/*
** compile with:
**
** gcc -o ComponentsExample ComponentsExample.m -framework Foundation -framework CoreServices -lobjc
*/

#import <Foundation/Foundation.h>
#import <CoreAudio/CoreAudio.h>
#import <AudioToolbox/AudioToolbox.h>


NSMutableArray *FindComponentsWithType(ComponentDescription *fcd)
{
  NSMutableArray *res;
  ComponentDescription ccd;
  Component cmp = NULL;
  Handle pName;
  char *cName;
  int len;

  res = [NSMutableArray arrayWithCapacity: 10];

  pName = NewHandle(0);
  while((cmp = FindNextComponent(cmp, fcd)) != 0) {
    GetComponentInfo(cmp, &ccd, pName, NULL, NULL);

    HLock(pName);

    cName = *pName;
    len = *cName++;
    cName[len] = 0;
    [res addObject: [NSString stringWithCString: cName]];

    HUnlock(pName);
  }
  DisposeHandle(pName);

  return(res);
}

Boolean FindComponentWithName(ComponentDescription *cd, NSString *Name)
{
  Boolean res = FALSE;
  char *name;
  ComponentDescription ccd, fcd;
  Component cmp = NULL;
  Handle pName;
  char *cName;
  int len;

  name = (char *)[Name cString];

  bzero(&fcd, sizeof(fcd));

  pName = NewHandle(0);
  while((cmp = FindNextComponent(cmp, &fcd)) != 0) {
    GetComponentInfo(cmp, &ccd, pName, NULL, NULL);

    HLock(pName);

    cName = *pName;
    len = *cName++;
    cName[len] = 0;

    if(strcmp(name, cName) == 0) {
      HUnlock(pName);
      DisposeHandle(pName);
      cd->componentManufacturer = ccd.componentManufacturer;
      cd->componentType = ccd.componentType;
      cd->componentSubType = ccd.componentSubType;
      cd->componentFlags = 0;
      cd->componentFlagsMask = 0;
      return(TRUE);
    }

    HUnlock(pName);
  }
  DisposeHandle(pName);

  return(res);
}

int main(int argc, char *argv[])
{
  NSMutableArray *List;
  ComponentDescription cd;
  char *name;
  NSString *str;
  int i, n;

  NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

  bzero(&cd, sizeof(ComponentDescription));
  cd.componentType = kAudioUnitType_MusicDevice;

  List = FindComponentsWithType(&cd);

  n = [List count];
  printf("---> %d objects found\n", n);

  for(i = 0; i < n; i++) {
    str = [List objectAtIndex: i];
    name = (char *)[str cString];
    printf("%d: >%s<\n", i, name);
  }

  printf("\n");

  str = [NSString stringWithCString: "Apple: DLSMusicDevice"];

  printf("The >%s< unit was ", [str cString]);

  if(FindComponentWithName(&cd, str))
    printf("found!\n");
  else
    printf("NOT FOUND!\n");

  [pool release];

  return(0);
}