「インターネット」の編集履歴（バックアップ）一覧はこちら

「インターネット」(2010/01/31 (日) 04:40:13) の最新版変更点

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ABのサンプルにWinsockを使ったものが紹介されているので、ここではwininetを使ったものでも。
wininetはとても簡単で、ファイル操作と同じ感覚で使うことができる。
InternetOpenでNetを開く、
InternetOpenUrlでurlにつなぐ
InternetReadFileで読み込む
InternetCloseHandleで終了
HttpQueryInfoはサイズやタイプ、更新日時などの情報を得る


以下サンプル

>#console
>
>Declare Function InternetOpen Lib "wininet.dll" Alias "InternetOpenA"(lpszCallerName As BytePtr,dwAccessType As Long,_
>lpszProxyName As BytePtr,lpszProxyBypass As BytePtr,dwFlags As Long) As Long
>Declare Function HttpQueryInfo Lib "wininet.dll" Alias "HttpQueryInfoA"(hHttpRequest As Long,dwInfoLevel As Long,_
>lpvBuffer As BytePtr,ByRef lpdwBufferLength As Long,ByRef lpdwIndex As Long) As Long
>Declare Function InternetCloseHandle Lib "wininet.dll"(hInternetHandle As Long) As Long
>Declare Function InternetOpenUrl Lib "wininet.dll" Alias "InternetOpenUrlA" (hInternetSession As Long,_
>sUrl As BytePtr,sHeaders As Long,lHeadersLength As Long,lFlags As Long,lContext As Long) As Long
>Declare Function InternetReadFile Lib "wininet.dll" (hFile As Long, sBuffer As BytePtr,_
>lNumBytesToRead As Long,lNumberOfBytesRead As Long) As Long
>
>Const HTTP_QUERY_CONTENT_TYPE=1
>Const HTTP_QUERY_CONTENT_LENGTH=5
>Const HTTP_QUERY_LAST_MODIFIED=11
>
>Dim i As String
>
>Download("http://celeb.jpn.ph/princess/img/744.jpg", "test.jpg")
>Input i
>
>
>Sub Download(url As BytePtr, localfile As BytePtr)
>Dim hOpen As HANDLE, hUrl As HANDLE,hFile As HANDLE
>Dim buffer As BytePtr
>Dim Size As Long
>Dim a As Long
>Dim dwReadSize As DWord, dwWriteSize As DWord
>Dim TotalReadSize As DWord
>Print "接続待ち -> ";MakeStr(url)
>Size = 33333
>buffer=calloc(Size)
>hOpen=InternetOpen(0,0,0,0,0)
>hUrl=InternetOpenUrl(hOpen,url,0,0,0,0)
>HttpQueryInfo(url,HTTP_QUERY_CONTENT_LENGTH,buffer,Size,a)
>Print "ファイルサイズ -> " ; MakeStr(buffer)
>hFile = CreateFile(localfile, GENERIC_WRITE, 0, ByVal NULL, CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,0)
>If hFile = INVALID_HANDLE_VALUE Then
>Print "CreateFile失敗"
>Goto *goot
>End If
>Print "DL開始"
>Do 
>InternetReadFile(hUrl, buffer, Size, VarPtr(dwReadSize))
>WriteFile(hFile, buffer, dwReadSize,VarPtr(dwWriteSize), ByVal NULL)
>If dwReadSize <> dwWriteSize Then Print "書き込みエラー？"
>TotalReadSize +=  dwReadSize
>Print TotalReadSize;"Byte"
>Loop While (dwReadSize)
>Print "完了"
>*goot
>CloseHandle(hFile)
>InternetCloseHandle(hUrl)
>InternetCloseHandle(hOpen)
>free(buffer)
>End Sub

ABのサンプルにWinsockを使ったものが紹介されているので、ここではwininetを使ったものでも。
wininetはとても簡単で、ファイル操作と同じ感覚で使うことができる。
InternetOpenでNetを開く、
InternetOpenUrlでurlにつなぐ
InternetReadFileで読み込む
InternetCloseHandleで終了
HttpQueryInfoはサイズやタイプ、更新日時などの情報を得る


以下サンプル

>#console
>
>Declare Function InternetOpen Lib "wininet.dll" Alias "InternetOpenA"(lpszCallerName As BytePtr,dwAccessType As Long,_
>lpszProxyName As BytePtr,lpszProxyBypass As BytePtr,dwFlags As Long) As Long
>Declare Function HttpQueryInfo Lib "wininet.dll" Alias "HttpQueryInfoA"(hHttpRequest As Long,dwInfoLevel As Long,_
>lpvBuffer As BytePtr,ByRef lpdwBufferLength As Long,ByRef lpdwIndex As Long) As Long
>Declare Function InternetCloseHandle Lib "wininet.dll"(hInternetHandle As Long) As Long
>Declare Function InternetOpenUrl Lib "wininet.dll" Alias "InternetOpenUrlA" (hInternetSession As Long,_
>sUrl As BytePtr,sHeaders As Long,lHeadersLength As Long,lFlags As Long,lContext As Long) As Long
>Declare Function InternetReadFile Lib "wininet.dll" (hFile As Long, sBuffer As BytePtr,_
>lNumBytesToRead As Long,lNumberOfBytesRead As Long) As Long
>
>Const HTTP_QUERY_CONTENT_TYPE=1
>Const HTTP_QUERY_CONTENT_LENGTH=5
>Const HTTP_QUERY_LAST_MODIFIED=11
>
>Dim i As String
>
>Download("http://celeb.jpn.ph/princess/img/744.jpg", "test.jpg")
>Input i
>
>
>Sub Download(url As BytePtr, localfile As BytePtr)
>Dim hOpen As HANDLE, hUrl As HANDLE,hFile As HANDLE
>Dim buffer As BytePtr
>Dim Size As Long
>Dim a As Long
>Dim dwReadSize As DWord, dwWriteSize As DWord
>Dim TotalReadSize As DWord
>Print "接続待ち -> ";MakeStr(url)
>Size = 33333
>buffer=calloc(Size)
>hOpen=InternetOpen(0,0,0,0,0)
>hUrl=InternetOpenUrl(hOpen,url,0,0,0,0)
>HttpQueryInfo(url,HTTP_QUERY_CONTENT_LENGTH,buffer,Size,a)
>Print "ファイルサイズ -> " ; MakeStr(buffer)
>hFile = CreateFile(localfile, GENERIC_WRITE, 0, ByVal NULL, CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,0)
>If hFile = INVALID_HANDLE_VALUE Then
>Print "CreateFile失敗"
>Goto *goot
>End If
>Print "DL開始"
>Do 
>InternetReadFile(hUrl, buffer, Size, VarPtr(dwReadSize))
>WriteFile(hFile, buffer, dwReadSize,VarPtr(dwWriteSize), ByVal NULL)
>If dwReadSize <> dwWriteSize Then Print "書き込みエラー？"
>TotalReadSize +=  dwReadSize
>Print TotalReadSize;"Byte"
>Loop While (dwReadSize)
>Print "完了"
>	*goot
>CloseHandle(hFile)
>InternetCloseHandle(hUrl)
>InternetCloseHandle(hOpen)
>free(buffer)
>End Sub