C# 使用 PrintDocument 打印图像。如何调整图像以适合纸张大小
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Printing image with PrintDocument. how to adjust the image to fit paper size
提问by Happy
In C#, I am trying to print an image using PrintDocument class with the below code. The image is of size 1200 px width and 1800 px height. I am trying to print this image in a 4*6 paper using a small zeebra printer. But the program is printing only 4*6 are of the big image. that means it is not adjusting the image to the paper size !
在 C# 中，我尝试使用 PrintDocument 类和以下代码打印图像。图像大小为 1200 px 宽和 1800 px 高。我正在尝试使用小型 zeebra 打印机在 4*6 纸上打印此图像。但该程序仅打印 4*6 的大图像。这意味着它没有将图像调整为纸张尺寸！
PrintDocument pd = new PrintDocument();
pd.PrintPage += (sender, args) =>
{
Image i = Image.FromFile("C://tesimage.PNG");
Point p = new Point(100, 100);
args.Graphics.DrawImage(i, 10, 10, i.Width, i.Height);
};
pd.Print();
When i print the same image using Window Print (right click and select print, it is scaling automatically to paper size and printing correctly. that means everything came in 4*6 paper.) How do i do the same in my C# program ?
当我使用 Window Print 打印相同的图像时（右键单击并选择打印，它会自动缩放到纸张大小并正确打印。这意味着所有内容都是 4*6 纸张。）我如何在我的 C# 程序中执行相同的操作？
回答by BBoy
The parameters that you are passing into the DrawImage method should be the size you want the image on the paper rather than the size of the image itself, the DrawImage command will then take care of the scaling for you. Probably the easiest way is to use the following override of the DrawImage command.
您传递给 DrawImage 方法的参数应该是您想要在纸上图像的大小而不是图像本身的大小，然后 DrawImage 命令将为您处理缩放。可能最简单的方法是使用 DrawImage 命令的以下覆盖。
args.Graphics.DrawImage(i, args.MarginBounds);
Note: This will skew the image if the proportions of the image are not the same as the rectangle. Some simple math on the size of the image and paper size will allow you to create a new rectangle that fits in the bounds of the paper without skewing the image.
注意：如果图像的比例与矩形不同，这将使图像倾斜。对图像大小和纸张大小进行一些简单的数学运算，您可以创建一个适合纸张边界的新矩形，而不会使图像倾斜。
回答by psyklopz
Not to trample on BBoy's already decent answer, but I've done the code that maintains aspect ratio. I took his suggestion, so he should get partial credit here!
不要践踏 BBoy 已经不错的答案，但我已经完成了保持纵横比的代码。我接受了他的建议，所以他应该在这里得到部分信任！
PrintDocument pd = new PrintDocument();
pd.DefaultPageSettings.PrinterSettings.PrinterName = "Printer Name";
pd.DefaultPageSettings.Landscape = true; //or false!
pd.PrintPage += (sender, args) =>
{
Image i = Image.FromFile(@"C:\...\...\image.jpg");
Rectangle m = args.MarginBounds;
if ((double)i.Width / (double)i.Height > (double)m.Width / (double)m.Height) // image is wider
{
m.Height = (int)((double)i.Height / (double)i.Width * (double)m.Width);
}
else
{
m.Width = (int)((double)i.Width / (double)i.Height * (double)m.Height);
}
args.Graphics.DrawImage(i, m);
};
pd.Print();
回答by Anas Naguib
You can use my code here
你可以在这里使用我的代码
//Print Button Event Handeler
private void btnPrint_Click(object sender, EventArgs e)
{
PrintDocument pd = new PrintDocument();
pd.PrintPage += PrintPage;
//here to select the printer attached to user PC
PrintDialog printDialog1 = new PrintDialog();
printDialog1.Document = pd;
DialogResult result = printDialog1.ShowDialog();
if (result == DialogResult.OK)
{
pd.Print();//this will trigger the Print Event handeler PrintPage
}
}
//The Print Event handeler
private void PrintPage(object o, PrintPageEventArgs e)
{
try
{
if (File.Exists(this.ImagePath))
{
//Load the image from the file
System.Drawing.Image img = System.Drawing.Image.FromFile(@"C:\myimage.jpg");
//Adjust the size of the image to the page to print the full image without loosing any part of it
Rectangle m = e.MarginBounds;
if ((double)img.Width / (double)img.Height > (double)m.Width / (double)m.Height) // image is wider
{
m.Height = (int)((double)img.Height / (double)img.Width * (double)m.Width);
}
else
{
m.Width = (int)((double)img.Width / (double)img.Height * (double)m.Height);
}
e.Graphics.DrawImage(img, m);
}
}
catch (Exception)
{
}
}
回答by KhanSahib
Answer:
回答：
public void Print(string FileName)
{
StringBuilder logMessage = new StringBuilder();
logMessage.AppendLine(string.Format(CultureInfo.InvariantCulture, "-------------------[ START - {0} - {1} -------------------]", MethodBase.GetCurrentMethod(), DateTime.Now.ToShortDateString()));
logMessage.AppendLine(string.Format(CultureInfo.InvariantCulture, "Parameter: 1: [Name - {0}, Value - {1}", "None]", Convert.ToString("")));
try
{
if (string.IsNullOrWhiteSpace(FileName)) return; // Prevents execution of below statements if filename is not selected.
PrintDocument pd = new PrintDocument();
//Disable the printing document pop-up dialog shown during printing.
PrintController printController = new StandardPrintController();
pd.PrintController = printController;
//For testing only: Hardcoded set paper size to particular paper.
//pd.PrinterSettings.DefaultPageSettings.PaperSize = new PaperSize("Custom 6x4", 720, 478);
//pd.DefaultPageSettings.PaperSize = new PaperSize("Custom 6x4", 720, 478);
pd.DefaultPageSettings.Margins = new Margins(0, 0, 0, 0);
pd.PrinterSettings.DefaultPageSettings.Margins = new Margins(0, 0, 0, 0);
pd.PrintPage += (sndr, args) =>
{
System.Drawing.Image i = System.Drawing.Image.FromFile(FileName);
//Adjust the size of the image to the page to print the full image without loosing any part of the image.
System.Drawing.Rectangle m = args.MarginBounds;
//Logic below maintains Aspect Ratio.
if ((double)i.Width / (double)i.Height > (double)m.Width / (double)m.Height) // image is wider
{
m.Height = (int)((double)i.Height / (double)i.Width * (double)m.Width);
}
else
{
m.Width = (int)((double)i.Width / (double)i.Height * (double)m.Height);
}
//Calculating optimal orientation.
pd.DefaultPageSettings.Landscape = m.Width > m.Height;
//Putting image in center of page.
m.Y = (int)((((System.Drawing.Printing.PrintDocument)(sndr)).DefaultPageSettings.PaperSize.Height - m.Height) / 2);
m.X = (int)((((System.Drawing.Printing.PrintDocument)(sndr)).DefaultPageSettings.PaperSize.Width - m.Width) / 2);
args.Graphics.DrawImage(i, m);
};
pd.Print();
}
catch (Exception ex)
{
log.ErrorFormat("Error : {0}\n By : {1}-{2}", ex.ToString(), this.GetType(), MethodBase.GetCurrentMethod().Name);
}
finally
{
logMessage.AppendLine(string.Format(CultureInfo.InvariantCulture, "-------------------[ END - {0} - {1} -------------------]", MethodBase.GetCurrentMethod().Name, DateTime.Now.ToShortDateString()));
log.Info(logMessage.ToString());
}
}
回答by TonyM
The solution provided by BBoy works fine. But in my case I had to use
BBoy 提供的解决方案工作正常。但就我而言，我不得不使用
e.Graphics.DrawImage(memoryImage, e.PageBounds);
This will print only the form. When I use MarginBounds it prints the entire screen even if the form is smaller than the monitor screen. PageBounds solved that issue. Thanks to BBoy!
这将仅打印表单。当我使用 MarginBounds 时，即使表单小于监视器屏幕，它也会打印整个屏幕。PageBounds 解决了这个问题。感谢 BBoy！
回答by user1807576
Agree with TonyM and BBoy - this is the correct answer for original 4*6 printing of label. (args.PageBounds). This worked for me for printing Endicia API service shipping Labels.
同意 TonyM 和 BBoy - 这是原始 4*6 打印标签的正确答案。(args.PageBounds)。这对我打印 Endicia API 服务运输标签有用。
private void SubmitResponseToPrinter(ILabelRequestResponse response)
{
PrintDocument pd = new PrintDocument();
pd.PrintPage += (sender, args) =>
{
Image i = Image.FromFile(response.Labels[0].FullPathFileName.Trim());
args.Graphics.DrawImage(i, args.PageBounds);
};
pd.Print();
}
