3 out of 11 rated this helpful - Rate this topic

InternetSetOption function

Applies to: desktop apps only

Sets an Internet option.

Syntax

Copy

BOOL InternetSetOption(
  __in  HINTERNET hInternet,
  __in  DWORD dwOption,
  __in  LPVOID lpBuffer,
  __in  DWORD dwBufferLength
);

Parameters

hInternet [in]: Handle on which to set information.
dwOption [in]: Internet option to be set. This can be one of the Option Flags values.
lpBuffer [in]: Pointer to a buffer that contains the option setting.
dwBufferLength [in]: Size of the lpBuffer buffer. If lpBuffer contains a string, the size is in TCHARs. If lpBuffer contains anything other than a string, the size is in bytes.

Return value

Returns TRUE if successful, or FALSE otherwise. To get a specific error message, call GetLastError.

Remarks

GetLastError will return the error ERROR_INVALID_PARAMETER if an option flag that cannot be set is specified.

For more information, see Setting and Retrieving Internet Options.

Like all other aspects of the WinINet API, this function cannot be safely called from within DllMain or the constructors and destructors of global objects.

Note WinINet does not support server implementations. In addition, it should not be used from a service. For server implementations or services use Microsoft Windows HTTP Services (WinHTTP).

Requirements

Minimum supported client	Windows 2000 Professional
Minimum supported server	Windows 2000 Server
Header	Wininet.h
Library	Wininet.lib
DLL	Wininet.dll
Unicode and ANSI names	InternetSetOptionW (Unicode) and InternetSetOptionA (ANSI)

I could not get this sample to work. I ran the sample code and even though InternetSetOptions returned a value of bReturn == 1 (i.e. it indicates it ran sucessfully) a subsequent query confirmed that no parameters were changed. Is this the only way to enable/disable Internet Explorer proxy programmatically?

History