The following code is to select "Stereo Min" in the recording control. How to modify it, you can choose "microphone"

10394558

Project-> Link: winmm.lib
#include "mmsystem.h"


BOOL GetRecordradio ()
{
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UINT m_uMxId2;
// HWND m_hWnd; // Callback handle
HMIXER m_hmx2;
MIXERCAPS mxcaps;
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// Return the number of mixers in the system (e.g. a common sound card provides a mixer device)
int devnum = mixerGetNumDevs ();
int i = 0;
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for (i; i <devnum; i ++)
{
m_uMxId2 = i;
if (MMSYSERR_NOERROR! =
mixerOpen (&m_hmx2, m_uMxId2, NULL, 0, CALLBACK_WINDOW))
// use dwCallback parameter
return -1;
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// Get the corresponding device identification number
// mixerGetID ((HMIXEROBJ) m_hmx2,&m_uMxId, MIXER_OBJECTF_HMIXER);
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// Determine the capabilities of each mixer device: saved in the mxcaps structure (wMid, wPid, szname, cDestinations)
if (MMSYSERR_NOERROR! =
mixerGetDevCaps (m_uMxId2,&mxcaps, sizeof (MIXERCAPS)))
return FALSE;
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// Retrieve the information of the specified audio line and save it in the MIXERLINE structure,
// Some of these members need to be initialized according to different situations
MIXERLINE mxl;
mxl.cbStruct = sizeof (MIXERLINE); // Must be assigned
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// can be retrieved by multiple conditions:
// Method 1: According to the target unit number
//mxl.dwDestination=0; equivalent to mxl.dwComponentType = MIXERLINE_COMPONENTTYPE_DST_SPEAKERS
//mxl.dwDestination=1; equivalent mxl.dwComponentType = MIXERLINE_COMPONENTTYPE_DST_WAVEIN
// Corresponding flag: MIXER_GETLINEINFOF_DESTINATION
//mxl.dwDestination=1;
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// Method 2: According to the type of line
mxl.dwComponentType = MIXERLINE_COMPONENTTYPE_DST_WAVEIN;
// Corresponding flag: MIXER_GETLINEINFOF_COMPONENTTYPE
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if (:: mixerGetLineInfo ((HMIXEROBJ) m_hmx2,
&mxl,
MIXER_OBJECTF_HMIXER |
MIXER_GETLINEINFOF_COMPONENTTYPE)
! = MMSYSERR_NOERROR) return -1;
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// Query the number of the microphone line in the recording control panel
MIXERLINE mxl_v;
UINT cConnections = (UINT) mxl.cConnections;
UINT dwSource_v = 0;
do
{
mxl_v.cbStruct = sizeof (mxl_v);
mxl_v.dwDestination = mxl.dwDestination;
mxl_v.dwSource = dwSource_v;
dwSource_v ++;
if (MMSYSERR_NOERROR! =
mixerGetLineInfo ((HMIXEROBJ) m_hmx2,
&mxl_v,
MIXER_GETLINEINFOF_SOURCE))
return FALSE;
} while ((dwSource_v <cConnections)&&
(mxl_v.dwComponentType! = MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE));
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if ((dwSource_v> cConnections) ||
(mxl_v.dwComponentType! = MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE))
return FALSE;
dwSource_v-; // Get the number
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// The following text indicates that it has no practical meaning in this example, it was left in the previous debugging and will not be deleted.
// You can know how to control the muted state of the main line:
// --- can use the mxl.dwLineID of the obtained volume (Volume) line,
// To query the volume's silence status
// If you want to query (or set), you can mix it into the DST_SPEAKERS main volume (Volume)
// Relevant sound source lines (such as: wave, micphone, etc.) must be used again.
// One mixerGetLineInfo further specifies its dwLineID
// Note: Don't simply modify the above directly:
//mxl.dwComponentType = type;
// Although sometimes an error may not be reported, this has become a hidden danger in our program.
// Because some lines are available in DST_SPEAKERS and DST_WAVEIN, such as:
// MIXERLINE_COMPONENTTYPE_SRC_COMPACTDISC
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// The following implements a "mandatory" radio microphone input for the recording source
MIXERCONTROL mxc;
MIXERLINECONTROLS mxlc;
mxlc.cbStruct = sizeof (MIXERLINECONTROLS);
mxlc.dwLineID = mxl.dwLineID;
mxlc.dwControlType = MIXERCONTROL_CONTROLTYPE_MUX;
// MIXERCONTROL_CONTROLTYPE_MUTE;
mxlc.cControls = 1;
mxlc.cbmxctrl = sizeof (MIXERCONTROL);
mxlc.pamxctrl =&mxc; // In order to get the corresponding mxc.dwControlID,
        // Lock the line control specified by mxlc.dwLineID and mxlc.dwControlType
        // At present, the radio source line of the recording target unit will be selected (multiplexed)
if (:: mixerGetLineControls ((HMIXEROBJ) m_hmx2,
&mxlc,
MIXER_OBJECTF_HMIXER |
MIXER_GETLINECONTROLSF_ONEBYTYPE)
! = MMSYSERR_NOERROR) return -1;
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// Retrieve the line according to mxc.dwControlID,
MIXERCONTROLDETAILS_BOOLEAN mxcdMute [8];
MIXERCONTROLDETAILS mxcd;
mxcd.cbStruct = sizeof (MIXERCONTROLDETAILS);
mxcd.dwControlID = mxc.dwControlID; // Ouo0mxc above
mxcd.cChannels = 1;
mxcd.cMultipleItems = mxc.cMultipleItems; // Multiple number of factors
mxcd.cbDetails = sizeof (* mxcdMute);
mxcd.paDetails =&mxcdMute; // Store the search results
if (:: mixerGetControlDetails ((HMIXEROBJ) m_hmx2,
&mxcd,
MIXER_OBJECTF_HMIXER |
MIXER_GETCONTROLDETAILSF_VALUE)
! = MMSYSERR_NOERROR) return -1;
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// Make corresponding radio selection changes
int j;
for (j = 0; j <(int) mxc.cMultipleItems; j ++)
mxcdMute [j] .fValue = false;
mxcdMute [dwSource_v] .fValue = true;
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// Reset line control locked by dwControlID
if (:: mixerSetControlDetails ((HMIXEROBJ) m_hmx2,
&mxcd,
MIXER_OBJECTF_HMIXER |
MIXER_GETCONTROLDETAILSF_VALUE)
! = MMSYSERR_NOERROR) return -1;
} // for (i; i <devnum; i ++)
return TRUE;
}

10394558

I think the problem lies in the following piece of code, but how to modify it can not find the microphone number

UINT dwSource_v = 0;
do
{
mxl_v.cbStruct = sizeof (mxl_v);
mxl_v.dwDestination = mxl.dwDestination;
mxl_v.dwSource = dwSource_v;
dwSource_v ++;
if (MMSYSERR_NOERROR! =
mixerGetLineInfo ((HMIXEROBJ) m_hmx2,
&mxl_v,
MIXER_GETLINEINFOF_SOURCE))
return FALSE;
} while ((dwSource_v <cConnections)&&
(mxl_v.dwComponentType! = MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE));
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if ((dwSource_v> cConnections) ||
(mxl_v.dwComponentType! = MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE))
return FALSE;
dwSource_v-; // Get the number

wzd3529

//Make corresponding single-select changes
int j;
for(j=0;j<(int)mxc.cMultipleItems;j++)
mxcdMute[j].fValue=false;
mxcdMute[dwSource_v].fValue=true;

This paragraph is wrong...

wzd3529

The serial number is reverse...