Also I'm not sure why you're using a double* in Chararray. It should be a char*
and is only used as a replacement for string. This is what I use:
/// <summary>
/// Chararray is a helper struct to marshal the strings into/out of
unmanaged HDF.
/// </summary>
[StructLayout(LayoutKind.Sequential)]
public unsafe struct Chararray
{
/// <summary>
/// internal C-string pointer.
/// </summary>
[System.Runtime.InteropServices.MarshalAs(UnmanagedType.LPStr)]
private char* mText;
/// <summary>
/// Creator to Load text value
/// </summary>
/// <param name="text">string to load</param>
public Chararray(string text)
{
// Duplicate 'Load' functionality
IntPtr ipp =
System.Runtime.InteropServices.Marshal.StringToHGlobalAnsi(text);
this.mText = (char*)ipp;
}
/// <summary>
/// an initializer to get and set the char* since it is unsafe
/// </summary>
public char* Text
{
get
{
return mText;
}
}
/// <summary>
/// free the text entered with Load
/// </summary>
public void Cleanup()
{
if (mText != null)
{
System.Runtime.InteropServices.Marshal.FreeHGlobal((IntPtr)mText);
mText = null;
}
}
/// <summary>
/// Override of ToString to get a .NET string from C.
/// </summary>
/// <returns>a .NET string</returns>
public override string ToString()
{
string s;
//the HDF5 STRING is not a string but in fact a char *
//since it is we need to translate the return into a pointer
address
IntPtr ipp = (IntPtr)this.Text;
//This call is used to transform the pointer into the value of
the pointer.
//NOTE: this only works with null-terminated strings.
s = System.Runtime.InteropServices.Marshal.PtrToStringAnsi(ipp);
return s;
}
} // Chararray
Scott
> -----Original Message-----
> From: Hdf-forum [mailto:hdf-forum-boun...@hdfgroup.org] On Behalf Of
> Insane
> Sent: Tuesday, April 09, 2013 3:58 PM
> To: hdf-forum@hdfgroup.org
> Subject: Re: [Hdf-forum] c# read different datatypes
>
> Maybe, I am misunderstanding smth.
> I used this code
> [StructLayout(LayoutKind.Sequential)]
> public unsafe struct Chararray
> {
> private double* recordedText;
>
> //an initializer to get and set the char* since it is
> unsafe
> public double* RecordedText
> {
> get
> {
> return recordedText;
> }
> set
> {
> recordedText = value;
> }
> }
>
> public override string ToString()
> {
> string s = "";
> //the HDF5 STRING is not a string but in fact a char *
> //since it is we need to translate the return into a
> pointeraddress
>
> IntPtr ipp = (IntPtr)this.recordedText;
> //This call is used to transform the pointer into the
> valueof the pointer.
>
> //NOTE: this only works with null-terminated strings.
> s
> =System.Runtime.InteropServices.Marshal.PtrToStringAnsi(ipp);
>
> return s;
> }
> }
> -------------
> and added <CharArray> instead of <char>
>
> now the returning value of "CharArray" (is "0x000007ce " double*)
>
>
>
>
>
> --
> View this message in context: http://hdf-forum.184993.n3.nabble.com/c-
> read-different-datatypes-tp4026057p4026061.html
> Sent from the hdf-forum mailing list archive at Nabble.com.
>
> _______________________________________________
> Hdf-forum is for HDF software users discussion.
> Hdf-forum@hdfgroup.org
> http://mail.hdfgroup.org/mailman/listinfo/hdf-forum_hdfgroup.org
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