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
  • 4895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: t+ ,'  
  e|t@"MxvC  
  一、实现方法 <? Z[X{  
:?2@qWaL  
  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: `Mh 3v@K:  
p-6Y5$Y  
#pragma data_seg("shareddata") YKUb'D:t]  
HHOOK hHook =NULL; //钩子句柄 va>u1S<lO  
UINT nHookCount =0; //挂接的程序数目 B=>VP-:  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 o4%H/|Oq.  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 /e2CB"c   
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey  ^n5rUwS>  
static int KeyCount =0; nE 2w ?  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 wNk 0F7Ck  
#pragma data_seg() 9_h  V1:  
_V.MmA  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 IzuYkl}  
0:CIM  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: a7]wPXKq  
prWK U  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Q.]$t 2J  
cKey,UCHAR cMask) s9Tp(Yr,k  
{ '^npZa'%sW  
 BOOL bAdded=FALSE; U9*uXD1\  
 for(int index=0;index<MAX_KEY;index++){ Z}8khNCYr  
  if(hCallWnd[index]==0){ y:m ;_U,%c  
   hCallWnd[index]=hWnd; z(8:7 G  
   HotKey[index]=cKey; \6{w#HsP8  
   HotKeyMask[index]=cMask; (R9{wGV [  
   bAdded=TRUE; `/"rs@  
   KeyCount++; 17 k9h?s*  
   break; Sj[iKCEKtv  
  } =T?:b8yV  
 } R2e":`0I  
 return bAdded; *N C9S,eSP  
} /.1yxb#Z?,  
//删除热键 >!D^F]CH  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) iF_#cmSy$  
{ 3tt3:`g  
 BOOL bRemoved=FALSE; HGwSsoS  
 for(int index=0;index<MAX_KEY;index++){ Q{:5gh  
  if(hCallWnd[index]==hWnd){ c*k%r2'  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ;v*J:Mn/=  
    hCallWnd[index]=NULL; (}#8$ )  
    HotKey[index]=0; )F$<-0pT  
    HotKeyMask[index]=0; #[uDVCM  
    bRemoved=TRUE; ]gw[ ~  
    KeyCount--; InAx;2'A:  
    break; 9W7 ljUg  
   } Wq+a5[3"  
  } wm'a)B?  
 } t1Zcr#b>  
 return bRemoved; ~YH'&L.O  
} +sW;p?K7eO  
mw\ z'  
:j)v=qul  
  DLL中的钩子函数如下: 1@i|[dq  
`<"@&N^d  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) |#Gug('  
{ F=B[%4q`%  
 BOOL bProcessed=FALSE; pGsk[.  
 if(HC_ACTION==nCode) k6}M7 &nY  
 { Fad.!%[  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 mRNA,*  
   switch(wParam) js$L<^7  
   {  _,ki/7{  
    case VK_MENU:  s-Z<  
     MaskBits&=~ALTBIT; j6JK4{  
     break; '#oNOU  
    case VK_CONTROL: Rs +),  
     MaskBits&=~CTRLBIT; F%]Z yO9  
     break; <TDp8t9bU  
    case VK_SHIFT: -5 Q gJ  
     MaskBits&=~SHIFTBIT; B&M-em=  
     break; Jn#05Z  
    default: //judge the key and send message Z)7|m  
     break; pnpx`u;  
   } 4#D<#!]^  
   for(int index=0;index<MAX_KEY;index++){ 7~I*u6zY  
    if(hCallWnd[index]==NULL) t/kMV6  
     continue; w<P$)~6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) wAvnj  
    { e!B>M{  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ^E#i5d+'N  
     bProcessed=TRUE; . XVW2ISv  
    } it#,5#Y:  
   } \ ";^nk*  
  } n9w(Z=D\  
  else if((lParam&0xc000ffff)==1){ //有键按下 na4^>:r~  
   switch(wParam) u^ 3,~:E  
   { JQ~[$OGH  
    case VK_MENU: 6z'3e\x  
     MaskBits|=ALTBIT; SZ&I4-  
     break; 7:S4 Ur  
    case VK_CONTROL: )ZQ>h{}D  
     MaskBits|=CTRLBIT; gic!yhsS_  
     break; ]_EJ "'x  
    case VK_SHIFT: \,ko'4 8@  
     MaskBits|=SHIFTBIT; B*3<(eI  
     break; ,pHQv(K/  
    default: //judge the key and send message %@~;PS3kd  
     break; TpH-_ft  
   } L|*0 A=6  
   for(int index=0;index<MAX_KEY;index++){ Dga;GYx  
    if(hCallWnd[index]==NULL) (X3}&aLF  
     continue; 9 \lSN5W  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~ubcD6f  
    { DmA~Vj!a^y  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); N+9W2n  
     bProcessed=TRUE; ?s-Z3{k  
    } 5{Oq* |  
   } wR%F>[ 6.{  
  } DCheG7lo{  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 s$wIL//=  
   for(int index=0;index<MAX_KEY;index++){ }HKt{k&$  
    if(hCallWnd[index]==NULL) Mjj5~by:  
     continue; Pl\r|gS;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) QUO'{;,  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); >3qfo2K 0  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 csd~)a nb  
   } GD -cP5$  
  } Zn{Y+ce7d  
 } {u (( y D  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); TCLXO0  
} Pea2ENe3  
@km@\w  
  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: Klj -dz  
uf/4vz,  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 2CY4nS KW  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &~K4I  
M?ObK#l!_  
  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: 8:sQB% BB  
]/6i#fTw  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) =MjkD)l  
{ v1VH&~e  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) %nV6#pr  
 { 1$#1  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 8n"L4jb(:  
  SaveBmp(); {bP )Fon  
  return FALSE; [lz#+~rOS  
 } \n<9R8g5  
 …… //其它处理及默认处理 m FgrT  
} Z'!i"Jzq|{  
?_t_rF(?6  
:lBw0{fP  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 kQw%Wpuq[/  
#;])/8R%  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 NyR,@n1  
H{et2J<H  
  二、编程步骤 B(1WI_}~  
cfC}"As  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; V)Sw\tS6g  
7SJbrOL4Q-  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ;u*I#)7  
I&wJK'GM`  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 2)MX<prH  
?D_^8\R  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; E;rS"'D:  
Y.b?.)u&  
  5、 添加代码,编译运行程序。 ufn% sA  
t\XA JU  
三、程序代码 dJF3]h Y  
1}Th@Vq  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL k!"6mo@rd  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) [:gp_Z&  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ,v#O{ma  
#if _MSC_VER > 1000 }B ?_>0  
#pragma once M)"'Q6ck=  
#endif // _MSC_VER > 1000 @gnLY  
#ifndef __AFXWIN_H__ jR2^n`D  
#error include 'stdafx.h' before including this file for PCH O~#A )d6  
#endif HV=P! v6  
#include "resource.h" // main symbols 1$)}EL   
class CHookApp : public CWinApp >+9:31p  
{ e8 1+as  
 public: ix_&os]L_  
  CHookApp(); "9X1T]  
  // Overrides 8gxo{<,9  
  // ClassWizard generated virtual function overrides |)y-EBZe\"  
  //{{AFX_VIRTUAL(CHookApp) KP)t,\@f!  
 public: %z6_,|%  
  virtual BOOL InitInstance(); mEg3.|  
  virtual int ExitInstance(); `O]$FpO  
  //}}AFX_VIRTUAL <<PXh&wu0  
  //{{AFX_MSG(CHookApp) S1o[)q   
  // NOTE - the ClassWizard will add and remove member functions here. }z F,dst  
  // DO NOT EDIT what you see in these blocks of generated code ! #Q"04'g  
  //}}AFX_MSG ( TJGJY  
  DECLARE_MESSAGE_MAP() 9Cs/B*3)b  
}; wv  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 1T}jK^"  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); NpH9}, 1i  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 2 b80b50  
BOOL InitHotkey(); %)w7t[A2D  
BOOL UnInit(); AAF']z<4_"  
#endif B:VGa<lx5  
=wMq!mBd  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Z#%s/TL  
#include "stdafx.h" I23"DBR3  
#include "hook.h" ~(`&hYE  
#include <windowsx.h> NQcNY=  
#ifdef _DEBUG aMJJ|iiU  
#define new DEBUG_NEW vDIsawbHD  
#undef THIS_FILE QIfP%,LT  
static char THIS_FILE[] = __FILE__; 88VI _<  
#endif /*(&Dmt>  
#define MAX_KEY 100 D67z6jep(  
#define CTRLBIT 0x04 j dkqJ4&i  
#define ALTBIT 0x02 %6la@i  
#define SHIFTBIT 0x01 u s8.nL/  
#pragma data_seg("shareddata") \olY)b[  
HHOOK hHook =NULL; Z>[n~{-,p  
UINT nHookCount =0; 0|kH0c,T-  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 8p#V4liE  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT E.,  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey BP@V:z  
static int KeyCount =0; KMx '(  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift uNca@xl'  
#pragma data_seg() -^JPY)\R  
HINSTANCE hins; A{Qo}F<*  
void VerifyWindow(); a- lF}P\  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) kDG?/j90D  
//{{AFX_MSG_MAP(CHookApp) /!sGO:  
// NOTE - the ClassWizard will add and remove mapping macros here. OBf$Z"i  
// DO NOT EDIT what you see in these blocks of generated code! X/ Ii}X/p  
//}}AFX_MSG_MAP qIxe)+.  
END_MESSAGE_MAP() ,<$rSvMfg  
IP^1ca#<  
CHookApp::CHookApp() 5cb8=W -  
{ b3ys"Vyn  
 // TODO: add construction code here, Z>~7|vl  
 // Place all significant initialization in InitInstance :1;"{=Yx}  
} 6]mAtA`Y  
Z= =c3~  
CHookApp theApp; y Z)-=H  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) p^w_-( p  
{ H`,t"I  
 BOOL bProcessed=FALSE; b#*"eZj  
 if(HC_ACTION==nCode) .hjN*4RY  
 { K1w:JA6(  
  if((lParam&0xc0000000)==0xc0000000){// Key up L) UCVm  
   switch(wParam) 2t?Vl%<  
   { =7EkN% V:{  
    case VK_MENU: )6%a9&~H  
     MaskBits&=~ALTBIT; `Ue5;<K-/  
     break; j Y(|z*|  
    case VK_CONTROL: ]MC5 uKn  
     MaskBits&=~CTRLBIT; [ #fz [U  
     break; k\RS L  
    case VK_SHIFT: CSH*^nk':O  
     MaskBits&=~SHIFTBIT; !b$]D?=}  
     break; I|Mw*2U  
    default: //judge the key and send message qfRrX"  
     break; .*Z#;3  
   } .EC~o  
   for(int index=0;index<MAX_KEY;index++){ Y?-Ef sK  
    if(hCallWnd[index]==NULL) {"*_++|  
     continue; >>cL"m  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) n]t3d  
    { LP/SblE  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); a*t>Ks'C  
     bProcessed=TRUE; LYiIJAZ.  
    } D~M*]&  
   } |E;+j\   
  } 0U !&|i\  
  else if((lParam&0xc000ffff)==1){ //Key down -j@IDd7  
   switch(wParam) ^])s\a$  
   { \odns  
    case VK_MENU: $~\Tl:!#?  
     MaskBits|=ALTBIT; 7X>*B~(R  
     break; wh!8\9{g  
    case VK_CONTROL: ZZ/k7(8  
     MaskBits|=CTRLBIT; Y~w1_>b  
     break; :  @$5M  
    case VK_SHIFT: $LG.rJ/*  
     MaskBits|=SHIFTBIT; ENI|e,'[  
     break; .HRd6O;  
    default: //judge the key and send message iBmvy 7S?  
     break; 8"A0@fNz  
   } +11 oVW  
   for(int index=0;index<MAX_KEY;index++) KUC%Da3  
   { "rVM23@ tq  
    if(hCallWnd[index]==NULL) " t?44[  
     continue; Hz=s)6$ey  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *?VB/yO=0  
    { ~6+Um_A_L  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); c:+UC  
     bProcessed=TRUE; H%Z;Yt8^gt  
    } -:~z,F  
   } hLVgP&/ E  
  } shO4>Ha  
  if(!bProcessed){ \FF|b"E_=  
   for(int index=0;index<MAX_KEY;index++){ ",' Zr<T  
    if(hCallWnd[index]==NULL) V;Q@' <w  
     continue; Wys$#pJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) #4!f/dWJp  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); l<'}`  
   } $`R=Q  
  } U[:=7UABU?  
 } +{}p(9w@  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); [&l+Ve(  
} w2jB6NQX  
zy.v[Y1!  
BOOL InitHotkey() .-[]po  
{ 1#8~@CQ ::  
 if(hHook!=NULL){ {Z1-B60P  
  nHookCount++; :a:m>S<~  
  return TRUE; +n)bWB%  
 } *}_i[6_\E  
 else WI.+9$1:P  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); %IDl+_j  
  if(hHook!=NULL) (`u+(M!^  
   nHookCount++; .4[M-@4+]  
  return (hHook!=NULL); ylDfr){  
} @}uo:b:Q  
BOOL UnInit() 44KWS~  
{ j&b<YPZ  
 if(nHookCount>1){ _Y$v=!fY&  
  nHookCount--; !3o/c w9  
  return TRUE; C4t~k  
 } EW3--33s  
 BOOL unhooked = UnhookWindowsHookEx(hHook); / Xv@g$  
 if(unhooked==TRUE){ y)TBg8Q  
  nHookCount=0; Bo1 t}#7  
  hHook=NULL; ,dF Y]  
 } 2vddx<&  
 return unhooked; dj}P|v/;z  
} 07:h4beT  
#-{ljjMQI  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) G^SDB!/@J  
{ NE3/>5  
 BOOL bAdded=FALSE; '#~Sb8   
 for(int index=0;index<MAX_KEY;index++){ z6h/C {  
  if(hCallWnd[index]==0){ ]BTISaL-R  
   hCallWnd[index]=hWnd; u'gsIuRJ  
   HotKey[index]=cKey; 6UuM `eu  
   HotKeyMask[index]=cMask; |uX&T`7?-  
   bAdded=TRUE; }.=@^-JBA5  
   KeyCount++; AJ6O>Euq  
   break; l1%*LyD  
  } Q8h=2YL  
 } PWyFys  
 return bAdded; +eop4 |Z  
} y+ izC+  
A2Iqn5  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) g91xUG  
{ ZS@R?  
 BOOL bRemoved=FALSE; vkW;qt}yO  
 for(int index=0;index<MAX_KEY;index++){ c:s[vghH^#  
  if(hCallWnd[index]==hWnd){ 6 \ %#=GG  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ZW 5FL-I  
    hCallWnd[index]=NULL; nE :Wl  
    HotKey[index]=0; =,08D^xY  
    HotKeyMask[index]=0; Tc|+:Usy  
    bRemoved=TRUE; %;J$ h^  
    KeyCount--; F$9+WS`c  
    break; 2%MS$Fto  
   } |Z$)t%'  
  } qSaCl6[Do  
 } E.^u:0:P  
 return bRemoved; k\ZU%"^J  
} $]?M[sL\N7  
W=2]!%3#  
void VerifyWindow() ;)sC{ "Jb  
{ 5 L-6@@/  
 for(int i=0;i<MAX_KEY;i++){ zCu+Oi6  
  if(hCallWnd!=NULL){ nQn=zbZ3  
   if(!IsWindow(hCallWnd)){ 9A}y^=!`  
    hCallWnd=NULL; Xj:\B] v]  
    HotKey=0; '%a:L^a?  
    HotKeyMask=0; (D\`:1g  
    KeyCount--; [&zSYmDk  
   } *P`k|-  
  } SW HiiF@  
 } :;Npk9P(N  
} nrM-\'  
'ztY>KVj  
BOOL CHookApp::InitInstance() ,{Z!T5 |  
{ 3v)`` n@  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); G@<[fO|Iam  
 hins=AfxGetInstanceHandle(); Su'l &]  
 InitHotkey(); T\Jm=+]c!  
 return CWinApp::InitInstance(); B;Co`o2  
} AQc9@3T~Bi  
:r&4/sN}<  
int CHookApp::ExitInstance() V<d`.9*}  
{ 'jKCAU5/0;  
 VerifyWindow(); |;YDRI  
 UnInit(); +V#dJ[,8;.  
 return CWinApp::ExitInstance(); d2g7 ,axi  
} '/X m%S  
gNh4c{Al9  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Nm3CeU  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) \r &(l1R  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 'tVe#oI  
#if _MSC_VER > 1000 Wa%p+(\<uB  
#pragma once X C '|  
#endif // _MSC_VER > 1000 <h`}I3Ao  
sT91>'&  
class CCaptureDlg : public CDialog 5J3K3  
{ t\\<+^[%  
 // Construction Qr~yHFc1y  
 public: ^K^rl 9  
  BOOL bTray; A.<M*[{q  
  BOOL bRegistered; >a: 6umY  
  BOOL RegisterHotkey(); z~;@Mo"*f  
  UCHAR cKey; +@\=v}: F  
  UCHAR cMask; IY|>'}UU#  
  void DeleteIcon(); P_M!h~  
  void AddIcon();  Lvn+EM  
  UINT nCount; _,*QJ  
  void SaveBmp(); #?bOAWAwLh  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 2*zMLI0.  
  // Dialog Data nB%[\LtZ?  
  //{{AFX_DATA(CCaptureDlg) }]j#C  
  enum { IDD = IDD_CAPTURE_DIALOG }; IZxr;\dq6  
  CComboBox m_Key; \Pd>$Q  
  BOOL m_bControl; H7Pw>Ta ;  
  BOOL m_bAlt; _No<fz8  
  BOOL m_bShift; 0Rh*SoYrC  
  CString m_Path; z@xkE ,j>  
  CString m_Number; u"kB`||(  
  //}}AFX_DATA s18A  
  // ClassWizard generated virtual function overrides Ia>~ph#]{`  
  //{{AFX_VIRTUAL(CCaptureDlg) :) T#.(mR  
 public: wgZ6|)!0  
  virtual BOOL PreTranslateMessage(MSG* pMsg); /tqe:*  
 protected: $XrX(l5  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Y,X0x-  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); A)kdY!}  
  //}}AFX_VIRTUAL CrX1qyR  
  // Implementation smuQ1.b  
 protected: GUsJF;;V  
  HICON m_hIcon; Ewo6Q){X  
  // Generated message map functions M =GF@C;b  
  //{{AFX_MSG(CCaptureDlg) ;-kg3fGB1Q  
  virtual BOOL OnInitDialog(); 05;J7T<  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); f7 zGz  
  afx_msg void OnPaint(); !]#;'  
  afx_msg HCURSOR OnQueryDragIcon(); +kOXa^K  
  virtual void OnCancel(); r6}-EYq=  
  afx_msg void OnAbout(); 7T=:dv  
  afx_msg void OnBrowse(); \0^Je>-:U  
  afx_msg void OnChange(); s%)>O{{)  
 //}}AFX_MSG \-:4TuU  
 DECLARE_MESSAGE_MAP() wmit>69S  
}; D}bCMN <  
#endif _Ns_$_  
'6Yx03t  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file .OD{^Kq2  
#include "stdafx.h" 4% 2MY\  
#include "Capture.h" dxF)) Z  
#include "CaptureDlg.h" ImI, q:[67  
#include <windowsx.h> i7xBi:Si  
#pragma comment(lib,"hook.lib") Bet?]4\_  
#ifdef _DEBUG EBplr ,  
#define new DEBUG_NEW 5f#]dgBe  
#undef THIS_FILE DbK-3F_  
static char THIS_FILE[] = __FILE__; );V.le}%(  
#endif 5<|X++y}8)  
#define IDM_SHELL WM_USER+1 bcFZ ~B  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); THnZbh4#)  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); P64< O 5l/  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; (Bu-o((N@0  
class CAboutDlg : public CDialog `HsI)RmX  
{ f.Ms3))  
 public: ')j@OO3  
  CAboutDlg(); 5=P*<Dnj  
  // Dialog Data Y/G~P,9  
  //{{AFX_DATA(CAboutDlg) n7'X.=o7  
  enum { IDD = IDD_ABOUTBOX }; Na_O :\x#  
  //}}AFX_DATA >3y:cPTM5  
  // ClassWizard generated virtual function overrides o$,e#q)8  
  //{{AFX_VIRTUAL(CAboutDlg) GhY MO6Q4  
 protected: l%MIna/Tp  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 0%]F&|  
  //}}AFX_VIRTUAL Z`kI6  
  // Implementation s;YuB#Z  
 protected: gJuA*^  
  //{{AFX_MSG(CAboutDlg) EY[J;H_b  
  //}}AFX_MSG RL1cx|  
  DECLARE_MESSAGE_MAP() 66Xo3 o  
}; Ea?u5$>gY"  
i^&^eg'.5  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) :<`po4/  
{ O `a4 ")R  
 //{{AFX_DATA_INIT(CAboutDlg) ^es/xt  
 //}}AFX_DATA_INIT TllIs&MCe  
} O\)rp!i  
A\~tr   
void CAboutDlg::DoDataExchange(CDataExchange* pDX) T &kr IZw  
{ R]Pv=fn  
 CDialog::DoDataExchange(pDX); M`.v/UQn  
 //{{AFX_DATA_MAP(CAboutDlg) {~eVZVv  
 //}}AFX_DATA_MAP ;bes#|^F  
} @ykM98K  
I0C$  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) [V.#w|n  
 //{{AFX_MSG_MAP(CAboutDlg) )nA fT0()0  
 // No message handlers Ct30EZ  
 //}}AFX_MSG_MAP zX ?@[OT  
END_MESSAGE_MAP() ~!TRR .  
##qs{s^ ]  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) :<>=,`vQD  
: CDialog(CCaptureDlg::IDD, pParent) ~> |o3&G{  
{ TTzvH;S  
 //{{AFX_DATA_INIT(CCaptureDlg) uOprA`3  
  m_bControl = FALSE; j43-YdCJ  
  m_bAlt = FALSE; @j?)uJ0Q  
  m_bShift = FALSE; ,.&y-?  
  m_Path = _T("c:\\"); uvj`r5ei  
  m_Number = _T("0 picture captured."); /|2 hW`G  
  nCount=0; YCEdt>5PA  
  bRegistered=FALSE; <GRrw  
  bTray=FALSE; MLn\ b0  
 //}}AFX_DATA_INIT :I^I=A%Pe(  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 B]|"ePj-  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); `f+l\'.s  
} e`Vb.E)  
AH#klYK  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) uO;_T/^u  
{ T_*R^Ukb5  
 CDialog::DoDataExchange(pDX); $oU40HA)W]  
 //{{AFX_DATA_MAP(CCaptureDlg) OMVK\_oXo  
  DDX_Control(pDX, IDC_KEY, m_Key); UFY_.N~  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 7Q3a0`Iq  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Fb9!x/$tGV  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 7!"OF  
  DDX_Text(pDX, IDC_PATH, m_Path); !`?*zf  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 6l-V% 3-  
 //}}AFX_DATA_MAP *T{P^q.s~[  
} o$+"{3svw?  
x*2'I  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) !/Wp0E'A  
//{{AFX_MSG_MAP(CCaptureDlg) 6Cd% @Q2cr  
 ON_WM_SYSCOMMAND() %>Y86>mVz  
 ON_WM_PAINT() ]S#m o  
 ON_WM_QUERYDRAGICON() beCTOmC  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ~]&,v|g&  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) l d4#jV ei  
 ON_BN_CLICKED(ID_CHANGE, OnChange) -<Zs7(  
//}}AFX_MSG_MAP Auz.wes  
END_MESSAGE_MAP() p?,:  
R#UcwX}o  
BOOL CCaptureDlg::OnInitDialog() ?go+oS^  
{ yDW$v/j.|  
 CDialog::OnInitDialog(); ^+20e3 ~Y  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); N]6M4j!  
 ASSERT(IDM_ABOUTBOX < 0xF000); szx7CP`<8  
 CMenu* pSysMenu = GetSystemMenu(FALSE); W4~:3 Sk  
 if (pSysMenu != NULL) Ot#O];3  
 { b 5X~^L  
  CString strAboutMenu; :RE.md  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Ysz&/ry  
  if (!strAboutMenu.IsEmpty()) ApxGrCu  
  { lYq4f|5H}m  
   pSysMenu->AppendMenu(MF_SEPARATOR); s9'lw'  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Mk~]0d  
  } "]M]pR/j  
 } PA(XdT{  
 SetIcon(m_hIcon, TRUE); // Set big icon #- hYjE5  
 SetIcon(m_hIcon, FALSE); // Set small icon 8V$:th('  
 m_Key.SetCurSel(0); ,AO]4Ec  
 RegisterHotkey(); (d2|r)O  
 CMenu* pMenu=GetSystemMenu(FALSE); RiX~YL eM  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); u79,+H@ep  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ZfYva(zP{Q  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); )|?s!rw +  
 return TRUE; // return TRUE unless you set the focus to a control *6trK`tx^  
} /X_g[*]?  
`pzXh0}|  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) rL /e  
{ DZI:zsf;5Q  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) |3A/Og  
 { a*Oc:$  
  CAboutDlg dlgAbout; ,>rr|O  
  dlgAbout.DoModal(); Rr|&~%#z  
 } {:;599l  
 else *$I5_A8,.  
 { ;Xw'WMb*=  
  CDialog::OnSysCommand(nID, lParam); "+6:vhP5  
 } W+C@(}pt  
} "V;5Lp b  
feH|sz`e  
void CCaptureDlg::OnPaint() }Ra'`;D$  
{ v0yaFP#kG  
 if (IsIconic()) Uz`K#Bz   
 { y(!Y N7_A  
  CPaintDC dc(this); // device context for painting P~5[.6gW  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); )Uv lEG']  
  // Center icon in client rectangle !5;A.f  
  int cxIcon = GetSystemMetrics(SM_CXICON); jeM/8~^4-  
  int cyIcon = GetSystemMetrics(SM_CYICON); [8o!X)  
  CRect rect; t)*MLg<C  
  GetClientRect(&rect); R\B-cU[,  
  int x = (rect.Width() - cxIcon + 1) / 2; nf7l}^/UE  
  int y = (rect.Height() - cyIcon + 1) / 2; eXqS9`zKr  
  // Draw the icon d }"Dp  
  dc.DrawIcon(x, y, m_hIcon); Xo{|m[,  
 } Vg0$5@  
 else zIyMq3  
 { >J]^Rgn>  
  CDialog::OnPaint(); ^MUSq(  
 } _'yN4>=6u  
} RiY9[ec2  
AI|8E8h+D  
HCURSOR CCaptureDlg::OnQueryDragIcon() 0?tn.<'B8T  
{ 7eh<>X!TX  
 return (HCURSOR) m_hIcon; ?5A!/`E&%  
} ,&1DKx  
d&dp#)._8  
void CCaptureDlg::OnCancel() /"Bm1  
{ j}2,|9ne  
 if(bTray) $:#{Y;d  
  DeleteIcon(); 8%dE$smH  
  CDialog::OnCancel(); ){PL6|5x  
} me+F0:L  
y3]7^+k  
void CCaptureDlg::OnAbout() )L*6xTa~  
{ {PXN$p:'  
 CAboutDlg dlg; hf/6VlZ  
 dlg.DoModal(); t_-1sWeA!  
} [q/tKdo@  
\Qh{uk[  
void CCaptureDlg::OnBrowse()  f:_\S  
{ {g:I5 A#  
 CString str; ndIf1}   
 BROWSEINFO bi; 39|4)1e  
 char name[MAX_PATH]; bvf}r ,`Q7  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); )jh4HMvmC  
 bi.hwndOwner=GetSafeHwnd(); &: i|;^^2  
 bi.pszDisplayName=name; "gcHcboU5$  
 bi.lpszTitle="Select folder"; S+mZ.aFS0z  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ~i4h.ZLj  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 1mLd_ ]F'F  
 if(idl==NULL) cH&-/|N  
  return; t4a/\{/#9|  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); #+v Iq?  
 str.ReleaseBuffer(); oA^aT:o +  
 m_Path=str; SIBNU3;DL  
 if(str.GetAt(str.GetLength()-1)!='\\') bOt6q/f  
  m_Path+="\\"; 1<y|,  
 UpdateData(FALSE); .o(XnY)cgJ  
} C6=P(%y  
_Ra$"j  
void CCaptureDlg::SaveBmp() Vt {uG  
{ 'w?*4H  
 CDC dc; _%M5 T  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 7fVlA"x  
 CBitmap bm; hP=^JH  
 int Width=GetSystemMetrics(SM_CXSCREEN); 6^vMJ82U  
 int Height=GetSystemMetrics(SM_CYSCREEN); JF%eC}[d  
 bm.CreateCompatibleBitmap(&dc,Width,Height); I.[2-~yf  
 CDC tdc; D;pfogK @  
 tdc.CreateCompatibleDC(&dc); gy Jx>i  
 CBitmap*pOld=tdc.SelectObject(&bm); 5Av bKT  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); YceX)  
 tdc.SelectObject(pOld); :N \j@yJK  
 BITMAP btm; U#I 8Rd I,  
 bm.GetBitmap(&btm); p7UdZOi2  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; `aj;FrF  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 7X h'VOljB  
 BITMAPINFOHEADER bih; Op&i6V}<s  
 bih.biBitCount=btm.bmBitsPixel; 3;wAm/Z:Q  
 bih.biClrImportant=0; }r}$8M+1  
 bih.biClrUsed=0; }tvLe3O  
 bih.biCompression=0; l\PDou@5  
 bih.biHeight=btm.bmHeight; j4ARGkK5B  
 bih.biPlanes=1; MeXzWLH  
 bih.biSize=sizeof(BITMAPINFOHEADER); bbDl?m&bq  
 bih.biSizeImage=size; GOT@  
 bih.biWidth=btm.bmWidth; (v11;kdJB  
 bih.biXPelsPerMeter=0; WOW:$.VO^  
 bih.biYPelsPerMeter=0; r#ISIgJXG  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); p;[">["  
 static int filecount=0; 3D)gy9T&l  
 CString name; 7oj ^(R,  
 name.Format("pict%04d.bmp",filecount++); G:W4<w  
 name=m_Path+name; t% -"h|  
 BITMAPFILEHEADER bfh; %h)6o99{wF  
 bfh.bfReserved1=bfh.bfReserved2=0; <oweLRt  
 bfh.bfType=((WORD)('M'<< 8)|'B'); BT|5"b}  
 bfh.bfSize=54+size; Q>jx`68'KI  
 bfh.bfOffBits=54; ~uF%*  
 CFile bf; K.y2 $b/  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ C+, JLK  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); pvCf4pf~  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Q\pTyNAYn  
  bf.WriteHuge(lpData,size); OLThi[Yn  
  bf.Close(); cQ= "3M)~r  
  nCount++; RTPxAp+\5  
 } ::k>V\;  
 GlobalFreePtr(lpData); ra="4T$va  
 if(nCount==1) k<1BE^[V  
  m_Number.Format("%d picture captured.",nCount); DB1GW,  
 else 0q|.]:][Eo  
  m_Number.Format("%d pictures captured.",nCount); Fap@cW3?8  
  UpdateData(FALSE); BoJYP  
} >k:BG{$Kae  
IO,ddVO  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) YL(7l|^!  
{ 85>WK+=  
 if(pMsg -> message == WM_KEYDOWN) 9ANC,+0p  
 { aq'd C=y  
  if(pMsg -> wParam == VK_ESCAPE) ikr|P&e#u  
   return TRUE; /%El0X  
  if(pMsg -> wParam == VK_RETURN) gk"0r\Eq  
   return TRUE; L*;XjacI]  
 } 4 1w*<{Lk  
 return CDialog::PreTranslateMessage(pMsg); 7MRu=Z.-b  
} Gi7jgv{{  
t7A '  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 3~zK :(  
{ ~]+-<O^U~  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 1ga-8&!  
  SaveBmp(); ]:lqbg[J  
  return FALSE; 1`t4wD$/  
} t`PA85.|d  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ~i`@  
 CMenu pop; [@SLt$9"  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 4dkU;Ob  
 CMenu*pMenu=pop.GetSubMenu(0); AJ0qq  
 pMenu->SetDefaultItem(ID_EXITICON); ]_cBd)3P}  
 CPoint pt; YeN /J.R  
 GetCursorPos(&pt); ttEQgkd`  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Y^zL}@  
 if(id==ID_EXITICON) G k'j<a  
  DeleteIcon(); <SiD m-=E  
 else if(id==ID_EXIT) 7@[3]c<=  
  OnCancel(); d>ltL`xn  
 return FALSE; %9|}H [x  
} ',?9\xEB  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Q o}&2m  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) e-$ U .cx  
 AddIcon(); %+PWcCmn  
 return res; z93HTy9  
} b`x7%?Qn  
P3w]PG@  
void CCaptureDlg::AddIcon() ('!{kVLT-  
{ :}r^sD  
 NOTIFYICONDATA data; nWTo$*>W  
 data.cbSize=sizeof(NOTIFYICONDATA); HOWm""IkB  
 CString tip; Au+SCj  
 tip.LoadString(IDS_ICONTIP); g[VVxp!C<  
 data.hIcon=GetIcon(0); 6pkZ8Vp:  
 data.hWnd=GetSafeHwnd(); 5O.dRp7d J  
 strcpy(data.szTip,tip); $=>(7 =l_  
 data.uCallbackMessage=IDM_SHELL; b;wf7~a*  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; "AN2K  
 data.uID=98; %GRD3S  
 Shell_NotifyIcon(NIM_ADD,&data); {@T8i ^EI  
 ShowWindow(SW_HIDE); =@#[@Ia  
 bTray=TRUE; %O 5 k+~9  
} ./_o+~\e'  
W)3IS&;P  
void CCaptureDlg::DeleteIcon() @agW{%R:.  
{ v 4@=>L  
 NOTIFYICONDATA data; 1<hj3  
 data.cbSize=sizeof(NOTIFYICONDATA); Qr`WPTQr"  
 data.hWnd=GetSafeHwnd(); 9zdp 8?T  
 data.uID=98; C4Pi6.wf  
 Shell_NotifyIcon(NIM_DELETE,&data); # 2As-9  
 ShowWindow(SW_SHOW); vn n4  
 SetForegroundWindow(); _xgF?#  
 ShowWindow(SW_SHOWNORMAL); ML6V,V/e  
 bTray=FALSE; yNY *Fl!  
} K6#9HF'2I  
7X3<8:%  
void CCaptureDlg::OnChange() @(XX68  
{  &Gp~)%  
 RegisterHotkey(); x+j5vzhG)  
} t`b>iX%(1t  
->DfT*)  
BOOL CCaptureDlg::RegisterHotkey() cY+vnQm  
{ y %dUry%>  
 UpdateData(); Fs^d-I  
 UCHAR mask=0; "Aw| 7XII  
 UCHAR key=0; \;0J6LBc  
 if(m_bControl) q 6Q;9,  
  mask|=4; [al,UO  
 if(m_bAlt) __U;fH{c  
  mask|=2; F$ kLft[:  
 if(m_bShift) TGnyN'P|  
  mask|=1; s>E u[ uA  
  key=Key_Table[m_Key.GetCurSel()]; Dp:u!tdbeg  
 if(bRegistered){ =}S*]Me5  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); O.7Q* ^_  
  bRegistered=FALSE; 8'=8!V  
 } @Q:5{?  
 cMask=mask; NTRw:'  
 cKey=key; SB#YV   
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 0- GA,I_  
 return bRegistered; .r9-^01mG  
} :tP:X+?O  
],ow@}  
  四、小结 ,BM6s,\  
9*!C|gC9Ia  
  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
批量上传需要先选择文件,再选择上传
认证码:
验证问题:
3+5=?,请输入中文答案:八 正确答案:八