Print Preview will not appear and no exception is thrown

Lpatz-4663 20

Hello,

We have an application that is using a winforms webbrowser control to display an html document.

To show a print preview, we are using: SHDocVw.IWebBrowser2.ExecWB(SHDocVw.OLECMDID.OLECMDID_PRINTPREVIEW...)

command where we are passing in a path to an IE Print Template File. The template file uses a slightly modified version of the TemplatePrinter example provided in this link: Link

The only modification was adding a print button in the print preview, which calls the "DoPrint" javascript function when button is pressed.

Here is the problem:

When a user prints the html document through the template file, the SHDocVw.IWebBrowser2.ExecWB(SHDocVw.OLECMDID.OLECMDID_PRINTPREVIEW...) cannot be called again. This results in the print preview window to not appear again when user selects that option. No exception is thrown when this happens.

We would like to use the SHDocVw.IWebBrowser2.ExecWB(SHDocVw.OLECMDID.OLECMDID_PRINTPREVIEW...) command without passing in a template file. Is there a way to do this? We also need to set the margins, header, footer, and the zoom. Programmatically.

Any suggestions or advice is greatly appreciated!

Thanks

Jiale Xue - MSFT 43,046 Microsoft Vendor

Hi @Lpatz-4663 , Welcome to Microsoft Q&A,

I'm not very familiar with the class you're using. You can try to use the SHDocVw.IWebBrowser2.ExecWB command directly to display a print preview without passing a template file. You can set margins, header, footer, and zoom with the following code:


using SHDocVw;

private void ShowPrintPreview()

{

     // Get the COM interface of the WebBrowser control

     IWebBrowser2 browser = (IWebBrowser2)webBrowser1.ActiveXInstance;

     //Show print preview

     object o = null;

     browser.ExecWB(OLECMDID.OLECMDID_PRINTPREVIEW, OLECMDEXECOPT.OLECMDEXECOPT_DONTPROMPTUSER, ref o);

     // Set margins, header, footer and zoom

     object[] param = new object[15];

     param[0] = (int)DIALOG_UNIT.DU_MM; // Use millimeters as the unit

     param[1] = (int)10; // top margin

     param[2] = (int)10; // bottom margin

     param[3] = (int)10; // left margin

     param[4] = (int)10; // right margin

     param[5] = 1; // print header

     param[6] = "Header content"; // Header content

     param[7] = 1; // print footer

     param[8] = "footer content"; // footer content

     param[9] = 100; // scaling percentage

     param[10] = 1; //Print background

     param[11] = 0; // Print horizontally

     param[12] = 0; // print vertically

     param[13] = 0; // preview

     param[14] = 0; // reserved

     //Set printing parameters

     browser.ExecWB(OLECMDID.OLECMDID_PAGESETUP, OLECMDEXECOPT.OLECMDEXECOPT_DONTPROMPTUSER, ref param);

}

This allows you to display a print preview and set margins, headers, footers, and scaling without passing a template file.

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Print Preview will not appear and no exception is thrown