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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: Tp.iRFFkP  
  @g` ,'r  
  一、实现方法 J;9QDrl`  
QRix_2+  
  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: [_B&7#3>7  
]fmfX  
#pragma data_seg("shareddata") Nv#, s_hG  
HHOOK hHook =NULL; //钩子句柄 o*S $j Cf?  
UINT nHookCount =0; //挂接的程序数目 X Ow^"=Oa[  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 MPw7!G(qj  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 zb*4Nsda:  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey FO3*[O   
static int KeyCount =0; n]g,)m  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 i2c<q0u  
#pragma data_seg() 8 ?R_O}U  
\r&@3a.>  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 \?I wR]@y  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: {N`<e>A]{  
+=xRr?F  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 69w"$V k  
cKey,UCHAR cMask) [wxI X  
{ ;'+cT.cmH  
 BOOL bAdded=FALSE; z-E4-\a  
 for(int index=0;index<MAX_KEY;index++){ ^vz@d+\Kd  
  if(hCallWnd[index]==0){ \d`Sz *  
   hCallWnd[index]=hWnd; =1?yS3  
   HotKey[index]=cKey; q/G5aO*  
   HotKeyMask[index]=cMask; CzbNG^+  
   bAdded=TRUE; +u)$o  
   KeyCount++; PA[Rhoit,  
   break; Gi2Ey37]O  
  } O/~^}8TLL  
 } .OUE'5e p  
 return bAdded; K?I&,t_*R  
} x/^zNO\1  
//删除热键 vG}oo  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) kV<)>Gs  
{ !Z)^c&  
 BOOL bRemoved=FALSE; 1W7BN~p14  
 for(int index=0;index<MAX_KEY;index++){ w#b2iE+Bw  
  if(hCallWnd[index]==hWnd){ \mG M#E  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 9D21e(7X  
    hCallWnd[index]=NULL; qa?y lR"kA  
    HotKey[index]=0; gWPa8q<b  
    HotKeyMask[index]=0; 2J;CiEB  
    bRemoved=TRUE; +.uk#K0o  
    KeyCount--; '1nU[,Wj  
    break; |Q;1;QXd  
   } T`;M!-)2  
  } V0(ABi:d  
 } 1\kehCt  
 return bRemoved; u'."E7o#  
} GC3L2C0)k  
8B9zo&  
4Fq}*QJ-  
  DLL中的钩子函数如下: .9 QQ]fLs  
%q^]./3p  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 0&~u0B{  
{ SsZzYj.d  
 BOOL bProcessed=FALSE; -/?<@*n  
 if(HC_ACTION==nCode) '_Oprx  
 { bq ]a8tSB  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 {xH@8T$DX  
   switch(wParam) I-"{m/PEdg  
   {  n5/Q)*e0'#  
    case VK_MENU:  (v}:  
     MaskBits&=~ALTBIT; 0rUf'S ?K  
     break; [l:.Q?? )|  
    case VK_CONTROL: Mr(3]EfgO  
     MaskBits&=~CTRLBIT; e:<> Yq+  
     break; uU s>/+  
    case VK_SHIFT: .EwK>ro4  
     MaskBits&=~SHIFTBIT; H'>  
     break; q4oZJ-`  
    default: //judge the key and send message ks$G6WC  
     break; 5c8x: e@  
   } x ,W+:l9~s  
   for(int index=0;index<MAX_KEY;index++){ sn%fE  
    if(hCallWnd[index]==NULL) kF .b)  
     continue; dPId= w)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 7(Kc9sJC%%  
    { %|>i2  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); `314.a6S  
     bProcessed=TRUE; ,~#hHhR_  
    } J)o%83//  
   } ,?+yu6eLb  
  } `RRORzXoS  
  else if((lParam&0xc000ffff)==1){ //有键按下 P9vROzXK  
   switch(wParam) [G*mQ@G9  
   { ;U&VPIX$  
    case VK_MENU: rv:O|wZ  
     MaskBits|=ALTBIT; "5K: "m  
     break; ^da-R;o]  
    case VK_CONTROL: (n\ cs$  
     MaskBits|=CTRLBIT; %<t/xAge  
     break; 4y]*"(sQ;  
    case VK_SHIFT: tP-c>|cz  
     MaskBits|=SHIFTBIT; =_Rd0,  
     break; e<K=Q$U.  
    default: //judge the key and send message }{J8U2])k  
     break; }: e9\r)  
   } l<+k[@Vox  
   for(int index=0;index<MAX_KEY;index++){ 3Daq5(fLP  
    if(hCallWnd[index]==NULL) xmDwoLU  
     continue; m`~ Qr~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &0ra a  
    { FmPF7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); H'2 =yhtVh  
     bProcessed=TRUE; ^E^:=Q?'_  
    } $ }53f'QjW  
   } al/~  
  } Alz#zBGb  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 iKwVYL  
   for(int index=0;index<MAX_KEY;index++){ 9}N*(PI  
    if(hCallWnd[index]==NULL) x{E[qH_1Fm  
     continue; ln5On_Wm  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) & BkNkb0  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ~gN'";1i  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ]CjODa  
   } e]QkZg2?Yn  
  } #~b9H05D  
 } `m5iZxhw  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); V.J%4&^X  
} ZfU_4Pl->  
@u^Ib33  
  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: UWHC]V?  
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BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); @)B_e*6>'  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); "<n{/x(  
DWAU8>c+  
  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: @,]v'l!u  
<IYt*vlm  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 4.8,&{w<m  
{ 0^=S:~G  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) #qWEyb2UZ  
 { 0:*$i(2  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 n2E2V<#   
  SaveBmp(); hf[K\aAk  
  return FALSE; S`::f(e  
 } 7j+.H/2  
 …… //其它处理及默认处理 t%)L8%Jr  
} vzL>ZBe Z  
kQ +   
]zO]*d=m  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 g!$ "CX%8  
a <3oyY'  
  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。 ^P[*yf  
UxW~yk  
  二、编程步骤 7 ?Fl [FW$  
;.Kzc3yz}  
  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"; v[x`I;  
?NL2|8  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; B~^\jRd "  
^JTfRZ :a  
  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; ?@~FT1"6G  
f*Kipgp  
  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; {1o=/&  
}V 1sY^C  
  5、 添加代码,编译运行程序。 0t) IW D  
fqcyCu7Ep  
三、程序代码 hm& ~6rB  
ZrTq)BZ  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL thh, V   
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ?F-,4Ox{/  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 1xw},y6T2  
#if _MSC_VER > 1000 Z1Ms ~tch  
#pragma once :!%oQQO  
#endif // _MSC_VER > 1000 X **w RF  
#ifndef __AFXWIN_H__ R{T4AZ@,'  
#error include 'stdafx.h' before including this file for PCH T/H*Bo *=5  
#endif .m<-)Kx  
#include "resource.h" // main symbols \1tce`+  
class CHookApp : public CWinApp nP}/#Wy  
{ |aZ^K\yIF  
 public: { Z|C  
  CHookApp(); /:S.(" Unv  
  // Overrides eA!aUu  
  // ClassWizard generated virtual function overrides w:qwU\U>x  
  //{{AFX_VIRTUAL(CHookApp) .N%$I6w  
 public: |Oo WGVc  
  virtual BOOL InitInstance(); f~]5A%=cZ  
  virtual int ExitInstance(); WYq, i}S  
  //}}AFX_VIRTUAL \UXQy{Ex  
  //{{AFX_MSG(CHookApp) wtZe\ h  
  // NOTE - the ClassWizard will add and remove member functions here. Iv{}U\ u  
  // DO NOT EDIT what you see in these blocks of generated code ! a@%FwfIu  
  //}}AFX_MSG CSs3l  
  DECLARE_MESSAGE_MAP() 2W}RXqV<  
}; z.QW*rW9  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); }%VHBkuc  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1Ao"DxZHy7  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); "MyYu}AD  
BOOL InitHotkey(); 1r;Q5[@  
BOOL UnInit(); 46mu,v  
#endif  "d A"N$  
&oT]ycz%  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. tvd/Y|bV=  
#include "stdafx.h" )&*&ZL0  
#include "hook.h" 77)C`]0(  
#include <windowsx.h> 0hPm,H*Y]  
#ifdef _DEBUG .9`.\v6R  
#define new DEBUG_NEW [ P 8e=;  
#undef THIS_FILE a+ ]@$8+  
static char THIS_FILE[] = __FILE__; hRME;/r]X  
#endif }@x0@sI9  
#define MAX_KEY 100 o<x2,uT  
#define CTRLBIT 0x04 p}C3<[Nk  
#define ALTBIT 0x02 RlpW)\{j?  
#define SHIFTBIT 0x01 `/0FXb 8h  
#pragma data_seg("shareddata") tf>?;  
HHOOK hHook =NULL; C3 D1rS/I  
UINT nHookCount =0; ~V(WD;Mk  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey k&9 b&-=fk  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ](^xA `  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey |`,%%p|T%  
static int KeyCount =0; P,,@&* :  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift IuRKj8J)o  
#pragma data_seg() ,UY],;ib  
HINSTANCE hins; ?:UDK?  
void VerifyWindow(); La9dFe-uu{  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) *`|F?wF  
//{{AFX_MSG_MAP(CHookApp) `?~pk)<C].  
// NOTE - the ClassWizard will add and remove mapping macros here. ,;UVQwY  
// DO NOT EDIT what you see in these blocks of generated code! Qp{{OjD  
//}}AFX_MSG_MAP ' R{ [Y)  
END_MESSAGE_MAP() 4SmhtC  
C]{43  
CHookApp::CHookApp() YrA#NTB_o  
{ + -U7ogs  
 // TODO: add construction code here, ^G=s<pp  
 // Place all significant initialization in InitInstance $=t&NM  
} xaejG/'iK  
7Qz Uw  
CHookApp theApp; 3. Kh  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ,LG6py&aT  
{ !MoGdI-<r[  
 BOOL bProcessed=FALSE; IEHAPt'  
 if(HC_ACTION==nCode) )fv0H&g  
 { l\a 0 k4  
  if((lParam&0xc0000000)==0xc0000000){// Key up 2}t2k>  
   switch(wParam) TN(1oJ:  
   { W,}C*8{+  
    case VK_MENU: wQDKv'zU1  
     MaskBits&=~ALTBIT; 1)H+iN|im/  
     break; {i3]3V"Xp  
    case VK_CONTROL: `5Q0U%`W  
     MaskBits&=~CTRLBIT; {Dqf.w>t  
     break; N_Yop  
    case VK_SHIFT: sFMSH :5z  
     MaskBits&=~SHIFTBIT; Wcw$ Zv  
     break; /qEoiL###  
    default: //judge the key and send message B_nim[72  
     break; | M4_@P  
   } 9>%ti&_-jt  
   for(int index=0;index<MAX_KEY;index++){  GVe[)R  
    if(hCallWnd[index]==NULL) BG/M3  
     continue; j$siCsF  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) eNpGa0 eG  
    { Y0 Ta&TYZ0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); *e!0ZB3J  
     bProcessed=TRUE; /{^Qup  
    } =rGjOb3+  
   } vEk jd#  
  } SVo:%mX  
  else if((lParam&0xc000ffff)==1){ //Key down U)o(}:5xF  
   switch(wParam) ?x=;?7  
   { LDx1@a|83  
    case VK_MENU: +.:- :  
     MaskBits|=ALTBIT; &V:iy  
     break; gYw4YP0Gz  
    case VK_CONTROL: z`y!C3w<  
     MaskBits|=CTRLBIT; ilHZx2 k  
     break; iO~3rWQ  
    case VK_SHIFT: <x *.M"6?  
     MaskBits|=SHIFTBIT; ??Q'| r  
     break; tY~EB.%  
    default: //judge the key and send message ~sx?aiO  
     break; fKb8)PDP  
   } Z`Rrv$M!  
   for(int index=0;index<MAX_KEY;index++) Nyip]VwMJ  
   { uPQ:}zL2  
    if(hCallWnd[index]==NULL) ^giseWR(  
     continue; '1_CMr  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >$j?2,Za(V  
    { }vgeQh-G  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); DKp+ nq$  
     bProcessed=TRUE; >hQeu1 ~W  
    } S=@.<gS  
   } yyW;VKN  
  } 9(V12gn+lk  
  if(!bProcessed){ }4b 4<Sm_h  
   for(int index=0;index<MAX_KEY;index++){ a6cq0g[#z  
    if(hCallWnd[index]==NULL) 5ro^<P0f**  
     continue; | U )  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 3A!`U6C(  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); YzNSZJPD  
   } Btp 9v<"  
  } JvX]^t/}  
 } ^}fc]ovV  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); CB]#`|f  
} ^{lcj  
Ii FeO  
BOOL InitHotkey() PUZH[-:c  
{ NitsUg@<  
 if(hHook!=NULL){ Cdg/wRje  
  nHookCount++; e:D8.h+ &}  
  return TRUE; *")Req  
 } [|.IXdJ!  
 else =bgzl=A`  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); _FR_6*C)5  
  if(hHook!=NULL) 6}4?, r  
   nHookCount++; ?5-Y'(r  
  return (hHook!=NULL); K%iWUl;  
} B|XrjI?  
BOOL UnInit() lLhvpvT  
{ ;+jz=9Q-  
 if(nHookCount>1){ jkTC/9AE|  
  nHookCount--; v"ZNS  
  return TRUE; yK9:LXhf  
 } BQTZt'p  
 BOOL unhooked = UnhookWindowsHookEx(hHook); |Lf>Z2E  
 if(unhooked==TRUE){ tqbYrF)  
  nHookCount=0; -|V1A[  
  hHook=NULL; imw,Nb  
 } !1(*D*31  
 return unhooked; Wg{ 9X#|  
} m#w1?y)Z@X  
*Cf5D6=Q  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Bl[4[N  
{ ;\a?xtIy  
 BOOL bAdded=FALSE; F/p/&9  
 for(int index=0;index<MAX_KEY;index++){ [>--U)/  
  if(hCallWnd[index]==0){ lidVe]>  
   hCallWnd[index]=hWnd; r)<c ~\0 7  
   HotKey[index]=cKey; AwnQ5-IR\  
   HotKeyMask[index]=cMask; t^Z-0jH  
   bAdded=TRUE; k0r93 xa  
   KeyCount++; b:B+x6M  
   break; 4, EX2  
  } ^Mvgm3hg  
 } Ln+;HorZ]  
 return bAdded; ;Qn)~b~  
} "{9^SPsp  
+%Z#!1u  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) uvG' Kx  
{ c o 8bnH  
 BOOL bRemoved=FALSE; 0nr5(4h  
 for(int index=0;index<MAX_KEY;index++){ nMM:Tr  
  if(hCallWnd[index]==hWnd){ ~cr##Ff 5  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ (}B3df  
    hCallWnd[index]=NULL; E)>.2{]C>  
    HotKey[index]=0; okm }%#|  
    HotKeyMask[index]=0; O}s Mqh  
    bRemoved=TRUE; Q Uy7Q$W  
    KeyCount--; i8w/a  
    break; ~cv322N   
   } ?i{/iH~Sf  
  } p C^=?!:U  
 } Phq"A[4=O  
 return bRemoved; CKE):kHu  
} MD98N{+[|  
E4N/or  
void VerifyWindow() DbWaF5\yD  
{ 1VKu3  
 for(int i=0;i<MAX_KEY;i++){ "%(SLQOyy  
  if(hCallWnd!=NULL){ Lm&BT)*  
   if(!IsWindow(hCallWnd)){ l4bL N  
    hCallWnd=NULL; po9f[/s'+o  
    HotKey=0; _.%U}U  
    HotKeyMask=0; ^V}c8 P|  
    KeyCount--; ]A=yj@o$xN  
   } 8/vGA=  
  } *Z8qd{.$q  
 } Uee(1  
} P9 w);jp;  
d%Ls'[Y^_0  
BOOL CHookApp::InitInstance() c/lT S  
{ T{So 2@_&  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); yQcIfl]f  
 hins=AfxGetInstanceHandle(); u']}Z% A9`  
 InitHotkey(); %ZsdCQc{`  
 return CWinApp::InitInstance(); :y.~IQN  
} Y 'y yrn}  
8|L;y[v  
int CHookApp::ExitInstance() 7!F -.kG  
{ KwHlpW*  
 VerifyWindow(); XvSng"f.  
 UnInit(); icK$W2<8mg  
 return CWinApp::ExitInstance(); H-,p.$3}  
} y[{}124  
~2;\)/E\  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file G\z5Ue*  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 8kLHQ0pmu  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ QXu[<V  
#if _MSC_VER > 1000 V]Rt[l]  
#pragma once |b4f3n  
#endif // _MSC_VER > 1000 Skg}/Ek  
+!Q*ie+q  
class CCaptureDlg : public CDialog _vJ(F  
{ <2af&-EG s  
 // Construction -}1TT@  
 public: MWv(/_b  
  BOOL bTray; dY{qdQQ}  
  BOOL bRegistered; 8 =oUE$9  
  BOOL RegisterHotkey(); )g?ox{Hol  
  UCHAR cKey; k:F{U^!p|  
  UCHAR cMask;  RnSll-  
  void DeleteIcon(); p\P)    
  void AddIcon(); UHgW-N"  
  UINT nCount; Pcjrv:0$  
  void SaveBmp(); 7,s5Gd-  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor LAFxeo  
  // Dialog Data 2>[xe  
  //{{AFX_DATA(CCaptureDlg) <naxpflom0  
  enum { IDD = IDD_CAPTURE_DIALOG }; E!RlH3})  
  CComboBox m_Key; 99tUw'w  
  BOOL m_bControl; ix hF,F  
  BOOL m_bAlt; 4T]A! y{  
  BOOL m_bShift; Y(u`K=*  
  CString m_Path; 9;Q|" T  
  CString m_Number; VAo`R9^D#  
  //}}AFX_DATA 2bOl`{x  
  // ClassWizard generated virtual function overrides aoQ$"PF9  
  //{{AFX_VIRTUAL(CCaptureDlg) ejia4(Cd  
 public: H$V`,=H  
  virtual BOOL PreTranslateMessage(MSG* pMsg); dT0>\9ZNr  
 protected: j#Qnu0D  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ik](k"1{  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); f/QwXO-U  
  //}}AFX_VIRTUAL ^T#jBqe  
  // Implementation W&k@p9  
 protected: :uJHFF xg  
  HICON m_hIcon; 9}_'  
  // Generated message map functions i;atYltEJ2  
  //{{AFX_MSG(CCaptureDlg) &e78xtA{  
  virtual BOOL OnInitDialog(); X~cdM1z?  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); j#U,zsv:  
  afx_msg void OnPaint(); .D*~UI  
  afx_msg HCURSOR OnQueryDragIcon(); +eO>> ~Z  
  virtual void OnCancel(); "Zy:q'`o  
  afx_msg void OnAbout(); jK".iqx2L  
  afx_msg void OnBrowse(); v>HOz\F  
  afx_msg void OnChange(); YG /@=Z.  
 //}}AFX_MSG n.i 8?:  
 DECLARE_MESSAGE_MAP() .SLpgYFL{  
}; (xE |T f  
#endif /M JI^\CA  
/~Bs5f.]?  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file MsZx 0]  
#include "stdafx.h" 4JyA+OD4{  
#include "Capture.h" S.{   
#include "CaptureDlg.h" yh/JHo;  
#include <windowsx.h> UM`{V5NG#  
#pragma comment(lib,"hook.lib") *$5p,m6G  
#ifdef _DEBUG x]@z.Yj  
#define new DEBUG_NEW Qea"49R  
#undef THIS_FILE F2\&rC4v  
static char THIS_FILE[] = __FILE__; 9|3sNFGX  
#endif W/3sJc9  
#define IDM_SHELL WM_USER+1 )dFPfu&HL  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); *VmX.  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  +hKs  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; MsBm0r`a  
class CAboutDlg : public CDialog IM ncl=1  
{ r{B28'f[  
 public: 2;j<{'  
  CAboutDlg(); V= -  
  // Dialog Data )&O6d .  
  //{{AFX_DATA(CAboutDlg) Mna yiJl  
  enum { IDD = IDD_ABOUTBOX }; c%WO#}r|  
  //}}AFX_DATA BY&{fWUo  
  // ClassWizard generated virtual function overrides cly}[<w!  
  //{{AFX_VIRTUAL(CAboutDlg) 7#W]Qj  
 protected: ZyDNtX%  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support }n "5r(*^@  
  //}}AFX_VIRTUAL )t@9!V  
  // Implementation alB'l  
 protected: 4U_+NC>b  
  //{{AFX_MSG(CAboutDlg) 73]8NVm  
  //}}AFX_MSG F,A+O+  
  DECLARE_MESSAGE_MAP() g$jTP#%b  
}; (w{T[~6  
j!y9E~Zz  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) :p,|6~b$  
{ ya{`gjIlW  
 //{{AFX_DATA_INIT(CAboutDlg) ]jY^*o[  
 //}}AFX_DATA_INIT fm@Pa} ,  
} _5H~1G%q  
(~%NRH<\  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) M^Y[Y@U=p  
{ jf-XVk5q  
 CDialog::DoDataExchange(pDX); "\O7_od-  
 //{{AFX_DATA_MAP(CAboutDlg) 2Wu`Dp;&l  
 //}}AFX_DATA_MAP [\#ANA"  
} G0|}s&$yL  
$,J0) ~  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 4H (8BNgzV  
 //{{AFX_MSG_MAP(CAboutDlg) N$=9R  
 // No message handlers 39hep8+  
 //}}AFX_MSG_MAP ^N[ Cip}8  
END_MESSAGE_MAP() LT Pr8^  
hRRxOr#*$  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) m[^ )Q9o}  
: CDialog(CCaptureDlg::IDD, pParent) .d}yQ#5z  
{ 4sntSlz)~k  
 //{{AFX_DATA_INIT(CCaptureDlg) 2$kB^g!:o  
  m_bControl = FALSE; bhGRD{=  
  m_bAlt = FALSE; U65l o[  
  m_bShift = FALSE; tW4X+d"  
  m_Path = _T("c:\\"); ju'a Uzn  
  m_Number = _T("0 picture captured."); j6EF0/_|e  
  nCount=0; 4r `I)  
  bRegistered=FALSE; <8;~4"'a  
  bTray=FALSE; 38T] qz[Sn  
 //}}AFX_DATA_INIT Y.) QNTh  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 d,N6~?B  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); -(F} =o'  
} B1J,4  
yf0v,]v[  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) pi~5}bF!a  
{ wn?oHz*  
 CDialog::DoDataExchange(pDX); }nX0h6+1  
 //{{AFX_DATA_MAP(CCaptureDlg) dQ7iieT  
  DDX_Control(pDX, IDC_KEY, m_Key); wM4{\  f\  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); M9A1 8d|  
  DDX_Check(pDX, IDC_ALT, m_bAlt); zn 0y`9!n?  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); <Vk}U   
  DDX_Text(pDX, IDC_PATH, m_Path); @IsUY(Gu  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Y,v9o  
 //}}AFX_DATA_MAP B)[RIs  
} T0")Ryu  
@wa"pWx8  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) x'|9A?ez@Z  
//{{AFX_MSG_MAP(CCaptureDlg) Jk-WD"J6  
 ON_WM_SYSCOMMAND() 0RtZTCGO  
 ON_WM_PAINT() qbsod  
 ON_WM_QUERYDRAGICON() K<:%ofB"S  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) c5$DHT @N"  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) >n3GvZ5%  
 ON_BN_CLICKED(ID_CHANGE, OnChange) &gruYZGK  
//}}AFX_MSG_MAP p\6}<b"p  
END_MESSAGE_MAP() b9vud r  
u-|%K.A  
BOOL CCaptureDlg::OnInitDialog() s`H|o'0  
{ __xmn{{L6P  
 CDialog::OnInitDialog(); & ;.rPU  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); lY"l6.c  
 ASSERT(IDM_ABOUTBOX < 0xF000); p@% Pdx  
 CMenu* pSysMenu = GetSystemMenu(FALSE); $3l#eKZA  
 if (pSysMenu != NULL) @,e o*  
 { " Ot%{&:2  
  CString strAboutMenu; VD7-;  
  strAboutMenu.LoadString(IDS_ABOUTBOX); esA^-$  
  if (!strAboutMenu.IsEmpty()) S$hxR  
  { M j[+h|e  
   pSysMenu->AppendMenu(MF_SEPARATOR); ;Us6:}s  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ?i0+h7 =6  
  } DJgM>&Y6,  
 } `Wjq$*  
 SetIcon(m_hIcon, TRUE); // Set big icon C(v'7H{4cW  
 SetIcon(m_hIcon, FALSE); // Set small icon ? OF $J|h  
 m_Key.SetCurSel(0); QxLrpM"O  
 RegisterHotkey(); Yb 5@W/'  
 CMenu* pMenu=GetSystemMenu(FALSE); }wn|2K'  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ?m2FN< S  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); nw- -  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 4cSs=|m?+  
 return TRUE; // return TRUE unless you set the focus to a control gizY4~ j  
} 1}|y^oB\-  
yN{**?b  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) jZqa+nG51  
{ mfI[9G  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Bf00&PE;  
 {  2=;ZJ  
  CAboutDlg dlgAbout; @H$am  
  dlgAbout.DoModal(); GY-4w@Wl  
 } 8aVQW_m}  
 else iUh7eR9  
 { N?{Zrff2"O  
  CDialog::OnSysCommand(nID, lParam); 9NVtvBA  
 } [_xOz4`%  
} <:/aiX8  
v"(6rZsa  
void CCaptureDlg::OnPaint() #S/~1{   
{ hlV(jz  
 if (IsIconic()) p+b9D  
 { ~I> |f  
  CPaintDC dc(this); // device context for painting  EJC}"%h  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); um]*nXIr  
  // Center icon in client rectangle 1_LKqBgo  
  int cxIcon = GetSystemMetrics(SM_CXICON);  lY`WEu  
  int cyIcon = GetSystemMetrics(SM_CYICON); "~=}&  
  CRect rect; @(a~ p  
  GetClientRect(&rect); M<Z#4Gg#4  
  int x = (rect.Width() - cxIcon + 1) / 2; mD +9/O!  
  int y = (rect.Height() - cyIcon + 1) / 2; $<Gt^3e  
  // Draw the icon EB+4]MsD  
  dc.DrawIcon(x, y, m_hIcon); i=b'_SZ '  
 } @]X!#&2>  
 else wjX0r7^@  
 { h6LjReNo  
  CDialog::OnPaint(); t"%~r3{  
 } AM!P?${a  
} av(qV$2  
7eM6 B#rI  
HCURSOR CCaptureDlg::OnQueryDragIcon() LL3| U  
{ fy>3#`T-  
 return (HCURSOR) m_hIcon; !$iwU3~<  
} Z%.L d2Q{  
kp[&SKU c  
void CCaptureDlg::OnCancel() 7]L}~  
{ NPBOG1q%  
 if(bTray) +gndW  
  DeleteIcon(); C|FI4/-e  
  CDialog::OnCancel(); ]OKKR/:  
} J^` pE^S  
)0 6. dZq\  
void CCaptureDlg::OnAbout() C;ha2UV0H  
{ O>rz+8T  
 CAboutDlg dlg; &JLKHwi/  
 dlg.DoModal(); PB8U+  
} uh)f/)6  
96F+I!qC  
void CCaptureDlg::OnBrowse() cru&nH*O^  
{ GF<SQHL,  
 CString str; w"Zws[pm]  
 BROWSEINFO bi; = "Lb5!  
 char name[MAX_PATH]; Jn?ZJZ  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); P6^\*xkMr  
 bi.hwndOwner=GetSafeHwnd(); ='eQh\T)  
 bi.pszDisplayName=name; pDr/8HEh  
 bi.lpszTitle="Select folder"; kbz+6LcV  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 2U+wiE|  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ,5*<C'9  
 if(idl==NULL) xWQQX  
  return; M _Lj5`  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); :oZ~&H5Q  
 str.ReleaseBuffer(); 0#ePg6n  
 m_Path=str; 3=L5Y/  
 if(str.GetAt(str.GetLength()-1)!='\\') fk5pPm|MiL  
  m_Path+="\\"; 0[Zs8oRiI  
 UpdateData(FALSE); "\afIYS I  
} J(,gLl  
:NwFJc  
void CCaptureDlg::SaveBmp() P]4u`&  
{ 14-uy.0[  
 CDC dc; BXl Y V"  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); zq^eL=%:  
 CBitmap bm; OOus*ooo2  
 int Width=GetSystemMetrics(SM_CXSCREEN); !Cm9DzG  
 int Height=GetSystemMetrics(SM_CYSCREEN); +{ e2TY  
 bm.CreateCompatibleBitmap(&dc,Width,Height); F JxH{N6a  
 CDC tdc; .ddf'$6h  
 tdc.CreateCompatibleDC(&dc); z{> )'A/  
 CBitmap*pOld=tdc.SelectObject(&bm); <e8Ux#x/  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 3AuLRI  
 tdc.SelectObject(pOld); L{6Vi&I84[  
 BITMAP btm; R /c-sV  
 bm.GetBitmap(&btm); Wzh#dO?7  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; QbAEW m  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); UD]RWN  
 BITMAPINFOHEADER bih; c30 kb  
 bih.biBitCount=btm.bmBitsPixel; *zPz)3;  
 bih.biClrImportant=0; 7tT L,Nxe  
 bih.biClrUsed=0; wAF#N1-k  
 bih.biCompression=0; r$d'[ZcX  
 bih.biHeight=btm.bmHeight; 6CWm;%B#G  
 bih.biPlanes=1; {1wjIo"ptg  
 bih.biSize=sizeof(BITMAPINFOHEADER); g>f_'7F&  
 bih.biSizeImage=size; :?gk =JH:  
 bih.biWidth=btm.bmWidth; Q;p% VQ  
 bih.biXPelsPerMeter=0; CM%;r5  
 bih.biYPelsPerMeter=0; +u7nx  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); K&vqk/JW1  
 static int filecount=0; %LdFS~  
 CString name; yD&UH_ 1g  
 name.Format("pict%04d.bmp",filecount++); AUkePp78  
 name=m_Path+name; ,?!4P+ob  
 BITMAPFILEHEADER bfh; G-T2b,J [  
 bfh.bfReserved1=bfh.bfReserved2=0; uchz<z1  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 3)py|W%X $  
 bfh.bfSize=54+size; qc^qCGy!z  
 bfh.bfOffBits=54; ATU]KL!{  
 CFile bf; !RdubM  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ %?:eURQ  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); =g^JJpS  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); {B6tGLt#bf  
  bf.WriteHuge(lpData,size); `OyYo^+D|.  
  bf.Close(); o>4GtvA*  
  nCount++; ?pF uV`Zm  
 } }W R?n  
 GlobalFreePtr(lpData); ;=ERm=  
 if(nCount==1) 3H/4$XJB  
  m_Number.Format("%d picture captured.",nCount); <Okl.Iz>  
 else P EAo'63$  
  m_Number.Format("%d pictures captured.",nCount); T .L>PL ?=  
  UpdateData(FALSE); #v4q:&yKf  
} lW YgIpw  
-jsk-,  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) m3K .\3  
{ j%s:d(H`  
 if(pMsg -> message == WM_KEYDOWN) Kkds^v6  
 { rv97Wm+  
  if(pMsg -> wParam == VK_ESCAPE) {5gh.  
   return TRUE; -r"h [UV)  
  if(pMsg -> wParam == VK_RETURN) W[tX%B  
   return TRUE; ::rKW *?  
 } -}*YfwK  
 return CDialog::PreTranslateMessage(pMsg); MXU8QVSY"  
} zz+[]G+"2m  
q--;5"=S  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) >NN&j#;x~  
{ r$Ck:Q}  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ < ekLL{/O'  
  SaveBmp(); |;_uN q9  
  return FALSE; okZDxg`6  
} 6o/!H  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ dg]: JU  
 CMenu pop; rYMHc@a9(  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); +gOv5Eno-  
 CMenu*pMenu=pop.GetSubMenu(0); :CAbGs:56  
 pMenu->SetDefaultItem(ID_EXITICON); [6Gb@jG  
 CPoint pt; 7$* O+bkn:  
 GetCursorPos(&pt); <jvSV5%  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); P 6|\ ^  
 if(id==ID_EXITICON) m2"~.iM8  
  DeleteIcon(); nXOJ  
 else if(id==ID_EXIT) Z6`[ dAo  
  OnCancel(); 2oFHP_HVfu  
 return FALSE; As7Y4w*+  
} mN:p=.& <  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ( AnM _s  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Xm2p<Xu8h  
 AddIcon(); UjU*`}k3  
 return res; 5b2_{6t  
} tk <R|i  
eO:wx.PW  
void CCaptureDlg::AddIcon() IZkQmA=  
{ ^/kn#1H7&  
 NOTIFYICONDATA data; qj5V<c;h%W  
 data.cbSize=sizeof(NOTIFYICONDATA); +MfdZD  
 CString tip; Sc zYL?w^  
 tip.LoadString(IDS_ICONTIP); GwoN=  
 data.hIcon=GetIcon(0); le-Q&*  
 data.hWnd=GetSafeHwnd(); 24 i00s|#  
 strcpy(data.szTip,tip); A<VNttgG  
 data.uCallbackMessage=IDM_SHELL; ,1+)qv#|i  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; f6h!wx  
 data.uID=98; [nam H a  
 Shell_NotifyIcon(NIM_ADD,&data); 5 5_#?vw  
 ShowWindow(SW_HIDE); ^sp+ sr :  
 bTray=TRUE; Z'vGX,:  
} ?x(]U+  
,NQucp  
void CCaptureDlg::DeleteIcon() lklMdsIdj  
{ jCMr[ G=  
 NOTIFYICONDATA data; CN$wlhs  
 data.cbSize=sizeof(NOTIFYICONDATA); ni@N/Z?!pA  
 data.hWnd=GetSafeHwnd(); U]Vu8$W  
 data.uID=98; *c+Kqz-  
 Shell_NotifyIcon(NIM_DELETE,&data); !Rzw[~  
 ShowWindow(SW_SHOW); 8)D5loS  
 SetForegroundWindow(); Xk_xTzJ  
 ShowWindow(SW_SHOWNORMAL); %!G]H   
 bTray=FALSE; XJ|CC.]1u  
} jQp7TdvLE$  
=~i~SG/f  
void CCaptureDlg::OnChange() _^<HlfOK  
{ pk*cc h#  
 RegisterHotkey(); R)3P"sGuN  
} rVx%"_'*-  
#mNM5(o  
BOOL CCaptureDlg::RegisterHotkey() i%8I (F  
{ w>:~Ev]  
 UpdateData(); ]e'Ol$3U9=  
 UCHAR mask=0; "?Eh_Dw  
 UCHAR key=0; n\#RI9#\  
 if(m_bControl) \/J7U|@Lt  
  mask|=4; yE(>R(^  
 if(m_bAlt) a+TlZE>8  
  mask|=2; pFLR!/J  
 if(m_bShift) 9~^%v zM  
  mask|=1; n y7 G  
  key=Key_Table[m_Key.GetCurSel()]; $W 46!U3  
 if(bRegistered){ J2BW>T!tuw  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); }2^_Gaj  
  bRegistered=FALSE; OA\2ja~+  
 } $DmWK_A  
 cMask=mask; <Q06<{]R8  
 cKey=key; (=d%Bn$6b  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); <m"yPi3TY  
 return bRegistered; MZGN,[~)6  
} {CM%QMM  
I@l' Fx  
  四、小结 $q]:m+Fm  
V=pg9KR!T  
  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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