We got a question in the comments:
I wonder how I can set the proxy server for WinInet
programmatically? Actually I want to be able to flip flop the proxy setting
(for IE) programmatically. Thanks Victor
There is two parts to doing this.
- Pass NULL as the handle to InternetSetOption using the
INTERNET_OPTION_PER_CONNECTION_OPTION instead of the legacy INTERNET_OPTION_PROXY
(See KB226473: How to programmatically query and set proxy settings under Internet Explorer
for more on this step)
- Call InternetSetOption with INTERNET_OPTION_PROXY_SETTINGS_CHANGED with
NULL Buffer and 0 BufferLength to let all the instances of WinInet know to
update their proxy settings. You can also use
INTERNET_OPTION_SETTINGS_CHANGED but it has side effects on any Keep Alive
connections in your current process.
Good luck Victor and sorry for the late response.