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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: F vHd `  
  pAc "Wo(Q  
  一、实现方法 W.  p'T}2  
.$"69[1H  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: m/NXifi8l  
4 UnN~  
#pragma data_seg("shareddata") 6q~*\KRk  
HHOOK hHook =NULL; //钩子句柄 F6-U{+KU$!  
UINT nHookCount =0; //挂接的程序数目 iFaC[(1@a  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 aT PmW]w6  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 HH'5kE0;d  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey rfhvdwwD  
static int KeyCount =0; 0vcM+}rw  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 $|}PL[aA#  
#pragma data_seg() 6#1:2ZHKG  
>y iE}  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 XnV$}T:?X  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: Be2yS]U  
"6o5x&H  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR VHTr;(]hk  
cKey,UCHAR cMask) Ixv/xI  
{ 1<3!   
 BOOL bAdded=FALSE; ^ot9Q  
 for(int index=0;index<MAX_KEY;index++){ kIYV%O   
  if(hCallWnd[index]==0){ /&G )IY]g  
   hCallWnd[index]=hWnd; kS$m$ D  
   HotKey[index]=cKey; 'Mm=<Bh  
   HotKeyMask[index]=cMask; Ems0"e  
   bAdded=TRUE; }A'Ro/n  
   KeyCount++; P};GcV-  
   break; dE|luN~  
  } {-)*.l=  
 } PU^@BZ_m  
 return bAdded; y`.m'n7>P  
} xzTF| Z\  
//删除热键 {]dH+J7  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 9U~sRj=D  
{ vP{;'R  
 BOOL bRemoved=FALSE; s+XDtO  
 for(int index=0;index<MAX_KEY;index++){ 6`;+|H<$  
  if(hCallWnd[index]==hWnd){ xEvm>BZi  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ yaKw/vV  
    hCallWnd[index]=NULL; 9!|+GIjn  
    HotKey[index]=0; j\.\ePmk]  
    HotKeyMask[index]=0; ;OfZEy>7  
    bRemoved=TRUE; 6$6Qk !%  
    KeyCount--; u3@v  
    break; )90K^$93"  
   } 6b9 &V`  
  } o!ycVY$yW  
 } ZMI vzQYI  
 return bRemoved; *;y n_zg  
} LX_{39?<{  
E5F0C]hq  
?^H1X-;  
  DLL中的钩子函数如下: F(#~.i  
k=):>}  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) !_SIq`5]@  
{ 1I -LGe[Q  
 BOOL bProcessed=FALSE; \w+a Q?e_  
 if(HC_ACTION==nCode) JOm6Zc  
 { ' 5%`[&  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Jh)K0>R  
   switch(wParam) dT*8I0\+  
   {  &b7i> ()  
    case VK_MENU: gaXKP1m^  
     MaskBits&=~ALTBIT; DRw;.it2  
     break; v5N2$Sqp*  
    case VK_CONTROL: j}$Up7pW  
     MaskBits&=~CTRLBIT; 8x9$6HO  
     break; Om=*b#k  
    case VK_SHIFT: ,t=12R]>  
     MaskBits&=~SHIFTBIT; }^R_8{>k  
     break; XU19+mW=P  
    default: //judge the key and send message ;c;n.o.)/#  
     break; *b >hZkObn  
   } 2>bV+[@B  
   for(int index=0;index<MAX_KEY;index++){ mv+K!T6  
    if(hCallWnd[index]==NULL) U\\nSU  
     continue; 3!V$fl0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9?_ybO~Oq  
    { wuQ>|\Zs  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); _p`@/[(|  
     bProcessed=TRUE; Vt!<.8&`  
    } + $x;FT&  
   } 4/B n9F  
  } 4: <=%d  
  else if((lParam&0xc000ffff)==1){ //有键按下 (s\":5 C  
   switch(wParam) \O7Vo<B&D  
   { MN22#G4j^w  
    case VK_MENU:  j{;RuNt  
     MaskBits|=ALTBIT; GqrOj++>  
     break; |_P-  
    case VK_CONTROL: 1xkU;no  
     MaskBits|=CTRLBIT; qJ|n73yn  
     break; 3koXM_4_{)  
    case VK_SHIFT: C,!}WB@VME  
     MaskBits|=SHIFTBIT; "n3i (sZ  
     break; Ph&fOj=pFb  
    default: //judge the key and send message I:qfB2tL)O  
     break; Q#i^<WUpg  
   } 8zRb)B+  
   for(int index=0;index<MAX_KEY;index++){ P"g Y|}|  
    if(hCallWnd[index]==NULL) kH43 T  
     continue; R;XR?59:.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ?"aj&,q+  
    { BU="BB/[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); O&:0mpRZ  
     bProcessed=TRUE; v^lR]9;  
    } _uO#0 )l  
   } m7XJe[O  
  } 3PonF4  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 .=>T yq  
   for(int index=0;index<MAX_KEY;index++){ UEq;}4Bo  
    if(hCallWnd[index]==NULL) x Qh?  
     continue; jj)9jU z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) LaE;{jY  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); TgaDzF,j{A  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 w jmZ`UMz  
   } _e.b #{=9  
  } ^/W 7Xd(s  
 } )Q\ZYCPOr  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); P#H#@:/3  
} FGOa! G  
{/BEO=8q2  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: \ooqa<_  
L!L/QG|wdf  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 7F-b/AdVq  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); >:]fN61#  
%f;(  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 3D~Fu8Hg1  
@"s\eL,r  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) s\&_Kbw] c  
{ 4[3T%jA  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) fBH&AO$Q  
 { Et'C4od s  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 bIm$7a`T  
  SaveBmp(); 04;y%~,}U/  
  return FALSE; GtO5,d_  
 } F!>K8q  
 …… //其它处理及默认处理 U!a"r8u|8q  
} i&,U);T  
x#0C+cU  
IQ{Xj3;?y  
  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。 ke>\.|HT}  
]@J}f}Mjo  
  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。 8{+~3@T  
U>;itHW/  
  二、编程步骤 `Ik}Xw  
1MJ]Gh]5  
  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"; Re1@2a>  
29ft!R>[  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Xs?7Whc6  
b+p!{  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; ;oFaDTX]  
ga^<_;5<  
  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; K=5_jE^e  
N/?Ms rZw  
  5、 添加代码,编译运行程序。 ]bnxOk  
J+*rjdI  
三、程序代码 3}:pD]`h  
GvzPT2E!  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ] |`gTD6  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) cHsJQU*K6  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ /#G"'U/  
#if _MSC_VER > 1000 jZ D\u%  
#pragma once PYHm6'5BtB  
#endif // _MSC_VER > 1000 qfYb\b  
#ifndef __AFXWIN_H__ hTG d Uw]  
#error include 'stdafx.h' before including this file for PCH Xi{(1o4%  
#endif uBE,z>/,;  
#include "resource.h" // main symbols ?ha}&##  
class CHookApp : public CWinApp .sG,TLE[<  
{ 93WYZNpX  
 public: '6 'XBL?  
  CHookApp(); R-Fi`#PG2  
  // Overrides g?$9~/h :;  
  // ClassWizard generated virtual function overrides Lv^j l  
  //{{AFX_VIRTUAL(CHookApp) !F<?he<U  
 public: b/K&8C,c  
  virtual BOOL InitInstance(); &\X;t|  
  virtual int ExitInstance(); 2@&|hd=-  
  //}}AFX_VIRTUAL KncoIw  
  //{{AFX_MSG(CHookApp) #wjBMR%  
  // NOTE - the ClassWizard will add and remove member functions here. 'j3'n0o  
  // DO NOT EDIT what you see in these blocks of generated code ! w%_BX3GTO  
  //}}AFX_MSG 0 j.Sb2  
  DECLARE_MESSAGE_MAP() Q~@8t"P  
}; g^C6"rsnl  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); *tO<wp&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); *(scSC>  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); \fKE~61  
BOOL InitHotkey(); =0)^![y]v  
BOOL UnInit(); l46F3C|  
#endif zc1Zuco| R  
*=7[Ip< X  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ~JNuy"8  
#include "stdafx.h" +-nQ, fOV  
#include "hook.h" 4AM*KI  
#include <windowsx.h> h[8y$.YsC  
#ifdef _DEBUG S }n;..{  
#define new DEBUG_NEW ~ 9;GD4  
#undef THIS_FILE %pp+V1FH  
static char THIS_FILE[] = __FILE__; l =yHx\  
#endif f lB,_  
#define MAX_KEY 100 vvM)Rb,  
#define CTRLBIT 0x04 84[^#ke  
#define ALTBIT 0x02 7asq]Y}<  
#define SHIFTBIT 0x01 'JMa2/7CG  
#pragma data_seg("shareddata") O$H150,Q  
HHOOK hHook =NULL;  * [5  
UINT nHookCount =0; ^8m+*t  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey cMl%)j-  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT qj6`nbZ{va  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey =eqI]rVj^  
static int KeyCount =0; '/H(,TM  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift eC$v0Gtq  
#pragma data_seg() K*Jtyy}r  
HINSTANCE hins; upDQNG>d  
void VerifyWindow(); Vi#im`@  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) JLu0;XVK  
//{{AFX_MSG_MAP(CHookApp)  {K9E% ,w  
// NOTE - the ClassWizard will add and remove mapping macros here. %-l:_A  
// DO NOT EDIT what you see in these blocks of generated code! =b7&(x  
//}}AFX_MSG_MAP pNlisS  
END_MESSAGE_MAP() !_ Q!H2il  
TyWy5J< :+  
CHookApp::CHookApp() >t2b?(h/x  
{ j>*SJtq7  
 // TODO: add construction code here, wP/9z(US  
 // Place all significant initialization in InitInstance `&_k\/  
} *?D2gaCta  
5uo(z,WLR  
CHookApp theApp; ? ~Zrd  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) F?} *ovy  
{ 8uxFXQ  
 BOOL bProcessed=FALSE; g&T Cff  
 if(HC_ACTION==nCode) j#,M@CE  
 { 0xUj#)  
  if((lParam&0xc0000000)==0xc0000000){// Key up 6wB>-/'Y  
   switch(wParam) j dhml%pAd  
   { Noxz kpMF  
    case VK_MENU: ]zU<=b@  
     MaskBits&=~ALTBIT; 5vi#ItN}|  
     break; :EwA$`/  
    case VK_CONTROL: rp#*uV9;  
     MaskBits&=~CTRLBIT; [7 `Dgnmq  
     break; (eG]Cp@  
    case VK_SHIFT: THgzT\_zq  
     MaskBits&=~SHIFTBIT; $Ds]\j*  
     break; KOEi_9i}  
    default: //judge the key and send message m=\eL~ h  
     break; ** r?    
   } HQ`nq~%&(  
   for(int index=0;index<MAX_KEY;index++){ 2{kfbm-89t  
    if(hCallWnd[index]==NULL) = )l:^+q  
     continue; 0D3+R1>_D  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) [y[v]'  
    { ^P g YP  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); V 1nZ M  
     bProcessed=TRUE; qb> r\bc  
    } gpK_0?%  
   } 3ZL7N$N}7  
  } L +rySP  
  else if((lParam&0xc000ffff)==1){ //Key down 06 Esc^D  
   switch(wParam) H.8CwsfP  
   { b/,!J] W  
    case VK_MENU: FR,#s^kF  
     MaskBits|=ALTBIT; y8*@dRrq  
     break; 0rJ\e  
    case VK_CONTROL: bC4* w O  
     MaskBits|=CTRLBIT; V@n(v\F  
     break; H"GE\  
    case VK_SHIFT: QjjJtKz  
     MaskBits|=SHIFTBIT; , HI%Xn  
     break; h}`&]2|]  
    default: //judge the key and send message BdB`  
     break; 2@m(XT (  
   } *o e0=  
   for(int index=0;index<MAX_KEY;index++) &Wv`AoV  
   { a.}:d30  
    if(hCallWnd[index]==NULL) 'x,GI\;?  
     continue; BRU9LS  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) iWN.3|r  
    { _ U8OIXN  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); C*y6~AYN#  
     bProcessed=TRUE; 4`!  
    } me[J\MJ;w^  
   } 5lHN8k=mm2  
  } w] 5U  
  if(!bProcessed){ mam5 G!$  
   for(int index=0;index<MAX_KEY;index++){ 9u7n/o&8v6  
    if(hCallWnd[index]==NULL) )>/j&>%  
     continue; x#F1@r8R  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) bV )PT`-,  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); *@G(3 n  
   } i_9Cc$Qh<  
  } q(&^9"  
 } #}t 1   
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Ic{'H2~4,  
} ??\*D9rCn  
>xU72l#5  
BOOL InitHotkey() 6Y>,e;R  
{ ^Z-. [Y  
 if(hHook!=NULL){ 3<jAp#bE  
  nHookCount++; 9o_ g_q  
  return TRUE; }/7.+yD  
 } h$aew63  
 else c_-" Qo  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 1%/ NL?8#  
  if(hHook!=NULL) XC7Ty'#"KX  
   nHookCount++; 6_9:Eb=^v!  
  return (hHook!=NULL); qUEd E`B  
} "9U+h2#]  
BOOL UnInit() 7}#*3*]  
{ 'XP>} m  
 if(nHookCount>1){ i)@U.-*5m  
  nHookCount--; EDq$vB  
  return TRUE; ?O<`h~'$+  
 } c#\ah}]Vo  
 BOOL unhooked = UnhookWindowsHookEx(hHook); "UhK]i*@l  
 if(unhooked==TRUE){ 2<y}91N:  
  nHookCount=0; 0.J1!RIK/  
  hHook=NULL; Y-Ziyy  
 } .-('C> @  
 return unhooked; KlVi4.]  
} ( E"&UC[  
 Vp(D|}P  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;1*m} uNz  
{ TdNuD V  
 BOOL bAdded=FALSE; ` x%U  
 for(int index=0;index<MAX_KEY;index++){ {(m+M  
  if(hCallWnd[index]==0){ )){PBT}t]  
   hCallWnd[index]=hWnd; (aDb^(]>  
   HotKey[index]=cKey; 9atjK4+o  
   HotKeyMask[index]=cMask; [ 5CS}FB  
   bAdded=TRUE; 5YTb7M  
   KeyCount++; q:`77  
   break; R/ ALR  
  } ot|N;=ZKo  
 } TRs[~K)n  
 return bAdded; iwG>]:K3  
} N5q}::Odc  
N `,7FI}  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 936Ff*%(l  
{ _L&n&y1+%  
 BOOL bRemoved=FALSE; Y=P9:unG  
 for(int index=0;index<MAX_KEY;index++){ JYZ2k=zh  
  if(hCallWnd[index]==hWnd){ k%EWkM)?  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ,~?A,9?%:  
    hCallWnd[index]=NULL; 8 *4@-3Sx  
    HotKey[index]=0; o|z+!,  
    HotKeyMask[index]=0; ]^iFqQe  
    bRemoved=TRUE; c8^+^.=pX  
    KeyCount--; o/tVcv  
    break; MxM]( ew~7  
   } 8yHq7=  
  } TqENaC#&  
 } 33=Mm/<m$P  
 return bRemoved; 4mEzcwo'  
} SL[rn<x|  
Si#"Wn?|  
void VerifyWindow() U>/<6 Wd  
{ gbYLA a  
 for(int i=0;i<MAX_KEY;i++){ ]*bAF^8i  
  if(hCallWnd!=NULL){ 4^ c!_K&&  
   if(!IsWindow(hCallWnd)){ r/UYC"K3  
    hCallWnd=NULL; Oq #o1>  
    HotKey=0; *e(:["v  
    HotKeyMask=0; 9T8|y]0F  
    KeyCount--; sFbfFUd  
   } %)zk..K{l  
  } fm3(70F\  
 } {F;,7Kn+l  
} whV&qe;sw  
hNH.G(l0  
BOOL CHookApp::InitInstance() Vh 2Bz  
{ [yO=S0 e  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); i?ZA x4D  
 hins=AfxGetInstanceHandle(); 99J+$A1  
 InitHotkey(); zl0;84:H  
 return CWinApp::InitInstance(); mG0L !5  
} /m97CC#+  
S$S_nNq  
int CHookApp::ExitInstance() l*$WX=h6n  
{ IeO-O'^&`  
 VerifyWindow(); a`DWpc~  
 UnInit(); +#0~:&!9  
 return CWinApp::ExitInstance(); ksTzXG8  
} >g>?Y G  
YkSuwx@5_q  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file )V=0IZi  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 1#/6r :  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ I|H,)!Z  
#if _MSC_VER > 1000  ,Qat  
#pragma once [.{^"<Z<  
#endif // _MSC_VER > 1000 =.DTR5(_h  
b2G2c L-(  
class CCaptureDlg : public CDialog _B}9 f  
{ ' Q\@19  
 // Construction ldK>HxM%Z  
 public: A_@I_V$  
  BOOL bTray; <F ew<r2  
  BOOL bRegistered; !IN @i:m  
  BOOL RegisterHotkey(); 7LG+$LEz  
  UCHAR cKey; Z*h43  
  UCHAR cMask; itw{;j   
  void DeleteIcon(); j]>=1Rd0b(  
  void AddIcon(); Og=[4?Kpk  
  UINT nCount;  -H`\? R  
  void SaveBmp(); kQy&I3  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor JfbKf~g  
  // Dialog Data |P>|D+I0  
  //{{AFX_DATA(CCaptureDlg) z* RSMfRW  
  enum { IDD = IDD_CAPTURE_DIALOG }; c& 3#-DNI  
  CComboBox m_Key; h!v/s=8c  
  BOOL m_bControl; R0vww_fz  
  BOOL m_bAlt; \<X2ns@Tf  
  BOOL m_bShift; GYd]5`ri  
  CString m_Path; WK*S4c  
  CString m_Number; h20Hg|   
  //}}AFX_DATA mGO>""<:  
  // ClassWizard generated virtual function overrides 7(NXCAO81  
  //{{AFX_VIRTUAL(CCaptureDlg) #\LZ;&T'N  
 public: l~rb]6E  
  virtual BOOL PreTranslateMessage(MSG* pMsg); <FQFv IKg  
 protected: _PV*lK=  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support _|X7 n~  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); G,=F<TnI'  
  //}}AFX_VIRTUAL )%qtE34`  
  // Implementation Xk?R mU6  
 protected: %&tb9_T)d  
  HICON m_hIcon; Rjq a_hxrS  
  // Generated message map functions I(n }<)eF  
  //{{AFX_MSG(CCaptureDlg) @UO}W_0ZD  
  virtual BOOL OnInitDialog(); U;p e:  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); h8jB=e, H  
  afx_msg void OnPaint(); -6`;},Yr  
  afx_msg HCURSOR OnQueryDragIcon(); wdwp9r  
  virtual void OnCancel(); Yy hny[fa9  
  afx_msg void OnAbout(); };r|}v !~_  
  afx_msg void OnBrowse(); ddoFaQ8  
  afx_msg void OnChange(); 84^[/d;!  
 //}}AFX_MSG IC/Q  
 DECLARE_MESSAGE_MAP() bK4&=#Zh  
}; 6{.J:S9n   
#endif U(*yL-  
s/t11;  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file =!CU $g  
#include "stdafx.h" 5ITq?%{M  
#include "Capture.h" Yb 6q))Y  
#include "CaptureDlg.h" |1Hc&  
#include <windowsx.h> ! Mo`^ t  
#pragma comment(lib,"hook.lib") Y@%`ZPJ  
#ifdef _DEBUG G6Nb{m  
#define new DEBUG_NEW MM gx|"  
#undef THIS_FILE ,{8v4b-  
static char THIS_FILE[] = __FILE__; 5g>wV  
#endif ^N-'xy  
#define IDM_SHELL WM_USER+1 `Mk4sKU\a  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); H^ BYd%-  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ah+j!e  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 'zxoRc-b@N  
class CAboutDlg : public CDialog [zh"x#AyI  
{ uPLErO9Es[  
 public: YeyGN  
  CAboutDlg(); V`bs&5#Sx  
  // Dialog Data LT_iS^&1  
  //{{AFX_DATA(CAboutDlg) sS9%3i/>  
  enum { IDD = IDD_ABOUTBOX }; {G*OR,HN  
  //}}AFX_DATA 3?`"  
  // ClassWizard generated virtual function overrides y@;%Uv&  
  //{{AFX_VIRTUAL(CAboutDlg) ,2,5Odrz  
 protected: 6(KmA-!b(O  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support !h:  Q  
  //}}AFX_VIRTUAL Uc&iZFid2K  
  // Implementation d#>y}H9  
 protected: f Iy]/  
  //{{AFX_MSG(CAboutDlg) >qh?L#Fk  
  //}}AFX_MSG g_z/{1$  
  DECLARE_MESSAGE_MAP() cj g.lzY H  
}; rMp9jG@3   
KDTDJ8  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) kg>>D  
{ H?Jm'\~  
 //{{AFX_DATA_INIT(CAboutDlg) zOB=aG?/  
 //}}AFX_DATA_INIT Cq\I''~8  
} ?KP}#>Ba@  
ROdK8*jL  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) $$1qF"GF  
{ F]_cbM{8/  
 CDialog::DoDataExchange(pDX); |W7rr1]~S  
 //{{AFX_DATA_MAP(CAboutDlg) qZ X/@Yxz  
 //}}AFX_DATA_MAP Tlodn7%",  
} X?o( b/F -  
L*]0"E  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) >oJkJ$|wU  
 //{{AFX_MSG_MAP(CAboutDlg) 1RqgMMJL  
 // No message handlers >/^#Drwb!i  
 //}}AFX_MSG_MAP 0LL c 1t>}  
END_MESSAGE_MAP() k \qiF|B)Z  
2Z/K(J"&J  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) shgAhx  
: CDialog(CCaptureDlg::IDD, pParent) !;3PG9n3|h  
{ 2]WE({P  
 //{{AFX_DATA_INIT(CCaptureDlg) M1!pQC_9  
  m_bControl = FALSE; 7r 0,> 3"  
  m_bAlt = FALSE; .}`hCt08  
  m_bShift = FALSE; A3{0q>CC  
  m_Path = _T("c:\\"); )=^w3y  
  m_Number = _T("0 picture captured."); Q0cRH"!:  
  nCount=0; ga0'zo9K  
  bRegistered=FALSE; Wa'sZ#  
  bTray=FALSE; i7Z=|&  
 //}}AFX_DATA_INIT uT_!'l$fr  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 HY}j!X  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); F n|gVR  
} Lm%GR[tyQ  
Y+-xvx :  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) {nMAm/kyj  
{ -1r2K  
 CDialog::DoDataExchange(pDX); =A!S/;z>  
 //{{AFX_DATA_MAP(CCaptureDlg) P0GeZ02]  
  DDX_Control(pDX, IDC_KEY, m_Key); <7sIm^N  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); d&(_|xq#  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 7Z,/g|s}z  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); HOi C  
  DDX_Text(pDX, IDC_PATH, m_Path); TMVryb  
  DDX_Text(pDX, IDC_NUMBER, m_Number); d"Q |I  
 //}}AFX_DATA_MAP Ufid%T'  
} :@3Wg3N  
v"Jgw;3  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 53OJ-m%a  
//{{AFX_MSG_MAP(CCaptureDlg) #D%ygh=  
 ON_WM_SYSCOMMAND() s(2GFc  
 ON_WM_PAINT() )Y]/^1hx  
 ON_WM_QUERYDRAGICON() r/:%}(7;  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) O8u3y  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) k|E]YvnfG  
 ON_BN_CLICKED(ID_CHANGE, OnChange) !?FK We  
//}}AFX_MSG_MAP ^]c6RE_  
END_MESSAGE_MAP() C!x/ ^gw  
>^_ bD  
BOOL CCaptureDlg::OnInitDialog() FG-L0X  
{ I!: z,t<  
 CDialog::OnInitDialog(); ljJ>;g+  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); F # YPOH  
 ASSERT(IDM_ABOUTBOX < 0xF000); )Hw:E71h2  
 CMenu* pSysMenu = GetSystemMenu(FALSE); }nx=e#[g%2  
 if (pSysMenu != NULL) -w 6 "?  
 { S"2qJ!.u  
  CString strAboutMenu; ,/Cq v   
  strAboutMenu.LoadString(IDS_ABOUTBOX); 5,KWprb  
  if (!strAboutMenu.IsEmpty()) /2uQCw&x-  
  { pBJAaCGm  
   pSysMenu->AppendMenu(MF_SEPARATOR); :`,3h%  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); {padD p  
  } ` $5UHa2/  
 } /!&R9!6 :  
 SetIcon(m_hIcon, TRUE); // Set big icon :14i?4F d  
 SetIcon(m_hIcon, FALSE); // Set small icon }iN2KeLAF  
 m_Key.SetCurSel(0); "4xfrlOc  
 RegisterHotkey(); _D!g4"  
 CMenu* pMenu=GetSystemMenu(FALSE); DPHQ,dkp  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); E+xuWdp.*  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); <,%:   
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); U9d:@9Y  
 return TRUE; // return TRUE unless you set the focus to a control oR#:Nt X@  
} H=MCjh&$q  
x^=M6;:  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) {U11^w1"3  
{ qN| fEO>  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) kJK,6mN  
 { u=l1s1>  
  CAboutDlg dlgAbout; omX?Bl  
  dlgAbout.DoModal(); j . A6S`  
 } o>D  
 else tykB.2f  
 { akuJz  
  CDialog::OnSysCommand(nID, lParam); jx`QB')kX  
 } $ChK]v 6C  
} !Jfs?Hy  
\l#>dq"Y  
void CCaptureDlg::OnPaint() !b|'Vp^U  
{ Vy)hDa[&  
 if (IsIconic()) 0Fr1Ku!  
 { &Vk; VM`5  
  CPaintDC dc(this); // device context for painting rnm03 '{  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); c@m5 ~  
  // Center icon in client rectangle "E=j|q  
  int cxIcon = GetSystemMetrics(SM_CXICON); +SXIZ`  
  int cyIcon = GetSystemMetrics(SM_CYICON); B/uniR^x  
  CRect rect; mry N}  
  GetClientRect(&rect); ><?BqRm+  
  int x = (rect.Width() - cxIcon + 1) / 2; LxN*)[Wb  
  int y = (rect.Height() - cyIcon + 1) / 2; f6=w3RS  
  // Draw the icon P* #8 ZMA<  
  dc.DrawIcon(x, y, m_hIcon); ctmQWrk|B  
 } lT8\}hNI+  
 else ,t$,idcT+  
 { n]CbDbNw7)  
  CDialog::OnPaint(); KU&G;ni2  
 } I0= NaZ7  
} |I8Mk.Z=FA  
mXWTm%'[  
HCURSOR CCaptureDlg::OnQueryDragIcon() Fw4*  
{ ztM<J+  
 return (HCURSOR) m_hIcon; ZDLMMX x>  
} x<(b|2qf  
o,Z{ w"  
void CCaptureDlg::OnCancel() oUDVy_k  
{ zzpZ19"`1  
 if(bTray) eOl KbJU  
  DeleteIcon(); yYJY;".H  
  CDialog::OnCancel(); WPuz]Ty  
} M++0zhS  
,%"xH4d  
void CCaptureDlg::OnAbout() |KCOfVh?|.  
{ *6ZCDm&N  
 CAboutDlg dlg; `i!wq&1g7  
 dlg.DoModal(); !4#"!Md4o  
} pR o s{Uq"  
t@zdm y  
void CCaptureDlg::OnBrowse() H. ,;-  
{ PK6iY7Qp)  
 CString str; 4)-)#`K  
 BROWSEINFO bi; 8}p8r|d!ls  
 char name[MAX_PATH]; FVWfDQ$&v  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 0OZMlt%z  
 bi.hwndOwner=GetSafeHwnd(); *b(wVvz  
 bi.pszDisplayName=name; !F4;_A`X  
 bi.lpszTitle="Select folder"; ,32xcj}j)r  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; hXL|22>w<  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); O_,O,1  
 if(idl==NULL) h^|5|l  
  return; V-W'RunnW  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); :> -1'HC  
 str.ReleaseBuffer(); Se^^E.Z,W  
 m_Path=str; iDb;_?  
 if(str.GetAt(str.GetLength()-1)!='\\') W.}].7}h  
  m_Path+="\\"; 6Z:YT&,f  
 UpdateData(FALSE); 3!9 Z=- tD  
} u:P~j  
eQN.sl5  
void CCaptureDlg::SaveBmp() nS.G~c|  
{ TRvZ  
 CDC dc; qt?*MyfV  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); kEN#u  
 CBitmap bm; LK7Xw3  
 int Width=GetSystemMetrics(SM_CXSCREEN); O12Q8Oj!0  
 int Height=GetSystemMetrics(SM_CYSCREEN); 5 9 2;W-y  
 bm.CreateCompatibleBitmap(&dc,Width,Height); F4I6P  
 CDC tdc; x"B' zP  
 tdc.CreateCompatibleDC(&dc); Ww9;UP'G  
 CBitmap*pOld=tdc.SelectObject(&bm); P_4DGW  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); XX;6 P  
 tdc.SelectObject(pOld); v"lf-c  
 BITMAP btm; UsW5d]i}Y  
 bm.GetBitmap(&btm); ur%$aX)  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; `iixq9xi  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 'imU `zeo  
 BITMAPINFOHEADER bih; khX|" d360  
 bih.biBitCount=btm.bmBitsPixel; F 1W+o?B  
 bih.biClrImportant=0; e<+<lj "  
 bih.biClrUsed=0; M@7Xp)S"  
 bih.biCompression=0; GrI&?=S^  
 bih.biHeight=btm.bmHeight; 7Ua7A  
 bih.biPlanes=1; o#hI5  
 bih.biSize=sizeof(BITMAPINFOHEADER); [1Dm<G u@  
 bih.biSizeImage=size; a|qsQ'1,;  
 bih.biWidth=btm.bmWidth; )iE"Tl  
 bih.biXPelsPerMeter=0; D'i6",Z>  
 bih.biYPelsPerMeter=0; '1+.t$"/tU  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); {w 5Z7s0  
 static int filecount=0; F+aQ $pQ  
 CString name; F8mC?fbK9  
 name.Format("pict%04d.bmp",filecount++); 8C&x MA^  
 name=m_Path+name; ZXXiL#^  
 BITMAPFILEHEADER bfh; \ aKd5@  
 bfh.bfReserved1=bfh.bfReserved2=0; L]bVN)JU  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 9%,;XQ  
 bfh.bfSize=54+size; pM$ @m]  
 bfh.bfOffBits=54; uH{'gd,q8  
 CFile bf; !D:k!  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ MOZu.NmO  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); %J P!{mqj  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); s (PY/{8  
  bf.WriteHuge(lpData,size); 7 `Du5>b8  
  bf.Close(); rxE&fjW  
  nCount++; v*TeTA %  
 } [X"k> Sq  
 GlobalFreePtr(lpData); 2P}I'4C-  
 if(nCount==1) :YvbU Y  
  m_Number.Format("%d picture captured.",nCount); Q<=Y  
 else #x)}29%e#  
  m_Number.Format("%d pictures captured.",nCount); X>3^a'2,E  
  UpdateData(FALSE); 5' \)`  
} i^g~~h F  
w-rOecwFvu  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) htHv&  
{ [m#NfA:h,  
 if(pMsg -> message == WM_KEYDOWN) y^s1t2]%  
 { j#igu#MB*  
  if(pMsg -> wParam == VK_ESCAPE) ^ KOzCLC  
   return TRUE; u4"r>e6 _B  
  if(pMsg -> wParam == VK_RETURN) &o.iUk  
   return TRUE; #v/ry)2Y=  
 } $9H[3OZPVv  
 return CDialog::PreTranslateMessage(pMsg); Gpu_=9vzv  
} {hd-w4"115  
DTy/jaK  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) _S5gcPcF"  
{ Bz:0L1@,4a  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ sp{j!NSL  
  SaveBmp(); 3+ asP&n  
  return FALSE; 2oB?Dn  
} I#c(J  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ rw*M&qg!z  
 CMenu pop; j+0.= #{??  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); VM;g +RRq  
 CMenu*pMenu=pop.GetSubMenu(0); %!wq:~B1  
 pMenu->SetDefaultItem(ID_EXITICON); F@^N|;_2  
 CPoint pt; 8p,>y(o  
 GetCursorPos(&pt); $jcz?vH  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); y:9?P~  
 if(id==ID_EXITICON) |_I[1%&`N  
  DeleteIcon(); s01$fFJgO  
 else if(id==ID_EXIT) Rp eBm#E2  
  OnCancel(); .EzSSU7n)  
 return FALSE; I}%mfojC  
} %*p^$5L<  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Nuq(4Yf1W  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) s((b"{fFb  
 AddIcon(); y4r2}8fi  
 return res; eoL0^cZj  
} %IU4\ZY>  
QX+Y(P`vMK  
void CCaptureDlg::AddIcon() H<z30r/-w  
{ QpJ IDM/  
 NOTIFYICONDATA data; Q'C 4pn@  
 data.cbSize=sizeof(NOTIFYICONDATA); c}'Xoc  
 CString tip; U,d2DAvt  
 tip.LoadString(IDS_ICONTIP); n4R]+&*  
 data.hIcon=GetIcon(0); 2_I+mQ  
 data.hWnd=GetSafeHwnd(); ~QO< B2hS}  
 strcpy(data.szTip,tip); I*9Gb$]=  
 data.uCallbackMessage=IDM_SHELL; 8(uw0~GO  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; =xoBC&u  
 data.uID=98; !8Y3V/)NU  
 Shell_NotifyIcon(NIM_ADD,&data); xpz`))w  
 ShowWindow(SW_HIDE); Pgx+\;w"  
 bTray=TRUE; ~Ji>[#W K  
} 9M nem*  
ID+,[TM`  
void CCaptureDlg::DeleteIcon() |&(H^<+Xp  
{ Ho>p ^p  
 NOTIFYICONDATA data; i(z+a6^@|  
 data.cbSize=sizeof(NOTIFYICONDATA); jigbeHRy  
 data.hWnd=GetSafeHwnd(); z(jU|va{_1  
 data.uID=98; j}"]s/= 6  
 Shell_NotifyIcon(NIM_DELETE,&data); )v};C<  
 ShowWindow(SW_SHOW); :nt}7Dn'  
 SetForegroundWindow(); #'#4hJ*YC  
 ShowWindow(SW_SHOWNORMAL); 01-p `H+  
 bTray=FALSE; M Ey1~h/  
} Fz{o-4  
+6uOg,;  
void CCaptureDlg::OnChange() F6~b#Jz&i  
{ %odw+PhO  
 RegisterHotkey(); p-a]"l+L  
} i4 P$wlO  
@f-0X1C."N  
BOOL CCaptureDlg::RegisterHotkey() |%n|[LP'  
{ ST#PMb'izn  
 UpdateData(); |_!PD$i-  
 UCHAR mask=0; Xx=K?Z?3.  
 UCHAR key=0; KX]-ll  
 if(m_bControl) XL=2wh  
  mask|=4; #cR57=M}  
 if(m_bAlt) }'%$7vL`Ft  
  mask|=2; U9bFUK/z  
 if(m_bShift) K@I+]5E%?  
  mask|=1; "sC$%D<oc  
  key=Key_Table[m_Key.GetCurSel()]; (2n3exx  
 if(bRegistered){ $hC~af6  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); [''=><  
  bRegistered=FALSE; A[K:/tB  
 } ]eY Qio!  
 cMask=mask; \?aOExG I  
 cKey=key; R/yPZO-U  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 4mki&\lw`  
 return bRegistered; =B1`R%t  
} \ro~-n+o  
~Ay  
  四、小结 ER0TY,  
!$g(&  
  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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