Re:Preliminary documentation for WindowsCodecs.dll APIs (Post 1 of 2)

Hi Robert,

I am trying to wrap the WIC interfacess, but I m getting error "Access
Violation Error Code :0xc0000005 "

The code is as follows :


IWICImagingFactory imageFactory;
Int32 result;
result = WICCreateImagingFactory_Proxy(0x0236, out imageFactory)
;

IEnumUnknown enumunknown;

result = imageFactory.CreateComponentEnumerator((UInt32)
WICComponentType.WICDecoder,(UInt32) WICComponentEnumerateOptions.
WICComponentEnumerateDefault, out enumunknown);

UInt32 fetched;
IUnknown known;

result = enumunknown.Next(1, out known, out fetched);
IWICBitmapDecoderInfo piDecoderInfo = (IWICBitmapDecoderInfo)
known;

StringBuilder name = null;
UInt32 lenght;
UInt32 len = 200;

result = piDecoderInfo.GetFriendlyName(len, ref name, out lenght)
;



the wrapper for GetFriendlyName function is as follows:
[PreserveSig]
[return: MarshalAs(UnmanagedType.Error)]
Int32 GetFriendlyName(UInt32 cchFriendlyName, ref StringBuilder
wzFriendlyName, out UInt32 pcchActual);


I am getting Access violation error where I have called GetFriendlyName
method.


Please let me know what is the cause of this error.

Thanks,
Vanita