C++/WinInet Change Proxy Settings Windows 7

Question

[Disclaimer: this is a Windows 7 specific issue as far as I can tell]

I\'ve got a block of code that changes the proxy settings in the Windows registry, then proceed

Answer 1

FWIW my original problem was not using the entire WinInet API to handle the proxy settings. The answer has been staring me in the face from the beginning... A final solution might look something like:

LPWSTR proxyName;

if (on) {
    proxyName = L"http=[IPADDRESS:PORT];https=[IPADDRESS:PORT]";
} else {
    proxyName = 0;
}

INTERNET_PER_CONN_OPTION_LIST OptionList;
INTERNET_PER_CONN_OPTION Option[3];
unsigned long listSize = sizeof(INTERNET_PER_CONN_OPTION_LIST);
Option[0].dwOption = INTERNET_PER_CONN_PROXY_SERVER;
Option[1].dwOption = INTERNET_PER_CONN_FLAGS;
Option[2].dwOption = INTERNET_PER_CONN_PROXY_BYPASS;
OptionList.dwSize = sizeof(INTERNET_PER_CONN_OPTION_LIST);
OptionList.pszConnection = NULL;
OptionList.dwOptionCount = 3;
OptionList.dwOptionError = 0;

DWORD proxyType = PROXY_TYPE_DIRECT; // this proxy type disables any proxy server

if (proxyName) {
    if (proxyName[0]) {
        proxyType = PROXY_TYPE_PROXY; // a name has been passed, so choose the correct proxy type for enabling the proxy server
    }
}

Option[0].Value.pszValue = (LPWSTR)proxyName;
Option[1].Value.dwValue = proxyType;
    if (on) {
            Option[2].Value.pszValue = (LPWSTR)L"";
    } else {
            Option[2].Value.pszValue = (LPWSTR)L"";
    }
OptionList.pOptions = Option;

    if (!InternetSetOption(0, INTERNET_OPTION_PER_CONNECTION_OPTION, &OptionList, listSize)) {
            // handle error
    }

InternetSetOption(0, INTERNET_OPTION_REFRESH, NULL, NULL);

Answer 2

There's not much information to go by, but you may want to attempt to set the keys in both HKEY_LOCAL_MACHINE and HKEY_CURRENT_USER if you aren't already doing so.

If you're only setting it in HKEY_CURRENT_USER, it's possible that it's being copied from HKEY_LOCAL_MACHINE and overwritten.