我有一个程序将使用网络摄像头使用此源代码捕获图像... http://www.thaiio.com/prog-cgi/vbnetwebcam.html 这是从剪贴板获取图像并转换的子它到位图...
Private Sub btnSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSave.Click
Dim data As IDataObject
Dim bmap As Bitmap
'
' Copy image to clipboard
'
SendMessage(hHwnd, WM_CAP_EDIT_COPY, 0, 0)
'
' Get image from clipboard and convert it to a bitmap
'
data = Clipboard.GetDataObject()
If data.GetDataPresent(GetType(System.Drawing.Bitmap)) Then
bmap = CType(data.GetData(GetType(System.Drawing.Bitmap)), Bitmap)
picCapture.Image = bmap
ClosePreviewWindow()
btnSave.Enabled = False
btnStop.Enabled = False
btnStart.Enabled = True
btnInfo.Enabled = False
Trace.Assert(Not (bmap Is Nothing))
sfdImage.Filter = ("Jpeg|*.jpg")
If sfdImage.ShowDialog = DialogResult.OK Then
bmap.Save(sfdImage.FileName, Imaging.ImageFormat.Jpeg)
End If
End If
End Sub
尝试将其保存在 Memorystream 上时出现错误“值不能为空。参数名称:编码器” ,可能是因为我应该先获取原始格式。关于我该怎么做的任何想法?