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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: n&7@@@cA  
  ]7<m1Lg  
  一、实现方法 [t}):}~F|  
2]Fu 1  
  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: 6Kht:WE  
O]_={%   
#pragma data_seg("shareddata") =YoTyq\  
HHOOK hHook =NULL; //钩子句柄 sMJ#<w}Q  
UINT nHookCount =0; //挂接的程序数目 g\J)= ,ju,  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 )+B=z}:Nfz  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 GMb!Q0I8  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey W:B}u\)C  
static int KeyCount =0; = o+7xom  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 @^HwrwRA  
#pragma data_seg() }:^XX0:FK  
KZ\dB;W< |  
  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。 6aSM*S)  
jEE_D +K  
  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: Q!) z)-hI  
bw;iz ,Z  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 1}DerX6  
cKey,UCHAR cMask) :|($,3*  
{ c,AZ/t  
 BOOL bAdded=FALSE; /'`6 ; uRN  
 for(int index=0;index<MAX_KEY;index++){ 7jR7  
  if(hCallWnd[index]==0){ rG5i-'  
   hCallWnd[index]=hWnd; Ys+N,:#R  
   HotKey[index]=cKey; ;qG1r@o  
   HotKeyMask[index]=cMask; V<W02\Hs  
   bAdded=TRUE; [J:zE&aj  
   KeyCount++; ahoh9iJ  
   break; cUV TRWV  
  } }wG|%Y#+r  
 } "S|(4BUJ(  
 return bAdded; ~FNPD'`t  
} ]TfeBX6ST  
//删除热键 ;>/ipnx  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) /MqP[*L  
{ w*2^/zh  
 BOOL bRemoved=FALSE; $l43>e{E  
 for(int index=0;index<MAX_KEY;index++){ v['AB4  
  if(hCallWnd[index]==hWnd){ 1l~.R#WG&  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ PIpWa$b  
    hCallWnd[index]=NULL; rJp?d9B  
    HotKey[index]=0; 0O^r.&{j>  
    HotKeyMask[index]=0; ]nHe$x!2]  
    bRemoved=TRUE; e mC\i  
    KeyCount--; /J8o_EV  
    break; q4zSS #]A  
   } M3PVixli3  
  } Ol_/uy1r[  
 } !yk7HaP  
 return bRemoved; X`tOO  
} sFD!7 ;  
5bF5~D(E  
y#nSk% "t"  
  DLL中的钩子函数如下: ew/KZE  
@u<0_r t  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) l#|J rU!  
{ 'H FwP\HX  
 BOOL bProcessed=FALSE; Hc"N& %X[  
 if(HC_ACTION==nCode) JH-nvv  
 { I}1fEw>8  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ?Ip$;s  
   switch(wParam) 0rGj|@+;  
   {  "&| lO|  
    case VK_MENU: *SXSF95  
     MaskBits&=~ALTBIT; e$x4Ux7*"  
     break; 0yKwH\S  
    case VK_CONTROL: fg< ( bXC  
     MaskBits&=~CTRLBIT; +-'`Q Ae  
     break; |zg=+  
    case VK_SHIFT: *di&%&f  
     MaskBits&=~SHIFTBIT; .;cxhgU  
     break; e|35|I '  
    default: //judge the key and send message \}n !yYh(  
     break; {W]bU{%.  
   } v5P*<U Ax  
   for(int index=0;index<MAX_KEY;index++){ /1H9z`qV  
    if(hCallWnd[index]==NULL) rn[$x(G  
     continue; ,WzG.3^m  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `s#sE.=o  
    { ]9dx3<2_I  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); t4C<#nfo  
     bProcessed=TRUE; <[esA9.]t  
    } G!-7ic_4  
   } Hs.6;|0%  
  } r=xTs,xx  
  else if((lParam&0xc000ffff)==1){ //有键按下 ZKZl>dDuh  
   switch(wParam) Bi$ 0{V Z8  
   { HIQ]"Hl  
    case VK_MENU: Dg1kbO=2  
     MaskBits|=ALTBIT; :Xh_$4~^Y  
     break; SxnIX/]J  
    case VK_CONTROL: #IH<HL)t%e  
     MaskBits|=CTRLBIT; qZ `nZi  
     break; YLD-SS[/>  
    case VK_SHIFT: 6yy|V~5  
     MaskBits|=SHIFTBIT; <=#lRZW[z  
     break; )R8%wk?2  
    default: //judge the key and send message Omp i~  
     break; "m wl-=  
   } >SY 2LmV'a  
   for(int index=0;index<MAX_KEY;index++){ hwEZj`9  
    if(hCallWnd[index]==NULL) 1kbT@  
     continue; f%`*ba" v  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \Ac}R'  
    { &Bj,.dD/a  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); TXZ(mj?  
     bProcessed=TRUE; `%KpTh  
    } 0\8*S3,q  
   } Mb2:'u [  
  } |) x'  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 4Z<]4:o  
   for(int index=0;index<MAX_KEY;index++){ Kx(76_XD  
    if(hCallWnd[index]==NULL) tn(?nQN3  
     continue; D|u^8\'.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) '-$))AdD  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); V[BY/<z)A  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 GlXA-p<  
   } x*5 Ch~<k  
  } D!l [3  
 } wrZ7Sr!/V  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); e|2vb GQ  
} yEMX`  
U-wq- GT  
  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: M63s(f  
7.w *+Z>z  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); *u:;:W&5y  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ;:#?~%7>  
oi33{#%t  
  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: ^&f{beU9  
Nb|3?c_  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) =DeHxPv}f  
{ SH@  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)  ?.4yg(  
 { Fi,e}j=2f  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 XhHel|!g:  
  SaveBmp(); Ba"^K d`  
  return FALSE; {ar5c&<  
 } 'xLM>6[wz  
 …… //其它处理及默认处理 ,v$2'm)V  
} ~#HH;q_7m  
GFASF,+  
X+?Il)Bv  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 CS^ oiV%{s  
t1.zWe+C>3  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 !q7;{/QM6  
w~cq% %  
  二、编程步骤 &;r'{$  
Cg]3(3   
  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"; m<X#W W)N  
\Y>#^b?  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; "/ a*[_sV  
L V[66<T  
  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; 4U LJtM3  
?9wFV/  
  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; ! 4qps$p{  
p[af[!  
  5、 添加代码,编译运行程序。 :>AW@SoTp  
qb>|n1F_  
三、程序代码 rE bx%u7Q  
h;4y=UU  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL P!)7\.7  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) R"9oMaY  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ M[`w{A  
#if _MSC_VER > 1000 \ pe[V~F  
#pragma once Tv*1q.MB  
#endif // _MSC_VER > 1000 &2P:A  
#ifndef __AFXWIN_H__ k@cZ"jYA  
#error include 'stdafx.h' before including this file for PCH yP<:iCY  
#endif G>_42Rp  
#include "resource.h" // main symbols (d5vH)+ A  
class CHookApp : public CWinApp N>cp>&jV  
{ oneSgJ  
 public: X d19GP!  
  CHookApp(); [pRVZV  
  // Overrides v ,G-k2$Qe  
  // ClassWizard generated virtual function overrides 8vX*SrM  
  //{{AFX_VIRTUAL(CHookApp) OxmlzQ"vM  
 public: N$ qNe'b  
  virtual BOOL InitInstance(); T ?<'=  
  virtual int ExitInstance(); w>9H"Q[  
  //}}AFX_VIRTUAL Hd=D#u=A4{  
  //{{AFX_MSG(CHookApp)  OGE#wG"S  
  // NOTE - the ClassWizard will add and remove member functions here. t`Y1.]@U  
  // DO NOT EDIT what you see in these blocks of generated code ! Lv,ji_  
  //}}AFX_MSG H(5ui`'s  
  DECLARE_MESSAGE_MAP() ~q#[5l(r8  
}; w ufKb.4`  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); i$ fjr[$B  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1S)0 23N  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Fb\2df{@  
BOOL InitHotkey(); 9m#H24{V'  
BOOL UnInit(); 9 +N._u  
#endif =JySY@?9  
/RXk[m-  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. om*tdG  
#include "stdafx.h" $Kw"5cm  
#include "hook.h" %DND&0`  
#include <windowsx.h> 2'O!~8U  
#ifdef _DEBUG yaYIgG  
#define new DEBUG_NEW 6%tiB?  
#undef THIS_FILE oRvm*"8B  
static char THIS_FILE[] = __FILE__; n/-p;#R  
#endif  2U+z~  
#define MAX_KEY 100 :+gCO!9Y  
#define CTRLBIT 0x04 q*<J $PI  
#define ALTBIT 0x02 MSYLkQ}_b  
#define SHIFTBIT 0x01 eqUn8<<s  
#pragma data_seg("shareddata") 0-&s J  
HHOOK hHook =NULL; 5Ky9Pz  
UINT nHookCount =0; e G*s1uQl  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey EDa08+Y  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT U7f&N  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey NkjQyMF  
static int KeyCount =0; No92Y^~/  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift OL mBh3&  
#pragma data_seg() ;hfG$ {l;  
HINSTANCE hins; |+4E 8;4_  
void VerifyWindow(); 31o7R &v  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) [}xIg8  
//{{AFX_MSG_MAP(CHookApp) 9>$%F;JP44  
// NOTE - the ClassWizard will add and remove mapping macros here. |qudJucV  
// DO NOT EDIT what you see in these blocks of generated code! w4< u@L  
//}}AFX_MSG_MAP qdkTg:QJ,  
END_MESSAGE_MAP() M;Mdz[Q  
Bc9|rlV,  
CHookApp::CHookApp() sJYKt   
{ 0or6_ y6  
 // TODO: add construction code here,  h?pGw1Q  
 // Place all significant initialization in InitInstance 2sd=G'7!  
} b09#+CH?  
|\r\i&|g1  
CHookApp theApp; r^o}Y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 6Nd_YX  
{ Kjca>/id  
 BOOL bProcessed=FALSE; in;+d~?  
 if(HC_ACTION==nCode) `v/tf|v 6  
 { eQ)ioY  
  if((lParam&0xc0000000)==0xc0000000){// Key up [9W&1zY  
   switch(wParam) "*>QxA%c4  
   { GF.g'wYc)Y  
    case VK_MENU: ;xkf ?|  
     MaskBits&=~ALTBIT; YWBP'Mo  
     break; BKP!+V/  
    case VK_CONTROL: px(1Ppb9  
     MaskBits&=~CTRLBIT; |#k hwH  
     break; )mo|.L0  
    case VK_SHIFT: $GfxMt  
     MaskBits&=~SHIFTBIT; B& f~.UH  
     break; zKAyfn.A  
    default: //judge the key and send message =B{$U~}  
     break; DrCfC[A~]  
   } nrD=[kc!w  
   for(int index=0;index<MAX_KEY;index++){ jQwg)E+o;  
    if(hCallWnd[index]==NULL) CPCB!8-5  
     continue; ^&w'`-ra  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &B5 Rzz-'  
    { $}h_EI6hS  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); qpEC!~ y  
     bProcessed=TRUE; MvjwP?J]  
    } r'JK$9  
   } >,Swk3  
  } T.Y4L  
  else if((lParam&0xc000ffff)==1){ //Key down TX5/{cHd  
   switch(wParam) zm^p7&ak$  
   { N@`9 ~JS  
    case VK_MENU: v_ F?x!  
     MaskBits|=ALTBIT; FVLA^$5c  
     break; x?k |i}Q  
    case VK_CONTROL: bA9dbe  
     MaskBits|=CTRLBIT; w!Lb;4x ?  
     break; nOoh2jUM  
    case VK_SHIFT: E=U^T/  
     MaskBits|=SHIFTBIT; ^~k FC/tQ  
     break; "@<g'T0  
    default: //judge the key and send message /)<7$  
     break; 0BwQ!B.  
   } BO cEL%+  
   for(int index=0;index<MAX_KEY;index++) D `3yv R  
   { R8Ei:f}  
    if(hCallWnd[index]==NULL) ;og<eK  
     continue; K>p:?w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 7^}Z%c  
    { ea;c\84_N  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Tf]VcEF  
     bProcessed=TRUE; I)4|?tb ?  
    } z&G3&?Z  
   } v?'k)B  
  } |8?{JKsg  
  if(!bProcessed){ ,T>2zSk  
   for(int index=0;index<MAX_KEY;index++){ (HgdmN%  
    if(hCallWnd[index]==NULL) w5G34[v  
     continue; ]tV{#iIJ*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) *xNjhR]7v  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); HDG"a&$   
   } FQ&VM6_  
  } SxQDqoA~  
 } ;@\J scNJ|  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); n7<-lQRaxZ  
} Xpz-@fqKdf  
.TU15AAc  
BOOL InitHotkey() @?NLME  
{ !LSWg:Ev+  
 if(hHook!=NULL){ #z5?Y2t7~^  
  nHookCount++; _5 -"<  
  return TRUE; e/~<\  
 } wA+4:CF @  
 else yq^$H^_O p  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);  ^*>no=A  
  if(hHook!=NULL) [9Hm][|Ph  
   nHookCount++; fH{$LjH(  
  return (hHook!=NULL); xo3)ds X  
} VH*(>^Of F  
BOOL UnInit() 5 `mVe0uI  
{ i; uM!d}  
 if(nHookCount>1){ T[K?A+l  
  nHookCount--; q:eAL'OkM  
  return TRUE; lcLxqnv  
 } \shoLp   
 BOOL unhooked = UnhookWindowsHookEx(hHook); 5%$kAJZC-  
 if(unhooked==TRUE){ <t2?Oii;  
  nHookCount=0; Hd}t=6  
  hHook=NULL; ^8t*WphZC  
 } vx,6::%]  
 return unhooked; @y%qQe/g  
} Gs?sO?j  
uB9+E%jOdQ  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) G!Q)?N    
{ {i?K~| h  
 BOOL bAdded=FALSE; x?$Y<=vT  
 for(int index=0;index<MAX_KEY;index++){ #rC+13  
  if(hCallWnd[index]==0){ P=i |{vv(  
   hCallWnd[index]=hWnd; :~(^b;yhZ  
   HotKey[index]=cKey; ZACn_gd[5  
   HotKeyMask[index]=cMask; K1yM'6 Zw  
   bAdded=TRUE; 6!V* :.(  
   KeyCount++; jF0BWPL  
   break; -Euy5Y  
  } uATRZMai  
 } UzRF'<TWf  
 return bAdded; S!c@6&XJm?  
} @ uWD>(D  
U;Wmx  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Kn]WXc|("  
{ hj[g2S%X  
 BOOL bRemoved=FALSE; }e6:&`a xD  
 for(int index=0;index<MAX_KEY;index++){ 3@A k6Uh  
  if(hCallWnd[index]==hWnd){ s;)tLJ!  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ;<Q_4 V  
    hCallWnd[index]=NULL; @J)vuGS  
    HotKey[index]=0; &0blHDMj{#  
    HotKeyMask[index]=0; (6aZQ`H  
    bRemoved=TRUE; :"^$7  
    KeyCount--;  HuC lO  
    break; |1x,_uyQ%  
   } @TT[H*,  
  } Gj0NN:  
 } 1 1'Tt!  
 return bRemoved;  6<GWDO  
} a_x6 v*  
9dv~WtH>5  
void VerifyWindow() s!\L1E  
{ M>#S z  
 for(int i=0;i<MAX_KEY;i++){ L*38T\  
  if(hCallWnd!=NULL){ )HHzvGsL)  
   if(!IsWindow(hCallWnd)){ S]{Z_|h*j  
    hCallWnd=NULL; :@L5=2Z+  
    HotKey=0; [O'p&j@  
    HotKeyMask=0; ]].21  
    KeyCount--; O2B$c\pw  
   } r3)t5P*_  
  } %dQX d ]  
 } w,$17+]3  
} @ vudeaup  
[Hf FC3U  
BOOL CHookApp::InitInstance() YEj U3^@  
{ LdL\B0^l  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); djp(s$:{4  
 hins=AfxGetInstanceHandle(); V19*~v=u  
 InitHotkey(); cke[SUH,  
 return CWinApp::InitInstance(); woKdI)f $  
} Sy55w={  
:-8u*5QK]`  
int CHookApp::ExitInstance() mUw,q;{  
{ iE5^Xik ,  
 VerifyWindow(); `VbG%y&I  
 UnInit(); c`Cn9bX  
 return CWinApp::ExitInstance(); `z.#O\@o  
} _XtY/7n  
<k1gc,*  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 4 n( f/  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) W525:h52{  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ pQi -  
#if _MSC_VER > 1000 ZG|T-r;~  
#pragma once c9'b `#'  
#endif // _MSC_VER > 1000 Ws@s(5r  
9p<l}h7g  
class CCaptureDlg : public CDialog fE iEy%o  
{ Z5K,y19/~  
 // Construction P{ o/F  
 public: +aap/sYp  
  BOOL bTray; 5kz`_\ &  
  BOOL bRegistered; 4RNzh``u  
  BOOL RegisterHotkey(); ^S @b*  
  UCHAR cKey; |Ca n  
  UCHAR cMask; <o O_wS@:  
  void DeleteIcon(); o=}?aC3I  
  void AddIcon(); O!jCQ{ T  
  UINT nCount; M9nYt~vHX  
  void SaveBmp(); o^_am>h  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor jLg4_N1SD  
  // Dialog Data i|e-N?l  
  //{{AFX_DATA(CCaptureDlg) g=wnly  
  enum { IDD = IDD_CAPTURE_DIALOG };  LvaF4Y2v  
  CComboBox m_Key; +X%yF{^m(  
  BOOL m_bControl; 2vLn#  
  BOOL m_bAlt; #kA+Yqy \)  
  BOOL m_bShift; &M0v/!%L  
  CString m_Path; ]MyWB<9M  
  CString m_Number; [o6d]i!  
  //}}AFX_DATA ~}fpe>M:  
  // ClassWizard generated virtual function overrides |{(ynZ]R  
  //{{AFX_VIRTUAL(CCaptureDlg) z\, w$Ef+  
 public: (J;<&v}Gad  
  virtual BOOL PreTranslateMessage(MSG* pMsg); :1Ay_ b_J  
 protected: 4T" P #)z  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support *(J<~:V?  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ;S/fe(C   
  //}}AFX_VIRTUAL .W\Fa2}%av  
  // Implementation Om*Dy}  
 protected: E*zk?G|  
  HICON m_hIcon; +9t@eHJT1  
  // Generated message map functions fsu'W]f  
  //{{AFX_MSG(CCaptureDlg) ]v#Q\Q8>  
  virtual BOOL OnInitDialog(); uzOZxW[e  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); tfO _b5g  
  afx_msg void OnPaint(); 9ZwhC s O  
  afx_msg HCURSOR OnQueryDragIcon(); Ru/3>n  
  virtual void OnCancel(); [&$z[/4:8c  
  afx_msg void OnAbout(); Y|",.~  
  afx_msg void OnBrowse(); YGB|6p(  
  afx_msg void OnChange(); %O-wMl  
 //}}AFX_MSG G7u7x?E:B`  
 DECLARE_MESSAGE_MAP() 0X;Dr-3<  
}; xM(  
#endif !Qy3fs  
| =&r) ~  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file pdM|dGq^  
#include "stdafx.h" |"arVde  
#include "Capture.h" (Xx @_  
#include "CaptureDlg.h" NW$Z}?I  
#include <windowsx.h> mYZH]oo  
#pragma comment(lib,"hook.lib") U<t Qj`  
#ifdef _DEBUG 0>vm&W<?)  
#define new DEBUG_NEW ke0Vy(3t{h  
#undef THIS_FILE k~R_Pq S  
static char THIS_FILE[] = __FILE__; JP#m} W  
#endif -<.>jX  
#define IDM_SHELL WM_USER+1 IaW8  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ?AR6+`0  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 4&tY5m>  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; )<+Z,6  
class CAboutDlg : public CDialog X@B+{IFC  
{ &}WSfZ0{  
 public: gxF3gM  
  CAboutDlg(); vg<_U&N=-r  
  // Dialog Data qzq>C"z\Y$  
  //{{AFX_DATA(CAboutDlg)  u >x2  
  enum { IDD = IDD_ABOUTBOX }; R]dc(D  
  //}}AFX_DATA U7O2.y+  
  // ClassWizard generated virtual function overrides A\:M}D-(  
  //{{AFX_VIRTUAL(CAboutDlg) LGK}oL'  
 protected: xZ .:H&0G  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support zk?lNs  
  //}}AFX_VIRTUAL sD M!Uv2n  
  // Implementation ;kdJxxUox  
 protected: b8O:@j2  
  //{{AFX_MSG(CAboutDlg) JAYom%A"  
  //}}AFX_MSG wI)W:mUZZ  
  DECLARE_MESSAGE_MAP() ]RV6( |U4_  
}; 3=` UX  
K}6}Opr,Tt  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) >t.I,Zn  
{ x\)-4w<P  
 //{{AFX_DATA_INIT(CAboutDlg) P )`-cfg  
 //}}AFX_DATA_INIT qRNGe8  
} <w[)T`4N  
k(et b#  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) *M&~R(TMn  
{ XBBsdldZ  
 CDialog::DoDataExchange(pDX); } pA0mW9  
 //{{AFX_DATA_MAP(CAboutDlg) 778a)ZOzb  
 //}}AFX_DATA_MAP |3s-BKbN4  
} NVP~`sxiZ  
07n=H~yU  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) |= ~9y"F  
 //{{AFX_MSG_MAP(CAboutDlg) 9n1O@~  
 // No message handlers V<1dA\I"  
 //}}AFX_MSG_MAP V;.=O}Lr  
END_MESSAGE_MAP() /6g*WX2P1  
o;}o"-s  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) oA`Ncu5  
: CDialog(CCaptureDlg::IDD, pParent) pj'Yv  
{ ="MG>4j3.F  
 //{{AFX_DATA_INIT(CCaptureDlg) [<6ez;2q'  
  m_bControl = FALSE; ~Xa >;  
  m_bAlt = FALSE; " @.hz@>  
  m_bShift = FALSE; Yf|+p65g  
  m_Path = _T("c:\\"); iX}EJD{f  
  m_Number = _T("0 picture captured."); Nq-qks.&  
  nCount=0; >[NNu Y~  
  bRegistered=FALSE; ZM0vB% M|  
  bTray=FALSE; "H6DiPh.E  
 //}}AFX_DATA_INIT .F |yxj;I7  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 @N34 Q-l  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ho 4~-xmN  
} . F_pP2A  
0D=6-P?^W  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) F@[l&`7  
{ [Qr#JJ  
 CDialog::DoDataExchange(pDX); G3m+E;o1  
 //{{AFX_DATA_MAP(CCaptureDlg) zGA#7W2?0  
  DDX_Control(pDX, IDC_KEY, m_Key); Ak&eGd$d  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); h ~v8Q_6  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 90 (JP-  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); `N;JM3 ck  
  DDX_Text(pDX, IDC_PATH, m_Path); 1InG%=jLo  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Ea 0 j}  
 //}}AFX_DATA_MAP 1ih|b8)Dn  
} 7iT#dpF/A  
RWK|?FD\<  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog)  9/`T]s"  
//{{AFX_MSG_MAP(CCaptureDlg) W A-\2  
 ON_WM_SYSCOMMAND() 'jqkDPn  
 ON_WM_PAINT() 6ID@0  
 ON_WM_QUERYDRAGICON() Sw%^&*J  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) !np-Jmi  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) L~=h?C<  
 ON_BN_CLICKED(ID_CHANGE, OnChange) c#Y/?F2p  
//}}AFX_MSG_MAP -6@#Nq_iWU  
END_MESSAGE_MAP() \'x. DVp  
;X*I,g.+H  
BOOL CCaptureDlg::OnInitDialog() m?0caLw<  
{ vjmNS=l  
 CDialog::OnInitDialog(); TZ3"u@ 06  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); "]B:QeMeF!  
 ASSERT(IDM_ABOUTBOX < 0xF000); f }P6P>0T  
 CMenu* pSysMenu = GetSystemMenu(FALSE); PVLLuv  
 if (pSysMenu != NULL) 67?O}~jbG  
 { 8k vG<&D  
  CString strAboutMenu; lXjhT  
  strAboutMenu.LoadString(IDS_ABOUTBOX); v*U OD'tk  
  if (!strAboutMenu.IsEmpty()) A63=$  
  { ,Y  ./9F  
   pSysMenu->AppendMenu(MF_SEPARATOR); [2ez"4e  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Ia %> c  
  } "w7wd5h  
 } C/_Z9LL?F  
 SetIcon(m_hIcon, TRUE); // Set big icon QZw`+KR  
 SetIcon(m_hIcon, FALSE); // Set small icon rv ouE:  
 m_Key.SetCurSel(0); +XMKRt  
 RegisterHotkey(); b"k1N9  
 CMenu* pMenu=GetSystemMenu(FALSE); 4c0 =\v  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); P-U9FKrt  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Xw)W6H|  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); C;>!SRCp  
 return TRUE; // return TRUE unless you set the focus to a control Z4KYVHD,  
} =^3 Z L  
OiI29  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Ku$:.  
{ LYhjI  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 'ioX,KD  
 { | $  
  CAboutDlg dlgAbout; V(wm?Cc]  
  dlgAbout.DoModal(); /fgy07T  
 } rU/8R'S  
 else :< X&y  
 { w]1Ltq*g/  
  CDialog::OnSysCommand(nID, lParam); S+2we  
 } Cs9o_Z~  
} C( wZj O?N  
t.X8c/,;g  
void CCaptureDlg::OnPaint() >= O5=\`  
{ &65I 6  
 if (IsIconic()) 1{1 5#W  
 { "d"6.ND  
  CPaintDC dc(this); // device context for painting cb82k[L6  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ?vh1 >1D  
  // Center icon in client rectangle %^pm~ck!  
  int cxIcon = GetSystemMetrics(SM_CXICON);  |pgrR7G'  
  int cyIcon = GetSystemMetrics(SM_CYICON); vX30Ijm  
  CRect rect; l\t g.O~  
  GetClientRect(&rect); *E.uqu>I  
  int x = (rect.Width() - cxIcon + 1) / 2; b@X+vW{S  
  int y = (rect.Height() - cyIcon + 1) / 2; ?hBjq  
  // Draw the icon erlg\-H   
  dc.DrawIcon(x, y, m_hIcon); YUjKOPN  
 } yd|ao\'=  
 else yi.GD~69  
 { SR>(GQ,m0;  
  CDialog::OnPaint(); Ky[s& >02  
 } N||a0&&  
} lq}m0}9<  
sU7fVke1   
HCURSOR CCaptureDlg::OnQueryDragIcon() s'B$/qCkR  
{ me@k~!e"z  
 return (HCURSOR) m_hIcon; ?'I-_9u  
} BK]5g[   
FQ_a= v  
void CCaptureDlg::OnCancel() <P@ "VwUX  
{ Kt3T~k  
 if(bTray) tZ>'tE   
  DeleteIcon(); {c}n."`  
  CDialog::OnCancel(); H"NBjVRU%  
} JCjV,  
M.qE$  
void CCaptureDlg::OnAbout() ?+_Y!*J2b  
{ SDu%rr7sQ  
 CAboutDlg dlg; pN=>q <]L  
 dlg.DoModal(); lK Ry4~O  
} VPvQ]}g6k  
0JE*|CtK  
void CCaptureDlg::OnBrowse() ec h1{v\B|  
{ U{ 52bH<  
 CString str; AB+HyZ*//  
 BROWSEINFO bi; \ lW*.<  
 char name[MAX_PATH]; T-F8[dd^/  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); :d1Kq _\K  
 bi.hwndOwner=GetSafeHwnd(); lk4U/:  
 bi.pszDisplayName=name; ^]k=*>{ R  
 bi.lpszTitle="Select folder"; VXPs YR&  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Ju-#F@38  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); D4jZh+_|S  
 if(idl==NULL) lw`$(,  
  return; m^$KDrkD  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); K |^OnM  
 str.ReleaseBuffer(); p'4ZcCW?f  
 m_Path=str; |-9##0H  
 if(str.GetAt(str.GetLength()-1)!='\\') 9}T(m(WQVu  
  m_Path+="\\"; }xJ!0<Bs  
 UpdateData(FALSE); @{@DGc  
} ~Dbu;cqR@  
RPw1i*  
void CCaptureDlg::SaveBmp() ("s!t?!&YS  
{ h'B0rVQia>  
 CDC dc; V~7Oa2'#B  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); wBCBZs$H  
 CBitmap bm; ^tL]QE?|  
 int Width=GetSystemMetrics(SM_CXSCREEN); MjW{JR)I  
 int Height=GetSystemMetrics(SM_CYSCREEN); 0`4Fa^o]h  
 bm.CreateCompatibleBitmap(&dc,Width,Height); =zW`+++3  
 CDC tdc; @NYlVk2  
 tdc.CreateCompatibleDC(&dc); .h-k*F0Ga)  
 CBitmap*pOld=tdc.SelectObject(&bm); g oZw![4l  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); x-T7 tr&(  
 tdc.SelectObject(pOld); 04c`7[  
 BITMAP btm; TBmmC}PEd  
 bm.GetBitmap(&btm); F%I*m^7d  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; N)EJP ~0  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); +{\b&q_  
 BITMAPINFOHEADER bih; PTpGZ2FZ  
 bih.biBitCount=btm.bmBitsPixel; PNpH)'C|  
 bih.biClrImportant=0; {# N,&?[  
 bih.biClrUsed=0; H<Zs2DP`  
 bih.biCompression=0; N&G; `  
 bih.biHeight=btm.bmHeight; 'XI-x[w  
 bih.biPlanes=1; 7I0K= 'D7  
 bih.biSize=sizeof(BITMAPINFOHEADER); &;[0.:;  
 bih.biSizeImage=size; ob K6GG?ZE  
 bih.biWidth=btm.bmWidth; W]5sqtF;6  
 bih.biXPelsPerMeter=0; NKYHJf2?x  
 bih.biYPelsPerMeter=0; F\%PB p  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); :+<GJj_d+  
 static int filecount=0; ,-V7~gM%}  
 CString name; k&= iye(  
 name.Format("pict%04d.bmp",filecount++); es1'z.UJ  
 name=m_Path+name; -+n? Q;  
 BITMAPFILEHEADER bfh; 7#sb },J{  
 bfh.bfReserved1=bfh.bfReserved2=0; ^ux"<?  
 bfh.bfType=((WORD)('M'<< 8)|'B'); OSkBBo]~z  
 bfh.bfSize=54+size; gmCB4MO  
 bfh.bfOffBits=54; V4. }wz_Y  
 CFile bf; \eCQL(_  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Wdp4'rB  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ]4[^S.T=  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); #{~3bgY  
  bf.WriteHuge(lpData,size); gcF V$  
  bf.Close(); ;m}o$`  
  nCount++; Lu[xoQ~I  
 } lj %k/u  
 GlobalFreePtr(lpData); ?mh0^G  
 if(nCount==1) M5{vYk>,1Q  
  m_Number.Format("%d picture captured.",nCount); SXRND;-W8  
 else wV"C ,*V  
  m_Number.Format("%d pictures captured.",nCount); d=a$Gd_$  
  UpdateData(FALSE); +pjU4>)  
} -O6\!Wo=-  
aFDCVm%U|  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) h5ZxxtGU  
{ ^ oh%Ns  
 if(pMsg -> message == WM_KEYDOWN) u4~( 0  
 { S %(R9N|  
  if(pMsg -> wParam == VK_ESCAPE) <xAlp;8m5  
   return TRUE; trg&^{D<  
  if(pMsg -> wParam == VK_RETURN) CW@G(R  
   return TRUE; &\Yd)#B/  
 } 8Og)(BC  
 return CDialog::PreTranslateMessage(pMsg); 7WN$ rl5/  
} EK}QjY[i  
D,SL_*r{  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ?sbM=oo  
{ KDYyLkI dr  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ C72btS  
  SaveBmp(); C/!8NV1:4  
  return FALSE; B:tGD@  
} Ts 3(,Y  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ qR8 BS4q_p  
 CMenu pop; 33w(Pw  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); eo'C)j# U  
 CMenu*pMenu=pop.GetSubMenu(0); b* o,re)Dj  
 pMenu->SetDefaultItem(ID_EXITICON); jAOD&@z1  
 CPoint pt; 1~9AQ[]w8  
 GetCursorPos(&pt); ;aUI3n%  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); mG+hLRTXP  
 if(id==ID_EXITICON) l&m'?. g f  
  DeleteIcon(); `*Jw[Bnh8  
 else if(id==ID_EXIT) WyJXT.  
  OnCancel(); ppPzI,  
 return FALSE; )4bZ;'B5  
} {#%;HqP  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); et :v4^*f  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 6T=zHFf~  
 AddIcon(); ai~JY[  
 return res; !GBGC|avE  
} b6gD*w <  
Mta;6<  
void CCaptureDlg::AddIcon() ]@7]mu:oL  
{  eZ +uW0  
 NOTIFYICONDATA data; K7 $Vl"l  
 data.cbSize=sizeof(NOTIFYICONDATA); b}jLI_R{  
 CString tip;  P7 p'j  
 tip.LoadString(IDS_ICONTIP); Nx"v|"  
 data.hIcon=GetIcon(0); e3{L%rQE  
 data.hWnd=GetSafeHwnd(); _Rnq5y  
 strcpy(data.szTip,tip); 4r>buEU  
 data.uCallbackMessage=IDM_SHELL; ?u8 vK<2h  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 1Qgd^o:d  
 data.uID=98; 0-w^y<\  
 Shell_NotifyIcon(NIM_ADD,&data); ^Sz?c_<2P  
 ShowWindow(SW_HIDE); d 3 }'J  
 bTray=TRUE; od~`q4p1(-  
} js8\"  
7<c&)No;  
void CCaptureDlg::DeleteIcon() S~4HFNe^&  
{ i*%2 e)  
 NOTIFYICONDATA data; }V % b  
 data.cbSize=sizeof(NOTIFYICONDATA); \^%5!  
 data.hWnd=GetSafeHwnd(); Y/w) VV  
 data.uID=98; 9 ulr6  
 Shell_NotifyIcon(NIM_DELETE,&data); fO{E65uA  
 ShowWindow(SW_SHOW); [/I1%6;  
 SetForegroundWindow(); vH^^QI:em  
 ShowWindow(SW_SHOWNORMAL); `)R@\@jt  
 bTray=FALSE; JTg0T+  
} 1eDc:!^SD  
q7% eLJ  
void CCaptureDlg::OnChange() 5CuK\<  
{ uH-*`*  
 RegisterHotkey(); t#h<'?\E  
} $MG. I[h  
`;R|SyrX  
BOOL CCaptureDlg::RegisterHotkey() -/ #tQ~{gs  
{ <ArP_! `3  
 UpdateData(); kVZ5>D$  
 UCHAR mask=0; ywV8s|o  
 UCHAR key=0; WtTwY8HC  
 if(m_bControl) P'6(HT>F?  
  mask|=4; !S',V&Yb  
 if(m_bAlt) #UH7z 4u  
  mask|=2; `N"fsEma  
 if(m_bShift)  <XxFR  
  mask|=1; ;{inhiySN  
  key=Key_Table[m_Key.GetCurSel()]; <~Tlx:  
 if(bRegistered){ i>[1^~;  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); jsvD[\P  
  bRegistered=FALSE; VNbq]L(g  
 } Lay+)S.ta[  
 cMask=mask; Az2$\  
 cKey=key; < &'r_m  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); R`:NUGR  
 return bRegistered; ^50/.Z >  
} ;pNHT*>u,  
$|YIr7?R  
  四、小结 c#e_Fs  
8EPV\M1%  
  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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