VB.NET

Example: Http.DownloadAppend method

Demonstrates the DownloadAppend method. VB.NET

Dim success As Boolean = False

success = False

Dim targetPath As String = "c:/temp/qa_output/download.txt"

Dim http As New Chilkat.Http
http.KeepResponseBody = True

' Assume the target file in the local filesystem does not yet exist.
success = http.DownloadAppend("https://chilkatsoft.com/testData/helloWorld.txt",targetPath)
Dim statusCode As Integer = http.LastStatus
If (statusCode = 0) Then
    ' Unable to either send the request or get the response.
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


' Should be 200.
Debug.WriteLine("Response status code: " & statusCode)

' Examine the contents of the file.
Dim sb As New Chilkat.StringBuilder
sb.LoadFile(targetPath,"utf-8")
Debug.WriteLine(sb.GetAsString())

' Output: 
' Response status code: 200
' Hello World!

' Download another text file and append to the target file.
success = http.DownloadAppend("https://chilkatsoft.com/testData/this_is_a_test.txt",targetPath)
statusCode = http.LastStatus
If (statusCode = 0) Then
    ' Unable to either send the request or get the response.
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


' Should be 200.
Debug.WriteLine("Response status code: " & statusCode)

' Examine the contents of the file.
sb.LoadFile(targetPath,"utf-8")
Debug.WriteLine(sb.GetAsString())

' Output:
' Response status code: 200
' Hello World!This is a Test.

' Delete the local target file.
Dim fac As New Chilkat.FileAccess
fac.FileDelete(targetPath)

' Try to download a file that does not exist:
success = http.DownloadAppend("https://chilkatsoft.com/testData/does_not_exist.txt",targetPath)
statusCode = http.LastStatus
If (statusCode = 0) Then
    ' Unable to either send the request or get the response.
    Debug.WriteLine(http.LastErrorText)
Else
    ' We got a response, and we already know it wasn't a 200 success response.
    ' It should be a 404 not found.
    Debug.WriteLine("Response status code: " & statusCode)
    ' Examine the response body.
    Debug.WriteLine("Response body:")
    Debug.WriteLine(http.LastResponseBody)
End If