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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: sZL#xZ5 Df  
  ?F6pEt4  
  一、实现方法 vt;{9\Y  
nM-h&na{s  
  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: 'eJ+JM<0%  
b D[!/'4eJ  
#pragma data_seg("shareddata") '6xQT-sUih  
HHOOK hHook =NULL; //钩子句柄 i 4%xfN  
UINT nHookCount =0; //挂接的程序数目 ,>:;#2+og  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ]Qfn(u=o  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ,^x4sA[/  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey NyVnA  
static int KeyCount =0; KA){''>8  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 z[cyA.  
#pragma data_seg() f~d d3m('  
@Q^P{  
  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。 >9q&PEc  
|iR T! ]  
  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: ;3kj2}  
E 2"q3_,,  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR fVt9X*xK S  
cKey,UCHAR cMask) t7m>A-I  
{ |pmZ.r  
 BOOL bAdded=FALSE; LwK+:4$  
 for(int index=0;index<MAX_KEY;index++){ (q4),y<:[  
  if(hCallWnd[index]==0){ t@R ?Rgu3  
   hCallWnd[index]=hWnd; -GqT7`:(H4  
   HotKey[index]=cKey; ltgc:&=|@  
   HotKeyMask[index]=cMask; *r=:y{!Yd  
   bAdded=TRUE; Gu'rUo3Do  
   KeyCount++; Pj4/xX  
   break; *+\S yO  
  } h~p>re  
 } o4%y>d)  
 return bAdded; g"?Y+j  
} 59%tXiO  
//删除热键 wmTq` XH)  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) l"!Ko G7  
{ p8\zG|b5  
 BOOL bRemoved=FALSE; PC[c/CoD  
 for(int index=0;index<MAX_KEY;index++){ B';6r4I-  
  if(hCallWnd[index]==hWnd){ XP1~d>j  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ >j'ZPwj^  
    hCallWnd[index]=NULL; e][B7wZ  
    HotKey[index]=0; /,X[k !  
    HotKeyMask[index]=0; *3&fqBg  
    bRemoved=TRUE; Ty<L8+B|  
    KeyCount--; AN24Sf'`  
    break; K)-m*#H&uw  
   } xw3YK!$sIF  
  } 6X\ 2GC9  
 } nIoPC[%_  
 return bRemoved; s.x&LG  
} g=]u^&  
 k0  
X*,%&6O*  
  DLL中的钩子函数如下: sL@U  
sPpsq  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Wa1, p  
{ dpFVN[\oK  
 BOOL bProcessed=FALSE; ,uPJ_oZs  
 if(HC_ACTION==nCode) _^ 'I  
 { V`RNM%Y  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 :pF_GkG  
   switch(wParam) a?6a b+7#  
   {  qKE:3g35  
    case VK_MENU: 9!Ar`Io2@  
     MaskBits&=~ALTBIT; \MmI`$  
     break; w 1Ec_y{  
    case VK_CONTROL: >^Yq|~[  
     MaskBits&=~CTRLBIT; sk 2-5S  
     break; IhBp%^H0-  
    case VK_SHIFT: N*`b%XGn3  
     MaskBits&=~SHIFTBIT; +Ag!?T  
     break; vi|R(&  
    default: //judge the key and send message kdCP  
     break; v9D22,K-  
   } x&`~R>5/  
   for(int index=0;index<MAX_KEY;index++){ h[?O+Z^  
    if(hCallWnd[index]==NULL) *$"gaXI  
     continue; |0\0a&tkPl  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Hw|AA?,0-  
    { u@.>Z{h  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); "n: %E  
     bProcessed=TRUE; RKa}$ 7  
    } ZWm8*}3]7_  
   } !TP@- X;  
  } dTL5-@  
  else if((lParam&0xc000ffff)==1){ //有键按下 zOSs[[  
   switch(wParam) rC7``#5  
   { 2<][%> '  
    case VK_MENU: F! X}(N?t  
     MaskBits|=ALTBIT; +E;2d-x*p  
     break; sU"}-de  
    case VK_CONTROL: cwuO[^S}  
     MaskBits|=CTRLBIT; I`w4Xrd  
     break; (__yh^h:m  
    case VK_SHIFT: 7;tJK^J`  
     MaskBits|=SHIFTBIT; !bD@aVf?5  
     break; >rP#ukr5  
    default: //judge the key and send message  X!j{o  
     break; g >'p>}t  
   } v|ck>_" .  
   for(int index=0;index<MAX_KEY;index++){ v"MX>^/<  
    if(hCallWnd[index]==NULL) ] )"u+  
     continue; {w8 NN-n  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) U^.4Hy&D  
    { )OLq_':^ @  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); TP}h~8 /;  
     bProcessed=TRUE; R.s^o]vT  
    } eVR5Xar  
   } v$)q($}p  
  } /Ux*u#  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 0}:2Q#  
   for(int index=0;index<MAX_KEY;index++){ Y(+^;Y3U  
    if(hCallWnd[index]==NULL) Rm5Kkzd0o  
     continue; r,]#b[:.s|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) QeDQ o  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ?hR7<02  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 WnH UE  
   } Y];Ycj;  
  } qTB$`f'|$  
 } HJC(\\~  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); i,nm`Z>u  
} bC^(U`y32  
'i8 U  
  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: T?p`)  
yE\wj  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); pCu!l#J  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  8*c3|  
YxGcFjJ  
  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: Otz E:qe  
 x-'~Bu  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) XG@`ZJhU6  
{ J@ L9p46,  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) S|zW^|YU  
 { Z Dhx5SL&  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ;+I/I9~  
  SaveBmp(); <N(oDaU  
  return FALSE; axk"^gps  
 } nq1 9Q)  
 …… //其它处理及默认处理 $2MAZGJV  
} a Zk&`Jpz  
y#<MV H  
fRvAKz|rL  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 kL90&nP   
#RMI&[M  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 2`a q**}  
SMf+qiM-E  
  二、编程步骤 F=)&98^v$_  
j+8TlVur  
  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"; :+%Zh@u\  
>az;!7~cD  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; B(DrY1ztj  
;XC@ =RpX  
  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; U{ ;l0 2S  
e.o;eD}"  
  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; *RR[H6B^]X  
 UkfB^hA  
  5、 添加代码,编译运行程序。 +<.\5+  
-#29xRPk  
三、程序代码 w# * 1/N  
%@R~DBS  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL XMRNuEU  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Z?^"\u-  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ @ 2_<,;$  
#if _MSC_VER > 1000 aj ~bt-cE  
#pragma once ]bgY6@M  
#endif // _MSC_VER > 1000 #*c F8NV-  
#ifndef __AFXWIN_H__ 'ZQWYr9R  
#error include 'stdafx.h' before including this file for PCH tVqmn  
#endif "Jy~PcJZ1  
#include "resource.h" // main symbols n(lk dw  
class CHookApp : public CWinApp lM#A3/=K  
{ O}#yijU3e  
 public: &s)0z)mR8&  
  CHookApp(); 3,);0@I  
  // Overrides 7W9~1 .SC  
  // ClassWizard generated virtual function overrides IC{F.2D  
  //{{AFX_VIRTUAL(CHookApp) Gy@7Xf  
 public: m= b~i^@  
  virtual BOOL InitInstance(); gor <g))\  
  virtual int ExitInstance(); }'=h 4yI  
  //}}AFX_VIRTUAL 0+b 0<  
  //{{AFX_MSG(CHookApp) On1v<SD$[  
  // NOTE - the ClassWizard will add and remove member functions here. S*)o)34 U  
  // DO NOT EDIT what you see in these blocks of generated code ! q9dLHi<1  
  //}}AFX_MSG 4S L_-Hm.  
  DECLARE_MESSAGE_MAP() }~o ikN:  
}; z8Q"% @  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ]v5-~E!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Y'Z+, CNf  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); HXJ9xkrr  
BOOL InitHotkey(); -U>7 H`5  
BOOL UnInit(); (tl}q3U  
#endif fw{,bJ(U  
.h;Se  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. >&H~nGP.  
#include "stdafx.h" t#<KxwhcN  
#include "hook.h" hN(L@0)  
#include <windowsx.h> Z,WW]Y,$  
#ifdef _DEBUG {@r*+~C3  
#define new DEBUG_NEW :w?7j_p#  
#undef THIS_FILE g-yi xU  
static char THIS_FILE[] = __FILE__; }.:d#]g8  
#endif }#=Od e  
#define MAX_KEY 100 [.q(h/b  
#define CTRLBIT 0x04 vZajT!h  
#define ALTBIT 0x02 K@@9:T$  
#define SHIFTBIT 0x01 >Wh3MG6  
#pragma data_seg("shareddata") y67uH4&Vm  
HHOOK hHook =NULL; ggou*;'  
UINT nHookCount =0; !%mi&ak(Rn  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey W>L@j(  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT =p&sl;PsLw  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 4w{-'M.B  
static int KeyCount =0; Yb=6C3l@  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift wk 02[  
#pragma data_seg() E '%lxr  
HINSTANCE hins; * Zd_ HJi  
void VerifyWindow(); _2jw,WKr  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) z};ZxN  
//{{AFX_MSG_MAP(CHookApp) kb|eQtH  
// NOTE - the ClassWizard will add and remove mapping macros here. bZ# X 9fT  
// DO NOT EDIT what you see in these blocks of generated code! 'Kis hXOn]  
//}}AFX_MSG_MAP aed+C:N  
END_MESSAGE_MAP() lug} Uj  
=ef1XQ{i*  
CHookApp::CHookApp() ARx0zI%N  
{ 3$"/>g/  
 // TODO: add construction code here, \8"QvC]  
 // Place all significant initialization in InitInstance ;aK.%-s-Z  
} Q#WE|,a  
M^ 5e~y  
CHookApp theApp; :pd&dg!5  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 8Inx/>eOI  
{ F14(;'Az  
 BOOL bProcessed=FALSE; pN$;!  
 if(HC_ACTION==nCode) w4{y "A  
 { Lh 9S8EU  
  if((lParam&0xc0000000)==0xc0000000){// Key up d,R6` i  
   switch(wParam) Zu=kT}aGg  
   { } gkP  
    case VK_MENU: b%nkIPA  
     MaskBits&=~ALTBIT; 9bEM#Hj  
     break; VD#!ztcY'  
    case VK_CONTROL: bag&BHw  
     MaskBits&=~CTRLBIT; pGGV\zD^  
     break; O3ZM:,.  
    case VK_SHIFT: =hcPTU-QU  
     MaskBits&=~SHIFTBIT; CT}' ")Bm  
     break; u)7 ]1e{  
    default: //judge the key and send message baIbf@t/  
     break; l7Lj[d<n  
   } >h[(w  
   for(int index=0;index<MAX_KEY;index++){ sA\L7`2H  
    if(hCallWnd[index]==NULL) M@O2 WB1ws  
     continue; sPpS~wk*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) nx;$dxx_Ws  
    { 4p x_ZD#J  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); E!@/NE\-  
     bProcessed=TRUE; E|,30Z+  
    } jm> U6  
   } E{gv,cUM  
  } ou;qO 5CT  
  else if((lParam&0xc000ffff)==1){ //Key down hrT%XJl  
   switch(wParam) QSmJ`Bm  
   { `Z8^+AMc  
    case VK_MENU: 0IFlEe[>#  
     MaskBits|=ALTBIT; sJ7sjrEp 1  
     break; </yo9.  
    case VK_CONTROL: lzoeST  
     MaskBits|=CTRLBIT; VV\Xb31J  
     break; !2tw,QM  
    case VK_SHIFT: e;;):\p4  
     MaskBits|=SHIFTBIT; yId;\o B  
     break; ~BQV]BJ7  
    default: //judge the key and send message Bhx<g&|j  
     break; _vIO !*h0  
   } fkBLrw  
   for(int index=0;index<MAX_KEY;index++) {~nvs4X  
   { kdBV1E+:C  
    if(hCallWnd[index]==NULL) /u ?9S/  
     continue; _-6e0srZ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) hpjUkGm5  
    { b=_{/F*b?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); :p&IX"Hh  
     bProcessed=TRUE; #|ddyCg2  
    } cdN/Qy  
   } #Jv43L H  
  } }\4p3RQrz  
  if(!bProcessed){ p6[#f96^u  
   for(int index=0;index<MAX_KEY;index++){ GY7s  
    if(hCallWnd[index]==NULL) _iq2([BpL  
     continue; JE9>8+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) wlL8X7+:  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 0`Gai2\1@  
   } R|H[lbw  
  } = uk`pj  
 } Me<du& T  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); \KN dZC?V2  
} r!~(R+,c  
rV~T>x  
BOOL InitHotkey() `11#J;[@G  
{ wH#-mu#Yl<  
 if(hHook!=NULL){ Tr$i= M  
  nHookCount++; g#Mv&tU  
  return TRUE; jPpRsw>  
 } eB7>t@ED  
 else & L3UlL  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); t5n2eOy~T  
  if(hHook!=NULL) [5!'ykZ  
   nHookCount++; HrDTn&/  
  return (hHook!=NULL); . Jb?]n  
} CvP`2S\  
BOOL UnInit() M`bL5J;  
{ 1N>6rN  
 if(nHookCount>1){ 1GUqT 9)  
  nHookCount--; rWqkdi1  
  return TRUE; >"O1`xdG  
 } '1]+8E `Z  
 BOOL unhooked = UnhookWindowsHookEx(hHook); l3BD <PB2S  
 if(unhooked==TRUE){ 2DUr7r M  
  nHookCount=0; /<6ywLD  
  hHook=NULL; \ U Ax(;  
 } ^J0zXe -d  
 return unhooked; [\88@B=jXP  
} w/O<.8+  
_ r~+p  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) [4ee <J  
{ T ^N L:78  
 BOOL bAdded=FALSE; -!i;7[N  
 for(int index=0;index<MAX_KEY;index++){ mZ~mf->%  
  if(hCallWnd[index]==0){ 2|$lk8/,  
   hCallWnd[index]=hWnd; )>?! xx_`  
   HotKey[index]=cKey; -`Da`ml  
   HotKeyMask[index]=cMask; (eki X*y  
   bAdded=TRUE; >H)^6sJ;%b  
   KeyCount++; u >81dO]H  
   break; xJ N|w\&  
  } 0Y[*lM-  
 } ~Vwk:+):  
 return bAdded; #>@<n3rq  
} <Kh?Ad>N  
?_8%h`z  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) T.J`S(oI  
{ pn|p(6  
 BOOL bRemoved=FALSE; DL %S(l  
 for(int index=0;index<MAX_KEY;index++){ V;H d)v( j  
  if(hCallWnd[index]==hWnd){ _k6x=V;9g  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ DakLD~H;  
    hCallWnd[index]=NULL; i^/ eN  
    HotKey[index]=0; L7s>su|c(  
    HotKeyMask[index]=0; tF<^9stM  
    bRemoved=TRUE; #"hJpyW 4V  
    KeyCount--; 7[4_+Q:}  
    break; ^GE^Q\&D&  
   } =d}gv6v2S  
  } ^WmGo]<B_  
 } \5t`p67Ve_  
 return bRemoved; <"hb#Tn  
}  <V7SSm  
j.<:00<  
void VerifyWindow() MRjH40" 2  
{ +{5JDyh0  
 for(int i=0;i<MAX_KEY;i++){ 1XqIPiXJ  
  if(hCallWnd!=NULL){ -)4uYK*  
   if(!IsWindow(hCallWnd)){ U~oBNsU"  
    hCallWnd=NULL; 1d/NZJ9  
    HotKey=0; Po'-z<}wS  
    HotKeyMask=0; +ylxezc  
    KeyCount--; xOwNCh  
   } P/C&R-{')  
  } S&5Q~}{,  
 } mfu*o0   
} g8LT7  
di"C]" ;  
BOOL CHookApp::InitInstance() N-X VRuv  
{ s.VUd R"  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); fEHh]%GT`  
 hins=AfxGetInstanceHandle(); &7$,<9.  
 InitHotkey(); D/gd  
 return CWinApp::InitInstance(); kuWK/6l4  
} IRlN++I!  
6e-#XCR{  
int CHookApp::ExitInstance() FYp|oD2=1  
{ gsLr=  
 VerifyWindow(); jK\V|5k  
 UnInit(); "}0)YRz%  
 return CWinApp::ExitInstance(); +R2^* *<  
} a];BW)  
cSY2#u|v  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file u(8_[/_B  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) nu;} S!J  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 30A`\+^f  
#if _MSC_VER > 1000 kyy0&L  
#pragma once  QpdujtH`  
#endif // _MSC_VER > 1000 bc `UA  
T g3:VD  
class CCaptureDlg : public CDialog <I>%m,  
{ =@Q#dDnFu%  
 // Construction ,AdusM  
 public: Ix*BI9E  
  BOOL bTray; 0 $n8b/%.  
  BOOL bRegistered; ^^n +  
  BOOL RegisterHotkey(); T [i7C3QS  
  UCHAR cKey; xP8iz?6"V  
  UCHAR cMask; (:_%kmu  
  void DeleteIcon(); ybD{4&ZE  
  void AddIcon(); l4iuu  
  UINT nCount; W2}%zux  
  void SaveBmp(); 08zi/g2 3  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor i!CKA}",  
  // Dialog Data &_< VZS  
  //{{AFX_DATA(CCaptureDlg) OT-n\sL$  
  enum { IDD = IDD_CAPTURE_DIALOG }; RY\{=f  
  CComboBox m_Key; KU1+<OCh  
  BOOL m_bControl; b}ySZlmy  
  BOOL m_bAlt; K)yCrEZ  
  BOOL m_bShift; "WF( 6z#  
  CString m_Path; >{O[t2&  
  CString m_Number; l@,);w=_P  
  //}}AFX_DATA g0^~J2sDd  
  // ClassWizard generated virtual function overrides >Sc$R0  
  //{{AFX_VIRTUAL(CCaptureDlg) mA&RN"+V  
 public: F3k C"H  
  virtual BOOL PreTranslateMessage(MSG* pMsg); S% JNxT7'  
 protected: &,W_#l{  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support D}zOuB,S  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); gGtep*k  
  //}}AFX_VIRTUAL SRA|7g}7W  
  // Implementation 1Pud,!\%q  
 protected: pieU|?fQ  
  HICON m_hIcon; p<Zs*  @  
  // Generated message map functions Jo6~r-  
  //{{AFX_MSG(CCaptureDlg) ]I{qp~^#n  
  virtual BOOL OnInitDialog(); n.2E8m/  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); vDu0  
  afx_msg void OnPaint(); tb-OKZq  
  afx_msg HCURSOR OnQueryDragIcon(); uB5h9&57  
  virtual void OnCancel(); a<OCO0irJ  
  afx_msg void OnAbout(); ](B& l{V  
  afx_msg void OnBrowse(); uznoyj6g  
  afx_msg void OnChange(); .jU|gf:x  
 //}}AFX_MSG v YRt2({}Z  
 DECLARE_MESSAGE_MAP() +zFV~]b  
}; xFsB?d  
#endif kWZ/ej  
jOoIF/So  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file "| .  +L  
#include "stdafx.h" *=-__|t  
#include "Capture.h" WmT}t  
#include "CaptureDlg.h" $$2S*qY  
#include <windowsx.h>  At`1)  
#pragma comment(lib,"hook.lib") % j[O&[s}  
#ifdef _DEBUG ,W)IVc   
#define new DEBUG_NEW s=^r/Sz902  
#undef THIS_FILE u^#4G7<  
static char THIS_FILE[] = __FILE__; 33#7U+~]@  
#endif gFWEodx,9  
#define IDM_SHELL WM_USER+1 {Y3_I\H8{  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &%f]-=~  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 3b g4#c  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ^DW#  
class CAboutDlg : public CDialog /(hP7_]`2  
{ b qg]DO$*  
 public: ; McIxvj  
  CAboutDlg(); r 85Xa'hh  
  // Dialog Data ,? 0-=o  
  //{{AFX_DATA(CAboutDlg) F:*[  
  enum { IDD = IDD_ABOUTBOX }; LyJTK1]#  
  //}}AFX_DATA a@5xz)  
  // ClassWizard generated virtual function overrides 877EKvsiC  
  //{{AFX_VIRTUAL(CAboutDlg) q G :jnl  
 protected: j=xtnIq  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support \U)2 Tg  
  //}}AFX_VIRTUAL @yU!sE:  
  // Implementation h}anTFKP  
 protected: w-0O j  
  //{{AFX_MSG(CAboutDlg) t6<sNz F&  
  //}}AFX_MSG /XWPN(JC?  
  DECLARE_MESSAGE_MAP() Ie^Dn!0S  
}; W%cj39$  
rj2r#{[  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)  Vq .!(x  
{ Kc JP^  
 //{{AFX_DATA_INIT(CAboutDlg) c:?#zX  
 //}}AFX_DATA_INIT %vf2||a$BS  
} v GR \GFm  
6mI_Q2  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) |l6<GWG+  
{ O]Ry3j  
 CDialog::DoDataExchange(pDX); 5O;a/q8"  
 //{{AFX_DATA_MAP(CAboutDlg) uh C=  
 //}}AFX_DATA_MAP #FQm/Q<0  
} Kh:#S|   
;G%wc!  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) [5RFQ!  
 //{{AFX_MSG_MAP(CAboutDlg) we:5gK &  
 // No message handlers ? !oVf>  
 //}}AFX_MSG_MAP /+<%,c$n  
END_MESSAGE_MAP() 8}"f|6Wm  
fncwe ';?  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) FfD ,cDs  
: CDialog(CCaptureDlg::IDD, pParent) 7kX7\[zN  
{ 2vh!pez_  
 //{{AFX_DATA_INIT(CCaptureDlg) JL.yd H79  
  m_bControl = FALSE; (:fE _H2z  
  m_bAlt = FALSE;  z~}StCH(  
  m_bShift = FALSE; 7+D'W7Yx  
  m_Path = _T("c:\\"); j^aQ>(t(9  
  m_Number = _T("0 picture captured."); D)O6| DiO  
  nCount=0;  0'V-  
  bRegistered=FALSE; _pH6uuB  
  bTray=FALSE; A5.'h<  
 //}}AFX_DATA_INIT (. quX@w"m  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ,rH)}C<Q+  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); &-8-xw#.  
} ~P]HG;$?n  
-h G 9  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) r_g\_y7ua  
{ Cb@S </b  
 CDialog::DoDataExchange(pDX); ohc/.5Kl  
 //{{AFX_DATA_MAP(CCaptureDlg) S0Bl?XsD_  
  DDX_Control(pDX, IDC_KEY, m_Key); _ntW}})K  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); I(?|Ox9"?  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ziLr }/tg  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); pzt Zb  
  DDX_Text(pDX, IDC_PATH, m_Path); px [1#*  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 5QL9 w3L  
 //}}AFX_DATA_MAP -aH?7HV}  
} YzhN|!;!k  
@KW+?maW  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) _~w V{ yp  
//{{AFX_MSG_MAP(CCaptureDlg) QN}3S0  
 ON_WM_SYSCOMMAND() +3o)L?:g  
 ON_WM_PAINT() =qS^Wz.  
 ON_WM_QUERYDRAGICON() DETajf/<F  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Z|Lh^G  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ];b!*Z  
 ON_BN_CLICKED(ID_CHANGE, OnChange) :i,c<k  
//}}AFX_MSG_MAP ,8J*S  
END_MESSAGE_MAP() 9$Pl'>5  
F'5d\v  
BOOL CCaptureDlg::OnInitDialog() :`>+f.)  
{ Z z; <P  
 CDialog::OnInitDialog(); {Jw<<<G  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); W &0@&U  
 ASSERT(IDM_ABOUTBOX < 0xF000); Z '>eT)  
 CMenu* pSysMenu = GetSystemMenu(FALSE); G%p!os\>  
 if (pSysMenu != NULL) :WfB!4%!  
 { B 1d%#  
  CString strAboutMenu; }d~FTre  
  strAboutMenu.LoadString(IDS_ABOUTBOX); @8<uAu%  
  if (!strAboutMenu.IsEmpty()) X^ ^?}>t[  
  { SbPjU5 0  
   pSysMenu->AppendMenu(MF_SEPARATOR); Z'EO   
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); /qkIoF2  
  } X,!OWz:[  
 } B'gk/^6$eg  
 SetIcon(m_hIcon, TRUE); // Set big icon $MJDB  
 SetIcon(m_hIcon, FALSE); // Set small icon [^(R1K  
 m_Key.SetCurSel(0); >e$^# \D  
 RegisterHotkey(); h4B#T'b  
 CMenu* pMenu=GetSystemMenu(FALSE); TNFm7}=  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); L$u&~"z-  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); { Sliy'  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); aD/,c1  
 return TRUE; // return TRUE unless you set the focus to a control <R~~yW:H  
} *Xt c`XH  
0p>:rU~  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 6B;_uIq5  
{ P=sK+}5`q  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) dVmAMQk.g  
 { <1g1hqK3  
  CAboutDlg dlgAbout; E-U;8cOMv  
  dlgAbout.DoModal(); SKc T  
 } ]g-qWSKU  
 else J|2Hqd  
 { U*R~w5W.[  
  CDialog::OnSysCommand(nID, lParam); E=1/  
 } z7Rcnr;  
} ,?~UpsUx  
,md7.z]U~  
void CCaptureDlg::OnPaint() :{N3o:  
{ DHumBnQ  
 if (IsIconic()) !,JT91  
 { /DG`Hg  
  CPaintDC dc(this); // device context for painting U9p.Dh~)vG  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); x{`<);CQ  
  // Center icon in client rectangle |7Xpb  
  int cxIcon = GetSystemMetrics(SM_CXICON); u FYQ^  
  int cyIcon = GetSystemMetrics(SM_CYICON); 7E75s)KH  
  CRect rect; !qGx(D{\  
  GetClientRect(&rect); I`$I0  
  int x = (rect.Width() - cxIcon + 1) / 2; hIO4%RQj_  
  int y = (rect.Height() - cyIcon + 1) / 2; Z=t#*"J  
  // Draw the icon #&2N,M!Q  
  dc.DrawIcon(x, y, m_hIcon); sv{0XVn+^  
 } ^Lv ^W  
 else q;a*gqt   
 { yE|} r  
  CDialog::OnPaint(); z.9FDQLp  
 } ) Q  
} +uiH0iGS  
,Qi|g'a  
HCURSOR CCaptureDlg::OnQueryDragIcon() PN^1  
{ I'%H:53^0  
 return (HCURSOR) m_hIcon; rPGE-d3  
} <:;:*s3]  
twHM~cTS  
void CCaptureDlg::OnCancel() ~S=fMv^BR  
{ [@)z$W  
 if(bTray) gJFpEA {  
  DeleteIcon(); $*)(8Cl  
  CDialog::OnCancel(); 10I`AjF0  
} b;;Kxi:7$}  
&{4Mo,x  
void CCaptureDlg::OnAbout() }L7F g%,  
{ J'^$|/Q  
 CAboutDlg dlg; "T1#*"{j  
 dlg.DoModal(); iN/!k.ybW}  
} [BR}4(7  
RJs G]`  
void CCaptureDlg::OnBrowse() `"=L  
{ aU8Ti8A>  
 CString str; s1vYZ  
 BROWSEINFO bi; NG W{Z~l  
 char name[MAX_PATH]; "JLhOTPaHf  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); |VR5Q(d  
 bi.hwndOwner=GetSafeHwnd(); E?h2e~ ,]  
 bi.pszDisplayName=name; GGQ(|?w  
 bi.lpszTitle="Select folder"; 'W2$wN+P  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; TNT"2FoBd  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); GKx,6E#JM  
 if(idl==NULL) @P5@ &G  
  return; VJtTbt;>  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); <9.7gwzE  
 str.ReleaseBuffer(); D& 6Qk&>  
 m_Path=str; I 3,e)Z  
 if(str.GetAt(str.GetLength()-1)!='\\') DoB3_=yJ+  
  m_Path+="\\"; MG5Sn*(C  
 UpdateData(FALSE); W]Tt8  
} iK:qPrk-  
-L50kk>h  
void CCaptureDlg::SaveBmp() P<JkRX  
{ e}yu<~v_  
 CDC dc; }xlmsOHuI  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); j{-7Pf8A  
 CBitmap bm; ;OCI.S8  
 int Width=GetSystemMetrics(SM_CXSCREEN); ~+iJpW  
 int Height=GetSystemMetrics(SM_CYSCREEN); KPe.AK,8  
 bm.CreateCompatibleBitmap(&dc,Width,Height); R^kv!x;h  
 CDC tdc; *P\_:>bV(  
 tdc.CreateCompatibleDC(&dc); {s'_zS z  
 CBitmap*pOld=tdc.SelectObject(&bm);  p6l@O3  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); TvG:T{jwy  
 tdc.SelectObject(pOld); 3b[+m}UWQ  
 BITMAP btm; D!$ =oK  
 bm.GetBitmap(&btm); Vyq<T(5  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ,u^0V"hJ  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); #|1QA3KzO  
 BITMAPINFOHEADER bih; =y]b|"s~2  
 bih.biBitCount=btm.bmBitsPixel; R9-JjG2v  
 bih.biClrImportant=0; eh/OCzWH  
 bih.biClrUsed=0; ]S aH/$  
 bih.biCompression=0; pV|?dQ  
 bih.biHeight=btm.bmHeight; $M<4Bqr  
 bih.biPlanes=1; WHLKf  
 bih.biSize=sizeof(BITMAPINFOHEADER); gN'i+mQcu  
 bih.biSizeImage=size; v.v%k2;  
 bih.biWidth=btm.bmWidth; E0A|+P '?  
 bih.biXPelsPerMeter=0; x,G6`|Hl  
 bih.biYPelsPerMeter=0; (U(x[Df)  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); +4nR&1z$  
 static int filecount=0; EA E\Xv  
 CString name; Zt0%E <C{  
 name.Format("pict%04d.bmp",filecount++); GE+csnA2  
 name=m_Path+name; yB{o_1tc  
 BITMAPFILEHEADER bfh; q>4i0p8^  
 bfh.bfReserved1=bfh.bfReserved2=0; ^o\p|f>f  
 bfh.bfType=((WORD)('M'<< 8)|'B'); dq/?&X  
 bfh.bfSize=54+size; 5@A=, GPUn  
 bfh.bfOffBits=54; Q~!hr0 ZR  
 CFile bf;  CF92AY  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ^&/&I9z  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); .eXA.9 |jm  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 'J0s%m|j  
  bf.WriteHuge(lpData,size); hg=G//  
  bf.Close(); w$:)wyR-  
  nCount++; =usDI<3r  
 } _`[6jhNa!  
 GlobalFreePtr(lpData); #$B,8LFz,$  
 if(nCount==1) yzR=:0J  
  m_Number.Format("%d picture captured.",nCount); U`_vF~el~  
 else )&!@O$RS8(  
  m_Number.Format("%d pictures captured.",nCount); E!l1a5qB  
  UpdateData(FALSE); Rj;e82%%N  
} "UnSZ[;t  
.ehvhMuG|  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) <FT\u{9$  
{ #$C]0]|  
 if(pMsg -> message == WM_KEYDOWN) q=i<vcw  
 { LK/V]YG  
  if(pMsg -> wParam == VK_ESCAPE) n$Fm~iPo,  
   return TRUE; H{zuIN/.1  
  if(pMsg -> wParam == VK_RETURN) W2Z]?l;vQQ  
   return TRUE; Jxw:Jk ~  
 } ByvqwJY  
 return CDialog::PreTranslateMessage(pMsg); Y[?Wt/O;  
} arL&^]JnZ,  
G6VHl:e7z  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) (w B[ ]O$@  
{ ^uEl QI  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ |L{dQ)-'l  
  SaveBmp(); =e{KtX.  
  return FALSE; &'\+Z  
} 6YGr"Kj &  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ gF5EtdN?|  
 CMenu pop; V46[whL%r  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); &7u Ra1/R  
 CMenu*pMenu=pop.GetSubMenu(0); # h|< >  
 pMenu->SetDefaultItem(ID_EXITICON); \9zC?Cw  
 CPoint pt; yP]W\W'  
 GetCursorPos(&pt); OBQ!0NM_b  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); {;M/J  
 if(id==ID_EXITICON) iPpJ`i#@+  
  DeleteIcon(); _cN)q  
 else if(id==ID_EXIT) (kOv  
  OnCancel(); yS3s5C{C  
 return FALSE; v 8a  
} eW,Pn'  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); M= _CqK*  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) IOqyqt'  
 AddIcon(); XPTB,1g+f  
 return res; Dy@NgHe  
} =JH,RQ *  
wGX"R5  
void CCaptureDlg::AddIcon() }"H900WE|  
{ )pa|uH +N  
 NOTIFYICONDATA data; 1*b%C"C  
 data.cbSize=sizeof(NOTIFYICONDATA); gRI|rDC)B  
 CString tip; nDw9  
 tip.LoadString(IDS_ICONTIP); VSFl9/5?  
 data.hIcon=GetIcon(0); %y+j~]^:  
 data.hWnd=GetSafeHwnd(); --)[>6)I  
 strcpy(data.szTip,tip); Y2&6xTh  
 data.uCallbackMessage=IDM_SHELL; x:lf=D lA  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; lf# six  
 data.uID=98; ]+9:i!s  
 Shell_NotifyIcon(NIM_ADD,&data); U5 "v1"Ec  
 ShowWindow(SW_HIDE); !Sh5o'D28  
 bTray=TRUE; 0N_Da N  
} H/{3 i  
h9nCSj  
void CCaptureDlg::DeleteIcon() 2F7R,rr  
{ rdg1<Z  
 NOTIFYICONDATA data; -~ Q3T9+  
 data.cbSize=sizeof(NOTIFYICONDATA); t}l<#X5  
 data.hWnd=GetSafeHwnd(); uB5o Ghu-  
 data.uID=98; y-k-E/V}  
 Shell_NotifyIcon(NIM_DELETE,&data); vb!KuI!:p  
 ShowWindow(SW_SHOW); E#p6A5  
 SetForegroundWindow(); o!S_j^p[C  
 ShowWindow(SW_SHOWNORMAL); q)zvePO#  
 bTray=FALSE; %*=FLtBjo  
} G[,VPC=  
epm|pA*  
void CCaptureDlg::OnChange() 8, ^UQ5x  
{ 7IH{5o\e  
 RegisterHotkey(); q[K)bg{HB  
} m:CpDxzbf  
qChPT:a  
BOOL CCaptureDlg::RegisterHotkey() CP^^ct-C  
{ j<?4N*S  
 UpdateData(); s:P-F0q!&  
 UCHAR mask=0; o*'3N/D~  
 UCHAR key=0; WU_Q 7%+QS  
 if(m_bControl) ep|u_|sB/r  
  mask|=4; 5]JXXdt  
 if(m_bAlt) DLZ63'  
  mask|=2; 6}2Lt[>O  
 if(m_bShift) omP 7|  
  mask|=1; 8/v_uEG  
  key=Key_Table[m_Key.GetCurSel()]; 2Y{9Df  
 if(bRegistered){ !>j- j  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); SfT]C~#$N  
  bRegistered=FALSE; 0IuU4h5Fr  
 } ly+7klQ;.  
 cMask=mask; B4=gMVp1  
 cKey=key; enM 3  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); (@9}FHJzi  
 return bRegistered; J( 60eTwQ  
} VF.S)='>Eu  
2=RDAipf59  
  四、小结 Jo]g{GX[  
n2~rrQ \/p  
  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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