public static IntPtr MarshalManagedToNative(Charset charset, Descriptor descriptor)
{
var xsqlda = new XSQLDA
{
version = descriptor.Version,
sqln = descriptor.Count,
sqld = descriptor.ActualCount
};
var xsqlvar = new XSQLVAR[descriptor.Count];
for (var i = 0; i < xsqlvar.Length; i++)
{
xsqlvar[i] = new XSQLVAR
{
sqltype = descriptor[i].DataType,
sqlscale = descriptor[i].NumericScale,
sqlsubtype = descriptor[i].SubType,
sqllen = descriptor[i].Length
};
if (descriptor[i].HasDataType() && descriptor[i].DbDataType != DbDataType.Null)
{
var buffer = descriptor[i].DbValue.GetBytes();
xsqlvar[i].sqldata = Marshal.AllocHGlobal(buffer.Length);
Marshal.Copy(buffer, 0, xsqlvar[i].sqldata, buffer.Length);
}
else
{
xsqlvar[i].sqldata = Marshal.AllocHGlobal(0);
}
xsqlvar[i].sqlind = Marshal.AllocHGlobal(Marshal.SizeOf <short>());
Marshal.WriteInt16(xsqlvar[i].sqlind, descriptor[i].NullFlag);
xsqlvar[i].sqlname = GetStringBuffer(charset, descriptor[i].Name);
xsqlvar[i].sqlname_length = (short)descriptor[i].Name.Length;
xsqlvar[i].relname = GetStringBuffer(charset, descriptor[i].Relation);
xsqlvar[i].relname_length = (short)descriptor[i].Relation.Length;
xsqlvar[i].ownername = GetStringBuffer(charset, descriptor[i].Owner);
xsqlvar[i].ownername_length = (short)descriptor[i].Owner.Length;
xsqlvar[i].aliasname = GetStringBuffer(charset, descriptor[i].Alias);
xsqlvar[i].aliasname_length = (short)descriptor[i].Alias.Length;
}
return(MarshalManagedToNative(xsqlda, xsqlvar));
}
public static IntPtr MarshalManagedToNative(XSQLDA xsqlda, XSQLVAR[] xsqlvar)
{
var size = ComputeLength(xsqlda.sqln);
var ptr = Marshal.AllocHGlobal(size);
Marshal.StructureToPtr(xsqlda, ptr, true);
for (var i = 0; i < xsqlvar.Length; i++)
{
var offset = ComputeLength(i);
Marshal.StructureToPtr(xsqlvar[i], GetIntPtr(ptr, offset), true);
}
return(ptr);
}
