Media Player Classic - HC 源代码分析 5：关于对话框 （CAboutDlg）
前几篇文章分析了Media Player Classic - HC（mpc-hc）的核心类（CMainFrame）：
Media Player Classic - HC 源代码分析 2：核心类 （CMainFrame）（1）
Media Player Classic - HC 源代码分析 3：核心类 （CMainFrame）（2）
Media Player Classic - HC 源代码分析 4：核心类 （CMainFrame）（3）
核心类已经分析的差不多了，现在可以看一看其他类的定义了。可是如此多的类，看看什么好呢？本着由易到难的原则，应该先看看“关于”对话框的代码。“关于”对话框作为mpc-hc系统的一部分，比较有代表性，而且代码相对来说十分简单，因而适合刚入门的人进行学习。
如图所示，“关于”对话框类的定义和实现都在最前面（因为开头是'A'......= =）。类的名字叫做CAboutDlg，定义位于AboutDlg.h，实现位于AboutDlg.cpp。
先看看“关于”对话框是什么样子的吧：
其实相比于其他的“关于”对话框来说，这个还算是一个相对比较复杂的。包含了编译器信息，版本等等信息。
CAboutDlg定义如下所示：
/* * (C) 2012-2013 see Authors.txt * * This file is part of MPC-HC. * * MPC-HC is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 3 of the License, or * (at your option) any later version. * * MPC-HC is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. * */#include "stdafx.h"#include "AboutDlg.h"#include "mpc-hc_config.h"#ifndef MPCHC_LITE#include "FGFilterLAV.h"#endif#include "mplayerc.h"#include "version.h"#include "SysVersion.h"#include "WinAPIUtils.h"/////////////////////////////////////////////////////////////////////////////// CAboutDlg dialog used for App AboutCAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) , m_appname(_T("")) , m_strBuildNumber(_T("")) , m_MPCCompiler(_T(""))#ifndef MPCHC_LITE , m_LAVFiltersVersion(_T(""))#endif{ //{{AFX_DATA_INIT(CAboutDlg) //}}AFX_DATA_INIT}//初始化BOOL CAboutDlg::OnInitDialog(){ // Get the default text before it is overwritten by the call to __super::OnInitDialog() GetDlgItem(IDC_STATIC1)->GetWindowText(m_appname); GetDlgItem(IDC_AUTHORS_LINK)->GetWindowText(m_credits);#ifndef MPCHC_LITE GetDlgItem(IDC_LAVFILTERS_VERSION)->GetWindowText(m_LAVFiltersVersion);#endif __super::OnInitDialog(); // Because we set LR_SHARED, there is no need to explicitly destroy the icon m_icon.SetIcon((HICON)LoadImage(AfxGetInstanceHandle(), MAKEINTRESOURCE(IDR_MAINFRAME), IMAGE_ICON, 48, 48, LR_SHARED));#if MPC_BETA_RELEASE || _WIN64 m_appname += _T(" (");#endif#if MPC_BETA_RELEASE m_appname += MPC_VERSION_BETA;#endif#if MPC_BETA_RELEASE && _WIN64 m_appname += _T(", ");#endif#ifdef _WIN64 m_appname += _T("64-bit");#endif#if MPC_BETA_RELEASE || _WIN64 m_appname += _T(")");#endif#ifdef MPCHC_LITE m_appname += _T(" Lite");#endif // Build the path to Authors.txt m_AuthorsPath = GetProgramPath() + _T("Authors.txt"); // Check if the file exists if (FileExists(m_AuthorsPath)) { // If it does, we make the filename clickable m_credits.Replace(_T("Authors.txt"), _T("<a>Authors.txt</a>")); } m_homepage.Format(_T("<a>%s</a>"), WEBSITE_URL); m_strBuildNumber = MPC_VERSION_STR_FULL;#if defined(__INTEL_COMPILER)#if (__INTEL_COMPILER >= 1210) m_MPCCompiler = _T("ICL ") MAKE_STR(__INTEL_COMPILER) _T(" Build ") MAKE_STR(__INTEL_COMPILER_BUILD_DATE);#else#error Compiler is not supported!#endif#elif defined(_MSC_VER)#if (_MSC_VER == 1700) // 2012#if (_MSC_FULL_VER == 170060610) m_MPCCompiler = _T("MSVC 2012 Update 3");#elif (_MSC_FULL_VER == 170060315) // MSVC 2012 Update 2#error VS2012 Update 2 is not supported because the binaries will not run on XP. Install Update 3 instead.#elif (_MSC_FULL_VER == 170051106) m_MPCCompiler = _T("MSVC 2012 Update 1");#elif (_MSC_FULL_VER < 170050727) // MSVC 2012#error Please install the latest Update for VS2012.#else m_MPCCompiler = _T("MSVC 2012");#endif#elif (_MSC_VER == 1600) // 2010#if (_MSC_FULL_VER >= 160040219) m_MPCCompiler = _T("MSVC 2010 SP1");#else m_MPCCompiler = _T("MSVC 2010");#endif#elif (_MSC_VER < 1600)#error Compiler is not supported!#endif#else#error Please add support for your compiler#endif#if (__AVX__) m_MPCCompiler += _T(" (AVX)");#elif (__SSSE3__) m_MPCCompiler += _T(" (SSSE3)");#elif (__SSE3__) m_MPCCompiler += _T(" (SSE3)");#elif !defined(_M_X64) && defined(_M_IX86_FP)#if (_M_IX86_FP == 2) // /arch:SSE2 was used m_MPCCompiler += _T(" (SSE2)");#elif (_M_IX86_FP == 1) // /arch:SSE was used m_MPCCompiler += _T(" (SSE)");#endif#endif#ifdef _DEBUG m_MPCCompiler += _T(" Debug");#endif#ifndef MPCHC_LITE//版本 CString LAVFiltersVersion = CFGFilterLAV::GetVersion(); if (!LAVFiltersVersion.IsEmpty()) { m_LAVFiltersVersion = LAVFiltersVersion; }#endif m_buildDate = _T(__DATE__) _T(" ") _T(__TIME__); OSVERSIONINFOEX osVersion = SysVersion::GetFullVersion(); m_OSName.Format(_T("Windows NT %1u.%1u (build %u"), osVersion.dwMajorVersion, osVersion.dwMinorVersion, osVersion.dwBuildNumber); if (osVersion.szCSDVersion[0]) { m_OSName.AppendFormat(_T(", %s)"), osVersion.szCSDVersion); } else { m_OSName += _T(")"); } m_OSVersion.Format(_T("%1u.%1u"), osVersion.dwMajorVersion, osVersion.dwMinorVersion); if (SysVersion::Is64Bit()) { m_OSVersion += _T(" (64-bit)"); } UpdateData(FALSE); GetDlgItem(IDOK)->SetFocus(); return FALSE;}void CAboutDlg::DoDataExchange(CDataExchange* pDX){ CDialog::DoDataExchange(pDX); //{{AFX_DATA_MAP(CAboutDlg) //}}AFX_DATA_MAP DDX_Control(pDX, IDR_MAINFRAME, m_icon); DDX_Text(pDX, IDC_STATIC1, m_appname); DDX_Text(pDX, IDC_AUTHORS_LINK, m_credits); DDX_Text(pDX, IDC_HOMEPAGE_LINK, m_homepage); DDX_Text(pDX, IDC_VERSION, m_strBuildNumber); DDX_Text(pDX, IDC_MPC_COMPILER, m_MPCCompiler);#ifndef MPCHC_LITE DDX_Text(pDX, IDC_LAVFILTERS_VERSION, m_LAVFiltersVersion);#endif DDX_Text(pDX, IDC_STATIC2, m_buildDate); DDX_Text(pDX, IDC_STATIC3, m_OSName); DDX_Text(pDX, IDC_STATIC4, m_OSVersion);}BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) //{{AFX_MSG_MAP(CAboutDlg) // No message handlers //}}AFX_MSG_MAP ON_NOTIFY(NM_CLICK, IDC_HOMEPAGE_LINK, OnHomepage) ON_NOTIFY(NM_CLICK, IDC_AUTHORS_LINK, OnAuthors) ON_BN_CLICKED(IDC_BUTTON1, OnCopyToClipboard)END_MESSAGE_MAP()void CAboutDlg::OnHomepage(NMHDR* pNMHDR, LRESULT* pResult){ ShellExecute(m_hWnd, _T("open"), WEBSITE_URL, nullptr, nullptr, SW_SHOWDEFAULT); *pResult = 0;}void CAboutDlg::OnAuthors(NMHDR* pNMHDR, LRESULT* pResult){ ShellExecute(m_hWnd, _T("open"), m_AuthorsPath, nullptr, nullptr, SW_SHOWDEFAULT); *pResult = 0;}//拷贝到剪切板void CAboutDlg::OnCopyToClipboard(){//把各种信息添加到一个字符串中 CStringW info = m_appname; info += _T("\n----------------------------------\n\n"); info += _T("Build information:\n"); info += _T(" Version: ") + m_strBuildNumber + _T("\n"); info += _T(" MPC-HC compiler: ") + m_MPCCompiler + _T("\n"); info += _T(" Build date: ") + m_buildDate + _T("\n\n");#ifndef MPCHC_LITE info += _T("LAV Filters:\n"); info += _T(" LAV Splitter: ") + CFGFilterLAV::GetVersion(CFGFilterLAV::SPLITTER) + _T("\n"); info += _T(" LAV Video: ") + CFGFilterLAV::GetVersion(CFGFilterLAV::VIDEO_DECODER) + _T("\n"); info += _T(" LAV Audio: ") + CFGFilterLAV::GetVersion(CFGFilterLAV::AUDIO_DECODER) + _T("\n\n");#endif info += _T("Operating system:\n"); info += _T(" Name: ") + m_OSName + _T("\n"); info += _T(" Version: ") + m_OSVersion + _T("\n"); COleDataSource* pData = DEBUG_NEW COleDataSource(); int len = info.GetLength() + 1; HGLOBAL hGlob = GlobalAlloc(GMEM_FIXED, len * sizeof(WCHAR)); if (pData && hGlob) { wcscpy_s((WCHAR*)hGlob, len, (LPCWSTR)info); pData->CacheGlobalData(CF_UNICODETEXT, hGlob); // The system will take care of removing the allocated memory pData->SetClipboard(); } else if (pData) { delete pData; } else if (hGlob) { GlobalFree(hGlob); }}代码整体上通俗易懂，调用的都是很常见的函数，不多解释了。