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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: //Xz  
  YYkgm:[  
  一、实现方法 7ruWmy;j  
irjHPuhcG  
  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: ]#q$i[Y  
(>P z3 7  
#pragma data_seg("shareddata") a"1LF`  
HHOOK hHook =NULL; //钩子句柄 tEibxE  
UINT nHookCount =0; //挂接的程序数目 qPhVc9D#  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 40-/t*2Ly  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 _nw\ac#*  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey `<Hc,D; p  
static int KeyCount =0; soKR*gJ,  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 E!I4I'  
#pragma data_seg() [!ZYtp?Hf  
D6e<1W  
  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。 Xa&:Hg<  
PM {L}tEQ  
  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: do%.KIk  
5pRVA  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR otP2qAI  
cKey,UCHAR cMask) p4b6TI9;  
{ o9v9 bL+X  
 BOOL bAdded=FALSE; ZQ[s:  
 for(int index=0;index<MAX_KEY;index++){ A+3=OBpkW0  
  if(hCallWnd[index]==0){ `WQpGBS_z_  
   hCallWnd[index]=hWnd; SC2g5i`  
   HotKey[index]=cKey; uuCVI2|  
   HotKeyMask[index]=cMask; a$6pA@7}  
   bAdded=TRUE; >rh<%55P`  
   KeyCount++; _ `7[}M~  
   break; `R$bx 64  
  } %';DBozZ   
 } "M]`>eixL  
 return bAdded; N=:xyv  
} 81wmKqDEs  
//删除热键 +,9Mufh  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) =E8Kacu%  
{ a+\s0Qo<  
 BOOL bRemoved=FALSE;  q0\$wI  
 for(int index=0;index<MAX_KEY;index++){ xtp55"g  
  if(hCallWnd[index]==hWnd){ + V-&?E(  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ I,lzyxRP  
    hCallWnd[index]=NULL; .MRLA G  
    HotKey[index]=0; sM%.=~AN  
    HotKeyMask[index]=0; ]g9n#$|.  
    bRemoved=TRUE; sY'dN_F  
    KeyCount--; ^#2Y4[@  
    break; 9, 792b  
   } ve= nh]N  
  } t]pJt  
 } !E\J`K0_e  
 return bRemoved; TC'^O0aZ_  
} ,Z I"+v  
8~|PZ,oZ  
r yO\$m  
  DLL中的钩子函数如下: zKk2>.  
3J}bI {3  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Ofg-gCF8  
{ b fsTeW+  
 BOOL bProcessed=FALSE; cv["Ps#;`W  
 if(HC_ACTION==nCode) `D%bZ%25c  
 { l8hOryB&  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 `=Hh5;ep  
   switch(wParam) .r?-O{2t  
   {  Ui 7S8c#tH  
    case VK_MENU: .Eg>)  
     MaskBits&=~ALTBIT; nV%1/e"5  
     break; mPxph>o  
    case VK_CONTROL: K/jC>4/c/  
     MaskBits&=~CTRLBIT; 8:,l+[\  
     break; :- ydsR/  
    case VK_SHIFT: [x 5T7=  
     MaskBits&=~SHIFTBIT; \5Jpr'mY5  
     break; vd9><W  
    default: //judge the key and send message Kuy,qZv!"  
     break; /AP@Bhm  
   } _}7N,Cx   
   for(int index=0;index<MAX_KEY;index++){ P-VK=Y1q  
    if(hCallWnd[index]==NULL) ;X! sTs  
     continue; W^q;=D6uh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0t1WvW  
    { W@1Nit-R  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); M yr [  
     bProcessed=TRUE; QOkPliX  
    } 'tp1|n/1  
   } k9.2*+vvg  
  } 5~CHj  
  else if((lParam&0xc000ffff)==1){ //有键按下 `Xnu("w)  
   switch(wParam) x(7K=K']  
   { <5A(rDij  
    case VK_MENU: rm NqS+t  
     MaskBits|=ALTBIT; ewSFB< N  
     break; B]q &?~  
    case VK_CONTROL: 3ADT Yt".  
     MaskBits|=CTRLBIT; TDdFuO'}  
     break; E/9 U0  
    case VK_SHIFT: nW3`Z1kq})  
     MaskBits|=SHIFTBIT; Q uy5H  
     break; AS[cz! >  
    default: //judge the key and send message ;Id%{1  
     break; Aq}]{gfQ1  
   } !j6]k^ra  
   for(int index=0;index<MAX_KEY;index++){ &+=A;Y)  
    if(hCallWnd[index]==NULL) vDz)q  
     continue; `(<XdlOj  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) q-3%.<LL  
    { tB4- of3+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); nM1U=Du  
     bProcessed=TRUE; [XjJsk,  
    } ;=Jj{FoG%  
   } eXWiTi@  
  } \ aQBzEX  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 SY_T\ }  
   for(int index=0;index<MAX_KEY;index++){ .G#S*L  
    if(hCallWnd[index]==NULL) I|,^a|\  
     continue; +Cl(:kfYB  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) |f&)@fUI  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); mF [w-<:.d  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 `UL #g![J  
   } g= k}6"F~  
  } s={AdQ  
 } }kdYR#{s  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); C] qY  
} ~xpU<Pd*  
/Ou`$2H87  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 1+v&SU  
p#) u2^  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); [ /w{,+U  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _9wX8fh3D  
N&U=5c`Q'  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: kXA o+l  
2ixg ix  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) wGD".CS0  
{ r4k =i4  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) qP6]}Aj]  
 { QpwOrxI}  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 /Y:&307q  
  SaveBmp(); @*e|{;X]hy  
  return FALSE; OACRw%J:X{  
 } jt?4raNW  
 …… //其它处理及默认处理 [URo#  
} ~UX@%0%)N  
,y>,?6:>  
Ikql  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 n~l9`4wJY  
~q4KQ&.!  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 &[$qA  
]l7) F-v  
  二、编程步骤 0B#9CxU%  
e`zx#v  
  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"; htX;"R&  
1Y4=D  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 5wYYYo=  
;= ^kTb`X  
  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; ~=91Kxf  
m/RX~,T*v&  
  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; u :AKp<'  
GTL gj'B  
  5、 添加代码,编译运行程序。 ]Ir{9EE v  
nf=*KS\v  
三、程序代码 /8(c^  
X-2rC  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL wZB:7E%  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) gsFyZ  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ b5K6F:D22  
#if _MSC_VER > 1000 A2>rS   
#pragma once IlQNo 1  
#endif // _MSC_VER > 1000 Otq`45  
#ifndef __AFXWIN_H__ ^f*}]`S  
#error include 'stdafx.h' before including this file for PCH Cq\1t  
#endif zj:= 9$  
#include "resource.h" // main symbols ; ^+#  
class CHookApp : public CWinApp ZI.;7G@|  
{ !kCMw%[  
 public: @!k\Ivd  
  CHookApp(); Tj5G /H>   
  // Overrides ?4>uGaU\  
  // ClassWizard generated virtual function overrides MO}J  
  //{{AFX_VIRTUAL(CHookApp) N6K%Wkz  
 public: s}"5uDfn1F  
  virtual BOOL InitInstance(); }xhat,9  
  virtual int ExitInstance(); &%J+d"n(  
  //}}AFX_VIRTUAL i T* !3  
  //{{AFX_MSG(CHookApp) !;Hi9,<#7g  
  // NOTE - the ClassWizard will add and remove member functions here. 1K(a=o[Ce  
  // DO NOT EDIT what you see in these blocks of generated code ! WZ}je!82  
  //}}AFX_MSG i>=d7'oR  
  DECLARE_MESSAGE_MAP() 0LI:R'P+P[  
}; "s[Y$!#  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); fpMnA  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); F.;G6  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 6 0C;J!D  
BOOL InitHotkey(); W?+U%bIZ9  
BOOL UnInit(); VjZ_L_U}  
#endif ?l\1n,!:8  
}mGOEG|F2  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. gkxEy5c[  
#include "stdafx.h" oL?[9aww  
#include "hook.h" .-kqt^Gc  
#include <windowsx.h> a2:Tu  
#ifdef _DEBUG *7`N^e  
#define new DEBUG_NEW 'Na \9b(  
#undef THIS_FILE / D9FjOP  
static char THIS_FILE[] = __FILE__; JGmW>mH  
#endif &5 *)r@+  
#define MAX_KEY 100 5fh@nR  
#define CTRLBIT 0x04 re.%$D@  
#define ALTBIT 0x02 ~&E|;\G  
#define SHIFTBIT 0x01 3F%Q q7v  
#pragma data_seg("shareddata") .aRL'1xHl  
HHOOK hHook =NULL; Salu[)+?  
UINT nHookCount =0; ]mU,y$IQ  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey tE)%*z@<Lt  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT WIwbf|\  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey )B d`N^k+  
static int KeyCount =0; Q@3.0Hf|{  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift #=WDJ T:  
#pragma data_seg() X,- ' v[z  
HINSTANCE hins; K#"@nVWJ.m  
void VerifyWindow(); lYd#pNN  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ?FRR";  
//{{AFX_MSG_MAP(CHookApp) M/U$x /3K  
// NOTE - the ClassWizard will add and remove mapping macros here. {Y5h*BD>  
// DO NOT EDIT what you see in these blocks of generated code! 1SBc:!2  
//}}AFX_MSG_MAP &`rV{%N"  
END_MESSAGE_MAP() ?KxI|os  
B0c}5V  
CHookApp::CHookApp() Ow\9vf6H  
{ kO<`RHlX=  
 // TODO: add construction code here, lwH&4K  
 // Place all significant initialization in InitInstance <$liWAGX\  
} hp(n;(OR  
}iy`Ko+B"b  
CHookApp theApp;  w'=#7$N  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Q6S[sTKR  
{ PMZdz>>T  
 BOOL bProcessed=FALSE; u)P$xkf  
 if(HC_ACTION==nCode) a@@!Eg A  
 { <.3@-z>w2,  
  if((lParam&0xc0000000)==0xc0000000){// Key up TJY$<:  
   switch(wParam) Fm}O,=  
   { yZ&By?.0  
    case VK_MENU: i:#R U^R  
     MaskBits&=~ALTBIT; 4x'^?0H@  
     break; 6\86E$f=h  
    case VK_CONTROL: >ge-yK 1  
     MaskBits&=~CTRLBIT; e:[ Kp6J  
     break; "!)8bTW  
    case VK_SHIFT: s)=L6t^a6  
     MaskBits&=~SHIFTBIT; HqgTu`  
     break; NQfIY`lt'  
    default: //judge the key and send message _| 8"&*T^  
     break; jn\\,n"6  
   } :&)RK~1m_  
   for(int index=0;index<MAX_KEY;index++){ :yT~.AK}>1  
    if(hCallWnd[index]==NULL) 7k6rhf7H  
     continue; dab>@z4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ](_(1  
    { q\#3G  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); jo<sN  
     bProcessed=TRUE; #bu`W!p}  
    } cD s#5,  
   } ^Hq}9OyS9  
  } C,PCU<q  
  else if((lParam&0xc000ffff)==1){ //Key down >^J!Z~;L)  
   switch(wParam) n]Dq  
   { aDZLabRu  
    case VK_MENU: bf;IJ|v^  
     MaskBits|=ALTBIT; tu!u9jVv  
     break; wuYo@DDU#  
    case VK_CONTROL: ?7&VT1  
     MaskBits|=CTRLBIT; D'nV &m  
     break; Xkv>@7ec  
    case VK_SHIFT: qE,%$0g  
     MaskBits|=SHIFTBIT; Jy|Mfl%d  
     break; q }z,C{Wq<  
    default: //judge the key and send message r LfS9H  
     break; j|aT`UH03  
   } W)4xO>ck*3  
   for(int index=0;index<MAX_KEY;index++) Y6N+,FAk+J  
   { u|:VQzPd-  
    if(hCallWnd[index]==NULL) }p- %~ Y  
     continue; v>R.M"f  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ]ipVN  
    { kT$4X0}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); r*p%e\ 3  
     bProcessed=TRUE; ' xi..  
    } l%w7N9  
   } (u'/tNGS  
  } S i>TG  
  if(!bProcessed){ `GDYL7pM(  
   for(int index=0;index<MAX_KEY;index++){ v'@LuF'e8  
    if(hCallWnd[index]==NULL) sN?:9J8  
     continue; blPC"3}3Vd  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) $OhL 95}7  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); "Q J-IRt &  
   } R;.WOies4  
  } rFK *  
 } hWW<]qzA,  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); U&/S  
} .z4FuG,R  
Qp?+_<{  
BOOL InitHotkey() UD(#u3z  
{ uJ y@  
 if(hHook!=NULL){ :OZhEBL&b  
  nHookCount++; r 1a{Y8?  
  return TRUE; DtS{iH=s]  
 } A&7jE:Ew  
 else 3//v{ce1]  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); K;ML'  
  if(hHook!=NULL) ;C<A }  
   nHookCount++; !Yf0y;e|:  
  return (hHook!=NULL); #e=^-yE  
} od fu7P_  
BOOL UnInit() -XyuA:pxx  
{ Lgfr"{C  
 if(nHookCount>1){ )5v .9N 6v  
  nHookCount--; Fo=6A[J  
  return TRUE; 9|m  L  
 } ~>R)H#mP7  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 0A9cu,ZdUR  
 if(unhooked==TRUE){ z~5'p(|@f  
  nHookCount=0; *~L]n4-  
  hHook=NULL; cOgtBEhn  
 } (Vv]:Y]  
 return unhooked; 19t*THgq  
} yB1>83!q  
[ub\DLl  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) *2MTx   
{ Z#O3s:`  
 BOOL bAdded=FALSE; }+J@;:  
 for(int index=0;index<MAX_KEY;index++){ :JIPF=]fc  
  if(hCallWnd[index]==0){ ( -@>  
   hCallWnd[index]=hWnd; $C/Gn~k 5  
   HotKey[index]=cKey; BxU1Q&  
   HotKeyMask[index]=cMask; (I.`bR  
   bAdded=TRUE; s`YuH <8  
   KeyCount++; SI9hS4<j  
   break; QEKFuY<E+  
  } Se`N5hQ  
 } lg+g:o  
 return bAdded; $ZO<8|bW  
} B vc=gW  
K;y\ &'E  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 2A|6o*s"  
{ {SJ7Yfs  
 BOOL bRemoved=FALSE; &:*+p-!2<  
 for(int index=0;index<MAX_KEY;index++){ :nUsC+oBS  
  if(hCallWnd[index]==hWnd){ !.$P`wKr  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ dCTpO  
    hCallWnd[index]=NULL; uLljM{ I  
    HotKey[index]=0; G{~p.?f:  
    HotKeyMask[index]=0; Wp3l>:  
    bRemoved=TRUE; 2*YXm>|1  
    KeyCount--; V2%wb\_z  
    break; Z-a(3&  
   } v6\2m c.  
  } #.YcIR)  
 } 2kq@*}ys  
 return bRemoved; y(h(mr  
} m0\}Cc  
E}/|Lja  
void VerifyWindow() }{oBKm9_p  
{ RgA4@J#  
 for(int i=0;i<MAX_KEY;i++){  7`@?3?  
  if(hCallWnd!=NULL){ em!R9J.  
   if(!IsWindow(hCallWnd)){ >%dAqYi $  
    hCallWnd=NULL; gGml c:/J%  
    HotKey=0; Jjh!/pWZ4  
    HotKeyMask=0; e*6` dz@  
    KeyCount--; F5[ITK]A4  
   } g 'a?  
  } EoR6Rx@Z  
 } 'OW"*b  
} Atq2pL"  
6_K#,_oZ  
BOOL CHookApp::InitInstance() bk9~63tN+>  
{ -0WCwv  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); pbxcsA\  
 hins=AfxGetInstanceHandle(); '/gwC7*-&  
 InitHotkey(); u!Nfoq&'u  
 return CWinApp::InitInstance(); [mzF)/[_2  
} <?7,`P:h[  
'=G Ce%A  
int CHookApp::ExitInstance() p<fgUVR  
{ B5H&DqWzr  
 VerifyWindow(); C{i;spc!bi  
 UnInit(); &~A*(+S  
 return CWinApp::ExitInstance(); Q <-%jBP  
} }\L !;6oy  
#L= eK8^e  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file lrX0c$)  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) }d\Tk(W  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ xXxh3 k\  
#if _MSC_VER > 1000 nC.2./OwMf  
#pragma once S Ljf<.S  
#endif // _MSC_VER > 1000 RHl=$Hm.%  
_u|FJTk  
class CCaptureDlg : public CDialog c[RL Yu  
{ zM r!WoW  
 // Construction -YjgS/g  
 public: 3?Eoj95w!  
  BOOL bTray; tvH\iS#V  
  BOOL bRegistered; |}p}`Mb)a  
  BOOL RegisterHotkey(); eQax ZMU  
  UCHAR cKey; ]v\egfW,W  
  UCHAR cMask; ;, v L  
  void DeleteIcon(); ]\ 2RV DC  
  void AddIcon(); O][Nl^dl  
  UINT nCount; "3i80R\w`F  
  void SaveBmp(); fxoi<!|iGY  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor X})Imk7&E  
  // Dialog Data #DK3p0d  
  //{{AFX_DATA(CCaptureDlg) mh#FY Sp  
  enum { IDD = IDD_CAPTURE_DIALOG }; 6;[/ 9  
  CComboBox m_Key; Ds%&Mi  
  BOOL m_bControl; uJam $V  
  BOOL m_bAlt; it\DZGsg  
  BOOL m_bShift; \aVY>1`  
  CString m_Path; KW|\)83$  
  CString m_Number; 8lWH=kA\  
  //}}AFX_DATA {`H<=h__  
  // ClassWizard generated virtual function overrides 95^i/6Gl!P  
  //{{AFX_VIRTUAL(CCaptureDlg) qQxA@kdd  
 public: 7{An@hNh  
  virtual BOOL PreTranslateMessage(MSG* pMsg); U7B/t3,=U  
 protected: "rx^M*"  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support y3cf[Q  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); QOV}5 0  
  //}}AFX_VIRTUAL R{) Q1~H=q  
  // Implementation ) Kc%8hBv  
 protected: Ob8B  
  HICON m_hIcon; Z6^QB@moj  
  // Generated message map functions cZgMA8 F  
  //{{AFX_MSG(CCaptureDlg) 7Y32p'  
  virtual BOOL OnInitDialog(); HUJ|-)"dw  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); a;"Uz|rz  
  afx_msg void OnPaint(); &@% b?~  
  afx_msg HCURSOR OnQueryDragIcon(); Ts(t:^  
  virtual void OnCancel(); ?L@@;tt  
  afx_msg void OnAbout(); `k(u:yGK  
  afx_msg void OnBrowse(); ok`]:gf  
  afx_msg void OnChange(); (S  k#x  
 //}}AFX_MSG pd4cg?K  
 DECLARE_MESSAGE_MAP() B f5&}2u  
}; &:V@2_6"  
#endif 4!l sk:R  
8FzHNG  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file N5nvL)a~  
#include "stdafx.h" E@w[&#  
#include "Capture.h" r^$\t0h(U8  
#include "CaptureDlg.h" #B @X  
#include <windowsx.h> 1GtOA3,~;-  
#pragma comment(lib,"hook.lib") "~u_\STn <  
#ifdef _DEBUG  ~~PgF"v  
#define new DEBUG_NEW 8HMo.*Ti9  
#undef THIS_FILE ?75\>NiR  
static char THIS_FILE[] = __FILE__; u]HS(B,ht  
#endif ngP7'1I  
#define IDM_SHELL WM_USER+1 I[#U`9Dt  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); coDj L.u  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); [?-]PZ  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; nV'3sUvR#  
class CAboutDlg : public CDialog RCzV5g  
{ ><[| G9  
 public: '/k^C9~m r  
  CAboutDlg(); >):m-I  
  // Dialog Data #wF1  
  //{{AFX_DATA(CAboutDlg) n ]w7Zj  
  enum { IDD = IDD_ABOUTBOX }; (@ "=F6P  
  //}}AFX_DATA o]A XT8  
  // ClassWizard generated virtual function overrides J' W}7r  
  //{{AFX_VIRTUAL(CAboutDlg)  }mKwFVZ  
 protected: L?!$EPr  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support zLP],wB  
  //}}AFX_VIRTUAL 80Ag  
  // Implementation RcQ>eZHl  
 protected: r*chL&7  
  //{{AFX_MSG(CAboutDlg) c15r':.5  
  //}}AFX_MSG c<?[d!vI  
  DECLARE_MESSAGE_MAP() I~)cYl:|G  
}; Pey//U  
x=.tiM{#  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) P*YK9Hl<  
{ L1wZU,o  
 //{{AFX_DATA_INIT(CAboutDlg) Txo@ U  
 //}}AFX_DATA_INIT [ByQ;s5tY  
} g5y;?fqJ  
hT'=VN  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) G+VD8]!K1  
{ qgx?"$ Z  
 CDialog::DoDataExchange(pDX); # ORO&78  
 //{{AFX_DATA_MAP(CAboutDlg) zI^Da!r.  
 //}}AFX_DATA_MAP M;KA]fmc  
} ]9*;;4M g  
(bv,02  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ^/dS>_gtHv  
 //{{AFX_MSG_MAP(CAboutDlg) i.y=8GxY  
 // No message handlers mibpG9+d  
 //}}AFX_MSG_MAP o>F*Itr{  
END_MESSAGE_MAP() %v{1# ~u  
ZYcd.?:6  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 3?.1n Gu  
: CDialog(CCaptureDlg::IDD, pParent) J R$r!hX  
{ Y%Ieg.o  
 //{{AFX_DATA_INIT(CCaptureDlg) ]\Xc9N8w  
  m_bControl = FALSE; ``u:lL  
  m_bAlt = FALSE; }mZV L~|V  
  m_bShift = FALSE; ;Lo&}U3F,!  
  m_Path = _T("c:\\"); $*\L4<(  
  m_Number = _T("0 picture captured."); 7LCp7$Cp  
  nCount=0; gg^1b77hT  
  bRegistered=FALSE; eEl.. y  
  bTray=FALSE; vfwA$7N  
 //}}AFX_DATA_INIT v+=k-;-  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 (UYF%MA}"  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Qx)Jtb0`V  
} ;AIc?Cg  
p!zJ;rh)  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) >MG(qi  
{ B$vr'U   
 CDialog::DoDataExchange(pDX); QA;!caNp  
 //{{AFX_DATA_MAP(CCaptureDlg) {6G?[ `&ca  
  DDX_Control(pDX, IDC_KEY, m_Key); yGj.)$1},@  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Xsuwa-G!5~  
  DDX_Check(pDX, IDC_ALT, m_bAlt); *5V Xyt2  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 8)yI<`q6  
  DDX_Text(pDX, IDC_PATH, m_Path); &:5\"b  
  DDX_Text(pDX, IDC_NUMBER, m_Number); %Dig)<yx  
 //}}AFX_DATA_MAP /6+NU^  
} -$2kO`|p  
'5KeL3J;  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 5x8+xw3Eh  
//{{AFX_MSG_MAP(CCaptureDlg) D@oCP =m<  
 ON_WM_SYSCOMMAND() hBU\'.x  
 ON_WM_PAINT() k`{7}zxS  
 ON_WM_QUERYDRAGICON() NbRn*nb/T  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) a W%5~3  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) x=Hndx^  
 ON_BN_CLICKED(ID_CHANGE, OnChange) M@Q3M(z  
//}}AFX_MSG_MAP kAA>FI6  
END_MESSAGE_MAP() w ej[+y-  
od' /%  
BOOL CCaptureDlg::OnInitDialog() 9uk<&nqx  
{ SHVWwoieT  
 CDialog::OnInitDialog(); _-TA{21)  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); e8=YGx^o`  
 ASSERT(IDM_ABOUTBOX < 0xF000); Z{6kWA3Kk  
 CMenu* pSysMenu = GetSystemMenu(FALSE); DGW+>\G  
 if (pSysMenu != NULL) ;V^pL((5J  
 { xv{O^Ie+S  
  CString strAboutMenu; hpTDxh'?$C  
  strAboutMenu.LoadString(IDS_ABOUTBOX); tE6!+c<7  
  if (!strAboutMenu.IsEmpty()) sJwyj D$b  
  { g~V+4+  
   pSysMenu->AppendMenu(MF_SEPARATOR); No]~jnqDM  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 7dsefNPb  
  } ^7zu<lX  
 } rc&%m  
 SetIcon(m_hIcon, TRUE); // Set big icon <)+y=m\eJ  
 SetIcon(m_hIcon, FALSE); // Set small icon (=D&A<YX  
 m_Key.SetCurSel(0); gs!(;N\j|  
 RegisterHotkey(); Oo kh<ES>  
 CMenu* pMenu=GetSystemMenu(FALSE); `Al;vVMRO  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); [Nn`l,  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Eu"_MgD  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); pTIf@n6I  
 return TRUE; // return TRUE unless you set the focus to a control ODZ|bN0>  
} lHgs;>U$  
%HrAzM.QBF  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) F:x [  
{ %|s+jeUDn|  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Ua!aaq&  
 { ]_N|L|]M  
  CAboutDlg dlgAbout; >/|q:b^2r  
  dlgAbout.DoModal(); bygx]RC[  
 } 8WnwQ%;m?  
 else P.gb 1$7<  
 { 8OgLn?"P  
  CDialog::OnSysCommand(nID, lParam); !47n[Zs  
 } wI(M^8F_Mf  
} iLSr*` o  
x7O-Y~[2  
void CCaptureDlg::OnPaint() AK@9?_D  
{ F$)[kP,wtO  
 if (IsIconic()) Y]&j,j&  
 { Bz,?{o6s)Q  
  CPaintDC dc(this); // device context for painting EFz&N\2  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 4:FK;~wM&x  
  // Center icon in client rectangle V:y'Qf2M  
  int cxIcon = GetSystemMetrics(SM_CXICON); ]q4rlT.i  
  int cyIcon = GetSystemMetrics(SM_CYICON); @;"|@!l|  
  CRect rect; WlU0:(d  
  GetClientRect(&rect); q<M2,YrbAI  
  int x = (rect.Width() - cxIcon + 1) / 2; a |X a3E  
  int y = (rect.Height() - cyIcon + 1) / 2; &v@a5L  
  // Draw the icon 7'Mm205\  
  dc.DrawIcon(x, y, m_hIcon); |p,P46I  
 } ~sh`r{0  
 else }~L.qG  
 { [@.!~E)P  
  CDialog::OnPaint(); o2F)%TDY  
 } J\b^)  
} YuO.yh_  
ln6d<; M5  
HCURSOR CCaptureDlg::OnQueryDragIcon() I`!<9OTBj  
{ %$.3V#?  
 return (HCURSOR) m_hIcon; NPp;78O0[  
} JJN.ugT}1  
vQ 6^xvk]  
void CCaptureDlg::OnCancel() n"c[,k+R`U  
{ glDu2a,Q  
 if(bTray) 8)_XJ"9)G  
  DeleteIcon(); _z|65H  
  CDialog::OnCancel(); Tw-;7Ae  
} nWw":K<@Q_  
Hquc o  
void CCaptureDlg::OnAbout() v bZ}Z3f_  
{ {'NvG  
 CAboutDlg dlg; V2wb%;q  
 dlg.DoModal(); s Z].8.  
} m;GCc8  
AP 2_MV4W  
void CCaptureDlg::OnBrowse() 9y"@(  
{ iv J@=pd)B  
 CString str; !Wntd\w  
 BROWSEINFO bi; V_.5b&@  
 char name[MAX_PATH]; t.i 8 2Q  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); tEvut=k'  
 bi.hwndOwner=GetSafeHwnd(); 12b(A+M   
 bi.pszDisplayName=name; MP Y[X[  
 bi.lpszTitle="Select folder"; TNe l/   
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ;n*.W|Uph  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); TrEu'yxy8*  
 if(idl==NULL) a%JuC2  
  return; NJWA3zz   
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Z>k#n'm^z  
 str.ReleaseBuffer(); *av<E  
 m_Path=str; 98IJu  
 if(str.GetAt(str.GetLength()-1)!='\\') /NI;P]s.  
  m_Path+="\\"; |4;Fd9q^m  
 UpdateData(FALSE); U ]H#MiC!  
} 4DI8s4fi  
"c%0P"u  
void CCaptureDlg::SaveBmp() 7rc0yB  
{ :+^lJ&{U  
 CDC dc; _{YWXRC#  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); M=@:ZQ^!  
 CBitmap bm; N2^=E1|_  
 int Width=GetSystemMetrics(SM_CXSCREEN);  MzdV2.  
 int Height=GetSystemMetrics(SM_CYSCREEN); ] vHF~|/-  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ;#W2|'HD  
 CDC tdc; u5`u>.!  
 tdc.CreateCompatibleDC(&dc); H(ARw'M  
 CBitmap*pOld=tdc.SelectObject(&bm); fgp]x&5Q  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY);  ?Jm^<  
 tdc.SelectObject(pOld); v!~fs)cdE|  
 BITMAP btm; Y8~"vuIE5  
 bm.GetBitmap(&btm); iy.p n  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; {L{o]Ii?g  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); s%7t"-=&  
 BITMAPINFOHEADER bih; ,wb:dj-  
 bih.biBitCount=btm.bmBitsPixel; G5BfNU  
 bih.biClrImportant=0; O3,jg |,  
 bih.biClrUsed=0; <`=j^LU  
 bih.biCompression=0; e'NJnPO  
 bih.biHeight=btm.bmHeight; gD @){Ip  
 bih.biPlanes=1; w,.TTTad  
 bih.biSize=sizeof(BITMAPINFOHEADER); n:?a$Ldgm  
 bih.biSizeImage=size; |tH4:%Q'  
 bih.biWidth=btm.bmWidth; 0 1rK8jX  
 bih.biXPelsPerMeter=0; Jq-]7N%k/  
 bih.biYPelsPerMeter=0; F0TB<1  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); <dtGK~_  
 static int filecount=0; >1Ibc=}g  
 CString name; /{ g>nzP  
 name.Format("pict%04d.bmp",filecount++); .W%)*&WH\  
 name=m_Path+name; h7Kzq{$  
 BITMAPFILEHEADER bfh; P/eeC"  
 bfh.bfReserved1=bfh.bfReserved2=0; +~$ ]} %  
 bfh.bfType=((WORD)('M'<< 8)|'B'); sY&IquK^  
 bfh.bfSize=54+size; 77f9(~ZnT  
 bfh.bfOffBits=54; |0b`fOS  
 CFile bf; kgP0x-Ap  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ r),kDia  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); vpr.Hn  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); jV1.Yz (`  
  bf.WriteHuge(lpData,size); 14yv$,  
  bf.Close(); m<Dy<((_I  
  nCount++; ea 'D td  
 } }&J q}j  
 GlobalFreePtr(lpData); 'zTLl8P  
 if(nCount==1) dUZ ,m9u  
  m_Number.Format("%d picture captured.",nCount); (hbyEQhF  
 else V**~m9f  
  m_Number.Format("%d pictures captured.",nCount); ?N9uu4  
  UpdateData(FALSE); + =</&Tm  
} /nA{#HY  
h*](a_0  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) on `3&0,.  
{ m;QMQeGz  
 if(pMsg -> message == WM_KEYDOWN) eD6fpe\(  
 { lRFYx?y  
  if(pMsg -> wParam == VK_ESCAPE) %IWPM"  
   return TRUE; Tyx_/pJT  
  if(pMsg -> wParam == VK_RETURN) NC(~l  
   return TRUE; XW] tnrs  
 } 2P0*NQ   
 return CDialog::PreTranslateMessage(pMsg); @\#td5'  
} -[.[>&`/  
3 Za}b|  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) jNk%OrP]  
{ VMWf>ZU  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ XwaXdvmK  
  SaveBmp(); ]}Yl7/gM1}  
  return FALSE; UJ   
} <RL]  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ^ [@ ,  
 CMenu pop; T6=u P)!K  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 5=ryDrx  
 CMenu*pMenu=pop.GetSubMenu(0); Q\Vgl(;lX  
 pMenu->SetDefaultItem(ID_EXITICON); E7hY8#G  
 CPoint pt; 61U09s%\0  
 GetCursorPos(&pt); F:S}w   
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 5nx1i  
 if(id==ID_EXITICON) {)sdiE  
  DeleteIcon(); tKXIk9e  
 else if(id==ID_EXIT) j0q&&9/Jj  
  OnCancel(); #%O0[kd  
 return FALSE; 5v*\Zr5ha  
} dSHDWu&  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); o ^uA">GH  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) SOIN']L|V[  
 AddIcon(); KMax$  
 return res; G 01ON0  
} YN5rml'-  
"" EQE>d  
void CCaptureDlg::AddIcon() xyXa .  
{ =?8@#]G+  
 NOTIFYICONDATA data; 5[0?g@aO  
 data.cbSize=sizeof(NOTIFYICONDATA); "#g}ve,  
 CString tip; Wx#;E9=Im  
 tip.LoadString(IDS_ICONTIP); 'V>-QD%1  
 data.hIcon=GetIcon(0); {P-):  
 data.hWnd=GetSafeHwnd(); \Vk:93OH21  
 strcpy(data.szTip,tip);  Nz-&MS  
 data.uCallbackMessage=IDM_SHELL; *0ro0Z|Iq  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; yB!dp;gM{  
 data.uID=98; uQzXfOq  
 Shell_NotifyIcon(NIM_ADD,&data); !8 b ^,  
 ShowWindow(SW_HIDE); 3OB"#Ap8<  
 bTray=TRUE; 4skD(au8  
} izR"+v  
F"mmLao  
void CCaptureDlg::DeleteIcon() n=q 76W\  
{ e'<)V_  
 NOTIFYICONDATA data; o+VQ\1as?(  
 data.cbSize=sizeof(NOTIFYICONDATA); yt2PU_),  
 data.hWnd=GetSafeHwnd(); W%w~ah|/]  
 data.uID=98; TcoB,Kdce  
 Shell_NotifyIcon(NIM_DELETE,&data); 2`-Bs  
 ShowWindow(SW_SHOW); ),!qTjD  
 SetForegroundWindow(); 5lum$5  
 ShowWindow(SW_SHOWNORMAL); @(lh%@hO  
 bTray=FALSE; d_P` qA  
} !n%j)`0M  
`GLx#=Q  
void CCaptureDlg::OnChange() Tj- s4x  
{ 3(UVg!t  
 RegisterHotkey(); wgA_38To  
} jiC>d@~y  
H"F29Pu2  
BOOL CCaptureDlg::RegisterHotkey() #LNED)Vg  
{ qJw_  
 UpdateData(); tl>7^hH  
 UCHAR mask=0; ss-D(K"  
 UCHAR key=0; 2t,zLwBdnJ  
 if(m_bControl) eV~goj  
  mask|=4; Q59W#e)  
 if(m_bAlt) wKHBAW[i]  
  mask|=2; `F6C-  
 if(m_bShift) fc@A0Hf  
  mask|=1; Y9|!+,  
  key=Key_Table[m_Key.GetCurSel()]; e';_Y>WQy  
 if(bRegistered){ B/C,.?Or  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); wA.\i  
  bRegistered=FALSE; 3uMy]HUQ  
 } g,Y/M3>(  
 cMask=mask; tnIX:6  
 cKey=key; |cY`x(?yP  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); xezcAwW  
 return bRegistered; azU"G(6y?+  
} A)KZa"EX  
\Og+c%  
  四、小结 jFb?b6b  
9>$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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