private static string GetMessageFromModule(
string modulePath, int errorNumber, CultureInfo culture)
{
const uint LOAD_LIBRARY_AS_DATAFILE = 2;
const int RT_RCDATA = 10;
IntPtr msgModule = NativeMethods.LoadLibraryEx(
modulePath, IntPtr.Zero, LOAD_LIBRARY_AS_DATAFILE);
if (msgModule == IntPtr.Zero)
{
return(null);
}
try
{
// On pre-Vista systems, the messages are stored as RCDATA resources.
int lcid = 0;
IntPtr resourceInfo = NativeMethods.FindResourceEx(
msgModule,
new IntPtr(RT_RCDATA),
new IntPtr(errorNumber),
(ushort)lcid);
if (resourceInfo != IntPtr.Zero)
{
IntPtr resourceData = NativeMethods.LoadResource(
msgModule, resourceInfo);
IntPtr resourcePtr = NativeMethods.LockResource(resourceData);
if (lcid == 0)
{
string msg = Marshal.PtrToStringAnsi(resourcePtr);
return(msg);
}
else
{
int len = 0;
while (Marshal.ReadByte(resourcePtr, len) != 0)
{
len++;
}
byte[] msgBytes = new byte[len + 1];
Marshal.Copy(resourcePtr, msgBytes, 0, msgBytes.Length);
Encoding encoding = Encoding.ASCII;
string msg = encoding.GetString(msgBytes);
return(msg);
}
}
else
{
// On Vista (and above?), the messages are stored in the module message table.
// They're actually in MUI files, and the redirection happens automatically here.
const uint FORMAT_MESSAGE_IGNORE_INSERTS = 0x00000200;
const uint FORMAT_MESSAGE_FROM_HMODULE = 0x00000800;
const uint MESSAGE_OFFSET = 20000; // Not documented, but observed on Vista
StringBuilder buf = new StringBuilder(1024);
uint formatCount = NativeMethods.FormatMessage(
FORMAT_MESSAGE_FROM_HMODULE | FORMAT_MESSAGE_IGNORE_INSERTS,
msgModule,
(uint)errorNumber + MESSAGE_OFFSET,
(ushort)lcid,
buf,
(uint)buf.Capacity,
IntPtr.Zero);
return(formatCount != 0 ? buf.ToString().Trim() : null);
}
}
finally
{
NativeMethods.FreeLibrary(msgModule);
}
}
