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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: !yo/ F& 6  
  qM."W=XVN  
  一、实现方法 !zd]6YL$  
{iyO96YI[^  
  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: KNkVI K  
`YZK$ -,  
#pragma data_seg("shareddata") tKnvNOhn  
HHOOK hHook =NULL; //钩子句柄 m_ |:tU(t  
UINT nHookCount =0; //挂接的程序数目 x"n!nT%Z  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 aetK<9L$  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 dW32O2@-  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey /G zA89N(  
static int KeyCount =0; ;Y&<psQeb  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 !L+4YA  
#pragma data_seg() Z/|oCwR  
M!{;:m28X!  
  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。 O3?3XB> <  
b"au9:F4@7  
  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: (-RZ|VdYg  
R3HfE*;Z  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 5$v,%~$Xds  
cKey,UCHAR cMask) =Me94w>G3X  
{ "Y9PS_u(~  
 BOOL bAdded=FALSE; d!V;\w  
 for(int index=0;index<MAX_KEY;index++){ c k$ > yk  
  if(hCallWnd[index]==0){ ZB+N[VJs)  
   hCallWnd[index]=hWnd; h)W?8XdM  
   HotKey[index]=cKey; Fp)+>o T  
   HotKeyMask[index]=cMask; igoXMsifT+  
   bAdded=TRUE; Ft7{P.g  
   KeyCount++; n/ \{}9   
   break; ,qx;kJJ  
  } {^r8uKo:~  
 } 8{m5P8w'  
 return bAdded; X=:|v<E   
} gUfLw  
//删除热键 hdi/k!9[\  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) F"3LG"  
{ 4CzT<cp  
 BOOL bRemoved=FALSE; X1 A~#w>  
 for(int index=0;index<MAX_KEY;index++){ &\3k(j  
  if(hCallWnd[index]==hWnd){ >)/,5VSE  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ .L,xqd[zC  
    hCallWnd[index]=NULL; H5L~[\ 5t  
    HotKey[index]=0; o\_@4hXf  
    HotKeyMask[index]=0; aV^wTs#2I  
    bRemoved=TRUE; 7^{M:kYC!  
    KeyCount--; ?w{lC,  
    break; 6ty>0  
   } 6`KAl rH  
  } P/BWFN1  
 } ^)r^k8y'  
 return bRemoved; (+@ Lnz\  
} X[Lwx.Ly8  
2"31k2H[  
q*^Y8s~3I  
  DLL中的钩子函数如下: $1QQidB  
-`z`K08sT  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) &3 QdQ n,  
{ D1&%N{  
 BOOL bProcessed=FALSE; E0;KTcZi  
 if(HC_ACTION==nCode) bITc9Hqc  
 { 0JQ0lzk1  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 * u_ nu>  
   switch(wParam) f0uzoeL<%  
   {  #WBlEVx;Z  
    case VK_MENU: _JlbVe[<  
     MaskBits&=~ALTBIT; taS2b#6\+  
     break; BPp`r_m8w}  
    case VK_CONTROL: W/(D"[:l%  
     MaskBits&=~CTRLBIT; 3Un{Q~6h  
     break; d$>TC(E=t  
    case VK_SHIFT: YCJ6an  
     MaskBits&=~SHIFTBIT; ^DL}J>F9G  
     break; ^4Nk13  
    default: //judge the key and send message mv7><C  
     break; `>M-J-J  
   } m).S0  
   for(int index=0;index<MAX_KEY;index++){ QvM+]pdR6  
    if(hCallWnd[index]==NULL) kz|2PP  
     continue; ` u#'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) p0 @ ,-  
    { `[hc{ynO|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Nm{\?  
     bProcessed=TRUE; .ZuRH_pI  
    } r(ej=aR  
   } )E--E+j  
  } )ZxDfRjL  
  else if((lParam&0xc000ffff)==1){ //有键按下 Xb0$BAP  
   switch(wParam) nz72w_  
   { hE|Z~5\Y,>  
    case VK_MENU: p.{M sn  
     MaskBits|=ALTBIT; V3%"z  
     break; h28")c.pH=  
    case VK_CONTROL: gyqM&5b  
     MaskBits|=CTRLBIT; rToZN!q\S  
     break; .\r=1HZ3  
    case VK_SHIFT: /.Yf&2X\  
     MaskBits|=SHIFTBIT; gB4&pPN  
     break; iV h^;  
    default: //judge the key and send message "m*.kB)e7  
     break; ?hpT"N,hF9  
   } \#LkzN8  
   for(int index=0;index<MAX_KEY;index++){ yc4?'k!  
    if(hCallWnd[index]==NULL) -__RFxG  
     continue; 2TH13k$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >FO4]  
    { 3\x@G)1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); `Gct_6  
     bProcessed=TRUE; 2K^D%U  
    } sVk+E'q  
   } qPh @Bl3  
  } I r8,=  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 .hBq1p  
   for(int index=0;index<MAX_KEY;index++){ G?:{9. (  
    if(hCallWnd[index]==NULL) b2}>{Li0  
     continue; W62 $ HI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) N_dHPa  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); uvN Lm]*  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 XRZj+muTZ  
   } 1&zvf4  
  } cT2&nZ  
 } ^?pf.E!F`  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ;[-OMGr]#  
} <evvNSE  
[]i/\0C^  
  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: {FYWQ!L  
;E Z5/"T  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); LAe>XF-5  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); N$\'X<{  
KpHt(>NR  
  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: p~Tp=d)/  
glMYEGz6p  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) jZjWz1+  
{ [}xVz"8V  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) r]e1a\)r  
 { ,2t|(V*"&  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 $8/=@E{51  
  SaveBmp(); baLO~C  
  return FALSE; ?vmu,y  
 } L<t>o":o  
 …… //其它处理及默认处理 n$2Ia E;v  
} W<f-  
gN,O)@N'd3  
&cZQ,o  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 #?x!:i$-  
Ck:RlF[6C  
  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。 2TFb!?/RQ  
r] h>Bb  
  二、编程步骤 '}4z=f`}  
mS\ gh)<h  
  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"; OyI?P_0u  
`,lm:x+(0  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; o#"U8N%r  
KCBA`N8  
  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; L/ L#[  
z7vc|Z|  
  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; \9HpbCHr  
:G.u{cw  
  5、 添加代码,编译运行程序。 (p19"p  
oo+i3af&7  
三、程序代码 PK C}!>2  
WqX$;' }h  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL UL{+mp  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 0+-"9pED>E  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ M =/+q  
#if _MSC_VER > 1000 QN4{xf:}S  
#pragma once .uh>S!X, ]  
#endif // _MSC_VER > 1000 ]%%I=r  
#ifndef __AFXWIN_H__ Z\YCjs%  
#error include 'stdafx.h' before including this file for PCH 7 XNZEi9o  
#endif Ow#a|@  
#include "resource.h" // main symbols ]_"c_QG  
class CHookApp : public CWinApp X!aC6gujOH  
{ (:(Im k;9  
 public: _i3?;Fds  
  CHookApp(); M]Kx g;  
  // Overrides :P2{^0$  
  // ClassWizard generated virtual function overrides :VkuK@Th`  
  //{{AFX_VIRTUAL(CHookApp) c -sc*.&  
 public: 8+* 1s7{  
  virtual BOOL InitInstance(); v}cTS@0  
  virtual int ExitInstance(); ?\Bm>p% +  
  //}}AFX_VIRTUAL p*NKM} ]I  
  //{{AFX_MSG(CHookApp) MG}rvzn@  
  // NOTE - the ClassWizard will add and remove member functions here. V=i/cI\  
  // DO NOT EDIT what you see in these blocks of generated code ! Cs!z3QU  
  //}}AFX_MSG w"Q/ 6#!K  
  DECLARE_MESSAGE_MAP() 1"\^@qRv#  
}; 9QXBz=Fnf  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); +YJpVxYmZ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); HXeX !  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); BvnNAi  
BOOL InitHotkey(); <)68ol~<  
BOOL UnInit(); ym_w09   
#endif >Ut4INV  
)%+7"7.  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. #\zC|%2+z  
#include "stdafx.h" }'KHF0   
#include "hook.h" vE~>9  
#include <windowsx.h> :5'8MU  
#ifdef _DEBUG |F}6Zv  
#define new DEBUG_NEW 4)Bk:K  
#undef THIS_FILE .5^7Jwh  
static char THIS_FILE[] = __FILE__; i5*BZv>e  
#endif ]/#3 P  
#define MAX_KEY 100 yI{4h $c  
#define CTRLBIT 0x04 `o4%UkBpM  
#define ALTBIT 0x02 N,3 )`Vm  
#define SHIFTBIT 0x01 DqJzsk'd3  
#pragma data_seg("shareddata") "C]v   
HHOOK hHook =NULL; c]/X >8;  
UINT nHookCount =0; B*@0l:  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey F(; =^w  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT e"d-$$'e  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey NiSybyR$  
static int KeyCount =0; -=InGm\Y  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 20,}T)}Tm  
#pragma data_seg() \H4$9lPk  
HINSTANCE hins; cU|tG!Ij?  
void VerifyWindow(); 1CR)1H  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) !hugn6  
//{{AFX_MSG_MAP(CHookApp) f-BPT2U+  
// NOTE - the ClassWizard will add and remove mapping macros here. O}-+o1  
// DO NOT EDIT what you see in these blocks of generated code! shZEE2Dr  
//}}AFX_MSG_MAP "$I8EW/1  
END_MESSAGE_MAP() \S_o{0ZY}  
:!QT ,  
CHookApp::CHookApp() 5M&<tj/[a0  
{ 6no&2a|D  
 // TODO: add construction code here, iw{rns  
 // Place all significant initialization in InitInstance BhzcimC)  
} LOEiV  
~]Weyb[ N  
CHookApp theApp; ["H2H rI2  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) cK1 Fv6V#  
{ 4n0Iw  I  
 BOOL bProcessed=FALSE; Krd0Gc~\|  
 if(HC_ACTION==nCode) wBlo2WY  
 { wZg~k\_lF  
  if((lParam&0xc0000000)==0xc0000000){// Key up {00Qg{;K|  
   switch(wParam) Z [YSE T  
   { Kgw, ]E&7  
    case VK_MENU: s?Z{LWZ@  
     MaskBits&=~ALTBIT; p_B5fm7#6W  
     break; XY,!vLjL  
    case VK_CONTROL: M^&^g  
     MaskBits&=~CTRLBIT; 2 {xf{)hO?  
     break; ?~3Pydrb#  
    case VK_SHIFT: ^2`*1el  
     MaskBits&=~SHIFTBIT; 7o7*g 7  
     break; |/X+2K}3  
    default: //judge the key and send message C <d]0)  
     break; [{q])P;  
   } tiPZ.a~k  
   for(int index=0;index<MAX_KEY;index++){ P r2WF~NuO  
    if(hCallWnd[index]==NULL) Ou]!@s  
     continue; V` 4/oM`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 3z0 %uY[e  
    { nC}Y+_wo0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); G.:QA}FE'  
     bProcessed=TRUE; >x*ef]aS  
    } f+%s.[;A  
   } Ys>Z=Eky  
  } w\1K.j=>|N  
  else if((lParam&0xc000ffff)==1){ //Key down lNo]]a+_  
   switch(wParam) x"P@[T  
   { Sg< B+u\\  
    case VK_MENU: ^4C djMF-E  
     MaskBits|=ALTBIT; f2 ?01PM,Q  
     break; &9EcgazV  
    case VK_CONTROL: 2-%9k)KH  
     MaskBits|=CTRLBIT; wW, n~W  
     break; tfdb9# &?  
    case VK_SHIFT: 48)D%867.;  
     MaskBits|=SHIFTBIT; gLwrYG7@  
     break; .1:B\ R((  
    default: //judge the key and send message @5h(bLEP  
     break; ;TL>{"z`x  
   } GE*%I1?]  
   for(int index=0;index<MAX_KEY;index++) v(]dIH  
   { y`Zn{mQ@[  
    if(hCallWnd[index]==NULL) 98*C/=^TH{  
     continue; 6lm<>#_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) moCR64n  
    { M Al4g+es  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); YRyaOrl$<  
     bProcessed=TRUE; skF}_  
    } '3=@UBs  
   } a(AYY<g  
  } P@0J!  
  if(!bProcessed){ ?&D.b$  
   for(int index=0;index<MAX_KEY;index++){ pHKc9VC  
    if(hCallWnd[index]==NULL) hm0MO,i"  
     continue; ~{ucr#]C  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) FK @Gd)(  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Mu@(^zW  
   } ;NF:98  
  } !8|?0>3)  
 } K?Jo"oy7  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); \;1nEjIA  
} m U= 3w  
#kgLdd"  
BOOL InitHotkey() h\4enu9[RL  
{ z,RjQTd  
 if(hHook!=NULL){ "%w E>E  
  nHookCount++; C8O<fwNM  
  return TRUE; qG3MyK%O\  
 } <l< y R?  
 else C6qGCzlG`  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); i)(-Ad_  
  if(hHook!=NULL) HfEl TC:3f  
   nHookCount++; =vsvx{o?  
  return (hHook!=NULL); (gUVZeVFP  
} _QneaPm%  
BOOL UnInit() q}C;~nMD  
{ !$p E=~1C  
 if(nHookCount>1){ %zN~%mJG  
  nHookCount--; ^fP5@T*f  
  return TRUE; M4e8PRlI  
 } ,4r 4 <  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 0 *]ZC'pm  
 if(unhooked==TRUE){ PnH5[4&k  
  nHookCount=0; L-Mf{z  
  hHook=NULL; |Y30B,=M  
 } ^nLk{<D35  
 return unhooked; ~&WBA]w'+  
} *9US>mVy  
q! WiX|P  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) kR <\iT0j  
{ 5Vr#>W  
 BOOL bAdded=FALSE; 'VV"$`Fu"  
 for(int index=0;index<MAX_KEY;index++){ <CWOx&hr  
  if(hCallWnd[index]==0){ tlgg~MViS  
   hCallWnd[index]=hWnd; ^*F'[!. p  
   HotKey[index]=cKey; zqLOwzMlLx  
   HotKeyMask[index]=cMask; {[bB$~7Eu  
   bAdded=TRUE; U.1&'U*  
   KeyCount++; P&Wf.qr{:  
   break; @v/ 8}n  
  } Ej<`HbJ 'Q  
 } FAq9G-\B  
 return bAdded; '`&b1Rc  
} #'I<q  
gR wRhA/  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) >:0^v'[  
{ =WK's8FB;8  
 BOOL bRemoved=FALSE; "Mh}n-oju  
 for(int index=0;index<MAX_KEY;index++){ p+CK+m   
  if(hCallWnd[index]==hWnd){ ,Y@4d79  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ /}S1e P6  
    hCallWnd[index]=NULL; EQX?Zs?C  
    HotKey[index]=0; = cI> {  
    HotKeyMask[index]=0; [x0*x~1B  
    bRemoved=TRUE; w}U'>fj  
    KeyCount--; cRSgP{hy  
    break; %F(lq*8X  
   } <FwAV=}6p  
  } cK75Chsu  
 } SKo*8r   
 return bRemoved;  5s<.qDc  
} N~DO_^  
C\* 0621  
void VerifyWindow() OKnpG*)u=g  
{ &<# ,J4  
 for(int i=0;i<MAX_KEY;i++){ Hi&bNM>?O  
  if(hCallWnd!=NULL){ !3\( d{  
   if(!IsWindow(hCallWnd)){ ySH io;g9  
    hCallWnd=NULL; vAtR\ Vh  
    HotKey=0; :JK+V2B$H  
    HotKeyMask=0; Q@rlqWgU ~  
    KeyCount--; eY_BECJ+OO  
   }  /EwNMU*6  
  } #yOeL3|b'  
 } Ll`nO;h  
} \F<C$cys\  
Wv30;7~  
BOOL CHookApp::InitInstance() nbBox,zW  
{ y 27MG  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); `&J=3x  
 hins=AfxGetInstanceHandle(); 70Ei<  
 InitHotkey(); @1V?94T1  
 return CWinApp::InitInstance(); }BiA@n,  
} d6A+pa'2  
k"+/DK,:  
int CHookApp::ExitInstance() *enT2Q  
{ CL5t6D9Qi  
 VerifyWindow(); 5oR)  
 UnInit(); C <H$}f  
 return CWinApp::ExitInstance(); :!fU+2$`^(  
} W\O.[7JP  
*7C l1o  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file bK|nxL  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) uP1]EA  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ `)M&^Z=D  
#if _MSC_VER > 1000 ]E1|^[y  
#pragma once -uB*E1|Q  
#endif // _MSC_VER > 1000 6\m'MV`R!  
&zHY0fxX  
class CCaptureDlg : public CDialog fjHd"!)3  
{ )SfM`W)Y  
 // Construction UbP$WIrq  
 public: ;e Mb$px  
  BOOL bTray; WDh*8!)  
  BOOL bRegistered; DK<}q1xi  
  BOOL RegisterHotkey(); Obc wmL  
  UCHAR cKey; {mA#'75a#  
  UCHAR cMask; M2M&L,/O  
  void DeleteIcon(); =64Ju Wvo  
  void AddIcon(); avd`7eH2  
  UINT nCount; '3B7F5uLx"  
  void SaveBmp(); Lp{/  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor on f7V  
  // Dialog Data U)SQ3*j2D  
  //{{AFX_DATA(CCaptureDlg) :D:J_{HJ  
  enum { IDD = IDD_CAPTURE_DIALOG }; ;RW5XnVx  
  CComboBox m_Key; dDqT#N?Y  
  BOOL m_bControl; Z`ZML+;~6  
  BOOL m_bAlt; XpdjWLO]C<  
  BOOL m_bShift; $~T|v7Y%  
  CString m_Path; 2l+t-  
  CString m_Number; sfC/Q"Zs  
  //}}AFX_DATA #ihHAiy3  
  // ClassWizard generated virtual function overrides 1fV\84m^  
  //{{AFX_VIRTUAL(CCaptureDlg) JgB"N/Oz  
 public: ]GzfU'fOn|  
  virtual BOOL PreTranslateMessage(MSG* pMsg); >x${I`2w  
 protected: /[|A(,N}{  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ?aU-Y_pMe  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); E>kgEfzxP  
  //}}AFX_VIRTUAL UL3u2g;d  
  // Implementation "O%xQ N  
 protected: $3(E0\#O  
  HICON m_hIcon; 5,du2  
  // Generated message map functions vH{JLN2  
  //{{AFX_MSG(CCaptureDlg) V4|l7  
  virtual BOOL OnInitDialog(); IKnXtydeI}  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); #|6M*;lN|  
  afx_msg void OnPaint(); t8Giv89{  
  afx_msg HCURSOR OnQueryDragIcon(); 3EyVoS6D  
  virtual void OnCancel(); m"vWu0/#  
  afx_msg void OnAbout(); uD4$<rSHb  
  afx_msg void OnBrowse(); l6-%)6u>  
  afx_msg void OnChange(); j8?rMD~  
 //}}AFX_MSG Ki%RSW(_`  
 DECLARE_MESSAGE_MAP() OZno 3Hn  
}; xOc&n0}%  
#endif DC=XPn/V  
&DWSu`z  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file C 4\Q8uK  
#include "stdafx.h" Y^'mBM#j  
#include "Capture.h" Oyy E0  
#include "CaptureDlg.h" ptTp63+  
#include <windowsx.h> D=~3N  
#pragma comment(lib,"hook.lib") S{JBV@@tC  
#ifdef _DEBUG -nk0Q_7N  
#define new DEBUG_NEW Og"\@n  
#undef THIS_FILE 3Oe\l[?$;  
static char THIS_FILE[] = __FILE__; @BqSu|'Du,  
#endif A@n//AZM  
#define IDM_SHELL WM_USER+1 n<MreKixE  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); :SVWi}:Co1  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 8z* /J=n  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; g y1i%  
class CAboutDlg : public CDialog \_|r>vQ  
{ &(A'uX.>pr  
 public: EV N:3  
  CAboutDlg(); 5}`e"X  
  // Dialog Data MW)=l | G  
  //{{AFX_DATA(CAboutDlg) ?yAjxoE~?  
  enum { IDD = IDD_ABOUTBOX }; tnC,1HV0[  
  //}}AFX_DATA {_X&{dZLX  
  // ClassWizard generated virtual function overrides D<xDj#Z~1  
  //{{AFX_VIRTUAL(CAboutDlg) G":u::hR  
 protected: `MXGEJF  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support <_-8)abK  
  //}}AFX_VIRTUAL IHj9n>c)[  
  // Implementation r~T3Ieb  
 protected: CI@qT}Y_  
  //{{AFX_MSG(CAboutDlg) ?., 2EC=+  
  //}}AFX_MSG w(nQ:;oC  
  DECLARE_MESSAGE_MAP() Y!AQ7F  
}; Yx<wYzD  
m/NXifi8l  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) {iVmae  
{ xu* dPG)v  
 //{{AFX_DATA_INIT(CAboutDlg) "$|ne[b2  
 //}}AFX_DATA_INIT 1'9YY")#  
} 4z!(!J )  
q@Sj$  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) yx/.4DW1Ua  
{ 2R`}}4<Z  
 CDialog::DoDataExchange(pDX); s%t =*+L\  
 //{{AFX_DATA_MAP(CAboutDlg) *gN)a%9  
 //}}AFX_DATA_MAP t`vIcCXqyl  
} O:W4W=K  
d# q8-  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) &BQ%df<y\  
 //{{AFX_MSG_MAP(CAboutDlg) LArfX,x3i  
 // No message handlers Vc| uQ8Mi  
 //}}AFX_MSG_MAP |&H(skF_  
END_MESSAGE_MAP() p`3$NCJN  
XnV$}T:?X  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 3ypf_]<  
: CDialog(CCaptureDlg::IDD, pParent) VseeU;q  
{ s@5r}6?M  
 //{{AFX_DATA_INIT(CCaptureDlg) IP l]$j>N  
  m_bControl = FALSE; VHTr;(]hk  
  m_bAlt = FALSE; +v"%@lC};  
  m_bShift = FALSE; oHkjMqju  
  m_Path = _T("c:\\"); qn~:B7f  
  m_Number = _T("0 picture captured."); f`8mES'gc8  
  nCount=0; 5tl uS  
  bRegistered=FALSE; HDT-f9%}<4  
  bTray=FALSE; D^\2a;[AxA  
 //}}AFX_DATA_INIT 2V=bE-  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 "3:TrM$|A  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); $7bux 1L  
} glP W9q,f  
pt- 1>Ui  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) f2RIOL,  
{ o:Q.XWa@MG  
 CDialog::DoDataExchange(pDX); jd?NN:7  
 //{{AFX_DATA_MAP(CCaptureDlg) {-)*.l=  
  DDX_Control(pDX, IDC_KEY, m_Key); x>~.cey  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Q1?0 ]5  
  DDX_Check(pDX, IDC_ALT, m_bAlt); y`.m'n7>P  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ^ ]CQd   
  DDX_Text(pDX, IDC_PATH, m_Path); ,N`D{H"F  
  DDX_Text(pDX, IDC_NUMBER, m_Number); .3,6Oo  
 //}}AFX_DATA_MAP Z|qUVD5Ic  
} cp<jwcc!  
9aZ^m$tAt  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) }uk]1M2=  
//{{AFX_MSG_MAP(CCaptureDlg) 6i_dL|c  
 ON_WM_SYSCOMMAND() ;B@-RfP  
 ON_WM_PAINT() ,]|*~dd>G  
 ON_WM_QUERYDRAGICON() *'nZ|r v  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Hnc<)_DF  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 3eP7vy  
 ON_BN_CLICKED(ID_CHANGE, OnChange) SjB#"A5  
//}}AFX_MSG_MAP ]<?7Cp P  
END_MESSAGE_MAP() mL[Y{t#N  
* IBCThj  
BOOL CCaptureDlg::OnInitDialog() u3@v  
{ e&J_uG  
 CDialog::OnInitDialog(); qI#ow_lL#  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); uV+.(sjH  
 ASSERT(IDM_ABOUTBOX < 0xF000); %t<ba[9F  
 CMenu* pSysMenu = GetSystemMenu(FALSE); UV8K$n<  
 if (pSysMenu != NULL) mY !LGN  
 { q X>\*@  
  CString strAboutMenu; 7__?1n~{  
  strAboutMenu.LoadString(IDS_ABOUTBOX); >@c~M  
  if (!strAboutMenu.IsEmpty()) _4#&!b6  
  { y<A%&  
   pSysMenu->AppendMenu(MF_SEPARATOR); KHJk}]K  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 3Y+ bIz!  
  } I`8jJpGA  
 } <{UjO  
 SetIcon(m_hIcon, TRUE); // Set big icon  `Aa*}1  
 SetIcon(m_hIcon, FALSE); // Set small icon 6%RN-  
 m_Key.SetCurSel(0); ^NPbD<~Lb  
 RegisterHotkey(); H.8Vm[W  
 CMenu* pMenu=GetSystemMenu(FALSE); 58H%#3Fy  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); u}~%9Pi  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); "[BDa}Il  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ,3E9H&@j  
 return TRUE; // return TRUE unless you set the focus to a control XT0:$0F  
} t?:Q  
 V_-{TGKX  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) $(U}#[Vie  
{ 7f\@3r  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) A T'P=)F@  
 { zm('\KvT  
  CAboutDlg dlgAbout; K?:wX(JYT  
  dlgAbout.DoModal(); F_&bE@k  
 } 0[T>UEI?  
 else WbP*kV{  
 { jwd{CN%  
  CDialog::OnSysCommand(nID, lParam); &9F(uk=X  
 } T^~9'KDd  
} :[ AP^  
u  t4+c0  
void CCaptureDlg::OnPaint() `[zd  
{ ]~A<Q{  
 if (IsIconic()) ZT'Sw%U:  
 { X0"f>.Lg  
  CPaintDC dc(this); // device context for painting hpVu   
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Qo;#}%}^^  
  // Center icon in client rectangle )Mj $/  
  int cxIcon = GetSystemMetrics(SM_CXICON); ';0NWFP  
  int cyIcon = GetSystemMetrics(SM_CYICON); +)gXU Vwd  
  CRect rect; gYy9N=f+  
  GetClientRect(&rect); ko%B`  
  int x = (rect.Width() - cxIcon + 1) / 2; ';hTGLq\X  
  int y = (rect.Height() - cyIcon + 1) / 2; bhb*,iWA  
  // Draw the icon AZTn!hrU  
  dc.DrawIcon(x, y, m_hIcon); _p`@/[(|  
 } s"solPw  
 else bG6<=^  
 { G]- wN7G  
  CDialog::OnPaint(); MlM2(/ok  
 } f; "6I  
} 4fCg{  
-=A W. Z o  
HCURSOR CCaptureDlg::OnQueryDragIcon() ;dh8|ujh  
{ \O7Vo<B&D  
 return (HCURSOR) m_hIcon; "<J%@  
} 0u"/7OU  
5@{+V!o,  
void CCaptureDlg::OnCancel() Mn=5yU  
{ +.b@rU6H  
 if(bTray) )5Bkm{v3  
  DeleteIcon(); a}w%k  
  CDialog::OnCancel(); N3`W%ws`~  
} 2%DleR'i  
gxku3<S  
void CCaptureDlg::OnAbout() *!gj$GK@%  
{ ]U,K]y[Bj  
 CAboutDlg dlg; _>moza  
 dlg.DoModal(); {&Bpf K;`)  
} ;\ $P;-VY  
g}-Ch#  
void CCaptureDlg::OnBrowse() P"g Y|}|  
{ CY4_=  
 CString str; |=frsf~?  
 BROWSEINFO bi; -*K!JC-  
 char name[MAX_PATH]; `>q|_w \e  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); B~u_zZE  
 bi.hwndOwner=GetSafeHwnd(); DJ9;{,gm  
 bi.pszDisplayName=name; =!#iC?I  
 bi.lpszTitle="Select folder"; GD$jP?  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Vd{h|=J  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 'ZHu=UT7_  
 if(idl==NULL) i~IQlyGr.  
  return; B9 Dh^9?L  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Qw$"W/&X  
 str.ReleaseBuffer(); r $du-U  
 m_Path=str; FBGHVV w!  
 if(str.GetAt(str.GetLength()-1)!='\\') !7g E  
  m_Path+="\\"; 0)8QOTeT  
 UpdateData(FALSE); ItTIU  
} J L9d&7-  
p.2>- L  
void CCaptureDlg::SaveBmp() :`Kr|3bQ  
{ @HfWAFT  
 CDC dc; RT45@   
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); O8+[ )+6^  
 CBitmap bm; 4JHQ^i-aY  
 int Width=GetSystemMetrics(SM_CXSCREEN); Or9@X=C  
 int Height=GetSystemMetrics(SM_CYSCREEN); ~EU[?  
 bm.CreateCompatibleBitmap(&dc,Width,Height); f$E66yG  
 CDC tdc; 4Pljyq:  
 tdc.CreateCompatibleDC(&dc); <(JsB'TK  
 CBitmap*pOld=tdc.SelectObject(&bm); n/"T7Y\2  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 6Upg\(  
 tdc.SelectObject(pOld); {/BEO=8q2  
 BITMAP btm; dv0TJ 0%  
 bm.GetBitmap(&btm); $p4aNC  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; {zGIQG9  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); OvPy+I  
 BITMAPINFOHEADER bih; V=|^r?  
 bih.biBitCount=btm.bmBitsPixel; >:]fN61#  
 bih.biClrImportant=0; xQ7n$.?y@  
 bih.biClrUsed=0; K]bS:[34 R  
 bih.biCompression=0; Ar sMqb  
 bih.biHeight=btm.bmHeight; 34C ^vBp  
 bih.biPlanes=1; t.pg;#  
 bih.biSize=sizeof(BITMAPINFOHEADER); %6 <Pt  
 bih.biSizeImage=size; fBH&AO$Q  
 bih.biWidth=btm.bmWidth; {K'SOh H4?  
 bih.biXPelsPerMeter=0; =tcPYYD  
 bih.biYPelsPerMeter=0; Vk_*]wU  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); |Z;w k&  
 static int filecount=0; $EJ*x$  
 CString name; |?Q(4(D`*  
 name.Format("pict%04d.bmp",filecount++); .Qh8I+Q%  
 name=m_Path+name; e #^|NQ<'A  
 BITMAPFILEHEADER bfh; T , =ga  
 bfh.bfReserved1=bfh.bfReserved2=0; P&aH6*p1  
 bfh.bfType=((WORD)('M'<< 8)|'B'); >*}qGk  
 bfh.bfSize=54+size; 3i(k6)H$4  
 bfh.bfOffBits=54; MatC2-aV1  
 CFile bf; BHmA*3?  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ W7A'5  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 4Sg!NPuu7&  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); cM4?G gn  
  bf.WriteHuge(lpData,size); \|>eG u  
  bf.Close(); =zA=D.D2  
  nCount++; 1MJ]Gh]5  
 } ID+'$u &  
 GlobalFreePtr(lpData); 3r em"M  
 if(nCount==1) 29ft!R>[  
  m_Number.Format("%d picture captured.",nCount); YY!(/<VI  
 else _ga!TQ:  
  m_Number.Format("%d pictures captured.",nCount); b+p!{  
  UpdateData(FALSE); A?}OOjA  
} W? UCo6<m  
0h shHv-  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) \N#)e1.0P  
{ xN"KSQpu  
 if(pMsg -> message == WM_KEYDOWN) \Di~DN1  
 { <vt^=QA'  
  if(pMsg -> wParam == VK_ESCAPE) )dL?B9d:  
   return TRUE; rF0zGNH  
  if(pMsg -> wParam == VK_RETURN) ^RWt  
   return TRUE; P'9aZd  
 } g&0GO:F`  
 return CDialog::PreTranslateMessage(pMsg); 4_.k Q"'DH  
} J|FyY)_  
&< Gq-IN  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 1]>KuXd r  
{ IPxfjBC+J  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ oZCi_g 5i  
  SaveBmp(); g41Lh3dj  
  return FALSE; gy =`cMS@  
} `4EOy:a  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ z~ u@N9M  
 CMenu pop; !RcAJs'  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); T (2,iG8  
 CMenu*pMenu=pop.GetSubMenu(0); y]jh*KD[  
 pMenu->SetDefaultItem(ID_EXITICON); Mz++SPG7  
 CPoint pt; j [U0,]  
 GetCursorPos(&pt); c?R.SBr,'  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); _TPo=}Z  
 if(id==ID_EXITICON) jATU b-  
  DeleteIcon(); UdI>x 4bI  
 else if(id==ID_EXIT) DpS6>$v8t  
  OnCancel(); o mjLQp[%  
 return FALSE; rFy9K4D  
} Na~_=3+a  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); '6 'XBL?  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) {hg$?4IyQ  
 AddIcon(); c&Zm>Qo[  
 return res; g?$9~/h :;  
} }"&(sYQ*`  
C(0Iv[~y/  
void CCaptureDlg::AddIcon() !F<?he<U  
{ ; %Da {  
 NOTIFYICONDATA data; @E>^\!nH  
 data.cbSize=sizeof(NOTIFYICONDATA); % 9D@W*Z  
 CString tip; /3TorB~Y  
 tip.LoadString(IDS_ICONTIP); I@S<D"af  
 data.hIcon=GetIcon(0); xRY5[=97  
 data.hWnd=GetSafeHwnd(); \QMSka>  
 strcpy(data.szTip,tip); D1Sl+NOV  
 data.uCallbackMessage=IDM_SHELL; 'j3'n0o  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; P~qVr#eU  
 data.uID=98; &"kx (B  
 Shell_NotifyIcon(NIM_ADD,&data); 0 j.Sb2  
 ShowWindow(SW_HIDE); JZXc1R| 9  
 bTray=TRUE; Ksp;bfe  
} " }ZD)7K  
!>:tF,fcB  
void CCaptureDlg::DeleteIcon() =5|5j!i=q  
{ Y@4vQm+  
 NOTIFYICONDATA data; XP`kf]9  
 data.cbSize=sizeof(NOTIFYICONDATA); v4zd x)  
 data.hWnd=GetSafeHwnd(); 5,c`  
 data.uID=98; u9gr@06  
 Shell_NotifyIcon(NIM_DELETE,&data); *"CvB{XF&Z  
 ShowWindow(SW_SHOW); lhI;K4#  
 SetForegroundWindow(); IcoL/7k3  
 ShowWindow(SW_SHOWNORMAL); Td  F<  
 bTray=FALSE; %xfy\of+Nk  
} j&Aq^aI  
4AM*KI  
void CCaptureDlg::OnChange() P8VU&b\  
{ `l+SJLyJ%  
 RegisterHotkey(); []]3"n  
} @ tIB'|O  
`@e H4}L*  
BOOL CCaptureDlg::RegisterHotkey() ( 7?%Hg  
{ fA8+SaXW%  
 UpdateData(); Fq9[:  
 UCHAR mask=0; 9vbh5xX   
 UCHAR key=0; 0hkuBQb\  
 if(m_bControl) u .2sB6}  
  mask|=4; W$JA4O>b  
 if(m_bAlt) 'MUrszOO.e  
  mask|=2; qc6IH9i`  
 if(m_bShift) %yMzgk[u  
  mask|=1; `-H:j:U{  
  key=Key_Table[m_Key.GetCurSel()]; YzZF^q^I  
 if(bRegistered){ .HBvs=i  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); (6BCFl:/Q<  
  bRegistered=FALSE; *e6|SZ &3  
 } ger<JSL%  
 cMask=mask; 1pb;A;F,A  
 cKey=key; 0uz"}v)  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ffM(il/2  
 return bRegistered; _6m3$k_[MJ  
} @EY}iK~  
QB[s8"S  
  四、小结 I5L7BTe  
#I?iR 3u  
  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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