[英]How do I take a bitmap image and save as a JPEG image file on a Windows Phone 7 device?
[英]How to save a bitmap image as JPEG
问题是文件没有保存为 JPEG。 只是一个普通的文件。
到目前为止,这是我的代码:
private void btnSave_Click(object sender, EventArgs e)
{
saveDialog.FileName = txtModelName.Text;
if (saveDialog.ShowDialog() == DialogResult.OK)
{
Bitmap bmp = new Bitmap(pnlDraw.Width, pnlDraw.Height);
pnlDraw.DrawToBitmap(bmp, new Rectangle(0, 0,
pnlDraw.Width, pnlDraw.Height));
bmp.Save(saveDialog.FileName, System.Drawing.Imaging.ImageFormat.Jpeg);
}
}
如何在保存之前检查文件名是否具有.jpg
扩展名?
您还可以将saveDialog
更改为仅允许用户选择.jpg
图像。
private void btnSave_Click(object sender, EventArgs e)
{
saveDialog.FileName = txtModelName.Text;
saveDialog.DefaultExt = "jpg";
saveDialog.Filter = "JPG images (*.jpg)|*.jpg";
if (saveDialog.ShowDialog() == DialogResult.OK)
{
Bitmap bmp = new Bitmap(pnlDraw.Width, pnlDraw.Height);
pnlDraw.DrawToBitmap(bmp, new Rectangle(0, 0,
pnlDraw.Width, pnlDraw.Height));
var fileName = saveDialog.FileName;
if(!System.IO.Path.HasExtension(fileName) || System.IO.Path.GetExtension(fileName) != "jpg")
fileName = fileName + ".jpg";
bmp.Save(fileName, System.Drawing.Imaging.ImageFormat.Jpeg);
}
}
int width;
int height;
int stride;
int x;
int y;
string filename;
Bitmap bitmap = new Bitmap(width,height,stride,PixelFormat.Format32bppArgb,new IntPtr());
//then set the pixel;
bitmap.SetPixel(x,y,Colors.Black);
bitmap.Save(filename);
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