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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: 0(VQwGC[  
  *B(na+  
  一、实现方法 Zg%SE'kK  
IEV3(qzt  
  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: X%!#Ic]Q  
kWL\JDZ`.  
#pragma data_seg("shareddata") =V:rO;qX+@  
HHOOK hHook =NULL; //钩子句柄  .Ev  i  
UINT nHookCount =0; //挂接的程序数目 (6p 5 Fo  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 j r6)K;:.  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 uQ#3;sFO  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey !8]W"@qb  
static int KeyCount =0; xz YvD{>  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 JpDc3^B*  
#pragma data_seg() zH8l-0I+$  
JZ&]"12]fR  
  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。 V ^=o@I  
fL4F ~@`9l  
  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: =8 d`qS"  
"(ehf|%>%  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR }' `2C$  
cKey,UCHAR cMask) 5:SfPAx  
{ w}pFa76rm  
 BOOL bAdded=FALSE; @)iv'   
 for(int index=0;index<MAX_KEY;index++){ P-ma~g>I  
  if(hCallWnd[index]==0){ :NHh`@0F  
   hCallWnd[index]=hWnd; $H^hK0?'  
   HotKey[index]=cKey; m*h d%1D  
   HotKeyMask[index]=cMask; & v=2u,]T  
   bAdded=TRUE; |r5|IA  
   KeyCount++; Vin d\yvM  
   break; G8"L #[~  
  } |{HtY  
 } pdsjX)O+f  
 return bAdded; ~DcX}VCm  
} ]>K%,}PS  
//删除热键 7,ODh-?ez  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ,dKcxp~[  
{ }Tn]cL{]C  
 BOOL bRemoved=FALSE; R% XbO~{u  
 for(int index=0;index<MAX_KEY;index++){ uY5&93R  
  if(hCallWnd[index]==hWnd){ FLY#   
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ /kyuL]6  
    hCallWnd[index]=NULL; *iS<]y  
    HotKey[index]=0; G}mJtXT#=  
    HotKeyMask[index]=0; N. 3 x[%:  
    bRemoved=TRUE; z (rQ6  
    KeyCount--; nm 66U4.@  
    break; }NDw3{zn  
   } J\XYUs  
  } )DuOo83n["  
 } ws4a(1  
 return bRemoved; mKynp  
} \(jSkrrD  
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GEy^*, d  
  DLL中的钩子函数如下: 9>d$a2 nc  
:<Y,^V(  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) T<~NB5&f  
{ #)_4$<P*'  
 BOOL bProcessed=FALSE; o6K\z+.{  
 if(HC_ACTION==nCode) HgE^#qD?  
 { LJYFz=p "  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 K~AQ) ]pJI  
   switch(wParam) CD%wi:C%|  
   {  +LV~%?W  
    case VK_MENU: ZeF PwW  
     MaskBits&=~ALTBIT; draY /  
     break; mYXe0E#6  
    case VK_CONTROL: |#$Wh+,*  
     MaskBits&=~CTRLBIT; FVsVY1  
     break; D_D<N(O  
    case VK_SHIFT: X'e@(I!0  
     MaskBits&=~SHIFTBIT; 1Ah  
     break; &H;0N"Fn  
    default: //judge the key and send message G$:T!  
     break; bl(rCbj(w  
   } V[Fzh\2n  
   for(int index=0;index<MAX_KEY;index++){ Xm*gH, '  
    if(hCallWnd[index]==NULL) 4&~1|B{Z  
     continue; Zz= +?L  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) v! uD]}  
    { Hb=4k)-/]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); cD Z]r@AQ  
     bProcessed=TRUE; [F%INl-sy  
    } n  !]_o  
   } X*1vIs;[@  
  } G%-[vk#]  
  else if((lParam&0xc000ffff)==1){ //有键按下 Ki{&,:@  
   switch(wParam) Uaog_@2n,  
   { 5Y)*-JY1g  
    case VK_MENU: B. 6gJ2c  
     MaskBits|=ALTBIT; 2ksX6M3kY  
     break; mu04TPj  
    case VK_CONTROL: ]wWN~G)2lV  
     MaskBits|=CTRLBIT; U)=?3}s(  
     break; *xA&t)z(i  
    case VK_SHIFT: 8-UlbO6  
     MaskBits|=SHIFTBIT; _a"5[sG  
     break; :84fd\It4  
    default: //judge the key and send message f"q='B9_T\  
     break; ?@6N EfQf  
   } y[oc^Zuo  
   for(int index=0;index<MAX_KEY;index++){ q>X#Aaib  
    if(hCallWnd[index]==NULL) ]6Kx0mW  
     continue; +rfw)c'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) a,x-akZWf  
    { F]@vmzr  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); :w:hqe|_  
     bProcessed=TRUE; w4<1*u@${  
    } j8WnXp_  
   } \I1+J9Gl  
  } ZGf R:a)wc  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 3|8\,fO?  
   for(int index=0;index<MAX_KEY;index++){ Z\D!'FX  
    if(hCallWnd[index]==NULL) oOUL<ihe?  
     continue; ,1EyT>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) u;H SX  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Eb{Zm<TP  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 CWdA8)n.  
   } %WiDz0o  
  } 5Jh=${  
 } 9'faH  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); @v\Osp t=  
} `WGT`A"  
thIuK V{CO  
  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: pca `nN!  
>VM@9Cph  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "VR>nyG%  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .z4 fJx  
sxinA8  
  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: r) ;U zd  
<R582$( I  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) <SGO+1zt p  
{ O{SP4|0JV  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) c+,F)i^`  
 { '`&gSL.1a@  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 nh"nSBRxk  
  SaveBmp(); UUJbF$@;  
  return FALSE; Q^>"AhOiU  
 } / CEnyE/  
 …… //其它处理及默认处理 X*hY?'Rp  
} W5PNp%+KE  
/#lhRNX  
g|ewc'y  
  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。 jI %v[]V  
#N9^C@  
  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。 k#X~+}N^  
}5 ^2g!M  
  二、编程步骤 gpDH_!K  
y:u7*%"  
  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"; b5lZ||W.  
k=!lPIx  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; s :ig;zb  
~Gm<F .(+  
  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; ^=`7]E[p  
1=:=zyEEo  
  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; l{<+V)  
7.mY@  
  5、 添加代码,编译运行程序。 5IE3[a%X  
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三、程序代码 {~q"Y]?  
`u6CuH5  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL MIma:N_c  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) '[(]62j  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ '0q.zzv|_  
#if _MSC_VER > 1000 uqy&P S  
#pragma once 3kfrOf.4h  
#endif // _MSC_VER > 1000 NV\t%/ ?  
#ifndef __AFXWIN_H__ N$]B$vv  
#error include 'stdafx.h' before including this file for PCH ehCGu( =  
#endif )N$T&  
#include "resource.h" // main symbols xe?!UCUb@  
class CHookApp : public CWinApp VF[$hs  
{ G#yv$LY#  
 public: !jlLF:v|1A  
  CHookApp(); "i>?Tg^  
  // Overrides l@:Tw.+/9  
  // ClassWizard generated virtual function overrides E$l4v>iA  
  //{{AFX_VIRTUAL(CHookApp) -wn ,7;  
 public: ^f6p w!  
  virtual BOOL InitInstance(); ov;1=M~RF  
  virtual int ExitInstance(); "?9rJx$  
  //}}AFX_VIRTUAL ;B*im S10  
  //{{AFX_MSG(CHookApp) `%S 35x9  
  // NOTE - the ClassWizard will add and remove member functions here. -wr#.8rzTT  
  // DO NOT EDIT what you see in these blocks of generated code ! "3Y(uN  
  //}}AFX_MSG )&/ecx"2Q  
  DECLARE_MESSAGE_MAP() oP >+2.i  
}; $fifx>!  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); -YvnX0j+  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); !UHWCJ< <w  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); x -;tV=E}  
BOOL InitHotkey(); FK;3atrz  
BOOL UnInit(); ,GO H8h  
#endif EPeKg{w  
|ppG*ee  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. "06t"u<%  
#include "stdafx.h" I;xSd.-  
#include "hook.h" j-]`;&L  
#include <windowsx.h> 7pPaHX8  
#ifdef _DEBUG h;TN$ /  
#define new DEBUG_NEW 9-:\ NH^;  
#undef THIS_FILE [vv $"$z  
static char THIS_FILE[] = __FILE__; 7:/gO~g I  
#endif <|-da&7  
#define MAX_KEY 100 T)c<tIr6  
#define CTRLBIT 0x04 ,J;Cb}  
#define ALTBIT 0x02 tzIcR #Z  
#define SHIFTBIT 0x01 CghlyT  
#pragma data_seg("shareddata") w?#s)z4}g  
HHOOK hHook =NULL; Cb}I-GtO  
UINT nHookCount =0; ehTrjb3k  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey  zSd!n  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Ww=^P{q\  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey w'uB&z4'  
static int KeyCount =0; 6W\G i>  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift LX'z7fh  
#pragma data_seg() {,NF'x4$  
HINSTANCE hins; [?>\]  
void VerifyWindow(); &&PXWR!%]  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) -v %n@8p  
//{{AFX_MSG_MAP(CHookApp) px${ "K<  
// NOTE - the ClassWizard will add and remove mapping macros here. .9NYa|+0  
// DO NOT EDIT what you see in these blocks of generated code! "ov270:  
//}}AFX_MSG_MAP iW%~>`tT  
END_MESSAGE_MAP() i(qZ#oN  
NH aY&\  
CHookApp::CHookApp() G)8v~=Bv  
{ '3|fv{I  
 // TODO: add construction code here, =;Q:z^S  
 // Place all significant initialization in InitInstance h0.2^vM)R  
} q-hREO  
\s?8}k  
CHookApp theApp; U9"(jl/o  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 9Bao~(j/k  
{ !S~0T!afF  
 BOOL bProcessed=FALSE; WQ+ xS!ba  
 if(HC_ACTION==nCode)  CK+t6Gp  
 { {8* d{0l  
  if((lParam&0xc0000000)==0xc0000000){// Key up 3 \}>nE  
   switch(wParam) }]i.z:7+  
   { FG!2h&k  
    case VK_MENU: |:w)$i& *  
     MaskBits&=~ALTBIT; I>EEUQR/$H  
     break; ^UCH+C yl  
    case VK_CONTROL: oGRd ;hsF  
     MaskBits&=~CTRLBIT; 6gs0Vm  
     break; S4U}u l  
    case VK_SHIFT: [H[L};%=j  
     MaskBits&=~SHIFTBIT; KAJR.YNm  
     break; R53^3"q~  
    default: //judge the key and send message Xp+lpVcJ  
     break; 1/f{1k  
   } lqTc6@:D  
   for(int index=0;index<MAX_KEY;index++){ r2*8.j51  
    if(hCallWnd[index]==NULL) NkV81?  
     continue; A?bqDy  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) uH&B=w  
    { i E?yvtr8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); b>2{F6F  
     bProcessed=TRUE; UgL FU#  
    } A.vf)hO  
   }  PI.Zd1r  
  } Z;<:=#  
  else if((lParam&0xc000ffff)==1){ //Key down KKq%'y)u^  
   switch(wParam) $cW t^B'  
   { ck< `kJ`b  
    case VK_MENU: -7KoR}Ck!  
     MaskBits|=ALTBIT; .?vHoNvo  
     break; 8y']kVg  
    case VK_CONTROL: 9}wI@  
     MaskBits|=CTRLBIT; 43 vF(<r&f  
     break; ..kFn!5(g  
    case VK_SHIFT: ]Cs=EZr  
     MaskBits|=SHIFTBIT; WG&! VK  
     break; fGd1  
    default: //judge the key and send message ppo0DC\>  
     break; )@ofczl6  
   } jddhX]>I  
   for(int index=0;index<MAX_KEY;index++) q3v v^~  
   { _NB*+HVo  
    if(hCallWnd[index]==NULL) "F =NDF  
     continue; -{}h6r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *c\XQy  
    { boI&q>-6Re  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 's.e"F#  
     bProcessed=TRUE; NB4 Q,iq$  
    } Y&1N*@YP  
   } 3G[|4v?[<_  
  } "=w:LRw  
  if(!bProcessed){ 'QQq0.  
   for(int index=0;index<MAX_KEY;index++){ xG;;ykh.]  
    if(hCallWnd[index]==NULL) q_6fr$-Qh  
     continue; H $ %F0'0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) &09&;KJ  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); GM8Q#vc  
   } wH$qj'G4CN  
  } `Se2f0",  
 } @t a:9wZ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); -u(,*9]cJ*  
} E~#G_opQA  
c4u/tt.)  
BOOL InitHotkey() 0hhxTOp  
{ Rc:}%a%e  
 if(hHook!=NULL){ >|z:CX$]  
  nHookCount++; tz8 fZ*n  
  return TRUE; 8k3y"239t  
 } Wsgp#W+  
 else qw$9i.Z  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); <S=( `D  
  if(hHook!=NULL) MhR`  
   nHookCount++; RcO"k3J  
  return (hHook!=NULL); tfe]=_U  
} 0%Le*C'yk  
BOOL UnInit() c~4Cpy^  
{ ZY8w1:'  
 if(nHookCount>1){ tkH]_cH'w  
  nHookCount--; g^Hf^%3xP  
  return TRUE; UWnF2,<s;  
 } o">~ObR  
 BOOL unhooked = UnhookWindowsHookEx(hHook); M(nzJ  
 if(unhooked==TRUE){  ?HRS*  
  nHookCount=0; er5!n e  
  hHook=NULL; UOFb.FRP>  
 } _  xym  
 return unhooked; n807?FORB  
} IIih9I`IR  
uJCp  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "AZ|u#0P  
{ !qp$Xtf+  
 BOOL bAdded=FALSE; "0uM%*2  
 for(int index=0;index<MAX_KEY;index++){ .;Mb4"7=  
  if(hCallWnd[index]==0){ tewp-M KA  
   hCallWnd[index]=hWnd; <$yA*  
   HotKey[index]=cKey; `u}_O(A1pA  
   HotKeyMask[index]=cMask; mZ2CG O R  
   bAdded=TRUE; p3Qls*  
   KeyCount++; U#c Gd\b  
   break; 'iF%mnJ  
  } f] #\&"  
 } u178vby;l  
 return bAdded; Ovc9x\N  
} JH{/0x#+  
"5L?RkFi\  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) >t.Lc.  
{ {?`7D:]`^  
 BOOL bRemoved=FALSE; =y-yHRC7  
 for(int index=0;index<MAX_KEY;index++){ -N% V5 TN  
  if(hCallWnd[index]==hWnd){ hcj]T?  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 6i-G{)=l  
    hCallWnd[index]=NULL; T 5Zh2Q@  
    HotKey[index]=0; +Eh.PWEe  
    HotKeyMask[index]=0; bS;_xDXd  
    bRemoved=TRUE; McN[  
    KeyCount--; r}&&e BY f  
    break; FJDC^@Ne  
   } J{^md0l  
  } Mib .,J~  
 } eM_;rMCr}  
 return bRemoved; [:.wCG5  
} |,p"<a!+{w  
WM`3QJb  
void VerifyWindow() COsmVQ.  
{ d_d&su E  
 for(int i=0;i<MAX_KEY;i++){ =TDKU  
  if(hCallWnd!=NULL){ }< H>9iJ:  
   if(!IsWindow(hCallWnd)){ 'bJGQ[c  
    hCallWnd=NULL; Bkd$'7UT  
    HotKey=0; e)wi}\:q_  
    HotKeyMask=0; _$96y]Bpi  
    KeyCount--; ed`"xm  
   } \894 Jqh  
  } #?Kw y  
 } 0: a2ER|J  
} $*942. =Q  
wYf\!]}'  
BOOL CHookApp::InitInstance() . 2$J-<O  
{ 5PO_qr= Hx  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); JyZuj>` 6  
 hins=AfxGetInstanceHandle(); tO{{ci$-T  
 InitHotkey(); !h4T3sO  
 return CWinApp::InitInstance(); : c~SH/qS  
} TL2E|@k1]  
@>Yd6C  
int CHookApp::ExitInstance() R1X'}#mU  
{ .*x:  
 VerifyWindow(); w[ v {)  
 UnInit(); 9^W7i]-Z  
 return CWinApp::ExitInstance(); S[exnZ*Y  
} -DdHl8  
*sOb I(&  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 3~T ~Bs  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ekvs3a^  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ B^/MwD>%  
#if _MSC_VER > 1000 EjLq&QR.  
#pragma once $KYGQP  
#endif // _MSC_VER > 1000 WVRIq'  
>t3_]n1e  
class CCaptureDlg : public CDialog VKl,m ;&N  
{ 6 X~><r  
 // Construction ).;{'8Q  
 public: i"}z9Ae~.  
  BOOL bTray; n7fhc*}:`  
  BOOL bRegistered; !CUl1L1DSi  
  BOOL RegisterHotkey(); 8{jXSCP#  
  UCHAR cKey; dhtH&:J< ;  
  UCHAR cMask; Q4m> 3I  
  void DeleteIcon(); DLrV{8%W  
  void AddIcon(); E xhih^[_  
  UINT nCount; Cw+boB_tip  
  void SaveBmp(); ?YW~7zG  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 3W7^,ir  
  // Dialog Data :awkhx  
  //{{AFX_DATA(CCaptureDlg) OP1` !P y  
  enum { IDD = IDD_CAPTURE_DIALOG }; ^$: w  
  CComboBox m_Key; QFx3N%  
  BOOL m_bControl; QT,T5Q%JP:  
  BOOL m_bAlt; d$3rcH1  
  BOOL m_bShift; FB[b]+t`D{  
  CString m_Path; T&_&l;syA  
  CString m_Number; #gQn3.PX+y  
  //}}AFX_DATA ByY2KJ7  
  // ClassWizard generated virtual function overrides RqTO3Kf  
  //{{AFX_VIRTUAL(CCaptureDlg) >Bb X:  
 public: gS'{JZu2  
  virtual BOOL PreTranslateMessage(MSG* pMsg); fB3Jp~$  
 protected: pq{`WgA^  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support @ !P2f   
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); <2U@O` gC  
  //}}AFX_VIRTUAL {KWVPeh  
  // Implementation G1z*e.+y  
 protected: 2'?'dfj  
  HICON m_hIcon; 23):OB>S`  
  // Generated message map functions !G3AD3  
  //{{AFX_MSG(CCaptureDlg) gsyOf*Q$  
  virtual BOOL OnInitDialog(); s$Y>nH~T  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 0#8   
  afx_msg void OnPaint(); i\6CE|  
  afx_msg HCURSOR OnQueryDragIcon(); DEZww9T2Qs  
  virtual void OnCancel(); {nV/_o$$  
  afx_msg void OnAbout(); 49; 'K  
  afx_msg void OnBrowse(); F"] P|   
  afx_msg void OnChange(); - Z,Qj"V  
 //}}AFX_MSG L[Vk6e  
 DECLARE_MESSAGE_MAP() *SNdU^!  
}; \P.h;|u  
#endif /A7( `l;6  
r !Aj5  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ~</FF'Xz  
#include "stdafx.h" !1)aie+p6  
#include "Capture.h" +X/a+y-  
#include "CaptureDlg.h" 5*%Gh&)  
#include <windowsx.h> m8fj\,X  
#pragma comment(lib,"hook.lib") bp?5GU&Uy  
#ifdef _DEBUG ln82pQD2Y~  
#define new DEBUG_NEW EH |+S  
#undef THIS_FILE <c}@lj-j  
static char THIS_FILE[] = __FILE__; KyyR Hf5  
#endif Y*c]C;%=  
#define IDM_SHELL WM_USER+1 uxf,95<g)  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $.jG O!  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); X+;[Gc}(W  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ?Zb+xNKJ(  
class CAboutDlg : public CDialog dQj/ Sr  
{ i5}Zk r  
 public: DO: ,PZX  
  CAboutDlg(); J9mK9{#q  
  // Dialog Data ?#K.D vGJ  
  //{{AFX_DATA(CAboutDlg) *C*ZmC5  
  enum { IDD = IDD_ABOUTBOX }; n-ffX*zA(  
  //}}AFX_DATA RM|J |R  
  // ClassWizard generated virtual function overrides 6j6CA?|  
  //{{AFX_VIRTUAL(CAboutDlg) }:#WjH^  
 protected: 8TP$?8l  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support )=~&l={T  
  //}}AFX_VIRTUAL NpH8=H9  
  // Implementation 0zr27ko  
 protected: x0<;Rm [u=  
  //{{AFX_MSG(CAboutDlg) .#yg=t1C  
  //}}AFX_MSG EsGu#lD2  
  DECLARE_MESSAGE_MAP() O@Aazc5K  
}; q| D5 A|)  
aS [[ AL  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) L )JB^cxf  
{ .t@|2  
 //{{AFX_DATA_INIT(CAboutDlg) ,clbD4  
 //}}AFX_DATA_INIT #kC~qux^  
} 4eHSAN"$  
,sL'T[tuiU  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Ce}`z L  
{ 8 Rj5~+5  
 CDialog::DoDataExchange(pDX); ^@^8iZ  
 //{{AFX_DATA_MAP(CAboutDlg) ;\RV C 7  
 //}}AFX_DATA_MAP 40kAGs>_  
} i6if\B  
G)7U &B  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) k+h}HCzE  
 //{{AFX_MSG_MAP(CAboutDlg) Av.tr&ZNb  
 // No message handlers 8 1Kf X {|  
 //}}AFX_MSG_MAP dtR"5TL<~}  
END_MESSAGE_MAP() ['mpxtG  
8oX1 F(R  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ]\M{Abqd{  
: CDialog(CCaptureDlg::IDD, pParent) VIp|U{  
{ v}$Q   
 //{{AFX_DATA_INIT(CCaptureDlg) layxtECP(  
  m_bControl = FALSE; q}@L"a`  
  m_bAlt = FALSE; hZ45i?%  
  m_bShift = FALSE; |A3"Jc.2o  
  m_Path = _T("c:\\"); egq,)6>  
  m_Number = _T("0 picture captured."); w 0BphK[  
  nCount=0; eft=k}  
  bRegistered=FALSE; pQa51nc  
  bTray=FALSE; O\=Z;}<N  
 //}}AFX_DATA_INIT F1yn@a "=J  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 )  ;0  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); p'h'Cz  
} _5p$#U`  
g6Vkns4  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) "|3I|#s  
{ S\:^#Yi`  
 CDialog::DoDataExchange(pDX); .\XRkr'-  
 //{{AFX_DATA_MAP(CCaptureDlg) ]K(a32VCH  
  DDX_Control(pDX, IDC_KEY, m_Key); ,j%\3g`  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); QEJu.o  
  DDX_Check(pDX, IDC_ALT, m_bAlt); oZ%uq78#[%  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); bsQ'kBD  
  DDX_Text(pDX, IDC_PATH, m_Path); NljpkeX'  
  DDX_Text(pDX, IDC_NUMBER, m_Number); (ks>F=vk*  
 //}}AFX_DATA_MAP I*-\u  
} 8&@=Anc&q  
[5P-K{Ko  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) hY4#4A`I  
//{{AFX_MSG_MAP(CCaptureDlg) wC{sP"D  
 ON_WM_SYSCOMMAND() TZgtu+&  
 ON_WM_PAINT() M1Q&)am  
 ON_WM_QUERYDRAGICON() |P5dv>tb F  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Oa/^A-'Q  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) +p\E%<uQ  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ;?Pz0,{h  
//}}AFX_MSG_MAP 1n`[D&?q  
END_MESSAGE_MAP() -m`|Sq  
Km5_P##  
BOOL CCaptureDlg::OnInitDialog() Exw d,2>  
{ JO|j?%6YY  
 CDialog::OnInitDialog(); 6(E4l5 %  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Z 8w\[AF{$  
 ASSERT(IDM_ABOUTBOX < 0xF000); K GgtEh|  
 CMenu* pSysMenu = GetSystemMenu(FALSE); n5QO'Jr%[  
 if (pSysMenu != NULL) Z|qI[uiO  
 { V>Jr4z  
  CString strAboutMenu; li*S^uSF  
  strAboutMenu.LoadString(IDS_ABOUTBOX); N]W*ei  
  if (!strAboutMenu.IsEmpty()) Nn_fhc>  
  { dy6zrgxygP  
   pSysMenu->AppendMenu(MF_SEPARATOR); 2? E;(]dQ  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 1| sem(t  
  } n{QyqI  
 } 08ZvRy(Je<  
 SetIcon(m_hIcon, TRUE); // Set big icon V[.{cY ?6  
 SetIcon(m_hIcon, FALSE); // Set small icon SWdmej[  
 m_Key.SetCurSel(0); 8#QT[H 4F  
 RegisterHotkey(); UuIjtqW  
 CMenu* pMenu=GetSystemMenu(FALSE); .<t{saToU  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); )>ff"| X  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ?i<l7   
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); }%XB*pzQ  
 return TRUE; // return TRUE unless you set the focus to a control 0N1t.3U  
} ,3?=W/Um4  
"r6qFxY  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ]>~.U ~  
{ f,O10`4s  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) J^"_H:1[  
 { *9n[ #2sM<  
  CAboutDlg dlgAbout; C@-Hm  
  dlgAbout.DoModal(); 8>x5|  
 } [],[LkS  
 else EeYL~ORdi  
 { le5@WG/x  
  CDialog::OnSysCommand(nID, lParam); 5j`sJvq  
 } 8$-MUF,  
} 6Jgl"Jw8  
j"jssbu}  
void CCaptureDlg::OnPaint() 0Px Hf*  
{ JlSqTfA  
 if (IsIconic()) yD<#Q\,  
 { Jz''UJY/O  
  CPaintDC dc(this); // device context for painting 7T[L5-g  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 6O/L~Z*t  
  // Center icon in client rectangle ~;(\a@ _  
  int cxIcon = GetSystemMetrics(SM_CXICON); cEHpa%_5  
  int cyIcon = GetSystemMetrics(SM_CYICON); IEm?'o:  
  CRect rect; u/W{JPlL  
  GetClientRect(&rect); R V#w 0 r  
  int x = (rect.Width() - cxIcon + 1) / 2; E zcch1  
  int y = (rect.Height() - cyIcon + 1) / 2; "*zDb|v  
  // Draw the icon }zA|M9%E  
  dc.DrawIcon(x, y, m_hIcon); ?Z|y-4 &>  
 } _CNXyFw.7  
 else g;Fd m5Q  
 { /,:cbpHsu  
  CDialog::OnPaint(); /%m?D o  
 } nWelM2  
} }'<Z&NW6  
moM'RO,M  
HCURSOR CCaptureDlg::OnQueryDragIcon() K14.!m  
{ l4kqz.Z-g  
 return (HCURSOR) m_hIcon; ,U9j7E<4  
} 6%EpF;T`  
4"PA7 e  
void CCaptureDlg::OnCancel() OC5oxL2HTe  
{ ]9 @4P$I  
 if(bTray) Rs<S}oeLn  
  DeleteIcon(); qo9&e~Y<G  
  CDialog::OnCancel(); x6>WvF Z  
} 44QW&qL!(  
bHTf{=  
void CCaptureDlg::OnAbout() ]>)}xfL &,  
{ 0uKm)t/  
 CAboutDlg dlg; a/E(GQ,,  
 dlg.DoModal(); uEPm[oyX  
} p!DdX  
~RLjL"  
void CCaptureDlg::OnBrowse() djf8FNnn  
{ fwtsr>SV  
 CString str; `mkOjsj &  
 BROWSEINFO bi; :V8oWMY  
 char name[MAX_PATH]; pz2E+o  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); s,-<P1}/  
 bi.hwndOwner=GetSafeHwnd(); VIWH~UR)&!  
 bi.pszDisplayName=name; mmFcch$Jv  
 bi.lpszTitle="Select folder"; )cN=/i  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; U;&s=M0[  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ;Qd'G7+  
 if(idl==NULL) H"+|n2E^  
  return; H|s Iw:  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); W*H%\Y:N  
 str.ReleaseBuffer(); 6jr}l  
 m_Path=str; O0^Y1l  
 if(str.GetAt(str.GetLength()-1)!='\\') 1|*%  
  m_Path+="\\";  t":^:i'M  
 UpdateData(FALSE); !OV+2suu1  
} fpNq  
o)\EfPT  
void CCaptureDlg::SaveBmp() #\~m}O,  
{ {w>ofyqfp&  
 CDC dc; ]I~BgE;C9  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 5'Mw{`  
 CBitmap bm; %Y`)ZKh  
 int Width=GetSystemMetrics(SM_CXSCREEN); ADP[KZO$ 4  
 int Height=GetSystemMetrics(SM_CYSCREEN);  0Ns Po  
 bm.CreateCompatibleBitmap(&dc,Width,Height); )$Fw<;4  
 CDC tdc; Pw|/PfG  
 tdc.CreateCompatibleDC(&dc); #SLi v  
 CBitmap*pOld=tdc.SelectObject(&bm); W*c^(W  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 1%.CtTi  
 tdc.SelectObject(pOld); ~O;?;@  
 BITMAP btm; cCtd\/ \  
 bm.GetBitmap(&btm);  qzD  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; K(mzt[n(  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); w4y ???90)  
 BITMAPINFOHEADER bih; k:s86q  
 bih.biBitCount=btm.bmBitsPixel; -% B)+yq>  
 bih.biClrImportant=0; k<*1mS8  
 bih.biClrUsed=0; ,J*#Ixe}  
 bih.biCompression=0; a;7gy419<p  
 bih.biHeight=btm.bmHeight; mX SLH'  
 bih.biPlanes=1; bxz6 >>  
 bih.biSize=sizeof(BITMAPINFOHEADER); 7Il /+l(  
 bih.biSizeImage=size; .@(MNq{"6  
 bih.biWidth=btm.bmWidth; hEFn>  
 bih.biXPelsPerMeter=0; ;hDIoSz  
 bih.biYPelsPerMeter=0; +Y~,1ai 5^  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); (j}Wt8  
 static int filecount=0; i#lO{ ]  
 CString name; t;%MSedn  
 name.Format("pict%04d.bmp",filecount++); AK;G_L  
 name=m_Path+name; Lp||C@h~  
 BITMAPFILEHEADER bfh; [0NH#88ym<  
 bfh.bfReserved1=bfh.bfReserved2=0; <CP't[  
 bfh.bfType=((WORD)('M'<< 8)|'B'); >>7m'-k%D  
 bfh.bfSize=54+size; $_Lcw"xO  
 bfh.bfOffBits=54; 5[qx5|O  
 CFile bf; fwyz|>H_Y(  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ j"+R*H(#  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); n]JfdI  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); +>h'^/rAE  
  bf.WriteHuge(lpData,size); vw q Y;7  
  bf.Close(); ET]`  
  nCount++; nG5:H.)  
 } Se5jxV  
 GlobalFreePtr(lpData); LTY(6we-  
 if(nCount==1) S1$&  
  m_Number.Format("%d picture captured.",nCount); U}`HN*Q.q  
 else DOo34l6#  
  m_Number.Format("%d pictures captured.",nCount); Yv;18j*<  
  UpdateData(FALSE); k3"Y!Uha:  
} _{gRCR)  
v/Ei0}e6~  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) !U+XIr  
{ {,m W7  
 if(pMsg -> message == WM_KEYDOWN) l3/?,xn  
 { 9s6d+HhM  
  if(pMsg -> wParam == VK_ESCAPE) c/}bx52>u  
   return TRUE; a_(vpD^  
  if(pMsg -> wParam == VK_RETURN) ;lb@o,R :  
   return TRUE; cbA90 8@s  
 } 8-R; &  
 return CDialog::PreTranslateMessage(pMsg); D(S^g+rd  
} b _0Xi  
I%G6V a@  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) FZtIC77X5  
{ "^iw {]~U  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ bxg9T(Bj  
  SaveBmp(); {Uu|NA87Cd  
  return FALSE; 3>sA_  
} hI 1 }^;  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ a)8M'f_z  
 CMenu pop; hbdM}"&]  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 0~XZ  
 CMenu*pMenu=pop.GetSubMenu(0); SfwAMNCe  
 pMenu->SetDefaultItem(ID_EXITICON); V5LzUg]  
 CPoint pt; AA,n.;zy<  
 GetCursorPos(&pt); Q|o~\h<  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); wN!5[N"  
 if(id==ID_EXITICON) !n/"39KT  
  DeleteIcon(); S-6 %mYf  
 else if(id==ID_EXIT) S(*SUH  
  OnCancel(); )b AcU  
 return FALSE; Hlq#X:DCn  
} &P{[22dQ  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 5Y97?n+6  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ] Vbv64M3  
 AddIcon(); F .JvMy3  
 return res; S2fBZ=V8  
} 5eW GX  
}%9A+w}o  
void CCaptureDlg::AddIcon() Lm}:`  
{ 3"hPplE  
 NOTIFYICONDATA data; 3v%V\kO=F  
 data.cbSize=sizeof(NOTIFYICONDATA); cA4xx^~  
 CString tip; wGf SVA-q\  
 tip.LoadString(IDS_ICONTIP); _6 |lw&o07  
 data.hIcon=GetIcon(0); }A%Sx!7~  
 data.hWnd=GetSafeHwnd(); *G#W],~0  
 strcpy(data.szTip,tip); 3Ga! )  
 data.uCallbackMessage=IDM_SHELL; y\&`A:^[ A  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; @nS+!t{  
 data.uID=98;  + >oA@z  
 Shell_NotifyIcon(NIM_ADD,&data); 7,2bR  
 ShowWindow(SW_HIDE); Ie~#k[X  
 bTray=TRUE; J_A5,K*r|  
} I vQ]-A}N  
=X11x)]F9  
void CCaptureDlg::DeleteIcon() Rs cU=oaKi  
{ 0)'^vJe  
 NOTIFYICONDATA data; Q_F8u!qrZ  
 data.cbSize=sizeof(NOTIFYICONDATA); Q=%1@ ,x"  
 data.hWnd=GetSafeHwnd(); ~sSlfQWMzy  
 data.uID=98; jdGoPa\  
 Shell_NotifyIcon(NIM_DELETE,&data); b}9Ry"  
 ShowWindow(SW_SHOW); qffXm `k  
 SetForegroundWindow(); w#5^A(NR  
 ShowWindow(SW_SHOWNORMAL); S]3t{s#JW7  
 bTray=FALSE; y#Ao6Od6  
} ^U.8grA  
Y\ len  
void CCaptureDlg::OnChange() bCF"4KXK  
{ [g:ZIl4p\P  
 RegisterHotkey(); q]Cmaf(  
} @<tkwu  
 c6;tbL  
BOOL CCaptureDlg::RegisterHotkey() a 8Jn.!  
{ +tNu8M@xFo  
 UpdateData(); >?q()>l  
 UCHAR mask=0; kmm1b (  
 UCHAR key=0; UHYnl ]  
 if(m_bControl) shOQ/  
  mask|=4; d3# >\QCD9  
 if(m_bAlt) eEIa=MB*  
  mask|=2; d3AOuVUf  
 if(m_bShift) :Uf\r `a9  
  mask|=1; Q0I22?  
  key=Key_Table[m_Key.GetCurSel()]; d([NU;  
 if(bRegistered){ 8=H!&+aGh  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Yqy7__vm  
  bRegistered=FALSE; 2 Ke?*  
 } u|.L7 3<j%  
 cMask=mask; fYR*B0tu  
 cKey=key; lz1l1.f8  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); `Li3=!V[  
 return bRegistered; G-[fz  
} Lmx95[#@a  
{(i>$RG_  
  四、小结 +v3@WdLcD  
:e 5)Q=lX  
  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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