Serial Port (RS -232) Connection in C++

Question

I have done serial port RS-232 connection in C++ using 16-bit compiler (I was using Turbo C++ IDE). It included header file bios.h which contain all the required functions for reading values from the port. Now I want to read value from serial port using C++ 32-bit Mingw compiler. I am using Dev CPP as my IDE. Here I could not find bios.h. Are there any special header files available for this purpose in Mingw? I am using 32-bit compiler now because in my college project I got to use Exception handling which I guess is not supported in Turbo C. Please help me out.

Answer 1

Please take a look here:

• RS-232 for Linux and Windows ¹⁾
• Windows Serial Port Programming ²⁾
• Using the Serial Ports in Visual C++ ³⁾
• Serial Communication in Windows

¹⁾You can use this with Windows (incl. MinGW) as well as Linux. Alternative you can only use the code as an example.

²⁾Step-by-step tutorial how to use serial ports on windows

³⁾You can use this literally on MinGW

Here's some very, very simple code (without any error handling or settings):

#include <windows.h>  /* ... */   // Open serial port HANDLE serialHandle;  serialHandle = CreateFile("\\\\.\\COM1", GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);  // Do some basic settings DCB serialParams = { 0 }; serialParams.DCBlength = sizeof(serialParams);  GetCommState(serialHandle, &serialParams); serialParams.BaudRate = baudrate; serialParams.ByteSize = byteSize; serialParams.StopBits = stopBits; serialParams.Parity = parity; SetCommState(serialHandle, &serialParams);  // Set timeouts COMMTIMEOUTS timeout = { 0 }; timeout.ReadIntervalTimeout = 50; timeout.ReadTotalTimeoutConstant = 50; timeout.ReadTotalTimeoutMultiplier = 50; timeout.WriteTotalTimeoutConstant = 50; timeout.WriteTotalTimeoutMultiplier = 10;  SetCommTimeouts(serialHandle, &timeout); 

Now you can use WriteFile() / ReadFile() to write / read bytes. Don't forget to close your connection:

CloseHandle(serialHandle);