How to use PSI web service?

For any development regarding project server 2007 or project web access (PWA), we need to use PSI (project service interface) provided by project server.

There are many web service provided for different- different operation. Here is the MSDN link for Finding the PSI Web Services.

But first question is How to use PSI web service?
For that you need to login first for using any of the web service.

So here is the post how to login to use PSI web service?

For login we have to use “_vti_bin/PSI/LoginWindows.asmx” web service.

Here is the code snippet to login using loginwindows.asmx

private LoginWindows objLoginWindows = null;
private void button8_Click(object sender, EventArgs e)
{
if (Login())
{
//go ahead
}
else
{
//throw login failed error
}
}

private bool Login()
{
try
{
SetCredentials();
return objLoginWindows.Login();
}
catch (Exception ex)
{
return false;
}
}

private void SetCredentials()
{
try
{
objLoginWindows.Url = "http://pwaserver:7777/pwa/_vti_bin/PSI/LoginWindows.asmx";
//use dynamic referance and use url from web/app.config
objLoginWindows.Credentials = CredentialCache.DefaultCredentials;
//DefaultCredentials will use curently login user
}
catch
{
//log your error;
}
}

This way you can log in using loginwindows.asmx

After login successfully you can use any other web service according your permission.

Note: you have to need login every time whenever you want to access PSI.
Note: its good practice to log off using Logoff() method of the same loginwindows.asmx after completion of your work.

objLoginWindows.Logoff();