Dr. Zharkov wrote:
>
> Inform, please, where in a code on C# an error?
>

http://www.pinvoke.net/default.aspx/...puterName.html

-cd

I see one obvious difference:

> Dim myComputerName As String = Space(30)

versus

> string myComputerName = "";

I don't really know how these things work, but I'd try changing that to:

string myComputerName = " ";

and see if it makes a difference.




"Dr. Zharkov" <valery-(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Hello. To define a name of a computer in project VS 2005 after click of
> Button1 on Form1, on Visual Basic such code is used:
>
>
>
> Declare Auto Function GetComputerName Lib "kernel32.dll" _
>
> Alias "GetComputerName" (ByVal buf As String, _
>
> ByRef size As Integer) As Integer
>
>
>
> Private Sub Button1_Click(ByVal sender As System.Object, _
>
> ByVal e As System.EventArgs) Handles Button1.Click
>
> Dim myComputerName As String = Space(30)
>
> Dim Length As Integer = 30
>
> Dim ReturnValue As Integer
>
> ReturnValue = GetComputerName(myComputerName, Length)
>
> MsgBox("Name of my computer: " & myComputerName)
>
> End Sub
>
>
>
> In other same project VS 2005, I have copied this code on Visual C# as
> follows:
>
>
>
> [System.Runtime.InteropServices.DllImport("kernel32.dll")]
>
> public static extern int GetComputerName(string buf, ref int size);
>
>
>
> private void button1_Click(object sender, EventArgs e)
>
> {
>
> string myComputerName = "";
>
> int Length = 30;
>
> int ReturnValue;
>
> ReturnValue = GetComputerName(myComputerName, ref Length);
>
> MessageBox.Show("Name of my computer: " + myComputerName);
>
> }
>
>
>
> Building this code occurs without errors, however the name of a computer
> is
> not deduced.
>
> Inform, please, where in a code on C# an error?
>
> Beforehand thanks for the answer, Valeriy, Moskva, Russia.
>
>

Why use the extern, when you can use System.Environment.MachineName?

(mentioned in the article Carl linked to, but worth mentioning
explicitely.)

Marc

> private void button1_Click(object sender, EventArgs e)
>
> {
>
string myComputerName;

myComputerName =
System.Windows.Forms.SystemInformation.ComputerName;

MessageBox.Show("Name of my computer: " +
myComputerName);

>
> }

Regards JTC ^..^

Like so:

using System;
class Program {
static void Main() {
string machineName = System.Environment.MachineName;
}
}

Only needs a reference to System; there is a "forms" way to do it, but
that needs more references.

Marc

Why this obsession with calling the kernel32 function; in both your
examples *you already have the name*, so you don't need the PInvoke
step. At all.

Marc

Hello. To define a name of a computer in project VS 2005 after click of
Button1 on Form1, on Visual Basic such code is used:



Declare Auto Function GetComputerName Lib "kernel32.dll" _

Alias "GetComputerName" (ByVal buf As String, _

ByRef size As Integer) As Integer



Private Sub Button1_Click(ByVal sender As System.Object, _

ByVal e As System.EventArgs) Handles Button1.Click

Dim myComputerName As String = Space(30)

Dim Length As Integer = 30

Dim ReturnValue As Integer

ReturnValue = GetComputerName(myComputerName, Length)

MsgBox("Name of my computer: " & myComputerName)

End Sub



In other same project VS 2005, I have copied this code on Visual C# as
follows:



[System.Runtime.InteropServices.DllImport("kernel32.dll")]

public static extern int GetComputerName(string buf, ref int size);



private void button1_Click(object sender, EventArgs e)

{

string myComputerName = "";

int Length = 30;

int ReturnValue;

ReturnValue = GetComputerName(myComputerName, ref Length);

MessageBox.Show("Name of my computer: " + myComputerName);

}



Building this code occurs without errors, however the name of a computer is
not deduced.

Inform, please, where in a code on C# an error?

Beforehand thanks for the answer, Valeriy, Moskva, Russia.

Mr. Michael A. Covington. Many thanks for the recommendation, I have checked
up it, but she has not corrected a error.

Mr. Marc Gravell. Many thanks for the recommendation, but I do not know, how
it to use.



Mr. Carl Daniel.

Many thanks for very useful link. By means of this link, the code is carried
out without errors, shows a name of a computer and has such kind:



[System.Runtime.InteropServices.DllImport("Kernel32")]

static extern unsafe bool GetComputerName(byte* lpBuffer,

long* nSize);



private void button1_Click(object sender, EventArgs e)

{

byte[] buffor = new byte[512];

long size = buffor.Length;

unsafe

{

long* pSize = &size;

fixed (byte* pBuffor = buffor)

{

GetComputerName(pBuffor, pSize);

}

}

System.Text.Encoding textEnc =

new System.Text.ASCIIEncoding();

MessageBox.Show("Computer name: " +

textEnc.GetString(buffor));

}



Inform, please, and how this code to write down for Managed Visual C#?



Beforehand thanks for the answer, Valeriy, Moskva, Russia.

Mr. Marc Gravell. Many thanks for the help. With your help now such code on
C# correctly shows a name of a computer:



[System.Runtime.InteropServices.DllImport("kernel32.dll")]

public static extern int GetComputerName(string buf, ref int size);



private void button1_Click(object sender, EventArgs e)

{

string myComputerName = System.Environment.MachineName;

int Length = 30;

int ReturnValue;

ReturnValue = GetComputerName(myComputerName, ref Length);

MessageBox.Show("Name of my computer: " + myComputerName);

}



Mr. JazzTheCat. Many thanks for the help. With your help now such code on C#
correctly shows a name of a computer:



[System.Runtime.InteropServices.DllImport("kernel32.dll")]

public static extern int GetComputerName(string buf, ref int size);



private void button1_Click(object sender, EventArgs e)

{

string myComputerName =

System.Windows.Forms.SystemInformation.ComputerName;

int Length = 30;

int ReturnValue;

ReturnValue = GetComputerName(myComputerName, ref Length);

MessageBox.Show("Name of my computer: " + myComputerName);

}



Once again many thanks. Valeriy, Moskva, Russia.

Mr. Marc Gravell.

Thanks for your remark. Really, in my last letter the code can be written
down much easier:

private void button1_Click(object sender, EventArgs e)

{

MessageBox.Show("Name of my computer: " +

System.Environment.MachineName);

}



I want to understand with a technique of application of dynamic-link library
(DLL).

Excuse me, please, but at me the same request to inform, how to change a
code resulted below, that with help DLL and Managed C# this code deduced a
name of a computer (by analogy to the code resulted earlier on Visual
Basic)?



[System.Runtime.InteropServices.DllImport("kernel32.dll")]

public static extern int GetComputerName(string buf, ref int size);



private void button1_Click(object sender, EventArgs e)

{

string myComputerName = "";

int Length = 30;

int ReturnValue;

ReturnValue = GetComputerName(myComputerName, ref Length);

MessageBox.Show("Name of my computer: " + myComputerName);

}

Beforehand thanks for the answer, Valeriy, Moskva, Russia.