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);
}
}
public virtual void Dispose(bool disposing)
{
if (myLibVlcDllHandle != IntPtr.Zero)
{
Win32Interops.FreeLibrary(myLibVlcDllHandle);
myLibVlcDllHandle = IntPtr.Zero;
}
if (myLibVlcCoreDllHandle != IntPtr.Zero)
{
Win32Interops.FreeLibrary(myLibVlcCoreDllHandle);
myLibVlcCoreDllHandle = IntPtr.Zero;
}
if (myLibGccDllHandle != IntPtr.Zero)
{
Win32Interops.FreeLibrary(myLibGccDllHandle);
myLibGccDllHandle = IntPtr.Zero;
}
}
void IDisposable.Dispose()
{
if (myLibVlcDllHandle != IntPtr.Zero)
{
Win32Interops.FreeLibrary(myLibVlcDllHandle);
myLibVlcDllHandle = IntPtr.Zero;
}
if (myLibVlcCoreDllHandle != IntPtr.Zero)
{
Win32Interops.FreeLibrary(myLibVlcCoreDllHandle);
myLibVlcCoreDllHandle = IntPtr.Zero;
}
if (myLibGccDllHandle != IntPtr.Zero)
{
Win32Interops.FreeLibrary(myLibGccDllHandle);
myLibGccDllHandle = IntPtr.Zero;
}
}
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);
}
}
protected VlcInteropsManager(DirectoryInfo dynamicLinkLibrariesPath)
{
if (!dynamicLinkLibrariesPath.Exists)
{
throw new DirectoryNotFoundException();
}
var libGccDllPath = Path.Combine(dynamicLinkLibrariesPath.FullName, "libgcc_s_seh-1.dll");
if (File.Exists(libGccDllPath))
{
myLibGccDllHandle = Win32Interops.LoadLibrary(libGccDllPath);
if (myLibGccDllHandle == IntPtr.Zero)
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
}
var libVlcCoreDllPath = Path.Combine(dynamicLinkLibrariesPath.FullName, "libvlccore.dll");
if (!File.Exists(libVlcCoreDllPath))
{
throw new FileNotFoundException();
}
myLibVlcCoreDllHandle = Win32Interops.LoadLibrary(libVlcCoreDllPath);
if (myLibVlcCoreDllHandle == IntPtr.Zero)
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
var libVlcDllPath = Path.Combine(dynamicLinkLibrariesPath.FullName, "libvlc.dll");
if (!File.Exists(libVlcDllPath))
{
throw new FileNotFoundException();
}
myLibVlcDllHandle = Win32Interops.LoadLibrary(libVlcDllPath);
if (myLibVlcDllHandle == IntPtr.Zero)
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
}
