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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: tSUEZ62EY  
  7Q9 w?y~c  
  一、实现方法 H$t_Xw==  
An0|[uWH  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: V)k4:H  
 7xlkZF  
#pragma data_seg("shareddata") L`TLgH&?R  
HHOOK hHook =NULL; //钩子句柄 l|[N42+  
UINT nHookCount =0; //挂接的程序数目 I$G['` XX/  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 pah'>dAL  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 eM6<%?b  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey V=l0(03j~  
static int KeyCount =0; EME|k{W  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 n( yn<  
#pragma data_seg() g:@#@1rB6  
c)85=T6*aA  
  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。 PFjL1=7I  
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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: $a]`nLUa  
;$|nrwhy  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR PC8Q"O  
cKey,UCHAR cMask) 9TC,!0U{_.  
{ q<|AZ2Ai  
 BOOL bAdded=FALSE; =UQ3HQD  
 for(int index=0;index<MAX_KEY;index++){ 0s[Hkhls  
  if(hCallWnd[index]==0){ .L~AL|2_  
   hCallWnd[index]=hWnd; Zu[su>\  
   HotKey[index]=cKey; C,r;VyW6BI  
   HotKeyMask[index]=cMask; Lk8ek}o'  
   bAdded=TRUE; f$$/H>MJ  
   KeyCount++; W ac&b  
   break; va@Lz&sAE%  
  } wi=v}R_  
 } x 9fip-  
 return bAdded; ZY+qA  
} bY:x8fl  
//删除热键 d$!RZHo10V  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) u6JM]kR  
{ ^09,"<@k  
 BOOL bRemoved=FALSE; $U~]=.n  
 for(int index=0;index<MAX_KEY;index++){ PJH&  
  if(hCallWnd[index]==hWnd){ 8l`*]1.W<  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ #"~<HG}bR/  
    hCallWnd[index]=NULL; F JyT+  
    HotKey[index]=0; sO@Tf\d  
    HotKeyMask[index]=0; H.MI5O(Q  
    bRemoved=TRUE; e\L8oOk#r  
    KeyCount--; kxv1Hn"`{E  
    break; F)eelPZ+,  
   } XSLFPTDEc  
  } 3!]rmZ-W  
 } L!xi  
 return bRemoved; @ j/a=4o[  
} #ABZ&Z  
dy[X3jQB  
(4nq>;$3  
  DLL中的钩子函数如下: SmO~,2=  
=I_'.b  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ]Y&VT7+Z  
{ X &H"51  
 BOOL bProcessed=FALSE; kAUymds;O  
 if(HC_ACTION==nCode) (E1~H0^  
 { >A"(KSNL  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 |[8Th4*n  
   switch(wParam) JxU5 fe  
   {  )^hbsMhO  
    case VK_MENU: (TM,V!G+U~  
     MaskBits&=~ALTBIT; s eJ^s@H5l  
     break; ]ZS OM\}  
    case VK_CONTROL: OY({.uVdX  
     MaskBits&=~CTRLBIT; Aos+dP5h,8  
     break; +=)+'q]S  
    case VK_SHIFT: _yR^*}xJb  
     MaskBits&=~SHIFTBIT; >9J:Uo1z  
     break; Z;"vW!%d  
    default: //judge the key and send message )+Pus~w  
     break; tZo} ;|~'  
   } <1!O1ab  
   for(int index=0;index<MAX_KEY;index++){  %;!.n{X  
    if(hCallWnd[index]==NULL) _)-o1`*-  
     continue; ^LLzZnkcZ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) aw>#P   
    { -UT}/:a  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); lu/ (4ED  
     bProcessed=TRUE; Wc 'H  
    } 93hxSRw  
   } RD&PDXT4  
  } i@J ;G`  
  else if((lParam&0xc000ffff)==1){ //有键按下 `r_/Wt{g  
   switch(wParam) kG*~ |ma  
   { BDVtSs<7  
    case VK_MENU: =g|FT  
     MaskBits|=ALTBIT; @KAI4LP  
     break; /a o5FL  
    case VK_CONTROL: E_LN]v  
     MaskBits|=CTRLBIT; T[j,UkgGo  
     break; k VQ\1!  
    case VK_SHIFT: F6dP,(  
     MaskBits|=SHIFTBIT; ?z u8)U  
     break; Y6d@h? ht  
    default: //judge the key and send message ,Y48[_ymm  
     break; cN9t{.m  
   } 4X|zmr:A  
   for(int index=0;index<MAX_KEY;index++){ WuW^GC{7  
    if(hCallWnd[index]==NULL) xkR0  
     continue; Q NVa?'0"Y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) h)nG)|c  
    { Rws3V"{`[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); N}YkMJy  
     bProcessed=TRUE; `y* }lg T  
    } }o{(S%%  
   } & ZB  
  } ^sg,\zD 'X  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Ecx<OTo  
   for(int index=0;index<MAX_KEY;index++){ >@AB<$ A  
    if(hCallWnd[index]==NULL) ]M'=^32  
     continue; N)>ID(}F1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) GowH]MO  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); CVR3 A'  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 n?K  
   } da~],MN  
  } KCDE{za  
 } &]-DqK7  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); FU<Jp3<%  
} /|&*QLy  
e(8Ba X _  
  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: G9@0@2aY8  
pFz`}?c0  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ]"1DGg \A  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); RY*U"G0#w  
F1Bq$*'N$w  
  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: w:l V"]1  
~.lPEA %%  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ##4HYQ%E  
{ P}`H ~N~  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) eGbG w  
 { $]2vvr  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 9]o-O]7/  
  SaveBmp(); , SnSW-P  
  return FALSE; *s iFj CN<  
 } ;mKb]  
 …… //其它处理及默认处理 26x[X.C:  
} t.\dpBq  
',5 ky{  
s=/v';5J2!  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 6/dI6C!  
IRqy%@)  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 Hl |z</*+  
N_q|\S>t/  
  二、编程步骤 Tc3yS(aq  
I ?.^ho  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; \:F_xq  
0%I=d  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; g5r(>,vY  
`&6dnSC},P  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; /fV;^=:8c  
"|KP'<8%  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; r1RM  
cD'V>[h  
  5、 添加代码,编译运行程序。 (7=9++uU  
O463I.XAP  
三、程序代码 \v)+.m?n  
wZZt  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 3I-MdApT  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) UN<]N76!  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ B~Xw[q  
#if _MSC_VER > 1000 %FIE\9  
#pragma once 'Ne@e)s9  
#endif // _MSC_VER > 1000 ,7K`[  
#ifndef __AFXWIN_H__ ;q6Ki.D  
#error include 'stdafx.h' before including this file for PCH &H:(z4/  
#endif `$ aZ0+  
#include "resource.h" // main symbols $(>+VH`l  
class CHookApp : public CWinApp oIj#>1~c%  
{ 3 xp)a%=7  
 public: -Wi` G  
  CHookApp(); _[ZO p ~  
  // Overrides :${HQd+  
  // ClassWizard generated virtual function overrides Pce;r*9  
  //{{AFX_VIRTUAL(CHookApp) $43qME  
 public: (+y  
  virtual BOOL InitInstance(); Dy8r 9  
  virtual int ExitInstance(); {8,J@9NU  
  //}}AFX_VIRTUAL ?o#%Xs  
  //{{AFX_MSG(CHookApp) dQR-H7U  
  // NOTE - the ClassWizard will add and remove member functions here. ut/=R !(K  
  // DO NOT EDIT what you see in these blocks of generated code ! L.0mk_&  
  //}}AFX_MSG *>qp:;,DKP  
  DECLARE_MESSAGE_MAP() 9ahWIO %  
}; *w0%d1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ^iw'^6~  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `t'W2X  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); +l{=  
BOOL InitHotkey(); u-G+ j)  
BOOL UnInit(); d-r@E3  
#endif -"60d @.  
CDR@ `1-  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. g:Xhw$x9  
#include "stdafx.h" +<3X J7D  
#include "hook.h" b-Q>({=i  
#include <windowsx.h> !6>~?gNd  
#ifdef _DEBUG @>>~CZ`l  
#define new DEBUG_NEW M>ruKHipFE  
#undef THIS_FILE :;fHDU|  
static char THIS_FILE[] = __FILE__; 3r."j2$Hs0  
#endif 9b"=9y,  
#define MAX_KEY 100 _k ~KZ;l  
#define CTRLBIT 0x04 OCaq3_#tZ  
#define ALTBIT 0x02 |My4SoOF  
#define SHIFTBIT 0x01  >DZw  
#pragma data_seg("shareddata") .-oxb,/  
HHOOK hHook =NULL; nWYN Np?h  
UINT nHookCount =0; e:n<EnT  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 3L}!RB  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT kN4{13Qs*  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey .ndCfdy~  
static int KeyCount =0; 9V@V6TvW>&  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 8hJ%JEzga  
#pragma data_seg() MUREiL9L|  
HINSTANCE hins; }Nm#q@o$P  
void VerifyWindow(); %r}{hq4  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) T)TfB(  
//{{AFX_MSG_MAP(CHookApp) ?+W 9az]+  
// NOTE - the ClassWizard will add and remove mapping macros here. yt=3sq  
// DO NOT EDIT what you see in these blocks of generated code! LzXmb 7A  
//}}AFX_MSG_MAP Be=u&T:~  
END_MESSAGE_MAP() v>Yb/{A  
'o+L41  
CHookApp::CHookApp() n; +LH9  
{ =JbRu|/  
 // TODO: add construction code here, EwC{R`  
 // Place all significant initialization in InitInstance v)l8@.  
} .C( eh   
1&)?JZhg  
CHookApp theApp; %gyLCTw  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) y 4I6  
{ [nc4{0aT'  
 BOOL bProcessed=FALSE; f'-i o<.  
 if(HC_ACTION==nCode) %]DP#~7[|  
 { UA8GL D9  
  if((lParam&0xc0000000)==0xc0000000){// Key up )ufg9"\  
   switch(wParam) uK$9Ll{lk  
   { r(aLEJ"u?  
    case VK_MENU: ceM6{N<_U  
     MaskBits&=~ALTBIT; */|lJm'R  
     break; =K{"{5Wb  
    case VK_CONTROL: eg?<mKrZ  
     MaskBits&=~CTRLBIT; q<[_T  
     break; l@H  
    case VK_SHIFT: Y/ >&0wj)d  
     MaskBits&=~SHIFTBIT; [}/LD3  
     break; Co9QW/'i  
    default: //judge the key and send message $8xl#SqH  
     break; lB4GU y$  
   } T:Hr&ws4  
   for(int index=0;index<MAX_KEY;index++){ Ib\iT:AJ  
    if(hCallWnd[index]==NULL) rI>aAW'  
     continue; ng:9 l3 x  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *x])Y~oQ  
    { #H{<gjs]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); {u\Mj  
     bProcessed=TRUE; Q/I! }C4  
    } Fpa ;^F  
   } }L3oR  
  } sqJSSNt  
  else if((lParam&0xc000ffff)==1){ //Key down `V"sOTb  
   switch(wParam) n9A7K$ZD@  
   { X4t s)>"d  
    case VK_MENU: RIE5KCrGB  
     MaskBits|=ALTBIT; Zh*u(rO  
     break; Ucm :S-  
    case VK_CONTROL: 9h%?QC  
     MaskBits|=CTRLBIT; Jn3 An  
     break; xY U.D+RY  
    case VK_SHIFT: dd%h67J2<  
     MaskBits|=SHIFTBIT; k^%B5  
     break; %]6~Eq%s  
    default: //judge the key and send message ,^WJm?R  
     break; IWveW8qJ  
   } [],1lRYI9_  
   for(int index=0;index<MAX_KEY;index++) \eb|eN0i  
   { *gF<m9&  
    if(hCallWnd[index]==NULL) 0i|oYaC  
     continue; Nl9I*x^e  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) YJ/zU52JK~  
    { bi&*9K0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); HJ[/|NZU$  
     bProcessed=TRUE; ?wF'<kEH  
    } ]f: v,a  
   } Vc%R$E%  
  } f{i8w!O"~  
  if(!bProcessed){ MXiQ1 x  
   for(int index=0;index<MAX_KEY;index++){ ZA9sTc[ g  
    if(hCallWnd[index]==NULL) jhX[fT1m  
     continue; saAxGG  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) *"98L+  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);  "t$k  
   } >Clh] ;K  
  } 7,MS '2nz  
 } ,7)C"  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ^o@,3__7Q  
} CWG6;NT6m  
X_G| hx  
BOOL InitHotkey() m6yIR6H  
{ 9lj!C '  
 if(hHook!=NULL){ G633Lm`ri  
  nHookCount++; F@!Td(r2  
  return TRUE; !k(_PM  
 } l Js <  
 else KkMay  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); gx:;&4AD  
  if(hHook!=NULL) qcJft'>F  
   nHookCount++; KZ e)K_1[  
  return (hHook!=NULL); XJ+6FT/qss  
} R%H$%cnj  
BOOL UnInit() q7m6&2$[  
{ SL&hJs4c'  
 if(nHookCount>1){ yag}fQ(XH  
  nHookCount--; >x@P|\  
  return TRUE; Y'3}G<'%  
 } tPyyZ#,  
 BOOL unhooked = UnhookWindowsHookEx(hHook); }Y1>(U  
 if(unhooked==TRUE){ RF!1oZ  
  nHookCount=0; Na,_  
  hHook=NULL; *Sf -; U  
 } o:dR5v  
 return unhooked; MZSxQ8  
} a>B[5I5  
q 'a  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) /Go K}W}  
{ j#6|V]l  
 BOOL bAdded=FALSE; kF V7l  
 for(int index=0;index<MAX_KEY;index++){ kK~IwA  
  if(hCallWnd[index]==0){ ,Ci/xnI  
   hCallWnd[index]=hWnd; cM&'[CI  
   HotKey[index]=cKey; w[Ep*-yeI  
   HotKeyMask[index]=cMask; nxap\Lf  
   bAdded=TRUE; ? {F{;r  
   KeyCount++; ]y)Q!J )Q  
   break; 1(GHCxA8G  
  } ` e{BId  
 } qturd7  
 return bAdded; D;F{1[s(  
} 7yiJ1K<bIt  
SHqyvF  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) IdRdW{o  
{ Lg`Jp&Kg  
 BOOL bRemoved=FALSE; g42R 'E%  
 for(int index=0;index<MAX_KEY;index++){ @#b0T:+v'  
  if(hCallWnd[index]==hWnd){ Oz:ZQ M  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ qG >DTKIU  
    hCallWnd[index]=NULL; <-jGqUN_I  
    HotKey[index]=0; kJ: 2;t=  
    HotKeyMask[index]=0; T"E(  F  
    bRemoved=TRUE; /k7wwZiY@  
    KeyCount--; cc >  
    break; d\XRUO[  
   } CYB=Uq,  
  } O rk  
 } mR":z|6  
 return bRemoved; voRfjsS~  
} j/<??v4F4  
Q59/ex  
void VerifyWindow() K ar~I  
{ u5gZxO1J5  
 for(int i=0;i<MAX_KEY;i++){ yCM{M  
  if(hCallWnd!=NULL){ dB|Te"6  
   if(!IsWindow(hCallWnd)){ o*7yax  
    hCallWnd=NULL; 9|K*G~J  
    HotKey=0; D$_8rHc\A  
    HotKeyMask=0; ~440# kj<  
    KeyCount--; *=^[VV!  
   } |qL;Nu,d  
  } 8 G?b.NE^  
 } L/k40cEI^z  
} BpXEK.Xw  
^~I @ spR4  
BOOL CHookApp::InitInstance() "<dN9l>  
{ .D@/y uV  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); [n<.fw8$b  
 hins=AfxGetInstanceHandle(); ]b\WaS8I  
 InitHotkey(); gLCz]D.'  
 return CWinApp::InitInstance(); 0e9A+&r  
} @dhH;gt.I  
0P:F97"1,  
int CHookApp::ExitInstance() 9XN~Ln@}  
{ cJq<9(  
 VerifyWindow(); j[T%'%  
 UnInit(); S^g]:Xh&  
 return CWinApp::ExitInstance(); w})NmaT;YF  
} 5k`e^ARf  
v j@V !j?  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file "w1(g=n  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) rH^/8|}&s  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ g&aT!%QvX+  
#if _MSC_VER > 1000 'h:!m/1  
#pragma once >?Qxpqf2  
#endif // _MSC_VER > 1000 Gm*Uv6?H?  
h&'J+b  
class CCaptureDlg : public CDialog L3' \r  
{ C_89YFn+  
 // Construction G32_FQ$ b  
 public: kBUufV~  
  BOOL bTray; ^"/Dih\_  
  BOOL bRegistered; 4jD\]Q="1  
  BOOL RegisterHotkey(); \Em-.%c  
  UCHAR cKey; )muv;Rf`e5  
  UCHAR cMask; [@s=J)H  
  void DeleteIcon(); IM2/(N.%  
  void AddIcon(); _.hIv8V  
  UINT nCount; 7@\GU]. 2  
  void SaveBmp(); hG[4O3jo\  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor )m>6hk  
  // Dialog Data f@#w{W,3  
  //{{AFX_DATA(CCaptureDlg) I[a%a!QO  
  enum { IDD = IDD_CAPTURE_DIALOG }; 7a27^b  
  CComboBox m_Key; >cSi/a,L  
  BOOL m_bControl; 1pl2;!  
  BOOL m_bAlt; MgSp.<!  
  BOOL m_bShift; SSo~.)J  
  CString m_Path; TosPk(o(  
  CString m_Number; Z@8MhJ  
  //}}AFX_DATA W=!F8g|Qz  
  // ClassWizard generated virtual function overrides re2Fv:4{  
  //{{AFX_VIRTUAL(CCaptureDlg) Ig='a"%  
 public: j `w;z: G  
  virtual BOOL PreTranslateMessage(MSG* pMsg); >zN" z)  
 protected: qb 46EZu  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support `8qT['`#R  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); |A2W8b {]  
  //}}AFX_VIRTUAL QGu7D #%|  
  // Implementation {: Am9B  
 protected: P<TpG0~(  
  HICON m_hIcon; {A !;W  
  // Generated message map functions y_;]=hEL  
  //{{AFX_MSG(CCaptureDlg) 5n-9#J$  
  virtual BOOL OnInitDialog(); *tIdp`xT/T  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ?nj"Ptzs  
  afx_msg void OnPaint(); {-:4O\/  
  afx_msg HCURSOR OnQueryDragIcon(); w50.gr7  
  virtual void OnCancel(); f/$-Nl.  
  afx_msg void OnAbout(); dVjcK/T<  
  afx_msg void OnBrowse(); !- Cs?  
  afx_msg void OnChange(); _3-RoA'UZr  
 //}}AFX_MSG YqK+F=0  
 DECLARE_MESSAGE_MAP() rQ 9?N^&!%  
}; /gMa"5?,  
#endif :e5:\|5*5  
U4 go8  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file mgJ]@s}9  
#include "stdafx.h" F}VS)  
#include "Capture.h" d&$.jk8 2  
#include "CaptureDlg.h" JI{OGr  
#include <windowsx.h> ZEXj|wC  
#pragma comment(lib,"hook.lib") @ U7#, G  
#ifdef _DEBUG >b/k|?xP  
#define new DEBUG_NEW fwar8 i1  
#undef THIS_FILE $; KQY7  
static char THIS_FILE[] = __FILE__; cP$wI;P  
#endif {d *qlztO  
#define IDM_SHELL WM_USER+1 5Xq.=/eX  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); w|K(>5nz  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); troy^H  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; P^uP$D  
class CAboutDlg : public CDialog -E,{r[Sp  
{ CguU+8 ]  
 public: uHujw.H/y  
  CAboutDlg(); /S2p``E+  
  // Dialog Data }tl8(kjm  
  //{{AFX_DATA(CAboutDlg) nEa'e5 lg  
  enum { IDD = IDD_ABOUTBOX }; ;_Of`C+  
  //}}AFX_DATA b'Piymx  
  // ClassWizard generated virtual function overrides GakmROZ@9  
  //{{AFX_VIRTUAL(CAboutDlg) ]w&?k:y>  
 protected: z wniS6R1  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ]'bQ(<^#  
  //}}AFX_VIRTUAL ki][qvXJ  
  // Implementation JE8p5WaR  
 protected: g)zn.]  
  //{{AFX_MSG(CAboutDlg) %+j]vP  
  //}}AFX_MSG :n%sU* 'T  
  DECLARE_MESSAGE_MAP() >R'VY "\  
}; A$9_aqbj  
1rvf\[  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) vY+_tpuEH  
{ #mz,HK0|aC  
 //{{AFX_DATA_INIT(CAboutDlg) p;QX"2  
 //}}AFX_DATA_INIT KWuj_.;  
} l2KxZteXY0  
4- ?`#  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 'zD;:wT  
{ O ]4 x;`)  
 CDialog::DoDataExchange(pDX); 0Ts_"p  
 //{{AFX_DATA_MAP(CAboutDlg) I!i#=  
 //}}AFX_DATA_MAP ~sU! 1  
} %>*0.)wG  
}FdcbNsP  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) }s)&/~6  
 //{{AFX_MSG_MAP(CAboutDlg) 7<C~D,x6  
 // No message handlers A1s=;qr  
 //}}AFX_MSG_MAP V2sB[Mw  
END_MESSAGE_MAP() >|o9ggL`J5  
Q!A3hr$IF  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) A%2M]];%X  
: CDialog(CCaptureDlg::IDD, pParent) 'I01F:`  
{ )V =K#MCK  
 //{{AFX_DATA_INIT(CCaptureDlg) @ 6VH%  
  m_bControl = FALSE; JgjL$n;F  
  m_bAlt = FALSE; iJj?~\zp  
  m_bShift = FALSE; CR8r|+(8  
  m_Path = _T("c:\\"); %K f . F  
  m_Number = _T("0 picture captured."); u B%^2{uU  
  nCount=0; ^1& LHrT  
  bRegistered=FALSE; `/j|Rb|eow  
  bTray=FALSE; GWE0 UO}  
 //}}AFX_DATA_INIT ~FrkLP  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 JX,#W!d  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); i I Nu`>I  
} $Aoqtz d\  
"Ohpb!J9  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 3f.Gog  
{ v+_Y72h*a  
 CDialog::DoDataExchange(pDX); oX~$'/2v  
 //{{AFX_DATA_MAP(CCaptureDlg) W[Ew6)1T  
  DDX_Control(pDX, IDC_KEY, m_Key); W%Nu]9T  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 7D_kkhN  
  DDX_Check(pDX, IDC_ALT, m_bAlt); !U~#H_  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); &)}:Y!qiu  
  DDX_Text(pDX, IDC_PATH, m_Path); z ex.0OT;  
  DDX_Text(pDX, IDC_NUMBER, m_Number); cb&In<q  
 //}}AFX_DATA_MAP )0V]G{QN  
} 2_~XjwKE  
csA.3|rv  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) r!gCh`PiK  
//{{AFX_MSG_MAP(CCaptureDlg) IMw)X0z  
 ON_WM_SYSCOMMAND() qvT+d l3#[  
 ON_WM_PAINT() }uj'BO2?  
 ON_WM_QUERYDRAGICON() Wk#-LkI  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) gJ~*rWBK:  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) W$&Ets8zo  
 ON_BN_CLICKED(ID_CHANGE, OnChange) uB"m!dL  
//}}AFX_MSG_MAP 3Ty{8oUs^  
END_MESSAGE_MAP() @[Qg}'i  
Sq]1SW3  
BOOL CCaptureDlg::OnInitDialog() b'"%   
{ >gLy z2  
 CDialog::OnInitDialog(); L k+1r8  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); _ShJ3\,K  
 ASSERT(IDM_ABOUTBOX < 0xF000); 3t6'5{  
 CMenu* pSysMenu = GetSystemMenu(FALSE); QHz76i!=>  
 if (pSysMenu != NULL) ;//q jo  
 { \-id[zKb  
  CString strAboutMenu; w:@M|O4`  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 3YF]o9  
  if (!strAboutMenu.IsEmpty()) = +\oL!^  
  { -T6%3>h  
   pSysMenu->AppendMenu(MF_SEPARATOR); y9 ' 3vZ  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); {oeQK   
  } v@SrEmg  
 } 3!UP>,!  
 SetIcon(m_hIcon, TRUE); // Set big icon 1k({(\>qq  
 SetIcon(m_hIcon, FALSE); // Set small icon Ot<!YM  
 m_Key.SetCurSel(0); }=4".V`-o  
 RegisterHotkey(); pD/S\E0@t  
 CMenu* pMenu=GetSystemMenu(FALSE); oIgj)AY<  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); tC~itU=V  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); WF0>R^SpZ  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); O:R{4Q*5  
 return TRUE; // return TRUE unless you set the focus to a control |mA*[?ye@  
} %/C[\w p81  
Ro$XbU)  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Lj,%pzJ  
{ >GRuS\B  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) [! BH3J!  
 { y~ LVK8  
  CAboutDlg dlgAbout; 'm:B(N@+  
  dlgAbout.DoModal(); _s,svQ8#  
 } gC 4#!P  
 else e /Y+S;a  
 { (#`o >G(  
  CDialog::OnSysCommand(nID, lParam); Rw% KEUDm  
 } q;JQs:U!  
} Xs_y!l  
[X]o`  
void CCaptureDlg::OnPaint() v$Z1Lh  
{ LOzKpvGl  
 if (IsIconic()) 1)ne-e  
 { ;zODp+4@Q  
  CPaintDC dc(this); // device context for painting {D< ?.'  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); TXv#/@  
  // Center icon in client rectangle ^u{$$.&  
  int cxIcon = GetSystemMetrics(SM_CXICON); Vo[4\h#$  
  int cyIcon = GetSystemMetrics(SM_CYICON); {\I \4P  
  CRect rect; !}?]&[N=  
  GetClientRect(&rect); 471}'3  
  int x = (rect.Width() - cxIcon + 1) / 2; (ShJ!  
  int y = (rect.Height() - cyIcon + 1) / 2; !hUyX}{`j  
  // Draw the icon f0+  
  dc.DrawIcon(x, y, m_hIcon); 9:s!#FYFM  
 } ?Fu.,srt  
 else Ns(F%zkm  
 { r9[J3t*({~  
  CDialog::OnPaint(); .rHO7c,P~  
 } wC~Uy%  
} IT|CfQ [D  
;C'*Ui  
HCURSOR CCaptureDlg::OnQueryDragIcon() 1)y}.y5S  
{ r>\.b{wI  
 return (HCURSOR) m_hIcon; 62) F  
} zF7T5 Ge  
ko$R%W&T  
void CCaptureDlg::OnCancel() t*#T~3p  
{ 4j5plm=  
 if(bTray) &CgD smJo#  
  DeleteIcon(); vHmn)d1pl  
  CDialog::OnCancel(); G(i/ @>l  
} Sj\8$QIXC  
Yhfk{CI  
void CCaptureDlg::OnAbout() 90a= 39kI  
{ W;7cF8fu4  
 CAboutDlg dlg; R4?/7  
 dlg.DoModal(); <pCZ+Yv E"  
} K2JS2Y]  
:B im`mHl  
void CCaptureDlg::OnBrowse() =x> KA*O1  
{ V0>,Kxk  
 CString str; hz!.|U@,{<  
 BROWSEINFO bi; t+t&eg  
 char name[MAX_PATH]; Y&nY]VV  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 8Pq|jK "  
 bi.hwndOwner=GetSafeHwnd(); YRFM1?*  
 bi.pszDisplayName=name; o 0B`~7(  
 bi.lpszTitle="Select folder"; 1jR<H$aS  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; S[Et!gj:  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ] '..G-  
 if(idl==NULL) K=V)"v5o3  
  return; 0=NB[eG  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); $4m{g"xL  
 str.ReleaseBuffer(); 0oD?4gn  
 m_Path=str; 'Q# KjY  
 if(str.GetAt(str.GetLength()-1)!='\\') (c;$^xZK  
  m_Path+="\\"; -70Ut 4B  
 UpdateData(FALSE); `3~w#?+=*  
} 3/iGSG`  
^vUdf.n9  
void CCaptureDlg::SaveBmp() I/c* ?  
{ |,o!O39}>  
 CDC dc; ~%cbp&s*/q  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); DF<_Ns!  
 CBitmap bm; N G4wtDa  
 int Width=GetSystemMetrics(SM_CXSCREEN); xRb-m$B}L  
 int Height=GetSystemMetrics(SM_CYSCREEN); UPH:$Fk&  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 7P=j2;7 v  
 CDC tdc; "[76>\'H  
 tdc.CreateCompatibleDC(&dc); |VIBSty2d  
 CBitmap*pOld=tdc.SelectObject(&bm); R ~#\gMs  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Ef69]{E  
 tdc.SelectObject(pOld); e(sQgtM6  
 BITMAP btm; M^a QH/=:"  
 bm.GetBitmap(&btm); :WE(1!P@  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ^b'[ 81%  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Eg>MG87  
 BITMAPINFOHEADER bih; ^J?I-LG  
 bih.biBitCount=btm.bmBitsPixel; t68h$u  
 bih.biClrImportant=0; RV-7y^[]^  
 bih.biClrUsed=0; rk `x81  
 bih.biCompression=0; Ao2t=vg  
 bih.biHeight=btm.bmHeight; ,JX/` 7y  
 bih.biPlanes=1; nI&Tr_"tm  
 bih.biSize=sizeof(BITMAPINFOHEADER); WI ' ;e4  
 bih.biSizeImage=size; |nIm$p'  
 bih.biWidth=btm.bmWidth; KnKV+:"  
 bih.biXPelsPerMeter=0; \f .ceh;!  
 bih.biYPelsPerMeter=0; 49cQA$Ad  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); |d&a&6U:  
 static int filecount=0; Ry8@U9B6,t  
 CString name; }sZme3*J[  
 name.Format("pict%04d.bmp",filecount++); [;%qxAB/_  
 name=m_Path+name; $3k5hDA0e  
 BITMAPFILEHEADER bfh; vzG(u_,9[  
 bfh.bfReserved1=bfh.bfReserved2=0; SnRk` 5t  
 bfh.bfType=((WORD)('M'<< 8)|'B'); \^i/:  
 bfh.bfSize=54+size; YLk/16r  
 bfh.bfOffBits=54; se2ay_<F+  
 CFile bf; G<U MZg  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ $5Jo %K%  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); *%bQp  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); u?r=;:N|y  
  bf.WriteHuge(lpData,size); ^^1rjh1I  
  bf.Close(); 0P_qtS  
  nCount++; ED [` Y.;  
 } }j;*7x8(  
 GlobalFreePtr(lpData); .IXkdy  
 if(nCount==1) CvS}U%   
  m_Number.Format("%d picture captured.",nCount); H:TRJ.!w2  
 else [9Q}e;T  
  m_Number.Format("%d pictures captured.",nCount); 80DcM9^t8  
  UpdateData(FALSE); Zl^#U c"  
} $)8b)Tb  
9)}Nx>K  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) b ;A(6^V  
{ C7:;<<"P  
 if(pMsg -> message == WM_KEYDOWN) dz3chy,3  
 { pCb3^# &o  
  if(pMsg -> wParam == VK_ESCAPE) U51C /A  
   return TRUE; @ W[LA<  
  if(pMsg -> wParam == VK_RETURN) ancs  
   return TRUE; +X#JCLD  
 } K)"lq5nM  
 return CDialog::PreTranslateMessage(pMsg); f sRRnD  
} rXgU*3 RG  
X} <p|P+  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) kB:6e7D|[  
{ :.u[^_   
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ !0p_s;uu,W  
  SaveBmp(); *c<0cHv*  
  return FALSE; MOp06  
} ~ A?  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ lM/)<I\8  
 CMenu pop;  # ub!  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); H & L  
 CMenu*pMenu=pop.GetSubMenu(0); 33/aYy  
 pMenu->SetDefaultItem(ID_EXITICON); g<d#zzP"T  
 CPoint pt; A|Z'\D0  
 GetCursorPos(&pt); o$ disJ  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); CI%4!K;{  
 if(id==ID_EXITICON) uv>T8(w  
  DeleteIcon(); |1M+FBT$w  
 else if(id==ID_EXIT) vMT:j  
  OnCancel(); "'i" @CR  
 return FALSE; }fzv9$]$  
} rsSE*(T t  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); )}`3haG  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) {6E&\  
 AddIcon(); r92C^h0  
 return res; @-9u;aL  
} HH`G/(a  
(rDB|kc^7  
void CCaptureDlg::AddIcon() T;{M9W+  
{ c^Y&4=>T  
 NOTIFYICONDATA data; wlvhDJ  
 data.cbSize=sizeof(NOTIFYICONDATA); e[`u:  
 CString tip; Qqju6}+  
 tip.LoadString(IDS_ICONTIP); P01o:/}  
 data.hIcon=GetIcon(0); F^knlv'  
 data.hWnd=GetSafeHwnd(); kWkAfzf4a  
 strcpy(data.szTip,tip); YTWlR]Tr6?  
 data.uCallbackMessage=IDM_SHELL; Pi^5LI6JW  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ^#:F8D  
 data.uID=98; SY: gr  
 Shell_NotifyIcon(NIM_ADD,&data); YS7R8|  
 ShowWindow(SW_HIDE); IG}`~% Z  
 bTray=TRUE; iobL6SUZ  
} 5 *w a  
#a : W  
void CCaptureDlg::DeleteIcon() "otks\I<  
{ gA`x-`  
 NOTIFYICONDATA data; u>e4;f`F  
 data.cbSize=sizeof(NOTIFYICONDATA); kaK0'l2%  
 data.hWnd=GetSafeHwnd(); G?`x$UU  
 data.uID=98; RfM uWo:  
 Shell_NotifyIcon(NIM_DELETE,&data); -&3WN!egq  
 ShowWindow(SW_SHOW); H ?ZlJ|/c  
 SetForegroundWindow(); ` #!~+  
 ShowWindow(SW_SHOWNORMAL); Ujw J}j  
 bTray=FALSE; }1N $4@  
} vO2I"Y*\  
C9?R*2L>  
void CCaptureDlg::OnChange() !%pY)69gv  
{ +s(JutC  
 RegisterHotkey(); 4s{_(gy  
} y]z^e\qc)  
WGG Va  
BOOL CCaptureDlg::RegisterHotkey() mn5"kYy?  
{ M@LI(;  
 UpdateData(); !kzC1U  
 UCHAR mask=0; 86.LkwlqoH  
 UCHAR key=0; xUp[)B6?:  
 if(m_bControl) D'dE!CAUs  
  mask|=4; *T acV p  
 if(m_bAlt) N;)Y+amg^  
  mask|=2; h"b;e2  
 if(m_bShift) .Vy*p")"  
  mask|=1; Y ;JP r  
  key=Key_Table[m_Key.GetCurSel()];  }YPW@g  
 if(bRegistered){ 1Tn0$+$.4  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); S}0W<H P  
  bRegistered=FALSE; Yn0l}=, n  
 } q;Y9_5S  
 cMask=mask; CTqAhL 4}  
 cKey=key; pH#*:v!)  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); yS*s[vT  
 return bRegistered; st8=1}:&\  
} [P'crV,m  
cy R K&J  
  四、小结 32DSZ0  
Sk*-B@!S  
  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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