Cannot marshal 'return value': Invalid managed/unmanaged type combination.
VS2010-C#引用delphi6下编译的dll文件，读出byte[]报错“Cannot marshal 'return value': Invalid managed/unmanaged type combination.”
delphi6下编译的dll文件 源码如下：

library dataoutdll;
uses
   Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, DB, ADODB, Grids, DBGrids, DBClient, StdCtrls, Provider;

type
   byteBuffer = array[0..1024] of byte;
var
mydataset:tclientdataset;
mydatasource:tdatasource;
myprovider:  tdatasetprovider;
myquery:tadoquery;
sqlcmd:TStringList;

ms1,ms2,ms3:TMemoryStream;
buf: bytebuffer;
{$R *.res}
function getbytes():bytebuffer;stdcall;
begin
ms1:=TMemoryStream.Create;
ms2:=TMemoryStream.Create;
ms3:=TMemoryStream.Create;


mydataset:=tclientdataset.Create(nil);
mydatasource:=tdatasource.Create(nil);
myprovider:=tdatasetprovider.Create(nil);
myquery:=tadoquery.Create(nil);
sqlcmd:=tstringlist.Create;

sqlcmd.Add('select * from trequestprice');
myquery .ConnectionString :=
      'Provider=SQLNCLI.1;Password=qqqqqq;Persist Security Info=True;Us' +
      'er ID=sa;Initial Catalog=HSEms;Data Source=.'   ;
myquery .CursorType := ctStatic  ;
myquery.SQL.AddStrings(sqlcmd) ;
myquery.SQL.Strings [0];
myquery .Active := True;

myprovider.DataSet :=myquery;
mydataset.SetProvider(myprovider)  ;
mydataset.Active := True ;
mydatasource.DataSet := mydataset;

mydataset.SaveToStream(ms3);
ms3.Position :=0;

FillChar(buf,1025,0);
ms3.Read (buf,sizeof(buf));
ms3.Position :=0;
result:=buf;
end;
Exports
getbytes;

begin
end.

代码功能：读取表trequestprice到内存buf中，作为dll的返回值吐出给C#。

VS2010-C#下调用该dll的代码如下：

[DllImport("dataoutdll.dll", EntryPoint = "getbytes", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.StdCall)]
 public static extern byte[] getbytes();

 
 private void button1_Click(object sender, EventArgs e)
        {

            try
            {
                byte[] mybt = new byte[1024];
                mybt = getbytes();//程序执行到这里报错
            }
            catch (Exception ex)
            { MessageBox.Show(ex .Message ); }
      
        
        }

错误提示为：Cannot marshal 'return value': Invalid managed/unmanaged type combination.

请问各位：delphi6编译下的dll中的array[0..1024] of byte 跟C#下的byte[1024],在内存上是等效的吗？

如何解决这个错误？
在线等。
谢谢
[解决办法]
可以确定，数据已经到了buf中，并且没有填满1024.空余为全部填写0；
老是提示托管/非托管 类型不匹配，那谁要跟谁才能匹配呢？


[解决办法]
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