public static bool PromptForCredentials2(
IWin32Window parent,
string messageText,
string captionText,
Win32Error errorCode,
ref string domainName,
ref string userName,
ref string password,
ref bool save,
CredUiWinFlags flags
)
{
Win32Error result;
CredUiInfo info = new CredUiInfo();
int authenticationPackage = 0;
IntPtr outAuthBuffer;
int outAuthBufferSize;
info.Size = System.Runtime.InteropServices.Marshal.SizeOf(typeof(CredUiInfo));
info.Parent = parent != null ? parent.Handle : IntPtr.Zero;
info.MessageText = messageText;
info.CaptionText = captionText;
using (var inAuthBuffer = PackCredentials(0, userName, password))
{
result = Win32.CredUIPromptForWindowsCredentials(
ref info,
errorCode,
ref authenticationPackage,
inAuthBuffer,
inAuthBuffer.Size,
out outAuthBuffer,
out outAuthBufferSize,
ref save,
flags
);
if (result == Win32Error.Cancelled)
return false;
if (result != Win32Error.Success)
Win32.Throw(result);
try
{
UnpackCredentials(
new MemoryRegion(outAuthBuffer, 0, outAuthBufferSize),
CredPackFlags.ProtectedCredentials,
out domainName,
out userName,
out password
);
return true;
}
finally
{
System.Runtime.InteropServices.Marshal.FreeCoTaskMem(outAuthBuffer);
}
}
}
public static bool PromptForCredentials(
IWin32Window parent,
string messageText,
string captionText,
string targetName,
Win32Error errorCode,
ref string userName,
ref string password,
ref bool save,
CredUiFlags flags
)
{
const int maxBytes = 0x200;
const int maxChars = (maxBytes - 2) / 2;
Win32Error result;
CredUiInfo info = new CredUiInfo();
if (userName.Length > maxChars || password.Length > maxChars)
throw new ArgumentException("The user name or password string is too long.");
info.Size = System.Runtime.InteropServices.Marshal.SizeOf(typeof(CredUiInfo));
info.Parent = parent != null ? parent.Handle : IntPtr.Zero;
info.MessageText = messageText;
info.CaptionText = captionText;
using (var userNameAlloc = new MemoryAlloc(maxBytes))
using (var passwordAlloc = new MemoryAlloc(maxBytes))
{
userNameAlloc.WriteUnicodeString(0, userName);
userNameAlloc.WriteInt16(userName.Length * 2, 0);
passwordAlloc.WriteUnicodeString(0, password);
passwordAlloc.WriteInt16(password.Length * 2, 0);
result = Win32.CredUIPromptForCredentials(
ref info,
targetName,
IntPtr.Zero,
errorCode,
userNameAlloc,
maxBytes / 2,
passwordAlloc,
maxBytes / 2,
ref save,
flags
);
if (result == Win32Error.Cancelled)
return false;
if (result != Win32Error.Success)
Win32.Throw(result);
userName = userNameAlloc.ReadUnicodeString(0);
password = passwordAlloc.ReadUnicodeString(0);
return true;
}
}
