DllImport Help

  • Thread starter Thread starter MDB
  • Start date Start date
M

MDB

Hello All, I am tring to call a function within a third party DLL and keep
getting the following error:

MissingMethodException

According to the dumpbin results, there is a function calle IBT_on however,
I can't seem to access it.
ordinal hint rva name
1 0 000025SC ?IBT_on@@YAIXZ

Here is what my code looks like that is importing the DLL:

[DllImport("IBT.dll")]
private static extern Int32 IBT_on();

Dll name is IBT.dll

Also, the dll is located in my windows directory and my program directory.

Anyone know what I am doing wrong?
 
Yes,

Here is what that looks like:

private void button2_Click(object sender, System.EventArgs e)
{
try
{
IBT_on();
}
catch (Exception xxx)
{
MessageBox.Show(xxx.Message.ToString());
}
}




Duncan Mole said:
Are you calling it on an event?

MDB said:
Hello All, I am tring to call a function within a third party DLL and keep
getting the following error:

MissingMethodException

According to the dumpbin results, there is a function calle IBT_on however,
I can't seem to access it.
ordinal hint rva name
1 0 000025SC ?IBT_on@@YAIXZ

Here is what my code looks like that is importing the DLL:

[DllImport("IBT.dll")]
private static extern Int32 IBT_on();

Dll name is IBT.dll

Also, the dll is located in my windows directory and my program directory.

Anyone know what I am doing wrong?
Click to expand...
Click to expand...
 
Since the function name is mangled, you'll need to specify the ordinal or
name explicitly using the EntryPoint member of the DllImport attribute e.g.
[DllImport("IBT.dll", EntryPoint="#1")]
private static extern Int32 IBT_on();

or

[DllImport("IBT.dll", EntryPoint="?IBT_on@@YAIXZ")]
private static extern Int32 IBT_on();

Peter
 
That did it. Thank you for your help!


Peter Foot said:
Since the function name is mangled, you'll need to specify the ordinal or
name explicitly using the EntryPoint member of the DllImport attribute e.g.
[DllImport("IBT.dll", EntryPoint="#1")]
private static extern Int32 IBT_on();

or

[DllImport("IBT.dll", EntryPoint="?IBT_on@@YAIXZ")]
private static extern Int32 IBT_on();

Peter

--
Peter Foot
Windows Embedded MVP
www.inthehand.com | www.opennetcf.org

MDB said:
Hello All, I am tring to call a function within a third party DLL and keep
getting the following error:

MissingMethodException

According to the dumpbin results, there is a function calle IBT_on
however,
I can't seem to access it.
ordinal hint rva name
1 0 000025SC ?IBT_on@@YAIXZ

Here is what my code looks like that is importing the DLL:

[DllImport("IBT.dll")]
private static extern Int32 IBT_on();

Dll name is IBT.dll

Also, the dll is located in my windows directory and my program directory.

Anyone know what I am doing wrong?
Click to expand...
Click to expand...
 
The other option is to actually use the name dumpbin gave you (including the
@@YAIXZ).

--
Chris Tacke, eMVP
Co-Founder and Advisory Board Member
www.OpenNETCF.org
---
---
Principal Partner
OpenNETCF Consulting
www.OpenNETCF.com



MDB said:
That did it. Thank you for your help!


Peter Foot said:
Since the function name is mangled, you'll need to specify the ordinal or
name explicitly using the EntryPoint member of the DllImport attribute e.g.
[DllImport("IBT.dll", EntryPoint="#1")]
private static extern Int32 IBT_on();

or

[DllImport("IBT.dll", EntryPoint="?IBT_on@@YAIXZ")]
private static extern Int32 IBT_on();

Peter

--
Peter Foot
Windows Embedded MVP
www.inthehand.com | www.opennetcf.org

MDB said:
Hello All, I am tring to call a function within a third party DLL and keep
getting the following error:

MissingMethodException

According to the dumpbin results, there is a function calle IBT_on
however,
I can't seem to access it.
ordinal hint rva name
1 0 000025SC ?IBT_on@@YAIXZ

Here is what my code looks like that is importing the DLL:

[DllImport("IBT.dll")]
private static extern Int32 IBT_on();

Dll name is IBT.dll

Also, the dll is located in my windows directory and my program directory.

Anyone know what I am doing wrong?
Click to expand...
Click to expand...
Click to expand...
 
I think the compiler would not agree to an identifier that starts with "?"
<g>

--
Alex Feinman
---
Visit http://www.opennetcf.org
Chris Tacke said:
The other option is to actually use the name dumpbin gave you (including the
@@YAIXZ).

--
Chris Tacke, eMVP
Co-Founder and Advisory Board Member
www.OpenNETCF.org
---
---
Principal Partner
OpenNETCF Consulting
www.OpenNETCF.com



MDB said:
That did it. Thank you for your help!


Peter Foot said:
Since the function name is mangled, you'll need to specify the ordinal or
name explicitly using the EntryPoint member of the DllImport attribute e.g.
[DllImport("IBT.dll", EntryPoint="#1")]
private static extern Int32 IBT_on();

or

[DllImport("IBT.dll", EntryPoint="?IBT_on@@YAIXZ")]
private static extern Int32 IBT_on();

Peter

--
Peter Foot
Windows Embedded MVP
www.inthehand.com | www.opennetcf.org

"MDB" <nospam> wrote in message
Hello All, I am tring to call a function within a third party DLL
Click to expand...
and
keep
getting the following error:

MissingMethodException

According to the dumpbin results, there is a function calle IBT_on
however,
I can't seem to access it.
ordinal hint rva name
1 0 000025SC ?IBT_on@@YAIXZ

Here is what my code looks like that is importing the DLL:

[DllImport("IBT.dll")]
private static extern Int32 IBT_on();

Dll name is IBT.dll

Also, the dll is located in my windows directory and my program directory.

Anyone know what I am doing wrong?
Click to expand...
Click to expand...
Click to expand...
 
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