bluetooth communications (RS-232)

[freekill]

I have a working code in dev-c++ where I'm transmitting from a host PC to a mobile robot using bluetooth. However, I'm getting errors when I try to integrate the working program into my Qt GUI. I'm getting this particular error:

In member function 'void Bluetooth::initialize()': error: cannot convert 'const char*' to 'const WCHAR*' for argument '1' to 'void* CreateFileW(const WCHAR*, DWORD, DWORD, _SECURITY_ATTRIBUTES*, DWORD, DWORD, void*)'

Here's my code:
bluetooth.h


#ifndef BLUETOOTH_H
#define BLUETOOTH_H

#include <windows.h>

class Bluetooth {
public:
Bluetooth();
~Bluetooth();

void initialize();
void transmit(int right, int left);

private:
DWORD bytes_written;
BOOL Status;
HANDLE SerialHandle;
DCB SerialConfigs;
};

#endif


bluetooth.cpp


#include <QDebug>
#include "bluetooth.h"
#include "settings.h"

Bluetooth::Bluetooth() {}

Bluetooth::~Bluetooth() {}

void Bluetooth::initialize() {
qDebug()<<"Initializing BlueTooth...";
Status = 0;
SerialHandle = CreateFile("COM5",
GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL);

if(SerialHandle==INVALID_HANDLE_VALUE) {
if(GetLastError()==ERROR_FILE_NOT_FOUND) {
qDebug()<<"E: Serial Port Does Not Exist!";
}
qDebug()<<"An Error Occured!";
}
ZeroMemory(&SerialConfigs, sizeof(SerialConfigs));
SerialConfigs.DCBlength = sizeof(SerialConfigs);
if (!GetCommState(SerialHandle, &SerialConfigs)) {
qDebug()<< "Error Getting State!";
}
SerialConfigs.BaudRate = CBR_9600;
SerialConfigs.ByteSize = 8;
SerialConfigs.StopBits = ONESTOPBIT;
SerialConfigs.Parity = NOPARITY;

if(!SetCommState(SerialHandle, &SerialConfigs)) {
qDebug()<<"Error Setting Serial Port State!";
}
qDebug()<<"Initialization Done";
}

void Bluetooth::transmit(int right, int left) {
WriteFile(SerialHandle,
&right, // Outgoing data
1, // Number of bytes to write
&bytes_written, // Number of bytes written
NULL);
Status = WriteFile(SerialHandle,
&left,
1,
&bytes_written,
NULL);
if (Status == 0) {
qDebug()<<"Error Writing";
}
}

[kuzulis]

In member function 'void Bluetooth::initialize()': error: cannot convert 'const char*' to 'const WCHAR*' for argument '1' to 'void* CreateFileW(const WCHAR*, DWORD, DWORD, _SECURITY_ATTRIBUTES*, DWORD, DWORD, void*)'

:) use CreateFileA

or ready-made libraries:
QSerialDevice -> http://fireforge.net/snapshots.php?group_id=199
or
QExtSerialPort -> http://code.google.com/p/qextserialport/

[kuzulis]

In member function 'void Bluetooth::initialize()': error: cannot convert 'const char*' to 'const WCHAR*' for argument '1' to 'void* CreateFileW(const WCHAR*, DWORD, DWORD, _SECURITY_ATTRIBUTES*, DWORD, DWORD, void*)'

:) use CreateFileA

or ready-made libraries:
QSerialDevice -> http://fireforge.net/snapshots.php?group_id=199
or
QExtSerialPort -> http://code.google.com/p/qextserialport/

[freekill]

:) use CreateFileA
I didn't really specify CreateFileW my code just reads CreateFile.

[high_flyer]

It looks like you have an issue with unicode.
See if somewhere _UNICODE is defined in your project settings.
here is some info on the subject:
http://msdn.microsoft.com/en-us/library/7dzey6h6%28VS.71%29.aspx

Derived from this link you might try using one of the macros specified for example:



SerialHandle = CreateFile(_T("COM5"),
GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL);

[freekill]

It looks like you have an issue with unicode.
See if somewhere _UNICODE is defined in your project settings.
here is some info on the subject:
http://msdn.microsoft.com/en-us/library/7dzey6h6%28VS.71%29.aspx

Derived from this link you might try using one of the macros specified for example:



SerialHandle = CreateFile(_T("COM5"),
GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL);



The _T() flags an error: undeclared (first use of this function).:(

[kuzulis]

I didn't really specify CreateFileW my code just reads CreateFile.


if you look at include the compiler (such as MinGW) you will see the following:


...
WINBASEAPI HANDLE WINAPI CreateFileA (LPCSTR, DWORD, DWORD, LPSECURITY_ATTRIBUTES, DWORD, DWORD, HANDLE);
WINBASEAPI HANDLE WINAPI CreateFileW (LPCWSTR, DWORD, DWORD, LPSECURITY_ATTRIBUTES, DWORD, DWORD, HANDLE);
...
# define CreateFile CreateFileW
...


As you can see under CreateFile default means CreateFileW!!!

One solution to your problem is to use CreateFileA. This is the easiest, or use macros TEXT()

[freekill]

CreateFileA worked..all the thanks ;)