I'm trying to get the IE proxy settings using WinHttp
in the sample, WinHttpGetIEProxyConfigForCurrentUser works as expected, but
WinHttpGetProxyForUrl always fails with errocode 87
(ERROR_INVALID_PARAMETER)
The call WinHttpGetProxyForUrl is neccesary with pac/wpad scripts
Anyone has an idea ?
Maybe there's something wrong with the C++ conversion ?
MS link: http://msdn.microsoft.com/en-us/library/aa384122(VS.85).aspx
thanks,
Paul
program sample:
the program has a button and a Memo
uses
procedure ShowInfo(S: string);
begin
frmMain.Memo1.Lines.Add(S);
end;
function GetProxyForUrl(Url: string;
var Proxy, ProxyBypass, AutoConfigUrl: string):
DWord;
var
HLib: THandle;
Config: TWinHttpCurrentUserIEProxyConfig;
AutoProxyOptions: TWinHttpAutoProxyOptions;
ProxyInfo: TWinHttpProxyInfo;
fDoAutoFroxy: boolean;
hSession: HINTERNET;
begin
fDoAutoFroxy:= false;
AutoProxyOptions.dwFlags:= 0;
AutoProxyOptions.dwAutoDetectFlags:= 0;
AutoProxyOptions.lpvReserved:= nil;
AutoProxyOptions.dwReserved:= 0;
Result:= 0;
HLib := LoadLibrary ('winhttp.dll');
if HLib = 0 then exit;
try
if WinHttpProxy.WinHttpGetIEProxyConfigForCurrentUser(Config) then begin
// save what we got already
Proxy:= Config.lpszProxy;
ProxyBypass:= Config.lpszProxyBypass;
AutoConfigUrl:= Config.lpszAutoConfigUrl;
ShowInfo('ProxyConfigForCurrentUser result:');
ShowInfo(' Proxy = ' + Proxy);
ShowInfo(' ProxyBypass = ' + ProxyBypass);
ShowInfo(' AutoConfigUrl = ' + AutoConfigUrl);
ShowInfo(' AutoDetect = ' +
BoolToStr(Config.fAutoDetect));
if Config.fAutoDetect then begin // IE configured for auto-detect
AutoProxyOptions.dwFlags:= WINHTTP_AUTOPROXY_AUTO_DETECT;
AutoProxyOptions.dwAutoDetectFlags:=
WINHTTP_AUTO_DETECT_TYPE_DHCP +
WINHTTP_AUTO_DETECT_TYPE_DNS_A;
fDoAutoFroxy:= true;
end;
if Config.lpszAutoConfigUrl <> '' then begin // IE uses pac
AutoProxyOptions.dwFlags:=
AutoProxyOptions.dwFlags + WINHTTP_AUTOPROXY_CONFIG_URL;
AutoProxyOptions.lpszAutoConfigUrl:= Config.lpszAutoConfigUrl;
fDoAutoFroxy:= true;
end;
end
else begin
// IE proxy config not available - try auto-detection
AutoProxyOptions.dwFlags:= WINHTTP_AUTOPROXY_AUTO_DETECT;
AutoProxyOptions.dwAutoDetectFlags:= WINHTTP_AUTO_DETECT_TYPE_DHCP +
WINHTTP_AUTO_DETECT_TYPE_DNS_A;
fDoAutoFroxy:= true;
end;
if fDoAutoFroxy then
try
// we need to create a temp internet session
hSession:= WinHttpOpen(nil,
WINHTTP_ACCESS_TYPE_NO_PROXY,
nil,
nil,
0);
ShowInfo('Auto Detect');
// automatically supply client domain credentials
AutoProxyOptions.fAutoLogonIfChallenged:= true;
if WinHttpProxy.WinHttpGetProxyForUrl(hSession,
PWideChar(Url),
AutoProxyOptions,
ProxyInfo) then begin
Proxy:= ProxyInfo.lpszProxy;
end
else result:= GetLastError;
finally
WinHttpCloseHandle(hSession);
end;
finally
FreeLibrary (HLib);
end;
end;
procedure TfrmMain.Button1Click(Sender: TObject);
var
Proxy, ProxyBypass, AutoConfigUrl: string;
ErrCode: DWord;
begin
ErrCode:= GetProxyForUrl('https://www.microsoft.com/en/us/default.aspx',
ProxyBypass, AutoConfigUrl);
ShowInfo('ErrCode = ' + IntToStr(ErrCode));
end;
//--------------------------------------
//unit with WinHttp const and function calls:
unit WinHttpProxy;
interface
uses Windows;
type
HINTERNET = Pointer;
PWinHttpProxyInfo = ^TWinHttpProxyInfo;
TWinHttpProxyInfo = record
dwAccessType : DWORD; // see WINHTTP_ACCESS_ types below
lpszProxy : LPWSTR; // proxy server list
lpszProxyBypass : LPWSTR; // proxy bypass list
end;
PWinHttpAutoProxyOptions = ^TWinHttpAutoProxyOptions;
TWinHttpAutoProxyOptions = record
dwFlags : DWORD;
dwAutoDetectFlags : DWORD;
lpszAutoConfigUrl : LPWSTR; //PWideChar;
lpvReserved : Pointer;
dwReserved : DWORD;
fAutoLogonIfChallenged: BOOL;
end;
PWinHttpCurrentUserIEProxyConfig = ^TWinHttpCurrentUserIEProxyConfig;
TWinHttpCurrentUserIEProxyConfig = record
fAutoDetect : boolean;
lpszAutoConfigUrl : LPWSTR; //PWideChar;
lpszProxy : LPWSTR; //PWideChar;
lpszProxyBypass : LPWSTR; //PWideChar;
end;
const
winhttpdll = 'winhttp.dll';
WINHTTP_ACCESS_TYPE_DEFAULT_PROXY = 0;
WINHTTP_ACCESS_TYPE_NO_PROXY = 1;
WINHTTP_ACCESS_TYPE_NAMED_PROXY = 3;
WINHTTP_NO_PROXY_NAME = nil;
WINHTTP_NO_PROXY_BYPASS = nil;
INTERNET_DEFAULT_PORT = 0;
INTERNET_DEFAULT_HTTP_PORT = 80;
INTERNET_DEFAULT_HTTPS_PORT = 443;
INTERNET_SCHEME_HTTP = (1);
INTERNET_SCHEME_HTTPS = (2);
WINHTTP_AUTOPROXY_AUTO_DETECT = $00000001;
WINHTTP_AUTOPROXY_CONFIG_URL = $00000002;
WINHTTP_AUTOPROXY_RUN_OUTPROCESS_ONLY = $00020000;
WINHTTP_AUTO_DETECT_TYPE_DHCP = $00000001;
WINHTTP_AUTO_DETECT_TYPE_DNS_A = $00000002;
WINHTTP_ERROR_BASE = 12000;
ERROR_WINHTTP_AUTO_PROXY_SERVICE_ERROR = (WINHTTP_ERROR_BASE + 178);
ERROR_WINHTTP_BAD_AUTO_PROXY_SCRIPT = (WINHTTP_ERROR_BASE + 166);
{ prototypes }
//function WinHttpQueryOption(hInet: HINTERNET; dwOption: DWORD;
// lpBuffer: Pointer; var lpdwBufferLength: DWORD): BOOL; stdcall;
// {$EXTERNALSYM WinHttpQueryOption}
//function WinHttpDetectAutoProxyConfigUrl(dwAutoDetectFlags: DWORD;
// var ppwszAutoConfigUrl: LPWSTR): BOOL; stdcall;
// {$EXTERNALSYM WinHttpDetectAutoProxyConfigUrl}
function WinHttpGetDefaultProxyConfiguration(
var pProxyInfo: TWinHttpProxyInfo): BOOL; stdcall;
{$EXTERNALSYM WinHttpGetDefaultProxyConfiguration}
function WinHttpGetIEProxyConfigForCurrentUser(
var pProxyInfo: TWinHttpCurrentUserIEProxyConfig): BOOL; stdcall;
{$EXTERNALSYM WinHttpGetIEProxyConfigForCurrentUser}
function WinHttpGetProxyForUrl(hSession: HINTERNET; lpcwszUrl: PWideChar;
pAutoProxyOptions: TWinHttpAutoProxyOptions;
var pProxyInfo: TWinHttpProxyInfo): BOOL; stdcall;
{$EXTERNALSYM WinHttpGetProxyForUrl}
function WinHttpCheckPlatform: BOOL; stdcall;
{$EXTERNALSYM WinHttpCheckPlatform}
function WinHttpOpen(pwszUserAgent: PWideChar; dwAccessType: DWORD;
pwszProxyName, pwszProxyBypass: PWideChar; dwFlags: DWORD): HINTERNET;
stdcall;
{$EXTERNALSYM WinHttpOpen}
function WinHttpCloseHandle(hInternet: HINTERNET): BOOL; stdcall;
{$EXTERNALSYM WinHttpCloseHandle}
implementation
function WinHttpGetDefaultProxyConfiguration; external winhttpdll name
'WinHttpGetDefaultProxyConfiguration';
function WinHttpGetIEProxyConfigForCurrentUser; external winhttpdll name
'WinHttpGetIEProxyConfigForCurrentUser';
function WinHttpCheckPlatform; external winhttpdll name
'WinHttpCheckPlatform';
function WinHttpOpen; external winhttpdll name
'WinHttpOpen';
function WinHttpCloseHandle; external winhttpdll name
'WinHttpCloseHandle';
function WinHttpGetProxyForUrl; external winhttpdll name
'WinHttpGetProxyForUrl';
end.
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