problems using dllimport

  • Thread starter Thread starter Paul Duncan
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Paul Duncan

diggityduncs (Programmer) Nov 13, 2003
Hello,

I'm tring to use a win32/api dll in c#

The vendor I received the dll from doesn't know anything
about .net

I received two files
ACGAPI.DLL +
ACGAPI.LIB

and some example source code

Declaration:

Visual C/C++

extern "C" __declspec(dllimport) int __stdcall
V5_CalculateActivationCode(LPSTR lpSiteCode, LPSTR
lpProgramID, DWORD CustomFeatures, LPSTR
lpActivationCode, LPSTR lpRemovalCode)

Visual basic:

Declare Function V5_CalculateInitCode Lib "ACGAPI.DLL"
Alias "_V5_CalculateInitCode@20" (ByVal SiteCode As
String, ByVal ProgramID As String, ByVal CustomFeatures
As Long, ByVal ActivationCode As String, ByVal
RemovalCode As String) As Long

Parameters:

(in)

LPSTR lpSiteCode - Pointer to Site code string (8
characters long)

LPSTR lpProgramID - Pointer to ProgramID (24 characters
long)

DWORD CustomFeatures - Status of custom features (set to
0 if custom features are not required)

(out)
LPSTR lpActivationCode - Pointer to buffer for activation
code (should be at least 36 character long)

LPSTR lpRemovalCode - Pointer to buffer for removal code
(should be at least 9 character long)



This is code I came up with

using System.Runtime.InteropServices;

[DllImport("acgapi.dll")]
private static extern long V5_CalculateActivationCode
(string SiteCode,string ProgramID,long
CustomFeatures,string ActivationCode,string RemovalCode);

I get the following error when I run the code

Unable to find an entry point named
V5_CalculateActivationCode in DLL acgapi.dll


I believe it may something to do with the .lib file. In
the old visual studio you could add the .lib file in the
project settings

http://www.codeproject.com/audio/speech.asp?print=true

but I'm not sure where you do this VS.net


Any help here would greatly be appreciated,
Thanks,
Paul
 
You don't need the lib file, you need an entry point:
[DllImport("acgapi.dll", EntryPoint="_V5_CalculateInitCode@20")]
private static extern int V5_CalculateActivationCode
(string SiteCode,string ProgramID,int
CustomFeatures,string ActivationCode,string RemovalCode);
Click to expand...

Note that longs in vb6 are ints in c#.

--
Michael Culley


Paul Duncan said:
diggityduncs (Programmer) Nov 13, 2003
Hello,

I'm tring to use a win32/api dll in c#

The vendor I received the dll from doesn't know anything
about .net

I received two files
ACGAPI.DLL +
ACGAPI.LIB

and some example source code

Declaration:

Visual C/C++

extern "C" __declspec(dllimport) int __stdcall
V5_CalculateActivationCode(LPSTR lpSiteCode, LPSTR
lpProgramID, DWORD CustomFeatures, LPSTR
lpActivationCode, LPSTR lpRemovalCode)

Visual basic:

Declare Function V5_CalculateInitCode Lib "ACGAPI.DLL"
Alias "_V5_CalculateInitCode@20" (ByVal SiteCode As
String, ByVal ProgramID As String, ByVal CustomFeatures
As Long, ByVal ActivationCode As String, ByVal
RemovalCode As String) As Long

Parameters:

(in)

LPSTR lpSiteCode - Pointer to Site code string (8
characters long)

LPSTR lpProgramID - Pointer to ProgramID (24 characters
long)

DWORD CustomFeatures - Status of custom features (set to
0 if custom features are not required)

(out)
LPSTR lpActivationCode - Pointer to buffer for activation
code (should be at least 36 character long)

LPSTR lpRemovalCode - Pointer to buffer for removal code
(should be at least 9 character long)



This is code I came up with

using System.Runtime.InteropServices;

[DllImport("acgapi.dll")]
private static extern long V5_CalculateActivationCode
(string SiteCode,string ProgramID,long
CustomFeatures,string ActivationCode,string RemovalCode);

I get the following error when I run the code

Unable to find an entry point named
V5_CalculateActivationCode in DLL acgapi.dll


I believe it may something to do with the .lib file. In
the old visual studio you could add the .lib file in the
project settings

http://www.codeproject.com/audio/speech.asp?print=true

but I'm not sure where you do this VS.net


Any help here would greatly be appreciated,
Thanks,
Paul
Click to expand...
 
Hi Paul,

The lib files are for the Visual C++ to static link the dll files.
While the interop the dll use the dynamic call, it does not need the lib
files.
For more information about lib files, you can check:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccore/html
/_core_lib_reference.asp

I think you should check the return type of your function. Also, you can
use EntryPoint field to specify a function entry.

Hope this helps,
Best regards,
Jeffrey Tan
Microsoft Online Partner Support
Get Secure! - www.microsoft.com/security
This posting is provided "as is" with no warranties and confers no rights.

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| Subject: problems using dllimport
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| diggityduncs (Programmer) Nov 13, 2003
| Hello,
|
| I'm tring to use a win32/api dll in c#
|
| The vendor I received the dll from doesn't know anything
| about .net
|
| I received two files
| ACGAPI.DLL +
| ACGAPI.LIB
|
| and some example source code
|
| Declaration:
|
| Visual C/C++
|
| extern "C" __declspec(dllimport) int __stdcall
| V5_CalculateActivationCode(LPSTR lpSiteCode, LPSTR
| lpProgramID, DWORD CustomFeatures, LPSTR
| lpActivationCode, LPSTR lpRemovalCode)
|
| Visual basic:
|
| Declare Function V5_CalculateInitCode Lib "ACGAPI.DLL"
| Alias "_V5_CalculateInitCode@20" (ByVal SiteCode As
| String, ByVal ProgramID As String, ByVal CustomFeatures
| As Long, ByVal ActivationCode As String, ByVal
| RemovalCode As String) As Long
|
| Parameters:
|
| (in)
|
| LPSTR lpSiteCode - Pointer to Site code string (8
| characters long)
|
| LPSTR lpProgramID - Pointer to ProgramID (24 characters
| long)
|
| DWORD CustomFeatures - Status of custom features (set to
| 0 if custom features are not required)
|
| (out)
| LPSTR lpActivationCode - Pointer to buffer for activation
| code (should be at least 36 character long)
|
| LPSTR lpRemovalCode - Pointer to buffer for removal code
| (should be at least 9 character long)
|
|
|
| This is code I came up with
|
| using System.Runtime.InteropServices;
|
| [DllImport("acgapi.dll")]
| private static extern long V5_CalculateActivationCode
| (string SiteCode,string ProgramID,long
| CustomFeatures,string ActivationCode,string RemovalCode);
|
| I get the following error when I run the code
|
| Unable to find an entry point named
| V5_CalculateActivationCode in DLL acgapi.dll
|
|
| I believe it may something to do with the .lib file. In
| the old visual studio you could add the .lib file in the
| project settings
|
| http://www.codeproject.com/audio/speech.asp?print=true
|
| but I'm not sure where you do this VS.net
|
|
| Any help here would greatly be appreciated,
| Thanks,
| Paul
|
 
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