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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: `~\SQ EY$  
  o.Ww .F  
  一、实现方法 rZ,3:x-:  
Uy=yA  
  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: >7@,,~3  
#SHJ0+)o  
#pragma data_seg("shareddata") ta.Lq8/  
HHOOK hHook =NULL; //钩子句柄 KiG19R$  
UINT nHookCount =0; //挂接的程序数目 3_G0eIE"u  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 i<m) s$u  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 dSjO 12b  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey t0cS.hi  
static int KeyCount =0; sh,4n{+  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 'r=2f6G>cP  
#pragma data_seg() W8`6O2  
6{d?3Jk  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 >4bw4 Z1  
X`<z5W] !  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 7 `~0j6FY  
_ LgP  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR |5>A^a  
cKey,UCHAR cMask) O*+HK1q7  
{ A%EhRAy  
 BOOL bAdded=FALSE; 5G6 Pp7[  
 for(int index=0;index<MAX_KEY;index++){ +EA ")T<l  
  if(hCallWnd[index]==0){ F%zMhX'AG  
   hCallWnd[index]=hWnd; [,st: Y  
   HotKey[index]=cKey; _GY2|x2c  
   HotKeyMask[index]=cMask; 3R$R?^G  
   bAdded=TRUE; s8:epcL`A  
   KeyCount++; pno}`Cer  
   break; ]~$@x=p2e  
  } 1 39T*0C  
 } k]gPMhe  
 return bAdded; p".wqg*W  
} q%k&O9C2]  
//删除热键 ;*K;)C  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) XU<owk  
{ C&@'oLr  
 BOOL bRemoved=FALSE; {88|J'*L  
 for(int index=0;index<MAX_KEY;index++){ D',7T=C   
  if(hCallWnd[index]==hWnd){  e4_A`j'  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ IW@xT@  
    hCallWnd[index]=NULL; *:\[;69[  
    HotKey[index]=0; 8S#&XS>o  
    HotKeyMask[index]=0; iiuT:r  
    bRemoved=TRUE; sBWyUD  
    KeyCount--; {8":c n j  
    break; .mwW`D  
   } w&#[g9G%  
  } d8 ~%(I9  
 } r9-ayp#pC  
 return bRemoved;  0zr%8Q(Q  
} 8T+o.w==  
AzzHpfv,  
Xa-TNnws?  
  DLL中的钩子函数如下: u1kCvi#N  
*Q2 oc:6  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) |$\1E+  
{ ?$I9/r  
 BOOL bProcessed=FALSE; 4TQmEM,  
 if(HC_ACTION==nCode) Dg~m}La  
 { Q<szH1-  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 AD!w:jT9  
   switch(wParam) f"\klfrRI_  
   {  xIc||o$  
    case VK_MENU: DHjfd+E=s  
     MaskBits&=~ALTBIT; FW2x  
     break; ( !m6>m2  
    case VK_CONTROL: :SwA) (1  
     MaskBits&=~CTRLBIT; H #X*OJ  
     break; v:!TqfI  
    case VK_SHIFT: !:xE X~  
     MaskBits&=~SHIFTBIT; ":sp0(`h  
     break; AW_YlS  
    default: //judge the key and send message z<P?p  
     break; OP=oSfa  
   } TXd6o=  
   for(int index=0;index<MAX_KEY;index++){ V_^pPBa  
    if(hCallWnd[index]==NULL) rkh%[o 9"/  
     continue; .`u8(S+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Bk~lM'  
    { ZJFF4($qN  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); >^W6'Q$P<  
     bProcessed=TRUE; vEG7A$Z"  
    } fGH)Fgo`  
   } #u"@q< )  
  } s7jNRY V  
  else if((lParam&0xc000ffff)==1){ //有键按下 fhdqes])  
   switch(wParam) fwx^?/5j  
   { %#EzZD  
    case VK_MENU: [# X} (  
     MaskBits|=ALTBIT; E>E^t=; [  
     break; it>Bf;  
    case VK_CONTROL: y% !.:7Y  
     MaskBits|=CTRLBIT; qxyY2&  
     break; 3z#> 1HD$  
    case VK_SHIFT: e&A3=a~\s  
     MaskBits|=SHIFTBIT; -=lL{oB1  
     break; Pec40g:#F  
    default: //judge the key and send message 3ohHBo  
     break; N*PJ m6-  
   } 3,!IV"_  
   for(int index=0;index<MAX_KEY;index++){ vN]_/T+  
    if(hCallWnd[index]==NULL) R:'&>.AUw  
     continue; ,\\=f#c=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) < )_#6)z:  
    { @yQ1F> t  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); xU{0rM"  
     bProcessed=TRUE; dB&<P[$+8  
    } 2A*,9S|Y  
   } 4QPHT#eqX  
  } -W/D Cj<  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 3*{l^<`:gA  
   for(int index=0;index<MAX_KEY;index++){ kE+fdr\ T  
    if(hCallWnd[index]==NULL) @^# 9N!Fj]  
     continue; DHhty qm  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ^?q(fK%  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 9J_vvq`%`  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 TR `C|TV>  
   } Zu~t )W  
  } 2h}FotlO  
 } a~!7A ZT-O  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Mu.oqT  
} xudZ7   
.'l3NV^{  
  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: o8A8fHl  
wvxqgXnB\  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); -IDhK}C&T  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); B 'O1dRj&6  
0>;[EFL  
  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: 7)>L#(N  
?!c7Zx,(  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) MCXt,`}[  
{ $QT% -9&  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) E+ XR[p  
 { %3=T7j  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 u ^2/:L  
  SaveBmp(); D4@(_6^  
  return FALSE; Du-Q~I6  
 } \|4F?Y  
 …… //其它处理及默认处理 p2O[r  
} >h9~ /  
ljg6uz1v %  
d;3f80Kd*  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 ^"uD:f)  
n"~K",~P  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 l r~>!O  
8@6*d.+e  
  二、编程步骤 u2':~h?l  
c*(=Glzn  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; V6Of(;r  
!0Ak)Q]e'  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; a_DK"8I  
hsK(09:J  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; ZXbq5p_  
b+dmJ]c  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; q}E'x/s2m  
h9nh9a(2  
  5、 添加代码,编译运行程序。 IG%x(\V-e  
O!F"w !5@  
三、程序代码 FELW?Q?k  
,&@FToR  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL h,/3 }  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) a94 nB  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ep l1xfr  
#if _MSC_VER > 1000 20A:,pMb  
#pragma once S4E@wLi  
#endif // _MSC_VER > 1000 (f* r  
#ifndef __AFXWIN_H__ Vrp]YR L`  
#error include 'stdafx.h' before including this file for PCH 7 lq$PsC  
#endif J|z' <W  
#include "resource.h" // main symbols ?Qpi(Czbpq  
class CHookApp : public CWinApp JmBMc }54  
{ CWD $\K G  
 public: #TgP:t]p  
  CHookApp(); +\vN#xDz  
  // Overrides cvpZF5mL]U  
  // ClassWizard generated virtual function overrides Sx_j`Cgy  
  //{{AFX_VIRTUAL(CHookApp) &k(tDP  
 public:  |>Pv2  
  virtual BOOL InitInstance(); IJ{VCzi  
  virtual int ExitInstance(); *@YQr]~ ;  
  //}}AFX_VIRTUAL \x_$Pu  
  //{{AFX_MSG(CHookApp) {PL,3EBG  
  // NOTE - the ClassWizard will add and remove member functions here. y}W*P#BDO  
  // DO NOT EDIT what you see in these blocks of generated code ! B]>rcjD  
  //}}AFX_MSG Xs2B:`,hh  
  DECLARE_MESSAGE_MAP() k$,y1hH;f8  
}; :mdoGb$ dr  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); V* ,u;*  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); EYZ,GT-I  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); \qJ^n %  
BOOL InitHotkey(); &';@CeK  
BOOL UnInit(); ^w*vux|F  
#endif 8nSw7:z  
UwDoueXs  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. `ih#>i_ &  
#include "stdafx.h" '?E@H.""  
#include "hook.h" A.!3{pAb  
#include <windowsx.h> ?Xp+5{  
#ifdef _DEBUG NL"w#kTc()  
#define new DEBUG_NEW ;tZ8Sh)  
#undef THIS_FILE gg Hl{cl)  
static char THIS_FILE[] = __FILE__; 6U] "i  
#endif J=#9eW  
#define MAX_KEY 100 ^$8WV&5q>  
#define CTRLBIT 0x04 HDhG1B"NL  
#define ALTBIT 0x02 EOGz;:b&  
#define SHIFTBIT 0x01 +C4NhA2  
#pragma data_seg("shareddata") iz`ys.Fu  
HHOOK hHook =NULL; Lo9 \[4FP  
UINT nHookCount =0; j2#B l  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey bWB&8&p  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 7{[i)  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey .R@euIva  
static int KeyCount =0; 3TKl  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ~HBx5Cpi  
#pragma data_seg() %bhFl,tL  
HINSTANCE hins; >>>MTV f  
void VerifyWindow(); &Qv%~dvW  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) sDy~<$l?  
//{{AFX_MSG_MAP(CHookApp) cdfnM%`>\  
// NOTE - the ClassWizard will add and remove mapping macros here. MIc(B_q  
// DO NOT EDIT what you see in these blocks of generated code! zOL*XZ0c  
//}}AFX_MSG_MAP 8w3Wy<}y  
END_MESSAGE_MAP() TyaK_XW  
j<vU[J+gx~  
CHookApp::CHookApp() 5=.mg6:  
{ 3^F1hCB  
 // TODO: add construction code here, H4e2#]*i7  
 // Place all significant initialization in InitInstance p"NuR4   
} ;BEX|w xn  
/<IXCM.  
CHookApp theApp; Mwd.S  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) l @r`NFWD@  
{ RgVg~?A@  
 BOOL bProcessed=FALSE; rGSi !q  
 if(HC_ACTION==nCode) #Xun>0  
 { !p 70g0+  
  if((lParam&0xc0000000)==0xc0000000){// Key up A) TO<dl  
   switch(wParam) }ev+WIERQV  
   { ]8XIw`:f  
    case VK_MENU: zS}!87r)  
     MaskBits&=~ALTBIT; aDX4}`u  
     break; Qlhm:[  
    case VK_CONTROL: "(E%JAwZ^W  
     MaskBits&=~CTRLBIT; 2!Pwg0%2  
     break; 2{)<Df@  
    case VK_SHIFT: 3WY:Fn+#  
     MaskBits&=~SHIFTBIT; R #m1Aa  
     break; z%/<|`  7  
    default: //judge the key and send message Dl=vv9  
     break; yc@ :*Z  
   } bKPjxN?!9  
   for(int index=0;index<MAX_KEY;index++){ ?*U:=|  
    if(hCallWnd[index]==NULL) rj;~SC{  
     continue; boIFN;Aq"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) q%Lw#f  
    { ch0x*[N@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ~ZRtNL9   
     bProcessed=TRUE; N|s8PIcSp  
    } x@<!#d+  
   } N_y#Y{c{(  
  } (7}Zh|@W  
  else if((lParam&0xc000ffff)==1){ //Key down `qr.@0whP  
   switch(wParam) vb k4  
   { :j% B(@b  
    case VK_MENU: g+u5u\k  
     MaskBits|=ALTBIT; KU;m.{  
     break; M0uC0\' #P  
    case VK_CONTROL: ~RnBs`&!  
     MaskBits|=CTRLBIT; qnU$Pd  
     break; lKy4Nry9  
    case VK_SHIFT: 1?#Wg>7'  
     MaskBits|=SHIFTBIT; c}#(,<8X  
     break; @-}!o&G0  
    default: //judge the key and send message ny+_&l^R~(  
     break; q3Y49d  
   } H AMps[D[  
   for(int index=0;index<MAX_KEY;index++) uGS^*W$  
   { ~bX ) %jC  
    if(hCallWnd[index]==NULL) ;?!pcvUi  
     continue; vjXCArS  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) C<iOa)_@Q  
    { { :_qa|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); C~VyM1inD  
     bProcessed=TRUE; W:=CpbwENX  
    } ZY> u4v.  
   } [$%0[;jtS  
  }  2dBjc{  
  if(!bProcessed){ )N]%cO(^  
   for(int index=0;index<MAX_KEY;index++){ 0Ewt >~n  
    if(hCallWnd[index]==NULL) [ r=U-  
     continue; |#(g 8ua7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) L~L]MC&  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); y O?52YO  
   } Zq"wq[GCN  
  } bR|1* <  
 } <fcw:Ae  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); xT3l>9i  
} kX]p;C  
7#iT33(3  
BOOL InitHotkey() 8]0?mV8iOE  
{ eq Wb>$  
 if(hHook!=NULL){ @NJJ  
  nHookCount++; ` oXL  
  return TRUE; jh.e&6  
 } >oc&hT  
 else v`u>; S_  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); %Z6\W; (n  
  if(hHook!=NULL) Zl`sY5{1  
   nHookCount++; jT q@@y  
  return (hHook!=NULL); Jl^THoEL  
} JB\BP$ap  
BOOL UnInit() rwep e5  
{ FuZLE%gP  
 if(nHookCount>1){ ( 0Z3Ksfj1  
  nHookCount--; G@]|/kN1y  
  return TRUE; O(f&0h !  
 } }=^Al;W  
 BOOL unhooked = UnhookWindowsHookEx(hHook); {:d9q  
 if(unhooked==TRUE){ 1'g{tP"d  
  nHookCount=0; AA0zt N  
  hHook=NULL; h\$juIQa  
 } 9]TvL h3  
 return unhooked;  al:c2o  
} Q\<^ih51  
}x}JzA+2  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) AehkEN&H/t  
{ @](\cT64i3  
 BOOL bAdded=FALSE; 'P?DZE  
 for(int index=0;index<MAX_KEY;index++){ fTc ,"{  
  if(hCallWnd[index]==0){ 7Ke#sW.HN  
   hCallWnd[index]=hWnd; Ty>g:#bogI  
   HotKey[index]=cKey; V{G9E  
   HotKeyMask[index]=cMask; 4 jeUYkJUM  
   bAdded=TRUE; Pxm~2PAm  
   KeyCount++; o+Kh2;$)  
   break; ;P4tqY@  
  } ym)`<[T  
 } )IP{yL8c  
 return bAdded; Sk,9<@  
} 8q& *tpE  
C]+T5W\"<B  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) yD9<-B<)  
{ P&@[ j0  
 BOOL bRemoved=FALSE; A?sU[b6_  
 for(int index=0;index<MAX_KEY;index++){ PNMf5'@m  
  if(hCallWnd[index]==hWnd){ x2g P, p-  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Yl6\}_h`  
    hCallWnd[index]=NULL; ~_Mz05J-\_  
    HotKey[index]=0; :-kXZe  
    HotKeyMask[index]=0; IW'2+EGc  
    bRemoved=TRUE; juuV3et  
    KeyCount--; iy_\1jB0  
    break; zx{O/v KG  
   } r'ydjy  
  } 5=.EngG  
 } q#~]Hp=W5  
 return bRemoved; |.Pl[y  
} 'qg q8  
mjqVP.  
void VerifyWindow() !zNMU$p  
{ C=/nZGG  
 for(int i=0;i<MAX_KEY;i++){ #TX=%x6  
  if(hCallWnd!=NULL){ |O]oX[~  
   if(!IsWindow(hCallWnd)){ K9y!ZoB  
    hCallWnd=NULL; nC5  
    HotKey=0; :J}@*>c  
    HotKeyMask=0; 8HLcDS#  
    KeyCount--; 7E9h!<5v  
   } .1F^=C.w  
  } H19CVc\B  
 } k98}Jx7J)"  
} L){rv)?="  
_8'FI_E3  
BOOL CHookApp::InitInstance() k&1~yW  
{ '.wyfSH@  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); g{ cHh(S  
 hins=AfxGetInstanceHandle(); cKX6pG  
 InitHotkey(); 1Bz'$u;  
 return CWinApp::InitInstance(); FT* o;&_QS  
} jbqhNsTNK  
^Q?I8,4}  
int CHookApp::ExitInstance() !Ax7k;T  
{ +0O{"XM  
 VerifyWindow(); h,V#V1>Hu  
 UnInit(); Cu\A[6g,  
 return CWinApp::ExitInstance(); o?J>mpC  
} ZC1U  
iM Xl}3  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file nV0"q|0K;  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ;Db89Nc$  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 1& k_&o  
#if _MSC_VER > 1000 -hP@L ++D  
#pragma once khb Gyg%  
#endif // _MSC_VER > 1000 %L./U$  
]AGJPuX  
class CCaptureDlg : public CDialog N+?kFob  
{ N3nk\)V\E  
 // Construction R?Q@)POW  
 public: WQ]~TGW  
  BOOL bTray; 9k^;]jE  
  BOOL bRegistered; K`@GN T&  
  BOOL RegisterHotkey(); eb)S<%R/  
  UCHAR cKey; `C`_2y8  
  UCHAR cMask; h<9h2  
  void DeleteIcon(); h(I~HZ[K&T  
  void AddIcon(); d+|8({X]D8  
  UINT nCount; 3X{=* wvt  
  void SaveBmp(); MQQ!@I`  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor id.o )=  
  // Dialog Data O329Bkg  
  //{{AFX_DATA(CCaptureDlg) @Ey(0BxNu  
  enum { IDD = IDD_CAPTURE_DIALOG }; MWCP/~>a2  
  CComboBox m_Key; C<6IiF[>%  
  BOOL m_bControl; 3Nh;^  
  BOOL m_bAlt; 0rT-8iJp4P  
  BOOL m_bShift; flLC\   
  CString m_Path; E YUr.#:  
  CString m_Number; #TUsi,jG  
  //}}AFX_DATA ~ S R:,R  
  // ClassWizard generated virtual function overrides }@Oy kN  
  //{{AFX_VIRTUAL(CCaptureDlg) H+; _fd  
 public: sf?D4UdIH  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ;1cX|N=  
 protected: `ge{KB;*n#  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support r! 5C3  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); CD^_>sya  
  //}}AFX_VIRTUAL _SC>EP8:Z  
  // Implementation R$*{@U  
 protected: QH4nb h4  
  HICON m_hIcon; )E^4\3 ^:  
  // Generated message map functions Ckvm3r\i2  
  //{{AFX_MSG(CCaptureDlg) &K`[SX=  
  virtual BOOL OnInitDialog(); $xS `i-|  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ;G~0 VM2|  
  afx_msg void OnPaint(); 9h$-:y3  
  afx_msg HCURSOR OnQueryDragIcon(); o"v> BhpC  
  virtual void OnCancel(); SM:{o&S`  
  afx_msg void OnAbout(); D;<Q m,[  
  afx_msg void OnBrowse(); _qmB PUx  
  afx_msg void OnChange(); ~]A';xH&  
 //}}AFX_MSG 2u6N';jgZ  
 DECLARE_MESSAGE_MAP() DnaG$a<  
}; / v;g v[  
#endif C did*hxJ  
o)?"P;UhJX  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file q[q#cY:0  
#include "stdafx.h" |n=kYs  
#include "Capture.h" ,_Fq*6  
#include "CaptureDlg.h" i[^?24~ c  
#include <windowsx.h> Vk$zA<sw"  
#pragma comment(lib,"hook.lib") N:clwmo  
#ifdef _DEBUG [ WZ<d^L  
#define new DEBUG_NEW G_[|N>  
#undef THIS_FILE *Yvfp{B  
static char THIS_FILE[] = __FILE__; $Kb-mFR  
#endif FWdSpaas Q  
#define IDM_SHELL WM_USER+1 >9=Y(`  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); _hMVv&$  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); H U$:x"AW  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; t_,iV9NrZ  
class CAboutDlg : public CDialog *`);_EVc  
{ t3Q;1#Zf  
 public: 9))%tYN  
  CAboutDlg(); !hF b <  
  // Dialog Data rP;Fh|w#  
  //{{AFX_DATA(CAboutDlg) *H&a_s/{Nb  
  enum { IDD = IDD_ABOUTBOX }; Y.i<7pBt  
  //}}AFX_DATA KE16BjX@  
  // ClassWizard generated virtual function overrides ; ZL<7tLDb  
  //{{AFX_VIRTUAL(CAboutDlg) =}r&>|rrJ  
 protected: %o#D"  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support  X\ \\RCp  
  //}}AFX_VIRTUAL N(}7M~m>  
  // Implementation f;pR8  
 protected: ~?-U J^#  
  //{{AFX_MSG(CAboutDlg) {*t'h?b  
  //}}AFX_MSG Fm,A<+l@u  
  DECLARE_MESSAGE_MAP() ahS*YeS7  
}; }PyAmh$@  
>}O1lsjW:z  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) X'jEI{1w  
{ nf /iZ &  
 //{{AFX_DATA_INIT(CAboutDlg) %nOBsln  
 //}}AFX_DATA_INIT HC4ad0Gs+{  
} KzeA+PI  
(LRv c!`"  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) jfqWcX.X=  
{ XT~JP  
 CDialog::DoDataExchange(pDX); * 2T&pX  
 //{{AFX_DATA_MAP(CAboutDlg) C+ r--"Z  
 //}}AFX_DATA_MAP :'Imz   
} lEZ[0oa  
RURO0`^  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) _ZzPy;[i?  
 //{{AFX_MSG_MAP(CAboutDlg) m]N 4.J  
 // No message handlers 9qQ_#$Vv  
 //}}AFX_MSG_MAP t wtGkkC  
END_MESSAGE_MAP() f5wOk& G  
L\_8}\  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) DWk'6;e4j  
: CDialog(CCaptureDlg::IDD, pParent) {E6b/G?Q  
{ ~LO MwMHl  
 //{{AFX_DATA_INIT(CCaptureDlg) vCbqZdy?  
  m_bControl = FALSE; 4p>@UB&U  
  m_bAlt = FALSE; =#T6,[5  
  m_bShift = FALSE; 5[X^1  
  m_Path = _T("c:\\"); ;5"r)F+P  
  m_Number = _T("0 picture captured."); ]ueq&|  
  nCount=0; 8xg:ItJaA0  
  bRegistered=FALSE; )5d&K8@  
  bTray=FALSE; +*)B;)P  
 //}}AFX_DATA_INIT Kj}hb)HU  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 (sJ{27b_  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); _rs!6tp  
} 1xM&"p:  
_=q)lt-UY  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) }#EiL !Pv  
{ V}pw ,2s  
 CDialog::DoDataExchange(pDX); RS<c&{?  
 //{{AFX_DATA_MAP(CCaptureDlg) y"$|?187x  
  DDX_Control(pDX, IDC_KEY, m_Key); `x6 i5mp  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); a2Q9tt>Q  
  DDX_Check(pDX, IDC_ALT, m_bAlt); :7:Nx`D8  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 1;vn*w`p  
  DDX_Text(pDX, IDC_PATH, m_Path); ^"6xE nA]  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 'n!;7*  
 //}}AFX_DATA_MAP U G^6I5  
} YIgzFt[L  
] =>vv;L  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ;?zb (2  
//{{AFX_MSG_MAP(CCaptureDlg) ((EN&X,v  
 ON_WM_SYSCOMMAND() C"IPCJYn  
 ON_WM_PAINT() 0~Yg={IKhK  
 ON_WM_QUERYDRAGICON() bi KpV? Dp  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ?PyI#G   
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) /o8`I m   
 ON_BN_CLICKED(ID_CHANGE, OnChange) [^ 7^&/0  
//}}AFX_MSG_MAP ttZ!P:H2  
END_MESSAGE_MAP() W.zA1S  
4X#>;  
BOOL CCaptureDlg::OnInitDialog() ,589/xTA@  
{ z56W5g2  
 CDialog::OnInitDialog(); *tz"T-6O  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); _Mq@58q'  
 ASSERT(IDM_ABOUTBOX < 0xF000); .HZYSY:X  
 CMenu* pSysMenu = GetSystemMenu(FALSE); x*BfRj  
 if (pSysMenu != NULL) 1K^/@^  
 { ^x 4,}'(  
  CString strAboutMenu;  `9S<E  
  strAboutMenu.LoadString(IDS_ABOUTBOX); vhWj_\m  
  if (!strAboutMenu.IsEmpty()) I+`~6  
  { Cd|V<BB9  
   pSysMenu->AppendMenu(MF_SEPARATOR); v{?9PRf\s  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); z?j~ 2K<4  
  } <Er|s^C  
 } -BQM i0  
 SetIcon(m_hIcon, TRUE); // Set big icon (zJ TBI'  
 SetIcon(m_hIcon, FALSE); // Set small icon !R{L`T0  
 m_Key.SetCurSel(0); QhpE2ICU  
 RegisterHotkey(); Z?"Pkc.Ei  
 CMenu* pMenu=GetSystemMenu(FALSE); YfxZ<  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); UvQxtT]  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 7OC ,KgJ3  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); qG=`'%,m  
 return TRUE; // return TRUE unless you set the focus to a control ;EF s2-{K  
} TrkoLJmB  
`Ph4!-6#  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) aWe H,A%  
{ =B<g_9d4  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) /Pg66H#RUf  
 { 2{+\\.4Evk  
  CAboutDlg dlgAbout; J&8l1{gd  
  dlgAbout.DoModal(); Q$kSK+ q!  
 } ,"j |0Q  
 else .O1g'%  
 { 8{Zgvqbb  
  CDialog::OnSysCommand(nID, lParam); t&0n"4$d'  
 } A[oi?.D  
} 5f}63as  
G _42ckLq  
void CCaptureDlg::OnPaint() 2+"#  
{ @*%5"~F  
 if (IsIconic()) r<&d1fM;X  
 { dBobVT'  
  CPaintDC dc(this); // device context for painting ;zSh9H  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); w? !@fu  
  // Center icon in client rectangle *QjFrw3  
  int cxIcon = GetSystemMetrics(SM_CXICON); (]mN09uE  
  int cyIcon = GetSystemMetrics(SM_CYICON); .f(x9|K^  
  CRect rect; ] MUuz'<  
  GetClientRect(&rect); Eg  w?  
  int x = (rect.Width() - cxIcon + 1) / 2; 3ufUB^@4v  
  int y = (rect.Height() - cyIcon + 1) / 2; M5 Pvc  
  // Draw the icon X*%KR4`  
  dc.DrawIcon(x, y, m_hIcon); jw(v08u >  
 } lW^RwNcd  
 else S1&6P)X.Za  
 { dLQ!hKD~  
  CDialog::OnPaint(); $stJ+uh  
 } J tYnBg?[E  
} mI"|^!L  
6"jq/Pu  
HCURSOR CCaptureDlg::OnQueryDragIcon() 42# rhgW  
{ !30Dice  
 return (HCURSOR) m_hIcon; 5p=T*Y  
} 47 m:z5;  
Dyt}"r\  
void CCaptureDlg::OnCancel() D}\% Q #  
{ 5 ^f>L2  
 if(bTray) 5^0W\  
  DeleteIcon(); 7*@qd&  
  CDialog::OnCancel(); #G9S[J=xe  
} Q3z-v&^E9  
QabF(}61  
void CCaptureDlg::OnAbout() K-p1v!IC  
{ #\t?`\L3  
 CAboutDlg dlg; bX5>qqB]  
 dlg.DoModal(); ;znIY&Z  
} tM{t'WU  
 eCk}B$ 2  
void CCaptureDlg::OnBrowse() NsWyxcty  
{ Ej6vGC.,  
 CString str; ir%/9=^d  
 BROWSEINFO bi; e-{k;V7b  
 char name[MAX_PATH]; oqUtW3y  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); g<}K^)x  
 bi.hwndOwner=GetSafeHwnd(); uWi+F)GS^K  
 bi.pszDisplayName=name; :[\}Hn=  
 bi.lpszTitle="Select folder"; 7CM<"pV  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Q> @0'y=s  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Et`z7Q*e  
 if(idl==NULL) }@a_x,O/x}  
  return; #.Ft PR  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); v0= ^Hy m  
 str.ReleaseBuffer(); ^U:pv0Qz  
 m_Path=str; _~5{l_v|I  
 if(str.GetAt(str.GetLength()-1)!='\\') 1(rH5z'F  
  m_Path+="\\"; oh#6>|  
 UpdateData(FALSE); gZ/M0px  
} /lAt&0  
r+ v*(Tu  
void CCaptureDlg::SaveBmp() .xCO_7Rd  
{ 3VA Lrb;  
 CDC dc; m:Z=: -x  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); yWt87+%T  
 CBitmap bm; V\)@Yk2  
 int Width=GetSystemMetrics(SM_CXSCREEN); 6^UeEmjc  
 int Height=GetSystemMetrics(SM_CYSCREEN); JBi<TDm/  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ,$W7Q  
 CDC tdc; )Hl;9  
 tdc.CreateCompatibleDC(&dc); (j}"1  
 CBitmap*pOld=tdc.SelectObject(&bm); K~v"%sG{`  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); *4]I#N  
 tdc.SelectObject(pOld); x:@HtTX  
 BITMAP btm; F/&Z1G.  
 bm.GetBitmap(&btm); ",`fGu )  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; y=5s~7]  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); x1Z?x,-D"  
 BITMAPINFOHEADER bih; wdl6dLu  
 bih.biBitCount=btm.bmBitsPixel; uK}k]x\z  
 bih.biClrImportant=0; duT2:~H2  
 bih.biClrUsed=0; ihf5`mk/$  
 bih.biCompression=0; 0=L:8&m  
 bih.biHeight=btm.bmHeight; |2{y'?,  
 bih.biPlanes=1; Mq6.!j  
 bih.biSize=sizeof(BITMAPINFOHEADER); .CrahV1G  
 bih.biSizeImage=size; }_gCWz-5?  
 bih.biWidth=btm.bmWidth; a|T P2m  
 bih.biXPelsPerMeter=0; A&F@+X6@  
 bih.biYPelsPerMeter=0; 3V LwMF?  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); I)Lg=n$  
 static int filecount=0; 9[6xo!  
 CString name; ?&"cI5-  
 name.Format("pict%04d.bmp",filecount++); *sZOws<  
 name=m_Path+name; Ok2k; +l  
 BITMAPFILEHEADER bfh; D|`[ [  
 bfh.bfReserved1=bfh.bfReserved2=0; aq,&W q@  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 4TC !P}  
 bfh.bfSize=54+size; b\dBt#mB!  
 bfh.bfOffBits=54; Qighvei  
 CFile bf; m0XK?;\V  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 3DMfR ofg  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); VX2bC(E'%  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); vr=iG xD  
  bf.WriteHuge(lpData,size); C03ehjT<  
  bf.Close(); @j5W4HU  
  nCount++; VU}UK$JN  
 } +Rxf~m(pV  
 GlobalFreePtr(lpData); x_bS-B)%Y:  
 if(nCount==1) ,? <jue/bd  
  m_Number.Format("%d picture captured.",nCount); %HwPOEJ  
 else y%`^* E&  
  m_Number.Format("%d pictures captured.",nCount); 6hAeLlU1  
  UpdateData(FALSE); mY#[D; mUe  
} e=1&mO?  
jO<K0c c  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) BLuILE:$  
{ s1:UCv-%  
 if(pMsg -> message == WM_KEYDOWN) $zyY"yWRZ  
 { a}0\kDe  
  if(pMsg -> wParam == VK_ESCAPE) u <D&RT  
   return TRUE; WI](a8bm  
  if(pMsg -> wParam == VK_RETURN) qW $IpuK  
   return TRUE; Y'%sA~g  
 } AX<TkS@wjb  
 return CDialog::PreTranslateMessage(pMsg); }!lLA4XRr  
} [$OD+@~A2  
2 ,E&}a|;b  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Pm%ZzU  
{ @,pO%,E6  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ l4|bpR Cp  
  SaveBmp(); Uj1^?d+b  
  return FALSE; dB^J}_wp  
} W^60BZ  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ n"(n*Hf7b  
 CMenu pop; k "'q   
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); dxUq5`#G,  
 CMenu*pMenu=pop.GetSubMenu(0); L8T T54fM  
 pMenu->SetDefaultItem(ID_EXITICON); cQ1oy-paD  
 CPoint pt; ce 1KUwo]  
 GetCursorPos(&pt); :sk7`7v  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); %:YON,1b=7  
 if(id==ID_EXITICON) p_!Y:\a5  
  DeleteIcon(); E9!IGci  
 else if(id==ID_EXIT) ofj7$se  
  OnCancel(); g@`14U/|  
 return FALSE; K3!|k(jt  
} M)V z9,  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); TM[Z~n(wt  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Ep.,2H  
 AddIcon(); #xm<|s   
 return res; Cdot l$'  
} D0us<9q  
=@G#c5H*  
void CCaptureDlg::AddIcon() bhnm<RZ  
{ m:/nw,  
 NOTIFYICONDATA data; It(8s)5  
 data.cbSize=sizeof(NOTIFYICONDATA); )PB&w%J  
 CString tip; {KdC5 1"Nv  
 tip.LoadString(IDS_ICONTIP); QE=Cum  
 data.hIcon=GetIcon(0); *{)[:;  
 data.hWnd=GetSafeHwnd(); E)NH6 ~  
 strcpy(data.szTip,tip); B`T|M$Ug  
 data.uCallbackMessage=IDM_SHELL; t A\N$  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; k2j:s}RHY  
 data.uID=98; q !EJs:AS  
 Shell_NotifyIcon(NIM_ADD,&data); D2[uex  
 ShowWindow(SW_HIDE); )wCA8  
 bTray=TRUE; 4 (bV#   
} @HMt}zD  
:_p3nb[r  
void CCaptureDlg::DeleteIcon() `a3q)}*Y  
{ %*oz~,i  
 NOTIFYICONDATA data; E )09M%fe  
 data.cbSize=sizeof(NOTIFYICONDATA); cx1U6A+  
 data.hWnd=GetSafeHwnd(); mhnD1}9,Ih  
 data.uID=98; `0=0IPVd  
 Shell_NotifyIcon(NIM_DELETE,&data); o3]B/  
 ShowWindow(SW_SHOW); &&M-5XD  
 SetForegroundWindow(); >O9j},X  
 ShowWindow(SW_SHOWNORMAL); jf$6{zO6j  
 bTray=FALSE; X>wB=z5PXK  
} s lDxsb  
/49PF:$?  
void CCaptureDlg::OnChange() r*0a43mC1  
{ U@ALo  
 RegisterHotkey(); `(_cR@\  
} gTH1FR8$y  
T9*\I TA  
BOOL CCaptureDlg::RegisterHotkey() c<y.Y0  
{ ~Rs|W;  
 UpdateData(); 9hmCvQgtf  
 UCHAR mask=0; \-#~)LB]M  
 UCHAR key=0; ]6pxd \Q  
 if(m_bControl) y~SFlv36  
  mask|=4; O->i>d  
 if(m_bAlt) Z?ZcQ[eC  
  mask|=2; b+OLmd  
 if(m_bShift) ]^3_eHa^d  
  mask|=1; OcQ_PE5\  
  key=Key_Table[m_Key.GetCurSel()]; w> IkC+.?  
 if(bRegistered){ Q2Yv8q_}Uq  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); &A*oQ3  
  bRegistered=FALSE; LJc w->  
 } K.*?\)&  
 cMask=mask; N`8!h:yL  
 cKey=key; ^t*+hFEI  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); C$"jZcm,I  
 return bRegistered; v|?hc'Fj  
} nxsQDw\hy  
3+EJ%  
  四、小结 v@XQ)95]F  
bL)g+<:F  
  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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