使用VBA将图片上传至file.io（HTTP Post）

Question

使用VBA将图片上传至file.io（HTTP Post）

6

我正在尝试使用Excel中的VBA通过https://file.io上传文件，使用他们的Api（https://www.file.io/#one，见下文）。

我找到了这个线程如何上传文件到file.io并获取链接，但是我不知道如何将其准确地从C#转换为VBA。

File.io上的语法为：

$ curl -F "file=@test.txt" https://file.io
{"success":true,"key":"2ojE41","link":"https://file.io/2ojE41","expiry":"14 days"}
$ curl https://file.io/2ojE41 
This is a test
$ curl https://file.io/2ojE41
{"success":false,"error":404,"message":"Not Found"}

我的当前代码如下：

Set objhttp = CreateObject("MSXML2.ServerXMLHTTP")
URL = "https://file.io"
objhttp.Open "post", URL, False
objhttp.setRequestHeader "Content-type", "application/json" 
objhttp.Send ("file=@C:/Users/me/Downloads/image.jpg")
Debug.Print objhttp.responsetext

我的响应文本是：

{"success":false,"error":400,"message":"Trouble uploading file"}

我甚至不确定路径中的“@”是否正确，或者通常使用标准文件夹等。非常感谢！感谢您的所有帮助。

- Nicola

2

欢迎！好问题。我现在没有时间研究，但期待看到答案。同时，也许这个答案有用。或者这个链接也可能有帮助... - ashleedawg

1个回答

网页内容由stack overflow 提供, 点击上面的

可以查看英文原文，
原文链接

- Santosh · Accepted Answer

使用XmlHttp VBA发布multipart/form-data的步骤

使用Chrome/Firefox/Fiddler观察HTTP请求。
首先手动上传文件，并查看浏览器发送的所有请求和响应（特别是具有状态码200的xhr，文档请求）。
将cookie、参数传递到POST请求中。

在这种情况下，我使用了Chrome浏览器，下面的图片显示了浏览器在请求中发送的参数。

 Sub UploadFilesUsingVBA()
     'this proc will upload below files to https://file.io/
          '  png, jpg, txt

        Dim fileFullPath As String
        fileFullPath = "C:\Users\santosh\Desktop\abcd.txt"

        POST_multipart_form_data fileFullPath
    End Sub

文件上传成功后的确认信息

Private Function GetGUID() As String
    ' Generate uuid version 4 using VBA
    GetGUID = WorksheetFunction.Concat(WorksheetFunction.Dec2Hex(WorksheetFunction.RandBetween(0, 4294967295#), 8), "-", WorksheetFunction.Dec2Hex(WorksheetFunction.RandBetween(0, 65535), 4), "-", WorksheetFunction.Dec2Hex(WorksheetFunction.RandBetween(16384, 20479), 4), "-", WorksheetFunction.Dec2Hex(WorksheetFunction.RandBetween(32768, 49151), 4), "-", WorksheetFunction.Dec2Hex(WorksheetFunction.RandBetween(0, 65535), 4), WorksheetFunction.Dec2Hex(WorksheetFunction.RandBetween(0, 4294967295#), 8))

End Function

Private Function GetFileSize(fileFullPath As String) As Long

    Dim lngFSize As Long, lngDSize As Long
    Dim oFO As Object, OFS As Object

    lngFSize = 0
    Set OFS = CreateObject("Scripting.FileSystemObject")

    If OFS.FileExists(fileFullPath) Then
        Set oFO = OFS.getFile(fileFullPath)
        GetFileSize = oFO.Size
    Else
        GetFileSize = 0
    End If

    Set oFO = Nothing
    Set OFS = Nothing
End Function



Private Function ReadBinary(strFilePath As String)
    Dim ado As Object, bytFile
    Set ado = CreateObject("ADODB.Stream")
    ado.Type = 1
    ado.Open
    ado.LoadFromFile strFilePath
    bytFile = ado.Read
    ado.Close

    ReadBinary = bytFile

    Set ado = Nothing
End Function


Private Function toArray(str)
    Dim ado As Object
     Set ado = CreateObject("ADODB.Stream")
     ado.Type = 2
     ado.Charset = "_autodetect"
     ado.Open
     ado.WriteText (str)
     ado.Position = 0
     ado.Type = 1
     toArray = ado.Read()
     Set ado = Nothing
End Function


Sub POST_multipart_form_data(filePath As String)

    Dim oFields As Object, ado As Object
    Dim sBoundary As String, sPayLoad As String, GUID As String
    Dim fileType As String, fileExtn As String, fileName As String
    Dim sName As Variant

    fileName = Right(filePath, Len(filePath) - InStrRev(filePath, "\"))
    fileExtn = Right(filePath, Len(fileName) - InStrRev(fileName, "."))

    Select Case fileExtn
     Case "png"
        fileType = "image/png"
     Case "jpg"
        fileType = "image/jpeg"
     Case "txt"
        fileType = "text/plain"
    End Select

    Set oFields = CreateObject("Scripting.Dictionary")
    With oFields
        .Add "qquuid", GetGUID
        .Add "qqtotalfilesize", GetFileSize(filePath)
    End With

    sBoundary = String(27, "-") & "7e234f1f1d0654"
    sPayLoad = ""
    For Each sName In oFields
        sPayLoad = sPayLoad & "--" & sBoundary & vbCrLf
        sPayLoad = sPayLoad & "Content-Disposition: form-data; name=""" & sName & """" & vbCrLf & vbCrLf
        sPayLoad = sPayLoad & oFields(sName) & vbCrLf
    Next

    sPayLoad = sPayLoad & "--" & sBoundary & vbCrLf
    sPayLoad = sPayLoad & "Content-Disposition: form-data; name=""file""; " & "filename=""" & fileName & """" & vbCrLf
    sPayLoad = sPayLoad & "Content-Type: " & fileType & vbCrLf & vbCrLf & vbCrLf & vbCrLf & vbCrLf



     sPayLoad = sPayLoad & "--" & sBoundary & "--"


      Set ado = CreateObject("ADODB.Stream")
      ado.Type = 1
      ado.Open
      ado.Write toArray(sPayLoad)
      ado.Write ReadBinary(filePath)
      ado.Position = 0

    With CreateObject("MSXML2.ServerXMLHTTP")
        .Open "POST", "https://file.io", False
        .SetRequestHeader "Content-Type", "multipart/form-data; boundary=" & sBoundary
        .Send (ado.Read())
        MsgBox .responseText
    End With

End Sub

帮助回答这个问题的链接
1. https://dev59.com/TqDia4cB1Zd3GeqPEn88#43266809
2. https://wqweto.wordpress.com/