|
waveOutOpen
The waveOutOpen function opens the given waveform-audio output device for playback.
MMRESULT waveOutOpen(
LPHWAVEOUT phwo,
|
| UINT uDeviceID,
|
| LPWAVEFORMATEX pwfx,
|
| DWORD dwCallback,
|
| DWORD dwCallbackInstance,
|
| DWORD fdwOpen
|
| );
|
|
Parameters
phwo
Address filled with a handle identifying the open waveform-audio output
device. Use the handle to identify the device when calling other waveform-audio
output functions. This parameter might be NULL if the WAVE_FORMAT_QUERY flag is
specified for fdwOpen.
uDeviceID
Identifier of the waveform-audio output device to open. It can be either a
device identifier or a handle of an open waveform-audio input device.You can use
the following flag instead of a device identifier:
WAVE_MAPPER
The function selects a waveform-audio output device capable of playing the
given format.
pwfx
Address of a WAVEFORMATEX structure that identifies the format of the waveform-audio data to be sent to
the device. You can free this structure immediately after passing it to waveOutOpen.
dwCallback
Address of a fixed callback function, an event handle, a handle to a window,
or the identifier of a thread to be called during waveform-audio playback to
process messages related to the progress of the playback. If no callback function
is required, this value can be zero. For more information on the callback
function, see waveOutProc.
dwCallbackInstance
User-instance data passed to the callback mechanism. This parameter is not
used with the window callback mechanism.
fdwOpen
Flags for opening the device. The following values are defined:
CALLBACK_EVENT
The dwCallback parameter is an event handle.
CALLBACK_FUNCTION
The dwCallback parameter is a callback procedure address.
CALLBACK_NULL
No callback mechanism. This is the default setting.
CALLBACK_THREAD
The dwCallback parameter is a thread identifier.
CALLBACK_WINDOW
The dwCallback parameter is a window handle.
WAVE_ALLOWSYNC
If this flag is specified, a synchronous waveform-audio device can be opened.
If this flag is not specified while opening a synchronous driver, the device
will fail to open.
WAVE_FORMAT_DIRECT
If this flag is specified, the ACM driver does not perform conversions on the
audio data.
WAVE_FORMAT_QUERY
If this flag is specified, waveOutOpen queries the device to determine if it supports the given format, but the
device is not actually opened.
WAVE_MAPPED
If this flag is specified, the uDeviceID parameter specifies a waveform-audio device to be mapped to by the wave
mapper.
Return Values
Returns MMSYSERR_NOERROR if successful or an error otherwise. Possible error
values include the following:
MMSYSERR_ALLOCATED
| Specified resource is already allocated.
| MMSYSERR_BADDEVICEID
| Specified device identifier is out of range.
| MMSYSERR_NODRIVER
| No device driver is present.
| MMSYSERR_NOMEM
| Unable to allocate or lock memory.
| WAVERR_BADFORMAT
| Attempted to open with an unsupported waveform-audio format.
| WAVERR_SYNC
| The device is synchronous but waveOutOpen was called without using the WAVE_ALLOWSYNC flag.
|
Remarks
Use the waveOutGetNumDevs function to determine the number of waveform-audio output devices present in
the system. If the value specified by the uDeviceID parameter is a device identifier, it can vary from zero to one less than the
number of devices present. The WAVE_MAPPER constant can also be used as a
device identifier.
The structure pointed to by pwfx can be extended to include type-specific information for certain data
formats. For example, for PCM data, an extra UINT is added to specify the number of bits per sample. Use the PCMWAVEFORMAT structure in this case. For all other waveform-audio formats, use the WAVEFORMATEX structure to specify the length of the additional data.
If you choose to have a window or thread receive callback information, the
following messages are sent to the window procedure function to indicate the
progress of waveform-audio output: MM_WOM_OPEN, MM_WOM_CLOSE, and MM_WOM_DONE.
If you choose to have a function receive callback information, the following
messages are sent to the function to indicate the progress of waveform-audio
output: WOM_OPEN, WOM_CLOSE, and WOM_DONE.
See Also
WAVEFORMATEX, waveOutGetNumDevs, waveOutProc, PCMWAVEFORMAT, MM_WOM_OPEN, MM_WOM_CLOSE, MM_WOM_DONE
| Last news from Greatis Software |
 |
|
Nostalgia .Net |
|
.Net is powerful, but not all-powerful, so sometimes we need to use Win32 API for our .Net applications. It's simple enough with Platform Invoke if you have Win32 skill, but we do not always have time to dig the ancient documentation, declare the special types that are compatible with Win32, find the values of the Win32's constants and so on. Nostalgia .Net offers several simple-to-use classes, and components that will allow you to forget about the headache of Win32 and just use the power of Win32 in your application the same way as you use the native. Net classes. More » |
| Recommended software for developers |
 |
|
Ultimate Pack |
|
Component pack for Delphi and C++ Builder that contains runtime form designer, runtime object inspector, print suite and much more for the very special price. More » |
 |
|
Form Designer .Net |
|
Unique runtime form design solution that allows to edit any form in .Net WinForms application at runtime with full source codes for only 300 euro! More » |
 |
|
Print Suite .Net |
|
Print Suite .Net is a set of components for easy printing texts, images and grids from your WinForms applications. Full C# source codes are available More » |
 |
|
Gradient Controls .Net |
|
Gradient Controls .Net offers controls with gradient background feature. Labels, panels and so on... Full C# source codes are available More » |
 |
|
Greatis iGrid |
|
iGrid plots drawing grid right over your desktop, so you can use it everywhere, with any drawing application without any special plugins for different graphic editors. More » |
All the contacts and projectsDmitry Vasiliev (just.dmitry)
Related LinksSoftware for Visual Studio .NET developers
Software for Delphi and C++ Builder developers
Software for Visual Basic 6 developers
Delphi Tips&Tricks
MegaDetailed.NET More Online Helps Win32 Programmer's Reference
Win32 Multimedia Programmer's Reference
OLE Programmer's Reference
Microsoft Windows Pen API Programmer's Reference
Microsoft Windows Sockets 2 Reference
Microsoft Windows Telephony API (TAPI) Programmer's Reference
Unix Manual Pages
|
