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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: |]]pHC_/W  
  vI:bl~  
  一、实现方法 4{;8 ]/.a  
_ /2 8Cw  
  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: ~:RDw<PWp  
:BZx ) HxQ  
#pragma data_seg("shareddata") oRJP5Y5na  
HHOOK hHook =NULL; //钩子句柄 ;Cp/2A}Xx  
UINT nHookCount =0; //挂接的程序数目 [2H(yLwO  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 *v7& T  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 4[f7X4d$  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Pi]s<3PL  
static int KeyCount =0; J!^~KN6[  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 t73Z3M  
#pragma data_seg() scPq\Qd?O  
,*}g r  
  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。 w$_'xX(  
E*!zJ,@8  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 77=y!SDP  
C6=;(=?C  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR efAahH  
cKey,UCHAR cMask) XtH_+W+O  
{ n-| i  
 BOOL bAdded=FALSE; 8Q)mmkI\=  
 for(int index=0;index<MAX_KEY;index++){ |Nx!g fU  
  if(hCallWnd[index]==0){ K&a]pL6D  
   hCallWnd[index]=hWnd; F# 37Qv  
   HotKey[index]=cKey; *mhw5Z=!  
   HotKeyMask[index]=cMask; 5)zh@aJ@  
   bAdded=TRUE; .]P;fCQmM  
   KeyCount++; &fNE9peQFa  
   break; S bqM=I+  
  } p~zTRnm  
 } YvP"W/5  
 return bAdded; o!_; H}pq  
} .Mft+,"  
//删除热键 `\u),$  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) T[$hYe8%^  
{ $^+KR]\q  
 BOOL bRemoved=FALSE; ^[?+=1 k  
 for(int index=0;index<MAX_KEY;index++){ )b2E/G@X&  
  if(hCallWnd[index]==hWnd){ &+r ;>  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ `GN5QLg#}0  
    hCallWnd[index]=NULL; GHsdLe=t0#  
    HotKey[index]=0; !m O] zn  
    HotKeyMask[index]=0; [F-u'h< *l  
    bRemoved=TRUE; >p#d;wK4_  
    KeyCount--; M Ut^mu$86  
    break; 2D_Vo ])l/  
   } tS/APSY  
  } 6%hEs6-R  
 } [,?A$Z*Z|  
 return bRemoved; f+88R=-u6S  
} K}*p(1$u  
k-PRV8WO  
T+`GOFx  
  DLL中的钩子函数如下: O}iKPY8K  
{aa,#B] i  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) :x5o3xE  
{ Pv$"DEXA2  
 BOOL bProcessed=FALSE; 6g,3s?aT  
 if(HC_ACTION==nCode) d~bH!P  
 { mbG^fy'  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 WF.$gBH"  
   switch(wParam) 1B]wSvP@  
   {  d.(]V2X.J  
    case VK_MENU: IhKas4  
     MaskBits&=~ALTBIT; +z?f,`.*  
     break; .$}zw|,q  
    case VK_CONTROL: 5}^08Xl  
     MaskBits&=~CTRLBIT; L5|;VH  
     break; SE-, 1p  
    case VK_SHIFT: K~~*M?.Z  
     MaskBits&=~SHIFTBIT; cw-JGqLx  
     break; ia.B@u1/  
    default: //judge the key and send message [&}<! :9'  
     break; ;%.k}R%O@  
   } |q b92|?  
   for(int index=0;index<MAX_KEY;index++){ ?|rw=%  
    if(hCallWnd[index]==NULL) .?)oiPW#  
     continue; <+JFal  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))  G/;aZ  
    { GM56xZ!2T  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ~=gH7V  
     bProcessed=TRUE; <T~fh>a  
    } RpXGgw  
   } 1UWgOCc  
  } EC\:uK  
  else if((lParam&0xc000ffff)==1){ //有键按下 gK_[3FiKt  
   switch(wParam) (dnc7KrM  
   { K]Cs2IpI  
    case VK_MENU: ;xC~{O  
     MaskBits|=ALTBIT; HQj4h]O#  
     break; JWjp<{Q; 1  
    case VK_CONTROL: :v ~q  
     MaskBits|=CTRLBIT; ~l(tl[  
     break; B9Tztg  
    case VK_SHIFT: BJ2W }R  
     MaskBits|=SHIFTBIT; oa|*-nw  
     break; ' "p*FN  
    default: //judge the key and send message |Dpfh  
     break; otVdx&%]  
   } 8pt<)Rs}  
   for(int index=0;index<MAX_KEY;index++){ Y-k~ 7{7  
    if(hCallWnd[index]==NULL) MM$" 6Jor  
     continue; 0s[3:bZ\Ia  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) qCT\rZU  
    { d(tf: @  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); \5c -L_  
     bProcessed=TRUE; dV*rnpN  
    } 3sIM7WD?  
   } jJC( (1|  
  } C8zeqS^N  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 $d[:4h~  
   for(int index=0;index<MAX_KEY;index++){ JJ06f~Iw[  
    if(hCallWnd[index]==NULL) A{"t0Ai='0  
     continue; 9 9BK/>R  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) q)y8Bv|  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); mV]g5>Q\  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 n 9M6wS  
   } \`5u@Nzx  
  } -%$ dFq  
 } OvG|=  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); wA&)y>n-  
} Y\S^DJy  
iFchD\E*o  
  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: '0rwNEg  
-{mq\GvGn  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Tz~ ftf  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); % E_{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: 6;V 1PK>9  
&h[}5  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) p[:%Ck"$7  
{ ^Pp FI  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) BVeNK=7m%  
 { }-iOYSn  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 kfECC&"  
  SaveBmp(); f_Bf}2Eedj  
  return FALSE; DMW:%h{  
 } (fb\A6  
 …… //其它处理及默认处理 h%e!f#  
} BBj"}~da  
C{^@.8:  
rJj~cPwL"  
  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。 z5w|+9U  
.q}k  
  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。 %W@IB8]Vr  
nmrk-#._@9  
  二、编程步骤 S3wH M  
9hpM*wt  
  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"; YJsi5  
T+!kRigN~P  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ?!-im*~w  
wB"Gw` D  
  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; $4,6&dwg  
 #0H[RU?  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; >Sah\u`  
63$m& ]x  
  5、 添加代码,编译运行程序。 essW,2,rjC  
~cwwB{  
三、程序代码 G"w Q(6J@  
mr.DP~O:9p  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL _"`h~jB  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) f d5~'2  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 6>J #M  
#if _MSC_VER > 1000 _gh7_P^H=d  
#pragma once z6(Q 3@iO  
#endif // _MSC_VER > 1000 F tjm@:X  
#ifndef __AFXWIN_H__ P2F>iK#U  
#error include 'stdafx.h' before including this file for PCH G$<0_0GF  
#endif i*j+<R@  
#include "resource.h" // main symbols `h6W@ROb  
class CHookApp : public CWinApp INpub 5  
{ " z{w^k  
 public: _r'M^=yx[  
  CHookApp(); N4-J !r@#~  
  // Overrides ,iUx'U  
  // ClassWizard generated virtual function overrides l0)uu4|  
  //{{AFX_VIRTUAL(CHookApp) #m>mYp8E.5  
 public: wYG0*!Vj  
  virtual BOOL InitInstance(); \>k+Oyj  
  virtual int ExitInstance(); 7 i/Cax  
  //}}AFX_VIRTUAL BZ9iy~  
  //{{AFX_MSG(CHookApp) "dTXT  
  // NOTE - the ClassWizard will add and remove member functions here. Q8i6kf!  
  // DO NOT EDIT what you see in these blocks of generated code ! {c; 3$  
  //}}AFX_MSG dW68lVWq_  
  DECLARE_MESSAGE_MAP() l-EQh*!j  
}; T(F8z5s5  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); =ndKG5  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); W^f#xrq>  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); TVA1FD  
BOOL InitHotkey(); X3yr6J[ ^  
BOOL UnInit(); gG>>ynn  
#endif AF6'JxG7  
L4b4X  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. g!ww;_  
#include "stdafx.h" Xg,BK0O  
#include "hook.h" ibyA~YUN/  
#include <windowsx.h> 4fswx@l  
#ifdef _DEBUG Pa<X^&  
#define new DEBUG_NEW lH.2H  
#undef THIS_FILE VWa(@ A  
static char THIS_FILE[] = __FILE__; Y{=@^4|]  
#endif /+msrrpD  
#define MAX_KEY 100 |e\%pfZ   
#define CTRLBIT 0x04 6Y^o8R  
#define ALTBIT 0x02 {J$aA6t:"T  
#define SHIFTBIT 0x01 $!Tw`O  
#pragma data_seg("shareddata") pJ[Q.QxU  
HHOOK hHook =NULL; J7xmf,76w  
UINT nHookCount =0; 9K!='u`  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey .2xkf@OP  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 2X_ef  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ZI7<E  
static int KeyCount =0; )RFeF!("  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Sqs`E[G*  
#pragma data_seg() _rd{cvdR  
HINSTANCE hins; -}@9lhS,  
void VerifyWindow(); xTT>3Fj  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) xFZq6si?  
//{{AFX_MSG_MAP(CHookApp) Rd)QVEk>SD  
// NOTE - the ClassWizard will add and remove mapping macros here. UZ#2*PH2E  
// DO NOT EDIT what you see in these blocks of generated code! d/1XL[&  
//}}AFX_MSG_MAP s9iM hCu|  
END_MESSAGE_MAP() S J5kA`  
 s25012  
CHookApp::CHookApp() SCij5il%  
{ 2B7&Ll\>  
 // TODO: add construction code here, )Yml'?V"  
 // Place all significant initialization in InitInstance e+wd>iiB  
} zu#o<6E{  
D 3PF(Wx  
CHookApp theApp; 0N.*c  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) jTnu! H2o  
{ /7^~*  
 BOOL bProcessed=FALSE; -bwl~3ZTi  
 if(HC_ACTION==nCode) OjZ@_V:  
 { uZ+<  
  if((lParam&0xc0000000)==0xc0000000){// Key up zlfm})+G  
   switch(wParam) PBmt.yF  
   { RulIzv  
    case VK_MENU: (yfTkBy  
     MaskBits&=~ALTBIT; \!r^6'A   
     break; c+JlM1p@  
    case VK_CONTROL: C7#$s<>TO  
     MaskBits&=~CTRLBIT; U,'n}]=4A3  
     break; ArY'NE\Htt  
    case VK_SHIFT: Z>l>@wNm  
     MaskBits&=~SHIFTBIT; 4rm/+Zes  
     break; cu-WY8n  
    default: //judge the key and send message ]G:xTv8  
     break; m| Z)h{&  
   } [C$ 0HW  
   for(int index=0;index<MAX_KEY;index++){ #_d%hr~d  
    if(hCallWnd[index]==NULL)  <CFu r  
     continue; $dR%8@.H  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) XebCl{HHp  
    { o0 Ae*Y0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); <  -Nj  
     bProcessed=TRUE; yFSL7`p+  
    } cnR>)9sX  
   } 5 F-Q&  
  } U:Y?2$#  
  else if((lParam&0xc000ffff)==1){ //Key down h>wU';5#f  
   switch(wParam) bm;4NA?Gg  
   { ]9' \<uR  
    case VK_MENU: rhrlEf@  
     MaskBits|=ALTBIT; ]Uu/1TTf  
     break; |fUSq1//  
    case VK_CONTROL: y{&,YV&_h  
     MaskBits|=CTRLBIT; nMhc3t  
     break; D)Zv  
    case VK_SHIFT: DCj!m<Y&  
     MaskBits|=SHIFTBIT; !>Xx</iD1  
     break; L|<Mtw  
    default: //judge the key and send message {'1,JwSmb  
     break; <6@Db$-  
   } $Ix^Rm9c  
   for(int index=0;index<MAX_KEY;index++) }^H_|;e1p  
   { *b&|  
    if(hCallWnd[index]==NULL) 7% h Mf$KQ  
     continue; sdb#K?l  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 7$'ja  
    { /vu7;xVG  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); _xJ&p$&  
     bProcessed=TRUE; wNlp4Z'[  
    } !Ej<J&e  
   } Rh=h{O  
  } {?8rvAj Y  
  if(!bProcessed){ i |t$sBIh  
   for(int index=0;index<MAX_KEY;index++){ q45n.A6a  
    if(hCallWnd[index]==NULL) z8o Sh t`+  
     continue; 344- ~i*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Px<;-H`  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); MStaP;|  
   } ek9%Xk8  
  } e.N#+  
 } ,q4Y N-3  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); D3]_AS&\  
} ?IK[]=!  
||hd(_W8  
BOOL InitHotkey() C-8@elZ1  
{ YJ6Xq||_  
 if(hHook!=NULL){ <*L8kNykK  
  nHookCount++; E:2Or~  
  return TRUE; NunT1ved  
 } [Mx+t3M  
 else p|zW2L  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); s^cHR1^  
  if(hHook!=NULL) [8ih-k  
   nHookCount++; ;yr 'K  
  return (hHook!=NULL); "zugnim  
} zQ6otDZx  
BOOL UnInit() %NvY~,  
{ E11"uWk`  
 if(nHookCount>1){ CGQ`i  
  nHookCount--; NOvN8.K%  
  return TRUE; k3&Wv  
 } \n}cx~j  
 BOOL unhooked = UnhookWindowsHookEx(hHook); K#>B'>A\  
 if(unhooked==TRUE){ gD-<^Q-  
  nHookCount=0; xu3qX"  
  hHook=NULL; >6c{CYuT  
 } #<{sP 0v*  
 return unhooked; cG.4%Va@s_  
} +BESO  
lyP<&<Y5  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) RJ`F2b sYN  
{ -0Ps. B  
 BOOL bAdded=FALSE; 0L'h5i>H)  
 for(int index=0;index<MAX_KEY;index++){ O[!]/qP+.  
  if(hCallWnd[index]==0){ 4g|}]K1s  
   hCallWnd[index]=hWnd; )gZ yW  
   HotKey[index]=cKey; WHL@]^E@m  
   HotKeyMask[index]=cMask; qTG/7tn "  
   bAdded=TRUE; \j4TDCs_[  
   KeyCount++; e7-U0rrE  
   break; OF}vY0oiw?  
  } z&w@67 >j  
 } %k9GoX_  
 return bAdded; BV|LRB}G  
} "lB[IB)  
o]@?QAu  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) LqNsQu";  
{ |(]XZ!{  
 BOOL bRemoved=FALSE; 5~v({R.  
 for(int index=0;index<MAX_KEY;index++){ l2i[wc"9  
  if(hCallWnd[index]==hWnd){ Pwf":U)  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ L+&$/1h]  
    hCallWnd[index]=NULL; ZjWI~"]  
    HotKey[index]=0; #}o*1  
    HotKeyMask[index]=0; WOh?/F[@u  
    bRemoved=TRUE; J%{>I   
    KeyCount--; /@:I\&{f'9  
    break; (m13 ong  
   } `j9 ;9^  
  } A2..gs/  
 } dj 4:r!5_  
 return bRemoved; 29:] cL(5  
} o!:   
umI@ej+D  
void VerifyWindow() y-9Mm9J  
{ 12.|Ed*72  
 for(int i=0;i<MAX_KEY;i++){ U`z=!KI+g  
  if(hCallWnd!=NULL){ n&Bgpt~  
   if(!IsWindow(hCallWnd)){ /C}u,dBf  
    hCallWnd=NULL; %AaZc=a[c  
    HotKey=0; EjrK.|I0  
    HotKeyMask=0;  _->d41  
    KeyCount--; 3v\}4)A[  
   } 0 *2^joUv  
  } ]v=A}}kS  
 } PY[nnoF"|  
} 0l;TZf=H  
P`^nNX]x+,  
BOOL CHookApp::InitInstance() kZ$2Uss  
{ ''tCtG" Xi  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); >4 VN1 ^  
 hins=AfxGetInstanceHandle(); ;X, A|m$(  
 InitHotkey(); 1aDx 6Mq  
 return CWinApp::InitInstance(); 4}`z^P<C  
} Qhy!:\&1  
DZ"'GQSg  
int CHookApp::ExitInstance() 7v't# =  
{ Q\rf J||  
 VerifyWindow(); _\;0E!=p  
 UnInit(); a]]eQ(xQ  
 return CWinApp::ExitInstance(); 3?5JY;}h>"  
} 6Z.Fyte  
%vUY|3G  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file tnE),  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) JV ydTvc  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Q`kV| pjg  
#if _MSC_VER > 1000 IK1'" S|  
#pragma once nvbzCtC  
#endif // _MSC_VER > 1000 jl9hFubwW  
TXdo,DPv7  
class CCaptureDlg : public CDialog {.eo?dQ  
{ {^8?fJ/L  
 // Construction w{mw?0  
 public: xu\s2x$  
  BOOL bTray; w$iQ,--  
  BOOL bRegistered; R#HVrzOO|T  
  BOOL RegisterHotkey(); ^p)#;$6b  
  UCHAR cKey; OY Sq)!:  
  UCHAR cMask; 'h R0JXy  
  void DeleteIcon(); GHY+q{'#V_  
  void AddIcon(); ZmI0|r}QbY  
  UINT nCount; f*}}Az.4  
  void SaveBmp(); DQ<4`wEM  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor nr&bpA/  
  // Dialog Data ijP `fM8  
  //{{AFX_DATA(CCaptureDlg) .exBU1Yk@  
  enum { IDD = IDD_CAPTURE_DIALOG }; uP G\1  
  CComboBox m_Key; >$,P )cB'  
  BOOL m_bControl; .dI".L  
  BOOL m_bAlt; #lR-?Uh  
  BOOL m_bShift; oz:"w nX  
  CString m_Path; ,oykOda:|  
  CString m_Number; |M`'   
  //}}AFX_DATA gFqF&t  
  // ClassWizard generated virtual function overrides #N"m[$;QR  
  //{{AFX_VIRTUAL(CCaptureDlg) E5!vw@,  
 public: A3)"+`&PUl  
  virtual BOOL PreTranslateMessage(MSG* pMsg); JkhWLQ>o  
 protected: LTxP@pr  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ^hXm=r4ozR  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); KRz~3yH{ c  
  //}}AFX_VIRTUAL wx^Det  
  // Implementation hC[ =e`j  
 protected: ]VL} eHZ  
  HICON m_hIcon; ?r 0rY?  
  // Generated message map functions `WIZY33V  
  //{{AFX_MSG(CCaptureDlg) , # =TputM  
  virtual BOOL OnInitDialog(); s_  t/  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); w"5Eyz-eO  
  afx_msg void OnPaint(); `;Ho<26  
  afx_msg HCURSOR OnQueryDragIcon(); yts@cd`$  
  virtual void OnCancel(); R2v9gz;W  
  afx_msg void OnAbout(); !( >U3N  
  afx_msg void OnBrowse(); 2xf #@`U  
  afx_msg void OnChange(); ? a#Gn2  
 //}}AFX_MSG _V 4O#;%?  
 DECLARE_MESSAGE_MAP() !KMl'kswe:  
}; <rtKPlb//  
#endif /{f"0]-RA  
Qo)Da}uo20  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file &Ts!#OcB,  
#include "stdafx.h" }4p)UX>aWT  
#include "Capture.h" Li]bU   
#include "CaptureDlg.h" b"WF]x|^  
#include <windowsx.h> b"uO BB  
#pragma comment(lib,"hook.lib") ckMG4 3i\j  
#ifdef _DEBUG \_WR:?l  
#define new DEBUG_NEW %cLS*=MO  
#undef THIS_FILE PChew3  
static char THIS_FILE[] = __FILE__; C7ug\_,s  
#endif $2\ 8Rn6'  
#define IDM_SHELL WM_USER+1 G<M0KU (  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); hs[x\:})/  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); -nXP<v=V  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; (P`=9+  
class CAboutDlg : public CDialog :h5G|^  
{ $m;`O_-T  
 public: b3EGtC}^  
  CAboutDlg(); 'y\Je7  
  // Dialog Data ?HJh;96B  
  //{{AFX_DATA(CAboutDlg) +l^tT&s;f  
  enum { IDD = IDD_ABOUTBOX }; 5CZyA`3V^5  
  //}}AFX_DATA ]Cj@",/3#  
  // ClassWizard generated virtual function overrides ;Ax-f04gG  
  //{{AFX_VIRTUAL(CAboutDlg) ?V,q&=9  
 protected: K fD. J)  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Ly&+m+Gwu  
  //}}AFX_VIRTUAL ?<${?L>  
  // Implementation )i}j\";>L  
 protected: )O"E#%  
  //{{AFX_MSG(CAboutDlg) Qn7T{ BW  
  //}}AFX_MSG '{cSWa| #  
  DECLARE_MESSAGE_MAP() Rjq Xz6  
}; ._^}M<o L  
0W(mx-[H/  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)  ][wb4$2  
{ ]R_R`X?  
 //{{AFX_DATA_INIT(CAboutDlg) n9xP8<w8  
 //}}AFX_DATA_INIT ])wdd>'  
} @>HTbs6W  
i+h*<){X  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) iI{L>  
{ <a]i"s  
 CDialog::DoDataExchange(pDX); TY)QE  
 //{{AFX_DATA_MAP(CAboutDlg) i}VF$XN  
 //}}AFX_DATA_MAP SK lvZ  
} jd](m:eG  
\= v.$u"c  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Hl,{4%]  
 //{{AFX_MSG_MAP(CAboutDlg) >=[uLY[aK  
 // No message handlers eJ99W=  
 //}}AFX_MSG_MAP Up{[baWF  
END_MESSAGE_MAP() .Q%Hi7JMi  
,c4HicRJ#  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ~f h  
: CDialog(CCaptureDlg::IDD, pParent) 4p,:}h  
{ y6nP=g|')>  
 //{{AFX_DATA_INIT(CCaptureDlg) 0n{.96r0R  
  m_bControl = FALSE; RNi%6A1  
  m_bAlt = FALSE; \IE![=p\w  
  m_bShift = FALSE; HohCb4do  
  m_Path = _T("c:\\"); !HvA5'|:}  
  m_Number = _T("0 picture captured."); pR$(V4>  
  nCount=0; D`T;j[SsS#  
  bRegistered=FALSE;  !BsQJ_H  
  bTray=FALSE; ~Jk& !IE2  
 //}}AFX_DATA_INIT P9/ (f$=  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ^+SE_-+]  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 7q+D}+ Xf  
} 1(gs({  
T&lgWOls  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) TI'v /=;)  
{ =vbG'_[7  
 CDialog::DoDataExchange(pDX); 053bM)qW  
 //{{AFX_DATA_MAP(CCaptureDlg) uZC=]Ieh  
  DDX_Control(pDX, IDC_KEY, m_Key); YIg(^>sq  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); XVqOiv)  
  DDX_Check(pDX, IDC_ALT, m_bAlt); :~otzI4%!  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); @|\9<S  
  DDX_Text(pDX, IDC_PATH, m_Path); CIx(SeEF  
  DDX_Text(pDX, IDC_NUMBER, m_Number); {Rkd;`Q`!  
 //}}AFX_DATA_MAP iApq!u,  
} & Q3Fgj  
,AP0*Ln  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) eX+36VG\  
//{{AFX_MSG_MAP(CCaptureDlg) w*-42r3,'  
 ON_WM_SYSCOMMAND() U?UU] >Q  
 ON_WM_PAINT() oX|T&"&  
 ON_WM_QUERYDRAGICON() e9o\qEm   
 ON_BN_CLICKED(ID_ABOUT, OnAbout) xqt?z n  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) $fmTa02q>  
 ON_BN_CLICKED(ID_CHANGE, OnChange) `,qft[1  
//}}AFX_MSG_MAP (QDKw}O2b  
END_MESSAGE_MAP() !;eE7xn&  
ZwkUd-=0i  
BOOL CCaptureDlg::OnInitDialog() Cz0FA]-g  
{ Ix-Mp   
 CDialog::OnInitDialog(); J8 qFdNK  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); XwY,xg&o  
 ASSERT(IDM_ABOUTBOX < 0xF000); jr=9.=jI8k  
 CMenu* pSysMenu = GetSystemMenu(FALSE); &DLWlMGq  
 if (pSysMenu != NULL) dHy9 wU  
 { aKDY_ D  
  CString strAboutMenu; B*T n@t W  
  strAboutMenu.LoadString(IDS_ABOUTBOX); )[ V8YiyU  
  if (!strAboutMenu.IsEmpty()) F w 0m(7  
  { 50cVS)hG6d  
   pSysMenu->AppendMenu(MF_SEPARATOR); '^UHY[mX8  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); .d<K`.O ;  
  } tF:AnNp=  
 } o-\h;aQJ  
 SetIcon(m_hIcon, TRUE); // Set big icon ^%r6+ey  
 SetIcon(m_hIcon, FALSE); // Set small icon J$#T_4 )  
 m_Key.SetCurSel(0); &t= :xVn-M  
 RegisterHotkey(); \ %Mcvb.?  
 CMenu* pMenu=GetSystemMenu(FALSE); 8!E.3'jb  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); |V a:*3u  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 'Aq^z%|  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); P([!psgu  
 return TRUE; // return TRUE unless you set the focus to a control 5#GMp  
} kelBqJ-,p  
Tqt-zX|>  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) "w:h  
{ BJjic%V  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ,"EaZ/Bl/  
 { 2lTt  
  CAboutDlg dlgAbout; NM{)liP ;8  
  dlgAbout.DoModal(); _4by3?<c  
 } J :O!4gI  
 else cYA:k  
 { e$[O J<t  
  CDialog::OnSysCommand(nID, lParam); B4y_{V  
 } Fi i(dmn  
} wW%b~JX  
$|~ <6A{y  
void CCaptureDlg::OnPaint() uj8saNu  
{ 287j,'vR  
 if (IsIconic()) QTHY{:Rmu  
 { t\M6 d6  
  CPaintDC dc(this); // device context for painting eC-&.Fl  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Z>g72I%X  
  // Center icon in client rectangle "V[j&B)P  
  int cxIcon = GetSystemMetrics(SM_CXICON); w!m4>w  
  int cyIcon = GetSystemMetrics(SM_CYICON); 4|?(LHBD)  
  CRect rect; 1aAOT6h  
  GetClientRect(&rect); Qc7*p]E&  
  int x = (rect.Width() - cxIcon + 1) / 2; [+\He/M6  
  int y = (rect.Height() - cyIcon + 1) / 2; 2j-l<!s  
  // Draw the icon A%^?z.  
  dc.DrawIcon(x, y, m_hIcon); ctP+ECH  
 } n9Fq^^?  
 else k-~}KlP  
 { f Fi=/}  
  CDialog::OnPaint(); Xh8U}w<k6  
 } SoziFI  
} G<CD 4:V  
#:?:gY<  
HCURSOR CCaptureDlg::OnQueryDragIcon() BZ?w}%-MO  
{ .#&)%}GC  
 return (HCURSOR) m_hIcon; tj;47UtH  
} y4kn2Mw;  
7J);{ &x9h  
void CCaptureDlg::OnCancel() bW`nLiw}%  
{ wq?"NQ?O<  
 if(bTray) v?He]e'  
  DeleteIcon(); jkk%zu  
  CDialog::OnCancel(); I#OZ:g^  
} 2hHRitt36  
I bD u+~)  
void CCaptureDlg::OnAbout() tR!C8:u  
{ |>ztx}\  
 CAboutDlg dlg; /we]i1-9  
 dlg.DoModal(); q]4h#?.-1v  
} =X'[r  
~i1 jh:,  
void CCaptureDlg::OnBrowse() #ft9ms#N  
{ Qb {[xmc  
 CString str; G8}owszT  
 BROWSEINFO bi; w[GEm,ZC  
 char name[MAX_PATH]; Zq 4%O7%  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); AWcbbj6Nd  
 bi.hwndOwner=GetSafeHwnd(); #x.v)S  
 bi.pszDisplayName=name; 6.]~7n  
 bi.lpszTitle="Select folder"; H'i\N?VL  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 9wx]xg4l"  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); AJ\gDjj<  
 if(idl==NULL) Y2VfJ}%Q  
  return; &$XTe2  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ? l~qb]._  
 str.ReleaseBuffer(); 2D:/.9= 8v  
 m_Path=str; ]aIHd]B  
 if(str.GetAt(str.GetLength()-1)!='\\') +&\. ]Pp  
  m_Path+="\\"; N_92,xI#  
 UpdateData(FALSE); {`):X_$T  
} yV`Tw"p  
GJdL1ptc  
void CCaptureDlg::SaveBmp() XVN JK-B  
{ 3/gR}\=  
 CDC dc; +X#6 d v$  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); m ^FKE:  
 CBitmap bm; <oXBkCi0r  
 int Width=GetSystemMetrics(SM_CXSCREEN); 3[Q7'\  
 int Height=GetSystemMetrics(SM_CYSCREEN); E,d<F{=8,o  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 29=ob("  
 CDC tdc; s/ABT.ZO  
 tdc.CreateCompatibleDC(&dc); 8Y-*rpLy  
 CBitmap*pOld=tdc.SelectObject(&bm); +tk`$g  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 6D ]fDeH\  
 tdc.SelectObject(pOld); 4M%|N  
 BITMAP btm; /,S VG1  
 bm.GetBitmap(&btm); qUfoEpW2=6  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; j3&q?1  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); "$N$:B@U  
 BITMAPINFOHEADER bih; jOCV)V9}  
 bih.biBitCount=btm.bmBitsPixel; - "zW"v)\  
 bih.biClrImportant=0; ;'Hu75ymo  
 bih.biClrUsed=0; 8GBKFNR 8  
 bih.biCompression=0; E q4tcZ  
 bih.biHeight=btm.bmHeight; #6a!OQj  
 bih.biPlanes=1; l[~$9C'ji  
 bih.biSize=sizeof(BITMAPINFOHEADER); @|cHDltH  
 bih.biSizeImage=size; E-1u_7  
 bih.biWidth=btm.bmWidth; |*48J1:1y  
 bih.biXPelsPerMeter=0; *04}84?:  
 bih.biYPelsPerMeter=0; ekY)?$v3  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 6*B%3\z)  
 static int filecount=0; xq.kH|bH  
 CString name; 5`3 x(=b  
 name.Format("pict%04d.bmp",filecount++); ,8zJD&HMx  
 name=m_Path+name; i%!<9D~n  
 BITMAPFILEHEADER bfh; [ PN2^  
 bfh.bfReserved1=bfh.bfReserved2=0; eV%{XR?y  
 bfh.bfType=((WORD)('M'<< 8)|'B'); rI\5djiYJ  
 bfh.bfSize=54+size; z#Qe$`4&  
 bfh.bfOffBits=54; |(l]Xr&O  
 CFile bf; r<kgYU`  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ *A`ZcO=   
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); lV:feX  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); !e<5JO;c  
  bf.WriteHuge(lpData,size); v6G1y[Wl  
  bf.Close(); W;8A{3q%N0  
  nCount++; 8 a)4>B  
 } 9_==C"F  
 GlobalFreePtr(lpData); 1?w=v|b:P)  
 if(nCount==1) !4<D^ eh  
  m_Number.Format("%d picture captured.",nCount); b5MU$}:  
 else YFu>`w^Y  
  m_Number.Format("%d pictures captured.",nCount); 3f$n8>mq  
  UpdateData(FALSE); T*@o?U  
} y=pW+$k  
MB:[: nX  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) \^0>h`[  
{ (xvg.Nby  
 if(pMsg -> message == WM_KEYDOWN) EZ>(}  
 { 0t7)x8c  
  if(pMsg -> wParam == VK_ESCAPE) N"<.v6Z  
   return TRUE; E,\)tZ;,  
  if(pMsg -> wParam == VK_RETURN) Id^q!4Th9  
   return TRUE; DZmVm['l  
 } x0)=jp '  
 return CDialog::PreTranslateMessage(pMsg); OYxYlUq  
} Jw=7eay$F  
x]`F#5j  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) R|}4H*N  
{ ez9F!1  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ @"h4S*U  
  SaveBmp(); I@z@s}x>  
  return FALSE; prt(xr4@  
} qi~-<qW  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ [(g2u@  
 CMenu pop; 2.</n}g  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); zOA~<fhT  
 CMenu*pMenu=pop.GetSubMenu(0); J~J+CGT~2  
 pMenu->SetDefaultItem(ID_EXITICON); P<Z` 8a[  
 CPoint pt; &ZMQ]'&  
 GetCursorPos(&pt); |wJdp,q R  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 1P"{TMd?  
 if(id==ID_EXITICON) QKEtV  
  DeleteIcon(); T^MY w  
 else if(id==ID_EXIT) wbOYtN Y@  
  OnCancel(); !w UznyYwt  
 return FALSE; '/XP4B\(E  
} q2F `q. j  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Lp"OXJ*es  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) IO&U=-pn&  
 AddIcon(); 9i 9 ,X^=  
 return res; %'g)MK!e  
} %Iflf]l  
l'Za"TL:  
void CCaptureDlg::AddIcon() jmgkY)rb R  
{ )c*xKij  
 NOTIFYICONDATA data; qT$IV\;_  
 data.cbSize=sizeof(NOTIFYICONDATA); GK-P6d  
 CString tip; hC8WRxEGq  
 tip.LoadString(IDS_ICONTIP); 8a@k6OZ  
 data.hIcon=GetIcon(0); OY(CB(2N  
 data.hWnd=GetSafeHwnd(); q9_AL8_  
 strcpy(data.szTip,tip); y5=,q]Qjk[  
 data.uCallbackMessage=IDM_SHELL; 6/3E!8  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; &+(D< U  
 data.uID=98; %{IgY{X  
 Shell_NotifyIcon(NIM_ADD,&data); -1B.A  
 ShowWindow(SW_HIDE); 6ERMn"[_w  
 bTray=TRUE; #wT6IU1  
} x&J\swN9  
&QD)1b[U  
void CCaptureDlg::DeleteIcon() Z~h6^h   
{ 2!}F+^8'P  
 NOTIFYICONDATA data; 3 eF c  
 data.cbSize=sizeof(NOTIFYICONDATA); @=AQr4&  
 data.hWnd=GetSafeHwnd(); fQ1j@{Xa  
 data.uID=98; :4 z\Q]  
 Shell_NotifyIcon(NIM_DELETE,&data); !^y;|9?O  
 ShowWindow(SW_SHOW); -3? <Ja  
 SetForegroundWindow(); (x/:j*`K  
 ShowWindow(SW_SHOWNORMAL); zd8A8]&-  
 bTray=FALSE; p{_*<"cfYn  
} |S).,B  
XZ8rM4 ]  
void CCaptureDlg::OnChange() U!Zj%H1XQ0  
{ B*}]'  
 RegisterHotkey(); VHqoa>U,*  
} l=T;hk  
|.RyF@N`T  
BOOL CCaptureDlg::RegisterHotkey() Q1|6;4L  
{  *p9)5  
 UpdateData(); B_[I/ ?  
 UCHAR mask=0; $ S3b<]B  
 UCHAR key=0; A p?,y?  
 if(m_bControl) JAjiG^]  
  mask|=4; _IOUhMo  
 if(m_bAlt) 3^&`E} r  
  mask|=2; k ?6d\Q  
 if(m_bShift) ~vpF|4Zn5  
  mask|=1; QPLWRZu@  
  key=Key_Table[m_Key.GetCurSel()]; H[s+.&^  
 if(bRegistered){ T ?[;ej:  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); vOCaru?~h  
  bRegistered=FALSE; mX.mX70|J  
 } Xl2g Hh  
 cMask=mask; 3'6 UvAXFH  
 cKey=key; w[l#0ZZ  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); rxMo7px@}I  
 return bRegistered; =$bF[3D  
} w+j\Py_G"  
2.Ww(`swL  
  四、小结 <G<5)$ S  
uSI@Cjp  
  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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