HTML のフォーム データをポストバックするインターネット クライアント アプリケーションを記述する場合は、Wininet API または Visual Basic のインターネット転送コントロールを使用して ASP ページは投稿では、次の HTTP ヘッダーを追加するのには、必要に応じて要求します。
Content-Type: application/x-www-form-urlencoded
このヘッダーがポストされるデータに基づいてエンコードされていることを示しますHTML の仕様 (RFC 1866) 内のルール。ASP を取得されませんが、このヘッダーは、POST 要求に存在しない場合の HTML フォームの変数。
Visual Basic の例を次に示します、カスタム HTTP ヘッダーを追加する方法を示しますPOST 要求は Wininet API またはインターネット転送コントロールを使用するには(SP2)。インターネット転送コントロールの必要があることに注意してください。最小の Visual Basic 5.0 Service Pack 2 または Visual Studio サービス パック 2ポストを実装します。元のコントロールが正しく、バグをポストできません。Commandbutton1 というイベントには、次のコード フラグメント例は、Wininet API を使用します。コードで、CommandButton2 がクリックしてインターネット トランスファー コントロール (SP2) のイベントを使用します。
Private Declare Function InternetOpen Lib "wininet.dll" _
Alias "InternetOpenA" _
(ByVal lpszCallerName As String, _
ByVal dwAccessType As Long, _
ByVal lpszProxyName As String, _
ByVal lpszProxyBypass As String, _
ByVal dwFlags As Long) As Long
Private Declare Function InternetConnect Lib "wininet.dll" _
Alias "InternetConnectA" _
(ByVal hInternetSession As Long, _
ByVal lpszServerName As String, _
ByVal nProxyPort As Integer, _
ByVal lpszUsername As String, _
ByVal lpszPassword As String, _
ByVal dwService As Long, _
ByVal dwFlags As Long, _
ByVal dwContext As Long) As Long
Private Declare Function InternetReadFile Lib "wininet.dll" _
(ByVal hFile As Long, _
ByVal sBuffer As String, _
ByVal lNumBytesToRead As Long, _
lNumberOfBytesRead As Long) As Integer
Private Declare Function HttpOpenRequest Lib "wininet.dll" _
Alias "HttpOpenRequestA" _
(ByVal hInternetSession As Long, _
ByVal lpszVerb As String, _
ByVal lpszObjectName As String, _
ByVal lpszVersion As String, _
ByVal lpszReferer As String, _
ByVal lpszAcceptTypes As Long, _
ByVal dwFlags As Long, _
ByVal dwContext As Long) As Long
Private Declare Function HttpSendRequest Lib "wininet.dll" _
Alias "HttpSendRequestA" _
(ByVal hHttpRequest As Long, _
ByVal sHeaders As String, _
ByVal lHeadersLength As Long, _
ByVal sOptional As String, _
ByVal lOptionalLength As Long) As Boolean
Private Declare Function InternetCloseHandle Lib "wininet.dll" _
(ByVal hInternetHandle As Long) As Boolean
Private Declare Function HttpAddRequestHeaders Lib "wininet.dll" _
Alias "HttpAddRequestHeadersA" _
(ByVal hHttpRequest As Long, _
ByVal sHeaders As String, _
ByVal lHeadersLength As Long, _
ByVal lModifiers As Long) As Integer
Private Sub Command1_Click()
Dim hInternetOpen As Long
Dim hInternetConnect As Long
Dim hHttpOpenRequest As Long
Dim bRet As Boolean
hInternetOpen = 0
hInternetConnect = 0
hHttpOpenRequest = 0
'Use registry access settings.
Const INTERNET_OPEN_TYPE_PRECONFIG = 0
hInternetOpen = InternetOpen("http generic", _
INTERNET_OPEN_TYPE_PRECONFIG, _
vbNullString, _
vbNullString, _
0)
If hInternetOpen <> 0 Then
'Type of service to access.
Const INTERNET_SERVICE_HTTP = 3
Const INTERNET_DEFAULT_HTTP_PORT = 80
'Change the server to your server name
hInternetConnect = InternetConnect(hInternetOpen, _
"yourserver", _
INTERNET_DEFAULT_HTTP_PORT, _
vbNullString, _
"HTTP/1.0", _
INTERNET_SERVICE_HTTP, _
0, _
0)
If hInternetConnect <> 0 Then
'Brings the data across the wire even if it locally cached.
Const INTERNET_FLAG_RELOAD = &H80000000
hHttpOpenRequest = HttpOpenRequest(hInternetConnect, _
"POST", _
"/scripts/testpost.asp", _
"HTTP/1.0", _
vbNullString, _
0, _
INTERNET_FLAG_RELOAD, _
0)
If hHttpOpenRequest <> 0 Then
Dim sHeader As String
Const HTTP_ADDREQ_FLAG_ADD = &H20000000
Const HTTP_ADDREQ_FLAG_REPLACE = &H80000000
sHeader = "Content-Type: application/x-www-form-urlencoded" _
& vbCrLf
bRet = HttpAddRequestHeaders(hHttpOpenRequest, _
sHeader, Len(sHeader), HTTP_ADDREQ_FLAG_REPLACE _
Or HTTP_ADDREQ_FLAG_ADD)
Dim lpszPostData As String
Dim lPostDataLen As Long
lpszPostData = "lname=Doe&fname=John"
lPostDataLen = Len(lpszPostData)
bRet = HttpSendRequest(hHttpOpenRequest, _
vbNullString, _
0, _
lpszPostData, _
lPostDataLen)
Dim bDoLoop As Boolean
Dim sReadBuffer As String * 2048
Dim lNumberOfBytesRead As Long
Dim sBuffer As String
bDoLoop = True
While bDoLoop
sReadBuffer = vbNullString
bDoLoop = InternetReadFile(hHttpOpenRequest, _
sReadBuffer, Len(sReadBuffer), lNumberOfBytesRead)
sBuffer = sBuffer & _
Left(sReadBuffer, lNumberOfBytesRead)
If Not CBool(lNumberOfBytesRead) Then bDoLoop = False
Wend
MsgBox sBuffer
bRet = InternetCloseHandle(hHttpOpenRequest)
End If
bRet = InternetCloseHandle(hInternetConnect)
End If
bRet = InternetCloseHandle(hInternetOpen)
End If
End Sub
Private Sub Command2_Click()
Dim strURL As String, strFormData As String
'Change the server to your server name
strURL = "http://yourserver/scripts/testpost.asp"
strFormData = "lname=Doe&fname=John"
Inet1.Execute strURL, "Post", strFormData, _
"Content-Type: application/x-www-form-urlencoded"
End Sub
Private Sub Inet1_StateChanged(ByVal State As Integer)
Dim vtData As Variant ' Data variable.
Select Case State
' ... Other cases not shown.
Case icError ' 11
' In case of error, return ResponseCode and
' ResponseInfo.
vtData = Inet1.ResponseCode & ":" & _
Inet1.ResponseInfo
Case icResponseCompleted ' 12
Dim strData As String: strData = ""
Dim bDone As Boolean: bDone = False
' Get first chunk.
vtData = Inet1.GetChunk(1024, icString)
DoEvents
Do While Not bDone
strData = strData & vtData
' Get next chunk.
vtData = Inet1.GetChunk(1024, icString)
DoEvents
If Len(vtData) = 0 Then
bDone = True
End If
Loop
MsgBox strData
End Select
End Sub
Private Sub Form_Load()
Inet1.Cancel
End Sub
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