原创 基于MSCOMM控件串口通讯(MFC)

个人收集和理解所书，转载注明出处

虽然网上很多关于这个的资料了，但还是自己总结下

获取当前可用的串口

可以通过读取注册表获取相应的值。当前可用的COM口在注册表中的位置：

HKEY_LOCAL_MACHINE\\HARDWARE\\DEVICEMAP\\SERIALCOMM

通过枚举来获取所有的COM口。实现如下：

调用举例：

enum_reg_key_value(HKEY_LOCAL_MACHINE, ”HARDWARE\\DEVICEMAP\\SERIALCOMM”);

bool CValueDlg::enum_reg_key_value(HKEY hKey, LPCTSTR lpSubKey)

{

#define MAX_VALUE_NAME 100

    HKEY    hOpenKey;

    long    lResult = 0;

    CHAR    achClass[MAX_PATH];

    DWORD   cchClassNameLen;

    DWORD   cMaxClassLen;

    DWORD   cSubKeysNum;

    DWORD   cbMaxSubKeyLen;

    DWORD   cbValuesNum;

    DWORD   cbMaxValueNameLen;

    DWORD   cbMaxValueLen;

    DWORD   cbSecurityDescriptor;

    FILETIME ftLastWriteTime;

    CHAR  achValue[MAX_VALUE_NAME];

    DWORD cbValue = MAX_VALUE_NAME;

    DWORD DataType;

    BYTE  Data[255];

    DWORD DataLen;

    CString StrData = L"";

    lResult = RegOpenKeyEx(hKey, lpSubKey, 0, KEY_READ, &hOpenKey);

    if(ERROR_SUCCESS != lResult)

    {

        return FALSE;

    }

    RegQueryInfoKey(hOpenKey, //已打开的键的句柄

                                       achClass, //类型名称

                                       &cchClassNameLen, //类型名称的长度

                                      NULL, //保留

                                    &cSubKeysNum, // 返回子键的数目

                                    &cbMaxSubKeyLen, // 返回最长的子键长度

                                   &cMaxClassLen, // 返回最长的类长度

                                  &cbValuesNum, // 返回值的数目

                                 &cbMaxValueNameLen, // 返回最长的值项,名称的长度

                                 &cbMaxValueLen, // 返回最长的值的长度

                                &cbSecurityDescriptor, //返回安全描述

                               &ftLastWriteTime); // 返回键最后被写入的时间

    for (DWORD j = 0, retValue = ERROR_SUCCESS; j < cbValuesNum; j++)

   {

        cbValue = MAX_VALUE_NAME;

        memset(achValue, 0, sizeof(achValue));

        memset(Data, 0, sizeof(Data));

        StrData = L"";

        retValue = RegEnumValue(hOpenKey,

                                                           j,

                                                          achValue,

                                                          &cbValue,

                                                          NULL,

                                                          &DataType,

                                                         Data,

                                                        &DataLen);

         if (retValue == (DWORD) ERROR_SUCCESS )

         { 

             StrData.Format("%s", Data);

             m_ComboComSelect.AddString(StrData);  

         }

    }

    RegCloseKey(hOpenKey);

    return true;

#undef MAX_VALUE_NAME

}

打开串口

m_CMSComm.SetCommPort(4);

m_CMSComm. SetInBufferSize(1024);

m_CMSComm. SetOutBufferSize(512);

if(!m_CMSComm.GetPortOpen())

{

       try

       {

              m_CMSComm.SetPortOpen(TRUE); //打开串口

       }

       catch(COleDispatchException *e)//如果所要打开的串口已经被其他程序使用，会报异常

       {    

              AfxMessageBox("Error:The COM has been occupied or isn't Exist");

              e = NULL;

              return;

       }

       m_CMSComm.SetInputMode(0); //设置输入方式为Text

       m_CMSComm.SetSettings(m_Uart_Struct.settings);

       m_CMSComm.SetRThreshold(1); //为1表示接收到一个字符便出发接收事件

       m_CMSComm.SetInputLen(0);// 设置当前接收区数据长度为0,表示全部读取

}

else

{

              AfxMessageBox("Error:The COM has been occupied or isn't Exist");

}

串口数据发送

关于串口数据的发送网上很多的写法都是利用以下的方法

CByteArray array;

DWORD len = 0;

char TxData [1024 + 1];

CString StrData = L"";

len = StrData.GetLength();

memset(TxData, 0, sizeof(TxData));

strcpy(TxData, StrData);

array.RemoveAll();

array.SetSize(len);

for(DWORD i=0; i<len; i++)

{

       array.SetAt(i, TxData);