Окно приложения создается и зависает

#include <Windows.h>
 
LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    switch (msg)
    {
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    }
    return DefWindowProc(hWnd, msg, wParam, lParam);
}
 
int _stdcall WinMain(HINSTANCE hInstance, HINSTANCE h2, LPSTR cmd, int cmShow)
{
    WNDCLASS wc = { 0 };
 
    wc.style = CS_HREDRAW | CS_VREDRAW;
    wc.lpfnWndProc = WndProc;
    wc.cbClsExtra = 0;
    wc.cbWndExtra = 0;
    wc.hInstance = hInstance;
    wc.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_APPLICATION));
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
    wc.lpszMenuName = NULL;
    wc.lpszClassName = TEXT("Myclass");
    RegisterClass(&wc);
    
    HWND hWnd = CreateWindow(wc.lpszClassName, TEXT("My Win8 FORM"), WS_OVERLAPPEDWINDOW | WS_VISIBLE, 100, 100, 500, 500, 0, 0, hInstance, 0);
 
    MSG msg;
    while (GetMessage) {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return 0;
}

wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);

while (GetMessage(&msg, NULL, 0, 0)) {

ShowWindow(hWnd, cmShow);

if (!RegisterClass(&wc))
{
    MessageBox(NULL, TEXT("Класс не зарегистрирован!"), TEXT("Ошибка!"), MB_OK);
    return -1;
}
...........
HWND hWnd = CreateWindow(bla-bla-bla);
if (hWnd == NULL)
{
    MessageBox(NULL, TEXT("Окно не создано!"), TEXT("Ошибка!"), MB_OK);
    return -1;
}