Question

在这里使用System.Drawing时遇到麻烦。

我正在尝试通过请求打印机的dpi并通过GetDeviceCaps计算相应的像素来构建适用于此处所有打印机的例程。

我的测试打印机得到600 dpi，所以我使用TenthOfAmmToPixels计算像素，我使用十分之一毫米指定测量值。

2个问题：

打印时测量关闭：30毫米。线尺34毫米。打印时

印刷线根本不是实线，它在屏幕上，但是当从打印机中滚出时，它在线条周围有一个奇怪的虚线阴影。

Image bmIm;

private void PrintImage(Image img)
{
    bmIm = img;

    PrintDocument pd = new PrintDocument();

    pd.OriginAtMargins = true;
    pd.DefaultPageSettings.Landscape = true;

    pd.PrintPage += new PrintPageEventHandler(pd_PrintPage);

    pd.Print();
}


public class PrinterBounds
{
  [DllImport("gdi32.dll")]
private static extern Int32 GetDeviceCaps(IntPtr hdc, Int32 capindex);

private const int HORZRESoffset = 8;
private const int HORZSIZEoffset = 4;


public readonly int HORZRES;
public readonly int HORZSIZE;

public PrinterBounds(PrintPageEventArgs e)
{
    IntPtr hDC = e.Graphics.GetHdc();

    HORZRES = GetDeviceCaps(hDC, HORZRESoffset);
    HORZSIZE = GetDeviceCaps(hDC, HORZSIZEoffset);

    e.Graphics.ReleaseHdc(hDC);
}

}

   void pd_PrintPage(object sender, PrintPageEventArgs e)
 {
    PrinterBounds objBounds = new PrinterBounds(e);

    var HORZSIZE = objBounds.HORZSIZE;
    var HORZRES = objBounds.HORZRES;

    double dpi = 254 * HORZRES / HORZSIZE / 10;

    Bitmap label = new Labels().GetPackingLabel("000100000001", dpi);

    e.Graphics.DrawImage(label, 0, 0);

}

 public class Labels
 {
public Bitmap GetPackingLabel(Bandit bandit, double dblDpiDevice)
{
    int dpiDevice = Convert.ToInt32(dblDpiDevice);

    Bitmap label = new Bitmap(TenthOfAmmToPixels(1000, dpiDevice), TenthOfAmmToPixels(1000, dpiDevice));

    Graphics g = Graphics.FromImage(label);

    String drawString = "Sample Text";
    Font drawFont = new Font("Arial", 16);
    SolidBrush drawBrush = new SolidBrush(Color.Black);

    Pen pen = new Pen(drawBrush);
    pen.DashStyle = DashStyle.Solid;

    StringFormat drawFormat = new StringFormat();
    drawFormat.FormatFlags = StringFormatFlags.DirectionVertical;

    g.DrawString("test string", drawFont, drawBrush, TenthOfAmmToPixels(100, dpiDevice), TenthOfAmmToPixels(100, dpiDevice));

    //3 cm?
    g.DrawLine(pen, TenthOfAmmToPixels(0, dpiDevice), TenthOfAmmToPixels(350, dpiDevice), TenthOfAmmToPixels(300, dpiDevice), TenthOfAmmToPixels(350, dpiDevice));


    return label;

}

public int TenthOfAmmToPixels(double tiendes, double ppi)
{
    double result = (double)(tiendes * ppi / 254);

    return Convert.ToInt32(result);

}

}

System.Drawing以精确的毫米为单位打印实线

0 个答案: