/// <summary>
/// 读取变量的数据
/// </summary>
/// <param name="fileData">文件数据</param>
/// <param name="variableInfo">需要读取的变量信息</param>
/// <returns>变量的数据</returns>
public static T[] GetVariableData <T>(byte[] fileData, MatVariableInfo variableInfo) where T : IComparable
{
if (fileData == null || fileData.Length == 0)
{
return(null);
}
try
{
IntPtr retptr = IntPtr.Zero;
int datasize = 0; //返回的是byte大小
if (CommonMethod.Is64BitVersion())
{
retptr = MATGetVariableData64(fileData, fileData.Length, ref variableInfo, ref datasize);
}
else
{
retptr = MATGetVariableData32(fileData, fileData.Length, ref variableInfo, ref datasize);
}
if (retptr == IntPtr.Zero)
{
return(null);
}
//按照数据类型来拷贝返回数据
int typesize = Marshal.SizeOf(typeof(T));
if ((datasize % typesize) != 0)
{
Marshal.FreeCoTaskMem(retptr);
return(null);
}
datasize = datasize / typesize;
return(CommonMethod.CopyDataArrayFromIntptrAndFree <T>(ref retptr, datasize));
}
catch (Exception ex)
{
ErrorString = ex.Message;
return(null);
}
}
private static extern IntPtr MATGetVariableData64(byte[] fileData, int fileSize, ref MatVariableInfo variableInfo, ref int outDataSize);
