LogonUser API

[Dan]

All,

I am attempting to use the LogonUser API in an
application. However, everytime I attempt to validate an
account using this I get an error. The code is 1421 which
has a description of "Control ID not found". I can't find
any information on what could be causing this error. Any
help would be appreciated. Thanks!

[Willy Denoyette [MVP]]

Error 1421 is not related to LogonUser, could you please post your code, or a small repro?

Willy.
"Dan" <dd*****@fnisol utions.com> wrote in message news:04******** *************** *****@phx.gbl.. .

All,

I am attempting to use the LogonUser API in an
application. However, everytime I attempt to validate an
account using this I get an error. The code is 1421 which
has a description of "Control ID not found". I can't find
any information on what could be causing this error. Any
help would be appreciated. Thanks!

[Dan]

Thanks for the response. Here is the code

public class LogonAPI
{
// Declare the logon types as constants
const long LOGON32_LOGON_I NTERACTIVE = 2;
const long LOGON32_LOGON_N ETWORK = 3;

// Declare the logon providers as constants
const long LOGON32_PROVIDE R_DEFAULT = 0;
const long LOGON32_PROVIDE R_WINNT50 = 3;
const long LOGON32_PROVIDE R_WINNT40 = 2;
const long LOGON32_PROVIDE R_WINNT35 = 1;

//Import Needed DLL
[DllImport("adva pi32.dll",Entry Point
= "LogonUser" )]
private static extern bool LogonUser(

string lpszUsername,

string lpszDomain,

string lpszPassword,

int dwLogonType,

int dwLogonProvider ,

ref IntPtr phToken);
public LogonAPI()
{
}

public bool ValidateLogin( string
Username, string Password, string Domain )
{
IntPtr token = new IntPtr(0);
token = IntPtr.Zero;

// Call the API
if (LogonUser(
Username,
Domain,
Password,
(int)
LOGON32_LOGON_N ETWORK,
(int)
LOGON32_PROVIDE R_DEFAULT,
ref token))
{
return true;
}
else
{
return false;
}
}

}

When I attempt to call the ValidateLogin function I always
get a return value of false. I then use the
System.Runtime. InteropServices .Marshal.GetLas tWin32Error()
function to get the error and it returns 1421.

Dan

-----Original Message-----
Error 1421 is not related to LogonUser, could you please post your code, or a small repro?
Willy.
"Dan" <dd*****@fnisol utions.com> wrote in message

news:04******** *************** *****@phx.gbl.. .

All,

I am attempting to use the LogonUser API in an
application. However, everytime I attempt to validate an
account using this I get an error. The code is 1421 which has a description of "Control ID not found". I can't find any information on what could be causing this error. Any
help would be appreciated. Thanks!

.

[Willy Denoyette [MVP]]

- Why const long for logontypes and provider constants, change them to int so no cast is needed when calling LogonUser.
- Add SetLastError=tr ue to your DllImport declaration.

Willy.

"Dan" <dd*****@fnisol utions.com> wrote in message news:0a******** *************** *****@phx.gbl.. .

Thanks for the response. Here is the code

public class LogonAPI
{
// Declare the logon types as constants
const long LOGON32_LOGON_I NTERACTIVE = 2;
const long LOGON32_LOGON_N ETWORK = 3;

// Declare the logon providers as constants
const long LOGON32_PROVIDE R_DEFAULT = 0;
const long LOGON32_PROVIDE R_WINNT50 = 3;
const long LOGON32_PROVIDE R_WINNT40 = 2;
const long LOGON32_PROVIDE R_WINNT35 = 1;

//Import Needed DLL
[DllImport("adva pi32.dll",Entry Point
= "LogonUser" )]
private static extern bool LogonUser(

string lpszUsername,

string lpszDomain,

string lpszPassword,

int dwLogonType,

int dwLogonProvider ,

ref IntPtr phToken);
public LogonAPI()
{
}

public bool ValidateLogin( string
Username, string Password, string Domain )
{
IntPtr token = new IntPtr(0);
token = IntPtr.Zero;

// Call the API
if (LogonUser(
Username,
Domain,
Password,
(int)
LOGON32_LOGON_N ETWORK,
(int)
LOGON32_PROVIDE R_DEFAULT,
ref token))
{
return true;
}
else
{
return false;
}
}

}

When I attempt to call the ValidateLogin function I always
get a return value of false. I then use the
System.Runtime. InteropServices .Marshal.GetLas tWin32Error()
function to get the error and it returns 1421.

Dan

-----Original Message-----
Error 1421 is not related to LogonUser, could you please

post your code, or a small repro?

Willy.
"Dan" <dd*****@fnisol utions.com> wrote in message

news:04******** *************** *****@phx.gbl.. .

All,

I am attempting to use the LogonUser API in an
application. However, everytime I attempt to validate an
account using this I get an error. The code is 1421 which has a description of "Control ID not found". I can't find any information on what could be causing this error. Any
help would be appreciated. Thanks!

.