社区应用 最新帖子 精华区 社区服务 会员列表 统计排行 社区论坛任务 迷你宠物
  • 5108阅读
  • 0回复

用Visual C++实现屏幕抓图程序

级别: 终身会员
发帖
3743
铜板
8
人品值
493
贡献值
9
交易币
0
好评度
3746
信誉值
0
金币
0
所在楼道
 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: O_QDjxj^rZ  
  uFr12ZFgK  
  一、实现方法 0/HFLz'  
r1!1u7dr t  
  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: ]V"P &; m  
l7`{O/hN  
#pragma data_seg("shareddata") TdFU,  
HHOOK hHook =NULL; //钩子句柄 *\ii +f-  
UINT nHookCount =0; //挂接的程序数目 I`_2Q:r  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 (%_X{R'  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 l";Yw]:^  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey f' A$':Y  
static int KeyCount =0; KL \>-  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 yD"]:ts3  
#pragma data_seg() \$9C1@B@  
2"&GH1  
  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。 \,S |>CPQ  
gvP-doA7W  
  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: N~/ 'EaO  
=3-=p&*  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 3IYFvq~  
cKey,UCHAR cMask) nJI2IPZ  
{ 4t*%(  
 BOOL bAdded=FALSE; gC}}8( k  
 for(int index=0;index<MAX_KEY;index++){ eT b!xb  
  if(hCallWnd[index]==0){ Pmv@  
   hCallWnd[index]=hWnd; E &9<JS  
   HotKey[index]=cKey; nDn J}`k  
   HotKeyMask[index]=cMask; l uP;P&  
   bAdded=TRUE; .\_):j*  
   KeyCount++; IiE6i43  
   break; XFWpHe_ L  
  } $;5Q mKQ'  
 } [!uzXVS3  
 return bAdded; |r~u7U\  
} B:h<iU:'D  
//删除热键 |_?e.}K  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) >XtfT'  
{ oq7G=8gTp  
 BOOL bRemoved=FALSE; C1 ^%!)  
 for(int index=0;index<MAX_KEY;index++){ <::lfPP  
  if(hCallWnd[index]==hWnd){ >/ay'EyY;>  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Zn9tG:V  
    hCallWnd[index]=NULL; ;6/WjUDw<|  
    HotKey[index]=0; m>=DJ{KQ  
    HotKeyMask[index]=0; SKC;@?  
    bRemoved=TRUE; J9lZ1,22  
    KeyCount--; 4iAF<|6s  
    break; :#:|:q.]  
   } 3\W/VBJJ  
  } hs7!S+[.$$  
 } L{1sYR%s\  
 return bRemoved; }y6)d.  
} $udhTI#,  
44KoOY_  
N3"JouP  
  DLL中的钩子函数如下: & /8Tth86  
40?RiwwD  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 0+SDFh  
{ tWn dAM(U7  
 BOOL bProcessed=FALSE; nI6 gd%C  
 if(HC_ACTION==nCode) +q&Hj|;8r  
 { Q:b0M11QR  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 qfsPX6]  
   switch(wParam) ?/YABY}L  
   {  cWAw-E5  
    case VK_MENU: %`F;i)Zz  
     MaskBits&=~ALTBIT; F85_Lz4  
     break; '=0}2sF>  
    case VK_CONTROL: C8K2F5c5  
     MaskBits&=~CTRLBIT; _mSefPl  
     break; ko9}?qs  
    case VK_SHIFT: "{~5QO   
     MaskBits&=~SHIFTBIT; CH6 m  
     break; ? xR7Ii3  
    default: //judge the key and send message ^+x?@$rq  
     break; ^fsMfB  
   } 6*i **  
   for(int index=0;index<MAX_KEY;index++){ G _cJI  
    if(hCallWnd[index]==NULL) F*P0=DD  
     continue; X +!+&RAN*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) JmCMFq B9  
    { DFMpU.BN W  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); uzdPA'u  
     bProcessed=TRUE; T^ktfg Xq  
    } :)#;0o5  
   } g-qXS]y7  
  } >NUbk9}J4  
  else if((lParam&0xc000ffff)==1){ //有键按下 i}vJI}S.$  
   switch(wParam) f\_RW;y|m  
   { c|/HX%Y  
    case VK_MENU: FJeh=\  
     MaskBits|=ALTBIT; @jn&Wf?  
     break; m?kiGC&m  
    case VK_CONTROL: AM- bs^  
     MaskBits|=CTRLBIT; uG\~Hxqw7O  
     break; *I 1H  
    case VK_SHIFT: y?OP- 27y  
     MaskBits|=SHIFTBIT; \:;MFG'  
     break; irQ'Rm [  
    default: //judge the key and send message JY  
     break; ~/G)z?+E  
   } `=Ip>7T&  
   for(int index=0;index<MAX_KEY;index++){ )'kpO>_G  
    if(hCallWnd[index]==NULL) tLu&3<%  
     continue; E7$&:xqx  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) [[|#}D:L  
    { (~DW_+?]'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 9w-\K]  
     bProcessed=TRUE; *s4|'KS2o  
    } 2u$-(JfoS  
   } ,)`_?^ \$f  
  } %}@iz(*}>  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 =\6)B{#T  
   for(int index=0;index<MAX_KEY;index++){ ,' k?rQ  
    if(hCallWnd[index]==NULL) e)uC  
     continue; M|blg!j;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) |O(>{GH  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); t9`{^<LH  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 kk78*s {6  
   } v +4v  
  } h,{Q%sqO  
 } V&f*+!!2  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); l\Ozy  
} egu{}5  
G!j9D  
  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: r~,y3L6ic  
/V,xSK9.&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); _=$~l^Y[  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ,1ev2T  
Xz4q^XJ  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 8Qg{@#Wr  
.{ v$;g  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) SXw r$)4_  
{ +JErc)%  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) =7V4{|ESfy  
 { r(r(&NU  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 7 z    
  SaveBmp(); 8C{&i5kj\E  
  return FALSE; 5qrD~D '  
 } |:S6Gp[\O  
 …… //其它处理及默认处理 2}&ERW  
} IRbyW?/Xv  
GDLi ?3q  
Gj?Zbl <  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 =n,;S W  
R%.`h  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 {($bz T7c  
{L;sF=d  
  二、编程步骤 %* 0GEfl/  
v\@qMaPY  
  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"; F>\,`wP  
fAJyD`]Z  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; a{ST4d'T  
(}b~}X9  
  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; _&l8^MD  
2 `AdNt,  
  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; [WDzaRzd  
=%|`gZ  
  5、 添加代码,编译运行程序。 2_pF#M9  
a*(Zb|g  
三、程序代码 S #GxKMO%  
:la i0> D  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 2E40&  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) p8,=K<  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ >7BP}5`.;  
#if _MSC_VER > 1000 30HUY?'K  
#pragma once e]1=&:eX#d  
#endif // _MSC_VER > 1000 Owf!dMA;nF  
#ifndef __AFXWIN_H__ W|2^yO,dX  
#error include 'stdafx.h' before including this file for PCH \oPe" k=  
#endif _4>DuklH,  
#include "resource.h" // main symbols w"0$cL3  
class CHookApp : public CWinApp br=e+]C Y)  
{ !sX$?P%U  
 public: a[hF2/*  
  CHookApp(); w9Yx2  
  // Overrides uUfw"*D  
  // ClassWizard generated virtual function overrides Ij(dgY  
  //{{AFX_VIRTUAL(CHookApp) XEiVs\) G  
 public: &m--}  
  virtual BOOL InitInstance(); 5x@ U<  
  virtual int ExitInstance(); 3}}/,pGSc  
  //}}AFX_VIRTUAL eY 3:Nl^  
  //{{AFX_MSG(CHookApp) ]L~z9)  
  // NOTE - the ClassWizard will add and remove member functions here. IX+Jf? &^  
  // DO NOT EDIT what you see in these blocks of generated code ! nC3+Zka  
  //}}AFX_MSG jN+`V)p  
  DECLARE_MESSAGE_MAP() ).kU7;0  
}; {APfSD_4  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); O ?T~>|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Gxd/t#;  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); /6rjGc  
BOOL InitHotkey(); XI`_PQco  
BOOL UnInit(); a >fA-@  
#endif .45wwouZkc  
9,fV  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Mzg'$]N  
#include "stdafx.h" S+06pj4Ie  
#include "hook.h" |6d:k~p  
#include <windowsx.h> @zS/J,:v}  
#ifdef _DEBUG W\[E  
#define new DEBUG_NEW P{dR pH|  
#undef THIS_FILE &3/`cl[+  
static char THIS_FILE[] = __FILE__; <uIPv Zsx  
#endif v Z10Rb8  
#define MAX_KEY 100 Fe[6Y<x+:  
#define CTRLBIT 0x04 sA6HkB.  
#define ALTBIT 0x02 ?e-rwaW  
#define SHIFTBIT 0x01 SsX$l<t*  
#pragma data_seg("shareddata") _,^f,WO~  
HHOOK hHook =NULL; 5tv*uz|fv  
UINT nHookCount =0; GYw/KT~$  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey u|23M,  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 8!v|`Ky  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey `x=kb;  
static int KeyCount =0; DQhHU1  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift n^QDMyC;I  
#pragma data_seg() m@nGXl'!  
HINSTANCE hins; fyUW;dj  
void VerifyWindow(); qF3S\ C  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) gS(JgN  
//{{AFX_MSG_MAP(CHookApp) _$*-?*V&  
// NOTE - the ClassWizard will add and remove mapping macros here. 'tTlBf7#  
// DO NOT EDIT what you see in these blocks of generated code! Db2#QQ  
//}}AFX_MSG_MAP ?Ho$fGz  
END_MESSAGE_MAP() fXevr `  
h`fZ 8|yw  
CHookApp::CHookApp() RCqL~7C+ k  
{ 3Dc^lfn  
 // TODO: add construction code here,  ~@@t-QY  
 // Place all significant initialization in InitInstance F@/syX;bb5  
} TJ>YJ D  
kk126?V]_  
CHookApp theApp; e77s?WxbK  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) W9cvxsox  
{ Nj6Np^@sH  
 BOOL bProcessed=FALSE; p,WBF  
 if(HC_ACTION==nCode) Rt%Dps%  
 { f~d =1  
  if((lParam&0xc0000000)==0xc0000000){// Key up _BG `!3U+  
   switch(wParam) )FB<gCh7X  
   { y~_x  
    case VK_MENU: >ptI!\i}  
     MaskBits&=~ALTBIT; Q m9b:U~  
     break; xG~-.  
    case VK_CONTROL: D vEII'-h  
     MaskBits&=~CTRLBIT; Wm8BhO  
     break; 3s BWtz  
    case VK_SHIFT: q&ed4{H<  
     MaskBits&=~SHIFTBIT; EHe-wC  
     break; fR.raI4et  
    default: //judge the key and send message nb5%a   
     break; rGH7S!\AM  
   } 3I?yRE  
   for(int index=0;index<MAX_KEY;index++){ !4F@ !.GG!  
    if(hCallWnd[index]==NULL) Z[+Qf3j}o6  
     continue; ,[m4+6G5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -GgV&%'a  
    { oi3Ix7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); pfim*\'  
     bProcessed=TRUE; dkEnc  
    } ]H:K$nmX  
   } i\36 s$\  
  } YVHDk7s  
  else if((lParam&0xc000ffff)==1){ //Key down xT9+l1_  
   switch(wParam) [t^%d9@t  
   { n=fR%<v  
    case VK_MENU: }xrrHp  
     MaskBits|=ALTBIT; k!@/|]3z  
     break; g2 V $  
    case VK_CONTROL: :Z ]E:f0P  
     MaskBits|=CTRLBIT; HV3wUEI3  
     break; %4To@#c  
    case VK_SHIFT: 0@f7`D  
     MaskBits|=SHIFTBIT; ,Ur~DXY  
     break; {iq{<;)U?U  
    default: //judge the key and send message HSl$ U0  
     break; ]*S_fme  
   } uuh vd h=  
   for(int index=0;index<MAX_KEY;index++) 8DrKq]&  
   { (aCl*vV1  
    if(hCallWnd[index]==NULL) Hi{!<e2  
     continue; nfvs"B;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Z.LF5ur  
    { S67T:ARS  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); FHH2  
     bProcessed=TRUE; = &aD!nTx  
    } .+AO3~Dg  
   } ldoN!J  
  } :kI x?cc  
  if(!bProcessed){ .uagD[${  
   for(int index=0;index<MAX_KEY;index++){ }Lwj~{  
    if(hCallWnd[index]==NULL) **YNR:#Y  
     continue; c9E9Rx  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) @p2dXJeR<  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); =09j1:''<d  
   } *DoEDw  
  } 7e#|=e *I!  
 } {_MU0=7c\  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); zT+yZA.L  
} cfe[6N  
skP_us~  
BOOL InitHotkey() 1J *wW# e  
{ +XRv iHA`  
 if(hHook!=NULL){ Zk;;~ESOU  
  nHookCount++; kk5i{.?[  
  return TRUE; 1 }q[8q  
 } vrW9<{  
 else k0D&F;a%  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); dl$l5z\  
  if(hHook!=NULL) _5YL !v&  
   nHookCount++; R QO{fC  
  return (hHook!=NULL); O,1u\Zy/  
} VZlvmN  
BOOL UnInit() SS~Txt75m  
{ yxQAO_C  
 if(nHookCount>1){ =v5(*$"pd"  
  nHookCount--; ^lMnwqx<  
  return TRUE; s*#|EdD6@  
 } IA!ixabG  
 BOOL unhooked = UnhookWindowsHookEx(hHook); !`#9#T|  
 if(unhooked==TRUE){ J2[QHr&tn  
  nHookCount=0; qP<,"9!I  
  hHook=NULL; \T]"pE+8l  
 } UZX)1?U  
 return unhooked; Z/RUrYeb  
} Tx_(^K  
]R>k0X.V  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) b~1p.J4  
{ IKr7"`  
 BOOL bAdded=FALSE; !<6wrOMaO  
 for(int index=0;index<MAX_KEY;index++){ +m7 x>ie)  
  if(hCallWnd[index]==0){ ".i{WyTt  
   hCallWnd[index]=hWnd; $xZk{ rK  
   HotKey[index]=cKey; f"0H9  
   HotKeyMask[index]=cMask; Y@\5gZ&T  
   bAdded=TRUE; =,]J"n8|v  
   KeyCount++; h5l Lb+  
   break; Gf]s?J^a  
  } Pd;ClMa%  
 } EIEq[`h  
 return bAdded; E;d 5$  
} CC-:dNb  
z|?R=;,u`  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Po4cbFZ  
{ |8`;55G  
 BOOL bRemoved=FALSE; TgB;R5  
 for(int index=0;index<MAX_KEY;index++){ PrKl whi#  
  if(hCallWnd[index]==hWnd){ QF;<%QF:  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ NU(/Yit  
    hCallWnd[index]=NULL; h{xER IV1u  
    HotKey[index]=0; ?-84_i  
    HotKeyMask[index]=0; ipp_?5TL  
    bRemoved=TRUE; KE3 /<0Z  
    KeyCount--; 1=a}{)0h  
    break; ^[Er%yr0  
   } k"7eHSy,  
  } 4vQHr!$Ep  
 } Y)*lw  
 return bRemoved; |O9=C`G_  
} # |I@`#O  
+r!h*4  
void VerifyWindow() ?W|IC8~d')  
{ MHYf8HN  
 for(int i=0;i<MAX_KEY;i++){ =GVhAzD3  
  if(hCallWnd!=NULL){ $B?7u@>,  
   if(!IsWindow(hCallWnd)){ D5m\u$~V  
    hCallWnd=NULL; VfcQibm  
    HotKey=0; lmcDA,7  
    HotKeyMask=0;  ck~xj0  
    KeyCount--; c-=0l)&'D=  
   } ^Q,/C8qeb  
  } ~+C#c,Nw  
 } uRy6~'  
} L K~,  
&P3vcB  
BOOL CHookApp::InitInstance() LI<5;oE;  
{ ;MJ1Q  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); JAz;_wS(k  
 hins=AfxGetInstanceHandle(); 5l}h8So4  
 InitHotkey(); *n'x S L  
 return CWinApp::InitInstance(); g\)z!DQ]  
} R,bcE4WR"  
7:<Ed"rdE  
int CHookApp::ExitInstance() _D4}[`  
{ S%fBt?-Cm  
 VerifyWindow(); 7dJaWD:&   
 UnInit(); B~#@fIL  
 return CWinApp::ExitInstance(); y)E2=JQA/  
} ):@%xoF5  
:GYv9OG  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file s- V$N  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ,AM-cwwT:u  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ eFI4(Y  
#if _MSC_VER > 1000 P.B'Gh#^  
#pragma once ]c2| m}I{:  
#endif // _MSC_VER > 1000 OJ 5 !+#>  
mD)O\.uA  
class CCaptureDlg : public CDialog ix+x-G  
{ i|^6s87"N2  
 // Construction *~uuCLv_  
 public: { bn#:75r  
  BOOL bTray; !?*!"S-Sl  
  BOOL bRegistered; Y%l3SB,5L  
  BOOL RegisterHotkey(); ~Wm}M  
  UCHAR cKey; 5,ahKB8  
  UCHAR cMask; $SVGpEw  
  void DeleteIcon(); )+,jal^7  
  void AddIcon(); 9`{2h$U  
  UINT nCount; Rk[ * p  
  void SaveBmp(); 9Ol_z\5  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor CM1a<bV<  
  // Dialog Data `=DCX%Vw  
  //{{AFX_DATA(CCaptureDlg) 8|NJ(D-$  
  enum { IDD = IDD_CAPTURE_DIALOG }; "%t`I)  
  CComboBox m_Key; r_E)HL/A  
  BOOL m_bControl; Q$L(fH kw  
  BOOL m_bAlt; 8Jj0-4]  
  BOOL m_bShift; 3]es$Jy  
  CString m_Path; ]?`p_G3O  
  CString m_Number; x 4</\o  
  //}}AFX_DATA F5MPy[  
  // ClassWizard generated virtual function overrides 34kd|!e,  
  //{{AFX_VIRTUAL(CCaptureDlg) [B @j@&  
 public: u g"<\"  
  virtual BOOL PreTranslateMessage(MSG* pMsg); H;|:r[d!  
 protected: )N 6[rw<  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support a&"*UJk<?  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); H`lD@q'S  
  //}}AFX_VIRTUAL "@w%TcA  
  // Implementation E}9ldM=]s  
 protected: rI+w1';C1  
  HICON m_hIcon; z xUj1  
  // Generated message map functions =>\-ma+  
  //{{AFX_MSG(CCaptureDlg) /+`<X%^U  
  virtual BOOL OnInitDialog(); {taVAcb  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam);  :$c:3~  
  afx_msg void OnPaint(); h)^A3;2F  
  afx_msg HCURSOR OnQueryDragIcon(); eI rmD  
  virtual void OnCancel(); zN)\2  
  afx_msg void OnAbout(); cCGXB|9fYR  
  afx_msg void OnBrowse(); S!W/K!wf  
  afx_msg void OnChange(); _j\=FJz[  
 //}}AFX_MSG bXwoJ2  
 DECLARE_MESSAGE_MAP() .r5oN+?e  
}; zf>^2t*\  
#endif xevP2pYG:  
n(YHk\2  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file /8t+d.r;/  
#include "stdafx.h" 0uO=wOIhH  
#include "Capture.h" WAXts]=  
#include "CaptureDlg.h" Wd56B+  
#include <windowsx.h> 1 3 `0d  
#pragma comment(lib,"hook.lib") e)dWa'2<  
#ifdef _DEBUG ]~S+nl yd<  
#define new DEBUG_NEW tlLn  
#undef THIS_FILE )z235}P  
static char THIS_FILE[] = __FILE__; {a8^6dm*E  
#endif ]j2v"n  
#define IDM_SHELL WM_USER+1 uE#,c\[8  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); g)?g7{&?>?  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); zZ"U9!T  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; )]c3bMVE-  
class CAboutDlg : public CDialog s[2ZxCrCw  
{ EvqAi/(g  
 public: )QCM2  
  CAboutDlg(); &_/%2qs  
  // Dialog Data #lshN,CPm  
  //{{AFX_DATA(CAboutDlg) 6mpg&'>  
  enum { IDD = IDD_ABOUTBOX }; oXlxPN39  
  //}}AFX_DATA @ PoFxv  
  // ClassWizard generated virtual function overrides fCf#zV[  
  //{{AFX_VIRTUAL(CAboutDlg) K}E7|gdG  
 protected: h<' 5q&y  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support .n& Cq+U;  
  //}}AFX_VIRTUAL Sja{$zL+W  
  // Implementation WCmNibj  
 protected: m_!vIUOz  
  //{{AFX_MSG(CAboutDlg) Jp3di&x  
  //}}AFX_MSG &M3ES}6  
  DECLARE_MESSAGE_MAP() H]$=*(aje  
};  +iH30v  
Jhsv2,8 {  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) q X%vRf0  
{ n~)HfY  
 //{{AFX_DATA_INIT(CAboutDlg) rH&r6Xv[  
 //}}AFX_DATA_INIT Xvj=*wg\Y  
} f UF;SqT  
r ctSS:1  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) s |gD  
{ u2-@?yt  
 CDialog::DoDataExchange(pDX); nz(q)"A  
 //{{AFX_DATA_MAP(CAboutDlg) H8-D'q>R  
 //}}AFX_DATA_MAP *M&VqG4P9w  
} 3_\{[_W  
2@3.xG  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) $TA6S+  
 //{{AFX_MSG_MAP(CAboutDlg) gJ3OK!/  
 // No message handlers jxnQG A  
 //}}AFX_MSG_MAP En,)}yI  
END_MESSAGE_MAP() ^\[LrPq e  
5Hwo)S]r  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) VqClM  
: CDialog(CCaptureDlg::IDD, pParent) y^!E "  
{ cF_;hD|YZ  
 //{{AFX_DATA_INIT(CCaptureDlg) FS`vK`'  
  m_bControl = FALSE; Dpdn%8+Z  
  m_bAlt = FALSE; <cDKGd  
  m_bShift = FALSE; C](z#c~c  
  m_Path = _T("c:\\"); i'Y'HI  
  m_Number = _T("0 picture captured."); cNuHXaWp  
  nCount=0; k~1j/VHv  
  bRegistered=FALSE; [EmOA.6  
  bTray=FALSE; j(%gMVu  
 //}}AFX_DATA_INIT C '-zh\a  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 OHHNWg_5  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ," C[Qg(  
} y^ X\^Kq  
XJmFJafQD  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) &gA6+b'  
{ 29Z!p2{hk  
 CDialog::DoDataExchange(pDX); T,WKo B  
 //{{AFX_DATA_MAP(CCaptureDlg) MjQ[^%lfL  
  DDX_Control(pDX, IDC_KEY, m_Key); QOT)x4!)  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Ns.3s7&  
  DDX_Check(pDX, IDC_ALT, m_bAlt); (}{_]X|e  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); oI_oz0nHk  
  DDX_Text(pDX, IDC_PATH, m_Path); -v;n"Zy1  
  DDX_Text(pDX, IDC_NUMBER, m_Number); F<yy>Wf  
 //}}AFX_DATA_MAP q}<.x8\  
} 1iNsX\M  
oNuPP5d[]  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) \6SMn6a4  
//{{AFX_MSG_MAP(CCaptureDlg) 6.U  "_%  
 ON_WM_SYSCOMMAND() )@Zc?Da  
 ON_WM_PAINT() /`+Hw dk  
 ON_WM_QUERYDRAGICON() k<YtoV  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 8ji^d1G,  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) cQ(}^KO  
 ON_BN_CLICKED(ID_CHANGE, OnChange) -XBKOybHBO  
//}}AFX_MSG_MAP |;A9A's  
END_MESSAGE_MAP() DO&+=o`"  
83KfM!w  
BOOL CCaptureDlg::OnInitDialog() NZo<IKD$  
{ oe(9mYWKa6  
 CDialog::OnInitDialog(); t1e4H=d>  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 01LZE,.  
 ASSERT(IDM_ABOUTBOX < 0xF000); %bIsrQ~B  
 CMenu* pSysMenu = GetSystemMenu(FALSE); xdd:yrC   
 if (pSysMenu != NULL) Gr5`1`8|  
 { ~@T+mHny  
  CString strAboutMenu; T!l mO?Q  
  strAboutMenu.LoadString(IDS_ABOUTBOX); [3j$ 4rP  
  if (!strAboutMenu.IsEmpty()) [ 8F \;  
  { LkJ$aW/  
   pSysMenu->AppendMenu(MF_SEPARATOR); T&1-eq>l  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); {q&@nm40  
  } ycgfZ 3K  
 } L]k*QIn:h  
 SetIcon(m_hIcon, TRUE); // Set big icon N9i}p^F<_  
 SetIcon(m_hIcon, FALSE); // Set small icon 5%<TF .;-J  
 m_Key.SetCurSel(0); 7$(_j<o`  
 RegisterHotkey(); 29"mE;j  
 CMenu* pMenu=GetSystemMenu(FALSE); EHpu*P~W  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); YXF#c)#  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 0jR){G9+  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); {UB%(E[Mr  
 return TRUE; // return TRUE unless you set the focus to a control HUj+-  
} [O^}rUqq  
0TTIaa$  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) DpA\r_D  
{ "_ LkZBW.  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 7{n\y l?  
 { f;.SSiT  
  CAboutDlg dlgAbout; zzX<?6MS  
  dlgAbout.DoModal(); \Y*!f|=of  
 } W`#gpi)7N  
 else xME(B@j  
 { mR"uhm}q  
  CDialog::OnSysCommand(nID, lParam); {bN Y  
 } 6 -]>]Hr-  
} za,6 du6  
fC_zX}3  
void CCaptureDlg::OnPaint() #hIEEkCp +  
{ 5pO]vBT  
 if (IsIconic()) hzaU8kb  
 { cX2$kIs;  
  CPaintDC dc(this); // device context for painting __ 8&Jv\  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); KzV.+f  
  // Center icon in client rectangle +Dv7:x7  
  int cxIcon = GetSystemMetrics(SM_CXICON); !0`lu_ZN  
  int cyIcon = GetSystemMetrics(SM_CYICON); vx'l> @]k  
  CRect rect; #`/bQ~s  
  GetClientRect(&rect); sNL+F  
  int x = (rect.Width() - cxIcon + 1) / 2; 4 GUA&qs  
  int y = (rect.Height() - cyIcon + 1) / 2; $h,d? .u6w  
  // Draw the icon ZQ|5W6c  
  dc.DrawIcon(x, y, m_hIcon); <BSSa`N`  
 } aZ$/<|y~:_  
 else FIH@2zA  
 { WPIZi[hBs  
  CDialog::OnPaint(); &9RH}zv6  
 } A*hZv|$0  
} T-^0:@5o9  
sr\cVv")  
HCURSOR CCaptureDlg::OnQueryDragIcon() 4 bn t=5]  
{ *t^eNUA  
 return (HCURSOR) m_hIcon; NN^QUB  
} "c6<zP  
bV_j`:MD  
void CCaptureDlg::OnCancel() i&JpM] N  
{ +vf:z?I8  
 if(bTray) YUCC*t  
  DeleteIcon(); JRq3>P  
  CDialog::OnCancel(); >zQNHSi  
} OZ=Cp$  
f_rp<R>Uu  
void CCaptureDlg::OnAbout() Wj&nUp{  
{ $|k%@Q>  
 CAboutDlg dlg; sMP:sCRC  
 dlg.DoModal(); #00D?nC  
} =LOk13l\"  
vHS2q >  
void CCaptureDlg::OnBrowse() guU=NQZ  
{ $(3uOsy   
 CString str; [P{a_(  
 BROWSEINFO bi; )AI?x@  
 char name[MAX_PATH]; "TfI+QgLF  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); <KX&zi<L)  
 bi.hwndOwner=GetSafeHwnd(); (Izf L1  
 bi.pszDisplayName=name; %yfE7UPS]  
 bi.lpszTitle="Select folder"; Y3k[~A7X  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; e gI&epN  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 19p8B&  
 if(idl==NULL) uxb:^d?D!  
  return; :5jexz."M  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ;,k=<]  
 str.ReleaseBuffer(); pl|h>4af  
 m_Path=str; 9p4y>3  
 if(str.GetAt(str.GetLength()-1)!='\\') X &D{5~qC  
  m_Path+="\\"; NEw $q4  
 UpdateData(FALSE); ~cIl$b  
} Jld\8=  
BKay*!'PX  
void CCaptureDlg::SaveBmp() ~ ltg  
{ `]jqQr97  
 CDC dc; o5SQ1;`   
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); myIe_k,F  
 CBitmap bm; W&YU^&`Yr  
 int Width=GetSystemMetrics(SM_CXSCREEN); 9Sz7\W0  
 int Height=GetSystemMetrics(SM_CYSCREEN); *}w+ 68eO  
 bm.CreateCompatibleBitmap(&dc,Width,Height); LL.x11 o3  
 CDC tdc; pw\P<9e=  
 tdc.CreateCompatibleDC(&dc); oR#Ob#&  
 CBitmap*pOld=tdc.SelectObject(&bm); q(Hip<6p  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 5]d{6Nc3P  
 tdc.SelectObject(pOld); FAw1o  
 BITMAP btm; hO \/  
 bm.GetBitmap(&btm); s1 bU  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; hO3 {  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Wo!;K|~P  
 BITMAPINFOHEADER bih; u h )o  
 bih.biBitCount=btm.bmBitsPixel; !zR)D|w&  
 bih.biClrImportant=0; w#9_eq|3  
 bih.biClrUsed=0; n'M>xq_  
 bih.biCompression=0; w"~<h;  
 bih.biHeight=btm.bmHeight; :^#vxdIC?  
 bih.biPlanes=1; )c+k_;t'+  
 bih.biSize=sizeof(BITMAPINFOHEADER); DW>ES/B8$(  
 bih.biSizeImage=size; [EOVw%R  
 bih.biWidth=btm.bmWidth; @PX\{6&  
 bih.biXPelsPerMeter=0;  R%"K  
 bih.biYPelsPerMeter=0; Vm,,u F  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); I3(d<+M  
 static int filecount=0; !),t"Ae?>  
 CString name; to`mnp9Z  
 name.Format("pict%04d.bmp",filecount++); Hhl-E:"H`  
 name=m_Path+name; /8c&Axuv  
 BITMAPFILEHEADER bfh; - {{[cT I  
 bfh.bfReserved1=bfh.bfReserved2=0; R/~,i;d>  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 0%#\w*X8  
 bfh.bfSize=54+size; G\kpUdj}  
 bfh.bfOffBits=54; 4MLH+/e  
 CFile bf; Oaa"T8t  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 59lj7  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); sJU`u'w  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); qybxXK:  
  bf.WriteHuge(lpData,size); ^2C>L}  
  bf.Close(); /iG7MC\`  
  nCount++; p!DP`Ouc3\  
 } =wrP:wYF  
 GlobalFreePtr(lpData); RB$ z]/=  
 if(nCount==1) :c=.D;,  
  m_Number.Format("%d picture captured.",nCount); cbYK5fj"T  
 else (s&&>M]r_  
  m_Number.Format("%d pictures captured.",nCount);  #^0(  
  UpdateData(FALSE); g) 1X&>  
} dYF=c   
1m)M;^_  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) [>Fm [5x  
{ _ck[&Q  
 if(pMsg -> message == WM_KEYDOWN) xaW{I7FfG  
 { i=rH7k  
  if(pMsg -> wParam == VK_ESCAPE) .<YcSG  
   return TRUE; +>tUz D  
  if(pMsg -> wParam == VK_RETURN) Fr [7  
   return TRUE; ;gB`YNL  
 } BC77<R!E)  
 return CDialog::PreTranslateMessage(pMsg); \Y5W!.(%w  
} q-_' W,  
Z a(|(M H  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 3CZS)  
{ z9 ($.  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ uM S*(L_  
  SaveBmp(); sn{tra  
  return FALSE; Mu&x_&|  
} y{=>$C[  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ZA820A>2!  
 CMenu pop; |5MbAqjzC  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); t'(1I|7  
 CMenu*pMenu=pop.GetSubMenu(0); @dEiVF`4:  
 pMenu->SetDefaultItem(ID_EXITICON); 75NRCXh.  
 CPoint pt; AK@L32-S  
 GetCursorPos(&pt); ."6[:MF  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); <]d LX}C)  
 if(id==ID_EXITICON) E=w3=\JP  
  DeleteIcon(); nc?B6IV  
 else if(id==ID_EXIT) lm0N5(XP  
  OnCancel(); c$h9/H=~  
 return FALSE; h"W8N+e\  
} 5zB~4u  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); g0&\l}&%U  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) a9Y5  
 AddIcon(); @_yoX(.E&  
 return res; lFq{O;q7}  
} +!yX T C  
bw S*]!*  
void CCaptureDlg::AddIcon() z&}-8JykH  
{ (f#b7O-Wn  
 NOTIFYICONDATA data; n}nEcXb  
 data.cbSize=sizeof(NOTIFYICONDATA); uY#TEjGh]  
 CString tip; ?Bx./t><  
 tip.LoadString(IDS_ICONTIP); ]A+o>#n}x  
 data.hIcon=GetIcon(0); Es4qPB`g.  
 data.hWnd=GetSafeHwnd(); lpm JLH.F  
 strcpy(data.szTip,tip); ] d?x$>  
 data.uCallbackMessage=IDM_SHELL; S Xr%kndS  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 9pD 7 f`  
 data.uID=98; #R&H &1  
 Shell_NotifyIcon(NIM_ADD,&data); X#p Wyo~  
 ShowWindow(SW_HIDE); TqAPAHg  
 bTray=TRUE; BmBz}:xMez  
} %X1x4t]  
z`3( ,V  
void CCaptureDlg::DeleteIcon() (z7+|JE.  
{ `/IKdO*!S  
 NOTIFYICONDATA data; q|(W-h+  
 data.cbSize=sizeof(NOTIFYICONDATA); kOrl\_!z3  
 data.hWnd=GetSafeHwnd(); !0}\&<8/m  
 data.uID=98; WO*9+\[v  
 Shell_NotifyIcon(NIM_DELETE,&data); LKF/u` 0dP  
 ShowWindow(SW_SHOW); ^J/)6/TMXm  
 SetForegroundWindow(); k$i'v:c|:i  
 ShowWindow(SW_SHOWNORMAL); =o7}]k7  
 bTray=FALSE; 4P8*k[.  
} Jjm|9|C,  
l*=aMjd?  
void CCaptureDlg::OnChange() EqB)sK/3  
{ N{Qxq>6 G  
 RegisterHotkey(); ,xsH|xW  
} nE W31 8  
;;U :Jtn2  
BOOL CCaptureDlg::RegisterHotkey() 9Kv|>#zff  
{ b[ w;i]2  
 UpdateData(); !CY&{LEYn0  
 UCHAR mask=0; q_fam,9  
 UCHAR key=0; }JgYCsF/f  
 if(m_bControl) 8|g<X1H{M  
  mask|=4; 8y2+&#$  
 if(m_bAlt) }IaA7f  
  mask|=2; ]uh3R{a/  
 if(m_bShift) LHYLC>J  
  mask|=1; X$n(-65  
  key=Key_Table[m_Key.GetCurSel()]; nv/[I,nw  
 if(bRegistered){ 7/Il L  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 3iNkoBCg  
  bRegistered=FALSE; $lwz-^1t.  
 } )%Iv[TB[  
 cMask=mask; YwDt.6(+,  
 cKey=key; N_gD>6I  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Bi%x`4Lf  
 return bRegistered; 1NLg _UBOK  
} `ldz`yu6++  
~/#1G.H  
  四、小结 mTDVlw0dh  
e@<?zS6  
  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。
评价一下你浏览此帖子的感受

精彩

感动

搞笑

开心

愤怒

无聊

灌水
描述
快速回复

您目前还是游客,请 登录注册
如果您在写长篇帖子又不马上发表,建议存为草稿
认证码:
验证问题:
3+5=?,请输入中文答案:八 正确答案:八