ES400：保存一张图像后 CameraCaptureDialog 错误

Question

我在 ES400 中使用 CameraCaptureDialog 类时遇到错误，在捕获第二个图像时，它显示“无法找到图像”。但同样的代码在 MC35 中运行良好。

  Dim app_path As String
        Dim ccd As New CameraCaptureDialog
        Dim count As Integer
        count = TransImagelst.Images.Count
        Try

            ccd.Owner = Me
            ccd.DefaultFileName = "Image" & count.ToString & ".jpg"
            ccd.Mode = CameraCaptureMode.Still
            ccd.StillQuality = CameraCaptureStillQuality.Low
            ccd.Resolution = New Size(0, 0)
            ccd.Title = "Image"
            ccd.InitialDirectory = DataBase_Path & "\" & Region & "\Image"
            ccd.ShowDialog()


            'add files to image directory.
            If Not Directory.Exists(DataBase_Path & "\" & Region & "\Image") Then Directory.CreateDirectory(DataBase_Path & "\" & Region & "\Image")

            If ccd.FileName  String.Empty Then
                TransImagelst.ImageSize = New Drawing.Size(55, 55)
                TransImagelst.Images.Add(New Bitmap(ccd.FileName))
                TransImagelstv.View = View.LargeIcon
                TransImagelstv.LargeImageList = TransImagelst
                Dim lv As New ListViewItem("Image" & TransImagelst.Images.Count - 1)
                TransImagelstv.Items.Add(lv)
                lv.ImageIndex = TransImagelst.Images.Count - 1
            End If

请帮帮我。

Answer 1

我也有同样的问题。尽管 ES400 功能丰富，但它无法与 Cameracapturedialog 配合使用。它甚至不支持 Motorla EMDK SDK 中的成像库。这真是令人费解。
EMDK 程序员指南中有一个 ES400 编程条目，其中指出 - 您必须使用 Microsoft 的 DirectShow 来捕获图像。我尝试了这种方法，但我只能获得 VGA 分辨率，这对于我的目的来说是垃圾。如果这对您来说足够了，您可以查看 http://alexmogurenko.com/blog/directshownetcf/< /a>.在这一点上我对ES400非常失望。
我最终使用了一个有点垃圾的简单解决方案，但至少它有效（参见下面的概述，祝你好运）。

using (Process proc = new Process())
{
    //This will open the internal camera application.
    proc.StartInfo = new System.Diagnostics.ProcessStartInfo(@"\Windows\Camera.lnk", string.Empty);
    if (proc.Start() == false)
    {
      Messagebox.(this did not work blablabla)
        return; 
    }
}
//The camera app has now focus, in the meantime, we wait with a new messagebox…
Messagebox.Show(“Ok,Cancel” to open picturedialog)
if (cancel)
    return;
string _filename = string.Empty; 
using (SelectPictureDialog _spd = new SelectPictureDialog())
{
    _spd.Owner = this;
    _spd.CameraAccess = false;
    _spd.LockDirectory = false;
    _spd.SortOrder = SortOrder.DateDescending;
    _spd.Title = "Select picture from camera";
    if (_spd.ShowDialog() == DialogResult.OK)
    {
        _filename = _spd.FileName;
    }
    else //No picture selected
        return;
}

//Handle image.. 
//Delete image from folder?