/// <summary>
/// Loads the User Instance dll.
/// </summary>
private bool LoadUserInstanceDll()
{
long scopeID = SqlClientEventSource.Log.TrySNIScopeEnterEvent("<sc.SNI.LocalDB.Windows.LoadUserInstanceDll |SNI>");
try
{
// Check in a non thread-safe way if the handle is already set for performance.
if (_sqlUserInstanceLibraryHandle != null)
{
return(true);
}
lock (this)
{
if (_sqlUserInstanceLibraryHandle != null)
{
return(true);
}
//Get UserInstance Dll path
LocalDBErrorState registryQueryErrorState;
// Get the LocalDB instance dll path from the registry
string dllPath = GetUserInstanceDllPath(out registryQueryErrorState);
// If there was no DLL path found, then there is an error.
if (dllPath == null)
{
SNILoadHandle.SingletonInstance.LastError = new SNIError(SNIProviders.INVALID_PROV, 0, MapLocalDBErrorStateToCode(registryQueryErrorState), MapLocalDBErrorStateToErrorMessage(registryQueryErrorState));
SqlClientEventSource.Log.TrySNITraceEvent("<sc.SNI.LocalDB.Windows.LoadUserInstanceDll |SNI|ERR >User instance DLL path is null.");
return(false);
}
// In case the registry had an empty path for dll
if (string.IsNullOrWhiteSpace(dllPath))
{
SNILoadHandle.SingletonInstance.LastError = new SNIError(SNIProviders.INVALID_PROV, 0, SNICommon.LocalDBInvalidSqlUserInstanceDllPath, Strings.SNI_ERROR_55);
SqlClientEventSource.Log.TrySNITraceEvent("<sc.SNI.LocalDB.Windows.LoadUserInstanceDll |SNI|ERR > User instance DLL path is invalid. DLL path ={0}", dllPath);
return(false);
}
// Load the dll
SafeLibraryHandle libraryHandle = Interop.Kernel32.LoadLibraryExW(dllPath.Trim(), IntPtr.Zero, 0);
if (libraryHandle.IsInvalid)
{
SNILoadHandle.SingletonInstance.LastError = new SNIError(SNIProviders.INVALID_PROV, 0, SNICommon.LocalDBFailedToLoadDll, Strings.SNI_ERROR_56);
SqlClientEventSource.Log.TrySNITraceEvent("<sc.SNI.LocalDB.Windows.LoadUserInstanceDll |SNI|ERR > Library Handle is invalid. Could not load the dll.");
libraryHandle.Dispose();
return(false);
}
// Load the procs from the DLLs
_startInstanceHandle = Interop.Kernel32.GetProcAddress(libraryHandle, ProcLocalDBStartInstance);
if (_startInstanceHandle == IntPtr.Zero)
{
SNILoadHandle.SingletonInstance.LastError = new SNIError(SNIProviders.INVALID_PROV, 0, SNICommon.LocalDBBadRuntime, Strings.SNI_ERROR_57);
SqlClientEventSource.Log.TrySNITraceEvent("<sc.SNI.LocalDB.Windows.LoadUserInstanceDll |SNI|ERR > Was not able to load the PROC from DLL. Bad Runtime.");
libraryHandle.Dispose();
return(false);
}
// Set the delegate the invoke.
localDBStartInstanceFunc = (LocalDBStartInstance)Marshal.GetDelegateForFunctionPointer(_startInstanceHandle, typeof(LocalDBStartInstance));
if (localDBStartInstanceFunc == null)
{
SNILoadHandle.SingletonInstance.LastError = new SNIError(SNIProviders.INVALID_PROV, 0, SNICommon.LocalDBBadRuntime, Strings.SNI_ERROR_57);
libraryHandle.Dispose();
_startInstanceHandle = IntPtr.Zero;
return(false);
}
_sqlUserInstanceLibraryHandle = libraryHandle;
SqlClientEventSource.Log.TrySNITraceEvent("<sc.SNI.LocalDB.Windows.LoadUserInstanceDll |SNI|INFO > User Instance DLL was loaded successfully.");
return(true);
}
}
finally
{
SqlClientEventSource.Log.TrySNIScopeLeaveEvent(scopeID);
}
}
/// <summary>
/// Loads the User Instance dll.
/// </summary>
private bool LoadUserInstanceDll()
{
// Check in a non thread-safe way if the handle is already set for performance.
if (_sqlUserInstanceLibraryHandle != null)
{
return(true);
}
lock (this)
{
if (_sqlUserInstanceLibraryHandle != null)
{
return(true);
}
//Get UserInstance Dll path
LocalDBErrorState registryQueryErrorState;
// Get the LocalDB instance dll path from the registry
string dllPath = GetUserInstanceDllPath(out registryQueryErrorState);
// If there was no DLL path found, then there is an error.
if (dllPath == null)
{
SNILoadHandle.SingletonInstance.LastError = new SNIError(SNIProviders.INVALID_PROV, 0, MapLocalDBErrorStateToCode(registryQueryErrorState), string.Empty);
return(false);
}
// In case the registry had an empty path for dll
if (string.IsNullOrWhiteSpace(dllPath))
{
SNILoadHandle.SingletonInstance.LastError = new SNIError(SNIProviders.INVALID_PROV, 0, SNICommon.LocalDBInvalidSqlUserInstanceDllPath, string.Empty);
return(false);
}
// Load the dll
SafeLibraryHandle libraryHandle = Interop.Kernel32.LoadLibraryExW(dllPath.Trim(), IntPtr.Zero, 0);
if (libraryHandle.IsInvalid)
{
SNILoadHandle.SingletonInstance.LastError = new SNIError(SNIProviders.INVALID_PROV, 0, SNICommon.LocalDBFailedToLoadDll, string.Empty);
libraryHandle.Dispose();
return(false);
}
// Load the procs from the DLLs
_startInstanceHandle = Interop.Kernel32.GetProcAddress(libraryHandle, ProcLocalDBStartInstance);
if (_startInstanceHandle == IntPtr.Zero)
{
SNILoadHandle.SingletonInstance.LastError = new SNIError(SNIProviders.INVALID_PROV, 0, SNICommon.LocalDBBadRuntime, string.Empty);
libraryHandle.Dispose();
return(false);
}
// Set the delegate the invoke.
localDBStartInstanceFunc = (LocalDBStartInstance)Marshal.GetDelegateForFunctionPointer(_startInstanceHandle, typeof(LocalDBStartInstance));
if (localDBStartInstanceFunc == null)
{
SNILoadHandle.SingletonInstance.LastError = new SNIError(SNIProviders.INVALID_PROV, 0, SNICommon.LocalDBBadRuntime, string.Empty);
libraryHandle.Dispose();
_startInstanceHandle = IntPtr.Zero;
return(false);
}
_sqlUserInstanceLibraryHandle = libraryHandle;
return(true);
}
}
