How to filter string

Question

1.00/5 (1 vote)

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If I have multiple (16) values in string, how can I get first 4 values? I think I need to parse this string and starting from null, 1, 2, 3, 4, null. please advise if I am correct.

Program Send : string = "00 01 02 03 04 05 05 06 04 04 etc "
i want only starting 4 values in string = "00 01 02 03 04"

What I have tried:

byte[] ScanModeData = new byte[40960];
           int ValidDatalength, i;
           string temp, temps;
           ValidDatalength = 0;

           fCmdRet = StaticClassReaderB.ReadActiveModeData(ScanModeData, ref ValidDatalength, frmcomportindex);
           if (fCmdRet == 0)
           {
               temp = "";
               temps = ByteArrayToHexString(ScanModeData);

               for (i = 0; i < ValidDatalength; i++)
               {
                   temp = temp + temps.Substring(i * 2, 2) + " ";


               }

Posted 4-Mar-17 21:22pm

Yugal Kishor

Updated 4-Mar-17 22:35pm

v2

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Comments

Maciej Los 5-Mar-17 3:28am

You should provide sample string.

Yugal Kishor 5-Mar-17 3:59am

private string ByteArrayToHexString(byte[] data)
{
StringBuilder sb = new StringBuilder(data.Length * 3);
for (int i = 0; i < data.Length; i++)
{
sb.Append(Convert.ToString(data[i], 16).PadLeft(2, '0'));
}
return sb.ToString().ToUpper();
}

Patrice T 5-Mar-17 4:20am

Use Improve question to update your question.
So that everyone can pay attention to this information.

OriginalGriff 5-Mar-17 3:57am

This is not a good question - we cannot work out from that little what you are trying to do.
Remember that we can't see your screen, access your HDD, or read your mind. So give us an example of your input string, and also show us what you expect as an output.
Use the "Improve question" widget to edit your question and provide better information.

Yugal Kishor 5-Mar-17 3:59am

private string ByteArrayToHexString(byte[] data)
{
StringBuilder sb = new StringBuilder(data.Length * 3);
for (int i = 0; i < data.Length; i++)
{
sb.Append(Convert.ToString(data[i], 16).PadLeft(2, '0'));
}
return sb.ToString().ToUpper();
}

OriginalGriff 5-Mar-17 4:07am

That isn't an example: show us the string, not how you build it!

Yugal Kishor 5-Mar-17 4:23am

private void GetData()
{
byte[] ScanModeData = new byte[40960];
int ValidDatalength, i;
string temp, temps;
ValidDatalength = 0;
string y = Convert.ToString(listBox1.SelectedItem);
fCmdRet = StaticClassReaderB.ReadActiveModeData(ScanModeData, ref ValidDatalength, frmcomportindex);
if (fCmdRet == 0)
{
temp = "";
temps = ByteArrayToHexString(ScanModeData);

for (i = 0; i < ValidDatalength; i++)
{
temp = temp + temps.Substring(i * 2, 2) + " ";
}
private string ByteArrayToHexString(byte[] data)
{
StringBuilder sb = new StringBuilder(data.Length * 3);
for (int i = 0; i < data.Length; i++)
{
sb.Append(Convert.ToString(data[i], 16).PadLeft(2, '0'));
}
return sb.ToString().ToUpper();
}

Yugal Kishor 5-Mar-17 4:28am

program pass multipule value . i want to 16 digit value . and another value = null

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Graeme_Grant · Accepted Answer · 2017-03-04T22:21:00

If you have a common marker ("xxx,xxx,xxx" - comma in this example), then use String.Split Method[^].

But without an example, we have no idea what you are asking for.

As OriginalGriff mentioned, try it (rather than get others to do it for you), you might surprise yourself! It is call programming and learning through research - it is how we learned.