无法在.Net中预览多个页面的tiff文件

时间:2009-04-14 18:11:15

标签: c# .net printing preview

我正在尝试从C#2005 Windows应用程序预览和打印多个页面TIFF文件。打印工作正常,但当我将PrintDocument发送到PrintPreviewDialog时,我得到第一页的两个图像而不是第一页和第二页的图像。当我使用PrintPreviewControl时,我也遇到了同样的问题。

以下是包含2个按钮的表单的代码,PrintDocument和PrintPreviewDialog,用于演示此问题。

public partial class Form1 : Form
{
    private Image m_Image;
    private Int32 m_CurrentPage;
    private Int32 m_PageCount;

    private void Form1_Load(object sender, EventArgs e)
    {
        m_Image = Image.FromFile(".\\Test-2-Page-Image.tif");
        m_PageCount = m_Image.GetFrameCount(FrameDimension.Page);
    }

    private void printDocument_BeginPrint(object sender, PrintEventArgs e)
    {
        m_CurrentPage = 0;
        m_PageCount = m_Image.GetFrameCount(FrameDimension.Page);
    }

    private void printDocument_PrintPage(object sender, PrintPageEventArgs e)
    {
        m_Image.SelectActiveFrame(FrameDimension.Page, m_CurrentPage);
        e.Graphics.DrawImage(m_Image, 0, 0);
        ++m_CurrentPage;
        e.HasMorePages = (m_CurrentPage < m_PageCount);
    }

    private void btnPreview_Click(object sender, EventArgs e)
    {
        printPreviewDialog.Document = printDocument;
        printPreviewDialog.ShowDialog();
    }

    private void btnPrint_Click(object sender, EventArgs e)
    {
        printDocument.Print();
    }
}

有没有人知道.Net框架中的PrintPreviewDialog是否存在问题,或者我做错了什么。

1 个答案:

答案 0 :(得分:3)

这是Graphics.DrawImage()函数的错误。

此处记录了问题:Graphics.DrawImage Bug

工作代码如下所示:

img.SelectActiveFrame(FrameDimension.Page, curPage);
using(MemoryStream stm = new MemoryStream())
{     
    img.Save(stm, imgCodecInfo, encParams); // save to memory stream
    Bitmap bmp = (Bitmap)Image.FromStream(stm);
    e.Graphics.DrawImage((Image)bmp,0,0);
    bmp.Dispose();
}