127 lines
4.1 KiB
C
127 lines
4.1 KiB
C
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/***
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*crtmbox.c - CRT MessageBoxA wrapper.
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*
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* Copyright (c) 1995-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* Wrap MessageBoxA.
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*
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*Revision History:
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* 02-24-95 CFW Module created.
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* 02-27-95 CFW Move GetActiveWindow/GetLastActivePopup to here.
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* 05-17-99 PML Remove all Macintosh support.
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* 09-16-00 PML Use MB_SERVICE_NOTIFICATION from services (vs7#123291)
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*
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*******************************************************************************/
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#undef _WIN32_WINNT
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#define _WIN32_WINNT 0x0400 /* for MB_SERVICE_NOTIFICATION */
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#include <windows.h>
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#include <stdlib.h>
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#include <awint.h>
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/***
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*__crtMessageBox - call MessageBoxA dynamically.
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*
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*Purpose:
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* Avoid static link with user32.dll. Only load it when actually needed.
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*
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*Entry:
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* see MessageBoxA docs.
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*
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*Exit:
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* see MessageBoxA docs.
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*
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*Exceptions:
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*
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*******************************************************************************/
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int __cdecl __crtMessageBoxA(
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LPCSTR lpText,
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LPCSTR lpCaption,
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UINT uType
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)
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{
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typedef int (APIENTRY *PFNMessageBoxA)(HWND, LPCSTR, LPCSTR, UINT);
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typedef HWND (APIENTRY *PFNGetActiveWindow)(void);
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typedef HWND (APIENTRY *PFNGetLastActivePopup)(HWND);
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typedef HWINSTA (APIENTRY *PFNGetProcessWindowStation)(void);
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typedef BOOL (APIENTRY *PFNGetUserObjectInformationA)(HANDLE, int, PVOID, DWORD, LPDWORD);
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static PFNMessageBoxA pfnMessageBoxA = NULL;
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static PFNGetActiveWindow pfnGetActiveWindow = NULL;
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static PFNGetLastActivePopup pfnGetLastActivePopup = NULL;
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static PFNGetProcessWindowStation pfnGetProcessWindowStation = NULL;
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static PFNGetUserObjectInformationA pfnGetUserObjectInformationA = NULL;
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HWND hWndParent = NULL;
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BOOL fNonInteractive = FALSE;
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HWINSTA hwinsta;
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USEROBJECTFLAGS uof;
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DWORD nDummy;
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if (NULL == pfnMessageBoxA)
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{
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HANDLE hlib = LoadLibrary("user32.dll");
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if (NULL == hlib ||
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NULL == (pfnMessageBoxA = (PFNMessageBoxA)
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GetProcAddress(hlib, "MessageBoxA")))
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return 0;
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pfnGetActiveWindow = (PFNGetActiveWindow)
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GetProcAddress(hlib, "GetActiveWindow");
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pfnGetLastActivePopup = (PFNGetLastActivePopup)
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GetProcAddress(hlib, "GetLastActivePopup");
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if (_osplatform == VER_PLATFORM_WIN32_NT)
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{
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pfnGetUserObjectInformationA = (PFNGetUserObjectInformationA)
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GetProcAddress(hlib, "GetUserObjectInformationA");
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if (pfnGetUserObjectInformationA)
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pfnGetProcessWindowStation = (PFNGetProcessWindowStation)
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GetProcAddress(hlib, "GetProcessWindowStation");
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}
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}
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/*
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* If the current process isn't attached to a visible WindowStation,
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* (e.g. a non-interactive service), then we need to set the
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* MB_SERVICE_NOTIFICATION flag, else the message box will be
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* invisible, hanging the program.
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*
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* This check only applies to Windows NT-based systems (for which we
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* retrieved the address of GetProcessWindowStation above).
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*/
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if (pfnGetProcessWindowStation)
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{
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if (NULL == (hwinsta = (*pfnGetProcessWindowStation)()) ||
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!(*pfnGetUserObjectInformationA)
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(hwinsta, UOI_FLAGS, &uof, sizeof(uof), &nDummy) ||
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(uof.dwFlags & WSF_VISIBLE) == 0)
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{
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fNonInteractive = TRUE;
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}
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}
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if (fNonInteractive)
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{
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if (_winmajor >= 4)
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uType |= MB_SERVICE_NOTIFICATION;
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else
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uType |= MB_SERVICE_NOTIFICATION_NT3X;
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}
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else
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{
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if (pfnGetActiveWindow)
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hWndParent = (*pfnGetActiveWindow)();
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if (hWndParent != NULL && pfnGetLastActivePopup)
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hWndParent = (*pfnGetLastActivePopup)(hWndParent);
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}
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return (*pfnMessageBoxA)(hWndParent, lpText, lpCaption, uType);
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}
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