public unsafe static ITypeInfo GetTypeInfoByName(this ITypeLib typeLib, string typeName)
{
// The find method is case insensitive, and will overwrite the input buffer
// with the actual found casing.
char * nameBuffer = stackalloc char[typeName.Length + 1];
Span <char> nameSpan = new Span <char>(nameBuffer, typeName.Length);
typeName.AsSpan().CopyTo(nameSpan);
nameBuffer[typeName.Length] = '\0';
IntPtr * typeInfos = stackalloc IntPtr[1];
MemberId *memberIds = stackalloc MemberId[1];
ushort found = 1;
typeLib.FindName(
nameBuffer,
lHashVal: 0,
typeInfos,
memberIds,
&found).ThrowIfFailed(typeName);
return((ITypeInfo)Marshal.GetTypedObjectForIUnknown(typeInfos[0], typeof(ITypeInfo)));
}
public unsafe void FindName()
{
HResult result = LoadStdOle2(out ITypeLib typeLib);
result.Should().Be(HResult.S_OK);
typeLib.Should().NotBeNull();
string name = "picture";
char * nameBuffer = stackalloc char[name.Length + 1];
Span <char> nameSpan = new Span <char>(nameBuffer, name.Length);
name.AsSpan().CopyTo(nameSpan);
nameBuffer[name.Length] = '\0';
IntPtr * typeInfos = stackalloc IntPtr[1];
MemberId *memberIds = stackalloc MemberId[1];
ushort found = 1;
result = typeLib.FindName(
nameBuffer,
lHashVal: 0,
typeInfos,
memberIds,
&found);
result.Should().Be(HResult.S_OK);
found.Should().Be(1);
memberIds[0].Should().Be(new MemberId {
Value = -1
});
typeInfos[0].Should().NotBe(IntPtr.Zero);
Marshal.Release(typeInfos[0]);
// Find gives back the right casing
nameSpan.ToString().Should().Be("Picture");
}
