printf("IcmpCreatefile returned error: %ld\n", GetLastError());

Return Values : Returns TRUE if successful, or FALSE otherwise. To get a specific error message, call GetLastError.

    [DllImport("wininet.dll", EntryPoint = "GetLastError")]

    public static extern long GetLastError();

    * Returns a valid handle to the FTP, Gopher, or HTTP session if the connection is successful, or NULL otherwise. To get extended error information, call GetLastError. An application can also use InternetGetLastResponseInfo to determine why access to the service was denied.

/// <returns>Returns TRUE if the file exists, or FALSE otherwise. Call GetLastError for extended error information.</returns>

''' <returns>Returns TRUE if the file exists, or FALSE otherwise. Call GetLastError for extended error information.</returns>

static extern IntPtr MsiGetLastErrorRecord();

If the function cannot find an account name for the SID, the LookupAccountSid function fails and GetLastError returns ERROR_NONE_MAPPED. This can occur if a network time-out prevents the function from finding the name. It also occurs for SIDs that have no corresponding account name, such as a logon SID that identifies a logon session.

    int error = GetLastError();

        aWinErrorCode = (uint)GetLastError();

public static void SetFileOrFolderOwner(String objectName) //Note this is very basic and is silent on fail as I havent checked GetlastError and thrown an exception etc

                Console.WriteLine("Call to EnumDeviceDrivers failed!  To get extended error information, call GetLastError.");

                Console.WriteLine("Call to EnumDeviceDrivers failed!  To get extended error information, call GetLastError.");

                Console.WriteLine("Call to EnumDeviceDrivers failed!  To get extended error information, call GetLastError.");

                Console.WriteLine("Call to EnumDeviceDrivers failed!  To get extended error information, call GetLastError.");

I'd go so far as to recommend always mandating SetLastError -- explicitly setting SetLastError=false, to call out the (comparatively rare) Win32 functions that don't expose a failure path through GetLastError.

If the function succeeds, the return value is a handle to the newly created device-independent bitmap (and ppvBits will point to the bitmap’s bit values). If the function fails, the return value is NULL (and ptr ppvBits will be NULL). To get extended error information, call GetLastError.

• Do NOT use GetLastError, use Marshal.GetLastWin32Error

• Do NOT use GetLastError, use Marshal.GetLastWin32Error

If the function succeeds, the return value is nonzero. If the function fails, the return value is zero. To get extended error information, call GetLastError.

                    // check GetLastError value (MUST use this call. See MSDN)

    private static extern uint GetLastError();*/

   Private Declare Function GetLastError Lib "kernel32" Alias "GetLastError" () As Integer

       MsgBox(GetLastError())

       MsgBox(GetLastError())

       MsgBox(GetLastError())

       MsgBox(GetLastError())

static extern uint GetLastError();

// GetLastError is save!

Tested extensively here http://stackoverflow.com/questions/17918266/winapi-getlasterror-vs-marshal-getlastwin32error

// You should never PInvoke to GetLastError.  Call Marshal.GetLastWin32Error instead!

' You should never PInvoke to GetLastError.  Call Marshal.GetLastWin32Error instead!

Calling GetLastError directly via PInvoke is not guaranteed to work due to the CLR's internal interaction with the operating system. Instead, call Marshal.GetLastWin32Error.

/// If the function fails, the return value is TIME_ZONE_ID_INVALID. To get extended error information, call GetLastError.

/// If the function fails, the return value is zero. To get extended error information, call GetLastError.

If you forget to set the OSVersionInfoSize field of the OSVERSIONINFO struct, the function will return false. GetLastError() will return:

If you forget to set the OSVersionInfoSize field of the OSVERSIONINFO struct, the function will return false. GetLastError() will return:

Return Value - If the function succeeds, the return value is nonzero. If the function fails, the return value is zero. To get extended error information, call GetLastError.

The SetLastError flag needs to be set to true in order to retain information that would be obtained from GetLastError in the event of an error being returned.

                else if(GetLastError() == ERROR_INSUFFICIENT_BUFFER)

                    Marshal.ThrowExceptionForHR(GetLastError());

Call SetLastError(0) at the beginning of your function if you'll use GetLastError.

        /// If the function fails, the return value is TIME_ZONE_ID_INVALID. To get extended error information, call GetLastError.

        /// If the function fails, the return value is zero. To get extended error information, call GetLastError.

static extern uint GetLastError();

           throw new Win32Exception((int)GetLastError());

           throw new Win32Exception((int)GetLastError());

    ''' <returns>Nonzero indicates success. Zero indicates failure. To get extended error information, call GetLastError.</returns>

    ''' <returns>Nonzero indicates success. Zero indicates failure. To get extended error information, call GetLastError.</returns>

//public static extern int GetLastError();

You will need the above ProcessInfo class and may also want to use GetLastError and WaitForSingleObject.

Returns true if function succeeds; otherwise, false. To retrieve extended error information, call GetLastError

static extern Int32 GetLastError();

Declare Function GetLastError Lib "coredll.dll" () As Int32

It is recommended that you do not call the Win32 GetLastError method directly. Because of the way P/Invoke works, the error message may get reset between Win32 calls in your code. Instead, call the Marshal.GetLastWin32Error method, which can be combined with the ever useful Marshal.ThrowExceptionForHR method. See below for an example.

Int32 lastError = GetLastError();

lastError = GetLastError()

3 - SYSMEM_FAILED: Change failed. Use GetLastError to get more details.

     int error = Marshal.GetLastWin32Error();    // Equivalent to Win32 GetLastError()

WAIT_FAILED indicates failure. To get extended error information, call GetLastError.

As always, only do SetLastError=true if you actually intend to call GetLastError.

/// If the function fails, the return value is zero. To get extended error information, call GetLastError.

    /// If the function fails, the return value is zero. To get extended error information, call GetLastError.

If no error occurs, sendto returns the total number of bytes sent, which can be less than the number indicated by len. Otherwise, a value of SOCKET_ERROR is returned, and a specific error code can be retrieved by calling WSAGetLastError.

WSAGetLastError.

If no error occurs, sendto returns the total number of bytes sent, which can be less than the number indicated by len. Otherwise, a value of SOCKET_ERROR is returned, and a specific error code can be retrieved by calling WSAGetLastError.

WSAGetLastError.

static extern Int32 WSAGetLastError();

Declare Function WSAGetLastError Lib "ws2_32.dll" () As Int32

    /// <returns>If the function succeeds, the return value is nonzero. If the function fails, the return value is zero. To get extended error information, call GetLastError.</returns>

    /// Returns NULL upon failure. Call the GetLastError function for more information on the error. The following table describe common errors:</returns>

/// <para>If the function fails, the return value is NULL. To get extended error information, call GetLastError.</para>

''' <para>If the function fails, the return value is NULL. To get extended error information, call GetLastError.</para>

When you call this function, the WndProc function must respond to the WM_NCCREATE message by returning TRUE. If it does not, the creation process will fail. A null handle will be returned from CreateWindowEx and GetLastError will return 0. See MSDN on WM_NCCREATE (http://msdn.microsoft.com/en-us/library/ms632635.aspx) and also WM_CREATE (http://msdn.microsoft.com/en-us/library/ms632619.aspx). You can have your WndProc call DefWindowProc, which will take care of this issue.

/// <returns>If the function succeeds, the return value is nonzero. If the function fails, the return value is zero. To get extended error information, call GetLastError.</returns>

''' <returns>If the function succeeds, the return value is nonzero. If the function fails, the return value is zero. To get extended error information, call GetLastError.</returns>

If the clipboard is not owned, the return value is NULL. To get extended error information, call GetLastError.

Windows NT/2000/XP: To get extended error information, call GetLastError.

Windows NT/2000/XP: To get extended error information, call GetLastError.

static extern TODO GetLastError(TODO);

Declare Function GetLastError Lib "kernel32.dll" (TODO) As TODO

    int nLatError = GetLastError(); // in kernel32.dll

/// If the function fails, the return value is zero. To get extended error information, call GetLastError.

///     call GetLastError.

///     <br />To get extended error information, call GetLastError.

    ''' <para>If the function fails, the return value is zero. To get extended error information, call GetLastError.</para></returns>

MSDN says: If the function fails, the return value is zero. To get extended error information, call GetLastError.

///     information, call GetLastError.

/// <para>Windows Vista: RemoveProp is subject to the restrictions of User Interface Privilege Isolation (UIPI). A process can only call this function on a window belonging to a process of lesser or equal integrity level. When UIPI blocks property changes, GetLastError will return 5.</para>

/// <para>Windows Vista: SetProp is subject to the restrictions of User Interface Privilege Isolation (UIPI). A process can only call this function on a window belonging to a process of lesser or equal integrity level. When UIPI blocks property changes, GetLastError will return 5.</para>

/// <returns>If the data handle and string are added to the property list, the return value is nonzero. If the function fails, the return value is zero. To get extended error information, call GetLastError.</returns>

/// If the function fails, the return value is zero. To get extended error information, call GetLastError.