C# SolidWorks secondary development API --- modify the value of global variables

Today, let's briefly talk about how to modify some of the data in the equation. Sometimes we can use this global variable to control the model for some simple models.

As shown in the figure below: I set the height equation of the part to be equal to the global variable h.

When we need to update the height, we can directly modify this global variable to achieve a simpler parameterization method.This global variable can be the information in the upper-level assembly.

 Let's specifically demonstrate how to find the api:

Open the api help file, search for the keyword globalvariable, and you will find the example on the right, which is an information acquisition.

This example shows how to get the values of equations.

//-----------------------------------------
// Preconditions:
// 1. Open public_documents\samples\tutorial\api\partequations.sldprt.
// 2. Open the Immediate window.
//
// Postconditions:
// 1. Gets each equation's value and index and whether the 
//    equation is a global variable. 
// 2. Examine the Immediate window.
//------------------------------------------
using SolidWorks.Interop.sldworks;
using SolidWorks.Interop.swconst;
using System.Runtime.InteropServices;
using System;
using System.Diagnostics;
 
namespace Macro1CSharp.csproj
{
    public partial class SolidWorksMacro
    {
        public void Main()
        {
            ModelDoc2 swModel = default(ModelDoc2);
            EquationMgr swEqnMgr = default(EquationMgr);
            int i = 0;
            int nCount = 0;
 
            swModel = (ModelDoc2)swApp.ActiveDoc;
            swEqnMgr = (EquationMgr)swModel.GetEquationMgr();
            Debug.Print("File = " + swModel.GetPathName());
            nCount = swEqnMgr.GetCount();
            for (i = 0; i < nCount; i++)
            {
                Debug.Print("  Equation(" + i + ")  = " + swEqnMgr.get_Equation(i));
                Debug.Print("    Value = " + swEqnMgr.get_Value(i));
                Debug.Print("    Index = " + swEqnMgr.Status);
                Debug.Print("    Global variable? " + swEqnMgr.get_GlobalVariable(i));
            }
 
        }
 
        /// <summary>
        ///  The SldWorks swApp variable is pre-assigned for you.
        /// </summary>
        public SldWorks swApp;
    }
}

We refer to this code to complete the reading of equation information: add a button to write code.

 The version after referring to the help file is probably:

Run it:

 

Let's make changes:

private void butGlobalVariables_Click(object sender, EventArgs e)
        {
            //连接solidworks
            ISldWorks swApp = Utility.ConnectToSolidWorks();

            if (swApp != null)
            {
                //获取当前模型
                ModelDoc2 swModel = (ModelDoc2)swApp.ActiveDoc;
                //定义方程式管理器
                EquationMgr swEqnMgr = default(EquationMgr);

                int i = 0;
                int nCount = 0;

                if (swModel != null)
                {
                    swEqnMgr = (EquationMgr)swModel.GetEquationMgr();
                    // nCount = swEqnMgr.GetCount();
                    //for (i = 0; i < nCount; i++)
                    //{
                    //    Debug.Print("  Equation(" + i + ")  = " + swEqnMgr.get_Equation(i));
                    //    Debug.Print("    Value = " + swEqnMgr.get_Value(i));
                    //    Debug.Print("    Index = " + swEqnMgr.Status);
                    //    Debug.Print("    Global variable? " + swEqnMgr.get_GlobalVariable(i));
                    //}

                    //修改高度为60

                    if (SetEquationValue(swEqnMgr, "h", 60))
                    {
                        swModel.ForceRebuild3(true);
                    }
                    else
                    {
                        MessageBox.Show("没有找到这个值!");
                    }
                }
            }
        }

        #region 修改全局变量所用到的方法

        public bool SetEquationValue(EquationMgr eqMgr, string name, double newValue)
        {
            int index = GetEquationIndexByName(eqMgr, name);

            if (index != -1)
            {
                eqMgr.Equation[index] = "\"" + name + "\"=" + newValue;

                return true;
            }
            else
            {
                return false;
            }
        }

        //通过名字找方程式的位置
        private int GetEquationIndexByName(EquationMgr eqMgr, string name)
        {
            int i;
            for (i = 0; i <= eqMgr.GetCount() - 1; i++)
            {
                var eqName = eqMgr.Equation[i].Split('=')[0].Replace("=", "");

                eqName = eqName.Substring(1, eqName.Length - 2); // removing the "" symbols from the name

                if (eqName.ToUpper() == name.ToUpper())
                {
                    return i;
                }
            }

            return -1;
        }

        #endregion 修改全局变量所用到的方法

At this point, the height of the part has become 60. Let's talk about so much in this section.

Please download the final code from Code Cloud or github.