读取系统中注册的串口

来源：互联网发布：八千湘女上天山知乎编辑：程序博客网时间：2024/05/21 17:49

系统中有多少串口可以使用？串口必须在系统中注册，所以打开注册表找到相关

的键值就可以。下面是一个打开注册表并读取数值的函数。
// 返回值为串口数量
//返回strComArray为串口名
int CComDemoDlg::GetComName(CString * strComArray)
{
int i=0;
if(!(GetVersion() & 0x80000000))
{// Windows NT code
  HKEY hHardwareKey;//, hControlKey;
  long lRc;
  DWORD dwDataType,dwLength, dwIndex, dwValueName;
  char cValueName[50];
  lRc = RegOpenKeyEx(HKEY_LOCAL_MACHINE,
   "HARDWARE//DEVICEMAP//SERIALCOMM",
   0,
   KEY_READ,
   &hHardwareKey);

  if(lRc != ERROR_SUCCESS)
   return -1;//打开注册表失败!
  //
  char cCheckName[10]={0};

  //
  for(dwIndex = 0; ; dwIndex++)
  {
   dwLength = 10;
   dwValueName = sizeof(cValueName);
   lRc = RegEnumValue(
    hHardwareKey,   // handle to key to

query
dwIndex, // index of

value to query
cValueName, // address of

buffer for value string
&dwValueName, // address for size of

value buffer
NULL, // reserved
&dwDataType, // address of buffer

for type code
(unsigned char *)cCheckName, //

address of buffer for value data
&dwLength

// address for size of data buffer
    );
   //
   if(lRc != ERROR_SUCCESS)
   {
    RegCloseKey(hHardwareKey);
    return i;
   }
   //
   strComArray[i]=cCheckName;
   i++;
  }
  //
  RegCloseKey(hHardwareKey);
}
return i;
}