private void SaveImage_Click(object sender, EventArgs e) { try { saveFileDialog.Filter = "图片(*.bmp)|*.bmp"; if (saveFileDialog.ShowDialog() == DialogResult.OK) { MyNegImage.Save(saveFileDialog.FileName); MessageBox.Show("保存成功!"); } }啥意思
时间: 2024-02-10 22:34:29 浏览: 162
这是一个 C# 的 WinForms 代码段,用于实现保存图像的功能。其中,SaveImage_Click 是一个按钮的点击事件,当用户点击该按钮时,会弹出一个 saveFileDialog 对话框,用于选择保存的文件名和路径。如果用户确定保存,就会调用 MyNegImage.Save 方法,将图像保存到指定的文件中。最后,弹出一个消息框提示保存成功。其中,Filter 属性用于指定 saveFileDialog 对话框中文件类型的过滤器,这里只显示 bmp 格式的文件。如果用户选择其他格式的文件,将无法保存成功。
相关问题
使用c#把dxf转为bmp文件的完整代码
以下是使用C#将DXF文件转换为BMP文件的示例代码:
```csharp
using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;
using System.Windows.Forms;
using netDxf;
namespace DxfToBmpConverter
{
public partial class MainForm : Form
{
public MainForm()
{
InitializeComponent();
}
private void MainForm_Load(object sender, EventArgs e)
{
// Set default input and output file paths
inputFilePathTextBox.Text = Path.Combine(Application.StartupPath, "sample.dxf");
outputFilePathTextBox.Text = Path.Combine(Application.StartupPath, "sample.bmp");
}
private void browseInputFileButton_Click(object sender, EventArgs e)
{
// Show open file dialog and set selected file path as input file path
OpenFileDialog openFileDialog = new OpenFileDialog();
openFileDialog.Filter = "DXF Files (*.dxf)|*.dxf";
if (openFileDialog.ShowDialog() == DialogResult.OK)
{
inputFilePathTextBox.Text = openFileDialog.FileName;
}
}
private void browseOutputFileButton_Click(object sender, EventArgs e)
{
// Show save file dialog and set selected file path as output file path
SaveFileDialog saveFileDialog = new SaveFileDialog();
saveFileDialog.Filter = "BMP Files (*.bmp)|*.bmp";
if (saveFileDialog.ShowDialog() == DialogResult.OK)
{
outputFilePathTextBox.Text = saveFileDialog.FileName;
}
}
private void convertButton_Click(object sender, EventArgs e)
{
// Check if input file exists
if (!File.Exists(inputFilePathTextBox.Text))
{
MessageBox.Show("Input file does not exist!", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
// Load DXF file
DxfDocument dxfDocument = DxfDocument.Load(inputFilePathTextBox.Text);
// Calculate drawing bounds
double minX = 0, minY = 0, maxX = 0, maxY = 0;
foreach (DxfEntity entity in dxfDocument.Entities)
{
if (entity is DxfLwPolyline lwPolyline)
{
foreach (Vector2 vertex in lwPolyline.Vertexes)
{
if (vertex.X < minX) minX = vertex.X;
if (vertex.X > maxX) maxX = vertex.X;
if (vertex.Y < minY) minY = vertex.Y;
if (vertex.Y > maxY) maxY = vertex.Y;
}
}
else if (entity is DxfLine line)
{
if (line.StartPoint.X < minX) minX = line.StartPoint.X;
if (line.StartPoint.X > maxX) maxX = line.StartPoint.X;
if (line.StartPoint.Y < minY) minY = line.StartPoint.Y;
if (line.StartPoint.Y > maxY) maxY = line.StartPoint.Y;
if (line.EndPoint.X < minX) minX = line.EndPoint.X;
if (line.EndPoint.X > maxX) maxX = line.EndPoint.X;
if (line.EndPoint.Y < minY) minY = line.EndPoint.Y;
if (line.EndPoint.Y > maxY) maxY = line.EndPoint.Y;
}
// Add additional cases for other entity types as needed
}
// Calculate drawing scale and size
double drawingWidth = maxX - minX;
double drawingHeight = maxY - minY;
double drawingScale = Math.Max(drawingWidth, drawingHeight) / Math.Min(pictureBox.Width, pictureBox.Height);
int bmpWidth = (int)Math.Round(drawingWidth / drawingScale);
int bmpHeight = (int)Math.Round(drawingHeight / drawingScale);
// Create bitmap and graphics objects
Bitmap bmp = new Bitmap(bmpWidth, bmpHeight, PixelFormat.Format24bppRgb);
Graphics graphics = Graphics.FromImage(bmp);
graphics.SmoothingMode = SmoothingMode.AntiAlias;
graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
graphics.Clear(Color.White);
// Draw entities onto bitmap
foreach (DxfEntity entity in dxfDocument.Entities)
{
if (entity is DxfLwPolyline lwPolyline)
{
PointF[] points = new PointF[lwPolyline.Vertexes.Count];
for (int i = 0; i < lwPolyline.Vertexes.Count; i++)
{
points[i] = new PointF(
(float)((lwPolyline.Vertexes[i].X - minX) / drawingScale),
(float)((maxY - lwPolyline.Vertexes[i].Y) / drawingScale));
}
graphics.DrawLines(new Pen(Color.Black, lwPolyline.Thickness), points);
}
else if (entity is DxfLine line)
{
PointF startPoint = new PointF(
(float)((line.StartPoint.X - minX) / drawingScale),
(float)((maxY - line.StartPoint.Y) / drawingScale));
PointF endPoint = new PointF(
(float)((line.EndPoint.X - minX) / drawingScale),
(float)((maxY - line.EndPoint.Y) / drawingScale));
graphics.DrawLine(new Pen(Color.Black, line.Thickness), startPoint, endPoint);
}
// Add additional cases for other entity types as needed
}
// Save bitmap to output file
bmp.Save(outputFilePathTextBox.Text, ImageFormat.Bmp);
// Clean up resources
bmp.Dispose();
graphics.Dispose();
// Show success message
MessageBox.Show("Conversion successful!", "Success", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
}
```
请注意,这是一个简单的示例,可能不适用于所有情况。您可能需要根据您的需求进行更改和修改。
点击“地图输出”命令按钮时可以将axMapControl1中的地图以BMP格式输出,输出分辨率为300dpi。我想调出一个对话框,它可以让我选择输出的位置和名称
在某些软件或应用中,当你需要自定义地图输出的过程时,可能会提供用户交互的界面,以便让用户选择输出的具体位置和文件名。例如,在Visual Basic或类似环境中,你可以通过使用Windows Forms的DialogBox或InputBox函数来创建这样的对话框。
你可以编写一段代码,比如:
```vb
Private Sub btnOutput_Click(sender As Object, e As EventArgs) Handles btnOutput.Click
Dim saveFileDialog As New SaveFileDialog()
saveFileDialog.Filter = "BMP Image|*.bmp"
saveFileDialog.Title = "Save Map as BMP"
saveFileDialog.DefaultExt = ".bmp"
saveFileDialog.FileName = "map_" ' 这里可以加上当前时间或者其他默认前缀
If saveFileDialog.ShowDialog() = DialogResult.OK Then
Dim filePath As String = saveFileDialog.FileName
axMapControl1.Map.Save(filePath, System.Drawing.Imaging.ImageFormat.Bmp)
End If
End Sub
```
在这个例子中,`btnOutput_Click`事件处理程序打开了一个保存文件对话框,允许用户指定输出的路径和文件名(`.bmp`格式)。如果用户选择了文件并点击了"保存"按钮,地图就会按照用户的设置以300dpi的分辨率保存为BMP格式。
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