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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: %YR&>j k  
  -EiTP:A  
  一、实现方法 Dj\nsc@e3  
_WEJ,0* #'  
  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: =.3#l@E!C  
#~ x7G  
#pragma data_seg("shareddata") `p()ko  
HHOOK hHook =NULL; //钩子句柄 c1Ks{%iA  
UINT nHookCount =0; //挂接的程序数目 >$D!mraih  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 /yI4;:/  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 A6]:BuP;c  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey jqaX|)8|$  
static int KeyCount =0; m'"r<]pB*4  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Skt-5S#  
#pragma data_seg() wMVUTm  
$?56 i4  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 n4{%M  
+9Tc.3vQ  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: =dGp&9K,fw  
pCE GZV,d@  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR B7f<XBU6>  
cKey,UCHAR cMask) O)q4^AE$  
{ Jpapl%7v  
 BOOL bAdded=FALSE; (h0@;@@7hW  
 for(int index=0;index<MAX_KEY;index++){ a`' >VCg  
  if(hCallWnd[index]==0){ ozRO:*51  
   hCallWnd[index]=hWnd; +YvF+E  
   HotKey[index]=cKey; h*fN]k6  
   HotKeyMask[index]=cMask; =ANr|d  
   bAdded=TRUE; F!X0Wo=  
   KeyCount++; =o 9s?vOJ  
   break; s;vt2>;q+e  
  } =Kkqk  
 } AX v q~XE  
 return bAdded; jSp&\Wjb  
} Qf~>5(,h  
//删除热键 V}s/knd  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) _.JQ h   
{ :BPgDLL,  
 BOOL bRemoved=FALSE; kPX+n+$  
 for(int index=0;index<MAX_KEY;index++){ a&%aads  
  if(hCallWnd[index]==hWnd){ `H! (hMMV  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ?, pwYT0g  
    hCallWnd[index]=NULL; q=X<QhK  
    HotKey[index]=0; "KIY+7@S}  
    HotKeyMask[index]=0; T1d@=&0"  
    bRemoved=TRUE; vFk@  
    KeyCount--; sBadiDG~9  
    break; Jx+6Kq(  
   } 3RtVFDIZA"  
  } t<v.rb  
 } :`N&BV  
 return bRemoved; TanWCt4r  
} 5k0iVpjQ  
_m9k2[N!  
"B3jq^  
  DLL中的钩子函数如下: AY52j  
IS]A<}j/-  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) HUx`RX0>  
{ p:xyy*I  
 BOOL bProcessed=FALSE; 2PQBUq  
 if(HC_ACTION==nCode) '/I`dj  
 { ')q0VaohC  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 NZ1B#PG,c  
   switch(wParam) {bXN[=j  
   {  q1VKoKb6\:  
    case VK_MENU: T ~xVHk1  
     MaskBits&=~ALTBIT; (u 7Lh>6%  
     break; a[K&;)  
    case VK_CONTROL: L/u|90) L  
     MaskBits&=~CTRLBIT; +ay C 0  
     break; Ir JSU_  
    case VK_SHIFT: >>{):r Z  
     MaskBits&=~SHIFTBIT; J2Dn  
     break; ?^~ZsOd8B  
    default: //judge the key and send message PlB3"{}0Q  
     break; *O$|,EsY  
   } -- %XkO  
   for(int index=0;index<MAX_KEY;index++){ XCI  
    if(hCallWnd[index]==NULL) D|5mNX %e  
     continue; ] 0R*F30]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Y!M0JSaM  
    { % G!!0V!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 3 P0z$jh"H  
     bProcessed=TRUE; \ aJ>?   
    } Osqk#Oh  
   } Vo"G@W)lZ  
  } "e-Y?_S7R8  
  else if((lParam&0xc000ffff)==1){ //有键按下 `<tRfl}qs  
   switch(wParam) fn<dr(Dx  
   { JzEg`Sn^  
    case VK_MENU: 4pL'c@'  
     MaskBits|=ALTBIT; :P-H8*n""  
     break; }[eUAGhDU  
    case VK_CONTROL: 3V]dl)en%  
     MaskBits|=CTRLBIT; }Cu:BD.zQ  
     break; uf?;;wg  
    case VK_SHIFT: sK%b16#  
     MaskBits|=SHIFTBIT; __}SHU0R  
     break; r^Ra`:ca  
    default: //judge the key and send message ft/k-64  
     break; ]C^ #)7  
   } I;@q`Tm  
   for(int index=0;index<MAX_KEY;index++){ mPA)G,^  
    if(hCallWnd[index]==NULL) GSRf/::I}4  
     continue; M %,\2!$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) q;9X8 _  
    { p.:|Z-W$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); &W>\Vl1  
     bProcessed=TRUE; f hK<P_}  
    } ;SXkPs3q  
   } "7sv@I_j  
  } BQfnoF  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 )Cdw_Yx  
   for(int index=0;index<MAX_KEY;index++){ uT]$R  
    if(hCallWnd[index]==NULL) c%5P|R~g]p  
     continue; ?Q_ @@)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) q#j[0,^ $  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ?sHZeWZ(  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 J;>;K6pW  
   } q!W,2xqZoq  
  } gbMA-r:IC  
 } al#(<4sJ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ?J$k 5;  
} .J-k^+-  
1V`-D8-?  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: mZU L}[xf  
5"h4XINZ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ddL3wQ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ;X+0,K3c  
>C,0}lj  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: rZ,qHM  
tzN9d~JZ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ds*gL ~k^  
{ 1R_@C.I  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) qVU<jt  
 { O\7x+^.  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Q7u|^Gu,5  
  SaveBmp(); 6c+29@  
  return FALSE; ~0CNCP  
 } h HHR]e5:  
 …… //其它处理及默认处理 ,%Z&*/*Oh  
} :#vA5kC  
Vw ;iE=L  
< R"Y^]P=  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 "#Z e3Uy\  
:[l}Bb,  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 G!`%.tH  
zji9\  
  二、编程步骤 eLT3b6'"?  
pej-W/R&  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; T} \>8EEG  
!=30s;-  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ,w"cY?~<  
#U0| j?!D  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; T.De1 Q|  
~7aD#`amU  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; \u.5 _ g  
>? o5AdZ  
  5、 添加代码,编译运行程序。 Kez0Bka  
&K!0yR  
三、程序代码 _&(Wz0  
8r}tf3xMCM  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL #l>r9Z71  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ^XyC[ G@[  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ &7kLSb&|;  
#if _MSC_VER > 1000 bZSt<cH3  
#pragma once s j-oaWt  
#endif // _MSC_VER > 1000 =WN8> <K!  
#ifndef __AFXWIN_H__ j^/<:e c.  
#error include 'stdafx.h' before including this file for PCH >WO;q  
#endif Lm$KR!z  
#include "resource.h" // main symbols ^Zpz@T>m  
class CHookApp : public CWinApp $lB!Q8a$  
{ Mb_"M7  
 public: q: F6MW  
  CHookApp(); Bph(\= W  
  // Overrides Q~^v=ye  
  // ClassWizard generated virtual function overrides &hVf=We  
  //{{AFX_VIRTUAL(CHookApp) 7.{+8#~nV  
 public: zKk=R6w  
  virtual BOOL InitInstance(); _0[s]  
  virtual int ExitInstance(); QBmARQ  
  //}}AFX_VIRTUAL kK/>,Eg  
  //{{AFX_MSG(CHookApp) q8_E_s-U,  
  // NOTE - the ClassWizard will add and remove member functions here. p8]XNe  
  // DO NOT EDIT what you see in these blocks of generated code ! 6I~M8Lo ;  
  //}}AFX_MSG NWwKp?  
  DECLARE_MESSAGE_MAP() ^Gbcs l~Gj  
}; 9XUYy2{G  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); XwIHIG}  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %N\45nYU:  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); !*^+7M  
BOOL InitHotkey(); e}gGl<((g  
BOOL UnInit(); (CDh,ZN;|  
#endif REc90v2"  
Aa-OMo;~  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Gf7r!Ur;g  
#include "stdafx.h" 3-y2i/4}$  
#include "hook.h" 0<-A2O),  
#include <windowsx.h> |p/[sD+M  
#ifdef _DEBUG 9-# =xE9'U  
#define new DEBUG_NEW ty;a!yjC  
#undef THIS_FILE !K.)Qr9V  
static char THIS_FILE[] = __FILE__; @B)5Ho  
#endif m{*_%tjN0  
#define MAX_KEY 100 O~Jf"Ht  
#define CTRLBIT 0x04 9;gy38.3  
#define ALTBIT 0x02 d|tNn@jN  
#define SHIFTBIT 0x01 z\k 6."e_&  
#pragma data_seg("shareddata") N#OO{`":Z`  
HHOOK hHook =NULL; $W;r S7b  
UINT nHookCount =0; NHdNCHhA>-  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey  (=%0x"'  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT BN`tiPNEp  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Nc EPPl 0I  
static int KeyCount =0; }!kvoV)]1  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 7Or?$  
#pragma data_seg() GOCe&?  
HINSTANCE hins; k:U%#rb;  
void VerifyWindow(); pcQzvLk  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ;Uypv|xX  
//{{AFX_MSG_MAP(CHookApp)  fsKZ  
// NOTE - the ClassWizard will add and remove mapping macros here. ;x)f;!e+  
// DO NOT EDIT what you see in these blocks of generated code! 9D5v0Qi  
//}}AFX_MSG_MAP h^zcM_  
END_MESSAGE_MAP() d<_IC7$u>  
y7b>>|C  
CHookApp::CHookApp() ,[|i^  
{ 2j^8{Agz  
 // TODO: add construction code here, V#&S&dn  
 // Place all significant initialization in InitInstance /jc; 2  
} [ { F;4> g  
V[* <^%  
CHookApp theApp; ~c,+)69"T  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ZB$,\|^6  
{ UWgPQ%}  
 BOOL bProcessed=FALSE; d ~CZ9h  
 if(HC_ACTION==nCode) :Mu]* N  
 { ['c*<f" D2  
  if((lParam&0xc0000000)==0xc0000000){// Key up 7?Twhs.O  
   switch(wParam) GKXd"8z]  
   { od/Q"5t[p  
    case VK_MENU: UnTvot6~  
     MaskBits&=~ALTBIT; *]S&V'Di  
     break; }1Hy[4B(k\  
    case VK_CONTROL:  ~Ctq  
     MaskBits&=~CTRLBIT; I~M@v59C  
     break; F{17K$y  
    case VK_SHIFT: X5)].[d  
     MaskBits&=~SHIFTBIT; k _Bz@^J  
     break; 2reQd47  
    default: //judge the key and send message .L3D]  
     break; v00w GOpW  
   } J.,7d ,  
   for(int index=0;index<MAX_KEY;index++){ > {h/4T@  
    if(hCallWnd[index]==NULL) /a-OB U  
     continue; 3jM+j_n R  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $Ehe8,=fj  
    { dEoW8 M#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); F$,i_7Z&6  
     bProcessed=TRUE; ibuoq X`  
    } dJ,,yA*  
   } =W'{xG}  
  } y(6*)~Dh  
  else if((lParam&0xc000ffff)==1){ //Key down QL@}hw.F  
   switch(wParam) 8Vm)jnM  
   { enQev?8%  
    case VK_MENU: ?Hf8<C}3  
     MaskBits|=ALTBIT; @3Mp>u/  
     break; \BdQ(rm  
    case VK_CONTROL: /s`8=+\9  
     MaskBits|=CTRLBIT; m@` NN  
     break; oe1$;K>.7  
    case VK_SHIFT: \4hB1-  
     MaskBits|=SHIFTBIT; 'CjcFP  
     break; LeXkl=CC  
    default: //judge the key and send message Cbr>\;sc2Z  
     break; &Ht5!zuW,  
   } vy5SBiK  
   for(int index=0;index<MAX_KEY;index++) lT- LOu|  
   { !-|{B3"6  
    if(hCallWnd[index]==NULL) `yua?n  
     continue; RATW[(ZA  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8(GJz ~y  
    { 0(az80 p  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); idP2G|Z  
     bProcessed=TRUE; 5l /EZ\q  
    } vt2A/9_Z%  
   } ~&8bVA= .  
  } ":Ll. =!  
  if(!bProcessed){ kKNrCv@64d  
   for(int index=0;index<MAX_KEY;index++){ 0bI} s`sr  
    if(hCallWnd[index]==NULL) y[~w2a&+  
     continue; l%xjCuuhU  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ]n&Eb88  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); d7!,  
   } #s]`jdc  
  } {$qLMx';  
 } +m1y#|08  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); v^Pjvv=  
} MN. $a9m  
r| 0wIpi6Q  
BOOL InitHotkey() F */J`l  
{ +FlO_=Bu  
 if(hHook!=NULL){ -x0u}I  
  nHookCount++; fpPHw)dTd  
  return TRUE; NR0fxh  
 }  <sC.  
 else @xPWR=Lb  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); <lHVch"(^$  
  if(hHook!=NULL) M@78.lPS  
   nHookCount++; L[.RV*sL  
  return (hHook!=NULL); r2xIbZ  
} m\ (crkN  
BOOL UnInit() u+,  
{ z+qrsT/?L  
 if(nHookCount>1){ 1usLCG>w{  
  nHookCount--; 9/I|oh_ G  
  return TRUE; v?qU/  
 } "~ eF%}.  
 BOOL unhooked = UnhookWindowsHookEx(hHook); .7M :AS>  
 if(unhooked==TRUE){ {G4{4D }  
  nHookCount=0; yM*f}S/ (  
  hHook=NULL; M"<B@p]rk:  
 } u8i!Fxu  
 return unhooked; ^|ln q.j  
} "1%YtV5R{  
EnnE@BJ"  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) u40<>A  
{ YO`V'6\  
 BOOL bAdded=FALSE; ?'r=>'6D  
 for(int index=0;index<MAX_KEY;index++){ |$a!Zx94^  
  if(hCallWnd[index]==0){ H m Z*  
   hCallWnd[index]=hWnd; d{G*1l(X  
   HotKey[index]=cKey; We*&\e+"T  
   HotKeyMask[index]=cMask; *B1%-  
   bAdded=TRUE; l5esx#([*R  
   KeyCount++; zY&/^^y  
   break; qA5PIEvdq  
  } Ij9ezNZT=  
 } %[H|3  
 return bAdded; a\?-uJ+  
} 4-veO3&.h  
zKX|m-i|2  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 3"y,Ut KGa  
{ Ht=h9}x"g  
 BOOL bRemoved=FALSE; }D\i1/Y  
 for(int index=0;index<MAX_KEY;index++){ `hE@S |4  
  if(hCallWnd[index]==hWnd){ W"*~1$vf  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ,"EgYd8-'  
    hCallWnd[index]=NULL; 86 <[!ZM  
    HotKey[index]=0; -"MB(`  
    HotKeyMask[index]=0; ),]XN#jp(u  
    bRemoved=TRUE; g|rbkK%SoE  
    KeyCount--; kKEs >a  
    break; s2ixiv=  
   } On4tK\l @  
  } TIre,s)_  
 } 2u?k;"]V  
 return bRemoved; f15f)P  
} |w w@V<'/#  
1a>TJdoa  
void VerifyWindow() Q% LQP!Kg  
{ vv5 uU8  
 for(int i=0;i<MAX_KEY;i++){ y=spD^tM8  
  if(hCallWnd!=NULL){ 1^_V8dm)  
   if(!IsWindow(hCallWnd)){ yV/A%y-P  
    hCallWnd=NULL; # 8fq6z|JZ  
    HotKey=0; [/IN820t  
    HotKeyMask=0; TZYz`l+v  
    KeyCount--; 5T- N\)@  
   } P{gy/'PH,  
  } C3>`e3v  
 } =#|K-X0d=  
} -N~eb^3[c  
3C7}V{?  
BOOL CHookApp::InitInstance() J2d 3&6  
{ T.x"a$AU  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); HHcWyu  
 hins=AfxGetInstanceHandle(); oQ"J>`',  
 InitHotkey(); Z%\*\6L)  
 return CWinApp::InitInstance(); -J\R}9 lIm  
} qVMBZ\`Qm  
bL9vjD'}  
int CHookApp::ExitInstance() ;'~GuZ#I  
{ *Y/}E X! F  
 VerifyWindow(); 7t~12m8x  
 UnInit(); LOf)D7T  
 return CWinApp::ExitInstance(); (Ceq@eAlT  
} rVF7!|&  
 %kSpMj|  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ipdGAG  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) C|hD^m  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 1}Mdo&:t  
#if _MSC_VER > 1000 D3xyJ  
#pragma once Q@w=Jt<  
#endif // _MSC_VER > 1000 Tj v)jD  
]mSkjKw  
class CCaptureDlg : public CDialog t],5{UF  
{ jNu`umS  
 // Construction cH>3|B*y  
 public: YR/%0^M'0  
  BOOL bTray; 6h%_\I.Z[[  
  BOOL bRegistered; +o[- ED  
  BOOL RegisterHotkey(); Bq4^nDK  
  UCHAR cKey; g886RhCe  
  UCHAR cMask; {RPZq2Tpc  
  void DeleteIcon(); ZxvBo4>tH  
  void AddIcon(); Kdr7JQYzuz  
  UINT nCount; ^DH*\ee  
  void SaveBmp(); .qAlPe L:  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor yirQ  
  // Dialog Data 9w:9XziT  
  //{{AFX_DATA(CCaptureDlg) bj$VYS"kY  
  enum { IDD = IDD_CAPTURE_DIALOG }; VS ?npH  
  CComboBox m_Key; (HD8Mm  
  BOOL m_bControl; uXkc07 r'  
  BOOL m_bAlt; F\IJim-Rh  
  BOOL m_bShift; 3tu:Vc.:M  
  CString m_Path; V~! lY\  
  CString m_Number; ilr'<5 rq  
  //}}AFX_DATA QK0-jYG^  
  // ClassWizard generated virtual function overrides Oi-= Fp  
  //{{AFX_VIRTUAL(CCaptureDlg) ngI3.v/R  
 public: cypb 6Q_  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ZW)_dg9  
 protected: -gK*&n~  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support n1J;)VyR  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); }$E341@  
  //}}AFX_VIRTUAL =s5g9n+7  
  // Implementation ;VW->i a6  
 protected: nC2e^=^  
  HICON m_hIcon; tS:/:0HnA)  
  // Generated message map functions ,!7\?=G6}v  
  //{{AFX_MSG(CCaptureDlg) Pg\!\5  
  virtual BOOL OnInitDialog(); fv+t%,++:  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); y13Y,cz~B  
  afx_msg void OnPaint(); 5[5|_H+0  
  afx_msg HCURSOR OnQueryDragIcon(); v_L2>Pa.  
  virtual void OnCancel(); K2 b\9}  
  afx_msg void OnAbout(); J_eu(d[9  
  afx_msg void OnBrowse(); On*pI37(\  
  afx_msg void OnChange(); [8v>jQ)  
 //}}AFX_MSG Um2RLM%  
 DECLARE_MESSAGE_MAP() =Owr l'@|T  
}; v-ZTl4j$  
#endif 3GVS-?  
yhG%@vSq  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file |zCT~#  
#include "stdafx.h" 4157!w'\y  
#include "Capture.h" /(jG9RM  
#include "CaptureDlg.h" "HwSW4a]  
#include <windowsx.h> 5 ^867  
#pragma comment(lib,"hook.lib") -XNawpl`  
#ifdef _DEBUG ##r9/`A  
#define new DEBUG_NEW W:hg*0z-*  
#undef THIS_FILE (mOL<h[)IP  
static char THIS_FILE[] = __FILE__; rJ=r_v  
#endif Xdl7'~k  
#define IDM_SHELL WM_USER+1 ?4%@"49n X  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); u0{R;)  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); z`esst\aV  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39};  e gdbv  
class CAboutDlg : public CDialog *VV#o/Q p  
{ ;6AanwR6  
 public: \S]` { kY,  
  CAboutDlg(); Fz.Ij'8.H  
  // Dialog Data Da-U@e!  
  //{{AFX_DATA(CAboutDlg) V ah&)&n  
  enum { IDD = IDD_ABOUTBOX }; R8bKE(*rxj  
  //}}AFX_DATA 0i3Z7l]  
  // ClassWizard generated virtual function overrides Gr8%%]1!0  
  //{{AFX_VIRTUAL(CAboutDlg) ,`,1s 9\&t  
 protected: ^{ {0ajI9C  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support U ljWBd  
  //}}AFX_VIRTUAL ,Z$!:U  
  // Implementation Y5z5LG4  
 protected: |A,<m#C  
  //{{AFX_MSG(CAboutDlg) %n@ ^$&,&;  
  //}}AFX_MSG A~M.v0  
  DECLARE_MESSAGE_MAP() x^~@`]TV^  
}; 8.ej65r*   
J?"v;.K|hU  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) X+[h]A  
{ k3CHv=U{  
 //{{AFX_DATA_INIT(CAboutDlg) 6;Sz^W  
 //}}AFX_DATA_INIT Jt(RF*i  
} 7KJ%-&L^  
^@HWw@GA  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 31 &;3?3>  
{ -^ R?O  
 CDialog::DoDataExchange(pDX); m(KBg'kQ  
 //{{AFX_DATA_MAP(CAboutDlg) w\lc;4U   
 //}}AFX_DATA_MAP \N[2-;[3  
} >J) 9&?  
+%=lu14G  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) M REB  
 //{{AFX_MSG_MAP(CAboutDlg) >UnLq:G  
 // No message handlers V>(>wSR  
 //}}AFX_MSG_MAP p1!-|Sqq  
END_MESSAGE_MAP() e:+[}I)  
vlC$0P  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) I3;03X<2  
: CDialog(CCaptureDlg::IDD, pParent) LbUH`0:%t  
{ p`)Mk<`dYD  
 //{{AFX_DATA_INIT(CCaptureDlg) C 8KV<k  
  m_bControl = FALSE;  {HbSty  
  m_bAlt = FALSE; ^;'FC vd  
  m_bShift = FALSE; Xmw%f[Xl  
  m_Path = _T("c:\\"); UK5u"@T  
  m_Number = _T("0 picture captured."); aNUM F  
  nCount=0; p}p}!M|  
  bRegistered=FALSE; Vl/fkd,Z  
  bTray=FALSE; 3FG'A[x3O  
 //}}AFX_DATA_INIT hdDL92JVg  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 )(+q~KA}  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); _sAcvKH  
} p]rV\,Yss  
{sW>J0  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) I<qG{PA  
{ 6 \}.l  
 CDialog::DoDataExchange(pDX); ${{[g16X  
 //{{AFX_DATA_MAP(CCaptureDlg) }CM#jN?(  
  DDX_Control(pDX, IDC_KEY, m_Key); BVG.ZZR})  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 2(k m]H^  
  DDX_Check(pDX, IDC_ALT, m_bAlt); I#/"6%e  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); q{l %k  
  DDX_Text(pDX, IDC_PATH, m_Path); 2 $Umqt  
  DDX_Text(pDX, IDC_NUMBER, m_Number); *X uIA-9  
 //}}AFX_DATA_MAP 3,0b<vfSv  
} MDCwgNPiQW  
d)kOW!5\  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ^B$cfs@*  
//{{AFX_MSG_MAP(CCaptureDlg) M^{=&  
 ON_WM_SYSCOMMAND() n(#[[k9&Ic  
 ON_WM_PAINT() {~`{bnx^]7  
 ON_WM_QUERYDRAGICON() >02p,W6S>  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) yp]z@SYA@  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) w1LZ\nA<  
 ON_BN_CLICKED(ID_CHANGE, OnChange) g>QN9v})  
//}}AFX_MSG_MAP w[g`)8Ib  
END_MESSAGE_MAP() e)$a;6  
_wUg+Xs]  
BOOL CCaptureDlg::OnInitDialog() 4+:'$Nw  
{ Ctbc!<@o  
 CDialog::OnInitDialog(); :A+}fB IN  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); "a-;?S&  
 ASSERT(IDM_ABOUTBOX < 0xF000); mhI   
 CMenu* pSysMenu = GetSystemMenu(FALSE); {7Hc00FM  
 if (pSysMenu != NULL) 7c83g2|%   
 { F_@?'#m  
  CString strAboutMenu; eq@-J+  
  strAboutMenu.LoadString(IDS_ABOUTBOX); `SQobH  
  if (!strAboutMenu.IsEmpty()) vr4{|5M  
  { CYYo+5x  
   pSysMenu->AppendMenu(MF_SEPARATOR); O~|Y#T  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); T%aM~dp  
  } [e o=  
 } UAGh2?q2  
 SetIcon(m_hIcon, TRUE); // Set big icon &q +l5L"  
 SetIcon(m_hIcon, FALSE); // Set small icon C=t9P#g*.  
 m_Key.SetCurSel(0); O*yA50Cn  
 RegisterHotkey(); h0")NBRV&  
 CMenu* pMenu=GetSystemMenu(FALSE); pGr4b:N  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ,I H~  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); vCUbbQz  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 7n*"9Ai(  
 return TRUE; // return TRUE unless you set the focus to a control G4ycP8  
} nF]zd%h  
Bm;: cmB0e  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 9W&nAr  
{ tB VtIOm9  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) K/_"ybR7  
 { 3|%058bF  
  CAboutDlg dlgAbout; a7aj:.wi  
  dlgAbout.DoModal(); >z7 3uKA(  
 } R&Ss ET.  
 else <{i1/"k?X  
 { thz[h5C?C  
  CDialog::OnSysCommand(nID, lParam); m#<Jr:-  
 } Kw(S<~9-@  
} "q KVGd  
rDGrq9  
void CCaptureDlg::OnPaint() JAy-N bb\  
{ v6ei47-  
 if (IsIconic()) n<1*cL:8B  
 { WLiFD.  
  CPaintDC dc(this); // device context for painting ZC`VuCg2O  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); _na/&J 6  
  // Center icon in client rectangle |l@z7R+4*  
  int cxIcon = GetSystemMetrics(SM_CXICON); WM7LCP  
  int cyIcon = GetSystemMetrics(SM_CYICON); *JAC+<~d  
  CRect rect; GI>(S  
  GetClientRect(&rect); .>S1do+  
  int x = (rect.Width() - cxIcon + 1) / 2; J> "qeR /  
  int y = (rect.Height() - cyIcon + 1) / 2; + Y!:@d  
  // Draw the icon s^m`qi(H  
  dc.DrawIcon(x, y, m_hIcon); p0PK-e`@:  
 } |.;]e[&  
 else H;0K4|I  
 { KwgFh#e  
  CDialog::OnPaint(); ([#'G+MC&  
 } ={51fr/C%  
} ' H4m"  
yCuLo`  
HCURSOR CCaptureDlg::OnQueryDragIcon() @d:GtAW  
{ Gl"hn  
 return (HCURSOR) m_hIcon; (M<l}pl)  
} gf}*}8D  
;@ G^eQ  
void CCaptureDlg::OnCancel() yYrFk^  
{ Y#+Ws0wN  
 if(bTray) S(/ ^_Y  
  DeleteIcon(); +VL:O]`DJ  
  CDialog::OnCancel(); )l.AsfW%  
} .m.Ga|;  
O8Z+g{  
void CCaptureDlg::OnAbout() D5:|CMQ  
{ DK20}&RQ  
 CAboutDlg dlg; 14A(ZWwq9  
 dlg.DoModal(); 3!%-O:!  
} 8l'W[6  
PXML1.r$Q  
void CCaptureDlg::OnBrowse() e,d}4 jy  
{ @|s$ :;(=  
 CString str; HU$]o N  
 BROWSEINFO bi; }R%*J  
 char name[MAX_PATH]; 5,-:31(j\  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); MNp4=R  
 bi.hwndOwner=GetSafeHwnd(); 'Ydr_Ses  
 bi.pszDisplayName=name; JSID@ n<b?  
 bi.lpszTitle="Select folder"; *IIA"tC  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; )2#q i/  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); &%g$Bi,G  
 if(idl==NULL) #XG3{MGX[  
  return; R / ND f`  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); A~X\ dcn  
 str.ReleaseBuffer(); f'*/IG  
 m_Path=str; (?TK P 7  
 if(str.GetAt(str.GetLength()-1)!='\\') /F46Ac}I  
  m_Path+="\\"; IusZYB  
 UpdateData(FALSE); :*^aSPlV  
} A%x0'?GU  
FHEP/T\5  
void CCaptureDlg::SaveBmp() 3177R>0  
{ mwsdl^c  
 CDC dc; #,97 ]  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); |'I>Ojm  
 CBitmap bm; KW3<5+w]c  
 int Width=GetSystemMetrics(SM_CXSCREEN); <L<^uFB  
 int Height=GetSystemMetrics(SM_CYSCREEN); u /DE  
 bm.CreateCompatibleBitmap(&dc,Width,Height); q*tGlM@R?  
 CDC tdc; bZ:xH48MY  
 tdc.CreateCompatibleDC(&dc); F1BXu@~e(  
 CBitmap*pOld=tdc.SelectObject(&bm); %yd(=%)fMB  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); y4$$*oai&  
 tdc.SelectObject(pOld); W*DK pJy  
 BITMAP btm; _1mpsY<k  
 bm.GetBitmap(&btm); X|G[Ma?   
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 2-jXj9kp`  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); oE6`]^^  
 BITMAPINFOHEADER bih; 7WY~v2SDF  
 bih.biBitCount=btm.bmBitsPixel; 1Kr$JIcd  
 bih.biClrImportant=0; +-9-%O.(;  
 bih.biClrUsed=0; D u T6Od/f  
 bih.biCompression=0; sv!v`zh  
 bih.biHeight=btm.bmHeight; ?k($Tc&Q  
 bih.biPlanes=1; !YI<A\P  
 bih.biSize=sizeof(BITMAPINFOHEADER); o!U(=:*b  
 bih.biSizeImage=size; UFu0{rY_  
 bih.biWidth=btm.bmWidth; r=SC bv  
 bih.biXPelsPerMeter=0; q2'}S A/  
 bih.biYPelsPerMeter=0; !^s -~`'\~  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); cP\z*\dS  
 static int filecount=0; ew~?&=  
 CString name; R eb.x_  
 name.Format("pict%04d.bmp",filecount++); Q1ayd$W@<  
 name=m_Path+name; %d *0"<v  
 BITMAPFILEHEADER bfh; l9OpaOVfJ  
 bfh.bfReserved1=bfh.bfReserved2=0; Dsn=fht  
 bfh.bfType=((WORD)('M'<< 8)|'B'); m*CW3y{n)  
 bfh.bfSize=54+size; ^fH)E"qq5  
 bfh.bfOffBits=54; d{t@+}0.u  
 CFile bf; pzoh9}bue  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ]9)iBvQlj  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); #sBL E  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 6 eu7&Kj'  
  bf.WriteHuge(lpData,size); _}ii1fLv  
  bf.Close(); l'@!'  
  nCount++; B3D}'<  
 } VBS}2>p  
 GlobalFreePtr(lpData); "A&A?%  
 if(nCount==1) \13Q>iAu  
  m_Number.Format("%d picture captured.",nCount); 7Z~JuTIZ  
 else *9xxX,QT8Q  
  m_Number.Format("%d pictures captured.",nCount); <2L,+  
  UpdateData(FALSE); %{pjC7j#  
} 68(^*  
cruBJZr*  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) =:zPT;K  
{ @YQ*a4`  
 if(pMsg -> message == WM_KEYDOWN) XjP &  
 { /#SfgcDt  
  if(pMsg -> wParam == VK_ESCAPE) 9_F&G('V{a  
   return TRUE; LI25VDZ|iP  
  if(pMsg -> wParam == VK_RETURN) l6 }+,v@#  
   return TRUE; f~PS'I_r  
 } 7R m\#  
 return CDialog::PreTranslateMessage(pMsg); NZ&ZK@h}.  
} UKV<Ye|  
x?lRObHK  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) `LLmdm 6i  
{ /5z,G r  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ " DLIx}  
  SaveBmp(); %3"3V1  
  return FALSE; m. p'LF  
} Lwx J:Kz.  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ bvrXz-j  
 CMenu pop; - 0q263z  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 2boyBz}=S  
 CMenu*pMenu=pop.GetSubMenu(0); /; /:>c  
 pMenu->SetDefaultItem(ID_EXITICON); 9N{?J"ido  
 CPoint pt; hkm}oYW+  
 GetCursorPos(&pt); ,c$tKj5ulQ  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ujkWVE'  
 if(id==ID_EXITICON) _b>{:H&\  
  DeleteIcon(); _-TW-{7bh  
 else if(id==ID_EXIT) @ S[As~9X  
  OnCancel(); YVv E>1z  
 return FALSE; Yy 0" G  
} uDkX{<_Xe  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); =+Odu  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) oNw=O>v  
 AddIcon(); S)wP];]`K  
 return res; A+foc5B  
} [KHlApL  
s]6;*mI2  
void CCaptureDlg::AddIcon() "crp/Bj?  
{ OFmHj]I7=  
 NOTIFYICONDATA data; LAnC8O  
 data.cbSize=sizeof(NOTIFYICONDATA); !OQ5AF$  
 CString tip; 4)k-gKS*  
 tip.LoadString(IDS_ICONTIP); rNo/H<J%+j  
 data.hIcon=GetIcon(0); hGw}o,g  
 data.hWnd=GetSafeHwnd(); >5Lp;  
 strcpy(data.szTip,tip); `q* p-Ju'  
 data.uCallbackMessage=IDM_SHELL; ~x/ka43  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; y!}XlllV  
 data.uID=98; ef&8L  
 Shell_NotifyIcon(NIM_ADD,&data); z^.dYb7<  
 ShowWindow(SW_HIDE); hcRe,}wJ  
 bTray=TRUE; ^b`-zFL7  
} O9_1a=M  
8@(?E[&O>  
void CCaptureDlg::DeleteIcon() @_$$'XA7  
{ lF.kAEC  
 NOTIFYICONDATA data; V!Sm,S(  
 data.cbSize=sizeof(NOTIFYICONDATA); 3{t[>O;  
 data.hWnd=GetSafeHwnd(); ^'M^0'_"v  
 data.uID=98; ,dK)I1"C  
 Shell_NotifyIcon(NIM_DELETE,&data); @RszPH1B  
 ShowWindow(SW_SHOW); H25Qx;(dTk  
 SetForegroundWindow(); pjTJZhT2I  
 ShowWindow(SW_SHOWNORMAL); gp{C89gP  
 bTray=FALSE; <-b9 )>  
} sR83e|4I  
=Hn--DEMg  
void CCaptureDlg::OnChange() /3^XJb$Sa  
{ iymN|KdpaZ  
 RegisterHotkey(); :aaX Y:<  
} |4 \2,M#  
4r ~K`)/S'  
BOOL CCaptureDlg::RegisterHotkey() yvzH}$!]  
{ yp^k;G?_d  
 UpdateData(); ^VG].6  
 UCHAR mask=0; 1P1h);*Z  
 UCHAR key=0; EmrkaV-?k  
 if(m_bControl) hDSf>X_*_G  
  mask|=4; Cd=$XJ-b  
 if(m_bAlt) irq{ 21  
  mask|=2; IvkYM`%  
 if(m_bShift) "M-';;  
  mask|=1; 9$e$L~I#u  
  key=Key_Table[m_Key.GetCurSel()]; l4r >#n\yj  
 if(bRegistered){ ];6955I!  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Ai[@2AyU  
  bRegistered=FALSE; JrLh=0i9  
 } Hd\oV^ >  
 cMask=mask; _6,\;"it?8  
 cKey=key; w|S b`eR  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); #|(>UM\  
 return bRegistered; Z : xb8]y  
} x*'H@!!G  
Pp8G2|bz  
  四、小结 U?{oxy_[2  
Wu|MNB?M  
  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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