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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: bP%X^q~]A  
  (@bq@0g  
  一、实现方法 W'e{2u  
shiw;.vR{B  
  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: KbH|'/w  
A[^k4 >  
#pragma data_seg("shareddata") & sXMB  
HHOOK hHook =NULL; //钩子句柄 V|<'o<h8  
UINT nHookCount =0; //挂接的程序数目 V5 Gy|X  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 V}JBv$+ko  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 >;}(? +|f  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey yvnvIy  
static int KeyCount =0; #fXy4iL l  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 f*^bV_  
#pragma data_seg() "S>VqvH3  
KYq<n& s  
  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。 jV<5GWq  
-.-@|*5  
  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: HaF&ooI5+  
JtF)jRB0,  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR $-\%%n0>6  
cKey,UCHAR cMask) i6O'UzD@T  
{ v2YU2-X[  
 BOOL bAdded=FALSE; zv^+8h7k  
 for(int index=0;index<MAX_KEY;index++){ @scSW5+  
  if(hCallWnd[index]==0){ %Kh}6   
   hCallWnd[index]=hWnd; BT f  
   HotKey[index]=cKey; y4H/CH$%  
   HotKeyMask[index]=cMask; "po;[ Ia2  
   bAdded=TRUE; %PPkT]~\  
   KeyCount++; x@|10GC#:  
   break; u5`b")a  
  } {<cgeH  
 } vJ;0%;eu[!  
 return bAdded; Ia:M+20n  
} q~{O^,4S  
//删除热键 'a~F'FN$  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) \8k4v#wH  
{ VI.Cmw~S  
 BOOL bRemoved=FALSE; gGs"i]c  
 for(int index=0;index<MAX_KEY;index++){ +Edq4QYwR  
  if(hCallWnd[index]==hWnd){ .EjjCE/v-  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ \^lDd~MWG  
    hCallWnd[index]=NULL; i{r[zA]$  
    HotKey[index]=0; s2#}@b6'.  
    HotKeyMask[index]=0; sjHcq5#U!  
    bRemoved=TRUE; ]@l;;Sp  
    KeyCount--; 2=| Ks]<P  
    break; UUvR>5@n  
   } 1([?EfC  
  } xk^`4;  
 } 41+@!`z7  
 return bRemoved; NkAu<> G _  
} ]hbrzv o  
|}d+BD  
hKe ms3  
  DLL中的钩子函数如下: ]zI*}(adu  
-r[O_[g w  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) k40`,;}9  
{ HUel  
 BOOL bProcessed=FALSE; P R_| 8H|  
 if(HC_ACTION==nCode) +t(Gt0+  
 { "_\77cqpTh  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 _t6 .9CXl  
   switch(wParam) p)~EG=p  
   {  sDkO!P  
    case VK_MENU: =!($=9  
     MaskBits&=~ALTBIT; ayLINpL  
     break; bq{eu#rQJ  
    case VK_CONTROL: cq$ _$jRx  
     MaskBits&=~CTRLBIT; L; <Pod  
     break; MO|8A18B  
    case VK_SHIFT: RuOse9  
     MaskBits&=~SHIFTBIT; -hGLGF??  
     break; ^,Ft7JAn  
    default: //judge the key and send message xBE}/F$ 45  
     break; L(HAAqRnJ  
   } )c.!3n/pb  
   for(int index=0;index<MAX_KEY;index++){ V:lKF')  
    if(hCallWnd[index]==NULL) f~f)6XU|  
     continue; < WQ ~X<1D  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 4^ZbT  
    { @\U] hN?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); zo1 fUsK?  
     bProcessed=TRUE; 26=G%F6  
    } 'lOpoWDL  
   } SjvSnb_3  
  } -CTLQyj)  
  else if((lParam&0xc000ffff)==1){ //有键按下 [u^~ND'  
   switch(wParam) Bsj^R\  
   { )vGxF}I3  
    case VK_MENU: 9{-H/YS\_s  
     MaskBits|=ALTBIT; wjHH%y  
     break; zuJ@@\75  
    case VK_CONTROL: q( %)^C  
     MaskBits|=CTRLBIT; r(g# 3i4Q  
     break; {@[#0gPH  
    case VK_SHIFT: GGsAisF"N  
     MaskBits|=SHIFTBIT; K#R|GEwr  
     break; :,.HJ[Vg&  
    default: //judge the key and send message  H@sM$8  
     break; ]ts^h~BZ$  
   } )hD77(c  
   for(int index=0;index<MAX_KEY;index++){ oW6b3Q /B  
    if(hCallWnd[index]==NULL) D@m3bsMwe  
     continue; &pH XSU  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 4p>,  
    { m:cWnG  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); C-&s$5MzGb  
     bProcessed=TRUE; USKC,&6&}  
    } 96%N  
   } *`t3z-L  
  } #r@>.S=U]  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 % "^CrG  
   for(int index=0;index<MAX_KEY;index++){ Nh^q&[?  
    if(hCallWnd[index]==NULL) )!'7!" $  
     continue; fjm 3X$tR  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Xv xrz{  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); vtRz;~,Z  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 HC| ]Au  
   } 03!#99  
  }  K"Gea`I  
 } /&5:v%L  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); '_" S/X +v  
} y/"CWD/i  
b\H,+|i K  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: b[MKo7  
=P,pW  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); (Vt5@25JW  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); }*7Gq  
 }S}%4c>  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 6dYa07  
1vCVTuRF  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 5[P^O6'  
{ <4N E)!#  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) wIF)(t-):  
 { (i-L:  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 wYh]3  
  SaveBmp(); [!4V_yOb  
  return FALSE; J,k.*t:  
 } W2A!BaH%  
 …… //其它处理及默认处理 ~$YasFEz  
} E>F6!qYm  
$LtCI  
VA%4ssy  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 H:o=gP60]  
E/_n}$Z  
  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。 GZ.KL!,R!  
>skl-f  
  二、编程步骤 Srrzj-9^)K  
}1NNXxQ  
  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"; MgH O WoF  
h-\+# .YP  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; +<WNAmh   
kuv+TN  
  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; (>gb9n  
T|uG1  
  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} Y .  
ty8E;[ '  
  5、 添加代码,编译运行程序。 2D"aAI<P  
:v^OdW  
三、程序代码 COA>y?  
M?I^`6IOc8  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL nsu RG  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) U+ V yH4"  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 8 LsJ}c  
#if _MSC_VER > 1000 3/8<dc  
#pragma once FMC]KXSd  
#endif // _MSC_VER > 1000 =@MJEo`D  
#ifndef __AFXWIN_H__ `|4k>5k  
#error include 'stdafx.h' before including this file for PCH ,j eC7-tX  
#endif  Bm&6  
#include "resource.h" // main symbols n"nfEA3{`  
class CHookApp : public CWinApp I~,bZA  
{ ra^"Vr  
 public: ^_uCSA'X  
  CHookApp(); )-\qo#0l  
  // Overrides Uf~5Fc1d =  
  // ClassWizard generated virtual function overrides i\kDb=  
  //{{AFX_VIRTUAL(CHookApp) BxB B](  
 public: 5)ooE   
  virtual BOOL InitInstance(); 0+KSD{  
  virtual int ExitInstance(); 5e&;f  
  //}}AFX_VIRTUAL wM! dz&  
  //{{AFX_MSG(CHookApp) ,Eo\(j2F.  
  // NOTE - the ClassWizard will add and remove member functions here. 2g;Id.i>  
  // DO NOT EDIT what you see in these blocks of generated code ! S(_DR 8  
  //}}AFX_MSG 4j<[3~:0 o  
  DECLARE_MESSAGE_MAP() N: 5 N}am  
}; UtHloq(r  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); HP:[aR!2P  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %Hu.FS5'  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); =0SJf 3  
BOOL InitHotkey(); _Zxo <}w}y  
BOOL UnInit(); T5wVJgN>  
#endif T2|os{U  
8( bK\-b  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. GF*uDJ Kp  
#include "stdafx.h" P|TM4i]  
#include "hook.h" \ !IEZ  
#include <windowsx.h> 'a>D+A:  
#ifdef _DEBUG 'a"Uw"/p[  
#define new DEBUG_NEW fP llN8n  
#undef THIS_FILE x\YVB',h  
static char THIS_FILE[] = __FILE__; 2%) ~E50U  
#endif {d> 6*b  
#define MAX_KEY 100 JY3!jtv  
#define CTRLBIT 0x04 :bXTV?#0  
#define ALTBIT 0x02 N:,V{Pw  
#define SHIFTBIT 0x01 i#PR Tbc  
#pragma data_seg("shareddata") ]hZk #rp}  
HHOOK hHook =NULL; \8USFN~(Y  
UINT nHookCount =0; ypx`!2Q$  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey =`l><  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT )/Oldyp  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 15MKV=?oY  
static int KeyCount =0; n%!50E6*:  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift =>7czw:S 1  
#pragma data_seg() ~w(A3I.  
HINSTANCE hins; ed#>q;jX  
void VerifyWindow(); S`vw<u4t  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) u\km_e  
//{{AFX_MSG_MAP(CHookApp) >]2^5C;  
// NOTE - the ClassWizard will add and remove mapping macros here. ?F~0\T,7  
// DO NOT EDIT what you see in these blocks of generated code! {ea*dX872:  
//}}AFX_MSG_MAP ^Zlbs goZ  
END_MESSAGE_MAP() ,<[x9 "3\  
]PbwG  
CHookApp::CHookApp() ${`q!  
{ |C>\k u*  
 // TODO: add construction code here, D2zqDo<+;  
 // Place all significant initialization in InitInstance y|3!E>Up  
} ;|f]e/El  
!"'@c  
CHookApp theApp; p$<){,R  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) jEK{47i v  
{ !ED,'d%J  
 BOOL bProcessed=FALSE; 4+4&}8FH  
 if(HC_ACTION==nCode) ]Nue1xV_  
 { B0^:nYko  
  if((lParam&0xc0000000)==0xc0000000){// Key up eGo$F2C6E  
   switch(wParam) },#AlShZu  
   { 5"D\n B%  
    case VK_MENU: {(h!JeQ  
     MaskBits&=~ALTBIT; H-8_&E?6m  
     break; ""jl  
    case VK_CONTROL: {wD "|K  
     MaskBits&=~CTRLBIT; mOb@w/f  
     break; FQcm =d_s  
    case VK_SHIFT: .C1g Dry]  
     MaskBits&=~SHIFTBIT; {3 >`k.w  
     break; q\Z9.T+Qo  
    default: //judge the key and send message N]G`]  
     break; .GFKy  
   } !ce,^z&5  
   for(int index=0;index<MAX_KEY;index++){ mHNqzdaa  
    if(hCallWnd[index]==NULL) )XYCr<s2"  
     continue; UO-,A j*wW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &pAmFe  
    { F^Mt}`O  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); >9[wjB2?}  
     bProcessed=TRUE; ,MD >Jx|  
    } +lJD7=%K]Z  
   } 2F:X:f  
  } $EZr@n  
  else if((lParam&0xc000ffff)==1){ //Key down kb'l@d#E  
   switch(wParam) Qe=eer~jI  
   { t0)hd X  
    case VK_MENU: Rz33_ qA  
     MaskBits|=ALTBIT; &9xcP.3  
     break; Zy6>i2f4f  
    case VK_CONTROL: S|_lb MZM  
     MaskBits|=CTRLBIT; ;5}"2hU>  
     break; ;AT~?o`n  
    case VK_SHIFT: gn[h:+H&  
     MaskBits|=SHIFTBIT; M'$?Jp#]}  
     break; j7C&&G q  
    default: //judge the key and send message dj3E20Ws  
     break; {|tMN,Z  
   } EyV6uk~  
   for(int index=0;index<MAX_KEY;index++) kk aS&r>  
   { <:~'s]`zf  
    if(hCallWnd[index]==NULL) M_\)<a(8  
     continue; J8h H#7WMS  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !(qaudX{>k  
    { }vQ Y+O  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); n^rzl6dy  
     bProcessed=TRUE; _^Q =n>G  
    } Z'y:r2{ql  
   } vrXNa8,L  
  } fMZc_dsW9  
  if(!bProcessed){ N#vV;  
   for(int index=0;index<MAX_KEY;index++){ CS Isi]H  
    if(hCallWnd[index]==NULL) 50`<[w<J q  
     continue; Ga $EM  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) =%d0MZD  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); <{A|Xs  
   } s#V:! 7  
  } fvw&y+|y!  
 } |?<r  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); %2rUJaOgy$  
} 4CioVQdj  
8f-B-e?k  
BOOL InitHotkey() r`d.Wy Zj  
{ 1EA}[x  
 if(hHook!=NULL){ 2]-xmS>|b  
  nHookCount++; ;O * o  
  return TRUE; =VDtZSa!$^  
 } t+ O7dZt%r  
 else iCZ1ARi  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); #6qLu  
  if(hHook!=NULL) kG]FB.@bG  
   nHookCount++; >tVD[wVF0  
  return (hHook!=NULL); J l9w/T  
} 5SmgE2}  
BOOL UnInit() . g95E<bd  
{  9/R<,  
 if(nHookCount>1){ **lT ' D  
  nHookCount--; (= ,w$  
  return TRUE; 'Lv>!s 7  
 } 9Y-6e0B:  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ,daZ KxT  
 if(unhooked==TRUE){ P*sb@y>}O  
  nHookCount=0; XKT2u!Lx  
  hHook=NULL; !JVpR]lWS  
 } <MoKTP-<  
 return unhooked; ]{'lV~fc  
} >6zXr.  
8t Ef>  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) NKS-G2 Y<P  
{ E;C=V2#>[  
 BOOL bAdded=FALSE; by%k*y  
 for(int index=0;index<MAX_KEY;index++){ [X|KXlNfm  
  if(hCallWnd[index]==0){ 9a0ibN6m  
   hCallWnd[index]=hWnd;  h2]gA_T`  
   HotKey[index]=cKey; */yR _f  
   HotKeyMask[index]=cMask; $f]dL};  
   bAdded=TRUE; QnNddCiu=  
   KeyCount++; 5 NdIbC  
   break; t=$Hv  
  } bp?4)C*R  
 } *wetPt)~v_  
 return bAdded; 1P+Te,I  
} b];? tP  
-YHyJs-bU  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) L 2:N@TP  
{ =/jCDY  
 BOOL bRemoved=FALSE; 8f0Ytfhw  
 for(int index=0;index<MAX_KEY;index++){ EZvf\s>LT  
  if(hCallWnd[index]==hWnd){ 8~")9w  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Lw!Q*3c  
    hCallWnd[index]=NULL; #XJ`/\E]  
    HotKey[index]=0; ;_vo2zl1  
    HotKeyMask[index]=0;  M} {'kK  
    bRemoved=TRUE; 4q7hL  
    KeyCount--; EsR$H2"  
    break; g`BtG  
   } pZv>{=2hOS  
  } };=44E'7  
 } >^fkHbgNQ  
 return bRemoved;  ,m-/R  
} $rG~0  
PLmf.hD\  
void VerifyWindow() Z-D4~?Tv  
{ &:" [hU  
 for(int i=0;i<MAX_KEY;i++){ Fl'+ C  
  if(hCallWnd!=NULL){ \-?@ &' :  
   if(!IsWindow(hCallWnd)){ f4TNy^-  
    hCallWnd=NULL; a8Q=_4 l  
    HotKey=0; psHW(Z8G  
    HotKeyMask=0; _Bh ^<D-  
    KeyCount--; v)a$;P%  
   } DWQ@]\  
  } 3:;2Av2(X.  
 } 9(PQ7}  
} )K0BH q7r  
.jfkOt?2  
BOOL CHookApp::InitInstance() rz @;Zn  
{ [e:mRMi  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); $O/@bh1@p  
 hins=AfxGetInstanceHandle(); x*" 0dYH  
 InitHotkey(); x3JX}yCX  
 return CWinApp::InitInstance(); E9L)dMZSpj  
}   vZQ'  
h* to%N  
int CHookApp::ExitInstance() 3 oG5E"G  
{ I<'wZJRRa  
 VerifyWindow(); Q]q`+ Z65  
 UnInit(); HktvUJ(Ii  
 return CWinApp::ExitInstance(); %S<0l@=5`l  
} P1Z+XRWOM  
R0n# FL^E  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file q~^qf  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 2^}E!(<  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ [a&|c%h  
#if _MSC_VER > 1000 AC$:.KLI  
#pragma once CCp8,  
#endif // _MSC_VER > 1000 ]&')# YO  
/idQfff  
class CCaptureDlg : public CDialog Q)7iu  
{ (qDu|S3P  
 // Construction .."=  
 public: F0O/SI(cA  
  BOOL bTray; JO4rU- n  
  BOOL bRegistered; ? (&)p~o  
  BOOL RegisterHotkey(); 1Qi5t?{  
  UCHAR cKey; p/4\O  
  UCHAR cMask; /mb?C/CI  
  void DeleteIcon(); M>pcG.6V  
  void AddIcon(); Xgge_`T9  
  UINT nCount; -/>SdR$D7  
  void SaveBmp(); ]*8K4n G  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ay\e# )  
  // Dialog Data Q0)6 2[cMm  
  //{{AFX_DATA(CCaptureDlg) uY,(3x  
  enum { IDD = IDD_CAPTURE_DIALOG }; ;TAf[[P  
  CComboBox m_Key; VpDNp (2  
  BOOL m_bControl; _E[zYSo`  
  BOOL m_bAlt; L#Mul&r3x0  
  BOOL m_bShift; cr{;gP  
  CString m_Path; d]JiJgfa%  
  CString m_Number; a&6e~E$K2  
  //}}AFX_DATA e12.suv  
  // ClassWizard generated virtual function overrides ]UR@V;JG  
  //{{AFX_VIRTUAL(CCaptureDlg) eIz T(3(  
 public: ;]* %wX  
  virtual BOOL PreTranslateMessage(MSG* pMsg); c~B[ <.Qj  
 protected: 5 ",@!1ju  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support L'dR;T[;  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 9sQ4 $  
  //}}AFX_VIRTUAL ggr\nY  
  // Implementation gpBpG  
 protected: W}<'Y@[ ,  
  HICON m_hIcon; jG"n);WF  
  // Generated message map functions CNCWxu  
  //{{AFX_MSG(CCaptureDlg) `K.2&6xc  
  virtual BOOL OnInitDialog(); k_p4 f%9  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Zrtyai{8l  
  afx_msg void OnPaint(); O1+2Z\F  
  afx_msg HCURSOR OnQueryDragIcon(); [FHSFr E,5  
  virtual void OnCancel(); l$ABOtM@  
  afx_msg void OnAbout(); @Sxb}XI!f  
  afx_msg void OnBrowse(); 0ZY.~b'eu  
  afx_msg void OnChange(); :Ogt{t  
 //}}AFX_MSG [whX),3>  
 DECLARE_MESSAGE_MAP() ,/O,j SRk  
}; 6Z:<?_p%7g  
#endif Sm6hyZFy  
R;2tb7o  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 26yjQ  
#include "stdafx.h" &tT*GjPwg;  
#include "Capture.h" ;A ~efC^<  
#include "CaptureDlg.h" cNi)[2o7  
#include <windowsx.h> ys+ AY^/  
#pragma comment(lib,"hook.lib") 0_d,sC?V  
#ifdef _DEBUG ['p%$4i$  
#define new DEBUG_NEW C5Fk>[fS  
#undef THIS_FILE >syQDB  
static char THIS_FILE[] = __FILE__; BU-m\Kf)  
#endif 5l"/lGw  
#define IDM_SHELL WM_USER+1 %d<uOCf\Q  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); =+K2`=y;WF  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); a2l\B~n  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 1'q llkT  
class CAboutDlg : public CDialog bo]xah|."j  
{ da c?b (  
 public: NdpcfZ q  
  CAboutDlg(); )<w`E{q  
  // Dialog Data `m N*"1p-  
  //{{AFX_DATA(CAboutDlg) GfEg][f  
  enum { IDD = IDD_ABOUTBOX }; Rj&V~or  
  //}}AFX_DATA ,2H@xji [  
  // ClassWizard generated virtual function overrides O>Y Xvu  
  //{{AFX_VIRTUAL(CAboutDlg) 6$"gm$3O]  
 protected: K)m\xzT/  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support >Qk4AMIO  
  //}}AFX_VIRTUAL [i7Ug.Oi"  
  // Implementation C_>dJYM  
 protected: ?nWK s  
  //{{AFX_MSG(CAboutDlg) 3B }Oy$p  
  //}}AFX_MSG $tGk,.#j  
  DECLARE_MESSAGE_MAP() Z:Hk'|q}I  
}; ?NV3]vl  
<S*o}:iB  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) i qCZIahf  
{ %G~ f>  
 //{{AFX_DATA_INIT(CAboutDlg) 3*13XQ  
 //}}AFX_DATA_INIT Za+26#g  
} p=T,JAIt  
_x<CTFTL  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) /ESmQc:DWB  
{ N%1T>cp0  
 CDialog::DoDataExchange(pDX); &yFt@g]  
 //{{AFX_DATA_MAP(CAboutDlg) *ujn+0)[  
 //}}AFX_DATA_MAP h=uv4&  
} oM`[&m.,  
uj@rv&  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) G.KZZ-=_4  
 //{{AFX_MSG_MAP(CAboutDlg) $0[T=9q <+  
 // No message handlers vi+k#KE  
 //}}AFX_MSG_MAP Y {]RhRR  
END_MESSAGE_MAP() ]=5nC)|  
") Xy%C`J  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 6PETIs  
: CDialog(CCaptureDlg::IDD, pParent) cwK 6$Ax  
{ Og8:  
 //{{AFX_DATA_INIT(CCaptureDlg) `@MY}/ o.  
  m_bControl = FALSE; !^ko"^p  
  m_bAlt = FALSE; ]d]tQPEU  
  m_bShift = FALSE; 8$ dJh]\Y  
  m_Path = _T("c:\\"); X9^a:7(  
  m_Number = _T("0 picture captured."); ^:Vwblv(  
  nCount=0; i*`;/x'+  
  bRegistered=FALSE; /"d5<B`%  
  bTray=FALSE; AhOvI {  
 //}}AFX_DATA_INIT y:Ycn+X.  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 K-V NU  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Jq1 Zb  
} 0( fN  
]m0MbA  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) "g7`Ytln  
{ *Q bPz4,"  
 CDialog::DoDataExchange(pDX); Yn ZV.&4{  
 //{{AFX_DATA_MAP(CCaptureDlg) R3;GMe@D#  
  DDX_Control(pDX, IDC_KEY, m_Key); E7E>w#T5  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); L5C4#X  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ,]e!OZ[$m  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Q>s>@hw  
  DDX_Text(pDX, IDC_PATH, m_Path); )ymd#?wq  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Yrp WGK520  
 //}}AFX_DATA_MAP U[9`:aV;  
} 9H5S@w[je  
A@^e 4\  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) N_TWT&o4  
//{{AFX_MSG_MAP(CCaptureDlg) V6'"J  
 ON_WM_SYSCOMMAND() mq@2zE`.(  
 ON_WM_PAINT() Y2i:ZP  
 ON_WM_QUERYDRAGICON() 7_>No*[  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) L1#z'<IO  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) yRaB\'  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 9W$FX  
//}}AFX_MSG_MAP )&[S*g  
END_MESSAGE_MAP() MH|!tkW>:  
0sW=;R2  
BOOL CCaptureDlg::OnInitDialog() H3T4v1o6  
{ |<&9_Aq_  
 CDialog::OnInitDialog(); \ 4y7!   
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ,.Ac= "f  
 ASSERT(IDM_ABOUTBOX < 0xF000); D2x-Wa  
 CMenu* pSysMenu = GetSystemMenu(FALSE); der'<Q.U:k  
 if (pSysMenu != NULL) zrYhx!@  
 { FCxLL"))  
  CString strAboutMenu; _SM5x,Zd  
  strAboutMenu.LoadString(IDS_ABOUTBOX); C*kGB(H7  
  if (!strAboutMenu.IsEmpty()) l@ vaupg  
  {  }6SfI;  
   pSysMenu->AppendMenu(MF_SEPARATOR); o|lEF+  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); mZ sftby}  
  } fMRBGcg7Dc  
 } KWIH5* AM  
 SetIcon(m_hIcon, TRUE); // Set big icon wzhM/Lmo\z  
 SetIcon(m_hIcon, FALSE); // Set small icon P]A>"-k  
 m_Key.SetCurSel(0); +u;f]p  
 RegisterHotkey(); rnWU[U8%  
 CMenu* pMenu=GetSystemMenu(FALSE); .ky((  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); $@kGbf~k  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND);  ?CKINN  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 7r,'a{Rcn  
 return TRUE; // return TRUE unless you set the focus to a control J+IQvOn_|  
} /Y:1zLs%  
')%Kv`hz  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) y&T(^EA;  
{ %''z~LzJ8  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) u*u>F@C8  
 { >&V?1!N"  
  CAboutDlg dlgAbout; FT'_{e!M  
  dlgAbout.DoModal(); Cw1Jl5OVZ  
 } wW s<{ T  
 else 2Eg* Yb 1  
 { cn1CM'Ru  
  CDialog::OnSysCommand(nID, lParam); FtbqZN[  
 } Z}_{@|  
} i-oi?x<u&(  
xo#&&/6  
void CCaptureDlg::OnPaint() F?=(4Pyvu  
{ \5UwZx\  
 if (IsIconic()) H'68K8i0  
 { (3z: ;  
  CPaintDC dc(this); // device context for painting 0&$+ CWSM  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); lN94 b3_W  
  // Center icon in client rectangle {6Tw+/`P  
  int cxIcon = GetSystemMetrics(SM_CXICON); r:.5O F}  
  int cyIcon = GetSystemMetrics(SM_CYICON); ^/`:o}7K7  
  CRect rect;  R~u0!  
  GetClientRect(&rect); h*2Q0GRX  
  int x = (rect.Width() - cxIcon + 1) / 2; 9hG)9X4  
  int y = (rect.Height() - cyIcon + 1) / 2; ;} ),6R  
  // Draw the icon |@pJ]  
  dc.DrawIcon(x, y, m_hIcon); S^|Uzc  
 } SpbOvY=>  
 else h _6QVab@  
 { Di{T3~fqU  
  CDialog::OnPaint(); hY=#_r8  
 } ?CGbnXZ4Ug  
} l{wHu(1  
OD5c,IkWB  
HCURSOR CCaptureDlg::OnQueryDragIcon() Sd?:+\bS;  
{  TA;  
 return (HCURSOR) m_hIcon; ^SnGcr|a'  
} c]jK Y<  
^44AE5TO  
void CCaptureDlg::OnCancel() .Q FGIAM  
{ ^G'8!!ys  
 if(bTray) -+4:} sD  
  DeleteIcon(); + 5E6|  
  CDialog::OnCancel(); HrQBzS  
} Gy0zh|me  
tU7,nE>p  
void CCaptureDlg::OnAbout() m@o/W  
{ )M(;:#le  
 CAboutDlg dlg; /NFv?~</k  
 dlg.DoModal(); cy|]}n85  
} [/ uqH  
<)c/PI[j  
void CCaptureDlg::OnBrowse() %RA8M- d  
{ kQ4-W9u  
 CString str; /h'V1zL#  
 BROWSEINFO bi; TV)bX  
 char name[MAX_PATH]; ]~~PD?jh  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); wN/d J  
 bi.hwndOwner=GetSafeHwnd(); vfAR^*7e  
 bi.pszDisplayName=name; Y$SZqW0!/  
 bi.lpszTitle="Select folder"; jSVIO v:  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; -U;2 b_  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 0g% `L_e_  
 if(idl==NULL) xI?%.Z;*+  
  return; )G6{JL-I  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); d dB}mk6  
 str.ReleaseBuffer(); q9rY++Tv  
 m_Path=str; z zL@3/<j  
 if(str.GetAt(str.GetLength()-1)!='\\') $%!'c# F  
  m_Path+="\\"; 'Ba Ba=  
 UpdateData(FALSE); !mhV$2&r  
} l;^Id#N  
?)<DEu:Y  
void CCaptureDlg::SaveBmp() Lqy]bnY  
{ gj{2" tE  
 CDC dc; 7+wy`xi  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); C5mq@$6  
 CBitmap bm; 7i?"akr4  
 int Width=GetSystemMetrics(SM_CXSCREEN); lA}(63j+b  
 int Height=GetSystemMetrics(SM_CYSCREEN); RWM9cV5  
 bm.CreateCompatibleBitmap(&dc,Width,Height); GUyMo@g  
 CDC tdc; SYkLia(Ty  
 tdc.CreateCompatibleDC(&dc); KS%LXc('  
 CBitmap*pOld=tdc.SelectObject(&bm); jA@jsv  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); >t_5( K4  
 tdc.SelectObject(pOld); ;]AJ_h(<`  
 BITMAP btm; `8^4,  
 bm.GetBitmap(&btm); ]hY'A>4Uq  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 1fwjW0t  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); SSH))zJ  
 BITMAPINFOHEADER bih; @H%)!f]zWt  
 bih.biBitCount=btm.bmBitsPixel; Zd$a}~4~  
 bih.biClrImportant=0; .$nQD.X  
 bih.biClrUsed=0; f5p>oXo4b  
 bih.biCompression=0; 5~GHAi  
 bih.biHeight=btm.bmHeight; ~)Z{ Yj9)S  
 bih.biPlanes=1; M*ZR+pq,  
 bih.biSize=sizeof(BITMAPINFOHEADER); +o+e*B7Eh  
 bih.biSizeImage=size; +u+|9@  
 bih.biWidth=btm.bmWidth; ;!H<W[  
 bih.biXPelsPerMeter=0; z0=(l?)#  
 bih.biYPelsPerMeter=0; WE;QEA/  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); >2Z0XEe  
 static int filecount=0; :iW+CD)j  
 CString name; -|s w\Q  
 name.Format("pict%04d.bmp",filecount++); AAbI+L0m{  
 name=m_Path+name; MR$R#  
 BITMAPFILEHEADER bfh; 7wKN  
 bfh.bfReserved1=bfh.bfReserved2=0; (C{l4  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 1+wmR4o  
 bfh.bfSize=54+size; %eK=5Er jx  
 bfh.bfOffBits=54; KtTlc#*KU  
 CFile bf; 4^4<Le-G  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ]B8`b  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); er<yB#/;-  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); \YXzq<7  
  bf.WriteHuge(lpData,size); s2SxMFDP  
  bf.Close(); [4p~iGC  
  nCount++; T22 4L.?  
 } _p;>]0cc.  
 GlobalFreePtr(lpData); ;U+4!N  
 if(nCount==1) 4oxAC; L  
  m_Number.Format("%d picture captured.",nCount); Ka\h a  
 else o[$~  
  m_Number.Format("%d pictures captured.",nCount); <Wd#HKIG>l  
  UpdateData(FALSE); EJAk'L+nuH  
} [)efh9P*  
q!L@9&KAQ  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) :V,agAMn  
{ /\7E&n:)2  
 if(pMsg -> message == WM_KEYDOWN) Nuc;Y  
 { AW{"9f4  
  if(pMsg -> wParam == VK_ESCAPE) %:/@1r7o>  
   return TRUE; CG[2  
  if(pMsg -> wParam == VK_RETURN) 38<Z=#S  
   return TRUE; 9w)W|9  
 } y$Nqw9  
 return CDialog::PreTranslateMessage(pMsg); fBj-R~;0  
} \&!qw[;O  
-uk}Fou  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) $O'IbA  
{ qV$\E=%fhM  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 7\0}te  
  SaveBmp(); }Qu kn  
  return FALSE; PTS dW~3  
} VTUY#+3  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){  cFD3  
 CMenu pop; =)c^ik%F&  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); !"d"3coQ?  
 CMenu*pMenu=pop.GetSubMenu(0); Xp67l!{v  
 pMenu->SetDefaultItem(ID_EXITICON); C0K0c6A (4  
 CPoint pt; -~_[2u^3  
 GetCursorPos(&pt); 1m~-q4D)V  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); TSKT6_IJw  
 if(id==ID_EXITICON) -I0J-~#  
  DeleteIcon(); 6*&$ha}X  
 else if(id==ID_EXIT) N^Hj%5  
  OnCancel(); #c%F pR4  
 return FALSE; : L+%5Jq  
} >vPv 4e7&3  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); iSP}kM}  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) goqm6L^Cu  
 AddIcon(); Ur9L8EdC  
 return res; y*#YIS56I  
} j 06 mky  
&cp `? k  
void CCaptureDlg::AddIcon() e>T;'7HSS"  
{ (V x2*Aw]  
 NOTIFYICONDATA data; HO_!/4hrU  
 data.cbSize=sizeof(NOTIFYICONDATA); ;#?G2AAv  
 CString tip; & [z<p  
 tip.LoadString(IDS_ICONTIP); Qv W vS9]  
 data.hIcon=GetIcon(0); vR7S !  
 data.hWnd=GetSafeHwnd(); ]!X[[w)  
 strcpy(data.szTip,tip);  Al1}Ir   
 data.uCallbackMessage=IDM_SHELL; mUNAA[0 L  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; w9w=2 *  
 data.uID=98; (M2hK[  
 Shell_NotifyIcon(NIM_ADD,&data); g#q7~#9  
 ShowWindow(SW_HIDE); o1Krp '*  
 bTray=TRUE; dczq,evp  
} IhHKRb[  
Lz&FywF-l  
void CCaptureDlg::DeleteIcon() G1a56TIN~  
{ D (WdI  
 NOTIFYICONDATA data; H+ 7HD|GE  
 data.cbSize=sizeof(NOTIFYICONDATA); /Un\P   
 data.hWnd=GetSafeHwnd(); < V*/1{  
 data.uID=98; $|tk?Sps  
 Shell_NotifyIcon(NIM_DELETE,&data); skYHPwJdW  
 ShowWindow(SW_SHOW); T#\=v(_NR  
 SetForegroundWindow(); PJO.^OsM  
 ShowWindow(SW_SHOWNORMAL); 7_R[ =t  
 bTray=FALSE; R"y xpw  
} +|--}iE5n  
S.Q:O{]  
void CCaptureDlg::OnChange() A%cJ5dF8~  
{ V aoqI  
 RegisterHotkey(); mT/^F{c  
} 1k]L,CX  
"rrw~  
BOOL CCaptureDlg::RegisterHotkey() {"2Hv;x  
{ o!lKP>  
 UpdateData(); &]tm 'N25  
 UCHAR mask=0; 'ka}x~EF  
 UCHAR key=0; I Z|EPzS  
 if(m_bControl) h1)ny1;  
  mask|=4; D~FIv  
 if(m_bAlt) wRZFBf~ :  
  mask|=2; 5IA3\G}+  
 if(m_bShift) I/%L,XyRI  
  mask|=1; }; R2M  
  key=Key_Table[m_Key.GetCurSel()]; gC F9XKW  
 if(bRegistered){ },{sJ0To  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 4M!wm]n/%5  
  bRegistered=FALSE; 2r!- zEV  
 } b%KcS&-6  
 cMask=mask; [%P[ x]-  
 cKey=key; ?-~<Vc*  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); oVr:ZwkG3  
 return bRegistered; )W6l/  
} (! 8y~n 1  
F-F1^$]k  
  四、小结 ;Ea8>  
/6F\]JwU  
  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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