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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: ;V4f6[<]'z  
  E=l^&[dIl  
  一、实现方法 ~ tqDh(  
]}BT'fky#  
  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: t+n+_X  
~Q5 i0s%  
#pragma data_seg("shareddata") >Q|S#(c  
HHOOK hHook =NULL; //钩子句柄 =%9j8wHX  
UINT nHookCount =0; //挂接的程序数目 ]D|Hq4ug  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 N"2P]Z r  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 x: 2 o$+v3  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey .$"69[1H  
static int KeyCount =0; \rmge4`4  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 2-gI@8NPI  
#pragma data_seg() TRQH{O\O  
&y.6Hiy&  
  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。 )[5.*g@  
f=nVK4DuZ  
  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: ~9dAoILrl  
G0v<`/|>}  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR sQ%gf  
cKey,UCHAR cMask) BY??X=  
{ n; *W#c  
 BOOL bAdded=FALSE; 3+iQct[  
 for(int index=0;index<MAX_KEY;index++){ S$i3/t  
  if(hCallWnd[index]==0){ ,98`tB0  
   hCallWnd[index]=hWnd; vaj-|&  
   HotKey[index]=cKey; nh%Q";  
   HotKeyMask[index]=cMask; t}-rN5GO  
   bAdded=TRUE; D2Dk7//82Y  
   KeyCount++; G:{\-R'  
   break; r#/Bz5Jb*  
  } C07U.nzh  
 } ftbOvG/ I  
 return bAdded; zNJ-JIo%  
} rqYx\i?  
//删除热键 !!UQ,yU  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) CFiO+p&  
{ I07_o"3>qr  
 BOOL bRemoved=FALSE; )` 90*  
 for(int index=0;index<MAX_KEY;index++){ Ss#UX_DT_  
  if(hCallWnd[index]==hWnd){ IT\ x0b cv  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ O_y?53X  
    hCallWnd[index]=NULL; f`8mES'gc8  
    HotKey[index]=0; "SN+ ^`  
    HotKeyMask[index]=0; 5tl uS  
    bRemoved=TRUE; HDT-f9%}<4  
    KeyCount--; D^\2a;[AxA  
    break; 2V=bE-  
   } "3:TrM$|A  
  } $7bux 1L  
 } glP W9q,f  
 return bRemoved; L=5Fvm  
} t+Hx&_pMj  
y7Sj^muBY  
m6M:l"u  
  DLL中的钩子函数如下: Zywx.@!  
]eIV'lP,j/  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ~3s\Q%   
{ =hB0p^a  
 BOOL bProcessed=FALSE; 7NDjXcuq  
 if(HC_ACTION==nCode) U Zc%XZ`"V  
 { [49Ae2W`  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ${)s ~[  
   switch(wParam) hDHIi\%  
   {  # dxS QmG  
    case VK_MENU: txXt<]N  
     MaskBits&=~ALTBIT; 9EKc{1 z  
     break; 6`;+|H<$  
    case VK_CONTROL: HVK./y qy  
     MaskBits&=~CTRLBIT; :_"%o=  
     break; yaKw/vV  
    case VK_SHIFT: bcC+af0L  
     MaskBits&=~SHIFTBIT; n 0CS =  
     break; r&c31k]E  
    default: //judge the key and send message Z7Xic5PI{4  
     break; eFdN"8EW  
   } YR}By;Bq  
   for(int index=0;index<MAX_KEY;index++){ L% ?3VW  
    if(hCallWnd[index]==NULL) ##clReS  
     continue; XbKNH>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Ba /^CS  
    { JLH,:2  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); YN 31Lo  
     bProcessed=TRUE; A J"/T+g_  
    } RTRi{p  
   } <<.%Gk  
  } {Qr0pjE7R  
  else if((lParam&0xc000ffff)==1){ //有键按下 >@c~M  
   switch(wParam) u#`FkuE\}  
   { ;f)o_:(JJ  
    case VK_MENU: E5F0C]hq  
     MaskBits|=ALTBIT; ![a~y`<K,  
     break; rYwUD7ip  
    case VK_CONTROL: '`fz|.|cbB  
     MaskBits|=CTRLBIT; <tp#KZE  
     break; u.Z,HsEOb  
    case VK_SHIFT: @O%d2bgEWV  
     MaskBits|=SHIFTBIT; ;IYH5sG{  
     break; KK4"H]!.  
    default: //judge the key and send message .WT^L2l%  
     break; kw.IVz<  
   } mFXkrvOf,  
   for(int index=0;index<MAX_KEY;index++){ K7N.gT*4  
    if(hCallWnd[index]==NULL) [.`%]Z(  
     continue; q^k]e{PD  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))  @M E .  
    { N_Y*Z`Xb  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); /l@h[}g+d-  
     bProcessed=TRUE; 2>!? EIE7  
    } EU"J'?  
   } CiSl 0  
  } Yab=p 9V;;  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ~ GW8|tw  
   for(int index=0;index<MAX_KEY;index++){ eq#x~O4  
    if(hCallWnd[index]==NULL) -L%2*`-L$  
     continue; j1{\nP/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Om=*b#k  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Zc9j_.?*  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 dn)pVti_  
   } }^R_8{>k  
  } Jf{ M[ z  
 } r(::3TF%#q  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); --9Z  
} Nu%:7  
hfuGCD6F`  
  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: 'N?t=A  
3@7<e~f  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); -d8||X[  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); M?fRiOj  
/K@{(=n  
  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: ?dcR!-3  
q"Z!}^{  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 6Y[|xu:N8Y  
{ WDdp(<  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) k;9"L90  
 { 2og8VI  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 =!cI@TI  
  SaveBmp(); t|Ipxk.)  
  return FALSE; >)IXc<"wq  
 } 7berkU0P  
 …… //其它处理及默认处理 5h4E>LB.B  
} %Fg}"=f1  
g}]EIv{  
XN=Cq*3}  
  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。 66+y@l1  
t9Nu4yl  
  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。 * (4TasQu  
Y/1,%8n  
  二、编程步骤 o-D,K dY  
Iu -CXc  
  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"; AIXvS*Y,  
WZ<kk T  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; OLdD3OI  
,t]qe  
  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; <15POB  
%$l^C!qcY  
  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; 8uO@S*)0  
qWzzUM1=  
  5、 添加代码,编译运行程序。 l^IPN 'O@  
{vJ)!'Eh  
三、程序代码 _>moza  
7Z;w<b~  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL s;0eD5b>x  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) g#ZuRL  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ !^|%Z  
#if _MSC_VER > 1000 VnJ-nfA  
#pragma once vsM] <t  
#endif // _MSC_VER > 1000 !j3V'XU#Zn  
#ifndef __AFXWIN_H__ IHg)xZ  
#error include 'stdafx.h' before including this file for PCH L#`9# Q  
#endif v0dFP0.;&  
#include "resource.h" // main symbols f~.w2Cna  
class CHookApp : public CWinApp /~LXY< -(  
{ ecH-JPm'  
 public: ClHaR  
  CHookApp(); H<SL=mb;  
  // Overrides p ]zYj >e  
  // ClassWizard generated virtual function overrides 47iwb  
  //{{AFX_VIRTUAL(CHookApp) #dLp<l)  
 public: $DfaW3bJ  
  virtual BOOL InitInstance(); J\%<.S>  
  virtual int ExitInstance(); V+dfV`*k  
  //}}AFX_VIRTUAL Ur626}  
  //{{AFX_MSG(CHookApp) 4R U1tWQ%  
  // NOTE - the ClassWizard will add and remove member functions here. 8O]U&A@  
  // DO NOT EDIT what you see in these blocks of generated code ! 4nhe *ip  
  //}}AFX_MSG #&1Y!kbdd  
  DECLARE_MESSAGE_MAP() LaE;{jY  
}; %}=$HwN)  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); FNDLqf!j  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); w jmZ`UMz  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); bw7!MAXd  
BOOL InitHotkey(); LC/w".oq?  
BOOL UnInit(); ^/W 7Xd(s  
#endif tH:K6^oR  
}eX_p6bBw  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. X*~NE\  
#include "stdafx.h" @Y>3-,o,S  
#include "hook.h" +fhyw{  
#include <windowsx.h> vII8>x%*  
#ifdef _DEBUG RZfC ?  
#define new DEBUG_NEW _^RN C)ol  
#undef THIS_FILE J{mP5<8>b  
static char THIS_FILE[] = __FILE__; 4:}`X  
#endif QD:0iD?  
#define MAX_KEY 100 xLZQ\2q  
#define CTRLBIT 0x04 lxK_+fj q  
#define ALTBIT 0x02 yvxC/Jo4  
#define SHIFTBIT 0x01 6QRfju'  
#pragma data_seg("shareddata") =3=KoH/'  
HHOOK hHook =NULL; zJMKgw,i*  
UINT nHookCount =0; l\^q7cXG  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey LeW.uh3.  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT qD\%8l.]Z  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey (nrrzOax  
static int KeyCount =0; co3H=#2a  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift \i-jME(sN  
#pragma data_seg() =tcPYYD  
HINSTANCE hins; *eXO?6f%s^  
void VerifyWindow(); ^c]Sl  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) L\og`L)5\  
//{{AFX_MSG_MAP(CHookApp) B>?Y("E  
// NOTE - the ClassWizard will add and remove mapping macros here. &Jj> jCg  
// DO NOT EDIT what you see in these blocks of generated code! E|9LUPcb  
//}}AFX_MSG_MAP .bl0w"c^qq  
END_MESSAGE_MAP() }bznx[4?I  
L>UYR++<6  
CHookApp::CHookApp() A!k}  
{ =D xJt7J1  
 // TODO: add construction code here, y`Pp"!P"O  
 // Place all significant initialization in InitInstance ~~1~_0?e  
} Y%:p(f<  
lSyp k-c  
CHookApp theApp; 9L#B"lh  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) )C2d)(baEJ  
{ f 5i`B*/  
 BOOL bProcessed=FALSE; /^[)JbgB  
 if(HC_ACTION==nCode) H>XbqIkL@  
 { %Z{J=  
  if((lParam&0xc0000000)==0xc0000000){// Key up ~v>w%]  
   switch(wParam) CHpDzG>]4  
   { %,,h )9  
    case VK_MENU: t=\V&,  
     MaskBits&=~ALTBIT; %Y Rg1UKY  
     break; * Kzs(O  
    case VK_CONTROL: @@|E1'c7  
     MaskBits&=~CTRLBIT; s*CKFEb#  
     break; )+t5G>yKK  
    case VK_SHIFT: vB4cdW 2#3  
     MaskBits&=~SHIFTBIT; ap%o\&T;  
     break; ]bnxOk  
    default: //judge the key and send message Ql*/{#$  
     break; z3*G(,  
   } Y0B*.H Ae  
   for(int index=0;index<MAX_KEY;index++){ mF F]d  
    if(hCallWnd[index]==NULL) %y w*!A1  
     continue; Sw1]]-Es  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) /1li^</|p`  
    { G0s:Dum  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); A}y1v;FB  
     bProcessed=TRUE; cn\& ;55v  
    } f!$J_dz  
   } KR^peWR  
  } ^YIOS]d>8#  
  else if((lParam&0xc000ffff)==1){ //Key down .;KupQ;*  
   switch(wParam) u}%&LI`.  
   { |I\A0aa  
    case VK_MENU: ') 1sw%[2  
     MaskBits|=ALTBIT; peqFa._W  
     break; F[=m|MZb  
    case VK_CONTROL: W=EO=}l#  
     MaskBits|=CTRLBIT; UiZ61lw  
     break; Gm2rjpZeq  
    case VK_SHIFT: Y|VzeJC  
     MaskBits|=SHIFTBIT; 1M;)$m:  
     break; ~$\j$/A8/  
    default: //judge the key and send message 1UM]$$:i  
     break; .V.N^8(:a  
   } dY-a,ch"8p  
   for(int index=0;index<MAX_KEY;index++) `f'q/  
   { 78QFaN$  
    if(hCallWnd[index]==NULL) oM7^h3R  
     continue; |(P;2q4>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) CLkVe  
    { Z],"<[E  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); _5m }g!  
     bProcessed=TRUE; 8&UuwZ6i-  
    }  <aHt6s'  
   } =!CuCV7$1O  
  } 2@&|hd=-  
  if(!bProcessed){ nIi_4=Z  
   for(int index=0;index<MAX_KEY;index++){ F>b6fUtR  
    if(hCallWnd[index]==NULL) Uqpvj90sw  
     continue; 0&nF Vsz  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 654%X(:q  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); R$@.{d&:w  
   } |Gf{}  
  } {f&ga  
 } 1 I+5  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); :> q?s  
} g^C6"rsnl  
(KQt%]  
BOOL InitHotkey() =5|5j!i=q  
{ j>b OnCp~  
 if(hHook!=NULL){ r#Fu<so,  
  nHookCount++; v4zd x)  
  return TRUE; 5,c`  
 } u9gr@06  
 else >ATW/9r  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); kxmS   
  if(hHook!=NULL) |K_B{v.   
   nHookCount++; $($SQZK&  
  return (hHook!=NULL); 6'%]6"&M4  
} P&tK}Se^V  
BOOL UnInit() )g --=w3  
{ aOD"z7}U  
 if(nHookCount>1){ VxFy[rP  
  nHookCount--; ``<1Lo@  
  return TRUE; ^"l$p,P+  
 } Qm.kXlsDI  
 BOOL unhooked = UnhookWindowsHookEx(hHook); []]3"n  
 if(unhooked==TRUE){ @ tIB'|O  
  nHookCount=0; `@e H4}L*  
  hHook=NULL; E nvs[YZe  
 } 9>#|~P&FE  
 return unhooked; %KA/  
} _)l %-*Z7p  
gCJ'wv)6|%  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 84[^#ke  
{ r9Z/y*q  
 BOOL bAdded=FALSE; u7=[~l&L  
 for(int index=0;index<MAX_KEY;index++){ $;CC lzw  
  if(hCallWnd[index]==0){ kUUq9me&o  
   hCallWnd[index]=hWnd; #~x5}8  
   HotKey[index]=cKey; 1;P\mff3Y  
   HotKeyMask[index]=cMask; eI}VHBAz  
   bAdded=TRUE; HIq1/)  
   KeyCount++; ]2(c$R  
   break; EDo@J2A  
  } @(cS8%wK  
 } xB(:d'1|  
 return bAdded; x]ti3?w  
} <n\.S  
':V_V. :  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ]1&9~TL  
{ ~{+{pcO}  
 BOOL bRemoved=FALSE; h2%:;phH  
 for(int index=0;index<MAX_KEY;index++){ >.iw8#l  
  if(hCallWnd[index]==hWnd){ /=@vG Vp6  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ %&Cl@6  
    hCallWnd[index]=NULL; _o.Z`]  
    HotKey[index]=0; 4iz&"~&1  
    HotKeyMask[index]=0; ]K7  64}  
    bRemoved=TRUE;  /Xz4q!Ul  
    KeyCount--; +*J4q5;E[?  
    break; dNQSbp  
   } vy@Lu cB  
  } pD#"8h  
 } doc  
 return bRemoved; XX-T",  
} q&E5[/VK:  
(g m^o{  
void VerifyWindow() 8q3TeMYV  
{ 5Mr;6 ]I<  
 for(int i=0;i<MAX_KEY;i++){ {_Qxe1^g  
  if(hCallWnd!=NULL){ / D ]B  
   if(!IsWindow(hCallWnd)){ 3@] a#>  
    hCallWnd=NULL; \=7=>x_  
    HotKey=0; 1[l>D1F?  
    HotKeyMask=0; IBkH+j  
    KeyCount--; ? ~Zrd  
   } M@g gLW  
  } JJ?ri,  
 } d&bc>Vt  
} Z]TVH8%|k  
]7t\%_  
BOOL CHookApp::InitInstance() j#,M@CE  
{ p^rX.?X  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ~5uNw*H  
 hins=AfxGetInstanceHandle(); 6wB>-/'Y  
 InitHotkey(); 0NtsFPO  
 return CWinApp::InitInstance(); WWcm(q =  
} AtlR!I EUb  
_CJr6Evs  
int CHookApp::ExitInstance() %GbPrlu  
{ ;lH,bX~5  
 VerifyWindow(); ,R}KcZG)  
 UnInit(); "IG$VjgcB  
 return CWinApp::ExitInstance(); mzxvfXSF  
} iT5SuIv  
\~t~R q  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file '1'1T5x~  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 9! HMQ  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ .eNwC.8i  
#if _MSC_VER > 1000 s66XdM  
#pragma once ~cBc&u:"  
#endif // _MSC_VER > 1000 Z 034wn\N  
jL+}F/~r  
class CCaptureDlg : public CDialog 'uAC oME@  
{ hav?mnVJ  
 // Construction N#['fg'  
 public: +N$7=oGC  
  BOOL bTray; /v)!m&6]>  
  BOOL bRegistered; }r~l7 2 `  
  BOOL RegisterHotkey(); 'Y{ux>  
  UCHAR cKey; wT~;tOw~  
  UCHAR cMask; %4|}&,%%r  
  void DeleteIcon(); ^P g YP  
  void AddIcon(); ,XG|oo -  
  UINT nCount; M(zY[O  
  void SaveBmp(); qb> r\bc  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor T 0v@mXBQ  
  // Dialog Data ilp;@O6  
  //{{AFX_DATA(CCaptureDlg) 3ZL7N$N}7  
  enum { IDD = IDD_CAPTURE_DIALOG }; Usf"K*A  
  CComboBox m_Key; dh;MpE  
  BOOL m_bControl; 0 ,Qj:  
  BOOL m_bAlt; y?z_^ppj  
  BOOL m_bShift; gVA}?t;  
  CString m_Path; tD7C7m  
  CString m_Number; 8^/Ek<Q b|  
  //}}AFX_DATA O;BMwg_7  
  // ClassWizard generated virtual function overrides B Ff. Rd95  
  //{{AFX_VIRTUAL(CCaptureDlg) oB06{/6  
 public: 0/P-> n~  
  virtual BOOL PreTranslateMessage(MSG* pMsg); W|rFl]~a  
 protected: 5;MK1l  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support [{p?BTs  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); -)a_ub  
  //}}AFX_VIRTUAL 8pL>wL &C  
  // Implementation e4YfT r  
 protected: pL}j ZTo  
  HICON m_hIcon; FHNuMdFn  
  // Generated message map functions Rc:cVK  
  //{{AFX_MSG(CCaptureDlg) M |Q  
  virtual BOOL OnInitDialog(); ";?C4%L  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); EM 54  
  afx_msg void OnPaint(); wy_;+ 'Y  
  afx_msg HCURSOR OnQueryDragIcon(); e|5B1rMM  
  virtual void OnCancel(); tct 5*.|  
  afx_msg void OnAbout(); =PKt09b^  
  afx_msg void OnBrowse(); ssX6kgq_(  
  afx_msg void OnChange(); @)Hbgkdi  
 //}}AFX_MSG zGL<m0C  
 DECLARE_MESSAGE_MAP() 2mG&@E  
}; hXQg=Sj  
#endif $:u7Dv}\  
3@TG.)N4  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file C*y6~AYN#  
#include "stdafx.h" r< ?o}Qq  
#include "Capture.h" O{ %A&Ui  
#include "CaptureDlg.h" 0]eh>ab>  
#include <windowsx.h> $, &g AU  
#pragma comment(lib,"hook.lib") :^-HVT)qF  
#ifdef _DEBUG ? W2I1HEy  
#define new DEBUG_NEW t`8e#n 9  
#undef THIS_FILE \|pK Z6*s  
static char THIS_FILE[] = __FILE__; wO_pcNYZ8  
#endif A.$VM#  
#define IDM_SHELL WM_USER+1 RZ)vU'@kx  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1f@U :<:  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); d%_78nOh"  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Qk~0a?#y5  
class CAboutDlg : public CDialog $-fjrQ  
{ 0 bPJEEd  
 public: k$0|^GL8  
  CAboutDlg(); i_9Cc$Qh<  
  // Dialog Data 9B#)h)h(=  
  //{{AFX_DATA(CAboutDlg) PD}SPOA`U3  
  enum { IDD = IDD_ABOUTBOX }; cGpN4|*rQ  
  //}}AFX_DATA q0b`HD  
  // ClassWizard generated virtual function overrides !|Xl 8lV`  
  //{{AFX_VIRTUAL(CAboutDlg) :L [YmZ  
 protected: )kL` &+#>  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Bgk~R.l  
  //}}AFX_VIRTUAL 9-a2L JI  
  // Implementation im4e!gRE  
 protected: .sJys SA\  
  //{{AFX_MSG(CAboutDlg) 0.u9f`04  
  //}}AFX_MSG TM/|K|_  
  DECLARE_MESSAGE_MAP() x<{;1F,k3  
}; &w;^m/zP3  
> G4HZE  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 5}X<(q(  
{ anz9lGG#  
 //{{AFX_DATA_INIT(CAboutDlg) N.5KPAvg%  
 //}}AFX_DATA_INIT 7>t$<J  
} nv_m!JG7  
STXqq[+Rf  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) gf3u0' $  
{ <(#xOe  
 CDialog::DoDataExchange(pDX); N'eQ>2>O@  
 //{{AFX_DATA_MAP(CAboutDlg) 2sd ) w  
 //}}AFX_DATA_MAP s.p1L  
} eHR&N.2  
<i:*p1#Bm  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) hyk|+z`B  
 //{{AFX_MSG_MAP(CAboutDlg) H)j [eZP  
 // No message handlers _>jrlIfc  
 //}}AFX_MSG_MAP a9? v\hG  
END_MESSAGE_MAP() &e HM#as  
KD%xo/Z.  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) EU^}NZW&v:  
: CDialog(CCaptureDlg::IDD, pParent) cwM#X;FGq  
{ !!-}ttFA  
 //{{AFX_DATA_INIT(CCaptureDlg) h7de9Rt  
  m_bControl = FALSE; ) 8x:x7?  
  m_bAlt = FALSE; .y %pGi  
  m_bShift = FALSE; M 9(ez7Z  
  m_Path = _T("c:\\"); { .aK{ V  
  m_Number = _T("0 picture captured."); W2F +^  
  nCount=0; Nh1e1m?  
  bRegistered=FALSE; 0okO+QU,a  
  bTray=FALSE; ;B|^2i1Wi  
 //}}AFX_DATA_INIT #uD)0zdw  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32  Vp(D|}P  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 8m/FKO (r  
} hapB! ~M?  
TdNuD V  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Xb(CH#*{z  
{ w&wA >q>&  
 CDialog::DoDataExchange(pDX); 1EC-e|M.  
 //{{AFX_DATA_MAP(CCaptureDlg) `uIx/.L  
  DDX_Control(pDX, IDC_KEY, m_Key); Qfkh0DX B  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); (aDb^(]>  
  DDX_Check(pDX, IDC_ALT, m_bAlt); >0Fxyv8  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 1AV1d%F  
  DDX_Text(pDX, IDC_PATH, m_Path); g{g`YvLu^  
  DDX_Text(pDX, IDC_NUMBER, m_Number); gZ`32fB%  
 //}}AFX_DATA_MAP Gsds!z$  
} 0v_6cYA  
R/ ALR  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) z9k*1:  
//{{AFX_MSG_MAP(CCaptureDlg) b"ol\&1 #  
 ON_WM_SYSCOMMAND() r,`Z.A  
 ON_WM_PAINT() y'J:?!S,Yu  
 ON_WM_QUERYDRAGICON() (xk.NZn F  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) `DgaO-Dg3  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) #Acon7R p  
 ON_BN_CLICKED(ID_CHANGE, OnChange) (TT3(|v  
//}}AFX_MSG_MAP L?=#*4t  
END_MESSAGE_MAP() Tm%$J  
fs2m N1  
BOOL CCaptureDlg::OnInitDialog() XPHQAo[(s  
{ r.^0!(d  
 CDialog::OnInitDialog(); PtQQZ"ept  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); k%EWkM)?  
 ASSERT(IDM_ABOUTBOX < 0xF000); egZyng pB  
 CMenu* pSysMenu = GetSystemMenu(FALSE); V;>9&'Z3  
 if (pSysMenu != NULL) L Yh@ u1p  
 { pchQ#GU  
  CString strAboutMenu; 4o1Q7  
  strAboutMenu.LoadString(IDS_ABOUTBOX); :0 W6uFNOU  
  if (!strAboutMenu.IsEmpty()) tx^92R2/  
  { +Od1)_'\D3  
   pSysMenu->AppendMenu(MF_SEPARATOR); *A~($ZtL  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ;jRL3gAe)  
  } b\SXZN)Be  
 } {c v;w  
 SetIcon(m_hIcon, TRUE); // Set big icon 6V'wQqJ  
 SetIcon(m_hIcon, FALSE); // Set small icon QRsqPh&-  
 m_Key.SetCurSel(0); ;Ri 3#*a=  
 RegisterHotkey(); ~v.jZ/h  
 CMenu* pMenu=GetSystemMenu(FALSE); RpHpMtvNo/  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); <MPeh&_3#  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); f|- m ^/y  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); /HB+ami,  
 return TRUE; // return TRUE unless you set the focus to a control (\Rwf}gyR  
} C/mg46 v2W  
IV)^;i  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) pY^pTWs(  
{ AC 9{*K[  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ggerh#  
 { 7[ZkM+z!  
  CAboutDlg dlgAbout; r/UYC"K3  
  dlgAbout.DoModal(); R'S c  
 } l\K%  
 else Cr' ! "F  
 { kR<xtHW  
  CDialog::OnSysCommand(nID, lParam); +:Lk^Ny  
 } NzjMk4t  
} ?cqicN.+6  
gJ]Cq/gC  
void CCaptureDlg::OnPaint() DBQOxryP>o  
{ 5."5IjZu  
 if (IsIconic()) {F;,7Kn+l  
 { X}3P1.n:  
  CPaintDC dc(this); // device context for painting ]WTf< W<  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ]O6KKz  
  // Center icon in client rectangle x7vq?fP0n  
  int cxIcon = GetSystemMetrics(SM_CXICON); XxmJP5  
  int cyIcon = GetSystemMetrics(SM_CYICON); "nVK< Vd  
  CRect rect; K5P Gi#  
  GetClientRect(&rect); p@#]mVJ>9  
  int x = (rect.Width() - cxIcon + 1) / 2; !nec 7  
  int y = (rect.Height() - cyIcon + 1) / 2; gE\A9L~b  
  // Draw the icon IM@"AD52a  
  dc.DrawIcon(x, y, m_hIcon); W;^Rx.W  
 } "4 'kb  
 else G1kDM.L  
 { l<u{6o  
  CDialog::OnPaint(); }16&1@8  
 } l*$WX=h6n  
} ?g5iok {  
WLE%d]'%M  
HCURSOR CCaptureDlg::OnQueryDragIcon() 5i^`vmK  
{ \M+MDT&  
 return (HCURSOR) m_hIcon; gdOe)il\  
} 0LS -i%0  
{?w"hjy  
void CCaptureDlg::OnCancel() MKomq  
{ BqQ] x'AF  
 if(bTray) ||R0U@F,  
  DeleteIcon(); R78!x*U}  
  CDialog::OnCancel(); 3 t/ R2M  
} 6hp{,8|D"m  
I|H,)!Z  
void CCaptureDlg::OnAbout() 5i|s>pD4z1  
{ ):/,w!1  
 CAboutDlg dlg;  ~q*i;*  
 dlg.DoModal(); DLU[<! C  
} l+t #"3  
;?0_Q3IML  
void CCaptureDlg::OnBrowse() UMT\Q6p  
{ k}X[u8A  
 CString str; xM% pvx.'L  
 BROWSEINFO bi; 9H>BWjS  
 char name[MAX_PATH]; +eU`H[iu  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ?2/uSG|  
 bi.hwndOwner=GetSafeHwnd(); =D{B}=D\IM  
 bi.pszDisplayName=name; kzMa+(fu  
 bi.lpszTitle="Select folder"; YbzM6u2  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; j+$ M?Z^  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); oE$hqd s  
 if(idl==NULL) b9`iZ  
  return; Jth=.9mrM  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); hBjVe?{  
 str.ReleaseBuffer(); ooY\t +  
 m_Path=str; aQga3;S!  
 if(str.GetAt(str.GetLength()-1)!='\\') %?Rs*-F.~1  
  m_Path+="\\"; 4e}{$s$Xx  
 UpdateData(FALSE); *vb^N0P  
} n|6?J_{<b>  
Sobtz}A*  
void CCaptureDlg::SaveBmp() 2%5?F n=  
{ 10?qjjb&  
 CDC dc; !z?0 :Jg  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); mqdOu{kQ  
 CBitmap bm;  '6O|H  
 int Width=GetSystemMetrics(SM_CXSCREEN); MvBD@`&7  
 int Height=GetSystemMetrics(SM_CYSCREEN); o/WC@!wg K  
 bm.CreateCompatibleBitmap(&dc,Width,Height); !Ri r&gF  
 CDC tdc; 8[oYZrg  
 tdc.CreateCompatibleDC(&dc); R0vww_fz  
 CBitmap*pOld=tdc.SelectObject(&bm); C>4UbU  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); m*`cuSU|o  
 tdc.SelectObject(pOld); 4\\.n  
 BITMAP btm; W,DZ ;). %  
 bm.GetBitmap(&btm); WK*S4c  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; o!=WFAi[pX  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 3B;}j/h2  
 BITMAPINFOHEADER bih; IJ0#iA. T  
 bih.biBitCount=btm.bmBitsPixel; 7RD$=?oO'  
 bih.biClrImportant=0; RE 9nU%!  
 bih.biClrUsed=0; MA$Xv`6I\  
 bih.biCompression=0; Gbn4 *<N  
 bih.biHeight=btm.bmHeight; l~rb]6E  
 bih.biPlanes=1; oKRFd_r+  
 bih.biSize=sizeof(BITMAPINFOHEADER); Rnr#$C%  
 bih.biSizeImage=size; +ZclGchw  
 bih.biWidth=btm.bmWidth; *!Y- !  
 bih.biXPelsPerMeter=0; b_|u<  
 bih.biYPelsPerMeter=0; F;pQ\Y  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); []"=]f{1};  
 static int filecount=0; !9DX=?  
 CString name; ~\ [?wN  
 name.Format("pict%04d.bmp",filecount++); p'g^Wh  
 name=m_Path+name; VRtO; F  
 BITMAPFILEHEADER bfh; IO"hF  
 bfh.bfReserved1=bfh.bfReserved2=0; )yrAov\z*  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ./7v",#*.'  
 bfh.bfSize=54+size; Sl"BK0:%7  
 bfh.bfOffBits=54; @UO}W_0ZD  
 CFile bf; \-c#jo.$8  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ :@/"abv  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); e=7W 7^"_  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER));  &+G; R  
  bf.WriteHuge(lpData,size); t7bqk!6hM\  
  bf.Close(); SRItE\"Xe  
  nCount++; ~p\n&{P0  
 } rGQ5l1</  
 GlobalFreePtr(lpData); qU-!7=}7  
 if(nCount==1) 3b@VY'P  
  m_Number.Format("%d picture captured.",nCount); };r|}v !~_  
 else 7TpRCq#  
  m_Number.Format("%d pictures captured.",nCount); c" +zgP  
  UpdateData(FALSE); Tm_8<$ 7  
} ;%Q&hwj  
' S,2  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) q$T8bh,2  
{ 4sIX O  
 if(pMsg -> message == WM_KEYDOWN) Gm A!Mo  
 { i4<BDX5  
  if(pMsg -> wParam == VK_ESCAPE) yUe+":7k.  
   return TRUE; =Dk7RKoHF  
  if(pMsg -> wParam == VK_RETURN) @\jQoaLT$_  
   return TRUE; yj zK.dM  
 } Yb 6q))Y  
 return CDialog::PreTranslateMessage(pMsg); /zT`Y=1  
} h55>{)(E  
K6B4sE  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 8teJ*sz  
{ n=o_1M|  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Za%LAyT_s  
  SaveBmp(); qjAh6Q/E`  
  return FALSE; *ik/p  
} =EpJZt  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ b#a@ rh  
 CMenu pop; 7@l<? (  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); PsbG|~  
 CMenu*pMenu=pop.GetSubMenu(0); 2h q>T&8  
 pMenu->SetDefaultItem(ID_EXITICON); !Lkm? (_  
 CPoint pt; "Pj}E=!k  
 GetCursorPos(&pt); J +q|$K6  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 8TPN#"  
 if(id==ID_EXITICON) zCV7%,H~  
  DeleteIcon(); Qx t@ V  
 else if(id==ID_EXIT) g5Td("& n  
  OnCancel(); TzKK;(GX  
 return FALSE; WYszk ,E  
} Q7GY3X*kA  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); %4,?kh``D  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) m|F:b}0Hb  
 AddIcon(); Js{= i>D  
 return res; HnU Et/  
} ,@.EpbB  
URw5U1  
void CCaptureDlg::AddIcon() $iPP|Rw  
{ !h:  Q  
 NOTIFYICONDATA data; CVQB"L  
 data.cbSize=sizeof(NOTIFYICONDATA); _kN*e:t  
 CString tip; ;GOz>pg  
 tip.LoadString(IDS_ICONTIP); NY!jwb@%  
 data.hIcon=GetIcon(0); 0+`Pg  
 data.hWnd=GetSafeHwnd(); hO( RZ '{  
 strcpy(data.szTip,tip); *||d\peQ  
 data.uCallbackMessage=IDM_SHELL; g_z/{1$  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; /S~m)$vu  
 data.uID=98; A,#2^dR  
 Shell_NotifyIcon(NIM_ADD,&data); j O8k6<l  
 ShowWindow(SW_HIDE); .=<$S#x^Hb  
 bTray=TRUE; E FY@Y[  
} PJ q yvbD  
T)SbHp Y  
void CCaptureDlg::DeleteIcon() H?Jm'\~  
{ Oy_c  
 NOTIFYICONDATA data; j@| `f((4  
 data.cbSize=sizeof(NOTIFYICONDATA); &HDP!SLS  
 data.hWnd=GetSafeHwnd(); LchnBtjn  
 data.uID=98; &tE.6^F  
 Shell_NotifyIcon(NIM_DELETE,&data); /k6fLn2;  
 ShowWindow(SW_SHOW); 'jjb[{g^}}  
 SetForegroundWindow();  CdZ BG  
 ShowWindow(SW_SHOWNORMAL); v\%G|8+]  
 bTray=FALSE; ?WFh',`:  
} | vu>;*K  
&y\sL"YL!  
void CCaptureDlg::OnChange() o#D.9K(  
{ GoE 'L  
 RegisterHotkey(); yI)~]K r  
} VKW|kU7Cs$  
s>%Pd7:  
BOOL CCaptureDlg::RegisterHotkey() T ):SGW  
{ 1RqgMMJL  
 UpdateData(); ax|1b`XUr"  
 UCHAR mask=0; k;Fh4Hv  
 UCHAR key=0; Zj VWxQ  
 if(m_bControl) (OmH~lSO.  
  mask|=4; #YK5WTn5  
 if(m_bAlt) e@n!x}t8  
  mask|=2; L?RF;jf  
 if(m_bShift) 2R.2D'4)`  
  mask|=1; UVEz;<5@\  
  key=Key_Table[m_Key.GetCurSel()]; ]R IVc3?;$  
 if(bRegistered){ xf,5R9g/  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); W?XizTW  
  bRegistered=FALSE; 1*Ar{:+ua  
 } %b}gDWs  
 cMask=mask; Q8qz*v]{  
 cKey=key; uk7'K 0j  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); lMifpK  
 return bRegistered; WsOi,oG@  
} t"AzI8O  
} !s!;BOx  
  四、小结 ycr"Y|  
Wa'sZ#  
  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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