internal T GetInteropDelegate <T>()
{
string vlcFunctionName = null;
try
{
var attrs = typeof(T).GetCustomAttributes(typeof(LibVlcFunctionAttribute), false);
if (attrs.Length == 0)
{
throw new Exception("Could not find the LibVlcFunctionAttribute.");
}
var attr = (LibVlcFunctionAttribute)attrs[0];
vlcFunctionName = attr.FunctionName;
if (myInteropDelegates.ContainsKey(vlcFunctionName))
{
return((T)Convert.ChangeType(myInteropDelegates[attr.FunctionName], typeof(T), null));
}
var procAddress = Win32Interops.GetProcAddress(myLibVlcDllHandle, attr.FunctionName);
if (procAddress == IntPtr.Zero)
{
throw new Win32Exception();
}
var delegateForFunctionPointer = Marshal.GetDelegateForFunctionPointer(procAddress, typeof(T));
myInteropDelegates[attr.FunctionName] = delegateForFunctionPointer;
return((T)Convert.ChangeType(delegateForFunctionPointer, typeof(T), null));
}
catch (Win32Exception e)
{
throw new MissingMethodException(string.Format("The address of the function '{0}' does not exist in libvlc library.", vlcFunctionName), e);
}
}
internal T GetInteropDelegate <T>()
{
string vlcFunctionName = null;
try
{
#if NETSTANDARD1_3
var attrs = typeof(T).GetTypeInfo().GetCustomAttributes(typeof(LibVlcFunctionAttribute), false).ToArray();
#else
var attrs = typeof(T).GetCustomAttributes(typeof(LibVlcFunctionAttribute), false);
#endif
if (attrs.Length == 0)
{
throw new Exception("Could not find the LibVlcFunctionAttribute.");
}
var attr = (LibVlcFunctionAttribute)attrs[0];
vlcFunctionName = attr.FunctionName;
lock (this._myInteropDelegatesLockObject)
{
if (myInteropDelegates.ContainsKey(vlcFunctionName))
{
return((T)myInteropDelegates[attr.FunctionName]);
}
var procAddress = Win32Interops.GetProcAddress(myLibVlcDllHandle, attr.FunctionName);
if (procAddress == IntPtr.Zero)
{
throw new Win32Exception();
}
var delegateForFunctionPointer = MarshalHelper.GetDelegateForFunctionPointer <T>(procAddress);
myInteropDelegates[attr.FunctionName] = delegateForFunctionPointer;
return(delegateForFunctionPointer);
}
}
catch (Win32Exception e)
{
throw new MissingMethodException(string.Format("The address of the function '{0}' does not exist in libvlc library.", vlcFunctionName), e);
}
}