C# - Acrobat 9.4.5 - PrintPages not responsive

Question

I've been stuck on an issue for a month or so, and running out of ideas. I'm trying to use the Acrobat API's "PrintPages" method to print a PDF document. I'm able to load the PDFs in my WinForm just fine, populate their fields, etc. But whenever I invoke PrintPages, PrintPagesSilent, etc, the return value is "true", so everything seems fine, but nothing prints. I've tested with both local and network printers.
The PDF document I'm attempting to print is a single page document.
(I've tested printing with Reader and that works, but my application needs the ability to print multiple documents, and there are issues with using an AxAcroPDFLib.AxAcroPDF object and trying to close a file that was opened with LoadFile and opening a new file.)
CAcroAVDoc avDocCopyV = new AcroAVDocClass();
bool openResult = avDocCopyV.Open(pdfManagerService.CopyVFileName, ""); // the filename that is being passed has been verified to be correct through debugging
bool printPagesResult = avDocCopyV.PrintPages(0, 1, 3, 0, 0);
I've also tried using these combinations of parameters:
bool printPagesResult = avDocCopyV.PrintPages(0, 1, 2, 0, 0);
bool printPagesResult = avDocCopyV.PrintPages(0, 1, 3, 1, 0);
bool printPagesResult = avDocCopyV.PrintPages(0, 1, 2, 1, 0);
I've also tried calling 'GetNumPages' from the PDDoc object and using that as the second "PrintPages" parameter.
This was not working in Acrobat 7.0 that I had installed before. Our company had upgraded to Acrobat 9.0, so I installed that and even patched it to 9.4.5, but nothing is printing when I use "PrintPages".

Answer 1

I forgot to reply back, yes this did help me! I did not realize that I could go this route, and I may have overcomplicated it a bit, but in the end, it is now working!
(Note: calling methods from the JS object didn't work for me so I had to use reflection.)
Below is the code that I ended up using which worked for me, but posting it for those who may come across this and have similar issues. In summary, the JSON solution worked much better than using PrintPages (which I was originally attempting to use).
               object jsObj = null;
                CAcroAVDoc avDocCopyV = new AcroAVDocClass();
                avDocCopyV.Open(pdfFilename, "");
                Acrobat.CAcroPDDoc pdDoc = (Acrobat.CAcroPDDoc)avDocCopyV.GetPDDoc();
                jsObj = pdDoc.GetJSObject();
                invokeJSObjectPrint(jsObj);
                avDocCopyV.Close(0);
And the 'invokeJSObjectPrint' method is below. It is a bit long, but what it does is 1) obtain the default printer params, 2) obtain the 'constants.interactionLevel.silent' constant value, and assign that value to the printer params' 'interactive' property, 3) assign the name of the printer to the 'interactive.printerName' property, and finally 4) print the PDF to the printer.
        private void invokeJSObjectPrint(object jsObj)
            object printParamsObj = null;
            object[] singleParam = new object[1];
            Type T = jsObj.GetType();
            printParamsObj = T.InvokeMember("getPrintParams", System.Reflection.BindingFlags.InvokeMethod | System.Reflection.BindingFlags.Public |
                System.Reflection.BindingFlags.Instance, null, jsObj, null);
            Type printParamType = printParamsObj.GetType();
            // get property values
            object constantsProp = printParamType.InvokeMember("constants", System.Reflection.BindingFlags.GetProperty | System.Reflection.BindingFlags.Public |
                System.Reflection.BindingFlags.Instance, null, printParamsObj, null);
            object interactionLevelProp = constantsProp.GetType().InvokeMember("interactionLevel", System.Reflection.BindingFlags.GetProperty | System.Reflection.BindingFlags.Public |
                System.Reflection.BindingFlags.Instance, null, constantsProp, null);
            object silentProp = interactionLevelProp.GetType().InvokeMember("silent", System.Reflection.BindingFlags.GetProperty | System.Reflection.BindingFlags.Public |
                System.Reflection.BindingFlags.Instance, null, interactionLevelProp, null);
            // set property values
            singleParam[0] = silentProp;
            printParamType.InvokeMember("interactive", BindingFlags.SetProperty |
                BindingFlags.Public | BindingFlags.Instance, null, printParamsObj, singleParam);
            singleParam[0] = this.storedPrinterSettings.PrinterName;
            printParamType.InvokeMember("printerName", BindingFlags.SetProperty |
                BindingFlags.Public | BindingFlags.Instance, null, printParamsObj, singleParam);
            object[] printParamsObjArray = { printParamsObj };
            // invoke print with the updated printer settings
            if (printParamsObj != null)
                T.InvokeMember("print", System.Reflection.BindingFlags.InvokeMethod | System.Reflection.BindingFlags.Public |
                    System.Reflection.BindingFlags.Instance, null, jsObj, printParamsObjArray);
Thanks again for pointing me in the right direction.