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
  • 6847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: ;OD+6@Sr  
  M +Jcg b]  
  一、实现方法 9 &p;2/H  
*&sXC@^@^  
  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: Oxq} dX7S  
*Qe{CE  
#pragma data_seg("shareddata") Z5%TpAu[  
HHOOK hHook =NULL; //钩子句柄 }$T!qMst{  
UINT nHookCount =0; //挂接的程序数目 ?~#{3b  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 'p:L"L}Q?  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 aq<QKn U  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey hDc)\vzr  
static int KeyCount =0; [tY+P7j9)  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Yvbk[Rb  
#pragma data_seg() <;.->73E  
08JVX'X-mr  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 .vJ t&@NO  
cA]Ch>]A%  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: wc6v:,&  
&6}] v:  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR z~+gche>  
cKey,UCHAR cMask) |nTZ/MXbw  
{ %V&I${z  
 BOOL bAdded=FALSE; 1[Ffl^\ARp  
 for(int index=0;index<MAX_KEY;index++){ JD1D(  
  if(hCallWnd[index]==0){ $bi@,&t;  
   hCallWnd[index]=hWnd; m"RE[dQ  
   HotKey[index]=cKey; >i IUS  
   HotKeyMask[index]=cMask; ":upo/xN  
   bAdded=TRUE; L.M|o  
   KeyCount++; q\gvX 76a  
   break; ZRr S""V  
  }  ;%tu;  
 } :\+\/HTbh  
 return bAdded; oy!Dm4F  
} %/(>>*}Kw|  
//删除热键 \r+8}8  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) G oJ\6& "  
{ A}cGag+sp  
 BOOL bRemoved=FALSE; {f }4l  
 for(int index=0;index<MAX_KEY;index++){ byUz  
  if(hCallWnd[index]==hWnd){ qn4jy6  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ z LHE;  
    hCallWnd[index]=NULL; G B &+EZ  
    HotKey[index]=0; FTfejk!  
    HotKeyMask[index]=0; H D95>%  
    bRemoved=TRUE; _2C[F~ +l  
    KeyCount--; ]A2l%V_7  
    break; .0zNt  
   } sXaIQhZ  
  } /P-Eg86V'  
 } umo@JWr  
 return bRemoved; fsDwfwil*  
} CN"hx-f  
ugI9rxT]Kv  
]2Q:&T  
  DLL中的钩子函数如下: C*I~14  
3h|:ew[  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) bkgJz+u  
{ P5*~ Wi`  
 BOOL bProcessed=FALSE; Ydr/ T/1  
 if(HC_ACTION==nCode) eHjn<@  
 { rHWlv\+N n  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 pwvcH3l/r  
   switch(wParam) oIP<7gz  
   {  Lz9t9AoB  
    case VK_MENU: Q< q&a8~  
     MaskBits&=~ALTBIT; 2"~QI xY=  
     break; oT\u^WU  
    case VK_CONTROL: -b4#/q+bb+  
     MaskBits&=~CTRLBIT; LJ|2=lI+jb  
     break; e:~r_,K  
    case VK_SHIFT: iJrF$Xw  
     MaskBits&=~SHIFTBIT; .#] V5g,  
     break; R""P01IZH  
    default: //judge the key and send message oVLgHB\zL  
     break; URodvyD  
   } t TAql n|  
   for(int index=0;index<MAX_KEY;index++){ jB17]OCN  
    if(hCallWnd[index]==NULL) H -sJt:  
     continue; 1.Ximom  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8SGFzb! h  
    { BF_R8H,<%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); RG)!v6  
     bProcessed=TRUE; @KhDQ0v]5  
    } aJC,  
   } +hIStA  
  } }!i#1uHUH:  
  else if((lParam&0xc000ffff)==1){ //有键按下 w< hw>e^.  
   switch(wParam) KKd S h1  
   { )-_]y|/D:r  
    case VK_MENU: OeuM9c{  
     MaskBits|=ALTBIT; WUM&Lq k"  
     break; %U&O \GB  
    case VK_CONTROL: {/C \GxH+  
     MaskBits|=CTRLBIT; 5xm^[o2#y  
     break; }T?0/N3y&  
    case VK_SHIFT: wW~y?A"{2  
     MaskBits|=SHIFTBIT; q}PeXXH  
     break; H?~|Uj 6  
    default: //judge the key and send message zw`T^N#  
     break; c7[<X<yk  
   } <#s=78 g.3  
   for(int index=0;index<MAX_KEY;index++){ L* Mt/  
    if(hCallWnd[index]==NULL) :D>afC8,  
     continue; (hB&OP5Fne  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9U_uw Rv2  
    { t?:}bw+m  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); H+`s#'(i_P  
     bProcessed=TRUE; (RR:{4I  
    } Zr0bVe+h  
   } @hlT7C)xK  
  } |&+0Tg~ZE  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Fq6sl}b(On  
   for(int index=0;index<MAX_KEY;index++){ y\DR,$Py  
    if(hCallWnd[index]==NULL) 9 wun$!>&  
     continue; =kz(1Pb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) "F(LTppy  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); i(^&ZmG  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 9+G.86Iky  
   } I+,~pmn:  
  } v`"z  
 } S`oADy  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); O\h*?, )  
} /Q4TQ\:  
(j^Qa~{mG4  
  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: 4aAuE0  
d%:B,bck  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 2NHkK_B1P  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); M^c`j#NQ  
U{vt9t  
  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: +>#SB"'  
v=A ]#O%  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) '~HCYE:5  
{ Zl69d4vG  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ?MT V!i0  
 { O,`#h*{N  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 @l)HX'z0d  
  SaveBmp();  2D;,'  
  return FALSE; L*xu<(>K  
 } b'9\j.By  
 …… //其它处理及默认处理 <9JI@\>  
} iGxlB  
.E'Tfa  
CdCo+U5z{  
  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。 B{UL(6\B  
eI8rnp( Ia  
  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。 DQ '=$z  
'- >%b  
  二、编程步骤 5OUGln5  
"~R,%sYb(  
  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}JiYZ  
{9kH<,PJ;!  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; S]E1+,-*  
A>@ i TI  
  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; Y}<w)b1e|  
uhi(Gny.  
  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; M#BM`2!s  
c418TjO;  
  5、 添加代码,编译运行程序。 J1@X6U!{  
UF3g]>*  
三、程序代码 ~=$0=)c  
J9!}8uD  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL )-D{]>8  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) C` s  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ; B4x>  
#if _MSC_VER > 1000 $#3O:aW  
#pragma once {}r#s>  
#endif // _MSC_VER > 1000 : GVyY]qBU  
#ifndef __AFXWIN_H__ 0E*q-$P  
#error include 'stdafx.h' before including this file for PCH ,$i2vGd  
#endif zX{O"w  
#include "resource.h" // main symbols SG:Fn8  
class CHookApp : public CWinApp PtH>I,/  
{ f{ ;L"*L  
 public: ,$"*X-1  
  CHookApp(); 7jss3^.wA  
  // Overrides xLxXc!{J5  
  // ClassWizard generated virtual function overrides >o=O^:/L  
  //{{AFX_VIRTUAL(CHookApp) H =Y7#{}  
 public: v2OK/W,0  
  virtual BOOL InitInstance(); V}?*kx~T2C  
  virtual int ExitInstance(); +m|S7yr'  
  //}}AFX_VIRTUAL ^|u7+b'|t  
  //{{AFX_MSG(CHookApp) 8|Wu8z--  
  // NOTE - the ClassWizard will add and remove member functions here. d']CBoK  
  // DO NOT EDIT what you see in these blocks of generated code ! <>=A6  
  //}}AFX_MSG }e/#dMEi  
  DECLARE_MESSAGE_MAP() v5 |XyN"  
};  F#0y0|  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); m2%OX"#e  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); B|\pzWD%  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1r!o,0!d-'  
BOOL InitHotkey(); M]FA y"E  
BOOL UnInit(); 6Z09)}tZb  
#endif :%_*C09  
(u/-ud1p  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. <ttrd%VW  
#include "stdafx.h" 'CF?pxNQ l  
#include "hook.h" UH8q:jOi  
#include <windowsx.h> S511}KPbm/  
#ifdef _DEBUG vBP 5n  
#define new DEBUG_NEW Sn6cwf9.s  
#undef THIS_FILE DC9\Sp?  
static char THIS_FILE[] = __FILE__;  fP+RuZ  
#endif 4b\R@Knu  
#define MAX_KEY 100 d@sAB1:  
#define CTRLBIT 0x04 ]2:w?+T  
#define ALTBIT 0x02 UweXz.x7  
#define SHIFTBIT 0x01 (d9G`  
#pragma data_seg("shareddata") 54X=58Q  
HHOOK hHook =NULL; *$%ch=  
UINT nHookCount =0; ;k W+  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey F0 .Rv):  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT WruSL|4iH  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey UY(pKe>  
static int KeyCount =0; 8C,}nh  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift y7f,]<%e_  
#pragma data_seg() tu4-##{  
HINSTANCE hins; }MUQO<=*  
void VerifyWindow(); 8iv0&91Z  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) &c?q#-^)\+  
//{{AFX_MSG_MAP(CHookApp) Sw1z^`  
// NOTE - the ClassWizard will add and remove mapping macros here. Q7 4Q|r7  
// DO NOT EDIT what you see in these blocks of generated code! /Bt+Ov3k  
//}}AFX_MSG_MAP )Y@E5Tuk>  
END_MESSAGE_MAP() r6JQRSakR  
H0!LiazA>  
CHookApp::CHookApp() v&7yqEm}B  
{ UF_?T.Rl^  
 // TODO: add construction code here, dBWi1vTF  
 // Place all significant initialization in InitInstance D)O2=aQ;]  
} hSl6 X3W  
O V"5:){  
CHookApp theApp; AVn?86ri  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) $Ph T:  
{ teQ <v[W.  
 BOOL bProcessed=FALSE; Q1Jw7R#?l  
 if(HC_ACTION==nCode) "b~-`ni  
 { Gy]ZYo(  
  if((lParam&0xc0000000)==0xc0000000){// Key up 6dH> 0l  
   switch(wParam) (+(YQ2  
   { J!\Cs1 !f  
    case VK_MENU: ]'.D@vFGO  
     MaskBits&=~ALTBIT; Kia34 ~W  
     break; !t;B.[U *  
    case VK_CONTROL: #<$pl]>}t  
     MaskBits&=~CTRLBIT; +.czj,Sq  
     break; *#n#J[  
    case VK_SHIFT: Z2t'?N|_  
     MaskBits&=~SHIFTBIT; 5WlBe c@  
     break; %%-?~rjI  
    default: //judge the key and send message qsA`\%]H  
     break; S9 p*rk ~  
   } ' ?4 \  
   for(int index=0;index<MAX_KEY;index++){ $D][_I  
    if(hCallWnd[index]==NULL) w\K(kNd(  
     continue; Wr j<}L|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) n<)gS7  
    { yQ [n7du  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); )yl;i  
     bProcessed=TRUE; ZwFVtR  
    } ! %~P[;.  
   } Hf$pwfGcY]  
  } \kR:GZ`{UV  
  else if((lParam&0xc000ffff)==1){ //Key down w/1Os!p  
   switch(wParam) B[$L)y'-;  
   { kB! iEoIBA  
    case VK_MENU: y/.I<5+Bu  
     MaskBits|=ALTBIT; M#u~]?hS  
     break; hifC.guK  
    case VK_CONTROL: E"'4=_  
     MaskBits|=CTRLBIT; (r9W[  
     break; J< vVsz+7:  
    case VK_SHIFT: 'kBq@>  
     MaskBits|=SHIFTBIT; dzbFUDJ  
     break; l-gNJ=l+K  
    default: //judge the key and send message BJDSk#!J!{  
     break; #5 %\~ f  
   } FJ+n- \  
   for(int index=0;index<MAX_KEY;index++) G m~2s;/  
   { 2(i@\dZCb<  
    if(hCallWnd[index]==NULL) h,fC-+H5  
     continue; (teK0s;t5k  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) mS9ITe M  
    { [uLpm*7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); i)1013b  
     bProcessed=TRUE; -V F*h.'  
    } gebDNl\Y2  
   } k .#I ;7  
  } 9Qb6ek  
  if(!bProcessed){ FoW|BGA~  
   for(int index=0;index<MAX_KEY;index++){ xbNL <3"a  
    if(hCallWnd[index]==NULL) <*3#nA-O>i  
     continue; '}, 8x?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) c}G\F$  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); =M],5<2;  
   } >(\Z-I&YQ  
  } ]kir@NMv>  
 } >Tp`Kri  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 2[X\*"MQ2  
} DedY(JOvB  
3EA+tG4KnO  
BOOL InitHotkey() 9=}&evGm89  
{ /=@V5)  
 if(hHook!=NULL){ U3^3nL-M9  
  nHookCount++; C@P*:L_  
  return TRUE; _@D"XL#L  
 } [Te"|K':  
 else IJk<1T7:(W  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 2uzy]faM  
  if(hHook!=NULL) >$:_M*5  
   nHookCount++; O$(#gB'B  
  return (hHook!=NULL); QB<~+d W  
} M\D25=(  
BOOL UnInit() TMG|"|  
{ 8D&yFal  
 if(nHookCount>1){ (7A-cC  
  nHookCount--; d",VOhW7)S  
  return TRUE; O gtrp)x9  
 } j2`%sBo  
 BOOL unhooked = UnhookWindowsHookEx(hHook); .L8g( F(=:  
 if(unhooked==TRUE){ 8zrLl:{  
  nHookCount=0; ?BnX<dbi&  
  hHook=NULL; uwc@~=;  
 } [;pL15-}4  
 return unhooked; W690N&Wz  
} K# kMz#B+i  
.H}#,pQ}l  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) .!)i    
{ a^7HI,  
 BOOL bAdded=FALSE;  uWkn}P  
 for(int index=0;index<MAX_KEY;index++){ *q*$%H  
  if(hCallWnd[index]==0){ \qkb8H  
   hCallWnd[index]=hWnd; 560`R>  
   HotKey[index]=cKey; bWg!/K55  
   HotKeyMask[index]=cMask; R*l3 zn>  
   bAdded=TRUE; 1'!%$D  
   KeyCount++; sP@7%p>wt  
   break; (2(y9r*1  
  } )?<V-,D  
 } BV)) #D9  
 return bAdded; vEc<|t  
} c+ukVn`r  
*:Uq ;)*  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 4G'-"u^g  
{ z#GrwE,r   
 BOOL bRemoved=FALSE; =h\uC).t&  
 for(int index=0;index<MAX_KEY;index++){ ziXI$B4-  
  if(hCallWnd[index]==hWnd){ N gagzsJ=  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Vtv1{/@+c  
    hCallWnd[index]=NULL; OjurfVw  
    HotKey[index]=0; jk{m8YP)E  
    HotKeyMask[index]=0; C#@-uo2  
    bRemoved=TRUE; B) BR y%  
    KeyCount--; o]aMhSol  
    break; jGEmf<q&u  
   } |F49<7XB[~  
  } fS]Z`U"  
 } /kV5~i<1S  
 return bRemoved; qZ%0p*P#_  
} er.;qV'Wz6  
,!QtViA7  
void VerifyWindow() xm0(U0 >  
{ ~Z}DN*S  
 for(int i=0;i<MAX_KEY;i++){ I_is3y0  
  if(hCallWnd!=NULL){ q"u,r6ED  
   if(!IsWindow(hCallWnd)){ 7`SrqI&  
    hCallWnd=NULL; c!a1@G  
    HotKey=0; ^+O97<#6C  
    HotKeyMask=0; B=HE i\55K  
    KeyCount--; %+oV-o\ #A  
   } =}%Q}aPp  
  } y]}N [l  
 } kC iOcl*$  
} Kidbc Z  
ri h@(;)1  
BOOL CHookApp::InitInstance() /hYFOZ  
{ XblZlWP#  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Xb.# =R  
 hins=AfxGetInstanceHandle(); +&[X7r<  
 InitHotkey(); w g^'oy  
 return CWinApp::InitInstance(); [6CWgQ%Ue  
} CcZM0  
@c=bH>Oz  
int CHookApp::ExitInstance() Yb?(Q %  
{ bd&Nf2  
 VerifyWindow(); NdB:2P  
 UnInit(); %=)%$n3=-M  
 return CWinApp::ExitInstance(); kudXwj  
} hR,5U=+M7  
^qNZ!V4T  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ,|?rt`8)Q  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) _VJG@>F9-  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ c@ lH  
#if _MSC_VER > 1000 [Uw3.CVh  
#pragma once Mo]  
#endif // _MSC_VER > 1000 d5'4RYfkQ  
!=?Q>mz  
class CCaptureDlg : public CDialog vk<4P;A(G  
{ cHon' tS  
 // Construction 6|Xm8,]yRw  
 public: m}]\^$d  
  BOOL bTray; ~b})=7n.  
  BOOL bRegistered; ztC>*SX  
  BOOL RegisterHotkey(); \R,8xID_t  
  UCHAR cKey; [_HOD^  
  UCHAR cMask; 3aFD*S  
  void DeleteIcon(); gp4@6HuUd  
  void AddIcon(); 5UvqE_  
  UINT nCount; _+d*ljP)l3  
  void SaveBmp(); xzBUm  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor :z2G a  
  // Dialog Data +THK Jn!>  
  //{{AFX_DATA(CCaptureDlg) aK--D2@}i  
  enum { IDD = IDD_CAPTURE_DIALOG }; <%m$ V5h  
  CComboBox m_Key; d_ji ..T  
  BOOL m_bControl; Rw|P$dbu  
  BOOL m_bAlt; +0M0g_sk  
  BOOL m_bShift; h"dn:5G:=  
  CString m_Path; N a<);Pg  
  CString m_Number; Hu"TEhW(2  
  //}}AFX_DATA I[P_j`aE  
  // ClassWizard generated virtual function overrides $ZRvvm!f  
  //{{AFX_VIRTUAL(CCaptureDlg) V L;<+C~  
 public: %18%T{|$e  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Z<`:xFy(  
 protected: k; ned  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support }r|$\ms  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); `vD.5  
  //}}AFX_VIRTUAL a7"Aq:IjU  
  // Implementation bf6:J `5Z  
 protected: ?L6pB]l8b  
  HICON m_hIcon; 2{4f>,][  
  // Generated message map functions 3zzl|+# 6  
  //{{AFX_MSG(CCaptureDlg) Ag} P  
  virtual BOOL OnInitDialog(); S&NWZ:E3[  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); newURb,-!  
  afx_msg void OnPaint(); @cn8m  
  afx_msg HCURSOR OnQueryDragIcon(); kNoS% ?1,  
  virtual void OnCancel(); )pG*_q  
  afx_msg void OnAbout(); 98lz2d/Fcq  
  afx_msg void OnBrowse(); "f>`ZFp^  
  afx_msg void OnChange(); N ZZc[P  
 //}}AFX_MSG !mK}Rim~  
 DECLARE_MESSAGE_MAP() y0,>_MS  
}; MbXtmQ%C8  
#endif `( _N9.>B  
`W2 o~r*&  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file xo#K_"E  
#include "stdafx.h" =$uSa7t#  
#include "Capture.h" F87c?Vh)K  
#include "CaptureDlg.h" 9S8V`aC  
#include <windowsx.h> TnJNs  
#pragma comment(lib,"hook.lib") C;']FmK]  
#ifdef _DEBUG VTK +aI  
#define new DEBUG_NEW /#!1  
#undef THIS_FILE uuYeXI;  
static char THIS_FILE[] = __FILE__; "6>+IF  
#endif 6@Ir|o  
#define IDM_SHELL WM_USER+1 B4x@{rtER  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Wx|De7*  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); uVa`2]NV r  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; &)!4rABn  
class CAboutDlg : public CDialog bOD] `*q  
{ ~;0W +  
 public: ~$m:j];  
  CAboutDlg(); r+,JM L   
  // Dialog Data \%QA)T%  
  //{{AFX_DATA(CAboutDlg) MC%!>,tC  
  enum { IDD = IDD_ABOUTBOX }; EKNmXt1 lE  
  //}}AFX_DATA N$M:&m3^  
  // ClassWizard generated virtual function overrides ,Gy2$mglB  
  //{{AFX_VIRTUAL(CAboutDlg) ]:~z#k|2@6  
 protected: 8JU{]Z!G<;  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support [I78<IJc  
  //}}AFX_VIRTUAL =" pNE#  
  // Implementation S+GW}?!  
 protected: CRu {Ie5B  
  //{{AFX_MSG(CAboutDlg) k<y~n*{_  
  //}}AFX_MSG {2L V0:k2  
  DECLARE_MESSAGE_MAP() >)VWXv0  
}; ;OSEMgB1  
>9t+lr1   
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) u^( s0q  
{ ^tI4FQ>Y  
 //{{AFX_DATA_INIT(CAboutDlg) E51S#T  
 //}}AFX_DATA_INIT o':K4r;  
} rs,:pU  
*.!532 7  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) |l:,EA_v|  
{ $'COsiK7  
 CDialog::DoDataExchange(pDX); M2LW[z  
 //{{AFX_DATA_MAP(CAboutDlg) &90pKs  
 //}}AFX_DATA_MAP N'YQ6U  
} rAS2qt  
Dp^6|T*HU  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) &_,.*tha  
 //{{AFX_MSG_MAP(CAboutDlg) rN`-ak  
 // No message handlers ftP]WGSS>  
 //}}AFX_MSG_MAP -gpHg  
END_MESSAGE_MAP() <"nF`'olV  
';I(#J6  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 8$38>cGY^  
: CDialog(CCaptureDlg::IDD, pParent) cX|(/h,W/  
{ c"zE  
 //{{AFX_DATA_INIT(CCaptureDlg) 60r0O5=|Fl  
  m_bControl = FALSE; -+kTw06_C  
  m_bAlt = FALSE; g|5cO3m0'  
  m_bShift = FALSE; C5=m~  
  m_Path = _T("c:\\"); L\\'n )  
  m_Number = _T("0 picture captured."); )5w#n1  
  nCount=0; 8r48+_y3u  
  bRegistered=FALSE; 9eEA80i7  
  bTray=FALSE; U\dLq&=V  
 //}}AFX_DATA_INIT @m9dB P  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 pXK-,7-  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); bM"d$tl$?'  
} @[~j|YH}  
_m3#g1m{  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) DlQ*'PX7  
{ Qk].^'\  
 CDialog::DoDataExchange(pDX); dl+:u}9M$  
 //{{AFX_DATA_MAP(CCaptureDlg) ogG:Ai)90  
  DDX_Control(pDX, IDC_KEY, m_Key); jk1mP6'P|  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); tW%!|T5/  
  DDX_Check(pDX, IDC_ALT, m_bAlt); nS]Ih0( K  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); [y(<1]i-a  
  DDX_Text(pDX, IDC_PATH, m_Path); OD).kP}s^  
  DDX_Text(pDX, IDC_NUMBER, m_Number); e]D TK*W~  
 //}}AFX_DATA_MAP 4']eJ==OH  
} 'y|p)r"  
_p0G8  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) /,JL \b  
//{{AFX_MSG_MAP(CCaptureDlg) !~te&ccPE  
 ON_WM_SYSCOMMAND() #Wely~  
 ON_WM_PAINT() $pj;CoPm  
 ON_WM_QUERYDRAGICON() h:4F?'W  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 'nfdOX.d  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) }nMp.7b  
 ON_BN_CLICKED(ID_CHANGE, OnChange) fPab%>/T{  
//}}AFX_MSG_MAP 4Vv$bbu+  
END_MESSAGE_MAP() #* Iyvx  
&@z M<A  
BOOL CCaptureDlg::OnInitDialog() +}Qq#^:_\  
{ A<[BR*n  
 CDialog::OnInitDialog(); Jf@~/!m}'  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); InB'Ag"  
 ASSERT(IDM_ABOUTBOX < 0xF000); 8 G:f[\^  
 CMenu* pSysMenu = GetSystemMenu(FALSE); !z"nJC  
 if (pSysMenu != NULL) 3EA`]&d>  
 { >?r8D48`  
  CString strAboutMenu; %B04|Q  
  strAboutMenu.LoadString(IDS_ABOUTBOX); C |P(,Xp  
  if (!strAboutMenu.IsEmpty()) #BhcW"@  
  { ;oVFcZSA  
   pSysMenu->AppendMenu(MF_SEPARATOR); LmjGU[L,@  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 7X/KQ97  
  } P5oYv  
 } }PxP J$o  
 SetIcon(m_hIcon, TRUE); // Set big icon  t`'5|  
 SetIcon(m_hIcon, FALSE); // Set small icon ^%}PRl9  
 m_Key.SetCurSel(0); RpU.v `  
 RegisterHotkey(); 'b Kc;\  
 CMenu* pMenu=GetSystemMenu(FALSE); .t$1B5  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); *&$2us0%%  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); [*^ rH:  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Sj@VOW  
 return TRUE; // return TRUE unless you set the focus to a control c>L#(D\\  
} v6O5n(5,,  
K# BZ Jcb  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Mby V_A`r_  
{ ]s}9-!{O  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) TQ25"bWi  
 { d%Nx/DS)  
  CAboutDlg dlgAbout; .pPtBqp  
  dlgAbout.DoModal(); 0 1:(QJ  
 } -[ xbGSj{  
 else yIqRSqM  
 { Mb(hdS90  
  CDialog::OnSysCommand(nID, lParam); IS%e5  
 } W>J1JaO  
} `l+9g"q  
w! ':Ws  
void CCaptureDlg::OnPaint() QA# 7T3|  
{ Fz^5cxmw  
 if (IsIconic()) s+&iH  
 { o;'-^ LJ  
  CPaintDC dc(this); // device context for painting m";?B1%x  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);  h3z9}'  
  // Center icon in client rectangle HC(o;,spO  
  int cxIcon = GetSystemMetrics(SM_CXICON); .MW/XnCYs4  
  int cyIcon = GetSystemMetrics(SM_CYICON); xHWD1>  
  CRect rect; P B"nf|pm  
  GetClientRect(&rect); ZG1 {"J/z  
  int x = (rect.Width() - cxIcon + 1) / 2; ;-!O+c  
  int y = (rect.Height() - cyIcon + 1) / 2; |k=5`WG  
  // Draw the icon s^ K:cz  
  dc.DrawIcon(x, y, m_hIcon);  Y$nI9  
 } &|c] U/_w  
 else e4Xo(EY &  
 { a'B 5m]%  
  CDialog::OnPaint(); og8"#%  
 } + wF5(  
} T*zy^we  
'T*h0xX  
HCURSOR CCaptureDlg::OnQueryDragIcon() `g:bvIV5x>  
{ 77~l~EX  
 return (HCURSOR) m_hIcon; <(B: "wI  
}  ){xMMQ5  
*" ,"u;&  
void CCaptureDlg::OnCancel() uG 7ll5Yy  
{ UjH+BC+9`b  
 if(bTray) .*+e?-  
  DeleteIcon(); 6x"|,,&MD0  
  CDialog::OnCancel(); U$T (R2@  
} J_>nn  
E?F?)!%  
void CCaptureDlg::OnAbout() %y R~dt'  
{ zq4)Uab*  
 CAboutDlg dlg; `zMR?F`  
 dlg.DoModal(); t$5)6zG  
} e% .|PZ)  
F+::UWKA  
void CCaptureDlg::OnBrowse() #GA6vJ4^s  
{ ;Ak 6*Sr  
 CString str; H&=3rkX  
 BROWSEINFO bi; _dynqF8*  
 char name[MAX_PATH]; ) GF>]|CG  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Xsv^GmP+  
 bi.hwndOwner=GetSafeHwnd(); pQOT\- bD  
 bi.pszDisplayName=name; +B-;.]L T  
 bi.lpszTitle="Select folder"; ]6TX)1  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; !UW{xHu  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Q^\f,E\S  
 if(idl==NULL) pPt w(5bH  
  return; ICXz(?a  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); IL N0/eH  
 str.ReleaseBuffer(); Q>[GD(8k  
 m_Path=str; h?`'%m?_b  
 if(str.GetAt(str.GetLength()-1)!='\\') 5sK1rDN  
  m_Path+="\\"; ?ZlN$h^  
 UpdateData(FALSE); EJZb3  
} d@,3P)?  
)6,Pmq~)  
void CCaptureDlg::SaveBmp() T^n0=|  
{ NlV,] $L1T  
 CDC dc; GJIM^  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 3rQ;}<*M  
 CBitmap bm; e x`mu E  
 int Width=GetSystemMetrics(SM_CXSCREEN); 5Bog\mS  
 int Height=GetSystemMetrics(SM_CYSCREEN); BA cnFO  
 bm.CreateCompatibleBitmap(&dc,Width,Height); /E0/)@pDq  
 CDC tdc; @I,:(<6  
 tdc.CreateCompatibleDC(&dc); u+/1ryp  
 CBitmap*pOld=tdc.SelectObject(&bm); IL2OVLX  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); z'd*z[L~  
 tdc.SelectObject(pOld); 8WvQ[cd  
 BITMAP btm; ,.T k "\@  
 bm.GetBitmap(&btm); lL{1wCsl  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Y<oDv`a Z0  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); h`:f  
 BITMAPINFOHEADER bih; 3D/<R|p  
 bih.biBitCount=btm.bmBitsPixel; [j^c&}0  
 bih.biClrImportant=0; )>~d`_$dt  
 bih.biClrUsed=0; Da8{==  
 bih.biCompression=0; mbh;oX+  
 bih.biHeight=btm.bmHeight; |g}~7*+i  
 bih.biPlanes=1; js<}>wD7<  
 bih.biSize=sizeof(BITMAPINFOHEADER); 4+j:]poYG{  
 bih.biSizeImage=size; JK@" &  
 bih.biWidth=btm.bmWidth; )RE~=*?d  
 bih.biXPelsPerMeter=0; Gv uX"J  
 bih.biYPelsPerMeter=0; L-v-KO6  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); FY6!)/P0I7  
 static int filecount=0; EM&;SQ;C9  
 CString name; ~56F<=#,  
 name.Format("pict%04d.bmp",filecount++); K!a4>Du{  
 name=m_Path+name; q VcZF7  
 BITMAPFILEHEADER bfh; &z"sT*3  
 bfh.bfReserved1=bfh.bfReserved2=0; ELWm>'Q#9  
 bfh.bfType=((WORD)('M'<< 8)|'B'); gcNpA?mC|u  
 bfh.bfSize=54+size; AJ`R2 $  
 bfh.bfOffBits=54; !O-9W=NJ  
 CFile bf; ttaYtV]]  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ !W ,pjW%Y  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); g9F4nExo  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); NDv_@V(D  
  bf.WriteHuge(lpData,size); _x ;fTW0  
  bf.Close(); )5(Ko <"  
  nCount++; 9q=\_[\[  
 } c6 tB9b  
 GlobalFreePtr(lpData); |f.R]+cH  
 if(nCount==1) }*ZOD1j  
  m_Number.Format("%d picture captured.",nCount); ,{_;q:  
 else -P5M(Rt  
  m_Number.Format("%d pictures captured.",nCount); O%n=n3  
  UpdateData(FALSE); cA8"Ft{P)  
} H LnizE  
(2vf <x  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) lx!9KQAM*  
{ c[xH:$G?Y  
 if(pMsg -> message == WM_KEYDOWN) Ao/KB_4f*Q  
 { aAX(M=3  
  if(pMsg -> wParam == VK_ESCAPE) 9WH  
   return TRUE; )]?"H  
  if(pMsg -> wParam == VK_RETURN) |{8eoF  
   return TRUE; i[wEH1jR  
 } ;.g <u  
 return CDialog::PreTranslateMessage(pMsg); p*^[ ~}N  
} F;&a=R!.  
DY~zi  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) =p lG9  
{ />i~No#Xm  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ xNaDzu"  
  SaveBmp(); ~!Q\\_  
  return FALSE; lN-[2vT<  
} N))G/m3  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ;| :^zo  
 CMenu pop; ayb fBC  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Dm.tYG  
 CMenu*pMenu=pop.GetSubMenu(0); =H\ig%%E@  
 pMenu->SetDefaultItem(ID_EXITICON); =!RlU)w  
 CPoint pt; Apfs&{Uy  
 GetCursorPos(&pt); Qs^Rh F\d  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); <hO|:LX  
 if(id==ID_EXITICON) @4Ox$M  
  DeleteIcon(); n#|pR2  
 else if(id==ID_EXIT) 3;h%mk KQ+  
  OnCancel(); \D]H>i$  
 return FALSE; Rf~? u)h1  
} oq>8  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); xqua>!mqS  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) {{\ d5CkX  
 AddIcon(); pM^r8kIH  
 return res; zeZ}P>C  
} r^$4]@Wn  
dIUg e`O9  
void CCaptureDlg::AddIcon() k7\h- yn{  
{ ^q uv`d  
 NOTIFYICONDATA data; UUF;Q0X  
 data.cbSize=sizeof(NOTIFYICONDATA); iw$n*1M  
 CString tip; ;6?VkF  
 tip.LoadString(IDS_ICONTIP); \R0&*cnmo  
 data.hIcon=GetIcon(0); a_pNFe  
 data.hWnd=GetSafeHwnd(); \2K_"5  
 strcpy(data.szTip,tip); BZP~m=kq  
 data.uCallbackMessage=IDM_SHELL; m'Thm{Y,?n  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; gUcG#  
 data.uID=98; 9? #pqw  
 Shell_NotifyIcon(NIM_ADD,&data); jo-qP4w  
 ShowWindow(SW_HIDE); c-2##Pf_8O  
 bTray=TRUE; Yzr|Z7r q}  
} tw`{\kWG  
`oxs;;P  
void CCaptureDlg::DeleteIcon() BtZycI  
{ 8u401ddg  
 NOTIFYICONDATA data; l9%oKJ;  
 data.cbSize=sizeof(NOTIFYICONDATA); qOV6Kh)  
 data.hWnd=GetSafeHwnd(); pErre2fS  
 data.uID=98; ,MtN_V-  
 Shell_NotifyIcon(NIM_DELETE,&data); {M5[gr%  
 ShowWindow(SW_SHOW); )i;o\UU  
 SetForegroundWindow(); 5Z`9L| 3d  
 ShowWindow(SW_SHOWNORMAL); .mse.$TK.^  
 bTray=FALSE; w<3g1n7R  
} vPV=K+1  
q0oNRAvn"  
void CCaptureDlg::OnChange() 1i.t^PY  
{ <R6$ kom`  
 RegisterHotkey(); 8mCL3F  
} d0`5zd@S  
k lRS:\dW  
BOOL CCaptureDlg::RegisterHotkey() K'`N(WiL  
{ Dt9[uyP&  
 UpdateData(); azj:Hru&t#  
 UCHAR mask=0; jH1!'1s|  
 UCHAR key=0; vq df-i  
 if(m_bControl) X"KX_)GZD  
  mask|=4; o771q}?&`  
 if(m_bAlt) bGl5=`  
  mask|=2; IXmtjRv5  
 if(m_bShift) H'L ~8>  
  mask|=1; 6<h?%j(  
  key=Key_Table[m_Key.GetCurSel()]; v\Y362Xv  
 if(bRegistered){ 6%K,3R-d  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); !;YmLJk;hN  
  bRegistered=FALSE; PLi[T4u  
 } nJ.<yrzi  
 cMask=mask; %CxrXU  
 cKey=key; uKI2KWU?2  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 6QCU:2IiL  
 return bRegistered; BCE} Er&  
} i#@3\&{J>  
v.08,P{b  
  四、小结 Y6|8;2E  
p~T)Af<(  
  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