1、获取默认打印机
PrintDocument fPrintDocument = new PrintDocument(); string defaultPrinter = fPrintDocument.PrinterSettings.PrinterName;
2、获取所有可用打印机
for (int i = 0; i < PrinterSettings.InstalledPrinters.Count; i++)
{
string tmp = PrinterSettings.InstalledPrinters[i];
if (tmp == defaultPrinter)
{
tmp = tmp + "(默认)";
}
lb_devices.Items.Add(tmp);
}3、设置指定打印机为默认打印机
[DllImport("winspool.drv")]
public static extern bool SetDefaultPrinter(String Name); //调用win api将指定名称的打印机设置为默认打印机
SetDefaultPrinter("打印机名");4、直接打印
1、添加一个控件System.Drawing.Printing.PrintDocument
2、添加printDocument1_PrintPage事件（GetBitmap()方法是自定义的GDI画打印图片的）
private void printDocument1_PrintPage(object sender, PrintPageEventArgs e)
{
e.Graphics.SmoothingMode = SmoothingMode.HighQuality;
e.Graphics.CompositingQuality = CompositingQuality.HighQuality;
e.Graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
e.HasMorePages = false;
e.Graphics.Clear(Color.White);
e.Graphics.DrawImage(GetBitmap(), 0, 0, txt_bg_w.Text.ToInt(), txt_bg_h.Text.ToInt());
}
3、调用打印
StandardPrintController spc = new StandardPrintController();
printDocument1.PrintController = spc;
printDocument1.Print();5、GDI中文字垂直排版
Bitmap ob = new Bitmap(500, 500);
Graphics g = Graphics.FromImage(ob);
g.Clear(Color.White);
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.CompositingQuality = CompositingQuality.HighQuality;
g.SmoothingMode = SmoothingMode.HighQuality;
//画刷颜色
SolidBrush txtBrush = new SolidBrush(ColorTranslator.FromHtml("#000000"));
//格式居中
StringFormat txtFromat = new StringFormat();
txtFromat.Alignment = StringAlignment.Center;
string remark = txt_top_ramrk.Text;
if (remark.Length > 10)
{
remark = remark.Substring(0, 10);
}
g.RotateTransform(270);
g.DrawString("垂直显示的文字", new Font("微软雅黑", 9), txtBrush, new Point(-55, 0), txtFromat);
g?.Dispose();
ob.Save(@"imgs/img.jpg",ImageFormat.Jpeg);
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