C# - C++ function call with C#

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Author

C++ function call with C#

AlMan42

2005-12-12, 9:12 am

Newbie question.

I'm trying to call the following function defined in a .dll

BOOL OfflineSDK_IsMediaAvailable(BOOL* pbMediaReady)

I've set up the [DLLImport] stuff and it works fine for other methods I'm calling in the DLL. I try to call the function but am getting System.NullReferenceException: Object reference not set to an instance of an object.

[DllImport("OffLineSDK.dll", CharSet=CharSet.Auto, EntryPoint="? OffLineSDK_IsMediaAvailable@@YAHU_DEVICE
@@PAH@Z")]
private static extern bool ProDVD_OffLineSDK_IsMediaAvailable(ref bool available);

Code in calling method....
{
bool available = new bool();
OfflineSDK_IsMediaAvailable(ref available);
}

Any ideas?

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