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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: r m\]  
  g2BE-0,R  
  一、实现方法 RQ!kVM@  
=J<3B H^m  
  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: c7,p5[  
Qne@Vf kA  
#pragma data_seg("shareddata") bRfac/:}  
HHOOK hHook =NULL; //钩子句柄 ={B%qq  
UINT nHookCount =0; //挂接的程序数目 9J$N5  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 lE'2\kxI?  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 /*i[MB  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey KZ>cfv-&a  
static int KeyCount =0; u{o3  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 RGf&KV/  
#pragma data_seg() RG0kOw0  
-LhO </l  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 J<yt/V]  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: eD 4X:^@  
e?,n>  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 58V`I5_  
cKey,UCHAR cMask) <Y:{>=  
{ r roI  
 BOOL bAdded=FALSE; e ^2n58  
 for(int index=0;index<MAX_KEY;index++){ +Hgil  
  if(hCallWnd[index]==0){ _ VKBzOH  
   hCallWnd[index]=hWnd; C6Lc   
   HotKey[index]=cKey; =;ClOy9  
   HotKeyMask[index]=cMask; <Z5-?wgf9  
   bAdded=TRUE; j4k\5~yzS  
   KeyCount++; 41Hv)}Yd  
   break; e#!%:M;4P  
  } %|AebxB'o  
 } m}hEi  
 return bAdded; ^CO{86V  
} xhK8Q  
//删除热键 XXPn)kmWR  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) +saXN6  
{ ;-#2p^  
 BOOL bRemoved=FALSE; %PM&`c98z7  
 for(int index=0;index<MAX_KEY;index++){ "ngULpb{R  
  if(hCallWnd[index]==hWnd){ !K*(# [  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ {7'Wi$^F  
    hCallWnd[index]=NULL; }IEwGoDwNs  
    HotKey[index]=0; WX6}@mS.  
    HotKeyMask[index]=0; %;_94!(hC  
    bRemoved=TRUE; Xdh2  
    KeyCount--; ^F,sV*  
    break; 2. '` mGu  
   } B>.x@(}V~  
  } & OYo  
 } ORuC("  
 return bRemoved; K*I!:1;3N  
} UE8j8U'L  
@GUlw[vi  
ZP{<f~;  
  DLL中的钩子函数如下: 4Hy/K^Ci  
7zM9K+3L  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) HxSq &j*F  
{ jaw&[f 7  
 BOOL bProcessed=FALSE; xP4}LL9)  
 if(HC_ACTION==nCode) VKV :U60  
 { (qglD  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 h4Wt oE>i  
   switch(wParam) d|?Xo\+  
   {  UodBK7y  
    case VK_MENU: v%:VV*MxF  
     MaskBits&=~ALTBIT; V'hb 4}@  
     break; ZtyDip'x  
    case VK_CONTROL: qG@YNc  
     MaskBits&=~CTRLBIT; k/P.[5  
     break; *4/FN TC  
    case VK_SHIFT: L4,b ThSG  
     MaskBits&=~SHIFTBIT; HS[($  
     break; m8@&-,T   
    default: //judge the key and send message !iO2yp  
     break; $Nd,6w*`  
   } <O5WY37"q  
   for(int index=0;index<MAX_KEY;index++){ sSd/\Ap  
    if(hCallWnd[index]==NULL) w4(L@1  
     continue; rk6K0TQ8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $=iw<B r  
    { k&2=-qgVR  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); }}"pQ!Z  
     bProcessed=TRUE; h PL]B_<  
    } }R`Rqg-W  
   } |lt]9>|  
  } ],_+J *  
  else if((lParam&0xc000ffff)==1){ //有键按下 )/?H]o$NU  
   switch(wParam) Aa=:AkrH  
   { h5SJVa  
    case VK_MENU: q.p.$)  
     MaskBits|=ALTBIT; ,jOJ\WXP  
     break; NMe{1RM  
    case VK_CONTROL: %x N${4)6  
     MaskBits|=CTRLBIT; v\GVy[Qyv  
     break; ]} dQ~lOE  
    case VK_SHIFT: om`T/@_,  
     MaskBits|=SHIFTBIT; D"rbQXR7$  
     break; #MKM.T,\t  
    default: //judge the key and send message &\1n=y  
     break; Jy5sZ }t[  
   } N+'j on}U  
   for(int index=0;index<MAX_KEY;index++){ _ Ao$)Gu)  
    if(hCallWnd[index]==NULL) y(o)} m*0  
     continue; V:$+$"|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) RFMPh<Ac  
    { =e4 r=I  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); |~r-VV(=  
     bProcessed=TRUE; AH|gI2  
    } @^A5{qQ\  
   } /M_$4O;*@  
  } $c9-Q+pZ  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 )rq |t9kix  
   for(int index=0;index<MAX_KEY;index++){ >~SS^I0  
    if(hCallWnd[index]==NULL) r/2= nE  
     continue; 5?lc%,-&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 7~SwNt,  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 0?<#!  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 z$e6T&u5B  
   } 6Q^~O*cw  
  } V&w2pp0  
 } I|U'@E  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); .E<nQWz 8  
} ;$QC_l''b  
L-T,[;bl  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: DcW?L^Mst  
Ut;`6t  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); HwFX,?  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Iko]c_W0  
VG);om7`PD  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: |5bLV^mv]i  
Ttt'X<9  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) u.|Z3=?VG  
{ F!]Sr'UA  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) M2O_kO eZ  
 { q.c)>=!.  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分  Y !?'[t  
  SaveBmp(); (k?H T'3)  
  return FALSE; G3~`]qf  
 } d ~Z\%4  
 …… //其它处理及默认处理 b6bs .  
} %up?70  
;f[lq^eV  
1z? }'&:  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 l4>^79**  
{'5"i?>s0>  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 U[@y 8yN6M  
CIjc5^Y2  
  二、编程步骤 m^k0j/  
!y= R)k  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; -QrC>3xZR  
Mfj82rHg  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ,%M[$S'  
A*EOn1hN  
  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; [={mCGU  
FTf#"'O  
  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/6-j^  
# z|Q $  
  5、 添加代码,编译运行程序。 s/E|Z1pg3  
\84t\jKR  
三、程序代码 9;E=w+  
yD7BZI xW  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ;-+q*@sa]  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) or/gx3  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 1~5DIU^  
#if _MSC_VER > 1000 qN $t_  
#pragma once A&Y5z[p  
#endif // _MSC_VER > 1000 ;mkkaW,D*  
#ifndef __AFXWIN_H__ iwotEl0*{  
#error include 'stdafx.h' before including this file for PCH ,`@pi@<"#  
#endif '<R>cN"  
#include "resource.h" // main symbols YmziHns`b  
class CHookApp : public CWinApp 5(3O/C{?~  
{ $ik*!om5  
 public: P {TJ$  
  CHookApp(); cHs3:F~~  
  // Overrides /Mqhx_)>A  
  // ClassWizard generated virtual function overrides `(e :H  
  //{{AFX_VIRTUAL(CHookApp) /yOx=V  
 public: 0l!#u`cCI  
  virtual BOOL InitInstance(); Cn{Hk)6  
  virtual int ExitInstance(); l":W@R  
  //}}AFX_VIRTUAL c3$T3Lu1  
  //{{AFX_MSG(CHookApp) mj~:MCC  
  // NOTE - the ClassWizard will add and remove member functions here. LeKovt%  
  // DO NOT EDIT what you see in these blocks of generated code ! H@Dpht>[  
  //}}AFX_MSG "Ms;sdjg}&  
  DECLARE_MESSAGE_MAP() 0 j.K?]f)h  
}; E}@C4pS  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); " kDiK`i  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); >STtX6h  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); jD: N)((  
BOOL InitHotkey(); ]A*}Dem*5  
BOOL UnInit(); Q7 BbST+  
#endif fB+L%+mr8  
{&  o^p!  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. t" .Ytz>  
#include "stdafx.h" i0vm00oT  
#include "hook.h" D(!^$9e9b  
#include <windowsx.h> p4`1^}f&Ie  
#ifdef _DEBUG o NtFYY  
#define new DEBUG_NEW  : T*Q2  
#undef THIS_FILE BOs/:ZbK0W  
static char THIS_FILE[] = __FILE__; Shm> r@C?  
#endif / ^.|m3  
#define MAX_KEY 100 (WM3(US|  
#define CTRLBIT 0x04 aurs~  
#define ALTBIT 0x02 2u"lc'9v  
#define SHIFTBIT 0x01 "y1Iu   
#pragma data_seg("shareddata") YR%iZ"`*+O  
HHOOK hHook =NULL; NAbVH{*\U  
UINT nHookCount =0; dbI>\khI  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey oQ!M+sRmF  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT :E:e ^$p  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey mk-{@$QJb  
static int KeyCount =0; zWHq4@K  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift (]|h6aI'}  
#pragma data_seg() x9_mlZ  
HINSTANCE hins; Ei;tfB  
void VerifyWindow(); C|'DKT4M&  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) "yWw3(V2>  
//{{AFX_MSG_MAP(CHookApp) PRKZg]?  
// NOTE - the ClassWizard will add and remove mapping macros here. )!T~l(g  
// DO NOT EDIT what you see in these blocks of generated code! ex3Qbr  
//}}AFX_MSG_MAP *ByHTd  
END_MESSAGE_MAP() La4S/.  
v}B%:1P4  
CHookApp::CHookApp() } M#e\neii  
{ ,g*!NK_:5t  
 // TODO: add construction code here, $3-v W{<  
 // Place all significant initialization in InitInstance +>$]leqa  
} Q;h.}N8W  
oMh$:jR$  
CHookApp theApp; 0RUk^  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) $|K d<wv  
{ Knq 9 "k  
 BOOL bProcessed=FALSE; K1& QAXyP  
 if(HC_ACTION==nCode) / f%mYL  
 { yI0bSu<j-  
  if((lParam&0xc0000000)==0xc0000000){// Key up 55[ 4)*  
   switch(wParam) _( W@FS  
   { dG\ wW@}J  
    case VK_MENU: jL VJ+mu  
     MaskBits&=~ALTBIT; 1W^hPY  
     break; 6{Wo5O{!\  
    case VK_CONTROL: f :c'j`  
     MaskBits&=~CTRLBIT; aSL`yuXu  
     break; 1+l8%G=hB  
    case VK_SHIFT: u-_r2U  
     MaskBits&=~SHIFTBIT; Hbm 4oYN  
     break; ?J}Q&p.  
    default: //judge the key and send message $( hT{C,K  
     break; $] 6u#5  
   } b}e1JPk}!  
   for(int index=0;index<MAX_KEY;index++){ h$cm:uks  
    if(hCallWnd[index]==NULL) R4?>C-;  
     continue; $a(-r-_Fi]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) BZR{}Aj4pa  
    { FDHW' OP4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); LPk@t^[  
     bProcessed=TRUE; u9lZHh#V-  
    } Fq9YhR  
   } SZykG[  
  } iD^,O)b  
  else if((lParam&0xc000ffff)==1){ //Key down Jt~Ivn,  
   switch(wParam) hI[} -  
   { 3jmo[<p*x  
    case VK_MENU: .@1+}0  
     MaskBits|=ALTBIT; -m@o\9Ic  
     break; uuzV,q  
    case VK_CONTROL: .*O*@)}Ud  
     MaskBits|=CTRLBIT; L/3A g* ]  
     break; B#sCB&(  
    case VK_SHIFT: )6|L]'dsZ  
     MaskBits|=SHIFTBIT; qi-XNB`b  
     break; "oP^2|${  
    default: //judge the key and send message z;OYPGvkw  
     break; !avol/*  
   } +WX/4_STV  
   for(int index=0;index<MAX_KEY;index++) }gp@0ri%5  
   { mHD_cgKN  
    if(hCallWnd[index]==NULL) WT *"V<Z  
     continue; R@e'=z[%1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8K%N7RL|  
    { /:dLqyQ_V  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); }nmlN  
     bProcessed=TRUE; 2YD\KXDo  
    } b@CB +8 $  
   } n1[c\1   
  } t,/ G  
  if(!bProcessed){ )"?4d[ 5  
   for(int index=0;index<MAX_KEY;index++){ SV7;B?e%Y  
    if(hCallWnd[index]==NULL) uF ?[H -y  
     continue; K)Y& I  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) [W[{ 4 Xu  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); bS_#3T  
   } ~.a"jYb7A}  
  } (vXr2Z<l  
 } Sp `l>BL  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); {X{R]  
} C.j+Zb1Z(  
KE?t?p  
BOOL InitHotkey() W.wPy@yi  
{ $8EEtr,!  
 if(hHook!=NULL){ 1gI7$y+?  
  nHookCount++; -I< >Ab  
  return TRUE; Vk5Z[w a  
 } kVn RSg}R  
 else X>(1fra4  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ,67Q!/O  
  if(hHook!=NULL) MK< y$B{}  
   nHookCount++; ('J/Ww<  
  return (hHook!=NULL); o3WOp80hz  
} /:|vJ|dJ  
BOOL UnInit() >P6"-x,["  
{ oFk2y^>u  
 if(nHookCount>1){ a~o <>H  
  nHookCount--; XF`2*:7  
  return TRUE; )f8>kz(  
 } h]7_ N,  
 BOOL unhooked = UnhookWindowsHookEx(hHook); y\Wn:RR1[  
 if(unhooked==TRUE){ 2+]5}'M  
  nHookCount=0; @T1G#[C~t  
  hHook=NULL; "Ih3  
 } HU0.)tD  
 return unhooked; -@Ap;,=  
} GwWK'F'2  
z/?* h  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) B-I4(w($  
{ ?0qVyK_1  
 BOOL bAdded=FALSE; s 6Wp"V(  
 for(int index=0;index<MAX_KEY;index++){ BR|!ya+_2  
  if(hCallWnd[index]==0){ so))J`ca)  
   hCallWnd[index]=hWnd; u=`H n-(  
   HotKey[index]=cKey; .1QGNW  
   HotKeyMask[index]=cMask; ,0'G HQWz$  
   bAdded=TRUE; %G?@Hye3  
   KeyCount++; d3%qYL_+a  
   break; Y,L`WeQY.  
  } 4P{|H  
 } c~|(j \FI  
 return bAdded; !Vpi1N\  
} )k<cd.MX  
U1 `5P!ov  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 7H H  
{ ~E}kwF  
 BOOL bRemoved=FALSE; %0\@\fC41  
 for(int index=0;index<MAX_KEY;index++){ Sv=YI  
  if(hCallWnd[index]==hWnd){ bW yimr&B  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ $q!A1Fgk0  
    hCallWnd[index]=NULL; (Tx_`rO4VY  
    HotKey[index]=0; dJuyJl$*  
    HotKeyMask[index]=0; c!w[)>v  
    bRemoved=TRUE; '1u?-2  
    KeyCount--; i?L=8+9f  
    break; QE 4   
   } /*C!]Z>.  
  } \p!UY 3'  
 } C T~6T&'  
 return bRemoved; (g6e5Sgi>  
} Q  :kg  
5:PS74/  
void VerifyWindow() s.M39W?  
{ p.:651b  
 for(int i=0;i<MAX_KEY;i++){ wm@m(ArE=  
  if(hCallWnd!=NULL){ 5Fydh0.  
   if(!IsWindow(hCallWnd)){ @ZEBtM%.O  
    hCallWnd=NULL; =DwLNyjU4  
    HotKey=0; 'O a3 6@  
    HotKeyMask=0; gUiO66#x  
    KeyCount--; 082}=Tsx   
   } Xj, %t}  
  } We6eAP/Z  
 } [^!SkQ  
} :.PA(97x b  
V#G)w~   
BOOL CHookApp::InitInstance() <4{m99  
{ z|s(D<*w  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); @$slGY  
 hins=AfxGetInstanceHandle(); ^y,h0?Z9  
 InitHotkey(); aEf3hB*~  
 return CWinApp::InitInstance(); fW = N  
} p22AH%  
Q#MB=:0 {  
int CHookApp::ExitInstance() LhG\)>Y%  
{ {S0-y  
 VerifyWindow(); z ]f(lwo{  
 UnInit(); #-|fdcb  
 return CWinApp::ExitInstance(); 1dvP2E  
} ` wa;@p+j8  
MlTC?Rp#  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file XPhP1 ^>\  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Dgz, Uad8f  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ n bxY'`8F  
#if _MSC_VER > 1000 81nD:]7  
#pragma once 8T+9 fh]I  
#endif // _MSC_VER > 1000 >H+t ZV  
(wj:Gc  
class CCaptureDlg : public CDialog ?}`- ?JB1  
{ c0wLc,)G  
 // Construction y\v#qFVOZ  
 public: ~\=D@G,9  
  BOOL bTray; 7U7!'xU  
  BOOL bRegistered; 8#!g;`~ D  
  BOOL RegisterHotkey(); R_!'=0}V  
  UCHAR cKey; l/k-` LeW  
  UCHAR cMask; )qx;/=D  
  void DeleteIcon(); Tm^kZuT{  
  void AddIcon(); ~q`f@I  
  UINT nCount; ;*?>w|t}w  
  void SaveBmp(); SM~~:  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor gk%01&_>4  
  // Dialog Data V u")%(ix  
  //{{AFX_DATA(CCaptureDlg) ,^bgk -x-  
  enum { IDD = IDD_CAPTURE_DIALOG }; :2lpl%/  
  CComboBox m_Key; <M9NyD`  
  BOOL m_bControl; ?22U0UF  
  BOOL m_bAlt; s AFn.W  
  BOOL m_bShift; :uo)-9_  
  CString m_Path; 3JC uM_y  
  CString m_Number; 1 b 7jNkQ  
  //}}AFX_DATA b |:Y3_>  
  // ClassWizard generated virtual function overrides "{8j!+]4i  
  //{{AFX_VIRTUAL(CCaptureDlg) *I :c@iCNJ  
 public: 7V%P  
  virtual BOOL PreTranslateMessage(MSG* pMsg); -sJ1q^;f@  
 protected: OROvy  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support $e1.y b%  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 9(t(sP_  
  //}}AFX_VIRTUAL ;6@sC[  
  // Implementation HGAi2+&  
 protected: LqYyIbsvf  
  HICON m_hIcon; Tdh(J",d  
  // Generated message map functions {|>'(iqH"w  
  //{{AFX_MSG(CCaptureDlg) + yI$4MY  
  virtual BOOL OnInitDialog(); Muwlehuq  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Cu`  
  afx_msg void OnPaint(); # fqrZ9:@  
  afx_msg HCURSOR OnQueryDragIcon(); TG;[,oa  
  virtual void OnCancel(); Q z(n41@`  
  afx_msg void OnAbout(); G,>YzjMY`  
  afx_msg void OnBrowse(); D?#l8  
  afx_msg void OnChange(); A6[FH\f  
 //}}AFX_MSG 3IRur,|'  
 DECLARE_MESSAGE_MAP() * WV=Xp  
}; .xqi7vVHZ  
#endif nA0%M1a  
(Y'cxwj%  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file z&QfZs  
#include "stdafx.h" o/3.U=px~  
#include "Capture.h" [.4{s  
#include "CaptureDlg.h" ~AjPa}@ f  
#include <windowsx.h> umns*U%T;  
#pragma comment(lib,"hook.lib") id" `o  
#ifdef _DEBUG i&m_G5u88  
#define new DEBUG_NEW 2.WI".&y=  
#undef THIS_FILE %16Lo<DPm  
static char THIS_FILE[] = __FILE__; WOZuFS13  
#endif %|e)s_%XE  
#define IDM_SHELL WM_USER+1 -E1-(TS  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); d<d3j9u(#  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); CNb(\]  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; @'>RGaPV  
class CAboutDlg : public CDialog .X%J}c$  
{ EMP|I^  
 public: uD@ ZM  
  CAboutDlg(); FD[*Q2fU  
  // Dialog Data O*v&C Hd3  
  //{{AFX_DATA(CAboutDlg) 6yy%_+k*  
  enum { IDD = IDD_ABOUTBOX }; .v(GVkE}  
  //}}AFX_DATA wH8J?j"5>  
  // ClassWizard generated virtual function overrides ,=\.L_'  
  //{{AFX_VIRTUAL(CAboutDlg) MrzD ah9UG  
 protected: T^Ia^B-%}g  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support )Zr\W3yWX  
  //}}AFX_VIRTUAL  >SQzE  
  // Implementation "a].v 8l!  
 protected: 6!>p<p"Ns  
  //{{AFX_MSG(CAboutDlg) XfE0P(sE  
  //}}AFX_MSG %SB4_ r*<  
  DECLARE_MESSAGE_MAP() /pjl6dJ t  
}; 7SS#V  
z=KDkpV  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) `E1G9BbU  
{ u `/V1  
 //{{AFX_DATA_INIT(CAboutDlg) UhqTn$=fb  
 //}}AFX_DATA_INIT 27 XM&ZrZ  
} q;bw }4  
Ea S[W?u}  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) (1|wM+)"  
{ 8!|vp7/  
 CDialog::DoDataExchange(pDX); C W#:'  
 //{{AFX_DATA_MAP(CAboutDlg) Y Iwa =^  
 //}}AFX_DATA_MAP 0?$|F0U"J  
} r'Wf4p^Xd  
~588M 8~  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) P!Fy kg  
 //{{AFX_MSG_MAP(CAboutDlg) VxDIA_@y  
 // No message handlers Pw<'rN8''  
 //}}AFX_MSG_MAP C]2-V1,ZX  
END_MESSAGE_MAP() AuK$KGCI=  
xI{fd1  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) R_B0CM<!  
: CDialog(CCaptureDlg::IDD, pParent) o)XrC   
{ )qb'tZz/g_  
 //{{AFX_DATA_INIT(CCaptureDlg) OW#0$%f  
  m_bControl = FALSE; 6&0@k^7~  
  m_bAlt = FALSE; 5@+?{Cl  
  m_bShift = FALSE; [hSJ)IZh  
  m_Path = _T("c:\\"); +# 'w} P  
  m_Number = _T("0 picture captured."); d)1gpRp  
  nCount=0; AE>W$x8P  
  bRegistered=FALSE; Bk\Y v0  
  bTray=FALSE; msgR"T3'  
 //}}AFX_DATA_INIT o3hgkoF   
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ;Tr,BfV|Bf  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 5e. aTW;U  
} QP.Lq }  
-9FGFBm4]  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ld ]*J}cw  
{ 1s(T#jh  
 CDialog::DoDataExchange(pDX); g ptf*^s  
 //{{AFX_DATA_MAP(CCaptureDlg) xjr4')h  
  DDX_Control(pDX, IDC_KEY, m_Key); T`wDdqWbEG  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); SI~jM:S}  
  DDX_Check(pDX, IDC_ALT, m_bAlt); jbipNgxkr  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); vN^.MR+<  
  DDX_Text(pDX, IDC_PATH, m_Path); V3ht:>c9qs  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ~D3 S01ecM  
 //}}AFX_DATA_MAP s>o#Ob@4'  
} )KE  
%\ i&g$  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) T+nID@"36  
//{{AFX_MSG_MAP(CCaptureDlg) nfF$h}<o+  
 ON_WM_SYSCOMMAND() \4wMv[;7  
 ON_WM_PAINT() #dae^UjM  
 ON_WM_QUERYDRAGICON() uKAI->"  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ;iuwIdo6c  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) tgKr*8t{  
 ON_BN_CLICKED(ID_CHANGE, OnChange) D%]S>g5k  
//}}AFX_MSG_MAP 'Z~ZSu  
END_MESSAGE_MAP() U4=l`{5on  
f2x!cL|Kx?  
BOOL CCaptureDlg::OnInitDialog() '27$x&6>S  
{ cZ_)'0  
 CDialog::OnInitDialog(); 'wEQvCS  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); <z\SKR[  
 ASSERT(IDM_ABOUTBOX < 0xF000); |Jn|GnM  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Is4,QnY_[  
 if (pSysMenu != NULL) y/\b0&  
 { }qM^J;uy  
  CString strAboutMenu; 53{\H&q  
  strAboutMenu.LoadString(IDS_ABOUTBOX); TiI/I`A  
  if (!strAboutMenu.IsEmpty()) K1hkOj;S  
  { +o`%7r(R  
   pSysMenu->AppendMenu(MF_SEPARATOR); {WV"]O8IV  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); N_bgWQY  
  } Xd%qebK  
 } ~Pw9[ycn3  
 SetIcon(m_hIcon, TRUE); // Set big icon :W0p3 6"  
 SetIcon(m_hIcon, FALSE); // Set small icon *|Vf1R]  
 m_Key.SetCurSel(0); :ZY%-]u7  
 RegisterHotkey(); 3eE=>E4,  
 CMenu* pMenu=GetSystemMenu(FALSE); :rU.5(,  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 3S3(Gl  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); +"-l~`+<es  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); V?S}%-a  
 return TRUE; // return TRUE unless you set the focus to a control je^VJ&ac  
} syB pF:`-W  
1<'z)r4  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) D/Ki^E  
{ ^nNY| *  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ]]K?Q )9x  
 { x9>$197  
  CAboutDlg dlgAbout; */h(4Hz  
  dlgAbout.DoModal(); 3XlQ4  
 } > pb}@\;:  
 else y!gPBkG&3n  
 { xR0*w7YE  
  CDialog::OnSysCommand(nID, lParam); e-y$&[  
 } &zF>5@fM  
} UDr 1t n  
vU,7Y|t`  
void CCaptureDlg::OnPaint() > f X^NX  
{ K+vD&Z^  
 if (IsIconic()) y\^zxG*]'  
 { bK%F_v3'  
  CPaintDC dc(this); // device context for painting [<f2h-V$  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); *fc8M(]&d  
  // Center icon in client rectangle ]|g2V a~-  
  int cxIcon = GetSystemMetrics(SM_CXICON); n{!{,s  
  int cyIcon = GetSystemMetrics(SM_CYICON); 39 }e }W"  
  CRect rect; ,;}   
  GetClientRect(&rect); w{DU<e:  
  int x = (rect.Width() - cxIcon + 1) / 2; "'[M~Js  
  int y = (rect.Height() - cyIcon + 1) / 2; s 1M-(d Q  
  // Draw the icon 8<; .  
  dc.DrawIcon(x, y, m_hIcon); zK~8@{l}_"  
 } 3R< r[3WP  
 else w3,KqF  
 { )1Bz0:  
  CDialog::OnPaint(); C`[2B0  
 } C{/U;Ie-b  
} n~6$CQ5dF(  
u!D?^:u=)  
HCURSOR CCaptureDlg::OnQueryDragIcon() a?+C]u?_D  
{ ;>Z+b#C[  
 return (HCURSOR) m_hIcon; y_Lnk=Q ^  
} |iUF3s|?  
9ia&/BT7"z  
void CCaptureDlg::OnCancel() J.XkdGQ  
{ kEq~M10  
 if(bTray) 2?%*UxcO  
  DeleteIcon(); .\oW@2,RA9  
  CDialog::OnCancel(); V]--d33/a  
} U>*@VOgB  
I*TTD]e'X  
void CCaptureDlg::OnAbout() \m|5Aqs  
{ vxPE=!|  
 CAboutDlg dlg; ?VotIruR  
 dlg.DoModal(); .) tQ&2  
} c\ZI 5&4jT  
w&H>`l06  
void CCaptureDlg::OnBrowse() poafGoH-Y  
{ E'{:HX  
 CString str; @lDnD%vZ`  
 BROWSEINFO bi; n>u_>2Ikkj  
 char name[MAX_PATH]; < !m.+  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); <7`k[~)VB  
 bi.hwndOwner=GetSafeHwnd(); O<p=&=TD7  
 bi.pszDisplayName=name; h$`m0-'  
 bi.lpszTitle="Select folder"; I@m(}  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; G_=i#Tu[  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); AAfU]4u0S  
 if(idl==NULL) ,K}"o~z  
  return; f B<Qs.T  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); O8#]7\)  
 str.ReleaseBuffer(); vX>{1`e{S  
 m_Path=str; ,$t1LV;o=  
 if(str.GetAt(str.GetLength()-1)!='\\') g0B-<>E  
  m_Path+="\\"; tb?TPd-OY  
 UpdateData(FALSE); ?wkT=mv  
} G!VEV3zT  
W>!:K^8]  
void CCaptureDlg::SaveBmp() dn'|~zf.  
{ Sm {Sq  
 CDC dc; " l|`LjP5M  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); [H\0 '  
 CBitmap bm; r[ k  
 int Width=GetSystemMetrics(SM_CXSCREEN); <[ dt2)%L>  
 int Height=GetSystemMetrics(SM_CYSCREEN); " TCJT390  
 bm.CreateCompatibleBitmap(&dc,Width,Height); h(kPf ]0  
 CDC tdc; wclj9&k  
 tdc.CreateCompatibleDC(&dc); jl}9R]Y_2  
 CBitmap*pOld=tdc.SelectObject(&bm); J1(SL~e],  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ~c v|,  
 tdc.SelectObject(pOld); +vJ}'uR3P  
 BITMAP btm; g \S6>LG!  
 bm.GetBitmap(&btm); "a;$uW@.6  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 7@ONCG  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); S ^~"#   
 BITMAPINFOHEADER bih; , SUx!o  
 bih.biBitCount=btm.bmBitsPixel; F}mt *UcMG  
 bih.biClrImportant=0; GTbV5{Ss  
 bih.biClrUsed=0; sQ\HIU%]  
 bih.biCompression=0; 7p'pz8n`X  
 bih.biHeight=btm.bmHeight; 5+{oQs_  
 bih.biPlanes=1; 5xKod0bA  
 bih.biSize=sizeof(BITMAPINFOHEADER); KU "+i8"  
 bih.biSizeImage=size; Il\{m?Y  
 bih.biWidth=btm.bmWidth; |a])o  
 bih.biXPelsPerMeter=0; O=}  
 bih.biYPelsPerMeter=0; yT<"?S>D  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 93Gj#Mk  
 static int filecount=0; ? .B t.  
 CString name; T*B`8P  
 name.Format("pict%04d.bmp",filecount++); 'S}3lsIE  
 name=m_Path+name; hB<(~L? A]  
 BITMAPFILEHEADER bfh; ghW`xm87  
 bfh.bfReserved1=bfh.bfReserved2=0; rg[#(  
 bfh.bfType=((WORD)('M'<< 8)|'B'); +Goh`!$Rj9  
 bfh.bfSize=54+size; |#t^D.j  
 bfh.bfOffBits=54; !ckluj  
 CFile bf; 4J'0k<5S  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ (ZF~   
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); HrLws95'  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); _~1O#*|4  
  bf.WriteHuge(lpData,size); eCJtNPd  
  bf.Close(); dL'oIBp  
  nCount++; )]w&DNc  
 } B:i$  
 GlobalFreePtr(lpData); ;L76V$&  
 if(nCount==1) A+Un(tU2(  
  m_Number.Format("%d picture captured.",nCount); rvhMu}.  
 else ZX-A}  
  m_Number.Format("%d pictures captured.",nCount); {7X9P<<L7  
  UpdateData(FALSE); jEx8G3EL  
} 'p!&&.%  
4+>~Ui_#  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ORX<ZO t1  
{ o4a@{nt^,  
 if(pMsg -> message == WM_KEYDOWN) V`/c#y||  
 { D)4#AI  
  if(pMsg -> wParam == VK_ESCAPE) n|.eL8lX.<  
   return TRUE; &<&eKq  
  if(pMsg -> wParam == VK_RETURN) .+8#&Uy  
   return TRUE; 3&[d.,/  
 } ;O>zA]Z8r  
 return CDialog::PreTranslateMessage(pMsg); V@z/%=PJ  
} 9. FXbNYg  
(O:&RAkk7  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) :`BG/  
{ 7/]Ra  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ }`0=\cKqn  
  SaveBmp(); 6L~5qbQ  
  return FALSE; b:O_PS5h  
} \qW^AD(it<  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ T|$tQgY^  
 CMenu pop; l9%ckC*q  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ZZ}HgPZ  
 CMenu*pMenu=pop.GetSubMenu(0); B|^=2 >8s  
 pMenu->SetDefaultItem(ID_EXITICON); P"Q6wdm  
 CPoint pt; dZkKAK:v  
 GetCursorPos(&pt); 1'&HmBfcb  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); B&!>& Rbx  
 if(id==ID_EXITICON) #Wl9[W/4  
  DeleteIcon(); ~r})&`5  
 else if(id==ID_EXIT) y9i+EV  
  OnCancel(); Y!c7P,cZ+3  
 return FALSE; `} 'o2oZnG  
} %dd B$(  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 1,P2}mYv  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) UBnHtsM  
 AddIcon(); \,nhGh  
 return res; [BKTZQ@G@  
} +:C.G[+  
Qdc#v\B  
void CCaptureDlg::AddIcon() h|z59h&X8G  
{ 1D"EF  
 NOTIFYICONDATA data; Sng3B  
 data.cbSize=sizeof(NOTIFYICONDATA); /sB,)> X  
 CString tip; 2jQ?-/Q8#  
 tip.LoadString(IDS_ICONTIP); Wb^g{F!W  
 data.hIcon=GetIcon(0);  GVu-<R  
 data.hWnd=GetSafeHwnd(); d_V7w4lK  
 strcpy(data.szTip,tip); v~dUH0P<>e  
 data.uCallbackMessage=IDM_SHELL; :Ef$[_S>  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; L?(1 [jB4G  
 data.uID=98; T-oUcuQB  
 Shell_NotifyIcon(NIM_ADD,&data); ]xV2= !J  
 ShowWindow(SW_HIDE); apxq] ! `  
 bTray=TRUE; TuwSJS7  
} ZQ\O| n8  
Z2]\k|%<Fa  
void CCaptureDlg::DeleteIcon() ZOJ7 ^g  
{ ,/p .!+  
 NOTIFYICONDATA data; )q{e L$  
 data.cbSize=sizeof(NOTIFYICONDATA); i94)DWZ^  
 data.hWnd=GetSafeHwnd(); 6l|SGt\  
 data.uID=98; Q^lgtb  
 Shell_NotifyIcon(NIM_DELETE,&data); M~saYJio  
 ShowWindow(SW_SHOW); \S?;5LacZ  
 SetForegroundWindow(); 1$yS Ii  
 ShowWindow(SW_SHOWNORMAL); 2+YM .Zl  
 bTray=FALSE; YMwL(m1  
} u69G #  
:N4?W}r.  
void CCaptureDlg::OnChange() ,{RWs^W2  
{ %LL?'&&  
 RegisterHotkey(); P=4o)e7E!  
} t .XuH#  
7c'OIY].,  
BOOL CCaptureDlg::RegisterHotkey() SzjylUYV  
{ hZO=$Mm4p  
 UpdateData(); }f] ~{^  
 UCHAR mask=0; mL s>RR#b  
 UCHAR key=0; 3SF J8  
 if(m_bControl) fdKTj =4  
  mask|=4; ot^$/(W  
 if(m_bAlt) }Mc&yjhMrg  
  mask|=2; _#E@& z".L  
 if(m_bShift) \T`iq[+6  
  mask|=1; d^aLue>g;+  
  key=Key_Table[m_Key.GetCurSel()]; 0o?2Sf`L\*  
 if(bRegistered){ <3{ >;^|e  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); LgSVEQb6\|  
  bRegistered=FALSE; <qxqlEQT  
 } s(Fxi|v;  
 cMask=mask; S#ud<=@!9  
 cKey=key; 2cJ3b 0Xx  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); N!af1zj  
 return bRegistered; M ~6k[ew  
} Ot!*,%sjQ  
VSc)0eyn  
  四、小结 $olITe"$g  
KSl@V>!_  
  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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