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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: .t&G^i'n  
  ^oW{N  
  一、实现方法 4_$.gO  
8 tIy"5  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: K(WKx7Kky^  
dB:c2  
#pragma data_seg("shareddata") y3PrLBTz  
HHOOK hHook =NULL; //钩子句柄 i1bmUKZ8'L  
UINT nHookCount =0; //挂接的程序数目 1i)3!fH0:  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 =4V SbOlZ  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 9^nRwo  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey +!$`0v   
static int KeyCount =0; i` ay9J8N  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1  Wu8^Z Z{  
#pragma data_seg() sNP ;  
QBN\wL8g  
  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。 8Kk41=  
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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: Z/|=@gpw  
es=OWJt^  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR <td]k%*+  
cKey,UCHAR cMask) 9QL%q; #  
{ 25@@-2h @  
 BOOL bAdded=FALSE; }Gy M<!:  
 for(int index=0;index<MAX_KEY;index++){ ,xAF=t  
  if(hCallWnd[index]==0){ & d$X:  
   hCallWnd[index]=hWnd; PrA(==FX/  
   HotKey[index]=cKey; mm.%Dcn  
   HotKeyMask[index]=cMask; ;Zr7NKs  
   bAdded=TRUE; mZjpPlJ  
   KeyCount++;  X>P|-n#  
   break; ,LxkdV  
  } BBv+*jj  
 } =)gdxywoC  
 return bAdded; z0#2?o  
} 6<R[hIWpZ}  
//删除热键 %O<8H7e)V  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) l=(( >^i  
{ M]/DKo  
 BOOL bRemoved=FALSE; %H2ios[UO  
 for(int index=0;index<MAX_KEY;index++){ ?(z"U b]  
  if(hCallWnd[index]==hWnd){ &g1\0t  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ a60rJ#GD  
    hCallWnd[index]=NULL; F[`dX  
    HotKey[index]=0; #.$y   
    HotKeyMask[index]=0; R^ P>yk8  
    bRemoved=TRUE; "Aw)0a[j1  
    KeyCount--; 4RYH^9;>K  
    break; @qj]`}Gx'  
   } |r36iUHZS  
  } CyW|k Dz  
 } >xq. bG  
 return bRemoved; m8e()8lZ3  
} Kfr1k  
kxJ[Bi#  
4v3gpLH  
  DLL中的钩子函数如下: ;ko6igx)+  
F"O\uo:3  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) eF9GhwE=  
{ VuH ->  
 BOOL bProcessed=FALSE; <JU3sXl  
 if(HC_ACTION==nCode) 2lOUNxQ$  
 { =WBfaxL}  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 TsGx2[  
   switch(wParam) Q~VM.G  
   {  /kg#i&bP~  
    case VK_MENU: Gn_DIFa  
     MaskBits&=~ALTBIT;  0yq  
     break; j%^4 1y  
    case VK_CONTROL: _vDmiIn6K  
     MaskBits&=~CTRLBIT; 1EEcNtpub]  
     break; NRx I?v  
    case VK_SHIFT: -)VjjKz]8  
     MaskBits&=~SHIFTBIT; Lhe&  
     break; {uoF5|O6K  
    default: //judge the key and send message s.Ai _D  
     break; 6$'*MpYF4  
   } Q}KOb4D  
   for(int index=0;index<MAX_KEY;index++){ J ou*e%  
    if(hCallWnd[index]==NULL) L \E>5G;  
     continue; &tvp)B?cWk  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) l &'q+F  
    { EwA*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 4gsQ:3  
     bProcessed=TRUE; *4}NLUVX  
    } VJ&<6  
   } ,m5i(WL  
  } p\lR1  
  else if((lParam&0xc000ffff)==1){ //有键按下 }$'_%,  
   switch(wParam) E5M/XW\E6  
   { /UK]lP^w]!  
    case VK_MENU: C&MqH.K  
     MaskBits|=ALTBIT; dS4zOz"  
     break; ipbhjK$  
    case VK_CONTROL: z[v4(pO 6  
     MaskBits|=CTRLBIT; /bB4ec8!  
     break; KvPCb%!ZP  
    case VK_SHIFT: orH6R8P]  
     MaskBits|=SHIFTBIT; zIjfx K  
     break; tm^joK[{|J  
    default: //judge the key and send message ZL\^J8PRK  
     break; o,dp{+({  
   } 9&AO  
   for(int index=0;index<MAX_KEY;index++){ ,)#rD9ZnC  
    if(hCallWnd[index]==NULL) M K)}zjw  
     continue; 1BU97!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >19s:+  
    { \\#D!q*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); UGy3 B)  
     bProcessed=TRUE; to</  
    } ,.>9$(s  
   } h%ys::\zF  
  } WcNQF!f  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 A#T"4'#?<  
   for(int index=0;index<MAX_KEY;index++){ PENB5+1OK  
    if(hCallWnd[index]==NULL) !V3+(o 1  
     continue; :VZS7$5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) d$3md<lIB  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); >{tn2Fkg>  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 6{=U= *  
   } Af]zv~uM  
  } w|s2f`!  
 } n-cI~Ax+4  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); `hkvxt  
} O& Sk}^  
$jE<n/8  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: d 4;$=P  
QhJN/v  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); vxEi C:&]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Mh-"B([Z  
Sl, DZ!  
  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: ocZ}RI#Q  
o?>0WSLlm  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ]$r]GVeN}H  
{ #xGP|:m  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) j;]I -M[  
 { vHcl7=)Q  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 6dr 'nP  
  SaveBmp(); l_Lz9k  
  return FALSE; Y $v#>w_M  
 } G&{yM2:E  
 …… //其它处理及默认处理 p7;K] AW  
} {\`tt c>  
D!,5j_,j%  
>jhcSvM6  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 mnK<5KLg1  
JR.)CzC  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 -(:T&rfTp  
v.Bwg 7R3  
  二、编程步骤 A&t8C8,  
`+n#CWZ"Y  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; 8$ _{R!x  
<1*.:CL"s  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; DPxx9lN_rx  
;7:} iKU  
  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; ~ O#\$u  
KJec/qca  
  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; cLf90|YFp  
=|1_6.tz  
  5、 添加代码,编译运行程序。 E b[;nk?  
-^m?%_<50l  
三、程序代码 xn2nh@;  
vkTu:3Qe  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 4uOR=+/l  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 2 {b/*w  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ D r(0w{5  
#if _MSC_VER > 1000 u'l4=e  
#pragma once SqPqL<,e  
#endif // _MSC_VER > 1000 ?g+3 URpK  
#ifndef __AFXWIN_H__ lz#.f,h  
#error include 'stdafx.h' before including this file for PCH 7gf(5p5ZV  
#endif q=88*Y  
#include "resource.h" // main symbols p-.kBF  
class CHookApp : public CWinApp O^8ZnN_+  
{ ;O`f+rG~  
 public: Gkuqe3  
  CHookApp(); e7;7TrB.  
  // Overrides :KO&j"[  
  // ClassWizard generated virtual function overrides I#(lxlp"Ho  
  //{{AFX_VIRTUAL(CHookApp) Hvk~BP' m  
 public: /ZV2f3;t  
  virtual BOOL InitInstance(); yHw @Z  
  virtual int ExitInstance(); m)p|NdTZc8  
  //}}AFX_VIRTUAL D}y W:Pi'  
  //{{AFX_MSG(CHookApp) ZDmL?mC  
  // NOTE - the ClassWizard will add and remove member functions here. y7F |v8bq  
  // DO NOT EDIT what you see in these blocks of generated code ! MQwxQ{  
  //}}AFX_MSG (2H GV+Dg  
  DECLARE_MESSAGE_MAP() S2'ai  
}; zBy} >Jx  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); vlkw Wm  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $8eiifj  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ,@f"WrQ  
BOOL InitHotkey(); &wK:R,~x6  
BOOL UnInit(); {UP[iw$~  
#endif gW~T{+f  
cgrSd99.  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. hE(R[hc  
#include "stdafx.h" A|f6H6UUx  
#include "hook.h" i0{\c}r:4b  
#include <windowsx.h> b&[".ibN1  
#ifdef _DEBUG &!/>B .  
#define new DEBUG_NEW )^o.H~Pv  
#undef THIS_FILE .|[{$&B  
static char THIS_FILE[] = __FILE__; YgcW1}  
#endif )v;O2z  
#define MAX_KEY 100 B=d< L^  
#define CTRLBIT 0x04 `YqtI/-w  
#define ALTBIT 0x02 6o#/[Tz  
#define SHIFTBIT 0x01 c46-8z$  
#pragma data_seg("shareddata") Qa=Y?=Za  
HHOOK hHook =NULL; PSq?8.  
UINT nHookCount =0; /";tkad^  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey p}!i_P  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ASbI c"S6  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ]`$yY5&W0  
static int KeyCount =0; h s',f  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift vz4( k/  
#pragma data_seg() B.G6vx4yp  
HINSTANCE hins; L&kCI`Tb  
void VerifyWindow(); HN5661;8  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ;"Gy5  
//{{AFX_MSG_MAP(CHookApp) pCIS8 2L  
// NOTE - the ClassWizard will add and remove mapping macros here. 0R)x"4Ww  
// DO NOT EDIT what you see in these blocks of generated code! p($vM^_<"  
//}}AFX_MSG_MAP HZ'rM5Kq  
END_MESSAGE_MAP() F@Sk=l(  
z<55[~3  
CHookApp::CHookApp() TbD  
{ =8 @DYz'  
 // TODO: add construction code here, .S|7$_9;b  
 // Place all significant initialization in InitInstance sn:VMHrOT  
} M99ku'  
%htI!b+"@  
CHookApp theApp; {V>F69IU  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) (5!'42  
{ y5eEEG6  
 BOOL bProcessed=FALSE; vcu@_N1Dc  
 if(HC_ACTION==nCode) ]\^O(BzB  
 { h_4*?w  
  if((lParam&0xc0000000)==0xc0000000){// Key up p48enH8CO  
   switch(wParam)  _ VuWo  
   { 0V3dc+t)O  
    case VK_MENU: WCsf_1  
     MaskBits&=~ALTBIT; .@)vJtH)  
     break; ^o5;><S]  
    case VK_CONTROL: rB".!b  
     MaskBits&=~CTRLBIT; 1+*sEIC"  
     break; 5/nL[4Z  
    case VK_SHIFT: 2ul8]=  
     MaskBits&=~SHIFTBIT; HU>>\t?d  
     break; m)L50ot:/  
    default: //judge the key and send message ."ZG0Zg  
     break; k'O.1  
   } QtnNc!,n  
   for(int index=0;index<MAX_KEY;index++){ hdw.S`~}%  
    if(hCallWnd[index]==NULL) .4v?/t1  
     continue; qvc< _k^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) W2X`%Tx0  
    { m:)&:Y0 (a  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); W|8VE,"7  
     bProcessed=TRUE; |^Y"*Y4*h  
    } )$TN%hV!  
   } :8@)W<>%  
  } 2p, U ^h  
  else if((lParam&0xc000ffff)==1){ //Key down  p[P# !  
   switch(wParam) f>6{tI 5X  
   { lkT :e)w  
    case VK_MENU: {*+J`H_G2a  
     MaskBits|=ALTBIT; Chnt)N`/B4  
     break; ~NIhS!  
    case VK_CONTROL: CqEbQ>?  
     MaskBits|=CTRLBIT; &fB=&jc*j  
     break; GPLop/6   
    case VK_SHIFT: } iKjef#J  
     MaskBits|=SHIFTBIT; ~B{08%|oK  
     break; 7<WUj K|  
    default: //judge the key and send message 2J t{oh|  
     break; ;l!<A  
   } 3=n6N TL  
   for(int index=0;index<MAX_KEY;index++) V$hL\`e  
   { iHNQxLkk{:  
    if(hCallWnd[index]==NULL) cVx SO`jZw  
     continue; fCUx93,>z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) AwG0E `SU  
    { )dfhy  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ]^"Lc~w8&  
     bProcessed=TRUE; }Ecv6&G  
    } K*5gb^Ul  
   } f@;pN=PS  
  } g "Du]_,  
  if(!bProcessed){ RI8*'~ix]  
   for(int index=0;index<MAX_KEY;index++){ VLm\PS   
    if(hCallWnd[index]==NULL) yJ!26  
     continue; ~4+Y BN  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 'sI ne>  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); O W.CU=XU  
   } w98M #GqV  
  } GAY?F  
 } 1_{e*=/y  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); }i^M<A O  
} *~P| ? D'  
-}<Ru)  
BOOL InitHotkey() !k% PP  
{ o}r_+\n  
 if(hHook!=NULL){ +#wVe  
  nHookCount++; ?n{m2.H  
  return TRUE; "=DQ {(L  
 } WwsNAJ  
 else 3\RD %[}  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ;O)*!yA(GG  
  if(hHook!=NULL) e^ N~)Nlj  
   nHookCount++; kAp#6->(q  
  return (hHook!=NULL); v CsE|eMP  
} xKE=$SV(  
BOOL UnInit() !B Pm{_C  
{ H^kOwmSzh  
 if(nHookCount>1){ O$,  
  nHookCount--; hkl0N%[  
  return TRUE; rrfJs  
 } TY% c`Q5  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ?J2A.x5` a  
 if(unhooked==TRUE){ \LJ!X3TZ  
  nHookCount=0; V/xXW=  
  hHook=NULL; ~.x#ic  
 } %iNgHoH  
 return unhooked; F-ZTy"z  
} 5)Z=FUupA~  
! xM=7Q k  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 4J[zNB]  
{ v`mB82s  
 BOOL bAdded=FALSE; 7ucm1   
 for(int index=0;index<MAX_KEY;index++){ Mhn1-ma:  
  if(hCallWnd[index]==0){ 9~=zD9,|iA  
   hCallWnd[index]=hWnd; O-7)"   
   HotKey[index]=cKey; TI8\qIW  
   HotKeyMask[index]=cMask; rF[-4t %  
   bAdded=TRUE; HgW!Q(*  
   KeyCount++; GmNCw5F  
   break; e~gNGr]L/  
  } ^`#7(S)a/  
 } Y.I~.66s  
 return bAdded; rr,A Vw  
} .s4vJKK0  
;/V])4=  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) FWeUZI+  
{ ~m<K5K6 V  
 BOOL bRemoved=FALSE; (t3gNin  
 for(int index=0;index<MAX_KEY;index++){ DXD+,y\=  
  if(hCallWnd[index]==hWnd){ > A@yF?  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 8Ckd.HKpQ  
    hCallWnd[index]=NULL; .0yBI=QI  
    HotKey[index]=0; *\#<2 QAe  
    HotKeyMask[index]=0; "uuM#@h  
    bRemoved=TRUE; U*{0,Ue'  
    KeyCount--; W2-l_{  
    break; A?04,l]y  
   } v(Kj6'  
  } 0= bXL!]  
 } Q'jGNWep  
 return bRemoved; f9UDH8X  
} Efe(tH2q  
6wpu[  
void VerifyWindow() fk15O_#3  
{ fX:q ]  
 for(int i=0;i<MAX_KEY;i++){ n}Eu^^d  
  if(hCallWnd!=NULL){ :I"2 2EH  
   if(!IsWindow(hCallWnd)){ TT9 \m=7  
    hCallWnd=NULL; k;<@ 2C  
    HotKey=0; ,V j&  
    HotKeyMask=0; :55a9d1bL  
    KeyCount--; RLex#j  
   } 13 L&f\b  
  } 2V;{@k  
 } %w>3Fwj`z  
} 61QA<Wb  
Zc38ht\r;  
BOOL CHookApp::InitInstance() 7)}_'p  
{ j*gZvbO;'L  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); oR`rs[Kj  
 hins=AfxGetInstanceHandle(); }9U_4k  
 InitHotkey(); ;uc3_J]  
 return CWinApp::InitInstance(); a5m[ N'kah  
} ~Fo2MwE2~  
#]^C(qmb:  
int CHookApp::ExitInstance() \kKd:C{  
{ wbr$w>n  
 VerifyWindow(); V%;dTCq  
 UnInit(); R f)|p;  
 return CWinApp::ExitInstance(); XySkm2y  
} f'"PQr^9  
/T  {R\  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ~C>;0a;<:  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) `K@N\VM  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ' xaPahx;  
#if _MSC_VER > 1000 *qL'WrB1  
#pragma once M`Wk@t6>  
#endif // _MSC_VER > 1000 q},,[t  
T1RY1hb|g>  
class CCaptureDlg : public CDialog 9MJ:]F5+  
{ .K-d  
 // Construction 7Q'u>o  
 public: 6)=;cc{Vr  
  BOOL bTray; 6NyUGGRq  
  BOOL bRegistered; F5H*z\/={  
  BOOL RegisterHotkey(); jR:\D_:  
  UCHAR cKey; nfZe"|d  
  UCHAR cMask; e\aW~zs 2  
  void DeleteIcon(); ;B2&#kot7  
  void AddIcon(); rFt +Y})  
  UINT nCount; gkTwGI+w  
  void SaveBmp(); -;6uN\gq  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor r$M<vo6C  
  // Dialog Data &xUCXj2-z  
  //{{AFX_DATA(CCaptureDlg) Wn=I[K&&  
  enum { IDD = IDD_CAPTURE_DIALOG }; t:oq't  
  CComboBox m_Key; BINHCZ  
  BOOL m_bControl; =^Ws/k  
  BOOL m_bAlt; (7,Q4T  
  BOOL m_bShift; c3rj :QK6I  
  CString m_Path; N&G(`]  
  CString m_Number; k[pk R{e  
  //}}AFX_DATA q~iEw#0-L  
  // ClassWizard generated virtual function overrides m=COF$<  
  //{{AFX_VIRTUAL(CCaptureDlg) #68$'Rl"o1  
 public: bM_fuy55Op  
  virtual BOOL PreTranslateMessage(MSG* pMsg); @@R&OR  
 protected: &\5bo=5V  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support fTX|vy<EMI  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 5>e<|@2 X  
  //}}AFX_VIRTUAL YsiH=x  
  // Implementation dKXzFyW  
 protected: #/9Y}2G|]  
  HICON m_hIcon; ? YIe<  
  // Generated message map functions bx6=LK  
  //{{AFX_MSG(CCaptureDlg) 6W]C`  
  virtual BOOL OnInitDialog(); v^t oe  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); )eSQce7H  
  afx_msg void OnPaint(); 1S+T:n  
  afx_msg HCURSOR OnQueryDragIcon(); `z/ p,. u  
  virtual void OnCancel(); tNqSCjQ~_c  
  afx_msg void OnAbout(); c9nv=?/}f  
  afx_msg void OnBrowse(); OFcP4hDi  
  afx_msg void OnChange(); 2.@IfBF6  
 //}}AFX_MSG 2Z"\%ZD  
 DECLARE_MESSAGE_MAP() HpeU'0u0VK  
}; )VG>6x  
#endif GqP02P'2  
zw5Ol%JF  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file |Q%nnN  
#include "stdafx.h" F$|d#ny  
#include "Capture.h" u]9 #d^%V  
#include "CaptureDlg.h" /UR;,ts  
#include <windowsx.h> p? VDBAx  
#pragma comment(lib,"hook.lib") >wYmx4W>  
#ifdef _DEBUG ?caHS2%?ae  
#define new DEBUG_NEW 0;w 4WJJ  
#undef THIS_FILE ?vik2RW  
static char THIS_FILE[] = __FILE__; \SgBI/L^  
#endif wYS r.T8Q  
#define IDM_SHELL WM_USER+1 <ZO+e*4  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); X$%W&:  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); D~Q -:G$x  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; NUh%\{  
class CAboutDlg : public CDialog hVZS6gU,x  
{ =yJV8%pa  
 public: LH@Kn?R6  
  CAboutDlg(); PCH$)F4^  
  // Dialog Data (v0Q.Q@ <  
  //{{AFX_DATA(CAboutDlg) < jX5}@`z  
  enum { IDD = IDD_ABOUTBOX }; NOAz"m+o  
  //}}AFX_DATA Ak}`zIo  
  // ClassWizard generated virtual function overrides elD|b=(-  
  //{{AFX_VIRTUAL(CAboutDlg) c4Q%MRR  
 protected: X VH( zJ  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support .F _u/"**  
  //}}AFX_VIRTUAL 9A`^ (  
  // Implementation v[DxWs8q  
 protected: xj]^<oi<  
  //{{AFX_MSG(CAboutDlg) %bG\  
  //}}AFX_MSG ']^]z".H  
  DECLARE_MESSAGE_MAP() @aB7dtM  
}; "{bc2# F  
!b$~Sm)  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Z#kB+.U  
{ G;pc,\MF  
 //{{AFX_DATA_INIT(CAboutDlg) Cf v1nU W  
 //}}AFX_DATA_INIT :[C|3KKe"  
} M,r8 No  
zSOZr2- ^a  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ?;_Mxal'  
{ +QSH*(,  
 CDialog::DoDataExchange(pDX); G 40  
 //{{AFX_DATA_MAP(CAboutDlg) l['ER$(7  
 //}}AFX_DATA_MAP OSh'b$Z  
} ATV|M[B  
pG v*{.  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) eQfXUpk3@I  
 //{{AFX_MSG_MAP(CAboutDlg) ,RAP_I!_x  
 // No message handlers G}]'}FUp  
 //}}AFX_MSG_MAP A=D G+z''  
END_MESSAGE_MAP() oy=ej+:  
16~5;u  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ?. L]QU  
: CDialog(CCaptureDlg::IDD, pParent) 3CSwcD  
{ ZpwFC7LW  
 //{{AFX_DATA_INIT(CCaptureDlg) {3Dm/u%=9|  
  m_bControl = FALSE; GN+,9  
  m_bAlt = FALSE; !|J2o8g  
  m_bShift = FALSE; raMtTL+  
  m_Path = _T("c:\\"); y8v0>V0)  
  m_Number = _T("0 picture captured."); #zb67mg~  
  nCount=0; Z|3[Y@c \  
  bRegistered=FALSE; nbDjoZZ4  
  bTray=FALSE; +}f}!h;  
 //}}AFX_DATA_INIT JUq7R%"h6  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ciCQe]fS  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); =< P$mFP2*  
} 3Z}KRsp3  
4`?WdCW8  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) +a+DiD>./  
{ $o ;48uV^  
 CDialog::DoDataExchange(pDX); (J j'kW6G6  
 //{{AFX_DATA_MAP(CCaptureDlg) V#~.n ;d  
  DDX_Control(pDX, IDC_KEY, m_Key); >ATccv  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Ma ]*Pled  
  DDX_Check(pDX, IDC_ALT, m_bAlt); UQBc$`v  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Jg6@)<n  
  DDX_Text(pDX, IDC_PATH, m_Path); i\ )$  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 1E$^ul-v  
 //}}AFX_DATA_MAP / !hxW}>^  
} iu`B8yI  
CI|#,^  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) @3?dI@i(  
//{{AFX_MSG_MAP(CCaptureDlg) =vb'T  
 ON_WM_SYSCOMMAND() y*-D  
 ON_WM_PAINT() )jw!, "_4  
 ON_WM_QUERYDRAGICON() 22EI`}"J  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) b C"rQJg  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) k !g%vx  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ca'c5*Fs  
//}}AFX_MSG_MAP o"qG'\x  
END_MESSAGE_MAP() j__l'?s  
lQVK~8t3  
BOOL CCaptureDlg::OnInitDialog() 75c\.=G9q<  
{ TTSq}sb}  
 CDialog::OnInitDialog(); Ge*N%=MX 8  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); LiJ./  
 ASSERT(IDM_ABOUTBOX < 0xF000); 3nx*M=  
 CMenu* pSysMenu = GetSystemMenu(FALSE); x!fRT.,}  
 if (pSysMenu != NULL) <,&t}7M/:  
 { 2bOFH6g  
  CString strAboutMenu; J>+~//C  
  strAboutMenu.LoadString(IDS_ABOUTBOX); zHXb[$ Q  
  if (!strAboutMenu.IsEmpty()) pH396GFIW  
  { $A)[s$  
   pSysMenu->AppendMenu(MF_SEPARATOR); %)y-BdSp.  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); )yS S2  
  } I5W#8g!{  
 } Z07SK ' U  
 SetIcon(m_hIcon, TRUE); // Set big icon (usPAslr  
 SetIcon(m_hIcon, FALSE); // Set small icon -g4 {:!*D  
 m_Key.SetCurSel(0); rKr\Qy+q  
 RegisterHotkey(); j"vL$h  
 CMenu* pMenu=GetSystemMenu(FALSE); KtaoU2s  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); xsx0ZovhY  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 8q|T`ac+N  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); dMa6hI{k  
 return TRUE; // return TRUE unless you set the focus to a control 0G8zFe*p  
} v@qVT'qlU  
x#'v}(v  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) #$u7:p [t  
{ (q=),3/<pU  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) o#V{mm,{Pm  
 { y~py+:_  
  CAboutDlg dlgAbout; -\8v{ry  
  dlgAbout.DoModal(); ;<BMgO}N  
 } CD)JCv  
 else xDn#=%~+x  
 { g 4lk  
  CDialog::OnSysCommand(nID, lParam); F7JF1HfCP  
 } Pq3|O Z  
} US] I[Y6V  
]=(PtzVa  
void CCaptureDlg::OnPaint() rpv<'$6  
{ J|DY /v  
 if (IsIconic()) KKNQ+'?  
 { 2@|,VN V6~  
  CPaintDC dc(this); // device context for painting mN1n/LNi  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); otdm r w|  
  // Center icon in client rectangle +sx$%N  
  int cxIcon = GetSystemMetrics(SM_CXICON); ]Tn""3#1g  
  int cyIcon = GetSystemMetrics(SM_CYICON); mh,a}bX{  
  CRect rect; NoT%z$ 1n  
  GetClientRect(&rect); Dn+hI_"# _  
  int x = (rect.Width() - cxIcon + 1) / 2; 9+I /bl4  
  int y = (rect.Height() - cyIcon + 1) / 2; f_ |=EQ  
  // Draw the icon M[7$F&&n  
  dc.DrawIcon(x, y, m_hIcon); rchKrw  
 } }EN-WDJD\  
 else )^j62uv  
 { >ui;B$=  
  CDialog::OnPaint(); 4ms"mIt  
 } Tvd: P^ C  
} oGz5ZDa#  
G)&S%R!i\N  
HCURSOR CCaptureDlg::OnQueryDragIcon() Nt7z ]F`  
{ \ 9#X]H  
 return (HCURSOR) m_hIcon; *fQn!2}=(  
} !PJp()  
P$&l1Mp  
void CCaptureDlg::OnCancel() #bGYd}BfD  
{ 8Bx58$xRq  
 if(bTray) {Hzj(c~S?  
  DeleteIcon(); ;.3 {}.Y  
  CDialog::OnCancel(); .T#}3C/  
} TPNKvv!s  
JHg y&/  
void CCaptureDlg::OnAbout() UZJ#/x5F  
{ ?vmoRX  
 CAboutDlg dlg; 6T%5<I*&3s  
 dlg.DoModal(); e;9x%kNs!  
} M# cJ&+rP  
K<M WiB&  
void CCaptureDlg::OnBrowse() aq - |  
{ ^m-w@0^z  
 CString str; *s|'V+1  
 BROWSEINFO bi; k\\e`=  
 char name[MAX_PATH]; hpYW1kfQl  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); {2U3   
 bi.hwndOwner=GetSafeHwnd(); bfI= =  
 bi.pszDisplayName=name; ;Swy5z0=ro  
 bi.lpszTitle="Select folder"; 4mnVXKt%.  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; +g_m|LF  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); t\f[->f  
 if(idl==NULL) 5),&{k!  
  return; d2Ta&Md  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); :-oMkBS  
 str.ReleaseBuffer(); C=JS]2W2  
 m_Path=str; A[uB)wWsn  
 if(str.GetAt(str.GetLength()-1)!='\\') .TNGiUzG  
  m_Path+="\\"; Ey{p;;H  
 UpdateData(FALSE); g1@rY0O  
} -#,4rN#  
1P WTbd l  
void CCaptureDlg::SaveBmp() ZP ]Ok  
{ #szIYyk  
 CDC dc; oj@=Cq':-  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); A0bR.*3  
 CBitmap bm; S84S/y  
 int Width=GetSystemMetrics(SM_CXSCREEN); Q;GcV&f;f  
 int Height=GetSystemMetrics(SM_CYSCREEN); u-*z#e_L0  
 bm.CreateCompatibleBitmap(&dc,Width,Height); &ju.5v|  
 CDC tdc; <MoyL1=  
 tdc.CreateCompatibleDC(&dc); ijKQ`}JA  
 CBitmap*pOld=tdc.SelectObject(&bm); dtig_s,)D  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); LQV&;O4'  
 tdc.SelectObject(pOld); 9U Hh#  
 BITMAP btm; * bUOd'vh  
 bm.GetBitmap(&btm); gy xC)br  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; p$cb&NNh*H  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); [}dPn61  
 BITMAPINFOHEADER bih; c-U]3`;Q  
 bih.biBitCount=btm.bmBitsPixel; U^]@0vR  
 bih.biClrImportant=0; cUn>gT  
 bih.biClrUsed=0; `> +:38  
 bih.biCompression=0; Q=Liy@/+!  
 bih.biHeight=btm.bmHeight; o>|DT(Ib  
 bih.biPlanes=1; 8+H 0  
 bih.biSize=sizeof(BITMAPINFOHEADER); H3( @Q^9  
 bih.biSizeImage=size; LMuDda  
 bih.biWidth=btm.bmWidth; 35L\  
 bih.biXPelsPerMeter=0; 4 RfBXVS  
 bih.biYPelsPerMeter=0; ZO>)GR2S  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); uzh TNf  
 static int filecount=0; Z+=-)&L  
 CString name; \["I.gQ  
 name.Format("pict%04d.bmp",filecount++); Q 7\j:.  
 name=m_Path+name; J0B*V0'zR  
 BITMAPFILEHEADER bfh; t%Bh'HkG  
 bfh.bfReserved1=bfh.bfReserved2=0; 00@F?|-j  
 bfh.bfType=((WORD)('M'<< 8)|'B'); x=kJl GT  
 bfh.bfSize=54+size; 9FPqd8(]*V  
 bfh.bfOffBits=54; &MPlSIg  
 CFile bf; u=Xpu,q  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ >< VUly  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); rV} 5&N*c  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ./^8L(  
  bf.WriteHuge(lpData,size); _9q byhS7  
  bf.Close(); ~(B%E'  
  nCount++; ^# 4e_&4  
 } /:"^,i\t  
 GlobalFreePtr(lpData); F{c8{?:  
 if(nCount==1) q_98=fyE6  
  m_Number.Format("%d picture captured.",nCount); +\?+cXSc  
 else yYSoJqj Q  
  m_Number.Format("%d pictures captured.",nCount); W8r"dK  
  UpdateData(FALSE); Y#6LNI   
} Z4E6J'B8  
(:\L@j  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) J #jFX F\  
{ <N>7.G  
 if(pMsg -> message == WM_KEYDOWN) A.h0H]*Ma  
 { %@|)&][hO  
  if(pMsg -> wParam == VK_ESCAPE) @Ae&1O;Zh  
   return TRUE; m(D-?mhL  
  if(pMsg -> wParam == VK_RETURN) v`G}sgn  
   return TRUE; lCBH3-0^  
 } *{5/" H5  
 return CDialog::PreTranslateMessage(pMsg); Qvel#*-4  
} J3e'?3w[  
%9J:TH9E)  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) |_QpB?b  
{ d1D=R8P_u  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ W; os4'h$  
  SaveBmp(); VJl0UM3{J  
  return FALSE; R%q:].  
} yu&muCA  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Qwve-[  
 CMenu pop; 2aX$7E?  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); .mcohfR  
 CMenu*pMenu=pop.GetSubMenu(0); ~wOMT  
 pMenu->SetDefaultItem(ID_EXITICON); E9Dy)f]#W  
 CPoint pt; ecO$L<9>  
 GetCursorPos(&pt); hwQ|'^(@O  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); W]_a_5  
 if(id==ID_EXITICON) l*huKSX}  
  DeleteIcon(); QDVSFGwr  
 else if(id==ID_EXIT) <a&xhG}  
  OnCancel();  R0F [  
 return FALSE; y?A*$6  
} -B! a O65^  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); r!w*y3  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Iza;~8dH5  
 AddIcon(); U2tgBF?)A  
 return res; Cbl>eKw  
} [*I7^h%  
zAvI f  
void CCaptureDlg::AddIcon() ?^MH:o  
{ .IVKgQ B  
 NOTIFYICONDATA data; "gzn%k[D9m  
 data.cbSize=sizeof(NOTIFYICONDATA); 'HCRi Z<  
 CString tip; 8 nqF i  
 tip.LoadString(IDS_ICONTIP); %e)vl[:}  
 data.hIcon=GetIcon(0); G#@#j]8  
 data.hWnd=GetSafeHwnd(); RlU?F  
 strcpy(data.szTip,tip); `ZO5-E  
 data.uCallbackMessage=IDM_SHELL; Pgq(yPC  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; SG&H^V8  
 data.uID=98; Eza^Tbq%j?  
 Shell_NotifyIcon(NIM_ADD,&data); /v| b]Ji  
 ShowWindow(SW_HIDE); J7e /+W~  
 bTray=TRUE; m^0 I3;  
} =CS$c?  
*f{4 _ts  
void CCaptureDlg::DeleteIcon() ,KF>@3f  
{ 6 OvH"/X4  
 NOTIFYICONDATA data; zlTLp-^Y  
 data.cbSize=sizeof(NOTIFYICONDATA); SB5qm?pT8<  
 data.hWnd=GetSafeHwnd(); yd'cLZd<}  
 data.uID=98; B# .xs>{N  
 Shell_NotifyIcon(NIM_DELETE,&data); H4{7,n  
 ShowWindow(SW_SHOW); 'O9Yu{M  
 SetForegroundWindow(); DYC2bs>  
 ShowWindow(SW_SHOWNORMAL); UEm4):/}  
 bTray=FALSE; g2*}XS 3  
} N1'Yo:_A  
 xB?!nd  
void CCaptureDlg::OnChange() @{Fa=".Ch  
{ l&"bm C:xr  
 RegisterHotkey(); v&%W*M0q@  
} xdY'i0fh  
I$)9T^Ra  
BOOL CCaptureDlg::RegisterHotkey() PJe \PGh  
{ :B|rs&  
 UpdateData(); #)#'^MZX  
 UCHAR mask=0;  2t  
 UCHAR key=0; ;A*sub  
 if(m_bControl) W?.xtQEv  
  mask|=4; K:Z,4Y  
 if(m_bAlt) A)d0Z6G`  
  mask|=2; E5c)\ D  
 if(m_bShift) <5CQ#^ cK  
  mask|=1; e%{7CR'~TD  
  key=Key_Table[m_Key.GetCurSel()]; @T.F/Pjhc  
 if(bRegistered){ 9)j"|5H  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); KBI 1t$  
  bRegistered=FALSE; t=p"nIE  
 }  :J)^gc  
 cMask=mask; FT}^Fi7  
 cKey=key; %$Q!'+YW  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask);  #.Ly  
 return bRegistered; 4"{g{8  
} //Xz  
v]KPA.W  
  四、小结 YY'[PXP$Y  
YYkgm:[  
  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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