Using FTP WinInet APIs in Visual Basic with SimpleFtp
ID: Q195653
|
The information in this article applies to:
-
Internet Client SDK, versions 4.0, 4.01
-
Microsoft ActiveX SDK, version 1.0
-
Microsoft Visual Basic Professional and Enterprise Editions for Windows, versions 5.0, 6.0
SUMMARY
This sample file demonstrates how to use WinInet FTP APIs in a Visual Basic
(VB) application.
MORE INFORMATION
The sample demonstrates the following concepts:
- How to enumerate a directory on the FTP server and return file
information such as creation date and size.
- How to upload large files to the FTP server without blocking the entire
application and with reporting transfer progress. There are two ways of
uploading a file:
- By using the FtpPutFile() API. However, this API blocks until the
entire file has been uploaded. Upon clicking the Put button, the sample
will use this method.
- By using FtpOpenFile and InternetWriteFile. Once the file is open it
can be uploaded in chunks. This enables the application to report upload
status and avoid blocking. It does this by calling DoEvents() between
calling InternetWriteFile. Upon clicking the Put Large File button, the
sample will use this method.
- How to get text information for WinInet errors and how to retrieve
extended error information. For simplicity, the sample does not
implement downloading of the large files. This functionality is similar
to method b) above; however, you should use the InternetReadFile API
instead of InternetWriteFile.
Notes
- This sample uses pre-configured access to the Internet. WinInet FTP APIs
do not work if Internet access is accomplished via CERN type proxy.
- This sample was created with Visual Basic 6.0. There may be an error if
the project is opened in Visual Basic5.0.
- WinInet documentation can be found at the following Web site:
http://www.msdn.microsoft.com/workshop/
Click "Networking, Protocols & Data Formats" in the Table of Contents, then
click "Win32 Internet Functions."
The following file is available for download from the Microsoft
Download Center. Click the file name below to download the file:
VBSMPFTP.exe
For more information about how to download files from the Microsoft
Download Center, please visit the Download Center at the following Web
address
http://www.microsoft.com/downloads/search.asp
and then click How to use the Microsoft Download Center.
Vbsmpftp.exe contains the following files:
FileName Size
---------------------------------------------------------
ErrorForm.frm 1,216
ErrorForm.frx 6
readme.txt 1,869
SimpleFtp.bas 5,364
SimpleFtp.exe 40,960
SimpleFtp.frm 13,491
SimpleFtp.vbp 646
SimpleFtp.vbw 118
REFERENCES
For additional information, please see the following
articles in the Microsoft Knowledge Base:
Q166961 HOWTO: FTP with CERN-Based Proxy Using WinInet API
Q193625 WinInet Error Codes (12001 through 12156)
Q216214 SAMPLE: FTP with CERN-Based Password Protected Proxy
© Microsoft Corporation 1999, All Rights Reserved.
Contributions by Leon Braginski, Microsoft Corporation
Additional query words:
Keywords : kbfile kbsample kbSDKInet401 kbDSupport
Version : WINDOWS:1.0,4.0,4.01,5.0,6.0
Platform : WINDOWS
Issue type : kbinfo