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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: IcmTF #{D  
  K ZoIjK]  
  一、实现方法 MH@=Qqx#=t  
<,!8xp7,~  
  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: r4&g~+ck  
pu#h:nb>88  
#pragma data_seg("shareddata") | a001_Wv  
HHOOK hHook =NULL; //钩子句柄 50r3Kl0  
UINT nHookCount =0; //挂接的程序数目 vN#?>aL  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 0#1hkJ"  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 M)4-eo  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ~q]@Jp  
static int KeyCount =0; _9yb5_  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1  v?Dc3  
#pragma data_seg() FYPv:k   
dr3j<D-Q  
  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。 x(oL\I_Z  
to9~l"n.s  
  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: !p$HS0c  
P^9y0Q  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR BG ,ln(Vz  
cKey,UCHAR cMask) 6S]K@C=r  
{ pG"pvfEl9f  
 BOOL bAdded=FALSE; <u "xHl8Io  
 for(int index=0;index<MAX_KEY;index++){ 4<%(Y-_sF  
  if(hCallWnd[index]==0){ .. jc^'L  
   hCallWnd[index]=hWnd; cbe&SxJ  
   HotKey[index]=cKey; r7B.@+QK  
   HotKeyMask[index]=cMask; ToMvP B);  
   bAdded=TRUE; ,Dh+-}  
   KeyCount++; 0,a/t jSr  
   break; =VA5!-6<Uq  
  } rl:6N*kK  
 } $D;/b+a  
 return bAdded; n^}M*#  
} a'zXLlXgGd  
//删除热键 @4sEHk 3  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) R<\5 q%@G  
{ Q\H1=8  
 BOOL bRemoved=FALSE; '7BJ.  
 for(int index=0;index<MAX_KEY;index++){ /hrVnki*  
  if(hCallWnd[index]==hWnd){ *[XVkt`H  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ _#f+@)vR  
    hCallWnd[index]=NULL; `)i'1E[9  
    HotKey[index]=0; 2=R}u-@6p  
    HotKeyMask[index]=0; W=QT-4  
    bRemoved=TRUE; S  ^5EG;[  
    KeyCount--; Ug}dw a  
    break; Sr$&]R]^  
   } -@*[   
  } >.sdLA Si  
 } *=yUs'brB  
 return bRemoved; |:qaF  
} Tt^PiaS!  
o 8fB  
XFj\H(D  
  DLL中的钩子函数如下:  3)D'Yx  
o`tOnwt  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) I`e$U  
{ aC!e#(q  
 BOOL bProcessed=FALSE; BH`%3Mw  
 if(HC_ACTION==nCode) 4k$i:st;  
 { ;dC>$_P?  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 0cGO*G2Xr  
   switch(wParam) `5SLo=~  
   {  i sK_t*  
    case VK_MENU: fRcs@yZnS  
     MaskBits&=~ALTBIT; f&=WgITa  
     break; ZnrsJ1f:  
    case VK_CONTROL: p?@R0]  
     MaskBits&=~CTRLBIT; &- 5`Oln  
     break; *s=jKV#  
    case VK_SHIFT: G 51l_  
     MaskBits&=~SHIFTBIT; XIep3l*  
     break; eT!*_.' e  
    default: //judge the key and send message DHI%R<  
     break; )Z/L  
   } zcqv0lM '  
   for(int index=0;index<MAX_KEY;index++){ Q4;%[7LU  
    if(hCallWnd[index]==NULL) T O]wD^`  
     continue; OV~]-5gau  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) tVUC@M>'  
    { < bvbfS  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 4z;@1nN_8a  
     bProcessed=TRUE; \zx &5a #  
    } ~]w|ULNa3|  
   } _ ^2\/@  
  } # dA-dN  
  else if((lParam&0xc000ffff)==1){ //有键按下 o$4i{BL  
   switch(wParam) {4C/ZA{|l  
   { cr wui8  
    case VK_MENU: sY- ] Q  
     MaskBits|=ALTBIT; T"bH{|:%*=  
     break; :m&cm%W]ts  
    case VK_CONTROL: w4AA4u  
     MaskBits|=CTRLBIT; z+5ZUS2~&  
     break; 1H-d<G0)  
    case VK_SHIFT: 1(YEOZ  
     MaskBits|=SHIFTBIT; B=<Z@u  
     break; yIq. m=  
    default: //judge the key and send message #/,WgsAC  
     break; v1j&oA}$.  
   } :>q*#vlb  
   for(int index=0;index<MAX_KEY;index++){ _\ &N<  
    if(hCallWnd[index]==NULL) K*/X{3J;  
     continue; <i$ud&D  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ):L ; P)  
    { Cu $mb}@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); [Yyb)Qf  
     bProcessed=TRUE; 2uEvu  
    } ;1MRBk,  
   } +7V4mF!u  
  } \UEO$~Km  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 vmGGdj5aI  
   for(int index=0;index<MAX_KEY;index++){ vU9j|z  
    if(hCallWnd[index]==NULL) RG8Ek"D@  
     continue; $&ZN%o3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) -tH^Deo  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); n7p,{KSQ  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 #wS/QrRE  
   } v?L`aj1ox  
  } \1MMz Z4rf  
 } V"u .u  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 3*C|"|lJ  
} 7Ap==J{a  
xV\mS+#  
  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: 50R&;+b  
O?OG`{k  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); U?e.)G  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); $v\o14 v  
!?aL_{7J  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:  K?]c  
@x[Arx^?}  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) :$f9(f&  
{ nsjrzO79L8  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) nl/~7({  
 { n:P++^ j  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Ap)pOD7  
  SaveBmp(); =}1m.  
  return FALSE; OaF[t*]D3  
 } s;Sv@=\  
 …… //其它处理及默认处理 EHlkt,h*  
} W&s@2y?rF  
wqE+hKs,  
_!C M  
  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。 (> VD#n  
5tUN'KEbN  
  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。 ,xOOR   
2od 9Q=v~  
  二、编程步骤 vD91t/_+  
~ \3j{pr  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; 8-geBlCE,  
&<$YR~g5j$  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; e .(  
iji2gWV}h  
  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; TO]7%aB  
9~|hGo  
  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; PCX X[N  
h 7  c  
  5、 添加代码,编译运行程序。 .[:2M9Rx  
bKac?y~S_  
三、程序代码 U6Xi-@XP  
#7BX,jvn>  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL \ ~uY);  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) \agT#tT J  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ h/xV;oj  
#if _MSC_VER > 1000 Kn`-5{1B|  
#pragma once 586lN22xM  
#endif // _MSC_VER > 1000 q6AL}9]9  
#ifndef __AFXWIN_H__ t +h}hL  
#error include 'stdafx.h' before including this file for PCH <d] t{M62W  
#endif m-AW}1:\f  
#include "resource.h" // main symbols 9^2l<4^Z  
class CHookApp : public CWinApp ZB'ms[  
{ S*Hv2sl  
 public: $(N+E,XB  
  CHookApp(); wdLlQD  
  // Overrides cIB[D.  
  // ClassWizard generated virtual function overrides <-s5 ;xwtS  
  //{{AFX_VIRTUAL(CHookApp) D]*<J"/]d  
 public: q 7aH=dhw  
  virtual BOOL InitInstance(); $e/[!3CASP  
  virtual int ExitInstance(); kx6-8j3gD7  
  //}}AFX_VIRTUAL /;V:<mekf  
  //{{AFX_MSG(CHookApp) GSaU:A  
  // NOTE - the ClassWizard will add and remove member functions here. ~(Xzm  
  // DO NOT EDIT what you see in these blocks of generated code ! V:>ZSW4,^  
  //}}AFX_MSG bc%N !d  
  DECLARE_MESSAGE_MAP() c?7 Wjy  
}; OqlP_^Zz7p  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); BQF7S<O+  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "iPX>{'En  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); r~Vb*~U"  
BOOL InitHotkey(); b X'.hHR  
BOOL UnInit(); "[Hn G(gA  
#endif x2.YEuSMC  
yl UkVr   
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. }e8u p*#me  
#include "stdafx.h" l<dtc[  
#include "hook.h" JzZ@Z8%a;  
#include <windowsx.h> {-.ZFUZmT  
#ifdef _DEBUG &!0%"4  
#define new DEBUG_NEW ZK$<"z6{  
#undef THIS_FILE bP HtP\)  
static char THIS_FILE[] = __FILE__; ~F^7L5d}C  
#endif BaXf=RsZ  
#define MAX_KEY 100 =P7!6V\f  
#define CTRLBIT 0x04 [;,Xp/  
#define ALTBIT 0x02 gkMyo`  
#define SHIFTBIT 0x01 /4 %ycr6  
#pragma data_seg("shareddata") @zq]vX-A_  
HHOOK hHook =NULL; 2NvbQ 3c5  
UINT nHookCount =0; W*.6'u)9  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey s%Irh;Bs  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 344E4F"ph  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ~pG,|\9  
static int KeyCount =0; o@@, }  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift %}1v-z  
#pragma data_seg() 4#Id0['  
HINSTANCE hins; jQ&82X%m  
void VerifyWindow(); U^ Ulj/%6  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) `2PvE4]%p  
//{{AFX_MSG_MAP(CHookApp) M#o'hc  
// NOTE - the ClassWizard will add and remove mapping macros here. :~4 M9  
// DO NOT EDIT what you see in these blocks of generated code! .xV^%e?H  
//}}AFX_MSG_MAP 3.E3}Jz`  
END_MESSAGE_MAP() 2Wp)CI<\D  
g#s hd~e  
CHookApp::CHookApp() z=pGu_`2  
{ JH`oa1 b  
 // TODO: add construction code here, < +X,oxg  
 // Place all significant initialization in InitInstance wgFAPZr  
} 29kR7[k  
w3Z;&sFd  
CHookApp theApp; P{%R*hb]  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) )9s 6(Iu  
{ kcio]@#  
 BOOL bProcessed=FALSE; (hn;C>B  
 if(HC_ACTION==nCode) PCZ%<>v  
 { i;I!Jc_b'  
  if((lParam&0xc0000000)==0xc0000000){// Key up hjx= ?  
   switch(wParam) ~%d*#Yxq  
   { EB2 5N~7  
    case VK_MENU: v/z~ j  
     MaskBits&=~ALTBIT; *7UDTgY  
     break; -I*NS6  
    case VK_CONTROL: %h "%G=:  
     MaskBits&=~CTRLBIT; Y2>0Y3yM  
     break; e%EE|  
    case VK_SHIFT: IZ 3e:  
     MaskBits&=~SHIFTBIT; zelM}/d  
     break; ;|AyP  
    default: //judge the key and send message B~7]x;8h  
     break; WeE1 \  
   } X\HP&;Wd  
   for(int index=0;index<MAX_KEY;index++){ M.0N`NmS  
    if(hCallWnd[index]==NULL) SPo}!&p$~  
     continue; P2=u-{?~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ew 4pAav  
    { ,;~@t:!c  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); w i=&W  
     bProcessed=TRUE; 1qd(3A41  
    } xY$@^(Q\  
   } Zt"3g6S  
  } YT\.${N  
  else if((lParam&0xc000ffff)==1){ //Key down r"W,G /;h  
   switch(wParam) aa,^+^J  
   { dO|n[/qL0  
    case VK_MENU: |nT+ W| 0U  
     MaskBits|=ALTBIT; #1<Jwt+  
     break; IfzZ\x .  
    case VK_CONTROL: -cs$E2 -  
     MaskBits|=CTRLBIT; D,&o=EU  
     break; Zg/ ],/`  
    case VK_SHIFT: z%44@TP  
     MaskBits|=SHIFTBIT; Dio9'&DtC  
     break; X}G3>HcP  
    default: //judge the key and send message ,<O|Iis  
     break; K~Z$NS^W&  
   } ;b;Bl:%?  
   for(int index=0;index<MAX_KEY;index++) Zil<*(kv{  
   { vd#BT$d?  
    if(hCallWnd[index]==NULL) `| f1^C^  
     continue; $.T\dm-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) }-2U,Xg[  
    { [s&0O<Wv  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); j5V{,lf  
     bProcessed=TRUE; WdJJt2'  
    } r>Cv@4/j  
   } . E? a  
  } Fd1jElt  
  if(!bProcessed){ L]#b =Y  
   for(int index=0;index<MAX_KEY;index++){ 9MUg/  
    if(hCallWnd[index]==NULL) p n(y4we  
     continue; 4StoEgFS  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ;$/]6@bqB  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); mWX{I2  
   } qz&?zzz;  
  } u?lbC9}$  
 } 5 ]l8l+  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); TpAso[r  
} ~Zo;LSI  
@JU Xp  
BOOL InitHotkey() prO ~g  
{ IUSV\X9  
 if(hHook!=NULL){ j+NsNIJq  
  nHookCount++; `!lQd}W  
  return TRUE; 'A)9h7k}  
 } LQXMGgp  
 else yL"UBe}v  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); +!eh\.u|]  
  if(hHook!=NULL) ;kR+jC(  
   nHookCount++; pz,iQUs _o  
  return (hHook!=NULL); ?C*}NM  
}  wjfc9z  
BOOL UnInit() VX]Ud\(  
{ -E>LB\[t)  
 if(nHookCount>1){ `tH :oP0=  
  nHookCount--; A!IZIT5)m  
  return TRUE; zr^"zcfz&  
 } <P0&!yN  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ?eOw8Rom  
 if(unhooked==TRUE){ Fb<fQIa  
  nHookCount=0; gRg8D{  
  hHook=NULL; Q 1[E iM3  
 } =H/ 5  
 return unhooked; Y?xc#'  
} UIK4]cYC'  
iPdR;O'  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "V{v*Aei0  
{ cn2SMa[@S  
 BOOL bAdded=FALSE; (R-(  
 for(int index=0;index<MAX_KEY;index++){ h4N&Yb fo  
  if(hCallWnd[index]==0){ ~en'E  
   hCallWnd[index]=hWnd; >\'gIIs  
   HotKey[index]=cKey; U)] }EgpF  
   HotKeyMask[index]=cMask; DQ hstXX  
   bAdded=TRUE; zCI.^^<?  
   KeyCount++; @ GXi{9  
   break; ujh`&GiB+  
  } !;M5.Y1j&"  
 } wH]Y1 m  
 return bAdded; 6@-O#,]J  
} LZ z]4Mf  
,QPo%{:p  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ChRCsu~  
{ O ~D]C  
 BOOL bRemoved=FALSE; grTwo  
 for(int index=0;index<MAX_KEY;index++){ y@9ifFr  
  if(hCallWnd[index]==hWnd){ Nc:0opPM  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ n |Q' >  
    hCallWnd[index]=NULL; w 3$9  
    HotKey[index]=0; J8?V1Ad{  
    HotKeyMask[index]=0; jq( QL%)_O  
    bRemoved=TRUE; wPl9%  
    KeyCount--; Tno 0Q +  
    break; B~47mw&b  
   } A+ LX37B  
  } h]DzX8r}  
 } -~ H?R  
 return bRemoved; {C5-M!D{<  
} #D .hZ=!  
CSlPrx2\  
void VerifyWindow() |Pq z0n=v  
{ ]:svR@E  
 for(int i=0;i<MAX_KEY;i++){ O7z5,-  
  if(hCallWnd!=NULL){ {9XQ~t"m^  
   if(!IsWindow(hCallWnd)){ H&uh$y@  
    hCallWnd=NULL; f J+  
    HotKey=0; (x140_TH~  
    HotKeyMask=0; SY$%)(c8kL  
    KeyCount--; %OJq(}  
   } MQq!<?/  
  } 2 sK\.yS  
 } <8BNqbX  
} %:yVjb,Yf  
Jp-6]uW  
BOOL CHookApp::InitInstance() dyVfDF  
{ ?b xa k  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); >;+q,U}  
 hins=AfxGetInstanceHandle(); ] D+'Ao^'  
 InitHotkey(); `ZGKM>q`  
 return CWinApp::InitInstance(); a\tv,Lx  
} WP >VQZ&  
t(Gg 1  
int CHookApp::ExitInstance() n..R'vNj  
{ !'*1;OQ  
 VerifyWindow(); 3Uy(d,N  
 UnInit(); z?  Ck9  
 return CWinApp::ExitInstance(); qL~|bfN  
} ZG8Xr "  
b}J,&eYD  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Ue(\-b\)  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) #Q$+AdY|  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ zj 2l&)N  
#if _MSC_VER > 1000 .4XX )f5  
#pragma once l(d3N4iz  
#endif // _MSC_VER > 1000 #A=ER[[  
hE;BT>_dn  
class CCaptureDlg : public CDialog G-5ezVli  
{ `Hd~H  
 // Construction $fG~;`T  
 public: 4nKlW_{,  
  BOOL bTray; o "1X8v  
  BOOL bRegistered; WT jy"p*  
  BOOL RegisterHotkey(); g[(Eh?]Sc  
  UCHAR cKey; *Qy,?2  
  UCHAR cMask; aRcVoOq  
  void DeleteIcon(); 0gH;y+\=*  
  void AddIcon(); e@{Rlz   
  UINT nCount; Y?\PU{ O  
  void SaveBmp(); Un Ocw  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor K[l5=)G0L  
  // Dialog Data MY l9 &8  
  //{{AFX_DATA(CCaptureDlg)  mT,#"k8  
  enum { IDD = IDD_CAPTURE_DIALOG }; t(p}0}Pp  
  CComboBox m_Key; V z-]H]MW,  
  BOOL m_bControl; n a+P|'6  
  BOOL m_bAlt; }s:~E2?In  
  BOOL m_bShift; eDY)i9"W  
  CString m_Path; G#j~8`3X  
  CString m_Number; 'mk_s4J  
  //}}AFX_DATA $y,tR.5.)[  
  // ClassWizard generated virtual function overrides |f2 bb  
  //{{AFX_VIRTUAL(CCaptureDlg) LL+PAvMg  
 public: UeU`U  
  virtual BOOL PreTranslateMessage(MSG* pMsg); f47dB_{5f.  
 protected: R7/ET"  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support - *v)sP"@  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); q,>4#J[2;s  
  //}}AFX_VIRTUAL @bZ,)R  
  // Implementation @|<qTci  
 protected: _&aPF/  
  HICON m_hIcon; h6Cqc}P  
  // Generated message map functions .zsY VtK  
  //{{AFX_MSG(CCaptureDlg) +!$]a^3l  
  virtual BOOL OnInitDialog(); "~L$oji  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); dz1kQzOU*  
  afx_msg void OnPaint(); O3tw@ &k  
  afx_msg HCURSOR OnQueryDragIcon(); id [caP=`  
  virtual void OnCancel(); f7:}t+d  
  afx_msg void OnAbout(); ;lf$)3%[  
  afx_msg void OnBrowse(); q_Z6s5O  
  afx_msg void OnChange(); Z6 E_Y?  
 //}}AFX_MSG kY{;(b3Q  
 DECLARE_MESSAGE_MAP() KO[,C[;|j  
}; 2b&Fu\2Dmv  
#endif HNd? '  
;e$YM;;d  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Yb4%W-5  
#include "stdafx.h" xB5QM #w\  
#include "Capture.h" u,./,:O%=  
#include "CaptureDlg.h" #@J{ )  
#include <windowsx.h> $'3'[Nr(;t  
#pragma comment(lib,"hook.lib") v(p<88.!m  
#ifdef _DEBUG A~H@0>1  
#define new DEBUG_NEW }!N/?A5  
#undef THIS_FILE C4)m4r%  
static char THIS_FILE[] = __FILE__; ;*cCaB0u  
#endif FT\%=>{  
#define IDM_SHELL WM_USER+1 #]r'?GN  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); U\-=|gQ'  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); D+y?KihE  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; J@+b_e*  
class CAboutDlg : public CDialog +mC?.B2D  
{ DA>TT~L  
 public: v {) 8QF]  
  CAboutDlg(); CI=M0  
  // Dialog Data ^.c<b_(=h  
  //{{AFX_DATA(CAboutDlg) *gOUpbtXa  
  enum { IDD = IDD_ABOUTBOX }; WWT1_&0  
  //}}AFX_DATA N 1hj[G[H"  
  // ClassWizard generated virtual function overrides =k5O*ql"  
  //{{AFX_VIRTUAL(CAboutDlg) lYS*{i1^ '  
 protected: yw >Frb5p  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Ho1V)T>  
  //}}AFX_VIRTUAL ANTWWs}  
  // Implementation 7m8(8$-6  
 protected: eV j7%9  
  //{{AFX_MSG(CAboutDlg) 6eb~Z6n&?  
  //}}AFX_MSG fJ&\Z9zY  
  DECLARE_MESSAGE_MAP() CW -[c  
}; F<DXPToX%  
O]KQ]zN  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) EAlLxXDDh  
{ XrI$@e*  
 //{{AFX_DATA_INIT(CAboutDlg) ~~q>]4>  
 //}}AFX_DATA_INIT 38GZ_ z}r  
} s7,D}Zz  
._q<~_~R  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 0cq<!{d  
{ &r2\P6J  
 CDialog::DoDataExchange(pDX); 73JrK_h  
 //{{AFX_DATA_MAP(CAboutDlg) tac\Ki?  
 //}}AFX_DATA_MAP 49YN@ PXC  
} mJYD"WgY  
#I\" 'n5M  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) V3ExS1fNf  
 //{{AFX_MSG_MAP(CAboutDlg) <==6fc>s  
 // No message handlers gBOF#"-  
 //}}AFX_MSG_MAP Hyi'z1  
END_MESSAGE_MAP() odn3*{c{x  
'V\V=yc1  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) %e:[[yq)G  
: CDialog(CCaptureDlg::IDD, pParent) 0~ o,^AW  
{ e m  
 //{{AFX_DATA_INIT(CCaptureDlg) bnJ4Edy  
  m_bControl = FALSE; 6Ad=#MM  
  m_bAlt = FALSE; L%+mD$@u  
  m_bShift = FALSE; G&08Qb ,N  
  m_Path = _T("c:\\"); ZEso2|   
  m_Number = _T("0 picture captured."); Hwcmt!y  
  nCount=0; J,\e@  
  bRegistered=FALSE; FH%M5RD  
  bTray=FALSE; z\$(@:{A  
 //}}AFX_DATA_INIT )y{:Uc\4!  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 tG~[E,/`  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); #Hy\l J  
} <h~=d("j  
/ }*}r  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) u:^sEk"Lk'  
{ <GF^VT|Ce  
 CDialog::DoDataExchange(pDX); !t}yoN n|  
 //{{AFX_DATA_MAP(CCaptureDlg) Z\cD98B#  
  DDX_Control(pDX, IDC_KEY, m_Key); ]r'D  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); M3r;Pdj2r  
  DDX_Check(pDX, IDC_ALT, m_bAlt); VOIni<9y  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Cj$:TWYIh[  
  DDX_Text(pDX, IDC_PATH, m_Path); TFAR>8Nm  
  DDX_Text(pDX, IDC_NUMBER, m_Number); VfozqUf  
 //}}AFX_DATA_MAP Wb[k2V  
} ("{"8   
wB&5q!{!  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Q>71uM%e`  
//{{AFX_MSG_MAP(CCaptureDlg) BGHZL~  
 ON_WM_SYSCOMMAND() h1l%\3ZH  
 ON_WM_PAINT() SM8_C!h:  
 ON_WM_QUERYDRAGICON() >GLoeCRNu  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) cICf V,j  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) <@Vf:`a!P>  
 ON_BN_CLICKED(ID_CHANGE, OnChange) J4@-?xj=\q  
//}}AFX_MSG_MAP zQ#* O'-n  
END_MESSAGE_MAP() =- ,'LOE  
=T\=,B  
BOOL CCaptureDlg::OnInitDialog() }kP<zvAaw  
{ (][-()YV  
 CDialog::OnInitDialog(); x=+>J$~Pb  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); +(y 8q  
 ASSERT(IDM_ABOUTBOX < 0xF000); tG ZMIG_  
 CMenu* pSysMenu = GetSystemMenu(FALSE); v\_\bT1  
 if (pSysMenu != NULL) mxpj<^n}  
 { q;UGiB^(A  
  CString strAboutMenu; yDWBrN._  
  strAboutMenu.LoadString(IDS_ABOUTBOX); #sxv?r  
  if (!strAboutMenu.IsEmpty()) { {:Fs  
  { %ZX9YuXQ  
   pSysMenu->AppendMenu(MF_SEPARATOR); a=`] L`|N  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); /0$fYrg>J  
  } r?!:%L  
 } BC\W`K  
 SetIcon(m_hIcon, TRUE); // Set big icon "eqzn KT%u  
 SetIcon(m_hIcon, FALSE); // Set small icon 'GT^araz  
 m_Key.SetCurSel(0); '#=0q  
 RegisterHotkey(); *,IK4F6>:  
 CMenu* pMenu=GetSystemMenu(FALSE); - Ry+WS=  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ;<_a ,5\Q  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); )(_NFpM  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); -e_o p'`  
 return TRUE; // return TRUE unless you set the focus to a control Js vdC]+  
} `( w"{8laB  
lcy<taNu)  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) j9l32<h7]  
{ 3 ^K#\*P  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Ga-cto1Y  
 { cpALs1j:  
  CAboutDlg dlgAbout; LrT EF j  
  dlgAbout.DoModal(); \P")Eh =d  
 } V)l:fUm2  
 else [`s0 L#  
 { j--byk6PB  
  CDialog::OnSysCommand(nID, lParam); 6B|i-b $~  
 } :`Ut.E~.  
} _>rM[\|X  
j/fniyJ)  
void CCaptureDlg::OnPaint() %ek0NBE7  
{ fGqX dlP  
 if (IsIconic()) AI|+*amTd  
 { p$qk\efv*4  
  CPaintDC dc(this); // device context for painting W`NF40)  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); <oV[[wl  
  // Center icon in client rectangle i q oXku  
  int cxIcon = GetSystemMetrics(SM_CXICON); bX,#z,  
  int cyIcon = GetSystemMetrics(SM_CYICON); (CY D]n  
  CRect rect; ZWo~!Z[Y  
  GetClientRect(&rect); k54\H.  
  int x = (rect.Width() - cxIcon + 1) / 2; `-OzjbM  
  int y = (rect.Height() - cyIcon + 1) / 2; Ff(};$/& W  
  // Draw the icon vSC1n8 /  
  dc.DrawIcon(x, y, m_hIcon); \"))P1  
 } `GdH ,:S>  
 else *YL86R+U  
 { '4<o&b^yQ  
  CDialog::OnPaint(); %ut 8/T  
 } q7f`:P9~  
} ft1#f@b.  
"lLh#W1d  
HCURSOR CCaptureDlg::OnQueryDragIcon() n6+h;+8;]  
{ T!ZjgCY}  
 return (HCURSOR) m_hIcon;  WZY+c  
} (RV#piM  
>}%#s`3W1_  
void CCaptureDlg::OnCancel() AvB=/p@]  
{ IZ7o6Etti  
 if(bTray) {sGEopd8]q  
  DeleteIcon(); F8"J<VJ7  
  CDialog::OnCancel(); Q?1J<(oq9  
} 7C 0xKF  
!%ju.Xs8  
void CCaptureDlg::OnAbout() E;{RNf|  
{ m*A b<$y  
 CAboutDlg dlg; PA ?2K4  
 dlg.DoModal(); ^4+NPk  
} z k/`Uz  
6PYt>r&TO  
void CCaptureDlg::OnBrowse() J8p;1-C"  
{ n]`]gLF\i  
 CString str; #Iv KI+"  
 BROWSEINFO bi; GdI,&| /  
 char name[MAX_PATH]; ye9GBAj /  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 2[ofz}k]r)  
 bi.hwndOwner=GetSafeHwnd(); %UrNPk  
 bi.pszDisplayName=name; I`X!M!dB)  
 bi.lpszTitle="Select folder"; [`b,SX x  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ]tN)HRk1  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); N6"sXw m  
 if(idl==NULL) zGR, }v%%  
  return; @Kz,TP!%A  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ">CRFee0  
 str.ReleaseBuffer(); &qG/\  
 m_Path=str; KR?aL:RYb  
 if(str.GetAt(str.GetLength()-1)!='\\') q,L>PN+W  
  m_Path+="\\"; 5\C(2naf  
 UpdateData(FALSE);   8sG?|u  
} [0y,K{8t  
|ymW0gh7o$  
void CCaptureDlg::SaveBmp() or3OLBf*Q  
{ '`2'<^yO  
 CDC dc; :_6o|9J\t  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ,"is%O.  
 CBitmap bm; kC%H E  
 int Width=GetSystemMetrics(SM_CXSCREEN); wGNE b  
 int Height=GetSystemMetrics(SM_CYSCREEN); * @]wT'  
 bm.CreateCompatibleBitmap(&dc,Width,Height); <ef O+X!  
 CDC tdc; JAd .\2%Y  
 tdc.CreateCompatibleDC(&dc); /y{: N  
 CBitmap*pOld=tdc.SelectObject(&bm); jmwN1Se>  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); &uRT/+18W3  
 tdc.SelectObject(pOld); A;Y~Hu4KPZ  
 BITMAP btm; <q$Tk,  
 bm.GetBitmap(&btm); A{ T9-f@X  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; E> GmFw  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); <b,WxR`  
 BITMAPINFOHEADER bih; 2PyuM=(Wt  
 bih.biBitCount=btm.bmBitsPixel; s_/@`kd{  
 bih.biClrImportant=0; v77UE"4|c  
 bih.biClrUsed=0; 2=fM\G  
 bih.biCompression=0; Rf8Obk<  
 bih.biHeight=btm.bmHeight; 9)v]jk  
 bih.biPlanes=1; f tTD-d  
 bih.biSize=sizeof(BITMAPINFOHEADER); jn|NrvrX  
 bih.biSizeImage=size; GqL&hbpi  
 bih.biWidth=btm.bmWidth; 5@%Gq)z5  
 bih.biXPelsPerMeter=0; \ YF@r7  
 bih.biYPelsPerMeter=0; 4;J.$  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); >~Zj  
 static int filecount=0; X}(X\rp  
 CString name; [-VH%OM  
 name.Format("pict%04d.bmp",filecount++); ~ Ze!F"  
 name=m_Path+name; I F6$@Q  
 BITMAPFILEHEADER bfh; 8|)!E`TKSV  
 bfh.bfReserved1=bfh.bfReserved2=0; g $Y]{VM.J  
 bfh.bfType=((WORD)('M'<< 8)|'B'); z0 /+P  
 bfh.bfSize=54+size; ]vz6DJs  
 bfh.bfOffBits=54; 8%m\J:e R  
 CFile bf; H"? 5]!p  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ #;a+)~3*O  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); )jgz(\KZ  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); #rX ^)2  
  bf.WriteHuge(lpData,size); ai$l7]7  
  bf.Close(); pP":,8Q{  
  nCount++; ^g6v#]&WA  
 } aSIb0`(3  
 GlobalFreePtr(lpData); ,\"x#Cc f  
 if(nCount==1) V[kJ;YLPN  
  m_Number.Format("%d picture captured.",nCount); @NA+Ma{N  
 else ^UKY1Q .  
  m_Number.Format("%d pictures captured.",nCount); C;HEv q7  
  UpdateData(FALSE); \-]Jm[]^  
} * cW%Q@lit  
2QbKh)   
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) eR5q3E/;G  
{ eC"e v5v  
 if(pMsg -> message == WM_KEYDOWN) O713'i  
 { ,jC~U s<  
  if(pMsg -> wParam == VK_ESCAPE) )u Hat#  
   return TRUE; #Y7iJPO  
  if(pMsg -> wParam == VK_RETURN) ];Noe9o  
   return TRUE; @-S7)h>~  
 } <tbs,lcw;  
 return CDialog::PreTranslateMessage(pMsg); )J@[8 x`  
} J[?oV;O  
IrCl\HQN  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) qpe9?`vVX  
{ oQ]FyV  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Ry X11XU  
  SaveBmp(); *(yw6(9%  
  return FALSE; c{1)- &W  
} ? 3fnt"  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Zj]tiN f\"  
 CMenu pop; 2*w`l|Sx  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); npkT>dB+  
 CMenu*pMenu=pop.GetSubMenu(0); <Nrtkf4-O  
 pMenu->SetDefaultItem(ID_EXITICON); Pzzzv^+  
 CPoint pt; 4K:Aqqhds  
 GetCursorPos(&pt); )fXw~  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); F~eYPaEKy!  
 if(id==ID_EXITICON) >Vq07R  
  DeleteIcon(); /'DAB**  
 else if(id==ID_EXIT) +sn0bi/rG  
  OnCancel(); xM<aQf\j  
 return FALSE; OCdX'HN5Y  
} ;U?=YSHk7  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); W#g!Usf:/  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) I_8 n>\u  
 AddIcon(); h& 4#5{=  
 return res; ZK t{3P  
} B]yO  
 -V2`[k  
void CCaptureDlg::AddIcon() Z<d=v3q  
{ D]iyr>V6'  
 NOTIFYICONDATA data; _X?_|!;J  
 data.cbSize=sizeof(NOTIFYICONDATA); 4>d]0=x  
 CString tip; #B?lU"f8q^  
 tip.LoadString(IDS_ICONTIP); Adiw@q1&  
 data.hIcon=GetIcon(0); ECL{`m(#n  
 data.hWnd=GetSafeHwnd(); '@KH@~OzRS  
 strcpy(data.szTip,tip); Dj=$Q44  
 data.uCallbackMessage=IDM_SHELL; (kX:@9Pn  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 3; z1Hp2X  
 data.uID=98; ? }ff O  
 Shell_NotifyIcon(NIM_ADD,&data); ux^rF  
 ShowWindow(SW_HIDE); P*;[&Nn4  
 bTray=TRUE; 9wfE^E1  
} ?Mo)&,__  
F# 9^RA)9  
void CCaptureDlg::DeleteIcon() ZGh6- /  
{ ;>ml@@Z  
 NOTIFYICONDATA data; J( ]b1e  
 data.cbSize=sizeof(NOTIFYICONDATA); +}udIi3:l  
 data.hWnd=GetSafeHwnd(); au=@]n#<(  
 data.uID=98; a6 :hH@,  
 Shell_NotifyIcon(NIM_DELETE,&data); tIV9Y=ckr0  
 ShowWindow(SW_SHOW); |ul{d|  
 SetForegroundWindow(); um/F:rp  
 ShowWindow(SW_SHOWNORMAL); 5>S1lyam  
 bTray=FALSE; AwuhF PG  
} X<Xiva85  
>u0XV"g$  
void CCaptureDlg::OnChange() M).CyY;bm  
{ nZYO}bv\  
 RegisterHotkey(); I4qS8~+#  
} mIrN~)C4\  
]T5\LNyN  
BOOL CCaptureDlg::RegisterHotkey() By[M|4a  
{ eFy {VpO+  
 UpdateData(); h4ntjk|{i7  
 UCHAR mask=0; 'bH~KK5  
 UCHAR key=0; WCqa[=v)t  
 if(m_bControl) h c]p^/H  
  mask|=4; XLYGhM  
 if(m_bAlt) -+2A@kmEJ  
  mask|=2; i& \ >/ 1  
 if(m_bShift) @Wm:Rz  
  mask|=1; Z{ 9Io/  
  key=Key_Table[m_Key.GetCurSel()]; `25<;@  
 if(bRegistered){ 3,hu3"@k  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); m#_M"B.cm  
  bRegistered=FALSE;  (t@!0_5  
 } b ettOg  
 cMask=mask; L|b[6[XTHL  
 cKey=key; 2*gB~Jn4  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); p,(W?.ZDN?  
 return bRegistered; c*R\fQd  
} Ed-3-vJej6  
g#1 Y4  
  四、小结 ]TtID4qL  
muK.x7zyl  
  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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