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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: j^:\a\-1  
  aiUn bP  
  一、实现方法 %K?~$;Z.  
u;y1leG  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: 9KCnitU  
<w08p*?  
#pragma data_seg("shareddata") At.WBa3j%{  
HHOOK hHook =NULL; //钩子句柄 CYG'WFvZZ  
UINT nHookCount =0; //挂接的程序数目 >e8 t  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 @bS>XWI>  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 #F[6$. Gr  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Cc9<ABv?  
static int KeyCount =0; Bg;bBA!L  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 R%SsHu">  
#pragma data_seg() QZ h|6&yI  
^oaG.)3  
  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。 NOo&5@z;H  
TlAY=JwW  
  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: m;8_A|$A  
cLJ|VD7  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR W~R_- ]k@g  
cKey,UCHAR cMask) 2<YHo{0BLS  
{ lD\lFN(:  
 BOOL bAdded=FALSE; (S1$g ~t;  
 for(int index=0;index<MAX_KEY;index++){ m_U__CZ}Tt  
  if(hCallWnd[index]==0){ XWk/S $-d  
   hCallWnd[index]=hWnd; -%"MAIJnX  
   HotKey[index]=cKey; )HR'FlxOd  
   HotKeyMask[index]=cMask; p5>TL!4M  
   bAdded=TRUE; mN*9X[ >x  
   KeyCount++; Sd}fse  
   break; B*K%&w10~  
  } : 8(~{<R  
 } o"TEmZUP  
 return bAdded; Y`\zLX"_m  
} IjD: hR@  
//删除热键 -N*g|1rpa  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) tz._*n83  
{ CuU"s)  
 BOOL bRemoved=FALSE; C$M^<z  
 for(int index=0;index<MAX_KEY;index++){ '$l*FWOEal  
  if(hCallWnd[index]==hWnd){ (w@|:0t^y[  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ W:hR8 1ci  
    hCallWnd[index]=NULL; E$*I.i_m  
    HotKey[index]=0; Q8T4_p [-o  
    HotKeyMask[index]=0; \-`L}$  
    bRemoved=TRUE; S ^2'O7uj  
    KeyCount--; 2{#*z%|z  
    break; SO8Ej)m  
   } Po93&qE  
  } EtN"K-X  
 } o]PSyVg  
 return bRemoved; Nf1) 5  
} }evc]?1(  
In:h%4>  
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  DLL中的钩子函数如下: ]X@/0  
wf<uG|90  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) {I`B?6K5  
{ j@2-^q:`  
 BOOL bProcessed=FALSE; ukvz#hdE  
 if(HC_ACTION==nCode) rTW1'@E  
 { [ZDJs`h!`  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 bAt!9uFn  
   switch(wParam) u;1#eP\;  
   {  Xgr|~(^  
    case VK_MENU: R# mZYg  
     MaskBits&=~ALTBIT; 0Rrz   
     break; xLq+n jH E  
    case VK_CONTROL: {Yv |C)O  
     MaskBits&=~CTRLBIT; <P$b$fh/  
     break; "yL&?B"9@  
    case VK_SHIFT: (|h<{ -L  
     MaskBits&=~SHIFTBIT; CA[k$Sw*  
     break; !(l,+@j  
    default: //judge the key and send message ojtcKw  
     break; P@ 1D  
   }  ,Ad\!  
   for(int index=0;index<MAX_KEY;index++){ $aG]V-M>  
    if(hCallWnd[index]==NULL) Q]a5]:0  
     continue; 9S.R%2xw`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) kZSe#'R's  
    { .oAg (@^6  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ~F uD6f  
     bProcessed=TRUE; N~Ax78TX  
    } 8t0i j  
   } rS)7D  
  } [Z~>7ayF+)  
  else if((lParam&0xc000ffff)==1){ //有键按下 Z*jhSy  
   switch(wParam) S7~yRIjB  
   { ~8}"X] 4  
    case VK_MENU: m6+2r D  
     MaskBits|=ALTBIT; V4/eGh_T  
     break; ,Sghi&Ky  
    case VK_CONTROL: %Xkynso~  
     MaskBits|=CTRLBIT; |'Ve75 W6u  
     break; -V_e=Y<J/  
    case VK_SHIFT: >L[,.}(9  
     MaskBits|=SHIFTBIT; \#G`$JD  
     break; L$lo5  
    default: //judge the key and send message Scxf5x-  
     break; Y2<Z"D`  
   } LEHlfB#z`@  
   for(int index=0;index<MAX_KEY;index++){ tH17Z  
    if(hCallWnd[index]==NULL) }yS"C fM  
     continue; YPGn8A  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) BRD>q4w  
    { r$G;^  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); lt5~rH2  
     bProcessed=TRUE; ag[yM  
    } U>ob)-tl  
   } \muyL?  
  } >d#B149  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ;( VJZ_  
   for(int index=0;index<MAX_KEY;index++){ M /Bn^A8@  
    if(hCallWnd[index]==NULL) LOR$d^l  
     continue; ^Q2K0'm5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ?HZ+fS ,-  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ;)c SdA9  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ~A>3k2 N/e  
   } {lx^57v  
  } 4'G<qJoc  
 } Lr40rLx;u  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Gd:fWz(  
} ;y4 "wBX  
[G t|Qp[   
  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: eEezd[p  
k<8:  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 4Q_2GiF_ ?  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); A-c3B+  
X B65,l  
  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: }SUe 4r&4}  
jpOi Eo  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) pz.<5  
{ j31 Sc3vG  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) yd`.Rb&V  
 { k NK)mE  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 dwB-WF%k  
  SaveBmp(); ,B!u*  
  return FALSE; cnhYrX^  
 } 5 F H#)  
 …… //其它处理及默认处理 Q9FY.KUM  
} -L1{0{Z  
;Q? Qwda  
N ?0V0B  
  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。 )v0m7L v#/  
A%%WPBk{O  
  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。 rw8db'  
zF\k*B  
  二、编程步骤 wzP>Cq  
!oM 1  
  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"; }3M\&}=8  
V&)-u(s_S/  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; *hFT,1WE=+  
DQKhR sC  
  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; LD]XN'?"W  
J&{E  
  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;  Ur]5AJ  
9K FWa0G  
  5、 添加代码,编译运行程序。 olQ;XTa01F  
k\zNh<^  
三、程序代码 YuLW]Q?v  
Eh8.S)E  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL LxsB.jb-  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Ed_A#@V  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ #{i\t E  
#if _MSC_VER > 1000 Tw-gM-m;  
#pragma once PlTY^N6Hn  
#endif // _MSC_VER > 1000 OW1[Y-o[  
#ifndef __AFXWIN_H__ el-%#0  
#error include 'stdafx.h' before including this file for PCH XZIj' a0d  
#endif Gi Zy C  
#include "resource.h" // main symbols 70*Y4'u }A  
class CHookApp : public CWinApp GZ*cV3Y`&  
{ Q6"r^w Wx  
 public: F9-xp7 T  
  CHookApp(); 8Qek![3^  
  // Overrides RUSBJsMB  
  // ClassWizard generated virtual function overrides ^EM##Ss_  
  //{{AFX_VIRTUAL(CHookApp) k((_~<$2K  
 public: Z`q?pE>R  
  virtual BOOL InitInstance(); @/B&R^aVZ  
  virtual int ExitInstance(); b.;F)(  
  //}}AFX_VIRTUAL &YqgMC  
  //{{AFX_MSG(CHookApp) %3'80u6BCJ  
  // NOTE - the ClassWizard will add and remove member functions here. o!\Vk~Vi&  
  // DO NOT EDIT what you see in these blocks of generated code ! A GS?<6W-  
  //}}AFX_MSG n#bC ,  
  DECLARE_MESSAGE_MAP() a|lcOU  
}; N[ E t  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 80 i<Ij8J  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); dJ:EXVU  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 9M<qk si  
BOOL InitHotkey(); umSbxEZU@  
BOOL UnInit(); W@#)8];>  
#endif <_ddGg~  
@<AyCaU`.  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. *,@dt+H!y  
#include "stdafx.h" ] 6M- s  
#include "hook.h" F|%[s|s  
#include <windowsx.h> fZT=q^26  
#ifdef _DEBUG l*b3Mg  
#define new DEBUG_NEW w+*Jl}&\  
#undef THIS_FILE nOp\43no  
static char THIS_FILE[] = __FILE__; fh}\#WE"  
#endif WPpl9)Qc  
#define MAX_KEY 100 v#nYH?+~mJ  
#define CTRLBIT 0x04 EcBSi995dj  
#define ALTBIT 0x02 `NyvJt^<  
#define SHIFTBIT 0x01 _ z{:Q  
#pragma data_seg("shareddata") JEs?Rm1^.  
HHOOK hHook =NULL; b":cj:mxL  
UINT nHookCount =0; #R'm|En'  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey N1+%[Uh9)  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT G\|VTqu  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey gtVI>D'(W  
static int KeyCount =0; g' H!%<  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift vX/~34o]\  
#pragma data_seg() ?psvhB{O  
HINSTANCE hins; OUS@)Tyh  
void VerifyWindow(); zD7\Gv  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) g}P.ksM  
//{{AFX_MSG_MAP(CHookApp) ;r"YZs&Xd  
// NOTE - the ClassWizard will add and remove mapping macros here. Qc Ia%lf  
// DO NOT EDIT what you see in these blocks of generated code! K"#np!Y)  
//}}AFX_MSG_MAP V!a\:%#^Y  
END_MESSAGE_MAP() )TBBYCL3  
v; &-]ka  
CHookApp::CHookApp() ixE72bX  
{ '@ (WT~g  
 // TODO: add construction code here, ~t.*B& A  
 // Place all significant initialization in InitInstance E@Q+[~H}  
} ^MKvZ DOP  
x.xfMM2n  
CHookApp theApp; D CcM~  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ^e8~eL+  
{ ` SZ^~O  
 BOOL bProcessed=FALSE; j%#n}H  
 if(HC_ACTION==nCode) <p-R{}8  
 { E+]gC  
  if((lParam&0xc0000000)==0xc0000000){// Key up Iyz};7yVI  
   switch(wParam) iRBUX`0  
   { g75)&U`>}  
    case VK_MENU: T B1E1  
     MaskBits&=~ALTBIT; ?8)_,  
     break; m}'kxZTOm  
    case VK_CONTROL: CAX|[  
     MaskBits&=~CTRLBIT; Jp=ur)Dj  
     break; E,>/6AU  
    case VK_SHIFT: @s b\0}  
     MaskBits&=~SHIFTBIT; VSL6tQp  
     break; "U4Sn'&h@  
    default: //judge the key and send message 4b,N"w{v  
     break; cAC]%~orx  
   } Z)~.OqRw]  
   for(int index=0;index<MAX_KEY;index++){ &C`t(e  
    if(hCallWnd[index]==NULL) AQDT6E:  
     continue; R%"wf   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *"d"  
    { 4S`2")V  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Fi14_{  
     bProcessed=TRUE; [x kbzJ  
    } `lRZQ:27X  
   } F%UyFUz  
  } *[) b}?  
  else if((lParam&0xc000ffff)==1){ //Key down {AoH  
   switch(wParam) \/xWsbG\  
   { f-E]!\Pg  
    case VK_MENU: :-fCyF)EI  
     MaskBits|=ALTBIT; *&Np;^~  
     break; U^-:qT;CX  
    case VK_CONTROL: BlF>TI%2  
     MaskBits|=CTRLBIT; 3<88j&9  
     break; KnaQhZ  
    case VK_SHIFT: }*4XwUM e  
     MaskBits|=SHIFTBIT; /EZF5_`bT  
     break; MN}@EQvW==  
    default: //judge the key and send message BA4qQCS;5  
     break; }S\\"SBC  
   } }Dc0 Y  
   for(int index=0;index<MAX_KEY;index++) b%IRIi&,  
   { m-xSF]q=<  
    if(hCallWnd[index]==NULL) PO%Z.ol9  
     continue; LBh|4S$K  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) rwWs\~.H  
    { "t$c'`  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); SzR7:U  
     bProcessed=TRUE; |JC/A;ZH  
    } -NHA{?6r  
   } swss#?.se  
  } s5F,*<  
  if(!bProcessed){ jQxv` H  
   for(int index=0;index<MAX_KEY;index++){ sgW*0o  
    if(hCallWnd[index]==NULL) {dM18;  
     continue; dMK| l   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) rvgArFf}]  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ] ?w hx &+  
   } 9tDo5 29  
  } ]vo&NE  
 } OSY$qL2  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); +&6R(7XC  
} />=)=CGv;  
LmE%`qNg  
BOOL InitHotkey() 2Dgulx5kGZ  
{ ]:uJ&xUar  
 if(hHook!=NULL){ `md)|PSU  
  nHookCount++; r-&Rjg  
  return TRUE; u(iEuF;7  
 } +F= j1*'&  
 else F)Oe;z6  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Z7a~M3VnZ  
  if(hHook!=NULL) KAVe~j"  
   nHookCount++; 5v >0$Y{  
  return (hHook!=NULL); q,w8ca 4~y  
} $ lz\t e  
BOOL UnInit() *8{PoD   
{ ByqB4Hv2  
 if(nHookCount>1){ 'id] <<F  
  nHookCount--; p uEu v6F  
  return TRUE; iOXxxP%#  
 } ^Tgu]t   
 BOOL unhooked = UnhookWindowsHookEx(hHook); K:hZ  
 if(unhooked==TRUE){ JR>#PJ,N-  
  nHookCount=0; v[~e=^IIsl  
  hHook=NULL; {>$i)B  
 } cBs:7Pnp%  
 return unhooked; COvcR.*0F  
} }q7rR:g  
;;#28nV  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) //T1e7)  
{ fn(< <FA)  
 BOOL bAdded=FALSE; @Cg%7AF  
 for(int index=0;index<MAX_KEY;index++){ Z7>pz:,  
  if(hCallWnd[index]==0){ A Ws y9  
   hCallWnd[index]=hWnd; >1u!(-A  
   HotKey[index]=cKey; tl5}#uJ  
   HotKeyMask[index]=cMask; *Y'nDv6_P  
   bAdded=TRUE; W?is8r:  
   KeyCount++; o,}`4_N||  
   break; ,v(K |P@  
  } Awy-kou[C  
 } qYjR  
 return bAdded; GF]V$5.ps  
} G>"=Af(t?Y  
?XOl>IO  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)  &ig6\&1  
{ 9+><:(,  
 BOOL bRemoved=FALSE; r:.3P  
 for(int index=0;index<MAX_KEY;index++){ 2wCTd:e:  
  if(hCallWnd[index]==hWnd){ kYMKVR  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ H5wzzSV!:B  
    hCallWnd[index]=NULL; 9HJrMX  
    HotKey[index]=0; MtWzGE=?  
    HotKeyMask[index]=0; R <Mvwu  
    bRemoved=TRUE; bn$a7\X-  
    KeyCount--; _ zM/>Qa  
    break; nM]Sb|1:  
   } -!w({rP  
  } qI (<5Wxl  
 } :K J#_y\rt  
 return bRemoved; )> >Tj7  
} =@BVO @z@  
W>[0u3  
void VerifyWindow() ;J<K/YdI  
{ 4I&e_b< 30  
 for(int i=0;i<MAX_KEY;i++){ mIk8hA@B_  
  if(hCallWnd!=NULL){ a@+n  
   if(!IsWindow(hCallWnd)){ W`auQO  
    hCallWnd=NULL; cPu<:<F[  
    HotKey=0; 0i%r+_E_  
    HotKeyMask=0; ).IB{+  
    KeyCount--; NmbA~i  
   } vxN,oa{hf  
  } p@`]9tLP(K  
 } Zw4z`x1f  
} /O@TqH  
R1A|g =kF  
BOOL CHookApp::InitInstance() z''ITX)oG  
{ $"#2hVO  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); <<#j?%  
 hins=AfxGetInstanceHandle(); ~%.<rc0  
 InitHotkey(); oXW51ty  
 return CWinApp::InitInstance(); J9buf}C[  
} xb6y=L  
xhq-$"B  
int CHookApp::ExitInstance() c_p7vvI&c0  
{ 60RYw9d%0  
 VerifyWindow(); Ep }{m<8c  
 UnInit(); ^)wTCkH&y  
 return CWinApp::ExitInstance(); ON r}{T%@/  
} Xo,}S\wcn  
#H8% BZyV  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file >s*ZT%TF  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ! J7ExfEA  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 5}v<?<l9\  
#if _MSC_VER > 1000 TDqH"q0  
#pragma once )7`2FLG  
#endif // _MSC_VER > 1000 3fdx&}v/  
-(ev68'}W  
class CCaptureDlg : public CDialog CN(}0/  
{ [9c|!w^F  
 // Construction c}$C=s5 h}  
 public: l:'\3-2a  
  BOOL bTray; a%FM)/oI|T  
  BOOL bRegistered; Wjf,AjL\  
  BOOL RegisterHotkey(); J/T$.*X  
  UCHAR cKey; |:[ [w&R  
  UCHAR cMask; IXA3G7$)  
  void DeleteIcon(); V$OZC;4  
  void AddIcon(); cUB+fH<B2  
  UINT nCount; >^odV ;^  
  void SaveBmp(); =uG}pgh0  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 3_5]0:?]-  
  // Dialog Data 2*[Gm e  
  //{{AFX_DATA(CCaptureDlg) TAE@KSPvo  
  enum { IDD = IDD_CAPTURE_DIALOG }; }I )%Gw  
  CComboBox m_Key; |O!G[|/3  
  BOOL m_bControl; [p:mja.6y  
  BOOL m_bAlt; q2SlK8`QJ  
  BOOL m_bShift; 7k<6oM1  
  CString m_Path; BSyl!>G6n8  
  CString m_Number; 45 \W%8  
  //}}AFX_DATA igGg[I1?  
  // ClassWizard generated virtual function overrides 1Uy'TEk  
  //{{AFX_VIRTUAL(CCaptureDlg) W08rGY  
 public: RkMs!M   
  virtual BOOL PreTranslateMessage(MSG* pMsg); 9^4BqAWYrV  
 protected: $F#eD 0|  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support #uc9eh}CWO  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); j92X"yB  
  //}}AFX_VIRTUAL |mS-<e8LY4  
  // Implementation gt>k]0  
 protected: WR<,[*Mv^  
  HICON m_hIcon; OZ SM2~  
  // Generated message map functions Cu\6VnW_6  
  //{{AFX_MSG(CCaptureDlg) (gQr?K  
  virtual BOOL OnInitDialog(); 9-`P\/  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); e'y$X;nIv  
  afx_msg void OnPaint(); :4\=xGiY  
  afx_msg HCURSOR OnQueryDragIcon(); exP:lO_0n  
  virtual void OnCancel(); 4S 7#B  
  afx_msg void OnAbout(); S A\_U::T  
  afx_msg void OnBrowse(); azCod1aL{  
  afx_msg void OnChange(); m|by^40A(  
 //}}AFX_MSG C{<dzooz  
 DECLARE_MESSAGE_MAP() +9fQ YJBA  
}; f_m~_`m  
#endif Uv|?@zy#  
EvJ<X,Bo  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 0e,U&B<W  
#include "stdafx.h" t(.jJ>|+*  
#include "Capture.h" <aR sogu"P  
#include "CaptureDlg.h" x o{y9VS  
#include <windowsx.h> V/dL-;W;  
#pragma comment(lib,"hook.lib") 7.W$6U5  
#ifdef _DEBUG ahmxbv3f=5  
#define new DEBUG_NEW t`!@E#VK  
#undef THIS_FILE oQ{ X2\  
static char THIS_FILE[] = __FILE__; q L-Ni  
#endif tmgZNg  
#define IDM_SHELL WM_USER+1 &`LR{7m  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ;JHR~ TV  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); zu! #   
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; oa"_5kn,  
class CAboutDlg : public CDialog \&,{N_G#L.  
{ 12 TX_0  
 public: v"v-c!k  
  CAboutDlg(); ']__V[  
  // Dialog Data AcQmY?  
  //{{AFX_DATA(CAboutDlg) a)qlrtCl  
  enum { IDD = IDD_ABOUTBOX }; 9\S,$A{{*  
  //}}AFX_DATA ,T;T %/ S  
  // ClassWizard generated virtual function overrides ][ V@t^  
  //{{AFX_VIRTUAL(CAboutDlg) $MYAYj9r)  
 protected: 'mm~+hp  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support &0k`=?v$  
  //}}AFX_VIRTUAL ?#obNQ"u]  
  // Implementation JF6=0  
 protected: g><i tA?  
  //{{AFX_MSG(CAboutDlg) ph~ d%/^jI  
  //}}AFX_MSG m> YjV>5  
  DECLARE_MESSAGE_MAP() ?Hrj}K27  
}; m+=L}[  
=>Q$S  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) h{/lW#[  
{ ur| vh5  
 //{{AFX_DATA_INIT(CAboutDlg) 2SRmh!hr  
 //}}AFX_DATA_INIT :\cid]y3  
} qbq.r&F&  
>E\U$}WCG  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) "59"HVV  
{ ]x1o (~  
 CDialog::DoDataExchange(pDX); #8CeTR23cw  
 //{{AFX_DATA_MAP(CAboutDlg) hEk0MY  
 //}}AFX_DATA_MAP pp1kcrE\M  
} \}EJtux q  
SpA-E/el  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) *OU&`\bmE  
 //{{AFX_MSG_MAP(CAboutDlg) fI"OzIJV  
 // No message handlers 3:?QE  
 //}}AFX_MSG_MAP z`2Ais@ao  
END_MESSAGE_MAP() rGgP9 (  
HvJ-P#  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) B{2WvPX~q  
: CDialog(CCaptureDlg::IDD, pParent) eEZZ0NNe;  
{ {D`_q|  
 //{{AFX_DATA_INIT(CCaptureDlg) E! mxa  
  m_bControl = FALSE; |,lw$k93  
  m_bAlt = FALSE; n^2'O:V s  
  m_bShift = FALSE; FC q&-  
  m_Path = _T("c:\\"); YtFH@M  
  m_Number = _T("0 picture captured."); -Zfq:Kr  
  nCount=0; iM +p{ /bN  
  bRegistered=FALSE; /=gU  
  bTray=FALSE; "YoFUfaNg  
 //}}AFX_DATA_INIT j%ux,0Y  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 >7(7  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); DP08$Iq  
} -/LB-t  
q!whWA  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) P:k!dRb9{  
{ j*L-sU  
 CDialog::DoDataExchange(pDX); ueu=$.^;g  
 //{{AFX_DATA_MAP(CCaptureDlg) ~^v*f   
  DDX_Control(pDX, IDC_KEY, m_Key); / 0y5/  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); a'|/=$  
  DDX_Check(pDX, IDC_ALT, m_bAlt); n|Gw?@CU7  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); &]jCoBj+_  
  DDX_Text(pDX, IDC_PATH, m_Path); w|( ix;pK  
  DDX_Text(pDX, IDC_NUMBER, m_Number); .,&6 x.  
 //}}AFX_DATA_MAP IiZXIG4H  
} *zl-R*bM$  
>fx/TSql:J  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ]>oI3&6s  
//{{AFX_MSG_MAP(CCaptureDlg) U!i@XA%P  
 ON_WM_SYSCOMMAND() @jT=SFf  
 ON_WM_PAINT() >gZ"^iW  
 ON_WM_QUERYDRAGICON() %R@&8  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 2U rE>_  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) a{+;&j[!  
 ON_BN_CLICKED(ID_CHANGE, OnChange) sZ%wQqy~k  
//}}AFX_MSG_MAP #/o1D^  
END_MESSAGE_MAP() Dy^A??A[E}  
=0_((eXwf  
BOOL CCaptureDlg::OnInitDialog() 7f\/cS^  
{ '$y.`/$  
 CDialog::OnInitDialog(); KYC<*1k  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); dEK bB  
 ASSERT(IDM_ABOUTBOX < 0xF000); gjc[\"0a5h  
 CMenu* pSysMenu = GetSystemMenu(FALSE); =fcRH:B:  
 if (pSysMenu != NULL) 1pZ[r M'}  
 { qd@Fb*  
  CString strAboutMenu; 17S<6j#H5  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ?X3uPj9if  
  if (!strAboutMenu.IsEmpty()) (F'?c1  
  { 6;p"xC-  
   pSysMenu->AppendMenu(MF_SEPARATOR); *#c^.4$'  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); M(#]NTr ~4  
  } YnW,6U['{g  
 } 3im2 `n  
 SetIcon(m_hIcon, TRUE); // Set big icon )mE67{YJh~  
 SetIcon(m_hIcon, FALSE); // Set small icon mL]5Tnc  
 m_Key.SetCurSel(0); eGi|S'L'  
 RegisterHotkey(); by* v($  
 CMenu* pMenu=GetSystemMenu(FALSE); G ;  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); v\Edf;(  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); P;[>TCs ]8  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); AN4(]_ ]  
 return TRUE; // return TRUE unless you set the focus to a control LT6VZ,S  
} %)PQomn?  
1SY3  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) DPylc9[-  
{ +Q&CIo  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) _v +At;Y  
 { V<0J j  
  CAboutDlg dlgAbout; eZ;DNZK av  
  dlgAbout.DoModal(); g<5G#  
 } =8 01nZJ  
 else R\:t 73  
 { c*Q6k<SKR  
  CDialog::OnSysCommand(nID, lParam); apd"p{  
 } =(W l'iG   
} _{48s8V  
m"tke'a  
void CCaptureDlg::OnPaint() L0>w|LpRc  
{ nWsR;~pK  
 if (IsIconic()) Vho^a:Z9}W  
 { ^9 {r2d&c  
  CPaintDC dc(this); // device context for painting ZY-mUg  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); V(<(k,8=  
  // Center icon in client rectangle .tt=\R  
  int cxIcon = GetSystemMetrics(SM_CXICON); p5 )+R/  
  int cyIcon = GetSystemMetrics(SM_CYICON); T(iL#2^  
  CRect rect; G L8 N!,  
  GetClientRect(&rect); mBWhC<kKs  
  int x = (rect.Width() - cxIcon + 1) / 2; *D;VZs0O  
  int y = (rect.Height() - cyIcon + 1) / 2; Ng+Ge5C9  
  // Draw the icon H <ugc  
  dc.DrawIcon(x, y, m_hIcon); } f+hB  
 } *tL1t\jY  
 else %LBT:Aw  
 { l527>7 eT  
  CDialog::OnPaint(); 0/0rWqg /  
 } 4Vrx9 sA1  
} kH>^3( Q\  
+d/^0^(D\5  
HCURSOR CCaptureDlg::OnQueryDragIcon() iBPx97a  
{ Y~uqKb;A  
 return (HCURSOR) m_hIcon; "i/3m'<2  
} J&jig?t  
iMXK_O%  
void CCaptureDlg::OnCancel() W.VyH|?  
{ /S\y-M9  
 if(bTray) NZ?|#5 3  
  DeleteIcon(); B(U0 ~{7a  
  CDialog::OnCancel(); +Y|HO[  
} nO7#m~  
et0yS%7+?@  
void CCaptureDlg::OnAbout() N~@VZbS(6  
{ 3+| {O  
 CAboutDlg dlg; ?L~Z]+-  
 dlg.DoModal(); B^sHFc""V  
} d( +E0  
&+>)H$5  
void CCaptureDlg::OnBrowse() ?{M!syD<  
{ hg=BXe4:  
 CString str; {ei,>5K  
 BROWSEINFO bi; kN,WB  
 char name[MAX_PATH]; _Q3Ad>,U  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); WmT(>JBO  
 bi.hwndOwner=GetSafeHwnd(); Z,bvD'u  
 bi.pszDisplayName=name; :i_k A'dl&  
 bi.lpszTitle="Select folder"; /o=,\kM  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; p$A`qx<M_  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ; (;J  
 if(idl==NULL) W9ewj:4\0  
  return; >J[Wd<~t  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); (" +/ :  
 str.ReleaseBuffer(); 8FY/57.W  
 m_Path=str; wc5OK0|  
 if(str.GetAt(str.GetLength()-1)!='\\') >f*[U/{ K  
  m_Path+="\\"; LYY|8)Nj2"  
 UpdateData(FALSE); Kzd`|+?'`M  
} h7H#sL[^  
'of5v6:8  
void CCaptureDlg::SaveBmp() v|v^(P,o  
{ JV#)?/a$z  
 CDC dc; H21\6 GY  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); [ZP8l'?  
 CBitmap bm; zu Jl #3YP  
 int Width=GetSystemMetrics(SM_CXSCREEN);  _,2P4  
 int Height=GetSystemMetrics(SM_CYSCREEN); \4.U.pKY  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Eb<iR)e H=  
 CDC tdc; F+@E6I'g  
 tdc.CreateCompatibleDC(&dc); hp E?  
 CBitmap*pOld=tdc.SelectObject(&bm); ]d@@E_s]  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); $LF  
 tdc.SelectObject(pOld); zaVDe9B,7  
 BITMAP btm; >Rbgg1^]5  
 bm.GetBitmap(&btm); U&mJ_f#M  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; %q@eCN  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 2\z"6  
 BITMAPINFOHEADER bih; eiF!yk?2  
 bih.biBitCount=btm.bmBitsPixel; .bYDj&]P{  
 bih.biClrImportant=0; Gd~Xvw,u  
 bih.biClrUsed=0; U$`)|/8  
 bih.biCompression=0; >_biiW~x:  
 bih.biHeight=btm.bmHeight; ZL`G<Mo;.  
 bih.biPlanes=1; #(53YoV_8  
 bih.biSize=sizeof(BITMAPINFOHEADER); w\'Zcw,d  
 bih.biSizeImage=size; qYW{$K  
 bih.biWidth=btm.bmWidth; Lj$yGdK<  
 bih.biXPelsPerMeter=0; b-{\manH  
 bih.biYPelsPerMeter=0; PomX@N}1  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 6?0 ^U 9  
 static int filecount=0; K'%,dn  
 CString name; ~7!J/LHg  
 name.Format("pict%04d.bmp",filecount++); %3i/PIN  
 name=m_Path+name; .6[xX?i^T  
 BITMAPFILEHEADER bfh; =>hq0F4[;  
 bfh.bfReserved1=bfh.bfReserved2=0; WG;1[o&  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ?'K}bmdt}.  
 bfh.bfSize=54+size; 0C}7=_?  
 bfh.bfOffBits=54; MO :##C  
 CFile bf; x,js}Mlw  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 2k[i7Rl \c  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); aho;HM$hjP  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); EvMhNq~y5  
  bf.WriteHuge(lpData,size); X9nt;A2TU+  
  bf.Close(); Fz16m7.  
  nCount++; i_4FxC4  
 } -pj&|< h+9  
 GlobalFreePtr(lpData); jz|zq\Eek  
 if(nCount==1) }VE[W  
  m_Number.Format("%d picture captured.",nCount); "JSg/optc  
 else 7g5sJj  
  m_Number.Format("%d pictures captured.",nCount); +V&b<y;?>  
  UpdateData(FALSE); HB\y [:E  
} !cLX1S  
:>'^l?b'WX  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) w&v_#\T  
{ 3skq%;%Wsk  
 if(pMsg -> message == WM_KEYDOWN) vI ]| W  
 { V5K!u8T  
  if(pMsg -> wParam == VK_ESCAPE)  :XF;v  
   return TRUE; Wn24eld"x  
  if(pMsg -> wParam == VK_RETURN) (]>c8;o#b  
   return TRUE; K 3?7Hndf2  
 } r,i^-jv;  
 return CDialog::PreTranslateMessage(pMsg); d>  Y9g  
} !$St=!  
p[&'*"o!/  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) UioLu90 P  
{ A7-QOqST(  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Qm,|'y:Tg  
  SaveBmp(); hkv&Od,  
  return FALSE; suaTXKjyk+  
} Yv9(8  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ "sf8~P9qy  
 CMenu pop; (ui"vLk8PP  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); >t?;*K\x"  
 CMenu*pMenu=pop.GetSubMenu(0); tp_*U,  
 pMenu->SetDefaultItem(ID_EXITICON); uFb&WIo1  
 CPoint pt; +=Crfvt  
 GetCursorPos(&pt); ,;H)CUe1"  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); qbHb24I  
 if(id==ID_EXITICON) ve=oH;zf  
  DeleteIcon(); Gs.id^Sf  
 else if(id==ID_EXIT) FbJlyWND  
  OnCancel(); 6I72;e ^!  
 return FALSE; 4'?kyTO~  
} Fc7mAV=  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); @xB"9s  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) A"#Gg7]tl'  
 AddIcon(); z`xdRe{QP  
 return res; @1gX>!  
} }!(cm;XA"  
CP'?Om2  
void CCaptureDlg::AddIcon() QOEcp% 6I}  
{ F%lP<4Vx  
 NOTIFYICONDATA data; 3F[z]B  
 data.cbSize=sizeof(NOTIFYICONDATA); Cz+>S3v M  
 CString tip; C* b!E:  
 tip.LoadString(IDS_ICONTIP); zy8W8h(?  
 data.hIcon=GetIcon(0); +I5@Gys  
 data.hWnd=GetSafeHwnd(); eL#pS=  
 strcpy(data.szTip,tip); R.!'&<Svq  
 data.uCallbackMessage=IDM_SHELL; -j`tBv)  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 5"c#O U  
 data.uID=98; :U0z;  
 Shell_NotifyIcon(NIM_ADD,&data); eFp4MD8?  
 ShowWindow(SW_HIDE); %w=*4!NWb  
 bTray=TRUE; O]~cv^  
} VW I{ wC  
h:<p EL  
void CCaptureDlg::DeleteIcon() !BP/#  
{ "D2 `=D!+  
 NOTIFYICONDATA data; ,*Tf9=z  
 data.cbSize=sizeof(NOTIFYICONDATA); .4Jea#M&x  
 data.hWnd=GetSafeHwnd(); `Ou\:Iz0u  
 data.uID=98; M8ZpNa  
 Shell_NotifyIcon(NIM_DELETE,&data); 1xar L))  
 ShowWindow(SW_SHOW); ux& WN ,  
 SetForegroundWindow(); - {>JF  
 ShowWindow(SW_SHOWNORMAL); T'  %TMA  
 bTray=FALSE; PP.QfY4  
} "Up3W%]SB  
xJa  
void CCaptureDlg::OnChange() 6FiI\  
{ #pErGz'{  
 RegisterHotkey(); 0+}42g|_Z  
} 1\=)b< y  
$5jQm,V$K  
BOOL CCaptureDlg::RegisterHotkey() ?]]> WP  
{ 3~ ;LNi  
 UpdateData(); mFw`LvH?*  
 UCHAR mask=0; *8M 0h9S$  
 UCHAR key=0; ARGtWW~:  
 if(m_bControl) n#Q;b Sw  
  mask|=4; &q^\*<B.^  
 if(m_bAlt) c3W9"  
  mask|=2; 1N{}G$'Go  
 if(m_bShift) ~,WG284  
  mask|=1; oDogM`T`  
  key=Key_Table[m_Key.GetCurSel()]; RSC^R}a5  
 if(bRegistered){ y[:\kI  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 9fj3q>Un,  
  bRegistered=FALSE; 1@rI4U@D  
 } v;AsV`g  
 cMask=mask; l\xcR]O  
 cKey=key; 5ltEnvN  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); dQT A^m  
 return bRegistered; {}kE=L5  
} tPBr{  
_y*@Hj  
  四、小结 Mrysy)x  
%N$,1=0*  
  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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