299 lines
7.6 KiB
C
299 lines
7.6 KiB
C
/****************************************************************************
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*
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* File : multimed.c
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*
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* Description :
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* Top level control panel applet code for multimedia for
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* Windows NT
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*
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* Copyright (c) 1993 Microsoft Corporation
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*
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*****************************************************************************/
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/*****************************************************************************
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Design
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This module contains the code and data (apart from the icons for
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the 3 applets) to support 3 control panel applets for multi-media :
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sound - Setting system sounds
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midimap - Midi mapper
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drivers - Installation and configuration of installable drivers through
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installable drivers interface
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The interface in is as for all control panel applets. This (super)
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applet returns a number of internal applets to the CPL_GETCOUNT
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message depending on :
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waveOutGetNumDevs returns non-zero - then sound is supported.
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midiOutGetNumDevs returns non-zero or midiInGetNumDevs returns
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non-zero - then midimap is supported.
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Interface to sub-applets. For packaging and historical reasons the
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other applets are separate files :
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sound - sound.dll
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midimap - midimap.dll - is also a midi driver
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drivers - drivers.dll
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When an applet (which is supported for the current configuration of
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the system as determined above) is run (and ONLY THEN) via the
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CPL_DBLCLK message we call LoadLibrary for the (sub) applet and
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call its entry point (usually a 'cut-down' CplApplet).
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To do this each sub-applet's icon and string have fixed ids defined in
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multimed.h.
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*****************************************************************************/
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#include <windows.h>
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#include <mmsystem.h>
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#include <cpl.h>
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#include <cphelp.h>
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#include "multimed.h"
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// This applet has been neutered to provide only MIDIMAP.DLL's CPL
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// interface; the others are now supported by MMSYS.CPL.
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//
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// #define EXTRA_APPLETS
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#ifdef EXTRA_APPLETS
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enum {
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SoundsApplet = 0,
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DriversApplet,
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MidiMapApplet,
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ACMApplet,
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NumberOfApplets
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};
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struct {
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LPCTSTR AppletFileName;
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DWORD dwHelpContext;
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HINSTANCE ActiveHandle;
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APPLET_PROC AppletEntryPoint;
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BOOL AppInUse;
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NEWCPLINFO CplInfo;
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}
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AppletInfo[] = { { TEXT("sound.dll"), IDH_CHILD_SND },
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{ TEXT("drivers.dll"), IDH_CHILD_DRIVERS },
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{ TEXT("midimap.dll"), IDH_CHILD_MIDI },
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{ TEXT("msacm32.drv"), 0 } }; // No context for ACM
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#else
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enum {
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MidiMapApplet = 0,
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NumberOfApplets
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};
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struct {
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LPCTSTR AppletFileName;
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DWORD dwHelpContext;
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HINSTANCE ActiveHandle;
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APPLET_PROC AppletEntryPoint;
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BOOL AppInUse;
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NEWCPLINFO CplInfo;
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}
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AppletInfo[] = { { TEXT("midimap.dll"), IDH_CHILD_MIDI } };
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#endif
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int IdMapping[NumberOfApplets];
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int TotalApplets;
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BOOL LoadDataPart(int AppletIndex)
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{
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UINT OldErrorMode;
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LPNEWCPLINFO lpCplInfo;
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HINSTANCE DataOnlyHandle;
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OldErrorMode = SetErrorMode(SEM_FAILCRITICALERRORS);
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DataOnlyHandle =
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LoadLibraryEx(AppletInfo[AppletIndex].AppletFileName,
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NULL,
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DONT_RESOLVE_DLL_REFERENCES);
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SetErrorMode(OldErrorMode);
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if (DataOnlyHandle == NULL) {
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return FALSE;
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}
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/*
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* Cache all Cpl data now so we're not embarrassed by errors later
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*/
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lpCplInfo = &AppletInfo[AppletIndex].CplInfo;
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lpCplInfo->dwSize = sizeof(NEWCPLINFO);
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lpCplInfo->lData = 0; // Applets we use expect this
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lpCplInfo->dwHelpContext = AppletInfo[AppletIndex].dwHelpContext;
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lpCplInfo->hIcon =
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LoadIcon(DataOnlyHandle,
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MAKEINTRESOURCE(ID_ICON));
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if (lpCplInfo->hIcon == NULL ||
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!LoadString(DataOnlyHandle,
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IDS_NAME,
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lpCplInfo->szName,
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sizeof(lpCplInfo->szName)) ||
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!LoadString(DataOnlyHandle,
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IDS_INFO,
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lpCplInfo->szInfo,
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sizeof(lpCplInfo->szInfo)) ||
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!LoadString(DataOnlyHandle,
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IDS_CONTROL_HLP,
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lpCplInfo->szHelpFile,
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sizeof(lpCplInfo->szHelpFile))) {
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FreeLibrary(DataOnlyHandle);
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return FALSE;
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}
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FreeLibrary(DataOnlyHandle);
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return TRUE;
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}
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LONG CPlApplet(HWND hCplWnd, UINT uMsg, LPARAM lParam1, LPARAM lParam2)
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{
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LONG ReturnCode = 0L; // The default apparently
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int i;
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switch (uMsg) {
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case CPL_INIT:
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/*
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* I've no idea why this is a better place to initialize than
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* CPL_GETCOUNT but why not?
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*
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*/
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/*
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* Check there's somebody home
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*/
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for (i = 0; i < NumberOfApplets; i++) {
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/*
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** Don't put up useless junk!
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*/
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if (i == MidiMapApplet && midiOutGetNumDevs() == 0
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#ifdef EXTRA_APPLETS
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|| i == ACMApplet && waveOutGetNumDevs() == 0
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#endif
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)
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{
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continue;
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}
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if (LoadDataPart(i)) {
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IdMapping[TotalApplets++] = i;
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}
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}
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/*
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* Only succeed if we support something
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*/
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ReturnCode = TotalApplets != 0;
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break;
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case CPL_GETCOUNT:
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return TotalApplets;
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break;
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case CPL_NEWINQUIRE:
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{
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LPNEWCPLINFO lpCplInfo;
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int iApplet;
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iApplet = IdMapping[lParam1];
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lpCplInfo = (LPNEWCPLINFO)lParam2;
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*lpCplInfo = AppletInfo[iApplet].CplInfo;
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}
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break;
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case CPL_DBLCLK:
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/*
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* The job here is to
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* 1. If the applet is not already loaded
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* -- load it
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* -- Pass it a cpl_init message - this will do for our applets(!)
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*
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* 2. Pass it a CPL_DBLCLK message with the parameters we got
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*
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*/
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{
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int iApplet;
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iApplet = IdMapping[lParam1];
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if (AppletInfo[iApplet].ActiveHandle == NULL) {
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UINT OldErrorMode;
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OldErrorMode = SetErrorMode(SEM_FAILCRITICALERRORS);
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AppletInfo[iApplet].ActiveHandle =
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LoadLibrary(AppletInfo[iApplet].AppletFileName);
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SetErrorMode(OldErrorMode);
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if (AppletInfo[iApplet].ActiveHandle != NULL) {
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AppletInfo[iApplet].AppletEntryPoint =
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(APPLET_PROC)GetProcAddress(
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AppletInfo[iApplet].ActiveHandle,
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"CPlApplet");
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}
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if (AppletInfo[iApplet].AppletEntryPoint != NULL) {
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(*AppletInfo[iApplet].AppletEntryPoint)
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(hCplWnd, CPL_INIT, 0, 0);
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}
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}
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if (AppletInfo[iApplet].AppletEntryPoint != NULL) {
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(*AppletInfo[iApplet].AppletEntryPoint)
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(hCplWnd, uMsg, lParam1, lParam2);
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}
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}
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break;
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case CPL_EXIT:
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/*
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* Unload all our friends
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*/
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{
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int i;
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for (i = 0; i < NumberOfApplets; i++) {
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if (AppletInfo[i].ActiveHandle != NULL) {
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if (AppletInfo[i].AppletEntryPoint != NULL) {
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(*AppletInfo[i].AppletEntryPoint)
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(hCplWnd, CPL_EXIT, 0, 0);
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}
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FreeLibrary(AppletInfo[i].ActiveHandle);
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}
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}
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}
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break;
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}
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return ReturnCode;
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}
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