mux/main.c

This is an example of how to use the ASX multiplexer control.

/* $Header: /Repository/apps/asx/examples/mux/main.c,v 1.5 2004/08/11 14:13:36 as-age Exp $ */
#include "stdio.h"
#include "stdlib.h"
#include "asx.h"
#include "asxstring.h"

int CheckError(ASX_HANDLE hObj, int nLine);
void PrintControlName(ASX_HANDLE hControl);

ASX_HANDLE hSystem=0;

int main(int argc, char* argv[])
{
    char *pszName;
    ASX_HANDLE hAdapter;
    ASX_HANDLE hMixer;
    ASX_HANDLE hMux;
    ASX_ERROR asxError;
    int nAdapterToUse=0;
    enum asxNODE eNode;
    int nNodeIndex;
    char szName[64];
    int nRequiredLength;
    int nCount;
    int i,nLen;

    // create the system
    ASX_System_Create(ASX_SYSTEM_TYPE_HPI,&hSystem);
    CheckError(hSystem, __LINE__);

    // get the adapter
    asxError = ASX_System_GetAdapter(hSystem,nAdapterToUse,&hAdapter);
    CheckError(hSystem, __LINE__);

    ASX_Adapter_GetName(hAdapter,0,0,&nLen);
    CheckError(hAdapter, __LINE__);
    pszName = (char *)malloc(nLen);
    ASX_Adapter_GetName(hAdapter,pszName,nLen,&nLen);
    CheckError(hAdapter, __LINE__);
    printf("Adapter [%d] is %s \n", nAdapterToUse,pszName);

    // get the mixer handle
    asxError = ASX_Adapter_GetMixer( hAdapter, &hMixer );
    CheckError(hAdapter, __LINE__);

    // get a multiplexer object
    asxError = ASX_Mixer_GetControlByNodeTypeAndIndex(
        hMixer,
        0,0,
        asxNODE_RECORDER,0,
        asxCONTROL_MULTIPLEXER,
        &hMux);
    CheckError(hMixer, __LINE__);
    // print out some control details
    PrintControlName(hMux);

    // Get the selector and print out available selections,
    asxError=0;
    i=0;
    while(!asxError)
    {

        asxError=ASX_Multiplexer_Enumerate( hMux, i,&eNode, &nNodeIndex, &nCount);
        if(i==0)
            printf("Multiplexer has total of %d options\n",nCount);
        
        if(!asxError)
        {
            ASXSTRING_EnumToString(eNode, szName, 64, &nRequiredLength);
            printf("Option[%d] is %s %d\n",i,szName,nNodeIndex);
            i++;
        }
    }


    // Get the current setting.
    asxError = ASX_Multiplexer_Get(hMux,&eNode,&nNodeIndex);
    ASXSTRING_EnumToString(eNode, szName, 64, &nRequiredLength);
    printf("Multiplexer currently set to enum %d, index %d, %s %d\n",eNode,nNodeIndex,szName,nNodeIndex);

    printf("Press ENTER to exit\n");
    getchar();
    ASX_System_Delete(hSystem);
    return 0;
}

void PrintControlName(ASX_HANDLE hControl)
{
    char *pszName;
    int nLen;
    enum asxCONTROL eControl;

    ASX_Control_GetType(hControl, &eControl);
    ASXSTRING_EnumToString(eControl,0,0,&nLen);
    pszName=(char *)malloc(nLen);
    ASXSTRING_EnumToString(eControl,pszName,nLen,&nLen);
    printf("Control : %s\n",pszName);

    free(pszName);
}

int CheckError(ASX_HANDLE hObj, int nLine)
{
    int nError;
    int asxSubSystemErrorCode=0;
    char *pszAsxErrorString;
    char *pszAsxSubSystemErrorString;
    int nLen1,nLen2;

    ASX_Error_GetLast( hObj, &nError, &asxSubSystemErrorCode);
    if(!nError)
        return 0;
    ASX_Error_GetLastString( hObj, 0,0,&nLen1,0,0,&nLen2);
    pszAsxErrorString = (char *)malloc(nLen1);
    pszAsxSubSystemErrorString = (char *)malloc(nLen2);
    ASX_Error_GetLastString( hObj, pszAsxErrorString,nLen1,&nLen1,pszAsxSubSystemErrorString,nLen2,&nLen2);
    printf("Error: #%d, %s - Subsystem Error: #%ld, %s \n",
        nError,
        pszAsxErrorString,
        asxSubSystemErrorCode,
        pszAsxSubSystemErrorString );
    printf("When called from source %s line %d\n",__FILE__,nLine);

    printf("Press ENTER to exit\n");
    getchar();
    free(pszAsxErrorString);
    free(pszAsxSubSystemErrorString);
    ASX_System_Delete(hSystem);
    exit(1);
    return 1;
}

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