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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: Rh=h{O  
  Vh&uSi1V  
  一、实现方法 q45n.A6a  
z8o Sh t`+  
  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: ;.iy{&$  
Px<;-H`  
#pragma data_seg("shareddata") %\A~w3E  
HHOOK hHook =NULL; //钩子句柄 ?1YK-T@  
UINT nHookCount =0; //挂接的程序数目 e.N#+  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 BsJClKp/  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 uZfo[_g0S  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey W|:WAxJ*d  
static int KeyCount =0; Q]8r72uSk  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 U-@\V1;C  
#pragma data_seg() fIu/*PFPVY  
u7S7lR"lxW  
  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(6%U  
2n\EZ  
  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'SnqJ&}  
dQ<EDtap  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR l{<@[foc  
cKey,UCHAR cMask) u!O)\m-  
{ +:b| I'S  
 BOOL bAdded=FALSE; hGsY u)  
 for(int index=0;index<MAX_KEY;index++){ {J[0UZ6  
  if(hCallWnd[index]==0){ k{; 2*6b0  
   hCallWnd[index]=hWnd; 37VSE@Z+  
   HotKey[index]=cKey; Na4\)({  
   HotKeyMask[index]=cMask; #(OL!B  
   bAdded=TRUE; bS*9eX=K  
   KeyCount++; 8"+Kz  
   break; L!\I>a5C0G  
  } cG.4%Va@s_  
 } #jQITS7  
 return bAdded; lyP<&<Y5  
} RJ`F2b sYN  
//删除热键 SJ<nAX  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 0L'h5i>H)  
{ O[!]/qP+.  
 BOOL bRemoved=FALSE; HJDM\j*5  
 for(int index=0;index<MAX_KEY;index++){ )gZ yW  
  if(hCallWnd[index]==hWnd){ ]'hz+V31%  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ zFlW\wc  
    hCallWnd[index]=NULL; D_g+O"];P  
    HotKey[index]=0; ]`LMy t0  
    HotKeyMask[index]=0; -{^Gzui  
    bRemoved=TRUE; vForj*Xo  
    KeyCount--; cY5h6+_  
    break; <%! EI@N  
   } {Wt=NI?Ow  
  }  [5H#ay  
 } m}rUc29cS,  
 return bRemoved; rAgb<D@,H  
} 6]M(ElV1H  
l2i[wc"9  
Pwf":U)  
  DLL中的钩子函数如下: " 5=Gu1  
^]K_k7`I  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ,#nyEE  
{ Zv-#v  
 BOOL bProcessed=FALSE; q.*k J/L  
 if(HC_ACTION==nCode) (<|,LagTuc  
 { 3:s!0ty"  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 *~cq (PFQ  
   switch(wParam) O.i.<VD7  
   {  C1hp2CW$5/  
    case VK_MENU: 0`:0m/fsU  
     MaskBits&=~ALTBIT; NbH;@R)L  
     break; arm26YA-,  
    case VK_CONTROL: X-=49)  
     MaskBits&=~CTRLBIT; o!:   
     break; K1Mn_)%  
    case VK_SHIFT: y-9Mm9J  
     MaskBits&=~SHIFTBIT; 12.|Ed*72  
     break; *y0TtEd;  
    default: //judge the key and send message 05Ak[OOU>  
     break; f-^JI*hj  
   } _vm~yKId  
   for(int index=0;index<MAX_KEY;index++){ J.$N<.  
    if(hCallWnd[index]==NULL) EjrK.|I0  
     continue; W|4:3 c4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) R10R,*6>  
    { ;O+= 6>W  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); nH_M#  
     bProcessed=TRUE; )1N~-VuT  
    } Dr)B0]KG  
   } 7*.nd  
  } h:xvnyaI  
  else if((lParam&0xc000ffff)==1){ //有键按下 /@ m]@  
   switch(wParam) -V7dSi  
   { z#m ~}  
    case VK_MENU: wt]onve}%  
     MaskBits|=ALTBIT; UyENzK<%u  
     break; ~ 6DaM!  
    case VK_CONTROL: &sJ-&7YZ  
     MaskBits|=CTRLBIT; mb,\wZ  
     break; vhvFBx0  
    case VK_SHIFT: %py3fzg  
     MaskBits|=SHIFTBIT; ~wvu7  
     break; 6/6M.p  
    default: //judge the key and send message ]jjHIFX  
     break; zc K`hS  
   } *PM#ngLX}r  
   for(int index=0;index<MAX_KEY;index++){ }]<0!q &xB  
    if(hCallWnd[index]==NULL)  4 Fl>XM  
     continue; ]Q$Sei5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) }p5_JXBV  
    { !Ah v07SI  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); )Vd^#p  
     bProcessed=TRUE; LGB}:;$AL  
    } c^3,e/H  
   } -!q^/ux  
  } - ({h @  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 {.eo?dQ  
   for(int index=0;index<MAX_KEY;index++){ *O_>3Hgl  
    if(hCallWnd[index]==NULL) w{mw?0  
     continue; xu\s2x$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 6 dgwsl~  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ~[<C6{  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 KrdEB0qh  
   } 5\V""fH  
  } [4w*<({*  
 } agt/;>q\~  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Hsn'"  
} z^vfha  
qA0PGo  
  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: iYD5~pK8  
sKCYGt$  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); hi`[  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 0 30LT$&!  
t'1g+g  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: bFjH* ~ P  
,BUrZA2\U$  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 1oe,>\\  
{ >dx/k)~~-L  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) X!_&%^L'  
 { e>6|# d  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 DL`8qJ'mJs  
  SaveBmp(); {7jl) x3l  
  return FALSE; X$e*s\4  
 } ":0u%E?s  
 …… //其它处理及默认处理 3^[P  
} %_."JT$v{  
k3K*{"z  
q #mBNe62p  
  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。 eAmI~oku  
Om^(CAp  
  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。 &(oA/jFQ  
aq)g&.dw?  
  二、编程步骤 DkX^b:D*f  
s_  t/  
  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"; C~egF=w  
tn#cVB3  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; fLnwA|n=  
O}>@G  
  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; /poGhB 1k  
|.VSw  
  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; 4GbfA .u  
Y?TS,   
  5、 添加代码,编译运行程序。 @Ddz|4vEi  
(<YBvpt4>  
三、程序代码 EsGf+-}|!0  
9}%$j  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Q,:{(R  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ! ui   
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ^3[_4av  
#if _MSC_VER > 1000 v^ "qr?3V  
#pragma once BBM[Fy37!}  
#endif // _MSC_VER > 1000 ").gPmC  
#ifndef __AFXWIN_H__ $33E-^  
#error include 'stdafx.h' before including this file for PCH WG A1XQ{  
#endif Da615d  
#include "resource.h" // main symbols &#L C'  
class CHookApp : public CWinApp h;,1BpbM  
{ f-3CDUQ`  
 public: =* G3Khz!  
  CHookApp(); udu<Nis4  
  // Overrides {.542}A  
  // ClassWizard generated virtual function overrides m^!:n$  
  //{{AFX_VIRTUAL(CHookApp) 4j~q,# $LW  
 public: =WjHf8v;  
  virtual BOOL InitInstance(); LD ]-IX&L  
  virtual int ExitInstance(); N"}>);r  
  //}}AFX_VIRTUAL 5mQ@&E~#W  
  //{{AFX_MSG(CHookApp) mFg$;F  
  // NOTE - the ClassWizard will add and remove member functions here. @4hzNi+  
  // DO NOT EDIT what you see in these blocks of generated code ! g'KxjjYT,  
  //}}AFX_MSG ffG<hclk  
  DECLARE_MESSAGE_MAP() hH 5}%/vF  
}; TKM^  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); %ggf|\ -e  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); P&sWn?q Ol  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); XHekz6_  
BOOL InitHotkey(); s EFQ8S  
BOOL UnInit(); @QV0l]H0+  
#endif OL>)SJj5  
H.\`(`6  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. '{cSWa| #  
#include "stdafx.h" Rjq Xz6  
#include "hook.h" ._^}M<o L  
#include <windowsx.h> 0W(mx-[H/  
#ifdef _DEBUG  ][wb4$2  
#define new DEBUG_NEW o>_})WM1[  
#undef THIS_FILE rw,Ylr :3  
static char THIS_FILE[] = __FILE__; uG^CyM>R`  
#endif ^#d\HI  
#define MAX_KEY 100 (B>/LsTu  
#define CTRLBIT 0x04 'g!T${  
#define ALTBIT 0x02 r5DR F4,7  
#define SHIFTBIT 0x01 V_:`K$  
#pragma data_seg("shareddata") |]4!WBK  
HHOOK hHook =NULL; qS#G7~ur>y  
UINT nHookCount =0; Hl,{4%]  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey >=[uLY[aK  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT eJ99W=  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey hE|P|0U,n  
static int KeyCount =0; .Q%Hi7JMi  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ,c4HicRJ#  
#pragma data_seg() X>8,C^~$1  
HINSTANCE hins; g3z/yj  
void VerifyWindow(); F%h3?"s  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 8@;]@c)m  
//{{AFX_MSG_MAP(CHookApp) zMR)w77  
// NOTE - the ClassWizard will add and remove mapping macros here. Ea&|kO|  
// DO NOT EDIT what you see in these blocks of generated code! A#. %7S  
//}}AFX_MSG_MAP xIGq+yd(  
END_MESSAGE_MAP() >G:Q/3jh  
~ubvdQEW  
CHookApp::CHookApp() hI'WfF!X  
{ rW)h ? , b  
 // TODO: add construction code here, !l9{R8m>eJ  
 // Place all significant initialization in InitInstance pcy;]U ?  
} <{isWEW9]3  
WeM38&dWY  
CHookApp theApp; kJJT`Ba&/  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) au{) 5W4~  
{ $Z:O&sD{  
 BOOL bProcessed=FALSE; 2)n`Bd  
 if(HC_ACTION==nCode) $D1ha CL  
 { UJL2IF-x  
  if((lParam&0xc0000000)==0xc0000000){// Key up ~Q&J\'GQH  
   switch(wParam) HU'Mi8xxy  
   { M76p=*  
    case VK_MENU: 5EFt0?G   
     MaskBits&=~ALTBIT; inWLIXC,  
     break; ,X.[37  
    case VK_CONTROL: /K#k_k  
     MaskBits&=~CTRLBIT; I8Aq8XBw  
     break; m\56BP-AM  
    case VK_SHIFT: 5dePpFD5  
     MaskBits&=~SHIFTBIT; xU.1GI%UPu  
     break; fzIs^(:fl  
    default: //judge the key and send message ; ~pgF_  
     break; |-Uh3WUE6  
   } J#I RbO)  
   for(int index=0;index<MAX_KEY;index++){ B&]`OO>O  
    if(hCallWnd[index]==NULL) M7TLQqaF  
     continue; `,qft[1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (QDKw}O2b  
    { !;eE7xn&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ZwkUd-=0i  
     bProcessed=TRUE; Cz0FA]-g  
    } =rA?,74  
   } 4!IuTPmr  
  } ./#YUIC  
  else if((lParam&0xc000ffff)==1){ //Key down h[W`P%xZ  
   switch(wParam) AELj"=RA  
   { %L=e%E=m  
    case VK_MENU: *'>_XX  
     MaskBits|=ALTBIT; Az&>.*  
     break; \N9=13W<lK  
    case VK_CONTROL: { ADd[V  
     MaskBits|=CTRLBIT; 'z$$ZEz!C  
     break; F\m^slsu7=  
    case VK_SHIFT: {7o3wxsS  
     MaskBits|=SHIFTBIT; 6KMO*v  
     break; -G(me"Cu  
    default: //judge the key and send message .nPOjwEx&Y  
     break;  [E1qv;   
   } #L*\^ c  
   for(int index=0;index<MAX_KEY;index++) Lc{AB!Br  
   { w:5?ofC  
    if(hCallWnd[index]==NULL) aJ'Fn  
     continue; !*-|!Vz  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) S(gr>eC5  
    { cnu&!>8V  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); -c_l nK  
     bProcessed=TRUE; x3q^}sj%  
    } .KrLvic  
   } ?2]fE[SqY  
  } rtj/&>  
  if(!bProcessed){ 39v Bsc  
   for(int index=0;index<MAX_KEY;index++){ t7f(%/] H0  
    if(hCallWnd[index]==NULL) > Vm}u`x  
     continue; S%iK);  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) `?z('FV  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); N3%#JdzZ$  
   } B!wN%> U  
  } 8,U~ p<Gz  
 } =A'>1N  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); P T;{U<5  
} 0t7N yKU  
c,a8#Og  
BOOL InitHotkey() y!b2;- Dp  
{ JP>EW&M  
 if(hHook!=NULL){ GHsDZ(d3.  
  nHookCount++; s<!A< +Sh  
  return TRUE; Nf| 0O\+%y  
 } 9^a|yyzL  
 else Jh-yIk  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ~su>RolaX  
  if(hHook!=NULL) }>{R<[I!G  
   nHookCount++; w){B$X  
  return (hHook!=NULL); hIV9.{J  
} LeCc`x,5  
BOOL UnInit() 3~`P8 9  
{ Y/sav;  
 if(nHookCount>1){ 7h\is  
  nHookCount--; "Hw%@]#  
  return TRUE; Y2L{oQ.C2  
 } NfoHQU <n  
 BOOL unhooked = UnhookWindowsHookEx(hHook); MSCH6R"5  
 if(unhooked==TRUE){ Va?]:Q  
  nHookCount=0; jwI2T$  
  hHook=NULL; BZ?w}%-MO  
 } JN8Rh  
 return unhooked; tj;47UtH  
} & DP"RWT/  
Oe Q[-e  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) =F \Xt "  
{ TzKM~a#  
 BOOL bAdded=FALSE; && ]ix3  
 for(int index=0;index<MAX_KEY;index++){ WSozDNF!'f  
  if(hCallWnd[index]==0){ U^_\V BAk  
   hCallWnd[index]=hWnd; bc(MN8b]j  
   HotKey[index]=cKey; -C2!`/U  
   HotKeyMask[index]=cMask; #w;"s*  
   bAdded=TRUE; n*[ZS[I  
   KeyCount++; 3eUi9_s+  
   break; 02,t  
  } >#h,q|B  
 } Yi9Y`~J  
 return bAdded; fM.#FT??  
} [[[C`H@  
2bCfY\k  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) hJSvx  
{ .i;.5)shsu  
 BOOL bRemoved=FALSE; LH54J;7 Y  
 for(int index=0;index<MAX_KEY;index++){ 3HyOQD"{  
  if(hCallWnd[index]==hWnd){ QvbH " 7  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ "}X+vd``  
    hCallWnd[index]=NULL; vd%AV(]<LJ  
    HotKey[index]=0; "nz\YQdg  
    HotKeyMask[index]=0; r5gqRh}+  
    bRemoved=TRUE; '-"[>`[q  
    KeyCount--; Z` kVyuQ  
    break; 2sGKn a  
   } : ;8L1'  
  } E:qh}wY  
 } kI"9T`owR  
 return bRemoved; ! >F70  
} GbLHzw  
! VT$U6  
void VerifyWindow() E]Mx<7;\.  
{ ICz:>4M-dn  
 for(int i=0;i<MAX_KEY;i++){ `%\CO `  
  if(hCallWnd!=NULL){ #j Tkz  
   if(!IsWindow(hCallWnd)){ ]\rQ{No  
    hCallWnd=NULL; ]EK(k7nH  
    HotKey=0; .c>6}:ye  
    HotKeyMask=0; 9 m8KDB[N  
    KeyCount--; %oqKpD+  
   } Ko&4{}/  
  } 1 V]ws}XW  
 } /[?} LrDO  
} P<>NV4  
&j~9{ C  
BOOL CHookApp::InitInstance() f@`|2wG  
{ /S J><  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); N4 x5!00  
 hins=AfxGetInstanceHandle(); .$s']' =  
 InitHotkey(); A,&711Y  
 return CWinApp::InitInstance(); [.&JQ  
} r], %:imGr  
COsy.$|4  
int CHookApp::ExitInstance() yf*'=q  
{ ^W sgAyCB  
 VerifyWindow(); </'n={+q  
 UnInit(); 0xZ^ f}@L  
 return CWinApp::ExitInstance(); V]Te_ >E;w  
} E-1u_7  
ktPM66`b  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file z4 =OR@ h  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Y;R,ph.a  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ g}R#0gkdk}  
#if _MSC_VER > 1000 E-^(VZ_Xj  
#pragma once rV\G/)xL  
#endif // _MSC_VER > 1000 UB+~K/  
/*;a6S8q  
class CCaptureDlg : public CDialog '__>M>[  
{ 4IW fp&Q!  
 // Construction --diG$x.  
 public: >!qtue7B  
  BOOL bTray; k>i`G5Dh  
  BOOL bRegistered; CF3x\6.q}  
  BOOL RegisterHotkey(); R<f F ^^  
  UCHAR cKey; p8XvfM  
  UCHAR cMask; 4RctYMz  
  void DeleteIcon(); -uN{28;@  
  void AddIcon(); '+Jy//5?  
  UINT nCount; v5@4 |u3ds  
  void SaveBmp(); 0Sk~m4fj(  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor w;Azxcw  
  // Dialog Data @-K[@e/uwy  
  //{{AFX_DATA(CCaptureDlg) ;07$G+['  
  enum { IDD = IDD_CAPTURE_DIALOG }; Xl1%c7r.1  
  CComboBox m_Key; kI a16m  
  BOOL m_bControl; 9:g A0Z  
  BOOL m_bAlt; xtCMK1# x  
  BOOL m_bShift; J;<dO7j5  
  CString m_Path; fn/?I \  
  CString m_Number; s#<fj#S  
  //}}AFX_DATA t{B@k[|  
  // ClassWizard generated virtual function overrides dSKvs"  
  //{{AFX_VIRTUAL(CCaptureDlg) 5s\;7>  
 public: |X*y-d77W  
  virtual BOOL PreTranslateMessage(MSG* pMsg); VMF?qT3Nd  
 protected: v .*fJ   
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support $@kOMT  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Vo^J2[U  
  //}}AFX_VIRTUAL #|8%h  
  // Implementation R`$Y]@i&B  
 protected: CAx$A[f<  
  HICON m_hIcon; W%5))R$  
  // Generated message map functions s)E8}-v  
  //{{AFX_MSG(CCaptureDlg) tq,^!RSbZ  
  virtual BOOL OnInitDialog(); #/Ob_~-?j  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); =\u,4  
  afx_msg void OnPaint(); |Isn<|_  
  afx_msg HCURSOR OnQueryDragIcon(); SFh<>J^ 0a  
  virtual void OnCancel(); !YpH\wUyvP  
  afx_msg void OnAbout(); 8&HBR #  
  afx_msg void OnBrowse(); ;F- mt(Y  
  afx_msg void OnChange(); IR]5,K^l  
 //}}AFX_MSG dh%O {t  
 DECLARE_MESSAGE_MAP() <V}q8k  
}; Lj|wFV  
#endif b&@]f2 /  
U/PNEGuQ  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file }|/A &c  
#include "stdafx.h" Z  #  
#include "Capture.h" 6:S, {@G  
#include "CaptureDlg.h" MCTJ^g"D  
#include <windowsx.h> D^>d<LX  
#pragma comment(lib,"hook.lib") zqrqbqK5R  
#ifdef _DEBUG 8ZbXGQ  
#define new DEBUG_NEW 1!V[fPJ  
#undef THIS_FILE \15'~ ]d  
static char THIS_FILE[] = __FILE__; g]JJ!$*1  
#endif 4".I*ij  
#define IDM_SHELL WM_USER+1 r [^.\&-  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ._>03,"  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); \VEnP=*:W  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; |AE{rvP{@  
class CAboutDlg : public CDialog @D*PO-s9  
{ ud(0}[  
 public: w%TrL+v  
  CAboutDlg(); sZ&6g<8#y  
  // Dialog Data iku*\,6W  
  //{{AFX_DATA(CAboutDlg) Gjq7@F'  
  enum { IDD = IDD_ABOUTBOX }; LCS.C(n,  
  //}}AFX_DATA '_7rooU9  
  // ClassWizard generated virtual function overrides `-CN\  
  //{{AFX_VIRTUAL(CAboutDlg) {HM[ )t0  
 protected: Jlb{1B$7  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support K"t?  
  //}}AFX_VIRTUAL lb9?Uc@  
  // Implementation #J3}H   
 protected: irm4lb5  
  //{{AFX_MSG(CAboutDlg) r?Mf3U^G  
  //}}AFX_MSG PfU\.[l$  
  DECLARE_MESSAGE_MAP() #>KiX84  
}; Z~h6^h   
y@$E5sz  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ]=ApYg7!  
{ P5B,= K>r  
 //{{AFX_DATA_INIT(CAboutDlg) YCStX)r  
 //}}AFX_DATA_INIT GPGP teC  
} H-&27?s^  
^Os }sJ*5S  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Qp[ Jw?a  
{ p),* 4@2<  
 CDialog::DoDataExchange(pDX); E0VAhN3G\  
 //{{AFX_DATA_MAP(CAboutDlg) u59l)8=  
 //}}AFX_DATA_MAP FXY>o>K%h  
} 8<0P Ssx  
P 0+@,kM  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) <]%6x[  
 //{{AFX_MSG_MAP(CAboutDlg) %U}6(~  
 // No message handlers jK/F zD0-  
 //}}AFX_MSG_MAP "|J6*s   
END_MESSAGE_MAP() />8A?+g9u  
"3]}V=L<5  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) \ ;]{`  
: CDialog(CCaptureDlg::IDD, pParent) t oDi70o  
{ ( sl{Rgxe*  
 //{{AFX_DATA_INIT(CCaptureDlg) zOMxg00  
  m_bControl = FALSE; b'SP,}s5"  
  m_bAlt = FALSE; Kv1~,j6  
  m_bShift = FALSE; zRLJ|ejMP  
  m_Path = _T("c:\\"); uUx7>algF  
  m_Number = _T("0 picture captured."); QGOkB  
  nCount=0; EpRn,[  
  bRegistered=FALSE; QPLWRZu@  
  bTray=FALSE; hR0a5   
 //}}AFX_DATA_INIT aqqo>O3 s  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 %X\A|V&  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); R0#scr   
} @$5~`?  
W{q P/R  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) R#ZJLT  
{ Sn'!Nq>  
 CDialog::DoDataExchange(pDX); 6y Muj<L  
 //{{AFX_DATA_MAP(CCaptureDlg) '3^qW  
  DDX_Control(pDX, IDC_KEY, m_Key); RAhDSDf  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); WzR)R9x]  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 4?@#w>(  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); |[5;dt_U/  
  DDX_Text(pDX, IDC_PATH, m_Path); 2 KHT!ik  
  DDX_Text(pDX, IDC_NUMBER, m_Number); oI`Mn3N  
 //}}AFX_DATA_MAP ami>Pp  
} OW=3t#"7Kp  
g8'8"9:xC  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) "]p&7  
//{{AFX_MSG_MAP(CCaptureDlg) DFZ@q=ZT  
 ON_WM_SYSCOMMAND() b@4UR<  
 ON_WM_PAINT() !D{z. KO  
 ON_WM_QUERYDRAGICON() }m?Ut|  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) =ZU!i0 K  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) W\Scak>  
 ON_BN_CLICKED(ID_CHANGE, OnChange) a]P%Y.? r  
//}}AFX_MSG_MAP <4;, y*"n  
END_MESSAGE_MAP() b p?TO]LH  
KK >j V  
BOOL CCaptureDlg::OnInitDialog() W!.FnM5x  
{ }oG6XI9  
 CDialog::OnInitDialog(); JBw2#ry  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); uA =%EEZ  
 ASSERT(IDM_ABOUTBOX < 0xF000); Bx}"X?%S  
 CMenu* pSysMenu = GetSystemMenu(FALSE); _nzq(m1@  
 if (pSysMenu != NULL) IMdp"  
 { _(gkYJ+MK  
  CString strAboutMenu; K\B!tk  
  strAboutMenu.LoadString(IDS_ABOUTBOX); %YF /=l  
  if (!strAboutMenu.IsEmpty()) {_.(,Z{  
  { mMZrBz7r  
   pSysMenu->AppendMenu(MF_SEPARATOR); X#0yOSR  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 5M'cOJ  
  } 9cN@y<_I  
 } $4ZV(j]  
 SetIcon(m_hIcon, TRUE); // Set big icon By!u*vSev  
 SetIcon(m_hIcon, FALSE); // Set small icon FVP,$  
 m_Key.SetCurSel(0); +&f_k@+  
 RegisterHotkey(); O,^s)>c  
 CMenu* pMenu=GetSystemMenu(FALSE); Yyd}>+|<,  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); !~F oy F  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); S{2;PaK  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); +ru`Zw5,  
 return TRUE; // return TRUE unless you set the focus to a control =z9,=rR4  
} @##}zku  
k 75 p  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) zCA8}](C^  
{ t xnH~;(  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) t'W6Fmwkx  
 { B[8 RBTsA  
  CAboutDlg dlgAbout; 8R\6hYJ%F  
  dlgAbout.DoModal(); [D+PDR  
 } GFbn>dY  
 else V#b*:E.cA  
 { <x;g9Z>(  
  CDialog::OnSysCommand(nID, lParam); jM6$R1HX  
 } F+R1}5-3cl  
} ZT/f  
Z \ @9*  
void CCaptureDlg::OnPaint() zSsBbu:  
{ LR#.xFQ+  
 if (IsIconic()) =M@)q y  
 { \J?&XaO=  
  CPaintDC dc(this); // device context for painting ^hEN  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); m^ar:mK@  
  // Center icon in client rectangle Xu_1r8-|=b  
  int cxIcon = GetSystemMetrics(SM_CXICON); r:0RvWif  
  int cyIcon = GetSystemMetrics(SM_CYICON); Dvz 6 E  
  CRect rect; hTby:$aCg  
  GetClientRect(&rect); J'=s25OWU  
  int x = (rect.Width() - cxIcon + 1) / 2; c; .y  
  int y = (rect.Height() - cyIcon + 1) / 2; ]moBVRd  
  // Draw the icon 3bC-B!{;g  
  dc.DrawIcon(x, y, m_hIcon); d@JavcR  
 } gV':Xe  
 else fWfhs}_  
 { k8}'@w  
  CDialog::OnPaint(); $`0^E#Nl  
 } K]>4*)A:  
} u\xrC\Ka  
G5 )"%G.  
HCURSOR CCaptureDlg::OnQueryDragIcon() c??m9=OX1  
{ Wx;%W"a  
 return (HCURSOR) m_hIcon; fIx|0,D&7L  
} h;} fdk  
S$wC{7?f  
void CCaptureDlg::OnCancel() 'i3-mZ/|8  
{ O@H D'  
 if(bTray) KU+u.J  
  DeleteIcon(); l&] %APL  
  CDialog::OnCancel(); MB>4Y]rtU  
} +ZE"pA^C  
y\iECdPU  
void CCaptureDlg::OnAbout() u5U^}<}y}  
{ d@Bd*iI<  
 CAboutDlg dlg; ~k 6V?z}  
 dlg.DoModal(); Ug gg!zA  
} V~o'L#a  
#gf0*:p  
void CCaptureDlg::OnBrowse() oM#+Z qP  
{ u,YmCEd_V  
 CString str; 8h}1t4k  
 BROWSEINFO bi; #>5T,[{?j  
 char name[MAX_PATH]; 4_CXs.v1  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); UY.o,I> s  
 bi.hwndOwner=GetSafeHwnd(); |P9)*~\5  
 bi.pszDisplayName=name; @frV:%  
 bi.lpszTitle="Select folder"; Opy{i#>  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 5PpS/I:on  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 3v#F0s|  
 if(idl==NULL) jM{5nRQ  
  return; 4|eI_u{_  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); @Y9tkJIt  
 str.ReleaseBuffer(); -=1>t3~\  
 m_Path=str; cUi6 On1C  
 if(str.GetAt(str.GetLength()-1)!='\\') hG9Mp!d91  
  m_Path+="\\"; vHPsHy7y  
 UpdateData(FALSE); KUq(&H7  
} ^\VVx:]  
]nxSVKE4p  
void CCaptureDlg::SaveBmp() '2<N_)43$  
{ }b<w\9AF  
 CDC dc; TPN1Rnt0`  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); PP_ar{|7  
 CBitmap bm; ~me/ve  
 int Width=GetSystemMetrics(SM_CXSCREEN); r0'a-Mk;  
 int Height=GetSystemMetrics(SM_CYSCREEN); 90<a'<\|  
 bm.CreateCompatibleBitmap(&dc,Width,Height); mG *Yv  
 CDC tdc; !*"#*)S.  
 tdc.CreateCompatibleDC(&dc); O+Db#FW  
 CBitmap*pOld=tdc.SelectObject(&bm); f.vJJa  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); <\ ".6=E#W  
 tdc.SelectObject(pOld); ^v3J ld  
 BITMAP btm; !.|A}8nK  
 bm.GetBitmap(&btm); ="g9>  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; KC<K*UHPAH  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 2XjH1  
 BITMAPINFOHEADER bih; 8)f/H&)>8  
 bih.biBitCount=btm.bmBitsPixel; R&/"?&pfa  
 bih.biClrImportant=0; sk t9mU  
 bih.biClrUsed=0; e&<=+\ul  
 bih.biCompression=0; v+d`J55  
 bih.biHeight=btm.bmHeight; 1:I _ ;O_  
 bih.biPlanes=1; b^P\Kky  
 bih.biSize=sizeof(BITMAPINFOHEADER); | gGD3H  
 bih.biSizeImage=size; Q'^$;X~-<  
 bih.biWidth=btm.bmWidth; $D*Yhv!/  
 bih.biXPelsPerMeter=0; fzjtaH?  
 bih.biYPelsPerMeter=0; 7zNfq.Ni~  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); r8_MIGM'  
 static int filecount=0; l>7?B2^<E  
 CString name; P$/Y9o  
 name.Format("pict%04d.bmp",filecount++); \&v)#w  
 name=m_Path+name; f_.0 uM  
 BITMAPFILEHEADER bfh; #Y'ub 5s  
 bfh.bfReserved1=bfh.bfReserved2=0; d&DQ8Gm ^  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Hv =7+O$  
 bfh.bfSize=54+size; #J$z0%P  
 bfh.bfOffBits=54; |A)a ='Ap  
 CFile bf; ~\O,#j`_  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ HNX/#?3  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); $|19]3T@Z  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); > mP([]  
  bf.WriteHuge(lpData,size);  zK:2.4  
  bf.Close(); 6ZC~q=my  
  nCount++; \%#luk@:  
 } Gkdxw uRw  
 GlobalFreePtr(lpData); :-+j,G9 t  
 if(nCount==1) .7Itbp6=R  
  m_Number.Format("%d picture captured.",nCount); qi1#s,  
 else 6s:  
  m_Number.Format("%d pictures captured.",nCount); q:,ck@-4  
  UpdateData(FALSE); P`n"E8"ab<  
} Y^5)u/Y=U  
TI^X gl~  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 3pkx3tp{  
{ C^ ~[b o  
 if(pMsg -> message == WM_KEYDOWN) `6*1mE1K&  
 {  1W>0  
  if(pMsg -> wParam == VK_ESCAPE) R+=Xr<`%U|  
   return TRUE; l27J  
  if(pMsg -> wParam == VK_RETURN) %/K;!'7  
   return TRUE; Mbxrj~ue  
 } }pT>dbZ  
 return CDialog::PreTranslateMessage(pMsg); iB{l:  
} Q2t>E(S  
s#(<zBZ9p#  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 69``j{Z+  
{ JZ"XrS0?  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 4m_CPe  
  SaveBmp(); DV~g  
  return FALSE; K=J">^uW  
} 3TT?GgQ  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ fj y2\J!  
 CMenu pop; \'P79=AU  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); hh^_Z| 5  
 CMenu*pMenu=pop.GetSubMenu(0); l`EKL2n  
 pMenu->SetDefaultItem(ID_EXITICON); n!?u/[@  
 CPoint pt; cq 1)b\|  
 GetCursorPos(&pt); xcXnd"YYE  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 9P-I)ZqL  
 if(id==ID_EXITICON) kO8oH8Vt  
  DeleteIcon(); %uy?@e  
 else if(id==ID_EXIT) fSm|anuKZe  
  OnCancel(); X0]5I0YP  
 return FALSE; '# J/e0o@  
} yxy~N\ 0  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); .$r7q[  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) {&)E$ M  
 AddIcon(); {9h`h08?z  
 return res; RV6|sN[x>  
} @?[}\9dW  
(!diPwcv  
void CCaptureDlg::AddIcon() D~f[Rg  
{ -Rr Qv(  
 NOTIFYICONDATA data; h_xzqElZu  
 data.cbSize=sizeof(NOTIFYICONDATA); FmtV[C #  
 CString tip; 5[rA>g~  
 tip.LoadString(IDS_ICONTIP); qa/VSk!{  
 data.hIcon=GetIcon(0); S>EO6z#   
 data.hWnd=GetSafeHwnd(); sKL"JA T  
 strcpy(data.szTip,tip); @D=i|f  
 data.uCallbackMessage=IDM_SHELL; 0/b3]{skK  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; qf B!)Y  
 data.uID=98; Vg1MA  
 Shell_NotifyIcon(NIM_ADD,&data); K]Z];C#)  
 ShowWindow(SW_HIDE); MVe4[<  
 bTray=TRUE; \yA*)X+  
} SQI =D8  
{'q(a4  
void CCaptureDlg::DeleteIcon() oJor ]QYK  
{ JA6#qlylL  
 NOTIFYICONDATA data; t;)`+K#1:  
 data.cbSize=sizeof(NOTIFYICONDATA); )ZDqj  
 data.hWnd=GetSafeHwnd(); 1H7 bPl|  
 data.uID=98; 690;\O '  
 Shell_NotifyIcon(NIM_DELETE,&data); :3By7BZgj  
 ShowWindow(SW_SHOW); 'FmnlC1  
 SetForegroundWindow(); 6kHb*L Je  
 ShowWindow(SW_SHOWNORMAL); #s|/5[i  
 bTray=FALSE; >I *uo.OF  
} 4[f>kY%[  
0D^c4[Y'l  
void CCaptureDlg::OnChange() 2g_2$)2  
{ `EzC'e  
 RegisterHotkey(); C4t@;U=x  
} oa8xuFu(n  
`:;fc  
BOOL CCaptureDlg::RegisterHotkey() P#ot$@1v  
{ sn:wLc/GAd  
 UpdateData(); 4lF?s\W:  
 UCHAR mask=0; 2vX!j!_  
 UCHAR key=0; &s_)|K  
 if(m_bControl) eR:!1z_h  
  mask|=4; "|K D$CY  
 if(m_bAlt) OmC F8:\/  
  mask|=2; +p_>fO  
 if(m_bShift) mpDQhD[n  
  mask|=1; {t QZqqdn@  
  key=Key_Table[m_Key.GetCurSel()]; 5jK9cF$>  
 if(bRegistered){ g ,""j`  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); =&v&qn e9  
  bRegistered=FALSE; ]sV) '-  
 } CC{{@  
 cMask=mask; [[VB'Rs  
 cKey=key; 8/+x1,S%  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); aj@<4A=;  
 return bRegistered; K6@9=_A  
} P)&qy .+E0  
,L9ioYbp  
  四、小结 C: <TJ  
}|(v0]  
  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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