( Lp~: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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