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How can I read a string from a database field byte by byte? the DataReader class has two methods that seem useful: ReadBytes and ReadChars. The problem is that the former method can't be applied to a field of type string and the latter one reads the string char by char, not byte by byte. It also seems that the default encoding used by ReadChars method is unicode.
Notice that I don't want to read the bytes from a filled dataset, because after filling the dataset by a DataAdapter, there is a change made to the string that've been read.
Please help!
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I think that what is happening is that the bytes are being altered because they are being stored in different ways to how .NET wants a string. If you really need the bytes then you are going to have to store the bytes in the first place.
My: Blog | Photos
"Man who stand on hill with mouth open will wait long time for roast duck to drop in." -- Confucious
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And when i write the string to a file, it doesnt get the newline bit right, you just get a bar.
So how do i get it to do a new line. (I would REALLY like to do this without having to do WriteLine every time i need a new line).
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Shouldn't you use \r\n instead?
-
Drew
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The correct way to do this is use Environment.NewLine as it will generate the correct newline sequence for the current platform.
My: Blog | Photos
"Man who stand on hill with mouth open will wait long time for roast duck to drop in." -- Confucious
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I have create a panel and then place a listBox control. I want to read a text file and place it into the listbox:
***************************************************************
listBox1.Text=" ";
listBox1.Location = new System.Drawing.Point(16,16);
listBox1.Size = new Size (320,220);
listBox1.BackColor = Color.FromArgb(255, 255,255);
panel1.Controls.AddRange(new Control[]{llistBox1});
// Open the file
SR = File.OpenText(@myFile.Text);
// Loop trough each character in the file
while((FileChar = SR.Read()) != -1)
{
// Display the text in the TextBox
listBox.Text += Convert.ToChar(FileChar);
}
// Close the reader
SR.Close();
}
****************************************************************
the above does not displays the text however if I use a labe then it works but I can not sroll the text once is displayed in the labe control.
Is there a better way to display the TXT in a list or label contrl?
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Well, i've just been doing this kind of stuff, if you want to add a line of the file to your list box then maybe you could:
StreamReader SR;<br />
<br />
FileStream FS = File.Open("location of file", FileMode.Open, FileAccess.Read);<br />
<br />
SR = new StreamReader(FS);<br />
<br />
listBox.Items.Add(SR.ReadLine());<br />
Then just keep doing that until you get to the end of the file, i'm too tired to think of the code right now, i'm only still up cus i'm watching children in need 
and dont forget to close and null your StreamReader
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The code seems to work right
**************************************************
StreamReader SR;
FileStream FS = File.Open("myFile.txt", FileMode.Open, FileAccess.Read);
SR = new StreamReader(FS);
while((FileChar = SR.Read()) != -1)
{
viewS.Items.Add(SR.ReadLine());
}
SR.Close();
****************************************************
but the first character in every line is truncated.
any idea?
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picasso2 wrote: The code seems to work right
picasso2 wrote: but the first character in every line is truncated.
Then it DOES NOT work right. Do as the other person suggested. You can't will the CPU to do something.
xacc.ide-0.1-rc4 released! Download and screenshots
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If you look at the code, you noticed that I "DID" what it was suggested.!!!!!
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Hi,
I am kind of new to C# and in my app I want to call a Win32 Dll(say TestController.dll)...
The Dll fn goes like:
<br />
TESTCONTROLLERDLL_API int fnGetDiagnosticsData(int iscrn,int* iWindowsMonNo ,int * itype,char * cSerialNumber,int * len)<br />
{<br />
int ireturn;<br />
.....<br />
return ireturn;<br />
}
In my C# calss to call this dll, I refferd to some articles in google that suggested me to do as:
public class ControllerTest<br />
{<br />
private int iScreenNumber=0;<br />
[MarshalAs(UnmanagedType.I4)]<br />
private int iWindowsMonNo = new int();<br />
[MarshalAs(UnmanagedType.I4)]<br />
private int itype = new int();<br />
[MarshalAs(UnmanagedType.I4)]<br />
private int iLen = new int();<br />
[MarshalAs(UnmanagedType.LPStr)]<br />
private StringBuilder szSerialNumber = new StringBuilder(100,100); <br />
[DllImport( "TestControllerDll.dll", CharSet = CharSet.Unicode )]<br />
public static extern int fnGetDiagnosticsData(int iscrn,[MarshalAs(UnmanagedType.I4)]int iWindowsMonNo ,[MarshalAs(UnmanagedType.I4)]int itype,[MarshalAs(UnmanagedType.LPStr)] StringBuilder cSerialNumber,[MarshalAs(UnmanagedType.I4)]int len);<br />
......<br />
<br />
fn call:<br />
int iControllerNumber = fnGetDiagnosticsData(iScreenNumber,iWindowsMonNo,itype,szSerialNumber,iLen);<br />
But I am getting Null Pointer exception during function call...Where am I going wrong?????
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I'm not an expert in PInvoking things, but something that caught my eye was:
int* iWindowsMonNo -->> [MarshalAs(UnmanagedType.I4)]int iWindowsMonNo
You have a pointer to an int, but on the other side you pass an int value. I suspect that iWindowsMonNo is set to 0 because the API expects to fill it. use ref int
The same goes for the other pointer types.
My: Blog | Photos
"Man who stand on hill with mouth open will wait long time for roast duck to drop in." -- Confucious
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Hello,
I have FormMain, which launches FormA and FormB. FormA launches a dialog box, and that dialog locks other windows. Meaning I can't access FormMain nor FormB. Is there a way of making it work in such a way that I can access FormMain and FormB, but not FormA?
Thank you.
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If FormA is opening a modal dialog box it will block access to all the other dialogs in your app until it's closed. AFAIK there's no way to create a dialog that's modal to it's parent, but not it's grandparents or uncles.
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Hello,
I have FormMain, which launches FormA and FormB. FormA launches a dialog box, and that dialog locks other windows. Meaning I can't access FormMain nor FormB. Is there a way of making it work in such a way that I can access FormMain and FormB, but not FormA?
Thank you.
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From the .NET Windows Forms MSDN article "Displaying Modal and Modeless Windows Forms":
A modal form or dialog box must be closed or hidden before you can continue working with the rest of the application.
To do what you want, you need a hack that allows your dialog to show in a modeless state and, while it shows, prevent FormA from receiving focus; that is, when FormA gets focus, the dialog steals it. For example, put the following code in FormA:
private void FormA_Load(object sender, System.EventArgs e)
{
Dialog d = new Dialog();
this.Activated += new EventHandler( d.FormA_Activated );
d.Show();
}
and the following code in your dialog class which I've ostensibly named Dialog:
public void FormA_Activated( object sender, EventArgs e )
{
this.Focus();
}
This will let the dialog window steal the show from FormA while it is opened and allow you to play with the main form and FormB.
"we must lose precision to make significant
statements about complex systems."
-deKorvin on uncertainty
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I'm looking for a faster way to determine AD inheritance. Example: User object "JDOE" is a member of security group "Test Group". "Test Group" is a member of "Test Group 2". The "JDOE" object does not show as being a member of "Test Group 2" exclusively, so a recursive search is the only way I've been able to figure it out. Problem with this is that it takes about 1 second per query -- if the user object belongs to a complex network of groups it takes a second for each group.
I a method that given the user object and group object, it will call itself for each group that its a member of recursively. In my case I belong to 14 groups, it had to query 23 group objects before it found "Test Group 2".
I may even be going about this the wrong way; perhaps AD is the wrong tool for the job. Any suggestions?
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Hello Everyone,
I have decided to learn C# , having a good C++ backgroung , could you recommend me a good C# programming book for beginners.
PS. My favourite C++ programming book is C++ How to Program - Harvey M. Deitel
"Success is the ability to go from one failure to another with no loss of enthusiasm." - W.Churchill
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"Programming c#" from O'Reilly. It doesn't cover all the really advanced topics but ~98% of what I've needed to do in c# so far was cover. YMMV
I have the 4th ed which is .net2.0 most of it's contents are back applicable to 1.1 if you're required to work in the old environment.
Be careful with the title O'Reilly also has a book targeted at nonprogrammers with an extremely similar name.
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I started with "Programming C#" from O'Reilly and it is a good book. But I picked up "Beginning Visual C#" from Wrox and I have to say that I prefer that one. I think it does a better job at explaining things. The first half is devoted to syntax using console application examples and the second half is devoted more towards the windows side of things using Windows application examples.
Sean
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Hello,
When I work with Microsoft.Office.Interop.Excel i have a error "Old format or invalid type library." becouse the culture is not set corectly. Then i set the culture for english and it's work:
oldCl = System.Threading.Thread.CurrentThread.CurrentCulture;
System.Threading.Thread.CurrentThread.CurrentCulture = new System.Globalization.CultureInfo("en-US");
...
System.Threading.Thread.CurrentThread.CurrentCulture = oldCl;
The problem is that i don't know what excel (what language) the user heve install. mybe he have excel in german... How can i find what kind of excel the user have install (englis version, german version...) to set then the culture for english or german?
Where i can find a list with all culture (code of culture)?
Thanks,
Mihai
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Hi, i have a project that uses a crystal report file. So i link this file to my access database and everythings is ok. But after creating the setup project and intalling it, the report is opening, there is no error, but there is no data in it. My guess is that here isn't anymore a connection with the database (because the setup changed the path or something). Does anone has any idea what this could be and how can i fix it? I'm trying to solve this problem for 2 weeks now and...no results so far.
Thanks!
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