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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: +LsACSB  
  3Ja1|;(2  
  一、实现方法 B`<K]ut  
?hS&OtW   
  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: c.eA]mq  
i-*ZW:  
#pragma data_seg("shareddata") %?z8*G]M  
HHOOK hHook =NULL; //钩子句柄 Ea\Khf]2  
UINT nHookCount =0; //挂接的程序数目 j$Z:S~*  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 `5C uH  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 x l4A<  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Pmj%QhOYE  
static int KeyCount =0; +1=]93gP  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 2Bg0 M  
#pragma data_seg() Y ]6kA5  
eT6T@C](  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 FA3YiX(-e  
!omf>CW;ud  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 9S]]KEGn4  
Cmj+>$')0  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Yb;$z'  
cKey,UCHAR cMask) XdxSi"+  
{ >qC,IQ'  
 BOOL bAdded=FALSE; $;%k:&\f  
 for(int index=0;index<MAX_KEY;index++){ Th>ff)~ e  
  if(hCallWnd[index]==0){ G"|`&r@  
   hCallWnd[index]=hWnd; lLi)?  
   HotKey[index]=cKey; K)[DA*W  
   HotKeyMask[index]=cMask; S{#L7S  
   bAdded=TRUE; K]c\3[vR  
   KeyCount++; 8*Ke;X~N  
   break; ].r~?9'/  
  } RJk42;]  
 } e'0BP,\f_}  
 return bAdded; Uon^z?0A  
} ?0J&U4  
//删除热键 -b$m<\0*  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 4(D/~OG-6  
{ rK} =<R  
 BOOL bRemoved=FALSE; " ';K$&,[  
 for(int index=0;index<MAX_KEY;index++){ *~SanL\  
  if(hCallWnd[index]==hWnd){ Q.Xs%{B  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ iw\yVd^]:k  
    hCallWnd[index]=NULL; 'K*. ?M  
    HotKey[index]=0; I)wc&>Lc  
    HotKeyMask[index]=0; BH\!yxK  
    bRemoved=TRUE; _-5|"oJ  
    KeyCount--; <b#1L  
    break; @Z2^smf  
   } o4F(X0  
  } zW9/[Db  
 } &ku.Q3xGs  
 return bRemoved; +nU=)x?38  
} 33z^Q`MTC  
IB\O[R$x  
!\Vc#dslt  
  DLL中的钩子函数如下: &\ $~  
g?E8zf `  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) F0x'^Z}Q;  
{ ^ZPynduR  
 BOOL bProcessed=FALSE; #bCQEhCy  
 if(HC_ACTION==nCode) 1=z6m7@'-  
 { z,xGjS P  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 :Fh#"<A&&  
   switch(wParam) l#bE_PD;  
   {  IC6r?  
    case VK_MENU: +*L<"@  
     MaskBits&=~ALTBIT; k$3Iv"gbx  
     break; dwJnPJ=z  
    case VK_CONTROL: </]a`h]  
     MaskBits&=~CTRLBIT; y/>IF|aX  
     break; uF<}zFS  
    case VK_SHIFT: x@#aOf4<U  
     MaskBits&=~SHIFTBIT; nAaY5s0D  
     break; xVN(It7g  
    default: //judge the key and send message buKSZ  
     break; ]e6$ ={  
   } Q4ZKgcC  
   for(int index=0;index<MAX_KEY;index++){ 8@,8j!$8G  
    if(hCallWnd[index]==NULL) s((c@)M  
     continue; ,s`4k?y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <%?!3 n*  
    { c"lblt5  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 4t,f$zk  
     bProcessed=TRUE; _qa9wK/  
    } |'qvq/#^  
   } /(8"9Sfm  
  } :Lu 9w0>f  
  else if((lParam&0xc000ffff)==1){ //有键按下 R4vf  
   switch(wParam) YHzP/&0  
   { (tvfF0~  
    case VK_MENU: (lg~}Jwq  
     MaskBits|=ALTBIT; ~@mNR^W-W  
     break; Qv6-,6<  
    case VK_CONTROL: ; ,n}>iTE  
     MaskBits|=CTRLBIT; ]w_JbFmT  
     break; xSrjN  
    case VK_SHIFT: 7:e5l19 uI  
     MaskBits|=SHIFTBIT; hip't@.uE  
     break; %l[]n;*$  
    default: //judge the key and send message sA2esA@C<o  
     break; W:>XXUU  
   } yT|44 D2j  
   for(int index=0;index<MAX_KEY;index++){ N qS]dH61  
    if(hCallWnd[index]==NULL) r;_*.|AH  
     continue; TeRH@oI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _$_,r H  
    { ,H>'1~q  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); mO2u9?N  
     bProcessed=TRUE; _ %G;^ b  
    } ~S\8 '  
   } 5a&BgBO1M  
  } zl<D"eP  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 <:4b4Nl  
   for(int index=0;index<MAX_KEY;index++){ SZvp %hS0  
    if(hCallWnd[index]==NULL) ipyc(u6Z5  
     continue; CsEU:v  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) A|YiSwyy  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); _*ar\A`  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 XhUVDmeUMb  
   } gg/2R?O]  
  } :.u2^*<  
 } HCT+.n6  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); u#UtPF7q  
} .uSVZqJ7  
?x/Lb*a^  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: Va[t'%~&zR  
fp}5QUm-  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); QmMA]Q  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); yz"hU  
5mX^{V&^  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: YC(X= D  
wxJoWbn  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ,Xxp]*K2  
{ .}Eckqkp  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 6O_l;A[=1  
 { NOmFQ)/ &  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 nNf*Q r%Z  
  SaveBmp(); _nM 7SK  
  return FALSE; Hk'R!X  
 } 3YG%YhevO  
 …… //其它处理及默认处理 "RTv[n!  
} q07H{{h/B  
a"l\_D'.K8  
yKy )%i  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 "7eL&  
7AlL,&+  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 dQ_hlx!J  
(|>rDk;  
  二、编程步骤 -A@/cS%p  
Tgl >  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; PS8^=  
V|~o`(]  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; U>sEFzBup  
eD8e0 D'S  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; |{JI=$  
|w+ O.%=  
  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; OZA^L;#>  
V"B/4v>  
  5、 添加代码,编译运行程序。 qeb}~FL"o  
C-\3,  
三、程序代码 &8I }q]'k  
SLRF\mh!L  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL AiB]A}  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) *Nfot v  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ (\'$$  
#if _MSC_VER > 1000 zp5ZZcj_  
#pragma once o=6 <?v7  
#endif // _MSC_VER > 1000 e]5NA?2j  
#ifndef __AFXWIN_H__ F]fXS-@ c  
#error include 'stdafx.h' before including this file for PCH z,bK.KFSs  
#endif ym+Ezb#o  
#include "resource.h" // main symbols G;d3.ml/aZ  
class CHookApp : public CWinApp ~nb(e$?N  
{ SSq4KFO1  
 public: T0~~0G)k  
  CHookApp(); ZtmaV27s/  
  // Overrides 'Yi="kno  
  // ClassWizard generated virtual function overrides W23Q>x&S  
  //{{AFX_VIRTUAL(CHookApp) Te`@{>  
 public: [jksOC)@4  
  virtual BOOL InitInstance(); 9s*QHCB0  
  virtual int ExitInstance(); T Y% =Y=  
  //}}AFX_VIRTUAL B3pjli  
  //{{AFX_MSG(CHookApp) $N Mu  
  // NOTE - the ClassWizard will add and remove member functions here. _90<*{bt.  
  // DO NOT EDIT what you see in these blocks of generated code ! `<kB/T  
  //}}AFX_MSG Lz!JLiMEET  
  DECLARE_MESSAGE_MAP() @|5B}%!  
}; #d06wYz=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); uEf=Vj}G  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 3 q J00A  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); xkU8(=  
BOOL InitHotkey(); Y`#6MhFT7  
BOOL UnInit(); {3.n!7+  
#endif CRD=7\0(D+  
(G/(w%#7_  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. R>]7l!3^1  
#include "stdafx.h" z~==7:Os  
#include "hook.h" D/JSIDd  
#include <windowsx.h> }+Q4s]  
#ifdef _DEBUG b^&azUkMN  
#define new DEBUG_NEW bWSc&/ 9y  
#undef THIS_FILE 9 )!}  
static char THIS_FILE[] = __FILE__; |28'<BL  
#endif ,i Y:#E  
#define MAX_KEY 100 [$pb  
#define CTRLBIT 0x04 jD%|@ux  
#define ALTBIT 0x02 \<\H1;=.@'  
#define SHIFTBIT 0x01 &]GR*a  
#pragma data_seg("shareddata") *X{7m]5  
HHOOK hHook =NULL; 1)jea wVmj  
UINT nHookCount =0; KVr9kcs  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey l~w^I|M^C  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT seRf q&  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey T?QW$cU!e:  
static int KeyCount =0; @56*r@4:q  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 6yO5{._M  
#pragma data_seg() {M7`"+~w  
HINSTANCE hins; .6LRg  
void VerifyWindow(); 5 ba e-  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) >MSK.SNh  
//{{AFX_MSG_MAP(CHookApp) >*opEI+  
// NOTE - the ClassWizard will add and remove mapping macros here. 9D Nd} rXO  
// DO NOT EDIT what you see in these blocks of generated code! (wuciKQ  
//}}AFX_MSG_MAP NbTaI{r  
END_MESSAGE_MAP() V.*y_=i8t  
^< ;C IXo  
CHookApp::CHookApp() EpQy;#=;  
{ :WX OD  
 // TODO: add construction code here, j*[P\Cm  
 // Place all significant initialization in InitInstance v+[S${  
} (z.n9lkfi  
ZNM9@;7  
CHookApp theApp; G;iH.rCH  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) TET=>6  
{ W$2 \GPJt  
 BOOL bProcessed=FALSE; 2K{'F1"RM  
 if(HC_ACTION==nCode) F\^8k/0  
 { SDV#p];u  
  if((lParam&0xc0000000)==0xc0000000){// Key up LMx/0  
   switch(wParam) l2:-).7xt  
   { 9P)!v.,T/  
    case VK_MENU: g1}:;VG=  
     MaskBits&=~ALTBIT; 'RhS%l  
     break; #z _<{' P"  
    case VK_CONTROL: x;$ESPPg  
     MaskBits&=~CTRLBIT; 9<&M~(dwT4  
     break; JqZt1um  
    case VK_SHIFT: M. % p'^5  
     MaskBits&=~SHIFTBIT; $5.52  
     break; @/ |g|4  
    default: //judge the key and send message <#4""FO*  
     break; -CuuO=h  
   } y`L.#5T  
   for(int index=0;index<MAX_KEY;index++){ F[SZwMf29  
    if(hCallWnd[index]==NULL) '|Bk}pl7  
     continue; :Yn.Wv-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) U._fb=  
    { W]DGt|JP  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); LU+SuVm  
     bProcessed=TRUE; Bpm COA  
    } WW{_D  
   } '*65j  
  } O39   
  else if((lParam&0xc000ffff)==1){ //Key down s~2o<#  
   switch(wParam) 7<*0fy5nn  
   { 1^*ogMe  
    case VK_MENU: LAo$AiTUR{  
     MaskBits|=ALTBIT; D!! B4zt  
     break; yYYP;N?g4k  
    case VK_CONTROL: ib#rT{e  
     MaskBits|=CTRLBIT; KXDnhV f  
     break; 0%%U7GFB5  
    case VK_SHIFT: nW"O+s3  
     MaskBits|=SHIFTBIT; VevG 64o  
     break; K-)!d$$   
    default: //judge the key and send message gd]S;<Jh  
     break; HcJ!(  
   } Q~qM;l\i  
   for(int index=0;index<MAX_KEY;index++) pfHjs3A=  
   { y< j7iN  
    if(hCallWnd[index]==NULL) wK7w[Xt  
     continue; j5" L  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) y0(.6HI  
    { G4*&9Wo  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ^)Awjj9  
     bProcessed=TRUE; Yl>Y.SO  
    } _u^3uzu  
   } m"/..&'GC  
  } gaz",kK<  
  if(!bProcessed){ :Ae#+([V  
   for(int index=0;index<MAX_KEY;index++){ `^[Tu 1  
    if(hCallWnd[index]==NULL) {<@ud0A:\  
     continue; JDZuT#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ?A7 AVR  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); -,+C*|mu  
   } m//aAxmB  
  } &V$cwB  
 } h&CZN !  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 8y<.yfgG  
} A+8)VlE\  
"qF/7`e[  
BOOL InitHotkey() 2 G2+oS ?  
{ \A01 1R&  
 if(hHook!=NULL){ B }euIQB  
  nHookCount++; F nXm;k,9*  
  return TRUE; uA[ :  
 } TP {\V>*Yz  
 else CEkUXsp  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); RV_I&HD!  
  if(hHook!=NULL) 2( 0%{*m  
   nHookCount++; 1E / G+pm  
  return (hHook!=NULL); 1uN;JN `_  
} (}6\_k[}m  
BOOL UnInit() X,aRL6>r  
{ 6`Y:f[VB  
 if(nHookCount>1){ }Vob)r{R@  
  nHookCount--; HVoP J!K3  
  return TRUE; )Jk$j  
 } "5<!   
 BOOL unhooked = UnhookWindowsHookEx(hHook); n nAtXVy  
 if(unhooked==TRUE){ 035jU'  
  nHookCount=0; YR0AI l:L  
  hHook=NULL; o*/;Zp==  
 } au+Jz_$)  
 return unhooked; 95~bM;T Vr  
} SO *oBA'  
m4oj1h_4  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) tmq?h%O>  
{ y[85eM  
 BOOL bAdded=FALSE; qQ^CSn98J  
 for(int index=0;index<MAX_KEY;index++){ =|aZNHqH  
  if(hCallWnd[index]==0){ `<d.I%}  
   hCallWnd[index]=hWnd; G^nG^HTo5  
   HotKey[index]=cKey; ^gx~{9`RR  
   HotKeyMask[index]=cMask; xBc|rqge  
   bAdded=TRUE; -O?HfQ  
   KeyCount++; n/(}|xYU  
   break; N8At N\e  
  } IMbF]6%p(  
 } 5o 5DG  
 return bAdded; %n9ukc~$p  
} "GZ}+K*GG  
 %V ]v,  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) sV2D:%\K:  
{ L5 Cfa-  
 BOOL bRemoved=FALSE; i"iy 0 ?  
 for(int index=0;index<MAX_KEY;index++){ "1^tVw|  
  if(hCallWnd[index]==hWnd){ $Ugc:L<h+  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ #~/9cVm$  
    hCallWnd[index]=NULL; (0Br`%!F  
    HotKey[index]=0; C=r`\W  
    HotKeyMask[index]=0; X41Qkf{  
    bRemoved=TRUE;  <a $!S  
    KeyCount--; N}%AUm/L  
    break; *j]Bo,AC  
   } AQ(n?1LU  
  } 2IW!EUR  
 } WvT H+  
 return bRemoved; +g7]ga  
} ?+7~ E8  
S@3`H8 [  
void VerifyWindow() 4(P<'FK $  
{ F*#!hWtb  
 for(int i=0;i<MAX_KEY;i++){ mMXDzAllB  
  if(hCallWnd!=NULL){ ]zyT_}&  
   if(!IsWindow(hCallWnd)){ AN:s%w2  
    hCallWnd=NULL; f/8&-L  
    HotKey=0; @]#[TbNo  
    HotKeyMask=0; 0aY\(@  
    KeyCount--; cq?,v?m  
   } &l ]F&-  
  } +u=VO#IA#  
 } AEnkx!o  
} KG(FA  
VT4 >6u}  
BOOL CHookApp::InitInstance() E"p _!!1  
{ H/M]YUs/3  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); tlD^"eq4:  
 hins=AfxGetInstanceHandle(); 5<`83; R9  
 InitHotkey(); qzvht4  
 return CWinApp::InitInstance(); QeFt WjlqC  
} FO[ s;dmzu  
4Ol1T(J#  
int CHookApp::ExitInstance() Hs8JJGXWB  
{ 6c(b*o  
 VerifyWindow(); *rw6?u9I  
 UnInit(); LlgFQfu8  
 return CWinApp::ExitInstance(); . G25D  
} w=!xTA  
6l2O>V  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file QQN6\(;-  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) +ug2p;<B  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ k=kkF"  
#if _MSC_VER > 1000 =s*c(>  
#pragma once G7`mK}J7  
#endif // _MSC_VER > 1000 J5jI/P  
6p&2 A  
class CCaptureDlg : public CDialog (z)#}TC  
{ @8m%*pBg  
 // Construction =to.Oa RR  
 public: p|nPu*R-\  
  BOOL bTray; U_'M9g{,<  
  BOOL bRegistered; OhN2FkxL  
  BOOL RegisterHotkey(); Ws0)B8y,|  
  UCHAR cKey; ,.2qh|Ol  
  UCHAR cMask; &g90q   
  void DeleteIcon(); DVwB}W~  
  void AddIcon(); g.!k>_g`  
  UINT nCount; PB"=\>]`N  
  void SaveBmp(); P8h|2,c%  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor JBHPI@Qt%  
  // Dialog Data @>$qb|j  
  //{{AFX_DATA(CCaptureDlg) O86p]Lr  
  enum { IDD = IDD_CAPTURE_DIALOG }; `?[,1   
  CComboBox m_Key; p ]jLs|tat  
  BOOL m_bControl; n05GM.|*s  
  BOOL m_bAlt; A9]& w  
  BOOL m_bShift; _]ZlGq!L  
  CString m_Path; J Bq6Qg  
  CString m_Number; 'J0I$-QYk  
  //}}AFX_DATA J,:;\Xhl  
  // ClassWizard generated virtual function overrides CF-tod  
  //{{AFX_VIRTUAL(CCaptureDlg) l?_Fy_fBt  
 public: rrEf<A}  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 8EJP~bt  
 protected: /DHV-L  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support L1G)/Vkw  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ADOA&r[  
  //}}AFX_VIRTUAL A2L"&dl  
  // Implementation ?-2s}IJO  
 protected: tK uJ &I~  
  HICON m_hIcon; ~@Bw(!  
  // Generated message map functions  `5(F'o  
  //{{AFX_MSG(CCaptureDlg) Yc6.v8a  
  virtual BOOL OnInitDialog(); u.n'dF-  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); S?JGg.)  
  afx_msg void OnPaint(); vN_ 8qzWk  
  afx_msg HCURSOR OnQueryDragIcon(); *fj]L?,  
  virtual void OnCancel(); YZ:C9:S6X  
  afx_msg void OnAbout(); m}D;=>2$  
  afx_msg void OnBrowse(); Q;z!]hjBM  
  afx_msg void OnChange(); {0a\<l  
 //}}AFX_MSG Vh=U/{Rp1  
 DECLARE_MESSAGE_MAP() Ylu\]pr9|C  
}; 8BZ&-j{  
#endif xj8z*fC;  
qgfP6W$  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file !fe_w5S^  
#include "stdafx.h" @^ &p$:  
#include "Capture.h" Z;1r=p#s  
#include "CaptureDlg.h" H0])>1sWB  
#include <windowsx.h> P'}B5 I~  
#pragma comment(lib,"hook.lib") p{ZyC  
#ifdef _DEBUG @T L|\T  
#define new DEBUG_NEW Qa:[iF  
#undef THIS_FILE #U w X~  
static char THIS_FILE[] = __FILE__; "LkBN0D  
#endif ]o=ON95ja  
#define IDM_SHELL WM_USER+1 :/$_eg0A  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); <ty]z!B  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); j+ L:Ao  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; {' 0#<Z  
class CAboutDlg : public CDialog ?VRsgV'$  
{ ]2|fc5G'  
 public: 4e|N^h*!  
  CAboutDlg(); {SXSQ'=  
  // Dialog Data ^\`a-l^  
  //{{AFX_DATA(CAboutDlg) b3 =Z~iLv  
  enum { IDD = IDD_ABOUTBOX }; [MbbL  
  //}}AFX_DATA +kE~OdZG  
  // ClassWizard generated virtual function overrides (G{S*+  
  //{{AFX_VIRTUAL(CAboutDlg) 8* #$ 3e  
 protected: Bv jsl  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Eld[z{n"  
  //}}AFX_VIRTUAL l.g.O>1   
  // Implementation \Z42EnJ  
 protected: `[}X_d 1A  
  //{{AFX_MSG(CAboutDlg) .Oc j|A6  
  //}}AFX_MSG Wuk8&P3  
  DECLARE_MESSAGE_MAP() L$);50E  
}; |`o1B;lc  
w8UUeF  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) t18j2P>`  
{ 3< 6h~ek )  
 //{{AFX_DATA_INIT(CAboutDlg) 6:; >id${  
 //}}AFX_DATA_INIT LCj3{>{/=  
} .GNyA DQp  
'PFjZGaKR  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) q`L )^In"  
{ Qmo}esb'(  
 CDialog::DoDataExchange(pDX); 2T(+VeMQ=  
 //{{AFX_DATA_MAP(CAboutDlg) 3}mg7KV&  
 //}}AFX_DATA_MAP jgPUR#)  
} M?}:N_9<J  
Oi^cs=}  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ibwV #6  
 //{{AFX_MSG_MAP(CAboutDlg) 1HAnOy0   
 // No message handlers {5c?_U  
 //}}AFX_MSG_MAP  !=*8*?@  
END_MESSAGE_MAP() C$C>RYE?.  
[Y, L=p  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 7j=KiiI  
: CDialog(CCaptureDlg::IDD, pParent) _&s pMf  
{ 9c,/490Q  
 //{{AFX_DATA_INIT(CCaptureDlg) ,~1k:>njY~  
  m_bControl = FALSE; 6P>}7R}  
  m_bAlt = FALSE; M&faa7  
  m_bShift = FALSE; emrA!<w!W  
  m_Path = _T("c:\\"); VMJaL}J]  
  m_Number = _T("0 picture captured."); k%O3\q  
  nCount=0; QE)zH)(  
  bRegistered=FALSE; ;]>)6  
  bTray=FALSE; ]W2#8:i  
 //}}AFX_DATA_INIT z8{-I@+`  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 @^ -Y&N!b=  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); (/]#G8  
} CP%^)LX *  
4~FRE)8  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) $>yfu=]?  
{ % C2Vga#  
 CDialog::DoDataExchange(pDX); NR k~  
 //{{AFX_DATA_MAP(CCaptureDlg) d-tg^Ot#  
  DDX_Control(pDX, IDC_KEY, m_Key); ,t wB" *  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); L1(-xNUo_i  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ^_P?EJ,)`  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Qf ~$9?z  
  DDX_Text(pDX, IDC_PATH, m_Path); z;<~j=lP  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 9Sd?,z  
 //}}AFX_DATA_MAP );t+~YPS  
} CqZHs 9+e&  
i+~BVb  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 2?Jw0Wq5D  
//{{AFX_MSG_MAP(CCaptureDlg) .S/zxf~h  
 ON_WM_SYSCOMMAND() 0}`-vOLd-  
 ON_WM_PAINT() m}RZ )c  
 ON_WM_QUERYDRAGICON() Z~-N'Lt{  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Y(kf<Wo  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) > .K%W *t  
 ON_BN_CLICKED(ID_CHANGE, OnChange) P\6:euI  
//}}AFX_MSG_MAP a9{NAyl<oo  
END_MESSAGE_MAP() es#6/  
7'i{JPm  
BOOL CCaptureDlg::OnInitDialog() z,SI  
{ 5n}<V-yJ*m  
 CDialog::OnInitDialog(); {y6h(@I8\  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 4\v &8">LL  
 ASSERT(IDM_ABOUTBOX < 0xF000); AgSAjBP  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 62_k`)k  
 if (pSysMenu != NULL) =*lBJ-L  
 { CyYr5 Dz  
  CString strAboutMenu; S1y6G/e9  
  strAboutMenu.LoadString(IDS_ABOUTBOX); /Qr`au  
  if (!strAboutMenu.IsEmpty()) I{[Z  
  { 2YW;=n  
   pSysMenu->AppendMenu(MF_SEPARATOR); vGh>1U:  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 2/s42 FoG  
  } Jkbeh.  
 } 'plUs<A  
 SetIcon(m_hIcon, TRUE); // Set big icon vWeY[>oGur  
 SetIcon(m_hIcon, FALSE); // Set small icon #(Gz?kGAH`  
 m_Key.SetCurSel(0); *xsBFCRU  
 RegisterHotkey(); p!uB8F  
 CMenu* pMenu=GetSystemMenu(FALSE); rEj[XK  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); c};%VB  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Z/?{{}H+  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); \( {'Xo >(  
 return TRUE; // return TRUE unless you set the focus to a control U1) Zh-aR  
} OM\1TD/-  
S-gO  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) {dpDQP +!  
{ sHk>ek]2I  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX)   P3|s}&  
 { 0!lWxS0#=  
  CAboutDlg dlgAbout; !Pnjr T  
  dlgAbout.DoModal(); ! {G0'   
 } l}VE8-XB  
 else 3Zd,"/RH  
 { zN[& iKf  
  CDialog::OnSysCommand(nID, lParam); ,z/aT6M?H  
 } E/%"%&`8j  
} YT(Eh3ID  
C]5 kQ1Og  
void CCaptureDlg::OnPaint() kV?fie<\)  
{ Bz-jy.  
 if (IsIconic()) ^w~B]*A :"  
 { H~Vf;k>  
  CPaintDC dc(this); // device context for painting 6V JudNA  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); $'Mf$h  
  // Center icon in client rectangle ;2 &"  
  int cxIcon = GetSystemMetrics(SM_CXICON); +#BOWz  
  int cyIcon = GetSystemMetrics(SM_CYICON); ^ `Ozw^~  
  CRect rect; t&{;6MiE  
  GetClientRect(&rect); \-;f<%+  
  int x = (rect.Width() - cxIcon + 1) / 2; GVnDN~[  
  int y = (rect.Height() - cyIcon + 1) / 2; X`Q+,tx$  
  // Draw the icon I(pq3_9$  
  dc.DrawIcon(x, y, m_hIcon); x@rQ7K>  
 } , %z HykP  
 else D0p*Sg  
 { wv{ Qx^  
  CDialog::OnPaint(); C2v_] ,]  
 } !.mR]El{K  
} !aF~5P7%  
V27RK-.N!  
HCURSOR CCaptureDlg::OnQueryDragIcon() S}%z0g<  
{ +c<iVc|  
 return (HCURSOR) m_hIcon; r\ft{Z<P  
} /ugyUpyg  
HFy9b|pjy  
void CCaptureDlg::OnCancel() 1r$-Uh  
{ iUR ij@  
 if(bTray) wT" :  
  DeleteIcon(); a!:N C  
  CDialog::OnCancel(); V)/J2-w  
} ,/b!Xm:  
0@cIj ]  
void CCaptureDlg::OnAbout() pIcg+~  
{ qNj?Rwc  
 CAboutDlg dlg; 13 #ff  
 dlg.DoModal(); ;Hk3y+&]a  
} (wZ!OLY%}  
qovsM M  
void CCaptureDlg::OnBrowse() rn*'[i?  
{ U0j>u*yE  
 CString str; qD>^aEd@4  
 BROWSEINFO bi; mXyP;k  
 char name[MAX_PATH]; YWH>tt 9  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ;NRh0)%|o  
 bi.hwndOwner=GetSafeHwnd(); [C6ba{9 B  
 bi.pszDisplayName=name; n Ab~  
 bi.lpszTitle="Select folder"; C&w0HoF  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; &F~d~;G"q  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); o(jLirnk  
 if(idl==NULL) \vT~2Y(K  
  return; z&d.YO_W  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); iVZ}+Ct<"  
 str.ReleaseBuffer(); xE?KJ  
 m_Path=str; zs#-E_^%M  
 if(str.GetAt(str.GetLength()-1)!='\\') e3;D1@  
  m_Path+="\\"; W$zRUG-  
 UpdateData(FALSE); xo'!$a}I2  
} |@JTSz*Or  
x0Loid\f  
void CCaptureDlg::SaveBmp() lF!PiL  
{ "V]*ov&[  
 CDC dc; z f SE7i0  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); mk1R~4v  
 CBitmap bm; m1%rm-M  
 int Width=GetSystemMetrics(SM_CXSCREEN); Yt(FSb31H  
 int Height=GetSystemMetrics(SM_CYSCREEN); E! NtD).=S  
 bm.CreateCompatibleBitmap(&dc,Width,Height); hp'oiR;~w  
 CDC tdc; ,R`CAf%*  
 tdc.CreateCompatibleDC(&dc); xc}[q`vK  
 CBitmap*pOld=tdc.SelectObject(&bm); lUEbxN  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Nz`8)Le  
 tdc.SelectObject(pOld); "crR{OjE"  
 BITMAP btm; T/P\j0hR  
 bm.GetBitmap(&btm); q\o#<'F1J  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; /OztkThx=  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); S#C-j D  
 BITMAPINFOHEADER bih; E72N=7v"  
 bih.biBitCount=btm.bmBitsPixel; tz;o6,eb  
 bih.biClrImportant=0; F7JO/U^oU  
 bih.biClrUsed=0; 6L8nw+mEK  
 bih.biCompression=0; %MHL@Nn>e  
 bih.biHeight=btm.bmHeight; 9S]pC?N]E  
 bih.biPlanes=1; U U_0@V<  
 bih.biSize=sizeof(BITMAPINFOHEADER); / =6_2t#vA  
 bih.biSizeImage=size; qco'neR"z  
 bih.biWidth=btm.bmWidth; # atq7t X  
 bih.biXPelsPerMeter=0; >]~581fYf  
 bih.biYPelsPerMeter=0; Y0,{fw<  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 1sj7]G]`k  
 static int filecount=0; *b) (-#w3  
 CString name; $GRwk>N  
 name.Format("pict%04d.bmp",filecount++); 2PSExK57  
 name=m_Path+name; Vp]7n!g4l  
 BITMAPFILEHEADER bfh; j? BL8E'   
 bfh.bfReserved1=bfh.bfReserved2=0; Q*#Lr4cm{  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ON\bD?(VY  
 bfh.bfSize=54+size; $EFS_*<X  
 bfh.bfOffBits=54; i;%G Z8  
 CFile bf; ! I?C8)  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 2: gh q  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); -"nkC  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); IwnDG;+Ap  
  bf.WriteHuge(lpData,size); S,:!H@~B  
  bf.Close(); 1w7tRw  
  nCount++; }kmAUaa,Z  
 } cF15Mm2  
 GlobalFreePtr(lpData); I*a@_EO  
 if(nCount==1) #(614-r/  
  m_Number.Format("%d picture captured.",nCount); ?fy37m(M}  
 else /K li C\  
  m_Number.Format("%d pictures captured.",nCount); O oA!N-Q  
  UpdateData(FALSE); cN&Ebn  
} G>vK$W$f N  
*$0*5d7  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) n}Z%D-b$  
{ [ft6xI  
 if(pMsg -> message == WM_KEYDOWN) akbB=:M,x  
 { 2K>1,[C'Z  
  if(pMsg -> wParam == VK_ESCAPE) n`Pl:L*kG  
   return TRUE; Q.B)?wm  
  if(pMsg -> wParam == VK_RETURN) ),N,!15j,  
   return TRUE; %W D^0U|  
 } h<&GdK2U+  
 return CDialog::PreTranslateMessage(pMsg); )Q`Ycz-  
} /a32QuS  
G$Mf(S'f  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) (k!7`<k!Y  
{ tdRvg7v,N%  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ L3I$ K+c  
  SaveBmp(); F*U(Wl=  
  return FALSE; }b54O\,  
} OlyW/hd  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ~F-knEvL  
 CMenu pop; #>aq'47j  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); +g?uvXC&  
 CMenu*pMenu=pop.GetSubMenu(0); > .NLmzUX  
 pMenu->SetDefaultItem(ID_EXITICON); e+BZoK ^  
 CPoint pt; Z OPK  
 GetCursorPos(&pt); I=&i &6v8G  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); H3$py|}lL  
 if(id==ID_EXITICON) A!!!7tj  
  DeleteIcon(); xT&~{,9  
 else if(id==ID_EXIT) 3mU~G}ig  
  OnCancel(); hev;M)t  
 return FALSE; $rW(*#C  
} k ?KJ8  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ( xooU 8d  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) X9?)P5h=  
 AddIcon(); MUl7o@{'  
 return res; e]1'D  
} o7E|wS  
P,pC Z+H  
void CCaptureDlg::AddIcon() '-A;B.GV%  
{ {?lndBP<  
 NOTIFYICONDATA data; z**2-4 z  
 data.cbSize=sizeof(NOTIFYICONDATA); (mP{A(kwJ  
 CString tip; |1CX?8)b=  
 tip.LoadString(IDS_ICONTIP); n yPeN?-  
 data.hIcon=GetIcon(0); rGNa[1{kRs  
 data.hWnd=GetSafeHwnd(); rAP="H<  
 strcpy(data.szTip,tip); h9 DUS,G9,  
 data.uCallbackMessage=IDM_SHELL; {K+f& 75  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; %]7 6u7b/  
 data.uID=98; K!\v ?WbF  
 Shell_NotifyIcon(NIM_ADD,&data); FW8Zpr!u  
 ShowWindow(SW_HIDE); 8?LT*>!  
 bTray=TRUE; 2Pm}wD^`  
} TsT5BC63  
39O rY  
void CCaptureDlg::DeleteIcon() G8vDy1`q6  
{ G 3U[)("  
 NOTIFYICONDATA data; X[ Ufq^fyA  
 data.cbSize=sizeof(NOTIFYICONDATA); /v9qrZ$$  
 data.hWnd=GetSafeHwnd(); j|pTbOgk%  
 data.uID=98; TO G4=y-N  
 Shell_NotifyIcon(NIM_DELETE,&data); ?`e@ o?  
 ShowWindow(SW_SHOW); GFLat  
 SetForegroundWindow(); a6 vej  
 ShowWindow(SW_SHOWNORMAL); _ab8z]H   
 bTray=FALSE; iwM xTty  
} A'`F Rx(  
F<{,W-my `  
void CCaptureDlg::OnChange() Az y`4  
{ .g}N@  
 RegisterHotkey(); BNJ0D  
} Z:^#9D{  
(rhlK} C  
BOOL CCaptureDlg::RegisterHotkey() o}QP+  
{ eZa7brC|  
 UpdateData(); V5$ Gb6?K  
 UCHAR mask=0; plPPf+\  
 UCHAR key=0; J|{50?S{^  
 if(m_bControl)  t* Ct*  
  mask|=4; )rP,+B?W  
 if(m_bAlt) ^cNuEF9  
  mask|=2; rM.Pc?Z  
 if(m_bShift) _fZec+oM  
  mask|=1; h(yFr/  
  key=Key_Table[m_Key.GetCurSel()]; hK)'dG*  
 if(bRegistered){ 3}s]F/e  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); L }{3_/t  
  bRegistered=FALSE; "{vWdY|"  
 } wG MhKZE  
 cMask=mask; qvu1u GCc  
 cKey=key; v)*MgfS  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ?3K~4-!? /  
 return bRegistered; $\*Z   
} glCpA$;VPu  
az![u)  
  四、小结 }=v4(M`%  
py7Zh%k  
  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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