/// <summary>
/// Inits XmpReader from media file.
/// </summary>
/// <exception cref="ArgumentNullException">File path provided is invalid: null or empty.</exception>
/// <exception cref="InvalidOperationException">Initialization of handles failed in DLL.</exception>
public static XmpReader InitFromMediaFile(string filePath)
{
if (string.IsNullOrWhiteSpace(filePath))
{
throw new ArgumentNullException("filePath");
}
XmpReader instance = new XmpReader();
string errorMsg = string.Empty;
try {
instance._xmpMetaHandle = GetMeta(filePath);
}
catch (Exception) {
errorMsg = string.Format("Could not initialize XmpMeta from DLL for file {0}!", filePath);
throw new InvalidOperationException(errorMsg);
}
if (instance._xmpMetaHandle == IntPtr.Zero)
{
errorMsg = string.Format("_xmpMetaHandle is <null> for file {0}!", filePath);
throw new InvalidOperationException(errorMsg);
}
try {
instance._xmpIteratorHandle = GetIterator(instance._xmpMetaHandle);
}
catch (Exception) {
errorMsg = string.Format("Could not initialize XmpIterator from DLL for file {0}!", filePath);
instance.Cleanup();
throw new InvalidOperationException(errorMsg);
}
if (instance._xmpIteratorHandle == IntPtr.Zero)
{
errorMsg = string.Format("_xmpIteratorHandle is <null> for file {0}!", filePath);
instance.Cleanup();
throw new InvalidOperationException(errorMsg);
}
return(instance);
}
/// <summary>
/// Inits XmpReader from xml string.
/// </summary>
/// <exception cref="ArgumentNullException">XML string provided is invalid: null or empty.</exception>
/// <exception cref="InvalidOperationException">Initialization of handles failed in DLL.</exception>
public static XmpReader InitFromXml(string xml)
{
if (string.IsNullOrWhiteSpace(xml))
{
throw new ArgumentNullException("xml");
}
XmpReader instance = new XmpReader();
string errorMsg = string.Empty;
try {
instance._xmpMetaHandle = GetMetaFromXml(xml);
}
catch (Exception) {
errorMsg = "Could not initialize XmpMeta from XML!";
throw new InvalidOperationException(errorMsg);
}
if (instance._xmpMetaHandle == IntPtr.Zero)
{
errorMsg = "_xmpMetaHandle is <null> for XML!";
throw new InvalidOperationException(errorMsg);
}
try {
instance._xmpIteratorHandle = GetIterator(instance._xmpMetaHandle);
}
catch (Exception) {
errorMsg = "Could not initialize XmpIterator from DLL XML!";
instance.Cleanup();
throw new InvalidOperationException(errorMsg);
}
if (instance._xmpIteratorHandle == IntPtr.Zero)
{
errorMsg = "_xmpIteratorHandle is <null> for XML!";
instance.Cleanup();
throw new InvalidOperationException(errorMsg);
}
return(instance);
}