Method for C++ to get system activity, available serial port and name
This article mainly explains "C++ how to get system activities, available serial ports and names". Interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Next, let the editor take you to learn how C++ can get system activities, available serial ports and names.
CreateFile method:
Void GetComList_256 (CComboBox * CCombox) / / get the available com ports to support up to 256
{
CString strCom,strComOpen
Int nCom = 0
Int count = 0
HANDLE hCom
CCombox- > ResetContent ()
Do
{
NCom++
StrCom.Format ("COM%d", nCom)
StrComOpen.Format ("\\.\\ COM%d", nCom)
HCom = CreateFile (strComOpen, GENERIC_READ | GENERIC_WRITE, 0, NULL
OPEN_EXISTING, FILE_FLAG_OVERLAPPED, 0)
If (INVALID_HANDLE_VALUE = = hCom)
{
DWORD error=::GetLastError (); / / get the error message
}
Else
{
CCombox- > AddString (strCom)
Count++
}
CloseHandle (hCom)
} while (nComSetCurSel (0)
}
*
How to read the registry:
Int GetComList_Reg (CComboBox * CCombox)
{
HKEY hkey
Int result
Int I = 0
CString strComName;// serial port name
Detailed name of CString strDrName;// serial port
Result = RegOpenKeyEx (HKEY_LOCAL_MACHINE
_ T ("Hardware\\ DeviceMap\\ SerialComm")
NULL
KEY_READ
& hkey)
If (ERROR_SUCCESS = = result) / / Open the serial port registry
{
TCHAR portName [0x100], commName [0x100]
DWORD dwLong, dwSize
CCombox- > ResetContent ()
Do
{
DwSize = sizeof (portName) / sizeof (TCHAR)
DwLong = dwSize
Result = RegEnumValue (hkey, I, portName, & dwLong, NULL, NULL, (LPBYTE) commName, & dwSize)
If (ERROR_NO_MORE_ITEMS = = result)
{
/ / enumerate serial ports
Break; / / commName is the serial port name "COM2"
}
StrComName=commName
StrDrName = portName
/ / find the first'\ 'from right to left and get the length of the string on the left
Int len = strDrName.ReverseFind ('\')
/ / get the string to the left of'\'
CString strFilePath = strDrName.Left (len+1)
/ / get the string to the right of'\'
CString fileName = strDrName.Right (strDrName.GetLength ()-len-1)
FileName = strComName + _ T (":") + fileName
CCombox- > AddString (fileName)
ITunes +
} while (1)
RegCloseKey (hkey)
}
CCombox- > SetCurSel (0)
Return i
}
After reading, it can also be added to the combo box, and can be added to the data as needed.
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