How to use FTP WinInet APIs in Visual Basic with SimpleFtp
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This article provides the sample file that demonstrates how to use WinInet FTP APIs in a Visual Basic (VB) application.
Original product version: Internet Explorer
Original KB number: 195653
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
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
InternetWriteFile. Upon clicking the Put Large File button, the sample will use this method.
- By using the
- 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 the second method above; however, you should use the
InternetReadFileAPI instead of
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 Basic 5.0.
The following file is available for download from the Microsoft Download Center:
For more information about how to download Microsoft Support files, see How to Obtain Microsoft Support Files from Online Services.
Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help to prevent any unauthorized changes to the file.
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
For more information, see the following articles: