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dotnet general : Problem reading Chr(0) from random file...
At present I'm facing a strange problem. We are converting a project from VB to .NET One record contains Chr(0). Let the record be of length 1800. In the 50th byte of a record a chr(0) is there. While I use VB to read it's giving all 1800 bytes. But when I converted my VB to VB.NET, after the 49th byte all the bytes are truncating. I have to solve this issue to proceed further. I hope the experts around here can solve my problem. I'm using the random file and using a structure of length 1800 bytes. Following is the code I use Public Structure StudentRCDetails <VBFixedString(1800)> Dim lsData As String End Structure Dim lStructDetails As StudentRCDetails FileOpen(liKeyFileNum, lsFilePath, OpenMode.Binary, , OpenShare.Shared, 1800) FileGet(liKeyFileNum, lStructDetails , Integer.Parse(lsStudentID)) FileClose(liKeyFileNum) I'm getting only a part of a string. ie. till the Chr(0). After, all the datas are discarded. I tried with opening in Random mode also. The result is same for both the cases. Please help me in this issue. It's urgent regards, Venkatarajan
Hai Jon,
I tried to print it out in the debugger?. Let assume the string be "Venkat" & Chr(0) & "rajan". When I tried to print it in the debugger it shows as "Venkat When try to extract character by character, it shows me a error. Not even the terminating quotes. Help me out Regards, Venkatarajan [quoted text, click to view] "Jon Skeet [C# MVP]" wrote:
> Venkatarajan <Venkatarajan@discussions.microsoft.com> wrote: > > At present I'm facing a strange problem. We are converting a project from > > VB to .NET > > One record contains Chr(0). Let the record be of length 1800. In the 50th > > byte of a record a chr(0) is there. > > While I use VB to read it's giving all 1800 bytes. But when I converted my > > VB to VB.NET, after the 49th byte all the bytes are truncating. I have to > > solve this issue to proceed further. I hope the experts around here can solve > > my problem. > > Are you *absolutely sure* that it's actually being truncated? How are > you examining the string? If it's in the debugger, try printing out the > string - you may well find that the rest of the data is there, it's > just not being shown in the debugger. > > (I would be more confident about this if you were using standard .NET > IO classes - I'm not familiar with the VB functions you're using.) > > -- > Jon Skeet - <skeet@pobox.com> > http://www.pobox.com/~skeet > If replying to the group, please do not mail me too
I tried it in Command Window. It gives the same result. Help me to solve this
issue. Regards, Venkatarajan [quoted text, click to view] "Jon Skeet [C# MVP]" wrote:
> Venki <Venki@discussions.microsoft.com> wrote: > > I tried to print it out in the debugger?. Let assume the string be > > "Venkat" & Chr(0) & "rajan". > > When I tried to print it in the debugger it shows as > > "Venkat > > When try to extract character by character, it shows me a error. > > Not even the terminating quotes. > > > > Help me out > > Don't print it out in the debugger - print it out in a console window. > Basically, don't trust the debugger when it comes to strings, until you > know exactly how it handles them. > > -- > Jon Skeet - <skeet@pobox.com> > http://www.pobox.com/~skeet > If replying to the group, please do not mail me too
hai jon,
It's working fine when I tried with Console Application. But when did the same with Web Services or Windows application the string is getting truncated. Please help me in this issue. Dim str1 As String str1 = "Venkat" & Chr(0) & "Rajan" Console.WriteLine(str1) Console.ReadLine() It gave Venkat Rajan in Console Application. Dim str1 As String str1 = "Venkat" & Chr(0) & "Rajan" msgbox(str1) When I used a windows Application , it showed me only Venkat. Thanks in Advance. Regards, Venkatarajan [quoted text, click to view] "Jon Skeet [C# MVP]" wrote:
> Venki <Venki@discussions.microsoft.com> wrote: > > I tried it in Command Window. It gives the same result. Help me to solve this > > issue. > > Don't try it in the command window, try it in the console - using > Console.WriteLine - as I suggested before. > > -- > Jon Skeet - <skeet@pobox.com> > http://www.pobox.com/~skeet > If replying to the group, please do not mail me too
Hai Jon,
See my first post. I'm getting the Structure of length 1800 bytes. When I tried to read it from the file, the character what I'm getting is terminated when it reaches the null string. I have solve this issue. Thanks in advance Regards, Venkatarajan [quoted text, click to view] "Jon Skeet [C# MVP]" wrote:
> Venki <Venki@discussions.microsoft.com> wrote: > > It's working fine when I tried with Console Application. But when did the > > same with Web Services or Windows application the string is getting > > truncated. Please help me in this issue. > > Dim str1 As String > > str1 = "Venkat" & Chr(0) & "Rajan" > > Console.WriteLine(str1) > > Console.ReadLine() > > It gave Venkat Rajan in Console Application. > > > > Dim str1 As String > > str1 = "Venkat" & Chr(0) & "Rajan" > > msgbox(str1) > > When I used a windows Application , it showed me only Venkat. > > Thanks in Advance. > > That's just because message box will truncate strings. The string > itself is fine. > > If you want to get rid of the nul characters, use String.Replace and > replace them with whatever you want (eg space). > > -- > Jon Skeet - <skeet@pobox.com> > http://www.pobox.com/~skeet > If replying to the group, please do not mail me too
[quoted text, click to view]
Venkatarajan <Venkatarajan@discussions.microsoft.com> wrote: > At present I'm facing a strange problem. We are converting a project from > VB to .NET > One record contains Chr(0). Let the record be of length 1800. In the 50th > byte of a record a chr(0) is there. > While I use VB to read it's giving all 1800 bytes. But when I converted my > VB to VB.NET, after the 49th byte all the bytes are truncating. I have to > solve this issue to proceed further. I hope the experts around here can solve > my problem. Are you *absolutely sure* that it's actually being truncated? How are you examining the string? If it's in the debugger, try printing out the string - you may well find that the rest of the data is there, it's just not being shown in the debugger. (I would be more confident about this if you were using standard .NET IO classes - I'm not familiar with the VB functions you're using.) -- Jon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet
[quoted text, click to view]
Venki <Venki@discussions.microsoft.com> wrote: > I tried to print it out in the debugger?. Let assume the string be > "Venkat" & Chr(0) & "rajan". > When I tried to print it in the debugger it shows as > "Venkat > When try to extract character by character, it shows me a error. > Not even the terminating quotes. > > Help me out Don't print it out in the debugger - print it out in a console window. Basically, don't trust the debugger when it comes to strings, until you know exactly how it handles them. -- Jon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet
[quoted text, click to view]
Venki <Venki@discussions.microsoft.com> wrote: > I tried it in Command Window. It gives the same result. Help me to solve this > issue. Don't try it in the command window, try it in the console - using Console.WriteLine - as I suggested before. -- Jon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet
[quoted text, click to view]
Venki <Venki@discussions.microsoft.com> wrote: > It's working fine when I tried with Console Application. But when did the > same with Web Services or Windows application the string is getting > truncated. Please help me in this issue. > Dim str1 As String > str1 = "Venkat" & Chr(0) & "Rajan" > Console.WriteLine(str1) > Console.ReadLine() > It gave Venkat Rajan in Console Application. > > Dim str1 As String > str1 = "Venkat" & Chr(0) & "Rajan" > msgbox(str1) > When I used a windows Application , it showed me only Venkat. > Thanks in Advance. That's just because message box will truncate strings. The string itself is fine. If you want to get rid of the nul characters, use String.Replace and replace them with whatever you want (eg space). -- Jon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet
[quoted text, click to view]
Venki <Venki@discussions.microsoft.com> wrote: > See my first post. I'm getting the Structure of length 1800 bytes. > When I tried to read it from the file, the character what I'm getting > is terminated when it reaches the null string. I have solve this > issue. I'm still not convinced it *is* actually being terminated - have you tried printing out the string *to the console* (not the debugger, not the command window, not a web page, not a message box) after reading it? -- Jon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet
Hai Jon,
As you said I tried to print it in the console. It's displaying correctly. But when tried to do some calculations based on the string, I'm unable to get the whole part of the string. Thanks in advance regards, Venkatarajan [quoted text, click to view] "Jon Skeet [C# MVP]" wrote:
> Venki <Venki@discussions.microsoft.com> wrote: > > See my first post. I'm getting the Structure of length 1800 bytes. > > When I tried to read it from the file, the character what I'm getting > > is terminated when it reaches the null string. I have solve this > > issue. > > I'm still not convinced it *is* actually being terminated - have you > tried printing out the string *to the console* (not the debugger, not > the command window, not a web page, not a message box) after reading > it? > > -- > Jon Skeet - <skeet@pobox.com> > http://www.pobox.com/~skeet > If replying to the group, please do not mail me too
[quoted text, click to view]
Venki <Venki@discussions.microsoft.com> wrote: > As you said I tried to print it in the console. It's displaying > correctly. But when tried to do some calculations based on the string, I'm > unable to get the whole part of the string. You should be able to, just using the standard .NET string access methods. What's failing for you? -- Jon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet
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