Render report as PNG and set image size

[Roman]

Hi there

I'm trying to change the image size of a report when saving it as PNG file. I'm using this code to render the report and save it as PNG file:

private static void RenderReport()
{
    ReportProcessor reportProcessor = new ReportProcessor();
    Hashtable info = new Hashtable();
    info["OutputFormat"] = "PNG";

    InstanceReportSource reportSource = new InstanceReportSource();
    reportSource.ReportDocument = new BucherLabel(nSalDocInternalNo, nSalDocItemInternalNo, nSalDocItemNo);

    reportProcessor.RenderReport("IMAGE", reportSource, info, CreateStream, out string docName);
    CloseStreams();
}

private static Stream CreateStream(string sFileName, string sExtension, Encoding encoding, string sMimeType)
{
    string sPath = $@"K:\Daten\SRM\FileOrder\{nSupplNo}\Labels\";
    sFileName = $"{nSalDocInternalNo},{nSalDocItemInternalNo}";

    if (!Directory.Exists(sPath))
        Directory.CreateDirectory(sPath);

    string sFilePath = Path.Combine(sPath, $"{sFileName}.{sExtension}");
    FileStream fs = new FileStream(sFilePath, FileMode.Create);
    lStreams.Add(fs);

    return fs;
}

private static void CloseStreams()
{
    foreach (Stream s in lStreams)
        s.Close();

    lStreams.Clear();
}

It works pretty fine. But I don't know how to set the filesize. Is this even possible?

Regards,
Roman

[Todor]

Hi Roman,

I suggest to render the report in EMF as it is vector format, i.e. lossless when resizing. Then you may use the standard image processing in .NET to resize the rendered document and save it with the required image size in PNG.

You may also use the DPI settings in the Image Device Info to control the resolution of the generated image. This will make the image look bigger in smaller resolution.

Regards,
Todor
Progress Telerik

[Roman]

Hi Todor,

Using EMF format works great, thanks for the solution :)

Regards,
Roman