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Код

#include "windows.h"
#include "windowsx.h"

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

int WINAPI WinMain(HINSTANCE hInst, HINSTANCE, LPSTR , int)
{
    char szTitle[] = "Title";
    char szClassName[] = "Window";
    MSG msg;
    WNDCLASS wc;
    ZeroMemory(&wc, sizeof(wc));
    wc.style=wc.cbClsExtra=wc.cbWndExtra=0;
    wc.lpfnWndProc=WndProc;
    wc.hInstance=hInst;
    wc.hCursor=LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground=GetStockBrush(LTGRAY_BRUSH);
    wc.lpszMenuName=NULL;
    wc.lpszClassName=szClassName;          //ERROR
    RegisterClass(&wc);

    HWND hwnd=CreateWindow(szClassName, szTitle,                   //ERROR
                                           WS_OVERLAPPEDWINDOW | WS_VISIBLE,
        CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
        0, 0, hInst, NULL);
    ShowWindow(hwnd, SW_SHOWNORMAL);
    while (GetMessage(&msg, NULL, 0, 0))
        DispatchMessage(&msg);
    return 0;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    switch(msg)
    {
    case WM_DESTROY:
        {
            PostQuitMessage(0);
            return 0;
        }
    default:
        return DefWindowProc(hwnd, msg, wParam, lParam);
    }
}