使用W3BTRV7.DLL在c＃代碼中的BUFF

Question

我正在尋找一個簡短的示例，直接訪問使用W3BTRV7.DLL在c＃代碼中的BTrieve 6.15文件。

感謝您的任何sugestions

Answer 1

這裏的樣本：

[System.Runtime.InteropServices.DllImport("WBTRV32.dll", CharSet = System.Runtime.InteropServices.CharSet.Ansi)] 
    static extern short BTRCALL(ushort operation, 
    [System.Runtime.InteropServices.MarshalAs (System.Runtime.InteropServices.UnmanagedType.LPArray, SizeConst = 128)] byte[] posBlk, 
    [System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.Struct, SizeConst = 255)] 
    ref RecordBuffer databuffer, 
    ref int dataLength, 
    [System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.LPArray, SizeConst = 255)] char[] keyBffer, 
    ushort keyLength, ushort keyNum); 

[System.Runtime.InteropServices.StructLayout(System.Runtime.InteropServices.LayoutKind.Sequential, Pack = 1, CharSet = System.Runtime.InteropServices.CharSet.Ansi)] 
    public struct RecordBuffer 
    { 
     public short docType; 
     [System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.ByValArray, SizeConst = 2500)] 
     public char[] docDescPlural; 
     public short sorting; 
     [System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.ByValArray, SizeConst = 2500)] 
     public char[] docDescSingle; 
     public short copyOtherThanSrc; 
     public double defaultNotebookNo; 
    } 

private void PopulateAllRecords(string fileName) 
    { 
     byte[] positionBlock = new byte[128]; 
     char[] fileNameArray = fileName.ToCharArray(); 

     // Open file 
     RecordBuffer dataBuffer = new RecordBuffer(); 
     int bufferLength = System.Runtime.InteropServices.Marshal.SizeOf(dataBuffer); 
     short status = (short)BTRCALL((ushort)OPCODE.BOPEN, positionBlock, ref dataBuffer, ref bufferLength, fileNameArray, 0, 0); 

     if (status == 0) 
     { 
     ..... 
     } 
    }