使用 VB.NET 发送多播推送通知

Posted 2023-02-24

【中文标题】使用 VB.NET 发送多播推送通知

【英文标题】：Send multicast push notification with VB.NET

【发布时间】：2014-11-14 17:13:20

【问题描述】：

我使用this 代码发送推送通知，效果很好。现在我正在尝试向多个设备发送通知，但我无法做到，我收到“400 Bad Request Error”。

这是我修改后的代码：

Shared Function sendPush(ByVal value As String) As String

        Dim toret As String = ""


        Dim regid As String = "[""XXXXXX"",""ZZZZZZ""]"

        Dim applicationID = "YYYYYYY"
        Dim SENDER_ID = "SSSSSSS"

        Dim tRequest As WebRequest
        tRequest = WebRequest.Create("https://android.googleapis.com/gcm/send")
        tRequest.Method = "post"
        tRequest.ContentType = " application/json"
        tRequest.Headers.Add(String.Format("Authorization: key=0", applicationID))

        tRequest.Headers.Add(String.Format("Sender: id=0", SENDER_ID))

        Dim postData As String = """collapse_key"":""score_update"",""time_to_live"":108,""delay_while_idle"":1,""data"":""message"":""" & Convert.ToString(value) & """,""time"":""" & System.DateTime.Now.ToString() & """,""registration_ids"":" & regid & ""
        Console.WriteLine(postData)
        Dim byteArray As [Byte]() = Encoding.UTF8.GetBytes(postData)
        tRequest.ContentLength = byteArray.Length

        Dim dataStream As Stream = tRequest.GetRequestStream()
        dataStream.Write(byteArray, 0, byteArray.Length)
        dataStream.Close()

        Dim tResponse As WebResponse = tRequest.GetResponse()

        dataStream = tResponse.GetResponseStream()

        Dim tReader As New StreamReader(dataStream)

        Dim sResponseFromServer As [String] = tReader.ReadToEnd()

        toret = sResponseFromServer
        tReader.Close()
        dataStream.Close()
        tResponse.Close()

        Return toret
    End Function

【参考方案1】：

我解决了这个问题。

问题出在参数中：""delay_while_idle"":1

此参数仅接受 JSON 布尔值，因此必须为：""delay_while_idle"":true 或 ""delay_while_idle"":false。我决定删除它，因为默认值为 false，这正是我想要的。

Here 是完整的参数列表。

我在这里发布了未来复制粘贴的工作代码：

Shared Function sendPush(ByVal value As String) As String

    Dim toret As String = ""

    'Change these values
    Dim regid As String = "[""XXXXXX"",""ZZZZZZ""]"
    Dim applicationID = "YYYYYYY"
    Dim SENDER_ID = "SSSSSSS"

    Dim tRequest As WebRequest
    tRequest = WebRequest.Create("https://android.googleapis.com/gcm/send")
    tRequest.Method = "post"
    tRequest.ContentType = " application/json"
    tRequest.Headers.Add(String.Format("Authorization: key=0", applicationID))

    tRequest.Headers.Add(String.Format("Sender: id=0", SENDER_ID))

    Dim postData As String = """collapse_key"":""score_update"",""time_to_live"":108,""data"":""message"":""" & Convert.ToString(value) & """,""time"":""" & System.DateTime.Now.ToString() & """,""registration_ids"":" & regid & ""
    Console.WriteLine(postData)
    Dim byteArray As [Byte]() = Encoding.UTF8.GetBytes(postData)
    tRequest.ContentLength = byteArray.Length

    Dim dataStream As Stream = tRequest.GetRequestStream()
    dataStream.Write(byteArray, 0, byteArray.Length)
    dataStream.Close()

    Dim tResponse As WebResponse = tRequest.GetResponse()

    dataStream = tResponse.GetResponseStream()

    Dim tReader As New StreamReader(dataStream)

    Dim sResponseFromServer As [String] = tReader.ReadToEnd()

    toret = sResponseFromServer
    tReader.Close()
    dataStream.Close()
    tResponse.Close()

    Return toret
End Function