//+---------------------------------------------------------------------------////  HELLO_WIN.C - Windows GUI 'Hello World!' Example////+--------------------------------------------------------------------------- #include <windows.h> #define APPNAME "HELLO_WIN" char szAppName[] = APPNAME; // The name of this applicationchar szTitle[]   = APPNAME; // The title bar textconst char *pWindowText; void CenterWindow(HWND hWnd); //+---------------------------------------------------------------------------////  Function:   WndProc////  Synopsis:   very unusual type of function - gets called by system to//              process windows messages.////  Arguments:  same as always.//---------------------------------------------------------------------------- LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam){    switch (message) {         // ----------------------- first and last        case WM_CREATE:            CenterWindow(hwnd);            break;         case WM_DESTROY:            PostQuitMessage(0);            break;         // ----------------------- get out of it...        case WM_RBUTTONUP:            DestroyWindow(hwnd);            break;         case WM_KEYDOWN:            if (VK_ESCAPE == wParam)                DestroyWindow(hwnd);            break;         // ----------------------- display our minimal info        case WM_PAINT:        {            PAINTSTRUCT ps;            HDC         hdc;            RECT        rc;            hdc = BeginPaint(hwnd, &ps);             GetClientRect(hwnd, &rc);            SetTextColor(hdc, RGB(240,240,96));            SetBkMode(hdc, TRANSPARENT);            DrawText(hdc, pWindowText, -1, &rc, DT_CENTER|DT_SINGLELINE|DT_VCENTER);             EndPaint(hwnd, &ps);            break;        }         // ----------------------- let windows do all other stuff        default:            return DefWindowProc(hwnd, message, wParam, lParam);    }    return 0;} //+---------------------------------------------------------------------------////  Function:   WinMain////  Synopsis:   standard entrypoint for GUI Win32 apps////----------------------------------------------------------------------------int APIENTRY WinMain(        HINSTANCE hInstance,        HINSTANCE hPrevInstance,        LPSTR lpCmdLine,        int nCmdShow        ){    MSG msg;    WNDCLASS wc;    HWND hwnd;     pWindowText = lpCmdLine[0] ? lpCmdLine : "Hello Windows!";     // Fill in window class structure with parameters that describe    // the main window.     ZeroMemory(&wc, sizeof wc);    wc.hInstance     = hInstance;    wc.lpszClassName = szAppName;    wc.lpfnWndProc   = (WNDPROC)WndProc;    wc.style         = CS_DBLCLKS|CS_VREDRAW|CS_HREDRAW;    wc.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);    wc.hIcon         = LoadIcon(NULL, IDI_APPLICATION);    wc.hCursor       = LoadCursor(NULL, IDC_ARROW);     if (FALSE == RegisterClass(&wc))        return 0;     // create the browser    hwnd = CreateWindow(        szAppName,        szTitle,        WS_OVERLAPPEDWINDOW|WS_VISIBLE,        CW_USEDEFAULT,        CW_USEDEFAULT,        360,//CW_USEDEFAULT,        240,//CW_USEDEFAULT,        0,        0,        hInstance,        0);     if (NULL == hwnd)        return 0;     // Main message loop:    while (GetMessage(&msg, NULL, 0, 0) > 0) {        TranslateMessage(&msg);        DispatchMessage(&msg);    }     return msg.wParam;} //+--------------------------------------------------------------------------- //+--------------------------------------------------------------------------- void CenterWindow(HWND hwnd_self){    HWND hwnd_parent;    RECT rw_self, rc_parent, rw_parent;    int xpos, ypos;     hwnd_parent = GetParent(hwnd_self);    if (NULL == hwnd_parent)        hwnd_parent = GetDesktopWindow();     GetWindowRect(hwnd_parent, &rw_parent);    GetClientRect(hwnd_parent, &rc_parent);    GetWindowRect(hwnd_self, &rw_self);     xpos = rw_parent.left + (rc_parent.right + rw_self.left - rw_self.right) / 2;    ypos = rw_parent.top + (rc_parent.bottom + rw_self.top - rw_self.bottom) / 2;     SetWindowPos(        hwnd_self, NULL,        xpos, ypos, 0, 0,        SWP_NOSIZE|SWP_NOZORDER|SWP_NOACTIVATE        );} //+---------------------------------------------------------------------------