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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: qBKRm0<W  
  0'IV"eH2  
  一、实现方法 F?wfh7q  
/7 CF f&4  
  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: 4Y)rgLFj  
*,:>EcDr  
#pragma data_seg("shareddata") q*|H*sS  
HHOOK hHook =NULL; //钩子句柄 Sd !!1a s  
UINT nHookCount =0; //挂接的程序数目 kf8-#Q/B  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 `5V=U9zdE  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 c&{1Z&Y  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey .K=r.tf~  
static int KeyCount =0; ?+]prbt)  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 3~I|KF7x  
#pragma data_seg() LX [_6  
\{HbL,s  
  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。 rff=ud>Jf  
\pXs&}%1,F  
  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: h~]G6>D9)>  
OO Hw-MW  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR #E?TE  
cKey,UCHAR cMask) e'FBV[e  
{ "B~c/%#PH  
 BOOL bAdded=FALSE; =q1=.VTn  
 for(int index=0;index<MAX_KEY;index++){ OR&'  
  if(hCallWnd[index]==0){ v-k~Q$7~  
   hCallWnd[index]=hWnd; PgeC\#;9  
   HotKey[index]=cKey; #mI{D\UR  
   HotKeyMask[index]=cMask; 5/vfmDt3'G  
   bAdded=TRUE; INi9`M.h  
   KeyCount++; ~$GRgOn  
   break; PJq;OM|  
  } yMU>vr  
 } 0h[p w   
 return bAdded; Z`UwXp_s  
} |\?mX=a.y  
//删除热键 ;"}yVV/4  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) >tUi ;!cQ  
{ M.|cl#  
 BOOL bRemoved=FALSE; ,f4VV\  
 for(int index=0;index<MAX_KEY;index++){ Q]9+-p(=  
  if(hCallWnd[index]==hWnd){ U7)#9qS4  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ gn2*'_V~3  
    hCallWnd[index]=NULL; $2p=vi 3  
    HotKey[index]=0; otA59 ;Z  
    HotKeyMask[index]=0; -YXNB[C  
    bRemoved=TRUE; Gb=pQ (n4  
    KeyCount--; KT3W>/#E  
    break; LW={| 3}  
   } P=.yXirm?  
  } mv5=>Xc6  
 } +VJS/  
 return bRemoved; ! :[`>=!  
} :bh#,]'  
J**-q(>  
FeW}tKH  
  DLL中的钩子函数如下: @%(Vi!Cv"R  
SdOa#U)  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) )\ `AD#  
{ zTgY=fuz  
 BOOL bProcessed=FALSE; j20/Q)=h  
 if(HC_ACTION==nCode) Lro[ |A  
 { Q]JWWKt6rV  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Dl a }-A:  
   switch(wParam) (i1 JDe  
   {  N~""Lc&  
    case VK_MENU: p?uk|C2  
     MaskBits&=~ALTBIT; }ZQ)]Mr  
     break; YUzx,Y>k  
    case VK_CONTROL: QKW\z aG  
     MaskBits&=~CTRLBIT; 5r&bk`  
     break; bW]7$?acv  
    case VK_SHIFT: HE;}B!>  
     MaskBits&=~SHIFTBIT; y*F !k{P  
     break; wbIgZ]o!/;  
    default: //judge the key and send message L}~"R/iWCT  
     break; [>2iz  
   } s6q6)RD"  
   for(int index=0;index<MAX_KEY;index++){ I_1(jaY  
    if(hCallWnd[index]==NULL) xRX2u_f$<  
     continue; Qm-I=Rh+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) jW,b"[  
    { / [s TN.MG  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Y FJw<5&  
     bProcessed=TRUE; oZD+AF$R  
    } VjI=5)+~  
   } 4YV 0v,z  
  } ,4Q1[K35B  
  else if((lParam&0xc000ffff)==1){ //有键按下 TpAE9S  
   switch(wParam) fH@P&SX  
   { ty"|yA  
    case VK_MENU: WE{fu{x  
     MaskBits|=ALTBIT; XIGz_g;#'w  
     break; H*m3i;"4p\  
    case VK_CONTROL: ~+A(zlYr~  
     MaskBits|=CTRLBIT; -wh?9 ?W  
     break; h SeXxSb:  
    case VK_SHIFT: ]9 JLu8GO  
     MaskBits|=SHIFTBIT; R)@2={fd}  
     break; -JEiwi,  
    default: //judge the key and send message J~]Y  
     break; oe'f?IY  
   } 5}3#l/  
   for(int index=0;index<MAX_KEY;index++){ P<%}!Y  
    if(hCallWnd[index]==NULL) rD\)ndPv  
     continue; fT2F$U  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \,AE5hnO  
    { YE*%Y["  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); r|_@S[hZg  
     bProcessed=TRUE; CN{xh=2qY[  
    } d-sT+4o}  
   } Q$yMU [l)  
  } 1dhuLN%Ce  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 e=cb%  
   for(int index=0;index<MAX_KEY;index++){ _qxBjB4t"a  
    if(hCallWnd[index]==NULL) S8j!?$`  
     continue; C09rgEB\B  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) {;L,|(o^  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Cqs+ o^q  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 W ZT) LYA  
   } ^Q\Hy\  
  } 57K\sT4[  
 } BXb=N E  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); fTOGW`s^  
} 7D KTd^^M  
83adnm  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: /fSsh;F  
8\X-]Gh\^  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 2Ij,OIcdBE  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Op'&c0l  
g8SVuG<DI\  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: eJ%b"H!  
\8Hs[H!  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) M ZAz= )-  
{ S}b^_+UbP  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) hm\UqIt  
 { kaT  !   
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 N>H#Ew@2U  
  SaveBmp(); kz*6%Cg*~  
  return FALSE; P;G]qV%  
 } :O'QL,  
 …… //其它处理及默认处理 U2Tw_  
} .OpG2P  
.6LlkM6[g  
_-T^YeQ/  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 bzXeG;c<7  
`h'7X(  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 ~>#?.f  
<t&Qa~mA  
  二、编程步骤 1I awi?73  
cy(4g-b]@e  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; <])]1r8  
|vw],r6  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; K(uz`(5  
X<D fzd oI  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 8wrO64_NO  
Bp_8PjQ  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; rEMe=>^   
OQIr"  
  5、 添加代码,编译运行程序。 Zq~Rkx  
;Nw)zS  
三、程序代码 p'0X>>$  
KO\-|#3y>  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ~: fSD0  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Ou4 `#7FR  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ %>y`VN D  
#if _MSC_VER > 1000 ' <?=!&\D  
#pragma once #N$\d4q9  
#endif // _MSC_VER > 1000 m^~5Xr"  
#ifndef __AFXWIN_H__ (HXKa][T  
#error include 'stdafx.h' before including this file for PCH .Y0O.  
#endif gq]@*C  
#include "resource.h" // main symbols ;Dbx5-t  
class CHookApp : public CWinApp !|l7b2NEz-  
{ ^`[<%.  
 public: (5;nA'  
  CHookApp(); sPMICIv|  
  // Overrides '5b0 K1$"  
  // ClassWizard generated virtual function overrides EOZ 6F-':  
  //{{AFX_VIRTUAL(CHookApp) ~Zn|(  
 public: AmZW=n2^  
  virtual BOOL InitInstance(); {;|pcx\L6~  
  virtual int ExitInstance(); 3B='f"G  
  //}}AFX_VIRTUAL ))dw[Xa  
  //{{AFX_MSG(CHookApp) 1G6 \}El95  
  // NOTE - the ClassWizard will add and remove member functions here. C+t0Zen  
  // DO NOT EDIT what you see in these blocks of generated code ! O')=]6CQ*  
  //}}AFX_MSG h;#046-7  
  DECLARE_MESSAGE_MAP() 5UJ ?1"J  
}; J(K/z,4h  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); \*&?o51 !e  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $)  M2  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ff7#LeB9  
BOOL InitHotkey(); !Eg2#a?  
BOOL UnInit(); &8pGq./lr=  
#endif !C|Z+w9Y  
3 l}9'j  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ~;z] _`_Va  
#include "stdafx.h" M~7Cb>%<  
#include "hook.h" VC0Tqk  
#include <windowsx.h>  "UreV  
#ifdef _DEBUG 8f1M6GK?  
#define new DEBUG_NEW Bd 0oA )i  
#undef THIS_FILE kBLFK3i  
static char THIS_FILE[] = __FILE__; 6"o=`Sq  
#endif c&P/v#U_  
#define MAX_KEY 100 1V9AnzwX  
#define CTRLBIT 0x04 E=CAWj\  
#define ALTBIT 0x02 MkHkM  
#define SHIFTBIT 0x01 k<P`  
#pragma data_seg("shareddata") *~YdL7f)J  
HHOOK hHook =NULL; /CH]'u^j  
UINT nHookCount =0; 6"+9$nFyW  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ?A3u2-  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT o>nw~_ H\  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey _BY+Tfol  
static int KeyCount =0; vQp'bRR  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift :?j=MV  
#pragma data_seg() :nR80]  
HINSTANCE hins; }K@m4`T  
void VerifyWindow(); )-o jm$  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) NMfHrYHbh  
//{{AFX_MSG_MAP(CHookApp) YK[2KTlo  
// NOTE - the ClassWizard will add and remove mapping macros here. sVBr6 !v=  
// DO NOT EDIT what you see in these blocks of generated code! Mtv{37k~  
//}}AFX_MSG_MAP H3*] }=   
END_MESSAGE_MAP() }!{R;,5/n  
\<(EV,m2  
CHookApp::CHookApp() n$XEazUb0N  
{ :4-,Ru1C"  
 // TODO: add construction code here, +Adk1N8  
 // Place all significant initialization in InitInstance ^ >&#F[aT  
} @C!&lrf3  
NP\mzlI~@  
CHookApp theApp; 5jso)`IL  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) X(eW+,H  
{ S[2?,C<2=  
 BOOL bProcessed=FALSE; f^*Yqa  
 if(HC_ACTION==nCode) :aBxyS*}G  
 { ,}]v7DD  
  if((lParam&0xc0000000)==0xc0000000){// Key up M]p-<R\  
   switch(wParam) k7Qs#L  
   { (_!I2"Q*  
    case VK_MENU: vb?.`B_>&  
     MaskBits&=~ALTBIT; {aq)Y>o5:T  
     break; ~c<8;,cjYR  
    case VK_CONTROL: S5u$I  
     MaskBits&=~CTRLBIT; kS &>g  
     break; XVqkw@Ia4!  
    case VK_SHIFT: @8>bp#x/1  
     MaskBits&=~SHIFTBIT; _k26(rdI@-  
     break; .D ^~!A  
    default: //judge the key and send message =R' O5J  
     break; n42\ty9  
   } _tX=xAO9  
   for(int index=0;index<MAX_KEY;index++){ Y2XxfZ j  
    if(hCallWnd[index]==NULL) ~-6_-Y|  
     continue; |nWEuKHy  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ?T_MP"  
    { g)^s+Y  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); De^:9<{jc  
     bProcessed=TRUE; [520!JhZY  
    } \eNB L[  
   } M;Pry 3J  
  } lq"X_M$  
  else if((lParam&0xc000ffff)==1){ //Key down - z+,j(@  
   switch(wParam) +B1&bOb  
   { d4BzFGsW  
    case VK_MENU: %Z<{CV  
     MaskBits|=ALTBIT; Q&vdBO/  
     break; ~G@YA8}  
    case VK_CONTROL: ha$1vi}b  
     MaskBits|=CTRLBIT; 65dMv*{  
     break; {&>rKCi  
    case VK_SHIFT: 2b"DkJj'  
     MaskBits|=SHIFTBIT; Cs[ d:T  
     break; f$\ O:E=  
    default: //judge the key and send message &K60n6q{aQ  
     break; _qf39fM;\  
   } /q\e&&e  
   for(int index=0;index<MAX_KEY;index++) ~a[ /l  
   { bA,Zfsr6#  
    if(hCallWnd[index]==NULL) mi<Q3;m  
     continue; X*@ tp,t  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `j@1]%&z  
    { 6 h#U,G  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); po*8WSl9c[  
     bProcessed=TRUE; 6];3h>c]N  
    } KS93v9|  
   } 3sdL\  
  } qE[YZ(/f0&  
  if(!bProcessed){ vs=q<Uw)  
   for(int index=0;index<MAX_KEY;index++){ "lw|EpQk`  
    if(hCallWnd[index]==NULL) |&JeJ0k>~  
     continue; c/tB_]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) hBpa"0F  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); O# ZZ PJ"  
   } QHZ",1F  
  } o zn&>k  
 } -grf7w^  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Y2QX<  
} zaHZ5%{LQD  
7$lnCvm  
BOOL InitHotkey() clV^Xg8D  
{ B8T$<  
 if(hHook!=NULL){ |mQ Fi\  
  nHookCount++; $U]T8;5Q  
  return TRUE; #DFi-o&-  
 } &H;,,7u  
 else =oSd M2  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Kus=.(  
  if(hHook!=NULL) $\h-F8|JMX  
   nHookCount++; ap}p?r  
  return (hHook!=NULL); nS%jnp#  
} 2L1 ,;  
BOOL UnInit() c#}K,joeU  
{ Ql)hIf$Oo  
 if(nHookCount>1){ i m;6$3  
  nHookCount--; B??07j  
  return TRUE; j8&NscK)  
 } $N)G:=M!s  
 BOOL unhooked = UnhookWindowsHookEx(hHook); zVw5(Tc  
 if(unhooked==TRUE){ \OVtvJV]  
  nHookCount=0; `R8&(kQ  
  hHook=NULL; d6QrB"J`  
 } 9m$;C'}Z  
 return unhooked; <Pt?N2]A|  
} Z)W8Of_  
X%5eZ"1{x  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) H/*ol^X7  
{ Tl2t\z+ps  
 BOOL bAdded=FALSE; )/::i O&$:  
 for(int index=0;index<MAX_KEY;index++){ j %gd:-tA  
  if(hCallWnd[index]==0){ +,>%Yb =EA  
   hCallWnd[index]=hWnd; "g ^i%  
   HotKey[index]=cKey; zk8 )!Af  
   HotKeyMask[index]=cMask; {s0%XG1$  
   bAdded=TRUE; Y\-xX:n.\  
   KeyCount++; UrvUt$WO  
   break; dz9U.:C  
  } Z{0BH{23  
 } f+ceL'fr  
 return bAdded; 8-nf4=ll  
} ~%/Rc`  
zg<-%r'$  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)  '/.Dxib  
{ V+ ("kz*  
 BOOL bRemoved=FALSE; !g]5y=  
 for(int index=0;index<MAX_KEY;index++){ TR0y4u[  
  if(hCallWnd[index]==hWnd){ 8J(j}</>a  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ >5~#BrpwG  
    hCallWnd[index]=NULL; nL:&G'd  
    HotKey[index]=0; `]eJF|"  
    HotKeyMask[index]=0; LOx+?4|y  
    bRemoved=TRUE; _K~h? \u  
    KeyCount--; lWId 0eNS  
    break; eA4:]A"  
   } +Ua|0>?  
  } F$?Ab\#B  
 } ;yt6Yp.6e  
 return bRemoved; ?N<My& E  
} ;9T}h2^`B  
%f1%9YH  
void VerifyWindow()  h$l/wn  
{ }%jF!d  
 for(int i=0;i<MAX_KEY;i++){ R#d~a;j  
  if(hCallWnd!=NULL){ rY_~(?XS  
   if(!IsWindow(hCallWnd)){ 9Lb96K?=>  
    hCallWnd=NULL; nTqU~'d'  
    HotKey=0; CjQO5  
    HotKeyMask=0; .c"nDCFVR  
    KeyCount--; ^}=)jLS  
   } y d 97ys  
  } `-L?x2)U  
 } dM-cQo:  
} 1(?4*v@B  
.zO2g8(VR  
BOOL CHookApp::InitInstance() c1'@_Is  
{ X,|8Wpi=  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); FXof9fa_B  
 hins=AfxGetInstanceHandle(); YJ _eE  
 InitHotkey(); Lj1l ]OD  
 return CWinApp::InitInstance(); ;?2)[a  
} hC:'L9Y  
4qOzjEQ  
int CHookApp::ExitInstance() !wy _3a  
{ i<Vc~ !pT  
 VerifyWindow(); p'/\eBhG]=  
 UnInit(); At(88(y-W  
 return CWinApp::ExitInstance(); )5Khl"6!z  
} s:U:Dv  
03 @a G  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 5CkG^9  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) K~ eak\=  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_  ?.?)5 &4  
#if _MSC_VER > 1000 e%\^V\L  
#pragma once Pp8S\%z~h  
#endif // _MSC_VER > 1000 Js,!G  
p27Dc wov  
class CCaptureDlg : public CDialog )O1]|r7v  
{ i1 E|lp)  
 // Construction #aP#r4$  
 public: 4 mX(.6  
  BOOL bTray; _ .vG)  
  BOOL bRegistered; } !m43x/&  
  BOOL RegisterHotkey(); o^"+X7)  
  UCHAR cKey;  q#K{~:  
  UCHAR cMask; -N45ni87  
  void DeleteIcon(); w+br)  
  void AddIcon(); gmL~n7m:K  
  UINT nCount; hw DxGiU  
  void SaveBmp(); fq7#rZCxX  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor "Oxr}^% i  
  // Dialog Data k"N>pjgd$  
  //{{AFX_DATA(CCaptureDlg) %~LY'cfPse  
  enum { IDD = IDD_CAPTURE_DIALOG }; zKQ<Zr  
  CComboBox m_Key; HGQ</5Z  
  BOOL m_bControl; sfM"!{7  
  BOOL m_bAlt; fzSkl`K}  
  BOOL m_bShift; /7AHd ;  
  CString m_Path; BPY7O  
  CString m_Number; ;KL7SM%g4  
  //}}AFX_DATA D#g -mqar:  
  // ClassWizard generated virtual function overrides E'QAsU8pP  
  //{{AFX_VIRTUAL(CCaptureDlg) 5 D|#l*V  
 public: DSrU7#  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Q dj(D\.  
 protected: wNf:_^|}  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support .a%6A#<X  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); *[Hp&6f  
  //}}AFX_VIRTUAL m%HT)`>bg  
  // Implementation e+[*4)Qfy  
 protected: Xoe|]@U`  
  HICON m_hIcon; BhJ>G%  
  // Generated message map functions VE |:k:};  
  //{{AFX_MSG(CCaptureDlg) p _gN}v  
  virtual BOOL OnInitDialog(); _{*} )&!M  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam);  0,Ds1y^  
  afx_msg void OnPaint(); b fxE}>  
  afx_msg HCURSOR OnQueryDragIcon(); q7B5#kb  
  virtual void OnCancel(); /JD}b[J$  
  afx_msg void OnAbout(); wLV,E,gM  
  afx_msg void OnBrowse(); r&u1-%%9[  
  afx_msg void OnChange(); F @PPhzZ  
 //}}AFX_MSG PucNu8   
 DECLARE_MESSAGE_MAP() QK-aH1r  
}; C;BO6$*_e  
#endif -KiPqE%&G  
i fsh(^N  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file LRJX>+@  
#include "stdafx.h" +:KZEFY?<  
#include "Capture.h" i).%GMv*r  
#include "CaptureDlg.h" V+gZjuN$  
#include <windowsx.h> AiqKf=  
#pragma comment(lib,"hook.lib") LO`0^r  
#ifdef _DEBUG 46?z*~*G  
#define new DEBUG_NEW W{,fpm  
#undef THIS_FILE Hv/C40uM-  
static char THIS_FILE[] = __FILE__; eR!# 1ar  
#endif JYdb^j2c  
#define IDM_SHELL WM_USER+1 FnGKt\  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1c$pz:$vX  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); BtJkvg(2]  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; j+jC J<  
class CAboutDlg : public CDialog j*%#~UFw  
{ CsR[@&n'  
 public: ^twyy9VR  
  CAboutDlg(); ^ D0"m>3r  
  // Dialog Data 579Q&|L.  
  //{{AFX_DATA(CAboutDlg) e,(Vy  
  enum { IDD = IDD_ABOUTBOX }; N.|F8b]v  
  //}}AFX_DATA T8 FW(Gw#  
  // ClassWizard generated virtual function overrides mR0`wrt  
  //{{AFX_VIRTUAL(CAboutDlg) (j8*F Bq  
 protected: 7K"3[.  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support z teu{0  
  //}}AFX_VIRTUAL Kw fd S(  
  // Implementation Es=G' au  
 protected: "aGmv9\  
  //{{AFX_MSG(CAboutDlg) rZUTBLZ`j  
  //}}AFX_MSG &9e  
  DECLARE_MESSAGE_MAP() v`h>5#_[  
}; d?oXz|;H(  
%JeND XbI4  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) m(f`=+lqI`  
{ dle\}Sy=  
 //{{AFX_DATA_INIT(CAboutDlg) gwaSgV$z  
 //}}AFX_DATA_INIT 4M C]s~n  
} KloX.y)q  
xW"O|x$6  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) S^s-md>  
{ Ar%*NxX  
 CDialog::DoDataExchange(pDX); M6-uTmN:d  
 //{{AFX_DATA_MAP(CAboutDlg) $QiMA,  
 //}}AFX_DATA_MAP p{E(RsA  
} eF3NyL(A  
?V`-z#y7  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 3W'fEh5  
 //{{AFX_MSG_MAP(CAboutDlg) ;MfqI/B{  
 // No message handlers |$ PA  
 //}}AFX_MSG_MAP < F5VJ  
END_MESSAGE_MAP() f1NHW|_j  
wBt7S!>G  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) rfDGS%!O%  
: CDialog(CCaptureDlg::IDD, pParent) e N`+r  
{ g$Tsht(rHD  
 //{{AFX_DATA_INIT(CCaptureDlg) .-$3I|}X=  
  m_bControl = FALSE; 4K cEJlK5  
  m_bAlt = FALSE; Q<>u) %92@  
  m_bShift = FALSE; ^!tX+`,6^  
  m_Path = _T("c:\\"); T"\d,ug5[  
  m_Number = _T("0 picture captured."); N[@~q~v  
  nCount=0; *)[fGxz \  
  bRegistered=FALSE; bU gg2iFS  
  bTray=FALSE; w5Fk#zJv  
 //}}AFX_DATA_INIT / `cy4<  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 QMMpB{FZ`o  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); qkfof{z  
} smCACQ$ (  
gj;gl ="3  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) F- kjv\  
{ j+!u=E  
 CDialog::DoDataExchange(pDX); '@t,G,FJ  
 //{{AFX_DATA_MAP(CCaptureDlg) w/NT 5  
  DDX_Control(pDX, IDC_KEY, m_Key); _;}$/  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); kQI'kL8>  
  DDX_Check(pDX, IDC_ALT, m_bAlt); %@QxU-k_  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); QFTiE1mGH  
  DDX_Text(pDX, IDC_PATH, m_Path); iv`G}.Bo  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 0d[O/Q`  
 //}}AFX_DATA_MAP #8jiz+1 _  
} I=DVMG|  
G)0 4'|W  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) /[c_,G" "  
//{{AFX_MSG_MAP(CCaptureDlg) /J}G{Y |n  
 ON_WM_SYSCOMMAND() Qi\]='C  
 ON_WM_PAINT() g_4%M0&AX  
 ON_WM_QUERYDRAGICON() x)80:A}  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) "1|g eO|  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) j&ti "|2\  
 ON_BN_CLICKED(ID_CHANGE, OnChange) )pI( <  
//}}AFX_MSG_MAP G=qlE?j`j  
END_MESSAGE_MAP() FqyxvL.  
'&Ur(axs  
BOOL CCaptureDlg::OnInitDialog() @o[ZJ4>*  
{ m 70r'b]  
 CDialog::OnInitDialog(); Q'U!  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); gZHgL7@  
 ASSERT(IDM_ABOUTBOX < 0xF000); $\/i t  
 CMenu* pSysMenu = GetSystemMenu(FALSE); +PPQ"#1pS  
 if (pSysMenu != NULL) pI f6RwH}%  
 { T Tbe{nb  
  CString strAboutMenu; @Mg&T$  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ](I||JJa9f  
  if (!strAboutMenu.IsEmpty()) G{?`4=K  
  { 0%xb):Ctw  
   pSysMenu->AppendMenu(MF_SEPARATOR); ")ys!V9  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); dLqBu~*  
  } @oY+b!L  
 } NvzPZ9=@-  
 SetIcon(m_hIcon, TRUE); // Set big icon &fRz6Hd  
 SetIcon(m_hIcon, FALSE); // Set small icon  U :x;4  
 m_Key.SetCurSel(0); NxJnU<g-  
 RegisterHotkey(); h_-4Q"fb(  
 CMenu* pMenu=GetSystemMenu(FALSE); FVNTE +LW  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); S/Ic=  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ebEI%8p g  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); .3) 27Cjw  
 return TRUE; // return TRUE unless you set the focus to a control \e'Vsy>q  
} (Jb#'(~a  
Ot.v%D`e 5  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) g mWwlkf9  
{ = y^5PjN  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) o(}%b8 K  
 { C D6N8n]  
  CAboutDlg dlgAbout; z,ryY'ua/I  
  dlgAbout.DoModal(); &qY]W=9uK  
 } F<h+d917  
 else {$t*XTY6R  
 { %1 RWF6  
  CDialog::OnSysCommand(nID, lParam); [PXq<ST  
 } |WUM=g7PC  
} OL_#Uu  
h [Sd3Z*  
void CCaptureDlg::OnPaint() iWWtL  
{ 6RIbsy  
 if (IsIconic()) L~/L<Ms  
 { `]]5!U2  
  CPaintDC dc(this); // device context for painting =84EX<B  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); #Fo#f<b p  
  // Center icon in client rectangle mUl0D0#  
  int cxIcon = GetSystemMetrics(SM_CXICON); f>xi (0  
  int cyIcon = GetSystemMetrics(SM_CYICON); ;HYEJ3  
  CRect rect; IAbQgBvUD  
  GetClientRect(&rect); >r X$E<B\  
  int x = (rect.Width() - cxIcon + 1) / 2; .[eC w  
  int y = (rect.Height() - cyIcon + 1) / 2; s;Bh69  
  // Draw the icon ]'n4e*  
  dc.DrawIcon(x, y, m_hIcon); YeT{<9p  
 } K%`]HW@I{  
 else C ]B P}MY<  
 { qh W]Wd" g  
  CDialog::OnPaint(); \{Q_\s&)  
 } Z[&FIG% tV  
} 7f3,czW  
4n.JRR&;  
HCURSOR CCaptureDlg::OnQueryDragIcon() Kt qOA[6  
{ ;t9!< L  
 return (HCURSOR) m_hIcon; UM0Ws|qx&  
} 0N)DHD?U  
Y>C0 5?>  
void CCaptureDlg::OnCancel() 9%21Q>Y?b  
{ g :B4zlKG  
 if(bTray) k8J zey]X  
  DeleteIcon(); oM>UIDCY_v  
  CDialog::OnCancel(); AMB{Fssz  
} sWse (_2  
 mVS^HQ:  
void CCaptureDlg::OnAbout() y5c\\e  
{ ,%A|:T]  
 CAboutDlg dlg; #mJRL[V5^  
 dlg.DoModal(); t@R n#(~"  
} \7h>9}wGf  
A#K<5%U{Mv  
void CCaptureDlg::OnBrowse() J9t?;3  
{ *otgI"y\  
 CString str; H;<>uE Lie  
 BROWSEINFO bi; `z q+Xl  
 char name[MAX_PATH]; z{ M2tLNb  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); K2Ro0  
 bi.hwndOwner=GetSafeHwnd(); D=%1?8K  
 bi.pszDisplayName=name;  %nUN  
 bi.lpszTitle="Select folder"; y5*zyd  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ]8"U)fzmc.  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); }'}n~cA.{  
 if(idl==NULL) aeNbZpFQ  
  return; c zT2f  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); o+8H:7,o'  
 str.ReleaseBuffer(); 4P5^.\.  
 m_Path=str; vP#*if[V5  
 if(str.GetAt(str.GetLength()-1)!='\\') B R  
  m_Path+="\\"; 4 7mT  
 UpdateData(FALSE); ZXo;E  
} / ~".GZ&29  
<-' !I&  
void CCaptureDlg::SaveBmp() s8's(*]  
{ )2l @%?9  
 CDC dc; Y j bp:  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ,) dlL tUm  
 CBitmap bm; /zXOta G  
 int Width=GetSystemMetrics(SM_CXSCREEN); IIT[^_g  
 int Height=GetSystemMetrics(SM_CYSCREEN); 6`6 / 2C$%  
 bm.CreateCompatibleBitmap(&dc,Width,Height); NNr6~m)3v  
 CDC tdc; i?b9zn  
 tdc.CreateCompatibleDC(&dc); b{aB^a:f=L  
 CBitmap*pOld=tdc.SelectObject(&bm); 04}8x[t  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); )\D{5j  
 tdc.SelectObject(pOld); 2[(~_VJ  
 BITMAP btm; WK?5`|1l:x  
 bm.GetBitmap(&btm); 3O-vO=D  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; nql9SQ'\\  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); j `!Ge  
 BITMAPINFOHEADER bih; K/Pw;{}  
 bih.biBitCount=btm.bmBitsPixel; F7j/Zuj  
 bih.biClrImportant=0; tw.GBR  
 bih.biClrUsed=0; *aS+XnT/  
 bih.biCompression=0; jTg~]PQ^  
 bih.biHeight=btm.bmHeight; 5_](N$$  
 bih.biPlanes=1; d^M*%az  
 bih.biSize=sizeof(BITMAPINFOHEADER); 1anh@T.  
 bih.biSizeImage=size; 479X5Cl  
 bih.biWidth=btm.bmWidth; M?My+ oT  
 bih.biXPelsPerMeter=0; 2 z#S| $  
 bih.biYPelsPerMeter=0; .hG*mXw>  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); )qMbk7:v\  
 static int filecount=0; opm_|0  
 CString name; jDQ?b\^  
 name.Format("pict%04d.bmp",filecount++); EFx>Hu/ [G  
 name=m_Path+name; 'nM4t  
 BITMAPFILEHEADER bfh; Ye$j43b  
 bfh.bfReserved1=bfh.bfReserved2=0; sCt)Yp+8}B  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 9M($_2,44  
 bfh.bfSize=54+size; :2M&C+f[  
 bfh.bfOffBits=54; O9>$(`@I  
 CFile bf; '@@!lV  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ $+n6V2^K)7  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); `) cH(Rj  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ^dk$6%0  
  bf.WriteHuge(lpData,size); u_+iH$zA  
  bf.Close(); u;t~ z  
  nCount++; Z|x|8 !D  
 } ,m]5j_< }  
 GlobalFreePtr(lpData); Bf #cBI  
 if(nCount==1) }Md;=_TP  
  m_Number.Format("%d picture captured.",nCount); -@_v@]:  
 else Q 318a0  
  m_Number.Format("%d pictures captured.",nCount); e Bxm  
  UpdateData(FALSE); 1|"BpX~D  
} x$o^;2Z  
bFajK;  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ILAn2W  
{ 2IM 31 .  
 if(pMsg -> message == WM_KEYDOWN) 7p]Izx8][  
 { U'9z.2"}9  
  if(pMsg -> wParam == VK_ESCAPE) q!'p   
   return TRUE; _ h#I}uJ~  
  if(pMsg -> wParam == VK_RETURN) TvDC4tm-:  
   return TRUE; 3Ji$igL  
 } g6lWc@]F  
 return CDialog::PreTranslateMessage(pMsg); AnX<\7bc}  
} ZfqN4  
6MY<6t0a  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) hchG\ i  
{ m#8[")a$"  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 7XyCl&Dc:  
  SaveBmp(); X|Y(*$?D7  
  return FALSE; Ky%lu^  
} 9-{=m+|b  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ o.fqJfpj  
 CMenu pop; ,I5SAd|dX  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); EV{Ys}3M  
 CMenu*pMenu=pop.GetSubMenu(0); (oX!D(OI  
 pMenu->SetDefaultItem(ID_EXITICON); =(7nl#o  
 CPoint pt; njX$?V   
 GetCursorPos(&pt); !*"fWahv  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); aif;h! ?y  
 if(id==ID_EXITICON) /A-WI x  
  DeleteIcon(); : (X3?%  
 else if(id==ID_EXIT) "EMW'>&m  
  OnCancel(); -c0ypz  
 return FALSE; 7>j~;p{  
} 5a_8`csu  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); PgK7CG7G  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) y-bUVw!Y  
 AddIcon(); :[_ms d  
 return res; 1 rhZlmf[r  
} "t.` /4R2w  
q {Z#}|km#  
void CCaptureDlg::AddIcon() < z2wt  
{ A)C)5W  
 NOTIFYICONDATA data; @lE'D":?  
 data.cbSize=sizeof(NOTIFYICONDATA); / }$n_N\!)  
 CString tip; |0=UZK7%O  
 tip.LoadString(IDS_ICONTIP); +K'Hr: (  
 data.hIcon=GetIcon(0); sNo8o1Hby  
 data.hWnd=GetSafeHwnd(); i}DS+~8v  
 strcpy(data.szTip,tip); [A,^ F0:h  
 data.uCallbackMessage=IDM_SHELL; @pYEzizP7  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; iI IXv  
 data.uID=98; 'v V7@@  
 Shell_NotifyIcon(NIM_ADD,&data); pCh v;  
 ShowWindow(SW_HIDE); Wvr{l  
 bTray=TRUE; + tMf&BZ  
} \$w kr  
P7.bn  
void CCaptureDlg::DeleteIcon() &R%'s1]o  
{ ,?|$DY+=  
 NOTIFYICONDATA data; OA[e}Vn  
 data.cbSize=sizeof(NOTIFYICONDATA); ] c7X~y  
 data.hWnd=GetSafeHwnd(); g5@g_~ g  
 data.uID=98; GcdJf/k  
 Shell_NotifyIcon(NIM_DELETE,&data); 2Ckx.m&  
 ShowWindow(SW_SHOW); H TOr  
 SetForegroundWindow(); &2`p#riAS  
 ShowWindow(SW_SHOWNORMAL); (\{k-2t*^  
 bTray=FALSE; 3@gsKtA&H4  
} V|_ h[hXE  
O[C4xq  
void CCaptureDlg::OnChange() ^E.L8  
{ !o /=,ZIx  
 RegisterHotkey(); 1Hr}n6s  
} 22CET9iCe  
kJ_8|  
BOOL CCaptureDlg::RegisterHotkey() ~_D.&-xUF  
{ k9;^|Cm k  
 UpdateData(); c;$ 4}U4  
 UCHAR mask=0; aZWj52  
 UCHAR key=0; _?I{>:!|  
 if(m_bControl) cl%+m  
  mask|=4; C}RO'_Pq  
 if(m_bAlt) H3D<"4Q>  
  mask|=2; h= sNj  
 if(m_bShift) qcj {rG18  
  mask|=1; -d\sKc  
  key=Key_Table[m_Key.GetCurSel()]; "r-P[EKpL  
 if(bRegistered){ :u14_^  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); \#_ymM0  
  bRegistered=FALSE; gYB!KM *v  
 } W[\6h Zv  
 cMask=mask; G@k]rwub  
 cKey=key;  oBkhb  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); At iUTA  
 return bRegistered; !@=S,Vc.  
} *5%vU|9b  
nF,F#V8l  
  四、小结 $eYL|?P50h  
KC6Cg?y^  
  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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