是否将枚举TagLib::ID3v2::AttachedPictureFrame::Type转换为字符串

Convert enum TagLib::ID3v2::AttachedPictureFrame::Type to string?

本文关键字：Type 转换 字符串 AttachedPictureFrame ID3v2 枚举 TagLib 是否      更新时间：2024-05-10

我正在使用c++的taglib。如果我使用以下代码：

ID3v2::AttachedPictureFrame::Type t = picFrame->type();

例如，我得到"；FrontCover(3("；，但我没有找到任何将其转换为字符串以保存值的解决方案。

我还需要一个如何设置ID3v2::AttachedPictureFrame::Type t以将其写入APIC标记的解决方案。

TagLib::ID3v2::AttachedPictureFrame的文档说Type是在该类中定义的枚举：

enum      Type {
Other = 0x00, FileIcon = 0x01, OtherFileIcon = 0x02, FrontCover = 0x03,
BackCover = 0x04, LeafletPage = 0x05, Media = 0x06, LeadArtist = 0x07,
Artist = 0x08, Conductor = 0x09, Band = 0x0A, Composer = 0x0B,
Lyricist = 0x0C, RecordingLocation = 0x0D, DuringRecording = 0x0E, DuringPerformance = 0x0F,
MovieScreenCapture = 0x10, ColouredFish = 0x11, Illustration = 0x12, BandLogo = 0x13,
PublisherLogo = 0x14
}

没有自动转换将enum的符号转换为std::string，反之亦然。另外，正如您所注意到的，TagLib::ID3v2::AttachedPictureFrame类没有提供这样的功能
您需要为此实现助手功能：

std::string attachedPictureFrameType2String(AttachedPictureFrame::Type type) {
switch(type) {
case AttachedPictureFrame::Other: return "Other";
case AttachedPictureFrame::FileIcon: return "FileIcon";
case AttachedPictureFrame::OtherFileIcon: return "OtherFileIcon";
case AttachedPictureFrame::FrontCover: return "FrontCover";
// All the other enum values ...
}
}
AttachedPictureFrame::Type string2AttachedPictureFrameType(const std::string& s) {
if(s == "Other") return AttachedPictureFrame::Other;
if(s == "FileIcon") return AttachedPictureFrame::FileIcon;
if(s == "OtherFileIcon") return AttachedPictureFrame::OtherFileIcon;
if(s == "FrontCover") return AttachedPictureFrame::FrontCover;
// All the other valid string values ...
throw std::exception("Invalid string");
}

正如@Uriya Harpeness在评论中提到的，也可以使用字典来做到这一点，例如：

using std::pair<AttachedPictureFrame::Type,std::string> = TypeDictItem;
using std::vector<TypeDictItem> = TypeDict;
const TypeDict pictureFrameTypeDict = { 
std::make_pair(AttachedPictureFrame::Other,"Other")
, std::make_pair(AttachedPictureFrame::FileIcon,"FileIcon")
, std::make_pair(AttachedPictureFrame::OtherFileIcon,"OtherFileIcon")
, std::make_pair(AttachedPictureFrame::FrontCover,"FrontCover")
// ...
};
std::string attachedPictureFrameType2String(AttachedPictureFrame::Type type) {
auto found = std::find_if(std::begin(pictureFrameTypeDict),
std::end(pictureFrameTypeDict), 
[type](const TypeDictItem& i) { return i.first == type; } );
if(found != pictureFrameTypeDict.end()) {
return (*found).second;
}
throw std::exception("Unexpected enum value.");
}
AttachedPictureFrame::Type string2AttachedPictureFrameType(const std::string s) {
auto found = std::find_if(std::begin(pictureFrameTypeDict),
std::end(pictureFrameTypeDict), 
[s](const TypeDictItem& i) { return i.second == s; } );
if(found != pictureFrameTypeDict.end()) {
return (*found).first;
}
throw std::exception("Invalid string.");
}
相关文章：