我正在尝试从C#2005 Windows应用程序预览和打印多页TIFF文件。打印效果很好,但是当我将PrintDocument发送到PrintPreviewDialog时,得到的是第一页的两个图像,而不是第一页和第二页的图像。当我使用PrintPreviewControl时,我也有同样的问题。

下面是带有2个按钮的表单的代码,一个PrintDocument和一个PrintPreviewDialog演示了此问题。

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();
    }
}


有谁知道.Net框架中的PrintPreviewDialog是否存在问题,或者我做错了什么。

最佳答案

Graphics.DrawImage()函数是一个错误。

该问题记录在这里: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();
}

10-06 07:53