[英]existing file in subfolder google drive
我想用vb.net验证文件在Google驱动器中是否存在,文件路径在子文件夹中。 我创建了existfile方法,在其中列出子文件夹和列表文件并使用测试,但始终countfile = 0。 这是existfile方法代码
Public Function existfile(v As String) As String
Dim page As String = ""
Dim req = Service.Files.List()
req.Q = "mimeType = 'application/vnd.google-apps.file' and trashed = false "
req.Spaces = "drive"
req.Fields = "nextPageToken, items(id, title)"
req.PageToken = page
Dim result = req.Execute()
' sous doc
Dim ref = Service.Files.List()
ref.Q = "mimeType = 'application/vnd.google-apps.folder' and trashed = false "
Dim fo = ref.Execute()
'récuprer la reference (ID) du dossier existant , sinon la fonction retourne false en cas d'inexistance'
Const a As String = "false"
For Each listf In fo.Items
For Each test In result.Items
If (test.Title = v) Then
Return (test.Id)
End If
Next
Next
Return (a)
End Function
每个第一个用于列表文件夹,第二个用于列表文件已经存在,但result.item始终为0
文件路径在subfolder下,而子文件夹在bigfolder下
您可能需要检查此.NET快速入门 ,该文档使用Files.List
在Google云端硬盘上列出文件。
// Define parameters of request.
FilesResource.ListRequest listRequest = service.Files.List();
listRequest.PageSize = 10;
listRequest.Fields = "nextPageToken, files(id, name)";
// List files.
IList<Google.Apis.Drive.v3.Data.File> files = listRequest.Execute()
.Files;
Console.WriteLine("Files:");
if (files != null && files.Count > 0)
{
foreach (var file in files)
{
Console.WriteLine("{0} ({1})", file.Name, file.Id);
}
}
else
{
Console.WriteLine("No files found.");
}
Console.Read();
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