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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: D+y?KihE  
  V/BU(`~i  
  一、实现方法 y7x*:xR[  
^.c<b_(=h  
  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: ef2)k4)"  
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#pragma data_seg("shareddata") gv,1 CK  
HHOOK hHook =NULL; //钩子句柄 Xn02p,,  
UINT nHookCount =0; //挂接的程序数目 _pxurq{  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 v^B2etiX_  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 6eb~Z6n&?  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey a#a n+JY3  
static int KeyCount =0; M2I*_pI  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 K94bM5O 1  
#pragma data_seg() ~~q>]4>  
(wf3HEb_  
  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。 %Z*N /nU  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: bu{dT8g'U  
xtut S  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR F>eo.|'  
cKey,UCHAR cMask) L~C:1VG5  
{ KxDp+]N]  
 BOOL bAdded=FALSE; A Wd,qldv  
 for(int index=0;index<MAX_KEY;index++){ nO#x "  
  if(hCallWnd[index]==0){ e-#V s{?|r  
   hCallWnd[index]=hWnd; /@&#U bN\  
   HotKey[index]=cKey; `><E J'h  
   HotKeyMask[index]=cMask; }s[`T   
   bAdded=TRUE; vRH2[{KQ9  
   KeyCount++; qB3E  
   break; *MQ`&;Qa,  
  } `1uGU[{x  
 } k"6&&  
 return bAdded; R?M>uaxn  
} L_o/fTz4  
//删除热键 =MT'e,T  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) XSGBC:U)l  
{ TX;)}\  
 BOOL bRemoved=FALSE; i8S=uJ]n  
 for(int index=0;index<MAX_KEY;index++){ J 5xMA-  
  if(hCallWnd[index]==hWnd){ 7C R6ew~  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ )?pnV":2Y  
    hCallWnd[index]=NULL; Pm,.[5uc  
    HotKey[index]=0; )sNPWn8<Uy  
    HotKeyMask[index]=0; =3!o _  
    bRemoved=TRUE; p$uPj*  
    KeyCount--; |(AFU3 ~  
    break; wJ7^)tTRF  
   } CD%Cb53  
  } \BN$WV  
 } r=~K#:66  
 return bRemoved; w*&vH/D  
} PQa0m)H@  
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1z4_QZZ.NG  
  DLL中的钩子函数如下: }r@yBUW  
'.M4yif \g  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) TiF+rA{t  
{ Ln t 1  
 BOOL bProcessed=FALSE; -/V(Z+dj  
 if(HC_ACTION==nCode) W6_ rSVm  
 { q7f`:P9~  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 c)B3g.C4m  
   switch(wParam) `lWGwFgg(  
   {  {it}\[3  
    case VK_MENU: q4&! mDU  
     MaskBits&=~ALTBIT; `[g$EXX  
     break; x,.=VB  
    case VK_CONTROL: aHmg!s}&  
     MaskBits&=~CTRLBIT; Q?1J<(oq9  
     break; @j_o CDS  
    case VK_SHIFT: ZTV)D  
     MaskBits&=~SHIFTBIT; m*A b<$y  
     break; Nr~!5XO  
    default: //judge the key and send message -0#"<!N  
     break; vI0,6fOd6  
   } wbrOL(q.m  
   for(int index=0;index<MAX_KEY;index++){ z k/`Uz  
    if(hCallWnd[index]==NULL) +pwTM]bV  
     continue; 7@%qm|i>w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) [n)ak)_/  
    { Zk((VZ(y  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); I9qFXvqL  
     bProcessed=TRUE; S.~L[iLc  
    } #e-K It  
   } |ugdl|f  
  } 3 0[Xkz  
  else if((lParam&0xc000ffff)==1){ //有键按下 {l,&F+W$C  
   switch(wParam) JCn HEH  
   { Gg9s.]W  
    case VK_MENU: R9R~$@~G  
     MaskBits|=ALTBIT; <Y7j'n  
     break; ^UJIDg7zS  
    case VK_CONTROL: f?tU5EX  
     MaskBits|=CTRLBIT; a<q9~QS  
     break; v)_c*+6u  
    case VK_SHIFT: s(3u\#P  
     MaskBits|=SHIFTBIT; Hq 5#.rZ#  
     break; =Pw{1m|k  
    default: //judge the key and send message #~nXAs]Q  
     break; [-VH%OM  
   } ;&=CZ6vH  
   for(int index=0;index<MAX_KEY;index++){ >y#MEN>?  
    if(hCallWnd[index]==NULL) / ^d9At614  
     continue; G<-KwGy,D  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9 nc_$H{  
    { j% 7Gje[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 2BT+[  
     bProcessed=TRUE; @W==)S%O  
    } sint":1FC  
   } /3sX>Rj  
  } eQ6wEeB9  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 PJ<qqA`!  
   for(int index=0;index<MAX_KEY;index++){ .*W7Z8!e  
    if(hCallWnd[index]==NULL) %uiCC>cC  
     continue; d{B0a1P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) /^X)>1)j  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); zp``e;gY  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 $gL^\(_3H  
   } nD!t*P  
  } Ev3,p`zS._  
 } 4VC8#x1  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); F9A5}/\  
} .VohW=D3  
VS_I'SPPIc  
  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: {L7+lz  
5Ux=5a  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 2NB $(4/  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); -*kZ2grLt  
7d+0'3%  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 'rVB2 `z-  
-av=5hm  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 1hc`s+N  
{ OXB 5W#$  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) k$kxw_N5d  
 { lc]cs D  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Xxj<Ai 2  
  SaveBmp(); XdnpL$0  
  return FALSE; %CUwD  
 } dh%DALZ8t  
 …… //其它处理及默认处理 6:?mz;oP  
} ZQ'|B  
 w U1[/  
c}H}fyu%n  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 #Kx @:I  
\c!e_rZ  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 RS@G.|  
uWP0(6 %  
  二、编程步骤 QB ;TQZ  
Mq#Hi9SKY  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; _@ g\.7@0G  
]Z52L`k  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; tGSX TF}G  
,-DU)&dF  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; I$XwM  
p1T0FBV L  
  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; ,jl4W+s  
|qU~({=b  
  5、 添加代码,编译运行程序。 7$8DMBqq  
7loWqZ  
三、程序代码 1 qp"D_h  
y'z9Ya  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Yjl:i*u/  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 6}Rb-\N  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 2Zg%4/u,Zp  
#if _MSC_VER > 1000 &!FI!T -WH  
#pragma once EEvi_Z932  
#endif // _MSC_VER > 1000 Ft_g~]kZo  
#ifndef __AFXWIN_H__ { 3 "jn  
#error include 'stdafx.h' before including this file for PCH i;:}{G<  
#endif |:`)sx3@#  
#include "resource.h" // main symbols ${97G#  
class CHookApp : public CWinApp C%/@U[;  
{ V3/OKI\o  
 public: 1\/~>  
  CHookApp(); AU;Iif6  
  // Overrides x@x5|8:ga  
  // ClassWizard generated virtual function overrides %Kh}6   
  //{{AFX_VIRTUAL(CHookApp) CM t$ )  
 public: z*o2jz?t4  
  virtual BOOL InitInstance(); bvT$/ (7  
  virtual int ExitInstance(); `u8(qGg7GF  
  //}}AFX_VIRTUAL r'@7aT&_  
  //{{AFX_MSG(CHookApp) bKh}Y`  
  // NOTE - the ClassWizard will add and remove member functions here. ft!D2M  
  // DO NOT EDIT what you see in these blocks of generated code ! x@|10GC#:  
  //}}AFX_MSG )[=C@U  
  DECLARE_MESSAGE_MAP() {l\Ep=O vx  
}; -:Q"aeC5  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); N_(-\\mq  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); VuH }@  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); tn|H~iF{  
BOOL InitHotkey(); zJOyr"B'8  
BOOL UnInit(); drp< f1`l8  
#endif qporH]J-E  
}xgs]\^,73  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.  7uzc1}r  
#include "stdafx.h" :aD_>,n  
#include "hook.h" <co:z<^lqu  
#include <windowsx.h> ~Yre(8+M  
#ifdef _DEBUG 2=| Ks]<P  
#define new DEBUG_NEW HYNpvK  
#undef THIS_FILE qI[AsM+  
static char THIS_FILE[] = __FILE__; O1oh,~W  
#endif 6g)CpZU  
#define MAX_KEY 100 w(Q{;RNM;  
#define CTRLBIT 0x04 SOS|3q_`  
#define ALTBIT 0x02 ]oKHS$W9  
#define SHIFTBIT 0x01 :GM3n$  
#pragma data_seg("shareddata") *(sv5c!0M8  
HHOOK hHook =NULL; OZe`>Q6  
UINT nHookCount =0; +t(Gt0+  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey $$'[ %  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT i~m;Ah,#  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey d 0:;IUG  
static int KeyCount =0; TR:4$92:H  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 4u1au1c  
#pragma data_seg() Kw`}hSE>o  
HINSTANCE hins; #_:%Y d  
void VerifyWindow(); d;).| .}P  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) = @ 1{LF;  
//{{AFX_MSG_MAP(CHookApp) r$,Xv+}  
// NOTE - the ClassWizard will add and remove mapping macros here. g,f AV M  
// DO NOT EDIT what you see in these blocks of generated code! &p55Cg@e)  
//}}AFX_MSG_MAP 1:q`KkJx  
END_MESSAGE_MAP() )c.!3n/pb  
mwF{z.t"  
CHookApp::CHookApp() nMBF/75  
{ yY"n:&T(  
 // TODO: add construction code here, D+Z2y1  
 // Place all significant initialization in InitInstance I@(3~ Ab  
} 26=G%F6  
"?'9\<>  
CHookApp theApp; SjvSnb_3  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) caL \ d  
{ $]J<^{v  
 BOOL bProcessed=FALSE; L!Gpk)}[i  
 if(HC_ACTION==nCode) nlc$"(eA[H  
 { ^a7a_M  
  if((lParam&0xc0000000)==0xc0000000){// Key up kXO c)  
   switch(wParam) lXutZ<S[  
   { M'@  
    case VK_MENU: 4!-/m7%eF  
     MaskBits&=~ALTBIT; ah#jvp  
     break; @/='BVb'T  
    case VK_CONTROL: BoHNni  
     MaskBits&=~CTRLBIT; , Q)  
     break; $ou/ Fn  
    case VK_SHIFT: I.U=%{.  
     MaskBits&=~SHIFTBIT; NH+N+4dEO  
     break; ,2mq}u>WU  
    default: //judge the key and send message `KieN/d%  
     break; X#ud_+6x  
   } 8k^1:gt^  
   for(int index=0;index<MAX_KEY;index++){ r<DPh5ReY  
    if(hCallWnd[index]==NULL) =0>[-:Z  
     continue; k8,s<m  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _D8:p>=  
    { <'~6L#>,<  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); O:#/To'  
     bProcessed=TRUE; !z]{zM%  
    } 5YXMnYt9  
   } M`?ATmYy  
  } CJ6vS  
  else if((lParam&0xc000ffff)==1){ //Key down tQ)l4Y 8  
   switch(wParam) %Ybr5$_  
   { 8TYoa:pZ  
    case VK_MENU: b6@0?_n  
     MaskBits|=ALTBIT; 5L,q,kVS  
     break; ~oRT@E  
    case VK_CONTROL: wif1|!aL  
     MaskBits|=CTRLBIT; _!%@V=  
     break; R[H#a v  
    case VK_SHIFT: ?]>;Wr  
     MaskBits|=SHIFTBIT; R_#k^P^  
     break; ,n$HTWa@0  
    default: //judge the key and send message 9<5ii  
     break; h#u k-7  
   } Cm-dos  
   for(int index=0;index<MAX_KEY;index++) *\^(-p~M  
   { DOq"=R+  
    if(hCallWnd[index]==NULL) 'N/u< `)  
     continue; LqS_%6^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) +<WNAmh   
    { m21H68y  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); v=-T3 n  
     bProcessed=TRUE; ePTxuCf>  
    } "}:SXAZ5`  
   } 4"Mq]_D  
  } ilQt`-O!  
  if(!bProcessed){ !Za yN  
   for(int index=0;index<MAX_KEY;index++){ M?I^`6IOc8  
    if(hCallWnd[index]==NULL) l2kUa'O-  
     continue; u3IhB8'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) LPkl16yZ  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ^[b DE0  
   } 1/c+ug!y  
  } i.e4<|{  
 } 6Z{(.'Be  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); [!`5kI  
} {}BAQ9|q  
o>HGfr,N  
BOOL InitHotkey() lO HW9Z  
{ i~rb-~o  
 if(hHook!=NULL){ |]b,% ?,U  
  nHookCount++; T2|os{U  
  return TRUE; X=Jt4 h 9  
 } T[2<_nn=  
 else sk@aOv'*(  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); d"thM  
  if(hHook!=NULL) nY,LQ0r  
   nHookCount++; m,ur{B8 :  
  return (hHook!=NULL); o 80x@ &A:  
} {HjJ9ZGQ  
BOOL UnInit() c!mMH~#  
{ WnA Y<hZ|  
 if(nHookCount>1){ =Ea,8bpn  
  nHookCount--; {8,_[?H  
  return TRUE; Pav  
 } c,#Nd@  
 BOOL unhooked = UnhookWindowsHookEx(hHook); w4l]rH  
 if(unhooked==TRUE){ 4|DN^F~iut  
  nHookCount=0; JY3!jtv  
  hHook=NULL; n D}<zj$D2  
 } !wKiMgLS  
 return unhooked; h7AO5"6  
} {a(<E8-^  
kB=5=#s  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) %Lq}5zB  
{ olK*uD'`  
 BOOL bAdded=FALSE; (R(NEN  
 for(int index=0;index<MAX_KEY;index++){ Bk5ft4v-  
  if(hCallWnd[index]==0){ i*mI-l  
   hCallWnd[index]=hWnd; Q+Eqaz`  
   HotKey[index]=cKey; #r]GnC,  
   HotKeyMask[index]=cMask; Yx](3w ID  
   bAdded=TRUE; <80M$a g  
   KeyCount++; jRxzZt4  
   break; jJ?G7Q5 l  
  } |RDE/  
 } K] &GSro  
 return bAdded; lE3&8~2   
} 7r pTk&`  
sR| /s3;  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) biVsbxYurq  
{ 4+4&}8FH  
 BOOL bRemoved=FALSE; X"%eRW&qu/  
 for(int index=0;index<MAX_KEY;index++){ ^b*ub(5Ot  
  if(hCallWnd[index]==hWnd){ E cd~H+  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ rK4 pYo  
    hCallWnd[index]=NULL; ?S.LGc  
    HotKey[index]=0; ~xc0Ky?8  
    HotKeyMask[index]=0; ~!_UDD  
    bRemoved=TRUE; 5"D\n B%  
    KeyCount--; Ah zV?6e  
    break; B&}lYo  
   } 5,R<9FjW  
  } ""jl  
 } RI BB*  
 return bRemoved; ='(;!3ZH  
} Z*'_/Grv?  
\*c=bz&l  
void VerifyWindow() oB+@05m8  
{ mQ\oR|  
 for(int i=0;i<MAX_KEY;i++){ M*F`s& vM  
  if(hCallWnd!=NULL){ ,MD >Jx|  
   if(!IsWindow(hCallWnd)){ YwJ<0;:+hS  
    hCallWnd=NULL; @>[3 [;  
    HotKey=0; `_M&zN  
    HotKeyMask=0; @oFuX.  
    KeyCount--; `~LaiN.  
   } Fw6x (j"  
  } pbqJtBBDDS  
 } 3L;&MG=  
} E D_J8 +  
{-s7_\|p(  
BOOL CHookApp::InitInstance() E\~!E20^  
{ - [7S.  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); h>n<5{zqM  
 hins=AfxGetInstanceHandle(); >8DZj&j  
 InitHotkey(); AHTQF#U^  
 return CWinApp::InitInstance(); 200Fd8Ju  
} S&~;l/  
@|9V]bk  
int CHookApp::ExitInstance() 7XiR)jYo*  
{ G88g@Exk  
 VerifyWindow(); -}Gk@=$G  
 UnInit(); y-vB C3  
 return CWinApp::ExitInstance(); ;3N>m| ?D=  
} m H&WoL<K  
-[>G@m:?e  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file FdmoR;  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) )>WSuf j  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ %<'PSri  
#if _MSC_VER > 1000 B6]M\4v  
#pragma once y3mJO[U0 a  
#endif // _MSC_VER > 1000 9 X87"  
yv.(Oy  
class CCaptureDlg : public CDialog QCvst*  
{ P!lTK   
 // Construction hgF4PdO1e  
 public: Rm=[Sj84  
  BOOL bTray; %2rUJaOgy$  
  BOOL bRegistered; t0o'_>*?A  
  BOOL RegisterHotkey(); ,F0bkNBG  
  UCHAR cKey; /PtmJ2 [  
  UCHAR cMask; <,(Ww   
  void DeleteIcon(); yyu f  
  void AddIcon(); OeY+Yt0  
  UINT nCount; ?L6ACi`9  
  void SaveBmp(); qeoj  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor "z ;ky8  
  // Dialog Data "?Xb$V7  
  //{{AFX_DATA(CCaptureDlg) yI}_ U  
  enum { IDD = IDD_CAPTURE_DIALOG }; +L<x0-&  
  CComboBox m_Key; ;NrU|g/ksX  
  BOOL m_bControl; l|~SVk|  
  BOOL m_bAlt; -hpMd/F  
  BOOL m_bShift; 1$rrfg  
  CString m_Path; 7Dwf0Re`  
  CString m_Number; ~b SjZ1`  
  //}}AFX_DATA X5Ff2@."y|  
  // ClassWizard generated virtual function overrides #wZBWTj.  
  //{{AFX_VIRTUAL(CCaptureDlg) J l9w/T  
 public: e(sV4Z~  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ;PG,0R`Z;  
 protected: ~0XV[$`L  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support j?9fb  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); bY7~b/  
  //}}AFX_VIRTUAL ^1w*$5YI  
  // Implementation @P}!mdH1  
 protected: s4Y7x.-  
  HICON m_hIcon; BJ7m3[lz  
  // Generated message map functions &&{_T4  
  //{{AFX_MSG(CCaptureDlg) [[9XqD]  
  virtual BOOL OnInitDialog(); mRC6m K>  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Zk75GC  
  afx_msg void OnPaint(); ,[0rh%%j  
  afx_msg HCURSOR OnQueryDragIcon(); <{b#nPc!,#  
  virtual void OnCancel(); IBe0?F #  
  afx_msg void OnAbout(); 334tg'2]  
  afx_msg void OnBrowse(); 00(#_($  
  afx_msg void OnChange(); 5_ioJ   
 //}}AFX_MSG p}R3A J  
 DECLARE_MESSAGE_MAP() qox31pnS  
}; CNF3".a  
#endif L;s,xV  
{!rpE7P-  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file -R-|[xN  
#include "stdafx.h" G Za<  
#include "Capture.h" b".e6zev  
#include "CaptureDlg.h" WF0[/Y  
#include <windowsx.h> A('_.J=  
#pragma comment(lib,"hook.lib") O*zF` 9  
#ifdef _DEBUG fA>FU/r  
#define new DEBUG_NEW *ioVLt,:R  
#undef THIS_FILE j9Y'HU5"  
static char THIS_FILE[] = __FILE__; &DgJu.  
#endif qC aM]Y  
#define IDM_SHELL WM_USER+1 kan4P@XVS  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); m6=Jp<  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); =ADdfuKN  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ^`XTs!.  
class CAboutDlg : public CDialog k+FiW3-  
{ *yxn*B_xZ  
 public: ;iMgv5=  
  CAboutDlg(); El)WjcmH  
  // Dialog Data G*lkVQ6?  
  //{{AFX_DATA(CAboutDlg) YjM_8@ <  
  enum { IDD = IDD_ABOUTBOX }; C%y!)v_x  
  //}}AFX_DATA QL4BD93v  
  // ClassWizard generated virtual function overrides #b?)fqRJL  
  //{{AFX_VIRTUAL(CAboutDlg) jsrIZbN  
 protected: 9!06R-h  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support t*'U|K4L/  
  //}}AFX_VIRTUAL  M} {'kK  
  // Implementation 3\jcq@N  
 protected: 2XN];,{  
  //{{AFX_MSG(CAboutDlg) [Q=NGHB1/  
  //}}AFX_MSG yj48GQP]  
  DECLARE_MESSAGE_MAP() *j0kb"#  
}; 1hQeuG  
z sZP\  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) lrXi *u]  
{ C/{tvY /o  
 //{{AFX_DATA_INIT(CAboutDlg) C;&44cU/]  
 //}}AFX_DATA_INIT &b#O=LF  
} >pV|c\  
j5yxdjx9  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) `V1D &}H+G  
{ DfNX@gbo  
 CDialog::DoDataExchange(pDX); wwtk6;8@  
 //{{AFX_DATA_MAP(CAboutDlg) </OZ,3J=  
 //}}AFX_DATA_MAP 0WjPo  
} 85Hb~|0  
' N@1+v=  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) itmdY!;<  
 //{{AFX_MSG_MAP(CAboutDlg) c9 UJ=  
 // No message handlers *Q@%< R  
 //}}AFX_MSG_MAP :i4>&4j  
END_MESSAGE_MAP() Gg3cY{7  
A\jX#gg  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) xgi/,Nk '  
: CDialog(CCaptureDlg::IDD, pParent) `n# {}%  
{ $1h,<$5H  
 //{{AFX_DATA_INIT(CCaptureDlg) ;&N;6V"}  
  m_bControl = FALSE; cG"+n@ \  
  m_bAlt = FALSE; q DQ$Zq[  
  m_bShift = FALSE; (>E 70|T  
  m_Path = _T("c:\\"); V _&>0P{q  
  m_Number = _T("0 picture captured."); %b H1We  
  nCount=0; xt%-<%s%f  
  bRegistered=FALSE; L %[om c?  
  bTray=FALSE; CCp8,  
 //}}AFX_DATA_INIT g?'4G$M  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 W+&w'~M  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); yJ(p-3O5  
} i U^tv_1  
n6PXPc  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Wn(pz)+Y  
{ [,Io!O  
 CDialog::DoDataExchange(pDX); q&h&GZ  
 //{{AFX_DATA_MAP(CCaptureDlg) Wgt[ACioN  
  DDX_Control(pDX, IDC_KEY, m_Key); 6w d0"  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 5AWIk,[  
  DDX_Check(pDX, IDC_ALT, m_bAlt); A{5^A)$  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 0u]!C"VX  
  DDX_Text(pDX, IDC_PATH, m_Path); <$^76=x,8P  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 1]L 0r  
 //}}AFX_DATA_MAP =AhXEu^  
} r*|#*"K"a  
`g2DN#q[0  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) _]~gp.  
//{{AFX_MSG_MAP(CCaptureDlg) Hoaf3 `n  
 ON_WM_SYSCOMMAND() M(l>^N8W8  
 ON_WM_PAINT() @O7hY8",  
 ON_WM_QUERYDRAGICON() %<|w:z$vp  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) *(%]|z}]m  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) U*.Wx0QM  
 ON_BN_CLICKED(ID_CHANGE, OnChange) hJavi>374  
//}}AFX_MSG_MAP %1uY  
END_MESSAGE_MAP() XY[uyR4Z  
2qY`*Y.2  
BOOL CCaptureDlg::OnInitDialog() "T`Q,  
{ eIz T(3(  
 CDialog::OnInitDialog(); de?Bn+mvi.  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); S H"e x,=  
 ASSERT(IDM_ABOUTBOX < 0xF000); j4v.8;  
 CMenu* pSysMenu = GetSystemMenu(FALSE); WUQlAsme  
 if (pSysMenu != NULL) !ejLqb  
 { oUMY?[Wp  
  CString strAboutMenu; n+db#qAj5  
  strAboutMenu.LoadString(IDS_ABOUTBOX); UN7>c0B  
  if (!strAboutMenu.IsEmpty()) 1gEeZ\B-&  
  { TA=VfA B  
   pSysMenu->AppendMenu(MF_SEPARATOR); .w/_Om4T*b  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); lx8@;9fLy  
  } 50 :gk*hy  
 } uqaP\  
 SetIcon(m_hIcon, TRUE); // Set big icon +I$ k_  
 SetIcon(m_hIcon, FALSE); // Set small icon YQb43Sh`  
 m_Key.SetCurSel(0); |Co ?uv i  
 RegisterHotkey(); :wn9bCom?M  
 CMenu* pMenu=GetSystemMenu(FALSE); }<y-`WB  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Nwu,:}T  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); d4Y8q1  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Q`nsL)J  
 return TRUE; // return TRUE unless you set the focus to a control Xx~za{p  
} bLrC_  
=-XI)JV#  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) !,f{I5/  
{ j]uL 9\>  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 3<ikMUq&  
 { {H FF|Dx  
  CAboutDlg dlgAbout; ]?n)!u  
  dlgAbout.DoModal(); jmgU'w-s  
 } V87?J w%2  
 else ku=o$I8K  
 { AV"fOK;#A  
  CDialog::OnSysCommand(nID, lParam); \ /(;LHWQ  
 } P`JO6O:&  
} R5iv]8X4W  
*=OU~68)C  
void CCaptureDlg::OnPaint() N# o" W  
{ *#O8 ^3D_c  
 if (IsIconic()) 9>y6zFTV  
 { 6#egy|("nF  
  CPaintDC dc(this); // device context for painting vYT%e:8)q  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); cVHv>nd#  
  // Center icon in client rectangle Ij+ E/V  
  int cxIcon = GetSystemMetrics(SM_CXICON); 4CR.=  
  int cyIcon = GetSystemMetrics(SM_CYICON); V2< 4~J2:9  
  CRect rect; H5@N<v5 u  
  GetClientRect(&rect); wYxnKm~f  
  int x = (rect.Width() - cxIcon + 1) / 2; +}IOTw" O`  
  int y = (rect.Height() - cyIcon + 1) / 2; *h=|KOS  
  // Draw the icon gv7(-I  
  dc.DrawIcon(x, y, m_hIcon); >EQd;Af  
 } U#=Q`  
 else h^{D "  
 { eGZ{%\PH<  
  CDialog::OnPaint(); vA(V.s`  
 } x.Sq2rw]V  
} iHKWz)0  
y:TLGQ0  
HCURSOR CCaptureDlg::OnQueryDragIcon() {-28%  
{ ,j{$SuZ M  
 return (HCURSOR) m_hIcon; 3*13XQ  
} |Gc2w]\3  
V~rF`1+5N  
void CCaptureDlg::OnCancel() 0~qnwe[g}  
{ . }QR~IR'  
 if(bTray) <"|BuK  
  DeleteIcon(); /UG H7srx  
  CDialog::OnCancel(); Iu`B7UOF  
} (+' *_   
/IDfGAE  
void CCaptureDlg::OnAbout() 3Lx]-0h  
{ N O|&nqq,>  
 CAboutDlg dlg; a0y7a/@c  
 dlg.DoModal(); ^P&)2m:s  
} OSc&n>\t  
86J7%;^Xa  
void CCaptureDlg::OnBrowse() IaDc hI  
{ W(N@`^  
 CString str; wy3{>A Z(  
 BROWSEINFO bi; {}ks[%,_\  
 char name[MAX_PATH]; ;IX3w:Aw  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); g0-hN%=6  
 bi.hwndOwner=GetSafeHwnd(); rf.w}B;V;  
 bi.pszDisplayName=name; MqXN,n+`k  
 bi.lpszTitle="Select folder"; Jq1 Zb  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; m09 Bds  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); eJ0PSW/4l  
 if(idl==NULL) Rg! [ic !  
  return; 0*?~I;.2m$  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 9N^&~O|1  
 str.ReleaseBuffer(); oWGtKtDhH  
 m_Path=str; .%>UA|[~:  
 if(str.GetAt(str.GetLength()-1)!='\\') LO8V*H(  
  m_Path+="\\"; X^4HYm  
 UpdateData(FALSE); ~fLuys`*:  
} n m4+$GW   
/YYI 4  
void CCaptureDlg::SaveBmp() 2T!pFcc  
{ qG.HJD  
 CDC dc; X)iQ){21V  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); |}paa  
 CBitmap bm; b!VaEK  
 int Width=GetSystemMetrics(SM_CXSCREEN); =\7o@ 38  
 int Height=GetSystemMetrics(SM_CYSCREEN); TqK`X#Zq  
 bm.CreateCompatibleBitmap(&dc,Width,Height); !K;\{/8  
 CDC tdc; +rS}f N$L.  
 tdc.CreateCompatibleDC(&dc); X&sXss<fO%  
 CBitmap*pOld=tdc.SelectObject(&bm); ,yW BO  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); yLFc?{~7  
 tdc.SelectObject(pOld); Dpp 3]en.  
 BITMAP btm; F/z$jj)  
 bm.GetBitmap(&btm); Htn'(Q  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; B,?Fjot#m  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); |5|^[v   
 BITMAPINFOHEADER bih; WoGK05w  
 bih.biBitCount=btm.bmBitsPixel; BH _y0[y  
 bih.biClrImportant=0; e R"XXF0u  
 bih.biClrUsed=0; 6v7H?4  
 bih.biCompression=0; !l!^`c  
 bih.biHeight=btm.bmHeight; ncS.~F  
 bih.biPlanes=1; VXEA.Mko  
 bih.biSize=sizeof(BITMAPINFOHEADER); {B$cd?}  
 bih.biSizeImage=size; ]37k\O?vd  
 bih.biWidth=btm.bmWidth; [v$_BS#u^3  
 bih.biXPelsPerMeter=0; EacqQFErl  
 bih.biYPelsPerMeter=0; $P#Cf&R  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); .`4N#EjP  
 static int filecount=0; QA_SS'*  
 CString name; /5M@>A^?'  
 name.Format("pict%04d.bmp",filecount++); 9An_zrJ%i  
 name=m_Path+name; :<Z*WoEmt  
 BITMAPFILEHEADER bfh; (3z: ;  
 bfh.bfReserved1=bfh.bfReserved2=0; W70J2  
 bfh.bfType=((WORD)('M'<< 8)|'B'); -N`j` zb|  
 bfh.bfSize=54+size; b Z c&uq_  
 bfh.bfOffBits=54; p-n_ ">7  
 CFile bf; ~@=:I  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ [OJ@{{U%  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); oL0Q%_9hW  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ?Pz:H/ $  
  bf.WriteHuge(lpData,size); @=ABO"CQ  
  bf.Close(); Kl.xe&t@j  
  nCount++; \zA$|) x  
 } cQDn_Sjhi  
 GlobalFreePtr(lpData); b%>vhj&F  
 if(nCount==1) \.p{~ Hv  
  m_Number.Format("%d picture captured.",nCount); I=)Hb?q T~  
 else KZ%us6  
  m_Number.Format("%d pictures captured.",nCount); hQ!59  
  UpdateData(FALSE); $+ N~Fa  
} O9o]4;  
 +Mhk<A[s  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 6O.kKhk  
{ ~Hv>^u Mh  
 if(pMsg -> message == WM_KEYDOWN) >Yk|(!v  
 { w)RedJnf  
  if(pMsg -> wParam == VK_ESCAPE) rly%+B `/  
   return TRUE; r>i95u82'  
  if(pMsg -> wParam == VK_RETURN) ZZHzC+O#^  
   return TRUE; l?rLadvc  
 } 4\p%|G^hU  
 return CDialog::PreTranslateMessage(pMsg); 8O(L;&h  
} <1Sj_HCT  
'6e4rn{  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) H?M:<q0|G  
{ K/*"U*9Kv  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ sLJ]N0t  
  SaveBmp(); rIYO(}Fl  
  return FALSE; surNJ,)  
} ^);M}~  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ =<m!% /I  
 CMenu pop; V9qA'k  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); {^(uoB C/  
 CMenu*pMenu=pop.GetSubMenu(0); Fj2z$   
 pMenu->SetDefaultItem(ID_EXITICON); G!=(^G@J;  
 CPoint pt; $w <R".4  
 GetCursorPos(&pt); {X{S[(|  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 44B D2`nF  
 if(id==ID_EXITICON) $F9w0kz:,*  
  DeleteIcon(); XzX2V">(%  
 else if(id==ID_EXIT) mCk_c  
  OnCancel(); ;~djbo0,X  
 return FALSE; ~o|sma5.  
} DTM(SN8R+n  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); G3+e5/0  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 5}Ge  
 AddIcon(); ~<O.Gu&"R  
 return res; &"gX 7cK8  
} xgj'um  
(|o @  
void CCaptureDlg::AddIcon() +HRtuRv0T  
{ (Cq 38~mR  
 NOTIFYICONDATA data; ?I? ~BWu  
 data.cbSize=sizeof(NOTIFYICONDATA); +;,J0,Yn  
 CString tip; }vx,i99W?  
 tip.LoadString(IDS_ICONTIP); DO-M0L  
 data.hIcon=GetIcon(0); .m8l\h^3  
 data.hWnd=GetSafeHwnd(); @NL<v-t  
 strcpy(data.szTip,tip); B[EOz\?=m  
 data.uCallbackMessage=IDM_SHELL; &{glwVKV  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; DbB<8$  
 data.uID=98; '%ZKvZ-  
 Shell_NotifyIcon(NIM_ADD,&data); bV2a2#kj  
 ShowWindow(SW_HIDE); Rr CG(Bh  
 bTray=TRUE; \o2l;1~  
} SSla^,MHef  
.E+O,@?<  
void CCaptureDlg::DeleteIcon() w/*#TDR  
{ mbX'*up  
 NOTIFYICONDATA data; ni2 [K`  
 data.cbSize=sizeof(NOTIFYICONDATA); :=+YZ|&j  
 data.hWnd=GetSafeHwnd(); ||TZ[l  
 data.uID=98; I~YV&12  
 Shell_NotifyIcon(NIM_DELETE,&data); d*04[5`  
 ShowWindow(SW_SHOW); /U!B2%vq_  
 SetForegroundWindow(); ;Gn>W+Ae M  
 ShowWindow(SW_SHOWNORMAL); WHOy\j},V  
 bTray=FALSE; nsXG@CS:  
} O`%F{&;29  
lDKyD`WKnZ  
void CCaptureDlg::OnChange() &nVekE:!  
{ ,ZrR*W?iF  
 RegisterHotkey(); C{nk,j L  
} 3)o>sp)Ji$  
3]lq#p:  
BOOL CCaptureDlg::RegisterHotkey() ??P\v0E  
{ qa@;S,lp  
 UpdateData(); +_*NY~  
 UCHAR mask=0; F @Wi[K  
 UCHAR key=0; Wtk|}>Pf  
 if(m_bControl) LE5N2k  
  mask|=4; =?+w5oI0  
 if(m_bAlt) NKB["+S<  
  mask|=2; rr(kFQ"  
 if(m_bShift) AX6:*aZB  
  mask|=1; :6)!#q'g  
  key=Key_Table[m_Key.GetCurSel()]; >Je$WE3  
 if(bRegistered){ Ei+lVLoC  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); sGNHA( ;  
  bRegistered=FALSE; et/l7+/'  
 } NYg&8s.  
 cMask=mask;  lFcHE c  
 cKey=key; l*w'  O  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); j"TEp$x  
 return bRegistered; ,|?#+O{  
} F=*t]X[z}  
>0 o[@gJl  
  四、小结 :2NV;7Wke6  
IUh9skW5  
  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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