回應： How to protect Excel document with ActiveX

[Micron1234]

Hi,

I want to protect the Excel report generated by my program and found this function Excel_WorksheetProtect() in excel2000.c

Is there any piece of example code which I can refer? I couldn't find any help from the CVI manual.

[Billingsley]

similar discussion.

http://forums.ni.com/t5/LabVIEW/Unprotect-and-Protect-Excel-in-LabVIEW-8-6-1/m-p/1019452

[D_Biel]

Here is a KB article that describes how to install the help for the Office ActiveX libraries.

http://digital.ni.com/public.nsf/allkb/8F5C9B290B68EBD286256FB700680D23?OpenDocument

This article is actually for Office 2003, but the same idea can be applied to 2007. More information can be found in the Microsoft KB as well.

http://support.microsoft.com/kb/q222101/en-us

[dcl9000]

They just don't want to give you a clear and exact answer, do they?

Here's how you save your Excel worksheet with password protection:

-----------------------------------------------------------------------------------------------------------------------

 //... modified from excel2000dem.c shipped with your CVI

 // ... assuming a current Excel file is opened, activated, and ready to be saved

 // .... the workseet handle is "ExcelWorkbookHandle"

    HRESULT error = 0;
    VARIANT myVariant1, myVariant2;
    char fileName[MAX_PATHNAME_LEN];

                GetProjectDir (fileName);     // must have directory's path

                // save the current opened file to a different file name with password protection
                strcat (fileName, "\\exceldem1.xls");     // The two backslashes "\\" must be included here   
                
                   error = CA_VariantSetCString(&myVariant1, fileName);
                   if (error < 0)  goto Error;
                   
                   error = CA_VariantSetCString(&myVariant2, "xyz123");      // password is xyz123
                   if (error < 0)  goto Error;
                   
                   error = Excel_WorkbookSaveAs (ExcelWorkbookHandle, NULL, myVariant1,
                                                 CA_DEFAULT_VAL, CA_DEFAULT_VAL,
                                                 myVariant2, CA_VariantBool(VTRUE),
                                                 CA_DEFAULT_VAL, ExcelConst_xlNoChange,
                                                 CA_DEFAULT_VAL, CA_DEFAULT_VAL,
                                                 CA_DEFAULT_VAL, CA_DEFAULT_VAL);
                   if (error < 0)  goto Error;

-----------------------------------------------------------------------------------------------------------------------

You'll see the password request when you open the file "exceldem1.xls".

[Micron1234]

Thanks all,

I just plugged in all unknown parameters with "CA_DEFAULT_VAL" and everything was done. 🙂

[Shako]

Does anyone know how to open an excel sheet with the password.

I would like to the file to have a password but when opened with my program it must not ask the user to enter the password. It must enter the password automatically.

[dcl9000]

When you open the Excel workbook in your program, use this function (as shown in the excel2000demo.prj):

                CA_VariantSetCString(&myVariant2, "xyz123");           // password is xyz123
                Excel_WorkbooksOpen (ExcelWorkbooksHandle, NULL, fileName,
                                             CA_DEFAULT_VAL, CA_DEFAULT_VAL,
                                             CA_DEFAULT_VAL, CA_DEFAULT_VAL,
                                             myVariant2, CA_VariantBool(VTRUE),
                                             CA_DEFAULT_VAL, CA_DEFAULT_VAL,
                                             CA_DEFAULT_VAL, CA_DEFAULT_VAL,
                                             CA_DEFAULT_VAL, CA_DEFAULT_VAL,
                                             &ExcelWorkbookHandle);

It will open the password protected file and enter the password automatically.