UTIL.C

//+--------------------------------------------------------------------------- 
// 
//  Microsoft Windows 
//  Copyright 1992 - 1998 Microsoft Corporation. 
// 
//  File:       util.c 
// 
//  Contents: 
// 
//  Classes: 
// 
//  Functions: 
// 
//  History:    4-20-95   RichardW   Created 
// 
//---------------------------------------------------------------------------- 
 
#include "gina.h" 
#pragma hdrstop 
 
HMODULE hNetMsg = NULL; 
 
//+--------------------------------------------------------------------------- 
// 
//  Function:   CenterWindow 
// 
//  Synopsis:   Centers a window 
// 
//  Arguments:  [hwnd] -- 
// 
//  Notes: 
// 
//---------------------------------------------------------------------------- 
VOID 
CenterWindow( 
    HWND    hwnd 
    ) 
{ 
    RECT    rect; 
    LONG    dx, dy; 
    LONG    dxParent, dyParent; 
    LONG    Style; 
 
    // Get window rect 
    GetWindowRect(hwnd, &rect); 
 
    dx = rect.right - rect.left; 
    dy = rect.bottom - rect.top; 
 
    // Get parent rect 
    Style = GetWindowLong(hwnd, GWL_STYLE); 
    if ((Style & WS_CHILD) == 0) { 
 
        // Return the desktop windows size (size of main screen) 
        dxParent = GetSystemMetrics(SM_CXSCREEN); 
        dyParent = GetSystemMetrics(SM_CYSCREEN); 
    } else { 
        HWND    hwndParent; 
        RECT    rectParent; 
 
        hwndParent = GetParent(hwnd); 
        if (hwndParent == NULL) { 
            hwndParent = GetDesktopWindow(); 
        } 
 
        GetWindowRect(hwndParent, &rectParent); 
 
        dxParent = rectParent.right - rectParent.left; 
        dyParent = rectParent.bottom - rectParent.top; 
    } 
 
    // Centre the child in the parent 
    rect.left = (dxParent - dx) / 2; 
    rect.top  = (dyParent - dy) / 3; 
 
    // Move the child into position 
    SetWindowPos(hwnd, HWND_TOPMOST, rect.left, rect.top, 0, 0, SWP_NOSIZE); 
 
    SetForegroundWindow(hwnd); 
} 
 
 
int 
ErrorMessage( 
    HWND        hWnd, 
    PWSTR       pszTitleBar, 
    DWORD       Buttons) 
{ 
    WCHAR   szMessage[256]; 
    DWORD   GLE; 
 
    GLE = GetLastError(); 
 
    if (GLE >= NERR_BASE) 
    { 
        if (!hNetMsg) 
        { 
            hNetMsg = LoadLibrary(TEXT("netmsg.dll")); 
        } 
        FormatMessage( 
            FORMAT_MESSAGE_FROM_HMODULE | FORMAT_MESSAGE_IGNORE_INSERTS, 
            hNetMsg,                               // ignored 
            GLE,                                  // message id 
            MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US),   // message language 
            szMessage,                  // address of buffer pointer 
            199,                                  // minimum buffer size 
            NULL );                              // no other arguments 
 
    } 
 
    FormatMessage( 
            FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, 
            NULL,                               // ignored 
            (GetLastError()),                     // message id 
            MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US),   // message language 
            szMessage,                  // address of buffer pointer 
            199,                                  // minimum buffer size 
            NULL );                              // no other arguments 
 
    return(MessageBox(hWnd, szMessage, pszTitleBar, Buttons)); 
 
}