InternetQueryOptionA function (wininet.h)
Queries an Internet option on the specified handle.
Syntax
BOOL InternetQueryOptionA(
[in] HINTERNET hInternet,
[in] DWORD dwOption,
[out] LPVOID lpBuffer,
[in, out] LPDWORD lpdwBufferLength
);
Parameters
[in] hInternet
Handle on which to query information.
[in] dwOption
Internet option to be queried. This can be one of the Option Flags values.
[out] lpBuffer
Pointer to a buffer that receives the option setting. Strings returned by InternetQueryOption are globally allocated, so the calling application must free them when it is finished using them.
[in, out] lpdwBufferLength
Pointer to a variable that contains the size of lpBuffer, in bytes. When InternetQueryOption returns, lpdwBufferLength specifies the size of the data placed into lpBuffer. If GetLastError returns ERROR_INSUFFICIENT_BUFFER, this parameter points to the number of bytes required to hold the requested information.
Return value
Returns TRUE if successful, or FALSE otherwise. To get a specific error message, call GetLastError.
Remarks
GetLastError will return the ERROR_INVALID_PARAMETER if an option flag that is invalid for the specified handle type is passed to the dwOption parameter.
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
The wininet.h header defines InternetQueryOption as an alias that automatically selects the ANSI or Unicode version of this function based on the definition of the UNICODE preprocessor constant. Mixing usage of the encoding-neutral alias with code that is not encoding-neutral can lead to mismatches that result in compilation or runtime errors. For more information, see Conventions for Function Prototypes.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 2000 Professional [desktop apps only] |
| Minimum supported server | Windows 2000 Server [desktop apps only] |
| Target Platform | Windows |
| Header | wininet.h |
| Library | Wininet.lib |
| DLL | Wininet.dll |