failing RegisterClass

This is my first go at unicode and I thought I may as well do a little windows skeleton so I wouldn't have to keep recreating it. Well here is my attempt but It always gives me the message box "This program requires Windows NT"
What did I do incorrectly? I have been looking this over all evening and still can't find anything wrong with this. Hopefully it is something painfully obvious!
I'm using MSVC 2003 on XP Pro.

Code:

#define UNICODE
#define _UNICODE

#include <windows.h>

HINSTANCE hInstance;
HDC hdc;
PAINTSTRUCT ps;

LRESULT CALLBACK WndProc( HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR lpszCmdLine, int iCmdShow)
{
    static TCHAR szAppName[] = TEXT ("Win32Skeleton");
    HWND        hwnd;
    MSG            msg;
    WNDCLASS    wndclass;

    wndclass.style            = CS_HREDRAW | CS_VREDRAW;
    wndclass.lpfnWndProc    = WndProc;
    wndclass.cbClsExtra        = 0;
    wndclass.cbClsExtra        = 0;
    wndclass.hInstance        = hInstance;
    wndclass.hIcon            = LoadIcon (NULL, IDI_APPLICATION);
    wndclass.hCursor        = LoadCursor (NULL, IDC_CROSS);
    wndclass.hbrBackground    = (HBRUSH) GetStockObject (WHITE_BRUSH);
    wndclass.lpszMenuName    = NULL;
    wndclass.lpszClassName    = szAppName;

    if(!RegisterClass (&wndclass))
    {
        MessageBox(NULL, TEXT ("This program requires Windows NT!")
            , szAppName, MB_ICONERROR);
        return 0;
    }

    hwnd = CreateWindow(szAppName, TEXT ("SkeletonDoesn'tWork")
        , WS_OVERLAPPEDWINDOW
        , CW_USEDEFAULT, CW_USEDEFAULT
        , CW_USEDEFAULT, CW_USEDEFAULT
        , NULL, NULL, hInstance, NULL);

    ShowWindow(hwnd, iCmdShow);
    UpdateWindow(hwnd);

    while (GetMessage (&msg, NULL, 0, 0))
    {
        TranslateMessage (&msg);
        DispatchMessage (&msg);
    }
    return (int) msg.wParam;
}

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch(message)
    {
    case WM_CREATE:
        return 0;
    }

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

You should be able to set/unset unicode in your project properties. I think it's under the general category just above debugging.

Check your project properties as well to fix the other issue. I'm not sure why it's saying that right off hand.

Call GetLastError() to get more error information. This might lead you to the problem.

I set it up for UNICODE in my project options.

GetLastError:
RegisterClass failed with error 87 The parameter is incorrect

Thanks for your help but I still don't get it! How can the parameter be incorrect?

I fixed it by using:

Code:

ZeroMemory(&wndclass,sizeof(WNDCLASS));

Thanks for you help!

It's always a good idea to zero out structs so you don't send junk data to APIs and functions.

I always prefer this method:

Code:

WNDCLASS    wndclass = {0}; //No silly crt memset function