<div dir="ltr"><div><div>Thanks it works well ! I succeed to export graphics from the NITF file.<br></div>But I didn't understand why my C# function was wrong. <br><br><br></div>Best regards.<br></div><div class="gmail_extra">
<br><br><div class="gmail_quote">2013/6/20 Livneh Yehiyam <span dir="ltr"><<a href="mailto:yehil@rafael.co.il" target="_blank">yehil@rafael.co.il</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div link="blue" vlink="purple" lang="EN-US"><table align="center"><tbody><tr><td></td></tr></tbody></table>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Hi<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">You can use the GDAL unescape function like this:<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal" style="text-indent:.5in;text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:gray">///</span><span style="font-size:9.5pt;font-family:Consolas;color:green"> </span><span style="font-size:9.5pt;font-family:Consolas;color:gray"><summary></span><span style="font-size:9.5pt;font-family:Consolas"><u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> <span style="color:gray">///</span><span style="color:green"> Remove "backslash quotable" escape characters
from the string and convert it to byte array.</span><u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> <span style="color:gray">///</span><span style="color:green"> </span><span style="color:gray"></summary></span><u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> <span style="color:blue">public</span> <span style="color:blue">static</span> <span style="color:blue">byte</span>[]
RemoveEscapeCharacters(<span style="color:blue">this</span> <span style="color:blue">string</span> value)<u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> {<u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> <span style="color:blue">if</span>(<span style="color:#2b91af">String</span>.IsNullOrEmpty(value))<u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> {<u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> <span style="color:blue">return</span> <span style="color:blue">new</span> <span style="color:blue">byte</span>[0];<u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> }<u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> <span style="color:blue">int</span> length =
value.Length;<u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> <span style="color:#2b91af">IntPtr</span>
escapedString = CPLUnescapeString(value, <span style="color:blue">ref</span>
length, 0);<u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> <span style="color:blue">byte</span>[]
escapedBytes = <span style="color:blue">new</span> <span style="color:blue">byte</span>[length];<u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> <span style="color:#2b91af">Marshal</span>.Copy(escapedString,
escapedBytes, 0, length);<u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> VSIFree(escapedString);<u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> <span style="color:blue">return</span>
escapedBytes;<u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> }<u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"><u></u> <u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> [<span style="color:#2b91af">DllImport</span>(<span style="color:#a31515">"gdal18.dll"</span>, EntryPoint = <span style="color:#a31515">"CPLUnescapeString"</span>, CallingConvention =
<span style="color:#2b91af">CallingConvention</span>.Cdecl)]<u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> <span style="color:blue">private</span> <span style="color:blue">static</span> <span style="color:blue">extern</span> <span style="color:#2b91af">IntPtr</span> CPLUnescapeString(<span style="color:blue">string</span>
input, <span style="color:blue">ref</span> <span style="color:blue">int</span>
length, <span style="color:blue">int</span> scheme);<u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"><u></u> <u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> [<span style="color:#2b91af">DllImport</span>(<span style="color:#a31515">"gdal18.dll"</span>, EntryPoint = <span style="color:#a31515">"VSIFree"</span>, CallingConvention = <span style="color:#2b91af">CallingConvention</span>.Cdecl)]<u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> <span style="color:blue">private</span> <span style="color:blue">static</span> <span style="color:blue">extern</span> <span style="color:blue">void</span> VSIFree(<span style="color:#2b91af">IntPtr</span>
input);<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Yehiyam<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<table dir="ltr"><tbody><tr><td></td></tr></tbody></table><div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
<a href="mailto:gdal-dev-bounces@lists.osgeo.org" target="_blank">gdal-dev-bounces@lists.osgeo.org</a> [mailto:<a href="mailto:gdal-dev-bounces@lists.osgeo.org" target="_blank">gdal-dev-bounces@lists.osgeo.org</a>] <b>On
Behalf Of </b>xavier lhomme<br>
<b>Sent:</b> Wednesday, June 19, 2013 11:50 PM<br>
<b>To:</b> gdal-dev<br>
<b>Subject:</b> [gdal-dev] Extract CGM from a NITF file<u></u><u></u></span></p>
</div><div><div class="h5">
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Hi </span><u></u><u></u></p>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><u></u> <u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">
I'm trying to extract CGM files from a NITF but the CGM are corrupt. <u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><u></u> <u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">
First I Unescape the CGM Data and I obtain something like<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">
"\0,\vCreated CGM \"\0 f\0 ÿÿ\0 ...<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">
Then write the text file. <u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> <u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">
I compared this string with a CGM obtained from NITRO NITF
(nitro_extract_cgm.exe).<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">
The new CGM file start with <u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">
"\0,\vCreated CGM \"\0 f\0 </span><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">��</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">\0<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> I
succeed to read this CGM file with a CGM viewer. <u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><u></u> <u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">One
of the difference come from caracter like ÿ (from GDAL) </span><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">�</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> from NITRO<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><u></u> <u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Then
It's probably something I missed in the Escaping/Unescaping function <u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><u></u> <u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Because
UnescapeScring wasn't exposed in C# I wrote a function : <u></u><u></u></span></p>
</div>
<div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">static
public string UnescapeString(string pszInput)<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">
{<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">
string pszOutput="";
<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">
int iIn = 0;<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">
for (iIn = 0; iIn<pszInput.Length; iIn++)<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">
{<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">
if (pszInput[iIn] == '\\')<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">
{<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">
iIn++;<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">
if
(pszInput[iIn] == 'n')<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">
pszOutput += '\n';<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">
else if
(pszInput[iIn] == '0')<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">
pszOutput += '\0';<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">
else<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">
pszOutput += pszInput[iIn];<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">
}<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">
else<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">
{<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">
pszOutput +=
pszInput[iIn];<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">
}<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">
}<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">
return pszOutput;<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">
}<u></u><u></u></span></p>
</div>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><u></u> <u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">thanks
in advance!<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Best
regards <u></u><u></u></span></p>
</div>
</div>
</div></div></div>
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</blockquote></div><br></div>