Hi
You can use the GDAL unescape function like this:
/// <summary>
/// Remove "backslash quotable" escape characters from the string and
convert it to byte array.
/// </summary>
public static byte[] RemoveEscapeCharacters(this string value)
{
if(String.IsNullOrEmpty(value))
{
return new byte[0];
}
int length = value.Length;
IntPtr escapedString = CPLUnescapeString(value, ref length, 0);
byte[] escapedBytes = new byte[length];
Marshal.Copy(escapedString, escapedBytes, 0, length);
VSIFree(escapedString);
return escapedBytes;
}
[DllImport("gdal18.dll", EntryPoint = "CPLUnescapeString",
CallingConvention = CallingConvention.Cdecl)]
private static extern IntPtr CPLUnescapeString(string input, ref int
length, int scheme);
[DllImport("gdal18.dll", EntryPoint = "VSIFree", CallingConvention =
CallingConvention.Cdecl)]
private static extern void VSIFree(IntPtr input);
Yehiyam
From: [email protected]
[mailto:[email protected]] On Behalf Of xavier lhomme
Sent: Wednesday, June 19, 2013 11:50 PM
To: gdal-dev
Subject: [gdal-dev] Extract CGM from a NITF file
Hi
I'm trying to extract CGM files from a NITF but the CGM are corrupt.
First I Unescape the CGM Data and I obtain something like
"\0,\vCreated CGM \"\0 f\0 ÿÿ\0 ...
Then write the text file.
I compared this string with a CGM obtained from NITRO NITF
(nitro_extract_cgm.exe).
The new CGM file start with
"\0,\vCreated CGM \"\0 f\0 ��\0
I succeed to read this CGM file with a CGM viewer.
One of the difference come from caracter like ÿ (from GDAL) � from NITRO
Then It's probably something I missed in the Escaping/Unescaping function
Because UnescapeScring wasn't exposed in C# I wrote a function :
static public string UnescapeString(string pszInput)
{
string pszOutput="";
int iIn = 0;
for (iIn = 0; iIn<pszInput.Length; iIn++)
{
if (pszInput[iIn] == '\\')
{
iIn++;
if (pszInput[iIn] == 'n')
pszOutput += '\n';
else if (pszInput[iIn] == '0')
pszOutput += '\0';
else
pszOutput += pszInput[iIn];
}
else
{
pszOutput += pszInput[iIn];
}
}
return pszOutput;
}
thanks in advance!
Best regards
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