'id return 1 status' error message.

[selenium]

#ifndef UNICODE
#define UNICODE
#endif 

#include <windows.h>

LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);

int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE, PWSTR pCmdLine, int nCmdShow)
{
    // Register the window class.
    const wchar_t CLASS_NAME[]  = L"Sample Window Class";
    
    WNDCLASS wc = { };

    wc.lpfnWndProc   = WindowProc;
    wc.hInstance     = hInstance;
    wc.lpszClassName = CLASS_NAME;

    RegisterClass(&wc);

    // Create the window.

    HWND hwnd = CreateWindowEx(
        0,                              // Optional window styles.
        CLASS_NAME,                     // Window class
        L"Learn to Program Windows",    // Window text
        WS_OVERLAPPEDWINDOW,            // Window style

        // Size and position
        CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,

        NULL,       // Parent window    
        NULL,       // Menu
        hInstance,  // Instance handle
        NULL        // Additional application data
        );

    if (hwnd == NULL)
    {
        return 0;
    }

    ShowWindow(hwnd, nCmdShow);

    // Run the message loop.

    MSG msg = { };
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return 0;
}

LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch (uMsg)
    {
    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;

    case WM_PAINT:
        {
            PAINTSTRUCT ps;
            HDC hdc = BeginPaint(hwnd, &ps);

            FillRect(hdc, &ps.rcPaint, (HBRUSH) (COLOR_WINDOW+1));

            EndPaint(hwnd, &ps);
        }
        return 0;

    }
    return DefWindowProc(hwnd, uMsg, wParam, lParam);
}

I just started to learn the window programming, and the following code is copied from this url http://msdn.microsoft.com/en-us/library/windows/desktop/ff381409%28v=vs.85%29.aspx

But my compiler return the following error message:

[Linker error] undefined reference to `WinMain@16'
ld returned 1 exit status

my c++ is 4.9.9.2, using Window 7

[Moschops]

my c++ is 4.9.9.2

I guess what you actually mean is that you're using Dev-Cpp version 4.9.9.2, which is a very bad idea and something you should stop doing as soon as possible. It comes with an old, out-of-date C++ compiler and has various other problems.

Anyway, your problem here is that you don't have a main or a WinMain, and your compiler wants one. http://stackoverflow.com/questions/5259714/undefined-reference-to-winmain16

The page you linked to contains a solution in the comments, but a better solution would be to get an up-to-date compiler and to start your Win32 coding with something like http://www.winprog.org/tutorial/