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MediaInfo源代码分析系列文章列表：
MediaInfo源代码分析 1：整体结构MediaInfo源代码分析 2：API函数
MediaInfo源代码分析 3：Open()函数
MediaInfo源代码分析 4：Inform()函数
MediaInfo源代码分析 5：JPEG解析代码分析
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我们来看一下MediaInfo中的Inform()函数的内部调用过程
首先Inform()函数封装了MediaInfo_Internal类中的Inform()函数
//返回文件信息String MediaInfo::Inform(size_t)
{
//封装了一层
return Internal->Inform();
}
查看一下MediaInfo_Internal类中的Inform()函数的源代码：
// 获取信息Ztring MediaInfo_Internal::Inform(){ CS.Enter(); if (Info && Info->Status[File__Analyze::IsUpdated]) Info->Open_Buffer_Update(); CS.Leave(); if (MediaInfoLib::Config.Inform_Get()==__T("MPEG-7")) return Export_Mpeg7().Transform(*this); if (MediaInfoLib::Config.Inform_Get()==__T("PBCore") || MediaInfoLib::Config.Inform_Get()==__T("PBCore_1.2")) return Export_PBCore().Transform(*this); if (MediaInfoLib::Config.Inform_Get()==__T("reVTMD")) return __T("reVTMD is disabled due to its non-free licensing."); //return Export_reVTMD().Transform(*this);//获取相应的信息 if (!( MediaInfoLib::Config.Inform_Get(__T("General")).empty() && MediaInfoLib::Config.Inform_Get(__T("Video")).empty() && MediaInfoLib::Config.Inform_Get(__T("Audio")).empty() && MediaInfoLib::Config.Inform_Get(__T("Text")).empty() && MediaInfoLib::Config.Inform_Get(__T("Chapters")).empty() && MediaInfoLib::Config.Inform_Get(__T("Image")).empty() && MediaInfoLib::Config.Inform_Get(__T("Menu")).empty() )) {//获取各种信息//Retour即为返回的字符串 Ztring Retour; Retour+=MediaInfoLib::Config.Inform_Get(__T("File_Begin")); Retour+=MediaInfoLib::Config.Inform_Get(__T("General_Begin")); Retour+=Inform(Stream_General, 0, false); Retour+=MediaInfoLib::Config.Inform_Get(__T("General_End")); if (Count_Get(Stream_Video)) Retour+=MediaInfoLib::Config.Inform_Get(__T("Video_Begin")); for (size_t I1=0; I1<Count_Get(Stream_Video); I1++) { Retour+=Inform(Stream_Video, I1, false); if (I1!=Count_Get(Stream_Video)-1) Retour+=MediaInfoLib::Config.Inform_Get(__T("Video_Middle")); } if (Count_Get(Stream_Video)) Retour+=MediaInfoLib::Config.Inform_Get(__T("Video_End")); if (Count_Get(Stream_Audio)) Retour+=MediaInfoLib::Config.Inform_Get(__T("Audio_Begin")); for (size_t I1=0; I1<Count_Get(Stream_Audio); I1++) { Retour+=Inform(Stream_Audio, I1, false); if (I1!=Count_Get(Stream_Audio)-1) Retour+=MediaInfoLib::Config.Inform_Get(__T("Audio_Middle")); } if (Count_Get(Stream_Audio)) Retour+=MediaInfoLib::Config.Inform_Get(__T("Audio_End")); if (Count_Get(Stream_Text)) Retour+=MediaInfoLib::Config.Inform_Get(__T("Text_Begin")); for (size_t I1=0; I1<Count_Get(Stream_Text); I1++) { Retour+=Inform(Stream_Text, I1, false); if (I1!=Count_Get(Stream_Text)-1) Retour+=MediaInfoLib::Config.Inform_Get(__T("Text_Middle")); } if (Count_Get(Stream_Text)) Retour+=MediaInfoLib::Config.Inform_Get(__T("Text_End")); if (Count_Get(Stream_Other)) Retour+=MediaInfoLib::Config.Inform_Get(__T("Chapters_Begin")); for (size_t I1=0; I1<Count_Get(Stream_Other); I1++) { Retour+=Inform(Stream_Other, I1, false); if (I1!=Count_Get(Stream_Other)-1) Retour+=MediaInfoLib::Config.Inform_Get(__T("Chapters_Middle")); } if (Count_Get(Stream_Other)) Retour+=MediaInfoLib::Config.Inform_Get(__T("Chapters_End")); if (Count_Get(Stream_Image)) Retour+=MediaInfoLib::Config.Inform_Get(__T("Image_Begin")); for (size_t I1=0; I1<Count_Get(Stream_Image); I1++) { Retour+=Inform(Stream_Image, I1, false); if (I1!=Count_Get(Stream_Image)-1) Retour+=MediaInfoLib::Config.Inform_Get(__T("Image_Middle")); } if (Count_Get(Stream_Image)) Retour+=MediaInfoLib::Config.Inform_Get(__T("Image_End")); if (Count_Get(Stream_Menu)) Retour+=MediaInfoLib::Config.Inform_Get(__T("Menu_Begin")); for (size_t I1=0; I1<Count_Get(Stream_Menu); I1++) { Retour+=Inform(Stream_Menu, I1, false); if (I1!=Count_Get(Stream_Menu)-1) Retour+=MediaInfoLib::Config.Inform_Get(__T("Menu_Middle")); } if (Count_Get(Stream_Menu)) Retour+=MediaInfoLib::Config.Inform_Get(__T("Menu_End")); Retour+=MediaInfoLib::Config.Inform_Get(__T("File_End"));//可以在此加入视频质量检测-----------------------------------------//字符串替换？各种换行符统统改为“\n”----------------------------- Retour.FindAndReplace(__T("\\r\\n"), __T("\n"), 0, Ztring_Recursive); Retour.FindAndReplace(__T("\\r"), __T("\n"), 0, Ztring_Recursive); Retour.FindAndReplace(__T("\\n"), __T("\n"), 0, Ztring_Recursive); Retour.FindAndReplace(__T("\r\n"), __T("\n"), 0, Ztring_Recursive); Retour.FindAndReplace(__T("\r"), __T("\n"), 0, Ztring_Recursive); Retour.FindAndReplace(__T("\n"), MediaInfoLib::Config.LineSeparator_Get(), 0, Ztring_Recursive); //Special characters Retour.FindAndReplace(__T("|SC1|"), __T("\\"), 0, Ztring_Recursive); Retour.FindAndReplace(__T("|SC2|"), __T("["), 0, Ztring_Recursive); Retour.FindAndReplace(__T("|SC3|"), __T("]"), 0, Ztring_Recursive); Retour.FindAndReplace(__T("|SC4|"), __T(","), 0, Ztring_Recursive); Retour.FindAndReplace(__T("|SC5|"), __T(";"), 0, Ztring_Recursive); Retour.FindAndReplace(__T("|SC6|"), __T("("), 0, Ztring_Recursive); Retour.FindAndReplace(__T("|SC7|"), __T(")"), 0, Ztring_Recursive); Retour.FindAndReplace(__T("|SC8|"), __T(")"), 0, Ztring_Recursive); Retour.FindAndReplace(__T("|SC9|"), __T("),"), 0, Ztring_Recursive); return Retour; } //Informations Ztring Retour; bool HTML=false; bool XML=false; bool CSV=false;//获取配置信息（输出格式） if (MediaInfoLib::Config.Inform_Get()==__T("HTML")) HTML=true; if (MediaInfoLib::Config.Inform_Get()==__T("XML")) XML=true; if (MediaInfoLib::Config.Inform_Get()==__T("CSV")) CSV=true; if (HTML) Retour+=__T("<html>\n\n<head>\n<META http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\" /></head>\n<body>\n"); if (XML) Retour+=__T("<File>\n"); for (size_t StreamKind=(size_t)Stream_General; StreamKind<Stream_Max; StreamKind++) { //Pour chaque type de flux for (size_t StreamPos=0; StreamPos<(size_t)Count_Get((stream_t)StreamKind); StreamPos++) { //Pour chaque stream//输出为HTML if (HTML) Retour+=__T("<table width=\"100%\" border=\"0\" cellpadding=\"1\" cellspacing=\"2\" style=\"border:1px solid Navy\">\n<tr>\n <td width=\"150\"><h2>"); //输出为XMLif (XML) Retour+=__T("<track type=\""); Ztring A=Get((stream_t)StreamKind, StreamPos, __T("StreamKind/String")); Ztring B=Get((stream_t)StreamKind, StreamPos, __T("StreamKindPos")); if (!XML && !B.empty()) { if (CSV) A+=__T(","); else A+=MediaInfoLib::Config.Language_Get(__T(" Config_Text_NumberTag")); A+=B; } Retour+=A; if (XML) { Retour+=__T("\""); if (!B.empty()) { Retour+=__T(" streamid=\""); Retour+=B; Retour+=__T("\""); } }//输出为HTML if (HTML) Retour+=__T("</h2></td>\n </tr>");//输出为XML if (XML) Retour+=__T(">"); Retour+=MediaInfoLib::Config.LineSeparator_Get(); Retour+=Inform((stream_t)StreamKind, StreamPos, false); Retour.FindAndReplace(__T("\\"), __T("|SC1|"), 0, Ztring_Recursive); if (HTML) Retour+=__T("</table>\n<br />"); if (XML) Retour+=__T("</track>\n"); Retour+=MediaInfoLib::Config.LineSeparator_Get(); } }//输出为HTML if (HTML) Retour+=__T("\n</body>\n</html>\n");//输出为XML if (XML) Retour+=__T("</File>\n");//字符串替换？ Retour.FindAndReplace(__T("\\r\\n"), __T("\n"), 0, Ztring_Recursive); Retour.FindAndReplace(__T("\\r"), __T("\n"), 0, Ztring_Recursive); Retour.FindAndReplace(__T("\\n"), __T("\n"), 0, Ztring_Recursive); Retour.FindAndReplace(__T("\r\n"), __T("\n"), 0, Ztring_Recursive); Retour.FindAndReplace(__T("\r"), __T("\n"), 0, Ztring_Recursive); Retour.FindAndReplace(__T("\n"), MediaInfoLib::Config.LineSeparator_Get(), 0, Ztring_Recursive); //Special characters Retour.FindAndReplace(__T("|SC1|"), __T("\\"), 0, Ztring_Recursive); Retour.FindAndReplace(__T("|SC2|"), __T("["), 0, Ztring_Recursive); Retour.FindAndReplace(__T("|SC3|"), __T("]"), 0, Ztring_Recursive); Retour.FindAndReplace(__T("|SC4|"), __T(","), 0, Ztring_Recursive); Retour.FindAndReplace(__T("|SC5|"), __T(";"), 0, Ztring_Recursive); Retour.FindAndReplace(__T("|SC6|"), __T("("), 0, Ztring_Recursive); Retour.FindAndReplace(__T("|SC7|"), __T(")"), 0, Ztring_Recursive); Retour.FindAndReplace(__T("|SC8|"), __T(")"), 0, Ztring_Recursive); Retour.FindAndReplace(__T("|SC9|"), __T("),"), 0, Ztring_Recursive); return Retour;}
函数比较复杂，从代码中我们可以看出，Inform()的实质还是使用Get()一个一个取出所有的属性值。
当指定输出为XML或者是HTML的时候，在输出的字符串上加上相应的标签（例如，输出为HTML的时候，字符串每一行上加上“</tr><tr>”，首尾加上“<table></table>”）
具体每一块代码的含义已经写在注释中了。