Создать окно WinAPI

#include <windows.h>
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
    PSTR szCmdLine, int iCmdShow)
{
    static char szAppName[] = "EMF2";
    HWND hwnd;
    MSG msg;
    WNDCLASSEX wndclass;
    wndclass.cbSize = sizeof(wndclass);
    wndclass.style = CS_HREDRAW | CS_VREDRAW;
    wndclass.lpfnWndProc = WndProc;
    wndclass.cbClsExtra = 0;
    wndclass.cbWndExtra = 0;
    wndclass.hInstance = hInstance;
    wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
    wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
    wndclass.lpszMenuName = NULL;
    wndclass.lpszClassName = szAppName;
    wndclass.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
    RegisterClassEx(&wndclass);
    hwnd = CreateWindow(szAppName, "Metafile",
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, CW_USEDEFAULT,
        NULL, NULL, hInstance, NULL);
    ShowWindow(hwnd, iCmdShow);
    UpdateWindow(hwnd);
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return msg.wParam;
}
 
LRESULT CALLBACK WndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
    HDC hdc, hdcEMF;
    HENHMETAFILE hemf;
    PAINTSTRUCT ps;
    RECT rect;
    switch (iMsg)
    {
    case WM_CREATE:
        hdcEMF = CreateEnhMetaFile(NULL, "emf2.emf", NULL,
            "EMF2\0EMF Demo #2\0");
        Rectangle(hdcEMF, 100, 100, 200, 200);
        MoveToEx(hdcEMF, 100, 100, NULL);
        LineTo(hdcEMF, 200, 200);
        MoveToEx(hdcEMF, 200, 100, NULL);
        LineTo(hdcEMF, 100, 200);
        hemf = CloseEnhMetaFile(hdcEMF);
        DeleteEnhMetaFile(hemf);
        return 0;
    case WM_PAINT:
        hdc = BeginPaint(hwnd, &ps);
        GetClientRect(hwnd, &rect);
        rect.left = rect.right / 4;
        rect.right = 3 * rect.right / 4;
        rect.top = rect.bottom / 4;
        rect.bottom = 3 * rect.bottom / 4;
        hemf = GetEnhMetaFile("emf2.emf");
        PlayEnhMetaFile(hdc, hemf, &rect);
        DeleteEnhMetaFile(hemf);
        EndPaint(hwnd, &ps);
        return 0;
    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    }
    return DefWindowProc(hwnd, iMsg, wParam, lParam);
}

LPCSTR szClassName = "myclass";
LPCSTR szTitle = "window Title";

#include <tchar.h>
 
//....
LPTSTR szClassName = TEXT("myclass");
LPTSTR szTitle = TEXT("window Title");