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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: ffGiNXCM  
  4|fI9.  
  一、实现方法 MVV9[f  
A7.$soI\  
  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: \NbMSC&H  
6Lw34R  
#pragma data_seg("shareddata") WU-.lg'c'  
HHOOK hHook =NULL; //钩子句柄 kV7c\|N9  
UINT nHookCount =0; //挂接的程序数目 &3VR)Bxn  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 o.5w>l!9K  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 sL;qC\S  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Bb];qYuCO  
static int KeyCount =0; -#v1b>ScY  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 =@b/Gl  
#pragma data_seg() >^%]F[Wo  
%WrUu|xj>_  
  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。 < J=9,tv<  
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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: rlYAy5&  
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BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR C=}YKsi|R|  
cKey,UCHAR cMask) u"-q"0  
{ *]%{ttR~  
 BOOL bAdded=FALSE; ]zHUF!a*  
 for(int index=0;index<MAX_KEY;index++){ x$9UHEb kM  
  if(hCallWnd[index]==0){ *a xOen  
   hCallWnd[index]=hWnd; H kDT14 `&  
   HotKey[index]=cKey; r8XY"<  
   HotKeyMask[index]=cMask; 50Z$3T  
   bAdded=TRUE; n~ \"W  
   KeyCount++; BnH< -n_  
   break; ?DEj| i8  
  } ml 7]s N(  
 } EBS04]5ul  
 return bAdded; EzK,SN#  
} RE`XyS0Q  
//删除热键 <!^wGN$f  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ^- T!(P:  
{ IbQ3*  
 BOOL bRemoved=FALSE; ~4o2!!^tI  
 for(int index=0;index<MAX_KEY;index++){ <Yfk7Un  
  if(hCallWnd[index]==hWnd){ XA} !  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ']1j M n  
    hCallWnd[index]=NULL; )'(7E$d  
    HotKey[index]=0; %fMK^H8{  
    HotKeyMask[index]=0; JB(~O`  
    bRemoved=TRUE; A?8f 6  
    KeyCount--; _wp6rb:8!  
    break; zN JK+_O=  
   } xqv4gN6  
  } siw } }}  
 } > Zo_-,  
 return bRemoved; -Cv:lJj  
} g*Nc+W](P>  
t{tcy$bw  
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  DLL中的钩子函数如下: ,EW-21  
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LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) zC6,m6Dv  
{ MIasCH>r  
 BOOL bProcessed=FALSE; {ScilT  
 if(HC_ACTION==nCode) tG(?PmQ  
 { z c N1i^   
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 EY;C5P4  
   switch(wParam) yWsV !Ub  
   {  1Qui.],c  
    case VK_MENU: PiXegh WH  
     MaskBits&=~ALTBIT; kL,bM.;  
     break; |XOD~Plo^  
    case VK_CONTROL: cP63q|[[  
     MaskBits&=~CTRLBIT; W!4(EdT*Cq  
     break; l'T3RC,\  
    case VK_SHIFT: oEvXZ;F@.  
     MaskBits&=~SHIFTBIT; Q PgM<ns  
     break; :P<} bGN  
    default: //judge the key and send message m&jh7)V  
     break; Y~(#_K  
   } U'@eUY(Ov$  
   for(int index=0;index<MAX_KEY;index++){ y ?]G OQI  
    if(hCallWnd[index]==NULL) 8r(S=dA  
     continue; DSad[>Uj],  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) xJrRJwL  
    { 61>@-55k9  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); oe,L&2Jz@  
     bProcessed=TRUE; Ej>5PXp'2  
    } l'HrU 1_7Y  
   } gJ cf~@s  
  } }5-^:}gL   
  else if((lParam&0xc000ffff)==1){ //有键按下 jSp4eq  
   switch(wParam) d:}aFP[  
   { /10 I}3D  
    case VK_MENU: \Fj$^I>C  
     MaskBits|=ALTBIT; L,V\g^4$K  
     break; <Hl.MS  
    case VK_CONTROL: v.H00}[.  
     MaskBits|=CTRLBIT; ,  A?o  
     break; wmdvAMN  
    case VK_SHIFT: udM<jY]5p  
     MaskBits|=SHIFTBIT; XZhuV<  
     break; iZ2|/hnw  
    default: //judge the key and send message &S9Sl  
     break; 9cud CF  
   } zz3Rld!b[  
   for(int index=0;index<MAX_KEY;index++){ _3-nw  
    if(hCallWnd[index]==NULL) V6Ie\+@.\  
     continue; U`sybtuBP'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) VU`aH9g3(  
    { ykc$B5*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); tK{2'e6x  
     bProcessed=TRUE; !7t,(Id8  
    } ]}H;`H  
   } 4.2qt  
  } <<!XWV*m  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 pJ-/"Q|:i  
   for(int index=0;index<MAX_KEY;index++){ z(L\I  
    if(hCallWnd[index]==NULL) [3h~y7  
     continue; 6=a($s!   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 26un=  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 0@z=0}0Z  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 w%;Z`Xn&u  
   } }@Lbv aa  
  } vUh.ev0  
 } k]W~_  
 return CallNextHookEx( hHook, nCode, wParam, lParam );  *e{d^  
} 67Rsd2   
% FW__SN$c  
  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: +[@Ug`5M  
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BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ,":_=Tf.  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); $ KQ7S>T  
=FUORj\O  
  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: i{TErJ{}e  
"?a(JC  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Rdao  
{ Es<id}`  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 5-l cz)DO  
 { J&4LyIpQ  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 +ew2+2  
  SaveBmp(); S*~v9+  
  return FALSE; G m40u/  
 } l@7X gsey  
 …… //其它处理及默认处理 SFAh(+t  
} 8t3@ Hi  
pn?c6K vO  
10xo<@l  
  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。 kuq3QW<  
o!EPF-:  
  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。 Qa~dd{?  
3lYM(DT  
  二、编程步骤 N}Ozm6Mc  
+~mBo+ ,  
  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"; l}B,SkP^  
2ijw g~_@  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; !/O c)Yk  
'zV/4iE=  
  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; j;@7V4'  
l<0 BMwS8  
  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; LQ pUyqR  
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  5、 添加代码,编译运行程序。 99 /fI  
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三、程序代码 6?OH"!b2-}  
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///////////////////////////////////// Hook.h : main header file for the HOOK DLL GPnd7}Tn  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) HT7V} UiaO  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ C(7uvQ  
#if _MSC_VER > 1000 xb$eFiQ  
#pragma once |mvy@hm  
#endif // _MSC_VER > 1000 Un\h[m  
#ifndef __AFXWIN_H__ /Y|oDfv  
#error include 'stdafx.h' before including this file for PCH tkU"/$Vi\  
#endif QHnk@ R!  
#include "resource.h" // main symbols -ZqN~5>j)  
class CHookApp : public CWinApp *fVs|  
{ ~yz7/?A)TS  
 public: -#T?C ]}  
  CHookApp(); I;kKY  
  // Overrides is_`UDaB  
  // ClassWizard generated virtual function overrides f.rc~UI?  
  //{{AFX_VIRTUAL(CHookApp) qYLOq `<f  
 public: 44_7gOZ  
  virtual BOOL InitInstance(); bj^YB,iSM  
  virtual int ExitInstance(); z OkUR9  
  //}}AFX_VIRTUAL tj@IrwC^e"  
  //{{AFX_MSG(CHookApp) 5at\!17TY  
  // NOTE - the ClassWizard will add and remove member functions here. ;i|V++$_  
  // DO NOT EDIT what you see in these blocks of generated code ! 6Ouy%]0$I3  
  //}}AFX_MSG ._JM3o}F  
  DECLARE_MESSAGE_MAP() ZZqImB.Cz6  
}; )u~LzE]{_  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Xao 0cb.R  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); s>Xx:h6m  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {'P7D4w  
BOOL InitHotkey(); H: q(T >/w  
BOOL UnInit(); dE9xan  
#endif N9IBw',  
WF#eqU*&  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ka3Jqy4[  
#include "stdafx.h" sS#Lnj^`%  
#include "hook.h" ;\yY*  
#include <windowsx.h> > E;`;b  
#ifdef _DEBUG Wi]Mp7b  
#define new DEBUG_NEW R:HF~}  
#undef THIS_FILE cd,)GF  
static char THIS_FILE[] = __FILE__; s\g"~2+  
#endif gd3~R+Kd  
#define MAX_KEY 100 `ro~l_U;A  
#define CTRLBIT 0x04 ~ldqg2c  
#define ALTBIT 0x02 xv;'27mUt  
#define SHIFTBIT 0x01 7kapa59  
#pragma data_seg("shareddata") v#i,pBj  
HHOOK hHook =NULL; 2OFrv=F  
UINT nHookCount =0; 3]Rb2$p[=  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey J{c-'Of2yi  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT `[x`#irD  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey LO{{3No  
static int KeyCount =0; xKIzEN &  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift "F%w{bf  
#pragma data_seg() ta\AiHm  
HINSTANCE hins; _/0vmgQ&  
void VerifyWindow(); !U38aHG  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) &x$1hx'  
//{{AFX_MSG_MAP(CHookApp) @KRr$k  
// NOTE - the ClassWizard will add and remove mapping macros here. .T0w2Dv/  
// DO NOT EDIT what you see in these blocks of generated code! Stqlp<xy  
//}}AFX_MSG_MAP "i/ l'  
END_MESSAGE_MAP() Oi# F  
xu[6h?u(h8  
CHookApp::CHookApp() 8/cD7O  
{ Y(QLlJ*)/  
 // TODO: add construction code here, NU>={9!  
 // Place all significant initialization in InitInstance u'}SaX]0  
} m3zmyw}  
CC,_I>t  
CHookApp theApp; :^".cs?g  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) luD.3&0n  
{ W.b?MPy]  
 BOOL bProcessed=FALSE; b,U"N-6  
 if(HC_ACTION==nCode) ./nq*4=  
 { QV/ o;  
  if((lParam&0xc0000000)==0xc0000000){// Key up WO{V,<;  
   switch(wParam) hd*bPj ;  
   { Cisv**9  
    case VK_MENU: $oKT-G  
     MaskBits&=~ALTBIT; <RzGxhT  
     break; eZ+pZq  
    case VK_CONTROL: `BA wef  
     MaskBits&=~CTRLBIT; K cI'P(  
     break; Eshc"U  
    case VK_SHIFT: T0Lh"_X3  
     MaskBits&=~SHIFTBIT; fW^\G2Fk  
     break; d%tF~|#A%  
    default: //judge the key and send message K^0cL%dB  
     break; KICy! "af  
   } aq/'2U 7  
   for(int index=0;index<MAX_KEY;index++){ tHgn-Dhzr  
    if(hCallWnd[index]==NULL) ge*(w{|x  
     continue; +RLHe]9&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \[</|]'[  
    { =ZdP0l+V=k  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); \ci'Cbn\o  
     bProcessed=TRUE; C" vj#Tx  
    } ox9$aBjJ  
   } O_@  
  } ~"-+BG(5  
  else if((lParam&0xc000ffff)==1){ //Key down > cFH=um  
   switch(wParam) ,m<t/@^]  
   { O3, IR1  
    case VK_MENU: yu8xTh$:  
     MaskBits|=ALTBIT; k@QU<cvI  
     break; V 2-fJ!  
    case VK_CONTROL: _?]E)i'RI  
     MaskBits|=CTRLBIT; w7d(|`  
     break; CMk0(sztU_  
    case VK_SHIFT: Y"J' 'K  
     MaskBits|=SHIFTBIT; q)S70M_1  
     break; x;d*?69f]  
    default: //judge the key and send message UuDs  
     break; [k)xn3[  
   } $-4OveS~B  
   for(int index=0;index<MAX_KEY;index++) v5J% p4  
   { C>\0 "}iD  
    if(hCallWnd[index]==NULL) h>>KH*dQ  
     continue; ]:Y@pZ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (.6~t<DRv  
    { a "*DJ&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); |8,|>EyqK  
     bProcessed=TRUE; J,@SSmJ`  
    } "[W${q+0x  
   } s^:8bFn9$  
  } '~-JR>  
  if(!bProcessed){ Af'L=0  
   for(int index=0;index<MAX_KEY;index++){ p9c`rl_N  
    if(hCallWnd[index]==NULL) ID+ o6/V8  
     continue; r3.A!*!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) M[aF3bbN  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 1eiV[z$?  
   } 3{wr*L1%-~  
  } ySC;;k'  
 } )tc"4lp -  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); >(N0''eM]  
} $#|iKi<Y@j  
HR0t[*  
BOOL InitHotkey() !YJfP@"e6r  
{ x\/N09  
 if(hHook!=NULL){ 3]Jl\<0  
  nHookCount++; VXr'Z  
  return TRUE; (N6 3k1M  
 } =b\k$WQ_(  
 else }6Y D5?4  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); !nX}\lw  
  if(hHook!=NULL) z@WuKRsi  
   nHookCount++; 'rWu}#Nb  
  return (hHook!=NULL); Mlr]-Gu5Z  
} >cVEr+r9t  
BOOL UnInit() |g o jb  
{ g.3 . C?  
 if(nHookCount>1){ xc|pl!ns  
  nHookCount--; \_H-TbU8  
  return TRUE; (?luV#{5  
 } vAeh#V~#  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ]#)1(ZE  
 if(unhooked==TRUE){ RPH]@  
  nHookCount=0; *Ru@F:  
  hHook=NULL; IP)?dnwG  
 } ^;on  
 return unhooked; ?|Q[QP  
} _oOE MQb  
)TYrb:M'm  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) E: EXp7  
{ 6Xu^ cbD  
 BOOL bAdded=FALSE; <>!Y[Xr^  
 for(int index=0;index<MAX_KEY;index++){ 8&q|*/2  
  if(hCallWnd[index]==0){ 2|J>e(&akY  
   hCallWnd[index]=hWnd; &hciv\YT2W  
   HotKey[index]=cKey; j2oHwt6"  
   HotKeyMask[index]=cMask; 3Zy$NsY3  
   bAdded=TRUE; D%PrwfR  
   KeyCount++; r&^LSTU0!  
   break; 3$c Im+  
  } `jl 1Q,~2r  
 } irqNnnMGEa  
 return bAdded; cQ:Y@f 9  
} d[h2Y/AR  
'A#`,^]uLF  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) -c%K_2`  
{ )9(Mt _  
 BOOL bRemoved=FALSE; v=-8} S  
 for(int index=0;index<MAX_KEY;index++){ |~QHCg<  
  if(hCallWnd[index]==hWnd){ ^F5Q(A  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ +59tX2@Q  
    hCallWnd[index]=NULL; p([g/Q  
    HotKey[index]=0; `O:ecPD4M  
    HotKeyMask[index]=0; #2N']VP  
    bRemoved=TRUE; 2&L2G'  
    KeyCount--; k91ctEp9>  
    break; R-lB.9e#M  
   } z]P =>w  
  } (X!?#)fyn  
 }  C~C}b  
 return bRemoved; ]QB<N|ps  
} (eTe`   
mkJC *45  
void VerifyWindow() B@R3j  
{ 1e Wl:S}  
 for(int i=0;i<MAX_KEY;i++){ +9 Uo<6}  
  if(hCallWnd!=NULL){ L^}i7nJ  
   if(!IsWindow(hCallWnd)){ RbexsBq  
    hCallWnd=NULL; xG802?2i/;  
    HotKey=0; PS*=MyNa  
    HotKeyMask=0; fn6;  
    KeyCount--; 7/p&]0w  
   } wHGiN9A+  
  } (:JX;<-  
 } BvXA9YQ3  
} D1Yc_  
y)`f$Hl@1  
BOOL CHookApp::InitInstance() -2)6QKh~D  
{ !/1aot^(  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); *'b3Z3c,;  
 hins=AfxGetInstanceHandle(); &&(^;+  
 InitHotkey(); v]"W.<B,  
 return CWinApp::InitInstance(); _?9|0>]xG  
} m@|0iDS  
#>I*c _-  
int CHookApp::ExitInstance() ~Ibq,9i  
{ vDG AC'  
 VerifyWindow(); <W,M?r+  
 UnInit(); 3~Qvp )~  
 return CWinApp::ExitInstance(); ?Cg",k'  
}  s~A#B)wB  
k!{0ku}]  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 4Dd@&N  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) xY3 KKje  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ pS1f y]  
#if _MSC_VER > 1000 z#$>f*b  
#pragma once ]n8 5.DF  
#endif // _MSC_VER > 1000 r8o9C  
g{t)I0xm  
class CCaptureDlg : public CDialog '}\#bMeObg  
{ @O&<_&  
 // Construction KW3Dr`A  
 public: !,;>)R   
  BOOL bTray; 4|?y [j6  
  BOOL bRegistered; ~ULD{Ov'F  
  BOOL RegisterHotkey(); d&!;uzOx  
  UCHAR cKey; ,BUDo9h  
  UCHAR cMask; WFl, u!"A  
  void DeleteIcon(); {FIr|R&  
  void AddIcon(); cqP)1V]  
  UINT nCount; YQ\c0XG  
  void SaveBmp(); DEdJH4  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor J}$St|1y  
  // Dialog Data av}Giz  
  //{{AFX_DATA(CCaptureDlg) In[!g  
  enum { IDD = IDD_CAPTURE_DIALOG }; ;zMZ+GZ?;+  
  CComboBox m_Key; vG`;2laY  
  BOOL m_bControl; /7s^OkQ  
  BOOL m_bAlt; H$M#+EfL  
  BOOL m_bShift; <Cbah%X  
  CString m_Path; B=4xZJ Py  
  CString m_Number; aan)yP  
  //}}AFX_DATA O{4G'CgN(  
  // ClassWizard generated virtual function overrides $#b@b[h<w  
  //{{AFX_VIRTUAL(CCaptureDlg) :\]TAQd-  
 public: T^"-;  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 6c[&[L%  
 protected: ~,*=j~#h  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support EWI2qaSnO  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ,'7 X|z/_>  
  //}}AFX_VIRTUAL Bl\/q83(  
  // Implementation oS2L"#  
 protected: vlygS(Y_7  
  HICON m_hIcon; X9|={ng)g#  
  // Generated message map functions +,"O#`sy<  
  //{{AFX_MSG(CCaptureDlg) #@ quuiYq  
  virtual BOOL OnInitDialog(); w1#1s|  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); [iT*L)R4  
  afx_msg void OnPaint(); m$ubxI)  
  afx_msg HCURSOR OnQueryDragIcon(); !Zr 9t|_  
  virtual void OnCancel(); @X$~{Vp__  
  afx_msg void OnAbout(); DdI V~CxD  
  afx_msg void OnBrowse(); Kd<c'!  
  afx_msg void OnChange(); " [Z'n9C  
 //}}AFX_MSG )<<}8Fs  
 DECLARE_MESSAGE_MAP() e-4 Qw #cw  
}; " R=,W{=  
#endif #i t)  
K!L0|W H%!  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file _LYI#D  
#include "stdafx.h" X,ES=J0  
#include "Capture.h" rw9m+q  
#include "CaptureDlg.h" 5a0&LNm  
#include <windowsx.h> KOYU'hw  
#pragma comment(lib,"hook.lib") p3Ey[kURp  
#ifdef _DEBUG z2/E?$(  
#define new DEBUG_NEW V2v}F=  
#undef THIS_FILE ?}mbp4+j[  
static char THIS_FILE[] = __FILE__; q_J)68BR  
#endif  qHU=X"rn  
#define IDM_SHELL WM_USER+1 4!l%@R>O2  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); x{o&nhuk[S  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); %^zGM^PD  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; IP#?$X  
class CAboutDlg : public CDialog u0s25JY.%  
{ ,MmX(O0  
 public:  D|8Pe{`  
  CAboutDlg(); r+yl{  
  // Dialog Data wjRv =[  
  //{{AFX_DATA(CAboutDlg) 9fj8r3 F#  
  enum { IDD = IDD_ABOUTBOX }; eeOE\  
  //}}AFX_DATA 0@BhRf5  
  // ClassWizard generated virtual function overrides )0tq&  
  //{{AFX_VIRTUAL(CAboutDlg) w1N-`S:  
 protected: (8XP7c]5  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support x/)o'#d$|l  
  //}}AFX_VIRTUAL OG!+p}yD]  
  // Implementation W%&[gDp  
 protected: 0q !  
  //{{AFX_MSG(CAboutDlg) ?'jRUfl   
  //}}AFX_MSG s)eU^4m  
  DECLARE_MESSAGE_MAP() UtpK"U$XOU  
}; R9-Ps qmF  
]:K[{3iM  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) v 7g?  
{ DJ]GM|?  
 //{{AFX_DATA_INIT(CAboutDlg) 5N5Deb#V  
 //}}AFX_DATA_INIT vz87]InI  
} zCuN 8  
fG`<L;wi  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) /XeCJxo8  
{ ws_/F  
 CDialog::DoDataExchange(pDX); O{Y_j&1  
 //{{AFX_DATA_MAP(CAboutDlg) x&['g*[L0  
 //}}AFX_DATA_MAP 01br l^5K  
} "QV?C  
ZD`9Ez)5  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) (Y[q2b  
 //{{AFX_MSG_MAP(CAboutDlg) ;_TPJy  
 // No message handlers IW~q,X+`V  
 //}}AFX_MSG_MAP UpoTXA D}k  
END_MESSAGE_MAP() a6/$}lCq  
v"~0 3-SX  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Y6R+i0guz  
: CDialog(CCaptureDlg::IDD, pParent) =Felo8+   
{ iN]#XIQ%  
 //{{AFX_DATA_INIT(CCaptureDlg) b-Uy&+:X*d  
  m_bControl = FALSE; |s}7<A  
  m_bAlt = FALSE; =D}]|ie  
  m_bShift = FALSE; (& =gM  
  m_Path = _T("c:\\"); =0" Zse,  
  m_Number = _T("0 picture captured."); 6M)4v{F  
  nCount=0; 1|Q-|jq`  
  bRegistered=FALSE; $!m (S&f  
  bTray=FALSE; '(.vB~m7*+  
 //}}AFX_DATA_INIT 'xn3g;5  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Bq# l8u  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); exfJm'R?n  
} )r +o51gp  
q'zV9  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) /bBFPrW  
{ tAxS1<T4  
 CDialog::DoDataExchange(pDX); TM?RH{(r  
 //{{AFX_DATA_MAP(CCaptureDlg) :OFL@byS  
  DDX_Control(pDX, IDC_KEY, m_Key); wgV?1S>Z  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); >oOZDuj   
  DDX_Check(pDX, IDC_ALT, m_bAlt); <aVfgVS  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); P+/6-CJ  
  DDX_Text(pDX, IDC_PATH, m_Path); {YT@$K]w,  
  DDX_Text(pDX, IDC_NUMBER, m_Number); !92zC._  
 //}}AFX_DATA_MAP c1CUG1i  
} +o*&JoC  
~a RK=i$F  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 9U=~t%qW$  
//{{AFX_MSG_MAP(CCaptureDlg) ?yq $ >Qba  
 ON_WM_SYSCOMMAND() YS|Ve*t(L=  
 ON_WM_PAINT() wFHz<i!jr&  
 ON_WM_QUERYDRAGICON() Z'ZN^j{  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) KgCQ4w9  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) HT@/0MF{J  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 0)Wrfa  
//}}AFX_MSG_MAP /CT g3Q"KQ  
END_MESSAGE_MAP() hOTqbd}  
Y7L1`<SC  
BOOL CCaptureDlg::OnInitDialog() ]"DsZI-glW  
{ 7z@Jw  
 CDialog::OnInitDialog(); E#I^D/0  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); <lxE^M  
 ASSERT(IDM_ABOUTBOX < 0xF000); c7[+gc5}  
 CMenu* pSysMenu = GetSystemMenu(FALSE); JS:AHJSz  
 if (pSysMenu != NULL) X7~AqG  
 { x 8v2mnk  
  CString strAboutMenu; I"Gr<?r  
  strAboutMenu.LoadString(IDS_ABOUTBOX); m@2;9  
  if (!strAboutMenu.IsEmpty()) bFt$u]Yvo  
  { y"o@?bny  
   pSysMenu->AppendMenu(MF_SEPARATOR); FJYc*l  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); UrhSX!g/A>  
  } pZA0Go2!IN  
 } IBY(wx[5S  
 SetIcon(m_hIcon, TRUE); // Set big icon }.$5'VGO  
 SetIcon(m_hIcon, FALSE); // Set small icon s<;kTReA  
 m_Key.SetCurSel(0); MNzWTn@  
 RegisterHotkey(); <dAD-2O+  
 CMenu* pMenu=GetSystemMenu(FALSE); q/N1q&  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 9}_ccq  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Bf-KCqC".  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); CPj8`kl  
 return TRUE; // return TRUE unless you set the focus to a control G&?,L:^t  
} NZh\{!  
g /v"E+  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam)  $w@0}5Q  
{ m0(]%Kdw  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ,%uK^U.zk  
 { = "N?v-  
  CAboutDlg dlgAbout; 61"w>;d6  
  dlgAbout.DoModal(); #;WKuRv   
 } U<"@@``+N  
 else o[ua$+67E  
 { kbHfdA  
  CDialog::OnSysCommand(nID, lParam); JJ=%\j  
 } 7B"*< %<  
} $Z2Y%z6y  
4{Q{>S*h  
void CCaptureDlg::OnPaint() ivb?B,Lz0  
{ K>a+-QWK3  
 if (IsIconic()) "{igrl8  
 { vXP+*5d/ K  
  CPaintDC dc(this); // device context for painting y {PUkl q  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); +YA,HhX9  
  // Center icon in client rectangle zP(UaSXz/  
  int cxIcon = GetSystemMetrics(SM_CXICON); d2!A32m  
  int cyIcon = GetSystemMetrics(SM_CYICON); ZNX=]]HM<n  
  CRect rect; 6k@(7Mw8A  
  GetClientRect(&rect); e71dNL'$  
  int x = (rect.Width() - cxIcon + 1) / 2; bWe_<'N  
  int y = (rect.Height() - cyIcon + 1) / 2; m\];.Da  
  // Draw the icon ~t` uq  
  dc.DrawIcon(x, y, m_hIcon); {"x>ewAf  
 } 4U1!SR]s  
 else `YinhO:Z  
 { OlwORtWzZ  
  CDialog::OnPaint(); |sIr}}  
 } D')m8:>  
} &~SPDiu.t  
!9/1_Bjv  
HCURSOR CCaptureDlg::OnQueryDragIcon() ;*Z.|?3 MM  
{ <PayP3E  
 return (HCURSOR) m_hIcon; 2VgDM6h  
} d>f.p"B.gj  
0kp#+&)+  
void CCaptureDlg::OnCancel() Q-qM"8I  
{ tU :,s^E"#  
 if(bTray) fZH";_"1  
  DeleteIcon(); k-`5T mW  
  CDialog::OnCancel(); ZI0C%c.~  
} W_sAk~uK/  
|~y>R#u8pm  
void CCaptureDlg::OnAbout() 9AGf4tuy  
{ *co=<g]4KY  
 CAboutDlg dlg; ,8vqzI  
 dlg.DoModal(); S=R}#  
} qyx  '  
E6f{z9y6  
void CCaptureDlg::OnBrowse() u*aFWl]=  
{  >>nt3q  
 CString str; e7cqm*Qi  
 BROWSEINFO bi; Gd]!D~[1  
 char name[MAX_PATH]; x^J}]5{0  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); |1@/gqa  
 bi.hwndOwner=GetSafeHwnd(); rz  
 bi.pszDisplayName=name; b;;C><  
 bi.lpszTitle="Select folder"; AusCU~:>  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Xaca=tsO  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); =(-oQ<@v  
 if(idl==NULL) 1syI%I1  
  return; :k"VR,riF  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); j%V95M% $  
 str.ReleaseBuffer(); Gh:hfHiG  
 m_Path=str; 5dPPm%U{  
 if(str.GetAt(str.GetLength()-1)!='\\') uzA_Zjx  
  m_Path+="\\"; )l|/lj  
 UpdateData(FALSE); \U0p?wdr:  
} >\x   
<Kq4thR  
void CCaptureDlg::SaveBmp() O$2'$44HX  
{ b\dzB\,&  
 CDC dc; etPb^&#$  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); KqE5{ q  
 CBitmap bm; BJ]4j-^o  
 int Width=GetSystemMetrics(SM_CXSCREEN); :JEzfI1  
 int Height=GetSystemMetrics(SM_CYSCREEN); b&i0)/;  
 bm.CreateCompatibleBitmap(&dc,Width,Height); nVp*u9]  
 CDC tdc; ')8c  
 tdc.CreateCompatibleDC(&dc); i r-= @@  
 CBitmap*pOld=tdc.SelectObject(&bm); Rqk;!N  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); C XZO  
 tdc.SelectObject(pOld); |?tUUT!`t  
 BITMAP btm; 2GHmA_7P  
 bm.GetBitmap(&btm); '}Tf9L%  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; POl[]ni=>  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); $Eo)i  
 BITMAPINFOHEADER bih; !D_Qat  
 bih.biBitCount=btm.bmBitsPixel; C|@6rr9TA  
 bih.biClrImportant=0; "8'aZ.P  
 bih.biClrUsed=0; %s^2m"ca}=  
 bih.biCompression=0; ~; emUU  
 bih.biHeight=btm.bmHeight; \G!TC{6  
 bih.biPlanes=1; "'@iDq%y  
 bih.biSize=sizeof(BITMAPINFOHEADER); Q}A*{9#|  
 bih.biSizeImage=size; \UD:9g"  
 bih.biWidth=btm.bmWidth; Yb~[XS |p  
 bih.biXPelsPerMeter=0; /hojm6MM  
 bih.biYPelsPerMeter=0; >sUavvJ~x  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); |#6B<'e'  
 static int filecount=0; >A+0"5+_p  
 CString name; U|Du9_0  
 name.Format("pict%04d.bmp",filecount++); tY1M7B^~  
 name=m_Path+name; IC1oW)  
 BITMAPFILEHEADER bfh; Gs2| #*6  
 bfh.bfReserved1=bfh.bfReserved2=0; nO'lN<L  
 bfh.bfType=((WORD)('M'<< 8)|'B'); @-7h}2P Q  
 bfh.bfSize=54+size; )YB @6TiD  
 bfh.bfOffBits=54; LFi8@  
 CFile bf; F@76V$U.  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ B ``)  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); :$>Co\D  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); .??[qBOTE  
  bf.WriteHuge(lpData,size); K KPQ[3g  
  bf.Close(); Y6>@zznk  
  nCount++; J`&*r;""V  
 } 'T8(md299  
 GlobalFreePtr(lpData); 8: x{  
 if(nCount==1) Q*W`mFul  
  m_Number.Format("%d picture captured.",nCount); )YP"\E  
 else jO|D# nC  
  m_Number.Format("%d pictures captured.",nCount); P|>pm]>C  
  UpdateData(FALSE); 4H<@da}  
} .ykCmznf*  
JDQ7  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ot"3 3I  
{ E3):8>R;1  
 if(pMsg -> message == WM_KEYDOWN) N3_rqRd^  
 { ypCarvQT  
  if(pMsg -> wParam == VK_ESCAPE) P)>`^wc$  
   return TRUE; 3C+!Y#F  
  if(pMsg -> wParam == VK_RETURN) _I"T(2Au  
   return TRUE; u9TiEEof3  
 } 6 J&_H(^  
 return CDialog::PreTranslateMessage(pMsg); %Km^_JM  
} oVG/[e|c'  
/M}jF*5N  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 69z,_p$@:  
{ w?r   
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Zj(2$9IU  
  SaveBmp(); ~^&]8~m*d  
  return FALSE; rF/k$_bFt  
} M<4tjVQ6  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ $jpAnZR- /  
 CMenu pop; {0&'XA=j  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); S? -6hGA j  
 CMenu*pMenu=pop.GetSubMenu(0); )L)jvCw,e  
 pMenu->SetDefaultItem(ID_EXITICON); W^es"\  
 CPoint pt; 5uVSbo.  
 GetCursorPos(&pt); 7K 8tz}  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); "sM 3NY  
 if(id==ID_EXITICON) R-L*N$@!  
  DeleteIcon(); C J@G8>  
 else if(id==ID_EXIT) Rxg ^vM*  
  OnCancel(); l*v6U'J  
 return FALSE; TA2?Ia;@xV  
} t_VF=B^LuR  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 0[f8Gb3  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) _a~uIGN  
 AddIcon(); &<oZl.T  
 return res; ([mC!d@a  
} \:'|4D]'I  
a2'si}'3  
void CCaptureDlg::AddIcon() MmZs|pXk  
{ 9kpCn.rJ  
 NOTIFYICONDATA data; 'aW}&!H M  
 data.cbSize=sizeof(NOTIFYICONDATA); 6 lp.0B  
 CString tip; qs["&\@  
 tip.LoadString(IDS_ICONTIP); i9QL}d  
 data.hIcon=GetIcon(0); 5Tl3k=o}  
 data.hWnd=GetSafeHwnd(); P?.j wI  
 strcpy(data.szTip,tip); lY.{v]i }  
 data.uCallbackMessage=IDM_SHELL; (jV_L 1D  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; "@!B"'xg  
 data.uID=98; LW"p/`#<  
 Shell_NotifyIcon(NIM_ADD,&data); c{qoASc?  
 ShowWindow(SW_HIDE); x#-+//  
 bTray=TRUE; vE}>PEfA  
} 1ymq7F(2  
F$|Ec9  
void CCaptureDlg::DeleteIcon() eJ=K*t|  
{ /^m3?q[a  
 NOTIFYICONDATA data; _o'3v=5T  
 data.cbSize=sizeof(NOTIFYICONDATA); yV'<l .N  
 data.hWnd=GetSafeHwnd(); hC nqe  
 data.uID=98; lZt{L0  
 Shell_NotifyIcon(NIM_DELETE,&data); Y$@?Y/rhR  
 ShowWindow(SW_SHOW); z_A:MoYf o  
 SetForegroundWindow(); g9rsw7  
 ShowWindow(SW_SHOWNORMAL); BEm~o#D  
 bTray=FALSE; I^CKq?V?:  
} q h+c}"4m  
gz,x6mnQ  
void CCaptureDlg::OnChange() v>4kF _N  
{ ]0 g$3  
 RegisterHotkey(); ^:(:P9h  
} b <1k$0J6  
nB8JdM2h{  
BOOL CCaptureDlg::RegisterHotkey() -F]0Py8(  
{ FL,av>mV  
 UpdateData(); 5bfd8C  
 UCHAR mask=0; uB`H9  
 UCHAR key=0; wva| TZ  
 if(m_bControl) .y)Y20=o!  
  mask|=4; 2I!L+j_  
 if(m_bAlt) K F:W:8  
  mask|=2; , :10  
 if(m_bShift) Ja*k |Rz~  
  mask|=1; 'K"7Tex  
  key=Key_Table[m_Key.GetCurSel()]; jRCf!RO  
 if(bRegistered){ tH}$j  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); _:ORu Vk  
  bRegistered=FALSE; 5UTIGla  
 } o:.6{+|N  
 cMask=mask; 7[b]%i  
 cKey=key; -UhSy>m  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); #VLO6  
 return bRegistered; RfZZqe U  
} G;'=#c ^  
_(TYR*  
  四、小结 SviGLv;oR  
#nzVgV]  
  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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