CODEWITHSUNDEEP
.netexcel32bit-64bitexcel-interop
Suraj
Suraj

Reputation: 36547

Find bitness (32-bit/64-bit) from Excel Application object?

Is it possible to determine whether Excel is running in 32-bit or 64-bit from the Microsoft.Office.Interop.Excel.ApplicationClass?

Edit
The solution should work for both Excel 2010 and Excel 2007

Upvotes: 5

Views: 4262

Answers (2)

Stephan W.
Stephan W.

Reputation: 1

Maybe this could work (do it for me with Excel 2013 ff.)

try
{
    Type officeType = Type.GetTypeFromProgID("Excel.Application");
    object excelInstance = Activator.CreateInstance(officeType);
    if (excelInstance != null)
    {
        string results = officeType.InvokeMember("OperatingSystem", BindingFlags.GetProperty, null, excelInstance, null).ToString();
        if (!string.IsNullOrEmpty(results))
            detectedExcelPlatform = results.Contains("64")?EDetectExcelPlattform.Force64Bit:EDetectExcelPlattform.Force32Bit;
        officeType.InvokeMember("Quit", BindingFlags.InvokeMethod, null, excelInstance, null);
    }
}
catch
{
    // To Ignore
}

EDetectExcelPlattform doesn't matter, because it is only from my own code. Can be replaced with bool result.

Upvotes: 0

Simon Mourier
Simon Mourier

Reputation: 138925

This code should give you the "bitness" of Excel.

Microsoft.Office.Interop.Excel.ApplicationClass app = new Microsoft.Office.Interop.Excel.ApplicationClass();
if (System.Runtime.InteropServices.Marshal.SizeOf(app.HinstancePtr) == 8)
{
    // excel 64-bit
}
else
{
    // excel 32-bit
}

EDIT: here is another version that should work for previous versions of Excel as well. Just pass an ApplicationClass reference to it:

    public static ExcelVersion GetExcelVersion(object applicationClass)
    {
        if (applicationClass == null)
            throw new ArgumentNullException("applicationClass");

        PropertyInfo property = applicationClass.GetType().GetProperty("HinstancePtr", BindingFlags.Instance | BindingFlags.Public);
        if (property == null)
            return ExcelVersion.Excel;

        return (System.Runtime.InteropServices.Marshal.SizeOf(property.GetValue(applicationClass, null)) == 8) ? ExcelVersion.Excel2010_64 : ExcelVersion.Excel2010_32;
    }

    public enum ExcelVersion
    {
        Excel, // before 2010, so 32 bits
        Excel2010_32,
        Excel2010_64
    }

Upvotes: 9

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