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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: |f~p3KCfV  
  5xHl6T+  
  一、实现方法 r=+r5k"`  
H{P"$zj`l  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: M+ gYKPP  
'qhA4W9  
#pragma data_seg("shareddata") <c6C+OWT,  
HHOOK hHook =NULL; //钩子句柄 k]"Rg2>%  
UINT nHookCount =0; //挂接的程序数目 ,g$N  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Ee##:I[z  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 X] /r'Tz  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey s Hu~;)  
static int KeyCount =0; '@iS5Fni  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ~J6c1jG  
#pragma data_seg() ;%#@vXH[Oo  
Ss&R!w9p  
  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。 jv]:`$}G\  
'+ |{4-V  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 4 |N&Y  
% ;2x.  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Nze#u;  
cKey,UCHAR cMask) {q"l|Oe  
{ E#T-2^nD  
 BOOL bAdded=FALSE; ?zNv7Bj  
 for(int index=0;index<MAX_KEY;index++){ (+9_nAgZ,  
  if(hCallWnd[index]==0){ HQ+:0" B  
   hCallWnd[index]=hWnd; xS,#TU;)Ol  
   HotKey[index]=cKey; |YQ:4'^"  
   HotKeyMask[index]=cMask; F[c;iM(^  
   bAdded=TRUE; n}yqpW!%n  
   KeyCount++; q"A(l  
   break; d7u"Z5t  
  } h?DMrYk_%#  
 } )=X8kuB~  
 return bAdded; 1k\1U  
} 3e:"tus~  
//删除热键 ?(!$vqS`f(  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;{ Y|n_  
{ UtiS?w6  
 BOOL bRemoved=FALSE; :D?%!Q 0  
 for(int index=0;index<MAX_KEY;index++){ y2^r.6"O  
  if(hCallWnd[index]==hWnd){ Sj}@5 X6 C  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ t.>vLzrU  
    hCallWnd[index]=NULL; ;EE*#"IJ  
    HotKey[index]=0; xk}YeNVj  
    HotKeyMask[index]=0; lBL;aTzo  
    bRemoved=TRUE; ^;$f-e  
    KeyCount--; e4ajT  
    break; h.g11xa  
   } LC\Ys\/,U  
  } | 9!3{3  
 } Vrf` :%  
 return bRemoved; d;(L@9HHD  
} pP)0 l  
/H,!7!6>?  
~y^#?;  
  DLL中的钩子函数如下: U,+kV?Z  
z_< 7T4  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) %"DEgI P  
{ 6lq7zi}'w  
 BOOL bProcessed=FALSE; z8= Gc$w!  
 if(HC_ACTION==nCode) >OwVNG  
 { U\ y?P:yy  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 p(~>u'c  
   switch(wParam) ZsUxO%jP  
   {  :j vx-jQ  
    case VK_MENU: ?ae:9ZcH  
     MaskBits&=~ALTBIT; ZQnJTS+Rd  
     break; M&y!w   
    case VK_CONTROL: #=b_!~:%  
     MaskBits&=~CTRLBIT; ((Ec:(:c  
     break; I [0od+K  
    case VK_SHIFT: ]{nFB3vtB  
     MaskBits&=~SHIFTBIT; ,$sq]_t  
     break; Sy'/%[+goJ  
    default: //judge the key and send message l8%x(N4  
     break; iH( K[F /  
   } W UdKj  
   for(int index=0;index<MAX_KEY;index++){ OsAXHjX}  
    if(hCallWnd[index]==NULL) czb(&><  
     continue; QO7 > XHn  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5}~*,_J2Z  
    { oFHVA!lqe  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 91%+Bf()J6  
     bProcessed=TRUE; q[1H=+  
    } }` Q'!_`  
   } d^Ra1@0"q2  
  } o~gduNG#  
  else if((lParam&0xc000ffff)==1){ //有键按下 rr*",a"}m  
   switch(wParam) r[ ' T.yo  
   { 0d:t$2~C  
    case VK_MENU: :4<+)r26  
     MaskBits|=ALTBIT; s>"=6gb  
     break; 2sy{  
    case VK_CONTROL: [t<^WmgtxL  
     MaskBits|=CTRLBIT; #'^p-Jdm  
     break; Yiu)0\ o  
    case VK_SHIFT: Q9 kKk  
     MaskBits|=SHIFTBIT; ^;NM'Z  
     break; 1B6Go  
    default: //judge the key and send message ;MCv  
     break; dj?.Hc7od  
   } //e.p6"8h  
   for(int index=0;index<MAX_KEY;index++){ _w^p~To^  
    if(hCallWnd[index]==NULL) /+sn -$/"i  
     continue;  rc*3k  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 7-w +/fv  
    { W&z.O  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); >('L2]4\v  
     bProcessed=TRUE; :{LVS nG  
    } &.=d,XKN  
   } A T+|}B!  
  } ZGzrh`j{-  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 }9:\#  
   for(int index=0;index<MAX_KEY;index++){ }&rf'E9  
    if(hCallWnd[index]==NULL) fbwo2qe@K  
     continue; }^?dK3~q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 68Wm=j.m  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 6H VS0  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 s3_i5,y  
   } Z=R>7~H  
  } Trbgg  
 } =d7lrx+z  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); zBB4lC{q  
} "KW\:uc /  
QCa$<~c  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: >efYpd#^  
//Hn[wEOh  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); -YA1Uk  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Kdx?s;i  
,, ]y 8P  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: tV*g1)'zX  
}.o rfW  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) _9#4  
{ (LTm!"Q  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) U&wVe$  
 { %=S^{A  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ;r^8In@6  
  SaveBmp(); 6g@j,iFy  
  return FALSE; ^z9ITGB~tV  
 } l0tMdsz  
 …… //其它处理及默认处理 h k(2,z  
} 3UD_2[aqN(  
wRnt$ 1  
e0j*e7$  
  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。 k-Jj k3  
<|hvH  
  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。 BA A)IQF  
}n:'@}  
  二、编程步骤 b,KQG|k  
T9RR. ng  
  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"; "p#mNc  
H:,rNaz7D^  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; jp=^$rS6[  
x?va26FV  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; bH3-#mw5w  
?%;7k'0"  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; %Ni)^   
i?qS8h{  
  5、 添加代码,编译运行程序。 9d#-;qV  
HR\yJt  
三、程序代码 < I8hy$+6  
{/XzIOO;b  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL .FqbX5\p,  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) !wJ~p:vRdY  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ B6MMn.  
#if _MSC_VER > 1000 ysGK5kFz  
#pragma once asj^K|.z  
#endif // _MSC_VER > 1000 -?2ThvT  
#ifndef __AFXWIN_H__ ~-A5h(  
#error include 'stdafx.h' before including this file for PCH yGZb  
#endif $khWu>b  
#include "resource.h" // main symbols g>/,},jv[x  
class CHookApp : public CWinApp s$ &:F4=?  
{ P3on4c  
 public: 'r(}7>~fC  
  CHookApp(); -XkCbxZ  
  // Overrides !RFlv  
  // ClassWizard generated virtual function overrides ,K+K`"Oy  
  //{{AFX_VIRTUAL(CHookApp) (/v(.t  
 public: 9{'GrL  
  virtual BOOL InitInstance(); Jq<&`6hn  
  virtual int ExitInstance(); Ad9'q!_en  
  //}}AFX_VIRTUAL F.c,FR2  
  //{{AFX_MSG(CHookApp) #J)sz,)(  
  // NOTE - the ClassWizard will add and remove member functions here. \a<qI  
  // DO NOT EDIT what you see in these blocks of generated code ! \gDf&I  
  //}}AFX_MSG jC@$D*"J  
  DECLARE_MESSAGE_MAP() &]ts*qCEL  
}; ]6GdB3?UVM  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); &Jk0SUk MP  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8JJqEkQ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); s34{\/'D+  
BOOL InitHotkey(); Gi6sl_"q  
BOOL UnInit(); h-<('w:A  
#endif 5^ARC^v  
;&s`g   
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. BCJo/m  
#include "stdafx.h" aVNRhnM  
#include "hook.h" *6df|q  
#include <windowsx.h> ,gUSW  
#ifdef _DEBUG DJS0;!# |O  
#define new DEBUG_NEW L1VUfEG-  
#undef THIS_FILE ?y>P  
static char THIS_FILE[] = __FILE__; .Quu_S_ vH  
#endif jdK~]eld=  
#define MAX_KEY 100 !0zbWB9  
#define CTRLBIT 0x04 z{]$WVs:^  
#define ALTBIT 0x02 &;&i#ZO  
#define SHIFTBIT 0x01 3yszf Wr  
#pragma data_seg("shareddata") 58DkVQ6  
HHOOK hHook =NULL; $.a<b^.Xi  
UINT nHookCount =0; 4`I2tr  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey T4]/w|?G  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT p^3 ]Q  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey aqQ YU5l4~  
static int KeyCount =0; cV\(Z6u  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift lG I1LUo  
#pragma data_seg() Ynl^Z  
HINSTANCE hins; MCZTeYnx  
void VerifyWindow(); ai)S:2  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) [a:yKJ[  
//{{AFX_MSG_MAP(CHookApp) r{!]` '8  
// NOTE - the ClassWizard will add and remove mapping macros here. t3|If@T  
// DO NOT EDIT what you see in these blocks of generated code! 8UJK]_99I,  
//}}AFX_MSG_MAP \T `InBbf  
END_MESSAGE_MAP() #k&"R v;,  
0"ksNnxK  
CHookApp::CHookApp() m2F2  
{ t~H'Ugv^  
 // TODO: add construction code here, cKJf0S:cx-  
 // Place all significant initialization in InitInstance tJ>%Xop  
} O-J;iX}  
b`){f\#t  
CHookApp theApp; <o@&I " o  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 5\gL+ qM0  
{ D99g}  
 BOOL bProcessed=FALSE; `% IzW2v6  
 if(HC_ACTION==nCode) -^LUa]"E  
 { ` Fnl<C<  
  if((lParam&0xc0000000)==0xc0000000){// Key up t2skg  
   switch(wParam) !~Gx@Ro  
   { :)o 4fOJ8  
    case VK_MENU: -sO[,  
     MaskBits&=~ALTBIT; sU!h^N$  
     break; Rah"La  
    case VK_CONTROL: Cuu yG8  
     MaskBits&=~CTRLBIT; d` %8qLIW  
     break; 1/X@~  
    case VK_SHIFT: r<VZE bm)  
     MaskBits&=~SHIFTBIT; kW#,o9f\  
     break; 5$f vI#NO<  
    default: //judge the key and send message Uc%n{ a-a  
     break; %IrR+f+H  
   } eRU0gvgLu"  
   for(int index=0;index<MAX_KEY;index++){ p4mi\~Q  
    if(hCallWnd[index]==NULL) 4wYD-MB  
     continue; l r80RL'_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) vUm#^/#I  
    { 'D`O4TsP>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ).U\,@[A{  
     bProcessed=TRUE; ~puXZCatN  
    } gZA[Sq  
   } Hdvtgss!  
  } HYcLXhvgu  
  else if((lParam&0xc000ffff)==1){ //Key down o>WB,i^G  
   switch(wParam) <Qg).n>;z  
   { 8(-V pU  
    case VK_MENU: ffoL]u\  
     MaskBits|=ALTBIT; 4<V%7z_.B  
     break; 3y^PKIIrt  
    case VK_CONTROL: %Ms"LoK  
     MaskBits|=CTRLBIT; X$*MxMNs  
     break; dbn9t7'{  
    case VK_SHIFT: L\0;)eJ#M  
     MaskBits|=SHIFTBIT; LLyw9y1  
     break; %+ln_lgD:  
    default: //judge the key and send message ot\  FZ  
     break; UWU(6J|Fk  
   } q4u,pm,@  
   for(int index=0;index<MAX_KEY;index++) xgDd5`W  
   { 5OEo(&  
    if(hCallWnd[index]==NULL) a8 X}r.  
     continue; #IJm*_J<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 44Dytpvg  
    { AWaptw_p*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); CFE  ubEb  
     bProcessed=TRUE; &T.d"i  
    } A]0A,A0  
   } !8g419Yg  
  } hcn $uyP  
  if(!bProcessed){ /my5s\;s|z  
   for(int index=0;index<MAX_KEY;index++){ ')R+Z/hG.  
    if(hCallWnd[index]==NULL) rA+UftC:p6  
     continue; SEfRU`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) r]q;>\T'  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); uu7 ?,WT  
   } ),{v  
  } F}1h  
 } 7 bV(eV  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); @jL](Mq|]  
} 5Zf^cou  
B":9C'tip  
BOOL InitHotkey() ML_$/  
{ ATQw=w 3W  
 if(hHook!=NULL){ V}3'0  
  nHookCount++; zH"a>+st=  
  return TRUE; }K .Rv(m  
 } |>^5G@e  
 else H1GmC`\<[:  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); [T |P|\M  
  if(hHook!=NULL) kM6i{{Q  
   nHookCount++; J#.f%VJ  
  return (hHook!=NULL); Ky0}phGRu  
} D\:dn  
BOOL UnInit() ^VC /tJ  
{ # &,W x  
 if(nHookCount>1){ }Q2v~eD  
  nHookCount--; 7xF)\um  
  return TRUE; ]?< wUd  
 } U g:  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ?F6L,  
 if(unhooked==TRUE){ awXK9}.  
  nHookCount=0; +3yG8  
  hHook=NULL; L@5sY0 M  
 } gmUXh;aHc  
 return unhooked; A%[e<vj9  
} reQr=OAez  
sYEh>%mo^C  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 8Y]% S9.  
{ qX[{_$^Q  
 BOOL bAdded=FALSE; >&DC[)28  
 for(int index=0;index<MAX_KEY;index++){ pV8_i7\  
  if(hCallWnd[index]==0){ nND; lVQSO  
   hCallWnd[index]=hWnd; Z~0TO-Q  
   HotKey[index]=cKey; `uKsFX M  
   HotKeyMask[index]=cMask; vjL +fH<0:  
   bAdded=TRUE; !>:SPt l  
   KeyCount++; _<E.?K$gbU  
   break; ZZ>"LH  
  } {|d28!8w  
 } M(^_/ 1Z  
 return bAdded; 9 NGKh3V  
}  )[S#:PP  
r>e1IG  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) $7QGi|W*k  
{ l k sNy  
 BOOL bRemoved=FALSE; ~6"=d  
 for(int index=0;index<MAX_KEY;index++){ {q/;G!ON.S  
  if(hCallWnd[index]==hWnd){ $`A{-0=x\U  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ S$O5jX 0  
    hCallWnd[index]=NULL; L6?~<#-m\M  
    HotKey[index]=0; 7|HIl=  
    HotKeyMask[index]=0; YQ$LU \:  
    bRemoved=TRUE; "S]G+/I|iw  
    KeyCount--; kwXUjn p  
    break; $>8O2p7W  
   } >\!G43Q=  
  } Z2U6<4?1%  
 } upLjkQ)_  
 return bRemoved; XU`ly3!  
} &^UT  
PNo9.-@G  
void VerifyWindow() ew \WV "  
{ qeW.~B!B  
 for(int i=0;i<MAX_KEY;i++){ EI9;J-c  
  if(hCallWnd!=NULL){ x8xz33  
   if(!IsWindow(hCallWnd)){ <NEz{1Z  
    hCallWnd=NULL; 85f:!p  
    HotKey=0; 5DpvMhc_  
    HotKeyMask=0; !kG|BJ$j  
    KeyCount--; naro  
   } }S$OE))u  
  } YV8PybThc  
 } 7K HQ0  
} \@Gcx}Y8h  
~,_@|,)  
BOOL CHookApp::InitInstance() BbM/Rd1tAm  
{ 1V wcJd  
 AFX_MANAGE_STATE(AfxGetStaticModuleState());  _!_^B  
 hins=AfxGetInstanceHandle(); 'yosDT2{#  
 InitHotkey(); Hd\. ,2a"  
 return CWinApp::InitInstance(); f}~=C2R1<!  
} Q #X'.](1  
<O1os"w  
int CHookApp::ExitInstance() K.=5p/^a  
{ .VR ~[aD  
 VerifyWindow(); ;PB_ @Zg  
 UnInit(); +1a3^A\  
 return CWinApp::ExitInstance(); M&jlUr&l  
} QE8 `nMf  
m2H?VY .^K  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file g[R4/]K^$  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) |ZM>UJ  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 9[`c"Pd  
#if _MSC_VER > 1000 Lu~E5 ,  
#pragma once 6g\hQ\+Z}  
#endif // _MSC_VER > 1000 -dWg1`;  
diNAT`|?#  
class CCaptureDlg : public CDialog .p]r S =#  
{ Dpwqg3,  
 // Construction #K`0b$  
 public: V%{WH}  
  BOOL bTray; ek.@ 0c  
  BOOL bRegistered; rq^%)tR  
  BOOL RegisterHotkey(); =k*XGbU  
  UCHAR cKey; mr2Mu  
  UCHAR cMask; k+%&dEE|vH  
  void DeleteIcon(); ?(U a+*b  
  void AddIcon(); 73 4t  
  UINT nCount; U{KnjoS  
  void SaveBmp(); <@# g2b  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Y]=k"]:%  
  // Dialog Data "hQGk  
  //{{AFX_DATA(CCaptureDlg) cRMyYdJ o  
  enum { IDD = IDD_CAPTURE_DIALOG }; q`'"+`h  
  CComboBox m_Key; t`'jr=e,~  
  BOOL m_bControl; LXWI'nxV  
  BOOL m_bAlt; qco uZO  
  BOOL m_bShift; %Oo f/q  
  CString m_Path; D)bL;h  
  CString m_Number; xFekSH7[F  
  //}}AFX_DATA (c&%1bJ  
  // ClassWizard generated virtual function overrides IBvn q8\  
  //{{AFX_VIRTUAL(CCaptureDlg) S8B?uU  
 public: ZqdoYU'  
  virtual BOOL PreTranslateMessage(MSG* pMsg); s_}6#;  
 protected: ZPY&q&R  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support >&Oql9_  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); u;]xAr1  
  //}}AFX_VIRTUAL `a:3S@n(}  
  // Implementation k$ T  
 protected: ;X a N  
  HICON m_hIcon; AAs&P+;  
  // Generated message map functions zRa2iCi  
  //{{AFX_MSG(CCaptureDlg) ar\ K8mj  
  virtual BOOL OnInitDialog(); *7-rm  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ' tHa5`  
  afx_msg void OnPaint();  VM:|I~gJ  
  afx_msg HCURSOR OnQueryDragIcon();  }JWkV1  
  virtual void OnCancel(); 0{uaSR  
  afx_msg void OnAbout(); 9R2"(.U  
  afx_msg void OnBrowse(); /Wcx%P  
  afx_msg void OnChange(); n*Dn{ 7v#z  
 //}}AFX_MSG 'l`prp3  
 DECLARE_MESSAGE_MAP() O@ H.k<zn  
}; 6bc\ )n`  
#endif @D !*@M6  
\gkhSL q  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file x@QNMK.7  
#include "stdafx.h" 'e*w8h  
#include "Capture.h" vG.KSA  
#include "CaptureDlg.h"  BdiV  
#include <windowsx.h> ~ +>e hU  
#pragma comment(lib,"hook.lib") P[-do  
#ifdef _DEBUG ?pfr^ !@$  
#define new DEBUG_NEW _9t1 aP5  
#undef THIS_FILE XXhN; -p  
static char THIS_FILE[] = __FILE__; n-xdyJD  
#endif _'ebXrbZB  
#define IDM_SHELL WM_USER+1 dCS f$5  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ]jm:VF]4  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ?]D))_|G  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; utBrH  
class CAboutDlg : public CDialog P$0c{B4I  
{ b- e  
 public: iF MfBg  
  CAboutDlg(); nT}Wx/aT  
  // Dialog Data F81EZ/  
  //{{AFX_DATA(CAboutDlg) i9De+3VqKK  
  enum { IDD = IDD_ABOUTBOX }; @&E IH,c  
  //}}AFX_DATA ,Pcg+^A  
  // ClassWizard generated virtual function overrides [FrLxU  
  //{{AFX_VIRTUAL(CAboutDlg) 0 }qlZFB  
 protected: @MB)B5  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support `Fo/RZOW  
  //}}AFX_VIRTUAL gpf0 -g-X  
  // Implementation ;3wO1'=  
 protected: H<n"[u^@E  
  //{{AFX_MSG(CAboutDlg) fqY'Uq$=  
  //}}AFX_MSG p4MWX12  
  DECLARE_MESSAGE_MAP() '8\9@wzv  
}; D*[J rq,  
[`qdpzUp&  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) d23=WNn  
{ %7}j|eS)G  
 //{{AFX_DATA_INIT(CAboutDlg) 9]w?mHslE  
 //}}AFX_DATA_INIT K)wWqC.  
} PU,$YPrZ  
X?[ )e  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) CYQ)'v  
{ G%: 3.:E"  
 CDialog::DoDataExchange(pDX); (YYg-@IO  
 //{{AFX_DATA_MAP(CAboutDlg) GVJ||0D  
 //}}AFX_DATA_MAP ;Su-Y!&%  
} ![_0GFbT  
xQDQgvwa  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) HnKgD:  
 //{{AFX_MSG_MAP(CAboutDlg) _fu <`|kc  
 // No message handlers bKGX> %-  
 //}}AFX_MSG_MAP H!Q72tyo  
END_MESSAGE_MAP() ZK'46lh  
CX{6  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 9$z$yGjl  
: CDialog(CCaptureDlg::IDD, pParent) Vc;[0iB  
{ L;$>SLl,  
 //{{AFX_DATA_INIT(CCaptureDlg) ?#xm6oe#aH  
  m_bControl = FALSE; t1o 6;r K  
  m_bAlt = FALSE; T:Nk9t$W7@  
  m_bShift = FALSE; 1S!}su,uH  
  m_Path = _T("c:\\"); >@Ht*h{~  
  m_Number = _T("0 picture captured."); qf\W,SM  
  nCount=0; [bP^RY:  
  bRegistered=FALSE; eBnx$  
  bTray=FALSE; tx>7?e8E  
 //}}AFX_DATA_INIT E5)0YYjHZ  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 9l &q}  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 6V]m0{:E  
} :,aY|2si  
Sk>=C0f:  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) !|xB>d q?  
{ t~j 6wsx;  
 CDialog::DoDataExchange(pDX); \q1tT!]  
 //{{AFX_DATA_MAP(CCaptureDlg) $1|E(d1  
  DDX_Control(pDX, IDC_KEY, m_Key); Vez8 ~r3  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); HrvyI)4{  
  DDX_Check(pDX, IDC_ALT, m_bAlt); WIf.;B)L  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); [ UI>SN  
  DDX_Text(pDX, IDC_PATH, m_Path); ;[R6rVHe{  
  DDX_Text(pDX, IDC_NUMBER, m_Number); :tU^  
 //}}AFX_DATA_MAP X:g5;NT  
} > d p/  
0LH6G[  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) wCNn/%C  
//{{AFX_MSG_MAP(CCaptureDlg) I ]ZZN6"  
 ON_WM_SYSCOMMAND() *YeQC t-l  
 ON_WM_PAINT() jBYv Oy*$Q  
 ON_WM_QUERYDRAGICON() 15Mtlb  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) h Fv{?v  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) oH%[8!#  
 ON_BN_CLICKED(ID_CHANGE, OnChange) I{g.V|+ x  
//}}AFX_MSG_MAP ApeqbD5g&  
END_MESSAGE_MAP() IoLi7NKw  
s__xBY  
BOOL CCaptureDlg::OnInitDialog() sV a0eGc  
{ \Dq'~ d  
 CDialog::OnInitDialog(); rN} 8~j  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); KoNu{TJ  
 ASSERT(IDM_ABOUTBOX < 0xF000); N~8H\  
 CMenu* pSysMenu = GetSystemMenu(FALSE); )8W! |  
 if (pSysMenu != NULL) h>\C2Q  
 { P\ke%Jdpw?  
  CString strAboutMenu; /ki-Tha  
  strAboutMenu.LoadString(IDS_ABOUTBOX); XlU\D}zS  
  if (!strAboutMenu.IsEmpty()) "Esl I  
  { K$h\<_V  
   pSysMenu->AppendMenu(MF_SEPARATOR); y'!OA+ob  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); H)D|lt5xy  
  } dE_Xd :>  
 } l EFd^@t  
 SetIcon(m_hIcon, TRUE); // Set big icon H575W"53  
 SetIcon(m_hIcon, FALSE); // Set small icon _P qq*  
 m_Key.SetCurSel(0); Uw.')ZY=  
 RegisterHotkey(); Z5 IWoY  
 CMenu* pMenu=GetSystemMenu(FALSE); bKCE;Wu:G  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ;F"!$Z/  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); MIIl+   
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); y ;[~(Yg[  
 return TRUE; // return TRUE unless you set the focus to a control js81@WX!c  
} H u;"TG  
G9Uc }z  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) -/JEKw c  
{ `-pwP  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) baII!ks  
 { hYkk r&  
  CAboutDlg dlgAbout; }b(h D|e  
  dlgAbout.DoModal(); Th9V8Rg+E  
 } W`G bo uxd  
 else ?^%[*OCCC!  
 { "frZ%mv  
  CDialog::OnSysCommand(nID, lParam); bzNnEH`^]  
 } ?`U_|Yo  
} xOe1v9<  
UGO;5!  
void CCaptureDlg::OnPaint() XMI*obS'z  
{ ]LC4rS  
 if (IsIconic()) hI86WP9*  
 { F0U %m   
  CPaintDC dc(this); // device context for painting }MRgNr'k  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); s0?'mC+p  
  // Center icon in client rectangle Qt+D ,X  
  int cxIcon = GetSystemMetrics(SM_CXICON); larv6ncV  
  int cyIcon = GetSystemMetrics(SM_CYICON); Dz~0(  
  CRect rect; Jj \ nye+  
  GetClientRect(&rect); hUlRtt  
  int x = (rect.Width() - cxIcon + 1) / 2; Zt3sU_  
  int y = (rect.Height() - cyIcon + 1) / 2; a|u#w~  
  // Draw the icon ZTzec zXpQ  
  dc.DrawIcon(x, y, m_hIcon); '\#q7YjaL  
 } IEy$2f>Ns  
 else YP02/*'  
 { gt}Atr6>_  
  CDialog::OnPaint(); DA "V)  
 } <=7nTcO~  
} eVfD&&@  
y]jx-w c3O  
HCURSOR CCaptureDlg::OnQueryDragIcon() L[2qCxB'^  
{ z[c8W@OJ  
 return (HCURSOR) m_hIcon; ta)gOc)r R  
} 5?>4I"ne  
KY  
void CCaptureDlg::OnCancel() k _V+;&:%  
{ D", L.  
 if(bTray) oDA'$]UL  
  DeleteIcon(); gGVt ( ^  
  CDialog::OnCancel(); #H~55))F  
} ,/+Mp  
2X2Ax~d@  
void CCaptureDlg::OnAbout() F|F0#HC ?  
{ yQrgOdo,w  
 CAboutDlg dlg; < c^'$  
 dlg.DoModal(); cn} CI  
} +yO) 3  
Wa^Wn +r  
void CCaptureDlg::OnBrowse() #'&-S@/nQs  
{ -w"I  
 CString str; o!BCR:  
 BROWSEINFO bi; LLTr+@lj  
 char name[MAX_PATH]; QPf\lN/$4d  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); _;PQt" ]  
 bi.hwndOwner=GetSafeHwnd(); !}*vM@)1  
 bi.pszDisplayName=name; 1-p#}VX  
 bi.lpszTitle="Select folder"; SSF:PTeG>  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; i`sZP#h  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); h2zSOY{su  
 if(idl==NULL) LG,?,%_s  
  return; |-=-/u1  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); j_rO_m<8  
 str.ReleaseBuffer(); :(~<BiqR(  
 m_Path=str; nN{DO:_o  
 if(str.GetAt(str.GetLength()-1)!='\\') RkG?R3e  
  m_Path+="\\"; P}Ig6^[m\  
 UpdateData(FALSE); j>JBZ#g  
} d8: $ll  
}6[jJ`=gOx  
void CCaptureDlg::SaveBmp() _|C3\x1c  
{ h/\v+xiF  
 CDC dc; y05!-G:Y\  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); %_Vz0 D! 7  
 CBitmap bm; HAO-|=c4  
 int Width=GetSystemMetrics(SM_CXSCREEN); K7&]| ^M9  
 int Height=GetSystemMetrics(SM_CYSCREEN); HHx:s2G  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 6h/!,j0:t_  
 CDC tdc; ^ZsIQ4@`  
 tdc.CreateCompatibleDC(&dc); F[\T'{  
 CBitmap*pOld=tdc.SelectObject(&bm); t_Eivm-,B  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); js"Yh  
 tdc.SelectObject(pOld); J0IKI,X.  
 BITMAP btm; _W(xO |,M  
 bm.GetBitmap(&btm); R WY>`.su  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; rwDLBpk  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ??nT[bhQ  
 BITMAPINFOHEADER bih; _]*[TGap  
 bih.biBitCount=btm.bmBitsPixel; Mt4]\pMUb  
 bih.biClrImportant=0; HCOsVTl,  
 bih.biClrUsed=0; c(hC'Cp  
 bih.biCompression=0; "T5jz#H#/  
 bih.biHeight=btm.bmHeight; qOG@MR(5  
 bih.biPlanes=1; ByjfPb#  
 bih.biSize=sizeof(BITMAPINFOHEADER); ]B(}^N>WH  
 bih.biSizeImage=size; l#cVQ_^"  
 bih.biWidth=btm.bmWidth; Kc]cJ`P4.  
 bih.biXPelsPerMeter=0; mdL T7  
 bih.biYPelsPerMeter=0; k`>qb8,  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); R,D/:k'~k  
 static int filecount=0; '~ b  
 CString name; Ut~YvWc9  
 name.Format("pict%04d.bmp",filecount++); -!+i ^r  
 name=m_Path+name; BMAWjEr  
 BITMAPFILEHEADER bfh; i-0 :Fs  
 bfh.bfReserved1=bfh.bfReserved2=0; *P *.'XM  
 bfh.bfType=((WORD)('M'<< 8)|'B'); :c]y/lQmV  
 bfh.bfSize=54+size; g[i;>XyP  
 bfh.bfOffBits=54; a)2l9  
 CFile bf; D7pQWlN\  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Y_*KAr'{P  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); @GAj%MK$  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 'dwsm7Xd  
  bf.WriteHuge(lpData,size); 5L6.7}B  
  bf.Close(); $!G|+OuTR  
  nCount++; umP nw  
 } !"phz&E5ah  
 GlobalFreePtr(lpData); }%wP^6G*x\  
 if(nCount==1) ^e "4@O"  
  m_Number.Format("%d picture captured.",nCount); ,eebO~7vB  
 else \|X 1  
  m_Number.Format("%d pictures captured.",nCount); #p=+RTZ<  
  UpdateData(FALSE); W\<OCD%X  
} `ci  P  
1Mq"f 7X8  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) suQ`a_ zJ  
{ 0e>?!Z E  
 if(pMsg -> message == WM_KEYDOWN) L~+aD2 E {  
 { q:up8-LAr  
  if(pMsg -> wParam == VK_ESCAPE) J-=fy^S5  
   return TRUE; :D}?H@(69  
  if(pMsg -> wParam == VK_RETURN) mKM[[l&A  
   return TRUE; b^i$2$9_  
 } 2FL_!;p;2E  
 return CDialog::PreTranslateMessage(pMsg); 1;./e&%%  
} vyc<RjS_x  
\W_ Dz*N  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ++w{)Io Z  
{ ~+ae68{p  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ aU +uPP  
  SaveBmp(); \zVp8MMf  
  return FALSE; eiOAbO#U  
} 6/QWzw.0c  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ hDJ+Rk@  
 CMenu pop; Wsd_RT}ww  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ,f>^ q"  
 CMenu*pMenu=pop.GetSubMenu(0);  b%F'Ou~  
 pMenu->SetDefaultItem(ID_EXITICON); fm^tU0DY  
 CPoint pt; LVP6vs  
 GetCursorPos(&pt); tvJl-&'N  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); G|?V}pZ  
 if(id==ID_EXITICON) 'lC=k7@x  
  DeleteIcon(); F9w2+z.  
 else if(id==ID_EXIT) o}36bi{  
  OnCancel(); z 4. |N  
 return FALSE; tm34Z''.>  
} mFpj@=^_G  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); y54RD/`-  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) oM n'{+(w  
 AddIcon(); LUx'Dm"  
 return res; T}p|_)&y  
} Rp zuSh  
6EWCJ%_  
void CCaptureDlg::AddIcon() 9 [E/^  
{ WFug-#;e  
 NOTIFYICONDATA data; <6N3()A)%1  
 data.cbSize=sizeof(NOTIFYICONDATA); Q\~#cLJ/  
 CString tip; ieEt C,U  
 tip.LoadString(IDS_ICONTIP); ENYc.$ r  
 data.hIcon=GetIcon(0); w0>5#j q#r  
 data.hWnd=GetSafeHwnd(); AnsJ3C  
 strcpy(data.szTip,tip); |%Y=]@f  
 data.uCallbackMessage=IDM_SHELL; 10dK%/6/O  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; /KiaLS  
 data.uID=98; +ZwTi!W  
 Shell_NotifyIcon(NIM_ADD,&data); EA:_PBZ  
 ShowWindow(SW_HIDE); s0Y7`uD^  
 bTray=TRUE;  !vr A\d  
} W70BRXe04D  
IOrYm  
void CCaptureDlg::DeleteIcon() iee`Yg!EOH  
{ 0,LUi*10  
 NOTIFYICONDATA data; 8r.MODZG/  
 data.cbSize=sizeof(NOTIFYICONDATA); U$ZbBVa`~  
 data.hWnd=GetSafeHwnd(); @bFl8-  
 data.uID=98; F>u/Lh!  
 Shell_NotifyIcon(NIM_DELETE,&data); TTxSl p2=;  
 ShowWindow(SW_SHOW); 3z 5"Ckzb  
 SetForegroundWindow(); +I~U8v-  
 ShowWindow(SW_SHOWNORMAL); tN)Vpb\J  
 bTray=FALSE; ' #r^W2  
} HBa6Y&)<  
G)5Uiu:^X  
void CCaptureDlg::OnChange() /X\:3P  
{ e+MsFXnB8  
 RegisterHotkey(); 8/9YR(H3H  
} Yj>\WH  
toox`|  
BOOL CCaptureDlg::RegisterHotkey() Im`R2_(]  
{ ~r]$(V n  
 UpdateData(); >&qaT*_g  
 UCHAR mask=0; (n{!~'3  
 UCHAR key=0; /P{'nI  
 if(m_bControl) 0pe*DbYP5  
  mask|=4; 3t] 0  
 if(m_bAlt) s[*I210  
  mask|=2; 3V/|"R2s  
 if(m_bShift) y*sqnzgF  
  mask|=1; OdJ=4 x>  
  key=Key_Table[m_Key.GetCurSel()]; tUFXx\p  
 if(bRegistered){ "FfP&lF/  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); o, qBMo^.  
  bRegistered=FALSE; j62oA$z  
 } ~qW"v^<  
 cMask=mask; MB5X$5it  
 cKey=key; Of$gs-  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); wMiRN2\^  
 return bRegistered; >3ASrM+>w  
} |VX0o2  
H`U>ZJ.  
  四、小结 6FI`0j=~  
/%^^hr  
  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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