Solidworks API and Winforms C# swApp (Standalone)

问题

This is what solidworks tells you to do to reference swApp, but I keep getting NullReferenceException on the line that it is referenced.

Does anyone have any idea why? or How I go about repairing?

Can I reference it later on such as swApp = ????

private void button5_Click(object sender, EventArgs e)
{
    //Save Drawing
    ModelDoc2 swDoc = null;
    int longstatus = 0;
    swDoc = ((ModelDoc2)(swApp.ActiveDoc));
    longstatus = swDoc.SaveAs3(
            @"C:\Engineering\Engineering\SW Automation\Linear Actuator Technology\MLD Series\Prints\Configured Prints\" + 
            textBox1.Text + ".SLDDRW", 0, 2);
}

public SldWorks swApp;

回答1:

Figured it out thanks for the help everyone.

SldWorks swApp = null;
swApp = (SldWorks)Activator.CreateInstance(
            Type.GetTypeFromProgID("SldWorks.Application"));

回答2:

Somewhere you're going to have to populate swApp. I don't use SolidWorks so I can't give you the exact code but look in the constructor of their example code. Maybe you can find an example of how swApp is populated there.

来源：https://stackoverflow.com/questions/7420697/solidworks-api-and-winforms-c-sharp-swapp-standalone