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// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
namespace WixToolset.Core.Native.Msi
{
using System;
using System.ComponentModel;
using System.Text;
/// <summary>
/// Wrapper class around msi.dll interop for a record.
/// </summary>
public sealed class Record : MsiHandle
{
/// <summary>
/// Creates a record with the specified number of fields.
/// </summary>
/// <param name="fieldCount">Number of fields in record.</param>
public Record(int fieldCount)
{
this.Handle = MsiInterop.MsiCreateRecord(fieldCount);
if (0 == this.Handle)
{
throw new OutOfMemoryException();
}
}
/// <summary>
/// Creates a record from a handle.
/// </summary>
/// <param name="handle">Handle to create record from.</param>
internal Record(uint handle)
{
this.Handle = handle;
}
/// <summary>
/// Gets a string value at specified location.
/// </summary>
/// <param name="field">Index into record to get string.</param>
public string this[int field]
{
get => this.GetString(field);
set => this.SetString(field, value);
}
/// <summary>
/// Determines if the value is null at the specified location.
/// </summary>
/// <param name="field">Index into record of the field to query.</param>
/// <returns>true if the value is null, false otherwise.</returns>
public bool IsNull(int field)
{
var error = MsiInterop.MsiRecordIsNull(this.Handle, field);
switch (error)
{
case 0:
return false;
case 1:
return true;
default:
throw new Win32Exception(error);
}
}
/// <summary>
/// Gets integer value at specified location.
/// </summary>
/// <param name="field">Index into record to get integer</param>
/// <returns>Integer value</returns>
public int GetInteger(int field)
{
return MsiInterop.MsiRecordGetInteger(this.Handle, field);
}
/// <summary>
/// Sets integer value at specified location.
/// </summary>
/// <param name="field">Index into record to set integer.</param>
/// <param name="value">Value to set into record.</param>
public void SetInteger(int field, int value)
{
var error = MsiInterop.MsiRecordSetInteger(this.Handle, field, value);
if (0 != error)
{
throw new Win32Exception(error);
}
}
/// <summary>
/// Gets string value at specified location.
/// </summary>
/// <param name="field">Index into record to get string.</param>
/// <returns>String value</returns>
public string GetString(int field)
{
var bufferSize = 256;
var buffer = new StringBuilder(bufferSize);
var error = MsiInterop.MsiRecordGetString(this.Handle, field, buffer, ref bufferSize);
if (234 == error)
{
buffer.EnsureCapacity(++bufferSize);
error = MsiInterop.MsiRecordGetString(this.Handle, field, buffer, ref bufferSize);
}
if (0 != error)
{
throw new Win32Exception(error);
}
return (0 < buffer.Length ? buffer.ToString() : null);
}
/// <summary>
/// Set string value at specified location
/// </summary>
/// <param name="field">Index into record to set string.</param>
/// <param name="value">Value to set into record</param>
public void SetString(int field, string value)
{
var error = MsiInterop.MsiRecordSetString(this.Handle, field, value);
if (0 != error)
{
throw new Win32Exception(error);
}
}
/// <summary>
/// Get stream at specified location.
/// </summary>
/// <param name="field">Index into record to get stream.</param>
/// <param name="buffer">buffer to receive bytes from stream.</param>
/// <param name="requestedBufferSize">Buffer size to read.</param>
/// <returns>Stream read into string.</returns>
public int GetStream(int field, byte[] buffer, int requestedBufferSize)
{
var bufferSize = buffer.Length;
if (requestedBufferSize > 0)
{
bufferSize = requestedBufferSize;
}
var error = MsiInterop.MsiRecordReadStream(this.Handle, field, buffer, ref bufferSize);
if (0 != error)
{
throw new Win32Exception(error);
}
return bufferSize;
}
/// <summary>
/// Sets a stream at a specified location.
/// </summary>
/// <param name="field">Index into record to set stream.</param>
/// <param name="path">Path to file to read into stream.</param>
public void SetStream(int field, string path)
{
var error = MsiInterop.MsiRecordSetStream(this.Handle, field, path);
if (0 != error)
{
throw new Win32Exception(error);
}
}
/// <summary>
/// Gets the number of fields in record.
/// </summary>
/// <returns>Count of fields in record.</returns>
public int GetFieldCount()
{
var size = MsiInterop.MsiRecordGetFieldCount(this.Handle);
if (0 > size)
{
throw new Win32Exception();
}
return size;
}
}
}
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