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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: MKD1V8i  
  Y0dEH^I  
  一、实现方法 x,@B(9No  
Gd xnpE  
  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]e8a"/[{  
g63(E,;;J  
#pragma data_seg("shareddata") /cQueUME`  
HHOOK hHook =NULL; //钩子句柄 _P 3G  
UINT nHookCount =0; //挂接的程序数目 B:S>wFE(.  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 i0kak`x0  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 }t=!(GOb}  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey }9#r0Vja  
static int KeyCount =0; pis`$_kmwV  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 1N#| }ad  
#pragma data_seg() g-</ua(j  
DIfaVo/"  
  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。 ^]0Pfna+N  
:tB1D@Cb6  
  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: c&?m>2^6  
/}fHt^2H  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 8hz^%vm  
cKey,UCHAR cMask) G kl71VX  
{ %i9E @EV  
 BOOL bAdded=FALSE; GxI!{oi2  
 for(int index=0;index<MAX_KEY;index++){ U} e!Wjrc  
  if(hCallWnd[index]==0){ PI:4m%[  
   hCallWnd[index]=hWnd; K6/Q}W   
   HotKey[index]=cKey; CR`Q#Yi  
   HotKeyMask[index]=cMask; RYQR(v  
   bAdded=TRUE; t?-n*9,#S  
   KeyCount++; BB!THj69a6  
   break; j<99FW"@e  
  } fo#fg8zX%  
 } BxWPC#5  
 return bAdded; HU8900k+  
} n,V[eW#m'L  
//删除热键 p{ Yv3dNl  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) F^t DL:  
{ wc NOLUl  
 BOOL bRemoved=FALSE; "fCu=@i  
 for(int index=0;index<MAX_KEY;index++){ p;59?  
  if(hCallWnd[index]==hWnd){ gx8ouOh  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ k"T}2 7  
    hCallWnd[index]=NULL; $m%f wB  
    HotKey[index]=0; mAj?>;R2$2  
    HotKeyMask[index]=0; T@:Wp4>69  
    bRemoved=TRUE; jrlVvzZ  
    KeyCount--; ~Ei$nV  
    break; ,]ma+(|  
   } UXc-k  
  } hz;G$cuEE  
 } h-#6av :  
 return bRemoved; nwB_8mN|  
} QT< }] 0  
1R{!]uh  
,.83m%i  
  DLL中的钩子函数如下: X<`  
1EO7H{E=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) pMx*F@&nU  
{ I {S;L  
 BOOL bProcessed=FALSE; HZzDVCU  
 if(HC_ACTION==nCode) G_3O]BMKd)  
 { iZ3IdiZ  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 /7nb,!~~l  
   switch(wParam) 3nIU1e  
   {  fo*2:?K&  
    case VK_MENU: +eWQa`g  
     MaskBits&=~ALTBIT; q#Z@+(^  
     break; J{p1|+h%  
    case VK_CONTROL: 6y%qVx#!  
     MaskBits&=~CTRLBIT; g 2LM_1\  
     break; pXT4)JDpc  
    case VK_SHIFT: ^pAAzr"hv  
     MaskBits&=~SHIFTBIT; E"\<s3  
     break; %Q__!D[  
    default: //judge the key and send message {7"Q\  
     break; n/;WxnnQ  
   } ]_mb7X>  
   for(int index=0;index<MAX_KEY;index++){ lk^Ol&6  
    if(hCallWnd[index]==NULL) ~:rl=o}  
     continue; $Uq|w[LA  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -[4T  
    { G\/zkrxmv  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Xy|So|/bKd  
     bProcessed=TRUE; _wbF>z  
    } n71r_S*  
   } gq4Tb c oA  
  } \%JgH=@ :=  
  else if((lParam&0xc000ffff)==1){ //有键按下 M)J5;^["  
   switch(wParam) 9-VNp;V  
   { -j# 2}[J7  
    case VK_MENU: iW]j9}t  
     MaskBits|=ALTBIT; v}}F,c(f  
     break; :}L[sl\R  
    case VK_CONTROL: b$d;Qx  
     MaskBits|=CTRLBIT; '%s.^kn  
     break; sQ UM~HD\a  
    case VK_SHIFT: `quw9j9`C\  
     MaskBits|=SHIFTBIT; ~RW+ GTe  
     break; ~WeM TXF>y  
    default: //judge the key and send message m)ky*"(  
     break; Q Uwd [  
   } A2I9R;}  
   for(int index=0;index<MAX_KEY;index++){ ,8S/t+H  
    if(hCallWnd[index]==NULL) =57>!)  
     continue; oA7tE u   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) n$MO4s8)  
    { (Z+.45{-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); XO>KZV7)  
     bProcessed=TRUE; 6y-@iJ*ld;  
    } 4M=]wR;  
   } rT=rrvV3g  
  } ?qv !w~m<  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 <,3a3  
   for(int index=0;index<MAX_KEY;index++){ BA@lk+aW  
    if(hCallWnd[index]==NULL) FZ{h?#2?  
     continue; [SjqOTon{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) %+aCJu[k(z  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); (+w*[qHe  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 G)AqbY  
   } MD}w Y><C  
  } f&N gS+<K$  
 } px A?  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); A9KET$i@v  
} .Yamc#A-  
>2y':fO  
  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: %8RrRW  
A]_7}<<N  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 2jA{SY-  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); v^sv<4*%  
!4ocZmj\  
  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: KaLzg5is  
Z\(q@3C  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) -vAC"8)S  
{ AmUr.ofu  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) rX U  
 { [$ubNk;!z  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 lB8-Z ow  
  SaveBmp(); lne|5{h  
  return FALSE; ")1:F>  
 } o@_q]/Mh  
 …… //其它处理及默认处理 y B81f  
} ~T"Rw2v b  
H9Gh>u]}  
RF?`vRZOe  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 sbfuzpg]*  
77 Q5d"sIi  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 /m!BY}4W  
#JqB ;'\  
  二、编程步骤 <X#C)-.  
^7`BP%6  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; [>vLf2OID  
~V:\ _{mE  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; N_LM/of|D  
WSP I|#Xr%  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 8$] 1M,$r  
n.}ZkG0`  
  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; 7RQR)DG  
"-E\[@/  
  5、 添加代码,编译运行程序。 &.F4 b~A7  
`{8K.(])s!  
三、程序代码 1;* cq  
FBG4pb9=~  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL K$z2YJ%  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) `C,n0'PL.  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ x[| }.Ew  
#if _MSC_VER > 1000  > ^O7  
#pragma once \Zb;'eDv  
#endif // _MSC_VER > 1000 ImA @}:  
#ifndef __AFXWIN_H__ 2/U.| *mH  
#error include 'stdafx.h' before including this file for PCH qRu~$K  
#endif -D<< kra  
#include "resource.h" // main symbols Q@=Q0  
class CHookApp : public CWinApp zWnX*2>b  
{ xPdG*OcX!  
 public: \wmN  
  CHookApp(); wC"FDr+  
  // Overrides M+oHtX$  
  // ClassWizard generated virtual function overrides XjBW9a  
  //{{AFX_VIRTUAL(CHookApp) 05|=`eJ  
 public: )|cc X  
  virtual BOOL InitInstance(); \a<wKTkn  
  virtual int ExitInstance(); hy9\57_#  
  //}}AFX_VIRTUAL 1l9 G[o *  
  //{{AFX_MSG(CHookApp) *nd!)t  
  // NOTE - the ClassWizard will add and remove member functions here. UklUw  
  // DO NOT EDIT what you see in these blocks of generated code ! _OYasJUMG  
  //}}AFX_MSG l#&8x  
  DECLARE_MESSAGE_MAP() j<upRS,$  
}; >:SHV W  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); g%o(+d  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ]iVcog"T  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 2y75  
BOOL InitHotkey(); NCveSP  
BOOL UnInit(); )',R[|<  
#endif -+-?w|}qV  
YH$-g  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 53_Hl]#qZ  
#include "stdafx.h" 7K12 G!)  
#include "hook.h" }f%}v  
#include <windowsx.h> cUk7i`M;6  
#ifdef _DEBUG `Uq#W+r,  
#define new DEBUG_NEW vN}#Kc\  
#undef THIS_FILE O}gV`q;  
static char THIS_FILE[] = __FILE__; ~ZaY!(R<  
#endif eNh39er  
#define MAX_KEY 100 ^+ml5m  
#define CTRLBIT 0x04 WH%g(6w1j  
#define ALTBIT 0x02 cs48*+m  
#define SHIFTBIT 0x01 _r#Z}HK  
#pragma data_seg("shareddata") ZT*ydln  
HHOOK hHook =NULL; '(6z. toQ  
UINT nHookCount =0; yHYsZ,GE  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey `K"L /I9  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT v4<nI;Ux  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 5{TsiZh4  
static int KeyCount =0; 3l]lwV  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 'B$yo]  
#pragma data_seg() _1X!EH"  
HINSTANCE hins; BX/8O<s0  
void VerifyWindow(); #&+{mCjs  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) T}Tp$.gB  
//{{AFX_MSG_MAP(CHookApp) 3=#<X-);  
// NOTE - the ClassWizard will add and remove mapping macros here. E#RDqL*J  
// DO NOT EDIT what you see in these blocks of generated code! xH4m|  
//}}AFX_MSG_MAP xa'*P=<)C'  
END_MESSAGE_MAP() F-QzrquS  
Xxj- 6i  
CHookApp::CHookApp() 8bGd} (  
{ Mc lkEfn  
 // TODO: add construction code here, thh. A  
 // Place all significant initialization in InitInstance R>|{N9  
} Ng&%o  
- nm"of\o  
CHookApp theApp; 2YL?,uLS  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) eSn+B;  
{ 1y &\5kB  
 BOOL bProcessed=FALSE; @3i\%R)n;  
 if(HC_ACTION==nCode) J6"9v;V  
 { -]Bq|qTH[(  
  if((lParam&0xc0000000)==0xc0000000){// Key up >tS'Q`R  
   switch(wParam) *][`@@->  
   { J`Q>3] wL  
    case VK_MENU: 3m[vXr?  
     MaskBits&=~ALTBIT; 63iUi9P  
     break; ho{*Cjv  
    case VK_CONTROL: UBKu /@[f@  
     MaskBits&=~CTRLBIT; n6=By|jRh  
     break; Wb,KjtX  
    case VK_SHIFT: },?kk1vIT{  
     MaskBits&=~SHIFTBIT; f^ZRT@`O  
     break; >~rTqtKd  
    default: //judge the key and send message Oxnp0 s  
     break; FgnTGY}  
   } 2ACCh4(/P  
   for(int index=0;index<MAX_KEY;index++){ R+:yVi[F]U  
    if(hCallWnd[index]==NULL) of~4Q{f$6  
     continue; &3>)qul  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) m,28u3@r  
    { lgAoJ[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 5<k"K^0QS  
     bProcessed=TRUE; ~\SGb_2  
    } OnziG+ak  
   } $p8xEcQdU#  
  } T~?Ff|qFC  
  else if((lParam&0xc000ffff)==1){ //Key down ' {OgN}'{  
   switch(wParam) >{ ]%F*p4  
   { G5_=H,Vmd  
    case VK_MENU: g'f@H-KCD  
     MaskBits|=ALTBIT; ~D+bh~  
     break; # +>oZWVc  
    case VK_CONTROL: ldcqe$7,  
     MaskBits|=CTRLBIT; 68|E9^`l  
     break; ;}WeTA_-[  
    case VK_SHIFT: mUC)gA/  
     MaskBits|=SHIFTBIT; PQt")[  
     break; M t|zyXyzX  
    default: //judge the key and send message SGRp3,1\4%  
     break; f)rq%N &  
   } KkyVSoD\  
   for(int index=0;index<MAX_KEY;index++) S72+d%$  
   { YaqR[F  
    if(hCallWnd[index]==NULL) 4B;=kL_f  
     continue; @IKYh{j4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) V-P#1Kkh  
    { ;;Y! ^^g  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ,,.QfUj/&  
     bProcessed=TRUE; FXCMR\BsQ  
    } ZoqZap6e  
   } P[-E@0h)-t  
  } Kn{4;Xk\  
  if(!bProcessed){ _ye |Y  
   for(int index=0;index<MAX_KEY;index++){ \\ij(>CI  
    if(hCallWnd[index]==NULL) :G=fl)!fE  
     continue; Ny7S  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) y7cl_rK  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); /<k/7TF`  
   } (/YHk`v2  
  } 0o4XUW   
 } s) t@ol  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); M?49TOQA  
} *R,5h2;  
`hm-.@f,9  
BOOL InitHotkey() ?<,l3pwqa  
{ A2FYBM`Q&D  
 if(hHook!=NULL){ qwcD`HV,  
  nHookCount++; iMh#TUlQEQ  
  return TRUE; qZh/IW  
 } =*.~BG  
 else K3m/(jdO  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); -ad{tJV|  
  if(hHook!=NULL) :kV#y  
   nHookCount++; }#+^{P3;  
  return (hHook!=NULL); }&D WaO]J7  
} kazzVK5x  
BOOL UnInit() 0> E r=,e  
{ rXq.DvQ  
 if(nHookCount>1){ c#]4awHU  
  nHookCount--; 3`?7 <YJ  
  return TRUE; T<>,lQs(a  
 } .43'HV  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Y-z(zS^1  
 if(unhooked==TRUE){ \l0[rcEf  
  nHookCount=0; =%O6:YM   
  hHook=NULL; fbvL7* (  
 } /s?`&1v|r  
 return unhooked; A\DCW  
} DfD&)tsMQ  
^ +\dz  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) #%2rP'He  
{ W*:.Gxv]  
 BOOL bAdded=FALSE; 6_;icpN]  
 for(int index=0;index<MAX_KEY;index++){ MchA{p&Ol  
  if(hCallWnd[index]==0){ h" W,WxL8  
   hCallWnd[index]=hWnd; A{zN | S[  
   HotKey[index]=cKey; (mB&m@-N  
   HotKeyMask[index]=cMask; ,qwuLBW  
   bAdded=TRUE; R\f+SvE  
   KeyCount++; ]/6z; ~3U  
   break; Ix}sK"}[n  
  } e`s ~.ZF  
 } 4J? 0bZ  
 return bAdded; G_JA-@i%  
} 372rbY  
TX/Xt7#R:  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ,p a {qne  
{ 'Is kWgc  
 BOOL bRemoved=FALSE; y^ *~B(T{  
 for(int index=0;index<MAX_KEY;index++){ %;' s4ly  
  if(hCallWnd[index]==hWnd){ .{^5X)  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ^\% (,KNo  
    hCallWnd[index]=NULL; 8,%^ M9zBP  
    HotKey[index]=0; gJ{)-\  
    HotKeyMask[index]=0; Fo_sgv8O<  
    bRemoved=TRUE; ~?}Emn;t  
    KeyCount--; !< ";cw(q  
    break; J;e2&gB  
   } C) s5D  
  } 0+ '&`Q!u  
 } j (d~aqW  
 return bRemoved; "k@/ 3  
} \)[j_^  
& .j&0WE  
void VerifyWindow() ^ytrK Q  
{ JbbzV>  
 for(int i=0;i<MAX_KEY;i++){ 3hH<T.@)  
  if(hCallWnd!=NULL){ =nS3p6>rZ  
   if(!IsWindow(hCallWnd)){ q;CiV  
    hCallWnd=NULL; A)!*]o>U  
    HotKey=0; '<<t]kK[N  
    HotKeyMask=0; L*+@>3mu)  
    KeyCount--; ITBE|b  
   } p l0\2e)  
  } 3$R1ipb  
 } ?l )[7LR4  
} Avc%2 +  
\\qZl)P_  
BOOL CHookApp::InitInstance() 59A}}.@?m  
{ )akoa,#%6c  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); t:Q*gW Rh  
 hins=AfxGetInstanceHandle(); Lq^)R  
 InitHotkey(); {\5  
 return CWinApp::InitInstance(); =T@1@w  
} )10+@d  
# W']6'O  
int CHookApp::ExitInstance() teF9Q+*~  
{ \b x$i*  
 VerifyWindow(); 2ilQXy  
 UnInit(); vE?G7%,  
 return CWinApp::ExitInstance(); q} >%8;nm  
} O>,e~#!  
pnOAs&QAm  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file oPM96 (  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) o*H<KaX  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ bd-L` ={j  
#if _MSC_VER > 1000 7NGxa6wi  
#pragma once i.m^/0!  
#endif // _MSC_VER > 1000 5;EvNu  
,O(hMI85]  
class CCaptureDlg : public CDialog =,M5KDk`  
{ *] X'( /b_  
 // Construction lo+A%\1  
 public: :F?C)F  
  BOOL bTray; %h@EP[\  
  BOOL bRegistered; &8lZNv8;(p  
  BOOL RegisterHotkey(); e7 o.xR  
  UCHAR cKey; 3w'tH4C[Y  
  UCHAR cMask; Nf\LN$ &8  
  void DeleteIcon(); o+'6`g'8  
  void AddIcon(); 0l6.<-f{  
  UINT nCount; (<9u-HF#  
  void SaveBmp(); 8A# ;WG  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 02^rV*re  
  // Dialog Data mzgfFNm^G)  
  //{{AFX_DATA(CCaptureDlg) Zy/_ E@C}u  
  enum { IDD = IDD_CAPTURE_DIALOG }; hgq;`_;1,  
  CComboBox m_Key; 0=YI@@n)  
  BOOL m_bControl; qE"OB  
  BOOL m_bAlt; zDG b7S{  
  BOOL m_bShift; H:| uw  
  CString m_Path; 9'B `]/L  
  CString m_Number; |BXg/gW  
  //}}AFX_DATA Zh~'9 JH  
  // ClassWizard generated virtual function overrides yWSGi#)1  
  //{{AFX_VIRTUAL(CCaptureDlg) x q h  
 public: <hyKu  
  virtual BOOL PreTranslateMessage(MSG* pMsg); /{I$#:M  
 protected: 2,b$7xaf  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support %|oym.-I6  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ccxNbU  
  //}}AFX_VIRTUAL 0y\Z9+G:  
  // Implementation d=/F}yP~?s  
 protected: YmG("z  
  HICON m_hIcon; $`8wJf9@w  
  // Generated message map functions ]SEZaT  
  //{{AFX_MSG(CCaptureDlg) sI2^Qp@O1  
  virtual BOOL OnInitDialog(); Ewz!O`  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); R=?[Nz  
  afx_msg void OnPaint(); d'> x(Yi  
  afx_msg HCURSOR OnQueryDragIcon(); QJ;2ZN,  
  virtual void OnCancel(); t uX|\X  
  afx_msg void OnAbout(); ueNS='+m  
  afx_msg void OnBrowse(); BgT*icd8d  
  afx_msg void OnChange(); c71y'hnT  
 //}}AFX_MSG !4!~L k=  
 DECLARE_MESSAGE_MAP()  bN.Pex  
}; -{vD: Il=6  
#endif EU#^7  
|7~<Is~ *  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file >$7B wO  
#include "stdafx.h" zH r_!~  
#include "Capture.h" Z\sDUJ  
#include "CaptureDlg.h" ]4e;RV-B  
#include <windowsx.h> zt%Mx>V@  
#pragma comment(lib,"hook.lib") z$sGv19pB  
#ifdef _DEBUG cMIEtK`  
#define new DEBUG_NEW 9gIrt 6  
#undef THIS_FILE 6]wIG$j  
static char THIS_FILE[] = __FILE__; eMzk3eOJ  
#endif ar,7S&s H  
#define IDM_SHELL WM_USER+1 5h*p\cl!Y  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {;oPLr+Z  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); J}t%p(mb  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; -?a 26o%e  
class CAboutDlg : public CDialog ]M3yLYK/P  
{ "@n%Z  
 public: dh\P4  
  CAboutDlg(); \M-OC5fQv  
  // Dialog Data O/LXdz0B  
  //{{AFX_DATA(CAboutDlg) !r-F>!~  
  enum { IDD = IDD_ABOUTBOX }; Q2> gU#  
  //}}AFX_DATA : Dp0?&_  
  // ClassWizard generated virtual function overrides *zLMpL_  
  //{{AFX_VIRTUAL(CAboutDlg) 5r0YA IJ  
 protected: lhJ'bYI  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 30{ gI0jk  
  //}}AFX_VIRTUAL p ll)Y  
  // Implementation $[|mGae  
 protected: GvAb`c=  
  //{{AFX_MSG(CAboutDlg) xz]~ jL@-]  
  //}}AFX_MSG a'T;x`b8U,  
  DECLARE_MESSAGE_MAP() dr"1s-D4IQ  
}; ~J]qP#C  
lq uLT6]  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) VU#7%ufu&  
{ jiGTA:v  
 //{{AFX_DATA_INIT(CAboutDlg) pfPz8L.7  
 //}}AFX_DATA_INIT wuBPfb  
}  !u hT  
Gm`8q}<I  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) .)3<Q}>  
{ TqQ[_RKg2  
 CDialog::DoDataExchange(pDX); ^z\cyT%7t  
 //{{AFX_DATA_MAP(CAboutDlg) Nboaf  
 //}}AFX_DATA_MAP OTv)  
} \7_y%HR  
{RPI]DcO/  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) V[V[~;Py  
 //{{AFX_MSG_MAP(CAboutDlg) {..6>fS  
 // No message handlers Ul# r  
 //}}AFX_MSG_MAP N>E_%]Ch  
END_MESSAGE_MAP() n+p }\msH  
x1<|hTPk  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) A}^mdw9  
: CDialog(CCaptureDlg::IDD, pParent) {{1G`;|v 9  
{ =MWHJ'3-/  
 //{{AFX_DATA_INIT(CCaptureDlg) }B^tL$k  
  m_bControl = FALSE; b2*TgnRq  
  m_bAlt = FALSE; u@444Vzg  
  m_bShift = FALSE; `@%LzeGz  
  m_Path = _T("c:\\"); X-/]IH DN  
  m_Number = _T("0 picture captured."); 3U}%2ARo_  
  nCount=0; ;@J}}h'y  
  bRegistered=FALSE; (At$3b6  
  bTray=FALSE; @+DX.9  
 //}}AFX_DATA_INIT fsXy"#mOkD  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 d_ CT $  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); VaPG-n>Vf  
} R!1p^~/  
{)Xy%QV  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) j1Ezf=N6`  
{ 4z)]@:`}z  
 CDialog::DoDataExchange(pDX); {[F A#  
 //{{AFX_DATA_MAP(CCaptureDlg) a.Vuu)+Quw  
  DDX_Control(pDX, IDC_KEY, m_Key); d5-qZ{W  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); <naz+QK'  
  DDX_Check(pDX, IDC_ALT, m_bAlt); [B3RfCV{  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 0 "#HJA44  
  DDX_Text(pDX, IDC_PATH, m_Path); q\)-BXw:  
  DDX_Text(pDX, IDC_NUMBER, m_Number); T{'RV0%   
 //}}AFX_DATA_MAP 0\$2X- c  
} 1x^GWtRp  
{+Jv+J9  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Hp?/a?\Xm  
//{{AFX_MSG_MAP(CCaptureDlg) #E]59_  
 ON_WM_SYSCOMMAND() 4K74=r),i  
 ON_WM_PAINT() *ui</+  
 ON_WM_QUERYDRAGICON() x^CS"v7  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) W l4%GB  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ?ubro0F:  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 5-M-X#(  
//}}AFX_MSG_MAP AwN!;t_0+N  
END_MESSAGE_MAP() !'Kj x  
LQ% `c  
BOOL CCaptureDlg::OnInitDialog() \NC3'G:Ii  
{ nFn5v'g  
 CDialog::OnInitDialog(); N g,j#  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); }7X%'Bg=M  
 ASSERT(IDM_ABOUTBOX < 0xF000); E"0>yl)  
 CMenu* pSysMenu = GetSystemMenu(FALSE); >d6|^h'0  
 if (pSysMenu != NULL) adw2x pj  
 { .(vwIb8\_  
  CString strAboutMenu; {Ha57Wk8D  
  strAboutMenu.LoadString(IDS_ABOUTBOX); M3AXe]<eC1  
  if (!strAboutMenu.IsEmpty()) Pc9H0\+Xk  
  { &{i{XcqH'  
   pSysMenu->AppendMenu(MF_SEPARATOR); ;rS{:  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); F[0]/  
  } ~ K=b\xc^  
 } Mp]rUPK  
 SetIcon(m_hIcon, TRUE); // Set big icon pJ{Y lS{  
 SetIcon(m_hIcon, FALSE); // Set small icon W>LR\]Ti@  
 m_Key.SetCurSel(0); D,6:EV"sa  
 RegisterHotkey(); t&p|Ynz?i  
 CMenu* pMenu=GetSystemMenu(FALSE); +h$ 9\  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); _-\#i  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 4I7>f]=)  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); #/]nxW.S  
 return TRUE; // return TRUE unless you set the focus to a control ;Xw~D_uv  
} d'2A,B~_*  
~5g~;f[4  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) `{Ul!  
{ 1Z;iV<d  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) c9Yrw^  
 { 8_F1AU? u  
  CAboutDlg dlgAbout; <QvOs@i*  
  dlgAbout.DoModal();  @8 6f  
 } A=4OWV?  
 else / j^  
 { $J2Gf(RU  
  CDialog::OnSysCommand(nID, lParam); n*$ g]G$  
 } Je{ykL?N  
} v2?ZQeHr_(  
5)E @F9N  
void CCaptureDlg::OnPaint() S[N5 ikg  
{ W4N{S.#!  
 if (IsIconic()) F5Va+z,jg  
 { +qoRP2  
  CPaintDC dc(this); // device context for painting b]y2+A.n  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); _g. {MTQ  
  // Center icon in client rectangle Y0>y8U V  
  int cxIcon = GetSystemMetrics(SM_CXICON); Z}QB.$&  
  int cyIcon = GetSystemMetrics(SM_CYICON); % `3jL7|  
  CRect rect; xfQ1T)F3g  
  GetClientRect(&rect); [vgtc.V  
  int x = (rect.Width() - cxIcon + 1) / 2; wj+*E6o-n  
  int y = (rect.Height() - cyIcon + 1) / 2; $^ P0F9~0  
  // Draw the icon ZW}_DT0  
  dc.DrawIcon(x, y, m_hIcon); l ,8##7  
 } MPV5P^@X  
 else nR~(0G,H  
 { nK,w]{<wG!  
  CDialog::OnPaint(); hQ i2U  
 } }*-@!wc-N  
} 9iq_rd]  
o@Oqm>]SS  
HCURSOR CCaptureDlg::OnQueryDragIcon() nlYNN/@"  
{ OCUr{Nh  
 return (HCURSOR) m_hIcon; kl`W\tF  
} HhpDR  
68 sB )R  
void CCaptureDlg::OnCancel() ;fJ.8C  
{ TN.rrop`#g  
 if(bTray) /\Ef%@  
  DeleteIcon(); 9UkBwS`  
  CDialog::OnCancel(); @VBcJ{e,  
} "#]$r  
:0ep( <|;  
void CCaptureDlg::OnAbout() +H.`MZ=  
{ ]A"h&`Cvt  
 CAboutDlg dlg; Ei|\3Kx  
 dlg.DoModal(); ]q.0!lh+WL  
} ZEQEx]Y  
s>en  
void CCaptureDlg::OnBrowse() H.c7Nle  
{ 25T18&R  
 CString str; K;(mC<  
 BROWSEINFO bi; ^"g~-  
 char name[MAX_PATH]; OPi0~s  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ,>M[@4`,U  
 bi.hwndOwner=GetSafeHwnd(); U17d>]ka  
 bi.pszDisplayName=name; ~zgGa:uU  
 bi.lpszTitle="Select folder"; q<J~~'  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; y(&Ac[foS}  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 6mE\OS-I  
 if(idl==NULL) XkqCZHYkS  
  return; ;*N5Y}?j'  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ),)lzN%!  
 str.ReleaseBuffer(); <GJbmRc|  
 m_Path=str; y9;Yiv r)  
 if(str.GetAt(str.GetLength()-1)!='\\') =vPj%oLp'a  
  m_Path+="\\"; Z G:{[sT  
 UpdateData(FALSE); s.#`&Sd>  
} z{6Z 11|  
%C0Dw\A*:  
void CCaptureDlg::SaveBmp() ibw;}^m(  
{ H.;Q+A,8^  
 CDC dc; \!(zrfP{(  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ZC ?Xqp  
 CBitmap bm; n|hNM?v  
 int Width=GetSystemMetrics(SM_CXSCREEN); G B^Br6  
 int Height=GetSystemMetrics(SM_CYSCREEN); 9$Y=orpWxr  
 bm.CreateCompatibleBitmap(&dc,Width,Height); fOHxtHM  
 CDC tdc; 5N]"~w*  
 tdc.CreateCompatibleDC(&dc); jylD6IT  
 CBitmap*pOld=tdc.SelectObject(&bm); [?gP;,  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); RNL9>7xV  
 tdc.SelectObject(pOld); "|NI]Kv  
 BITMAP btm; wq{hF<  
 bm.GetBitmap(&btm); ;|RTx  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Q/?$x*\>  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); [KQi.u  
 BITMAPINFOHEADER bih; Kq!3wb;  
 bih.biBitCount=btm.bmBitsPixel; }b}m3i1  
 bih.biClrImportant=0; jCY %|  
 bih.biClrUsed=0; :]"V-1#}  
 bih.biCompression=0; b$7 +;I;  
 bih.biHeight=btm.bmHeight;  k'YTpO  
 bih.biPlanes=1; zqku e%^?-  
 bih.biSize=sizeof(BITMAPINFOHEADER); 7^285)UQA  
 bih.biSizeImage=size; NHt\ U9l'  
 bih.biWidth=btm.bmWidth; rjP/l6 ~'  
 bih.biXPelsPerMeter=0; 0_/[k*Re  
 bih.biYPelsPerMeter=0; y} '@R$  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); l}h!B_P'  
 static int filecount=0; DDZ@$L!  
 CString name; 0]L"H<W  
 name.Format("pict%04d.bmp",filecount++); m'U0'}Ld};  
 name=m_Path+name; rOYx b }1  
 BITMAPFILEHEADER bfh; MA\V[32H  
 bfh.bfReserved1=bfh.bfReserved2=0; GY*p?k<i  
 bfh.bfType=((WORD)('M'<< 8)|'B'); cNrg#Asen&  
 bfh.bfSize=54+size; 54,er$$V  
 bfh.bfOffBits=54; pCDmXB  
 CFile bf; W)/#0*7  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 5G#n"}T  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); T|$H#n}  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ;a/E42eN;  
  bf.WriteHuge(lpData,size); :0/ 7,i  
  bf.Close(); #4:?gfIj  
  nCount++; o-\[,}T)M  
 } `^vE9nW 7  
 GlobalFreePtr(lpData); km(Po}  
 if(nCount==1) Wqnc{oq |$  
  m_Number.Format("%d picture captured.",nCount); Sz~OX6L  
 else S/ *E,))m  
  m_Number.Format("%d pictures captured.",nCount); gUlo]!$  
  UpdateData(FALSE); +|v90ed  
} ~o(   
wkq 66?  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) .}t e>]A*  
{ kstIgcI  
 if(pMsg -> message == WM_KEYDOWN) ?< />Z)  
 { W^Yxny  
  if(pMsg -> wParam == VK_ESCAPE) D9df=lv mD  
   return TRUE; ~[ jQ!tz  
  if(pMsg -> wParam == VK_RETURN) |pK !S  
   return TRUE; I]575\bA  
 } ' QG?nu  
 return CDialog::PreTranslateMessage(pMsg); R-:2HRaA  
} ?[AD=rUC  
0sqFF[i  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) >z03{=sAN  
{ ]]mJ']l  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ qM`}{ /i  
  SaveBmp(); x:;kSh  
  return FALSE; Q8NX)R  
} e(sk[guvX  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ bOB \--:]  
 CMenu pop; :h$$J lP  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); _w{Qtj~s|  
 CMenu*pMenu=pop.GetSubMenu(0); !VJoM,b8  
 pMenu->SetDefaultItem(ID_EXITICON); Wzh`or  
 CPoint pt; 9Na$W:P c  
 GetCursorPos(&pt); @F eTz[  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); "[k3kAm  
 if(id==ID_EXITICON) +TJCLZ..  
  DeleteIcon(); 8y L Y  
 else if(id==ID_EXIT) zda 3 ,U2o  
  OnCancel(); UZMd~|  
 return FALSE; S!UaH>Rh  
} 3<!7>]A  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); M7T5 ~/4  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) %4H%?4  
 AddIcon();  Sf'CN8  
 return res; I0 -MRU~[K  
} %{|pj +  
:]KAkhFkbb  
void CCaptureDlg::AddIcon() L#J1b!D&<6  
{ fl(wV.Je|  
 NOTIFYICONDATA data; t!XwW$@  
 data.cbSize=sizeof(NOTIFYICONDATA); vt8By@]:  
 CString tip; ]`K2 N  
 tip.LoadString(IDS_ICONTIP); vgPCQO([  
 data.hIcon=GetIcon(0); sT)CxOV  
 data.hWnd=GetSafeHwnd(); Oz95  
 strcpy(data.szTip,tip); Pal=F0-Q\  
 data.uCallbackMessage=IDM_SHELL; &pRREu:[4L  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; %Zi} MPx  
 data.uID=98; $I=~S[p  
 Shell_NotifyIcon(NIM_ADD,&data); N['  .BN  
 ShowWindow(SW_HIDE); tA;}h7/Lc~  
 bTray=TRUE; 8=l%5r^cq  
} kj_c%T ]/  
,prf;|e?  
void CCaptureDlg::DeleteIcon() XTy x r  
{ t# i #(H  
 NOTIFYICONDATA data; b;n[mk  
 data.cbSize=sizeof(NOTIFYICONDATA); az$FnVNn=  
 data.hWnd=GetSafeHwnd(); v+XJ*N[W  
 data.uID=98; (HVGlw'`  
 Shell_NotifyIcon(NIM_DELETE,&data); X8|,   
 ShowWindow(SW_SHOW); DVA:Cmh\  
 SetForegroundWindow(); ;+%rw2Z,B  
 ShowWindow(SW_SHOWNORMAL); r&CiSMS*  
 bTray=FALSE; b9krOe *j  
} S'" Df5  
6Oq 7#3]  
void CCaptureDlg::OnChange() \D4:Nt#  
{ CTb%(<r  
 RegisterHotkey(); ]G\}k  
} AH^/V}9H  
w<#!h6Y=  
BOOL CCaptureDlg::RegisterHotkey() +[VXs~I q  
{ &Jj<h: *  
 UpdateData(); /wp6KXm  
 UCHAR mask=0; `3pW]&  
 UCHAR key=0; 'DR!9De  
 if(m_bControl) eFgA 8kY)  
  mask|=4; 7dWS  
 if(m_bAlt) qPNR`%}Q  
  mask|=2; R_C)  
 if(m_bShift) _f83-':W6  
  mask|=1; ^('wy};  
  key=Key_Table[m_Key.GetCurSel()]; %EH)&k  
 if(bRegistered){ F5<H m_\:  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); V0@=^Bls  
  bRegistered=FALSE; LVGe]lD  
 } Xvu(vA  
 cMask=mask; tw;}jh  
 cKey=key; 1Mzmg[L8  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 'L'R9&o<X  
 return bRegistered; f|5co>Hk  
} 7.Op<  
<E~'.p,  
  四、小结 X'srL j.  
dV_G1'  
  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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