Checks whether a file tag exists.
bool FileTagExists(const QString& qsFileName, int iTagId, const QString& qsTagName);
This method checks whether a file tag with the specified TagId or TagName is attached to the file, directory, or alternate stream specified by FileName. If the specified file tag exists, this method returns true; otherwise it returns false.
The value passed for FileName must be a vault-local absolute path.
To check for a raw file tag, pass its Id for TagId and pass empty string for TagName. To check for a typed file tag, pass its name for TagName and pass 0 for TagId. If values are provided for both TagId and TagName, this method fails with an error.
Please refer to the File Tags topic for more information.
Note: This method can only be called when Active is true.
This method returns a Boolean value; after it returns, call the GetLastErrorCode() method to obtain its result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the GetLastError() method can be called to retrieve the associated error message.