WININET. DLL programming problem of FTPOpenFile in 21 port can, other can't open port-CodePudding

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WININET. DLL programming problem of FTPOpenFile in 21 port can, other can't open port

Time：09-22

This is why

Connect these normal front, but use FTPOpenFile returns is 0

The same procedure, the same FTP server, changed back to the port 21 is good

CodePudding user response:

To retrieve a specific error message, call GetLastError.

CodePudding user response:

Geterror also return an error,

CodePudding user response:

Check your firewall Settings

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