sending command to IC magnetic card reader through serial port e.g command 0x03

[Lesiok]

What You want to send : one byte with value 0x32 or four characters 0,x,3,2 ?

[hezbon]

What You want to send : one byte with value 0x32 or four characters 0,x,3,2 ?

one byte with value 0x32

[Lesiok]

So just use method putChar(char c). QExtSerialPort is a descendant of QIODevice class.

[hezbon]

So just use method putChar(char c). QExtSerialPort is a descendant of QIODevice class.

iget the following error in this code part

char vf="0x00";
        putchar(vf);
        QByteArray commands;
        ports->write(putchar(0x00));

char vf="0x00";
        putchar(vf);
        QByteArray commands;
        ports->write(putchar(0x00));

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D:\Qt\embedded-build-desktop-Qt_4_7_4_for_Desktop_-_MinGW_4_4__Qt_SDK__Debug\..\embedded\mainwindow.c pp:120: error: invalid conversion from 'const char*' to 'char'

D:\Qt\embedded-build-desktop-Qt_4_7_4_for_Desktop_-_MinGW_4_4__Qt_SDK__Debug\..\embedded\mainwindow.c pp:123: error: invalid conversion from 'int' to 'const char*'
D:\Qt\embedded-build-desktop-Qt_4_7_4_for_Desktop_-_MinGW_4_4__Qt_SDK__Debug\..\embedded\mainwindow.c pp:123: error: initializing argument 1 of 'QByteArray::QByteArray(const char*)'

---

Added after 15 minutes:

iget the following error in this code part

char vf="0x00";
        putchar(vf);
        QByteArray commands;
        ports->write(putchar(0x00));

char vf="0x00";
        putchar(vf);
        QByteArray commands;
        ports->write(putchar(0x00));

To copy to clipboard, switch view to plain text mode 

D:\Qt\embedded-build-desktop-Qt_4_7_4_for_Desktop_-_MinGW_4_4__Qt_SDK__Debug\..\embedded\mainwindow.c pp:120: error: invalid conversion from 'const char*' to 'char'

D:\Qt\embedded-build-desktop-Qt_4_7_4_for_Desktop_-_MinGW_4_4__Qt_SDK__Debug\..\embedded\mainwindow.c pp:123: error: invalid conversion from 'int' to 'const char*'
D:\Qt\embedded-build-desktop-Qt_4_7_4_for_Desktop_-_MinGW_4_4__Qt_SDK__Debug\..\embedded\mainwindow.c pp:123: error: initializing argument 1 of 'QByteArray::QByteArray(const char*)'

please dont look at the error i have done this and no error has been realized sorry i gotten rid of the errors here is my new code.

ports->putChar(0x00);

ports->putChar(0x00);

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now my problem is the lcd display is 8x6 matrix and is connected via serial and by default it displays a,b,c,d,..i and now i want to display my data using my laptop from my programm and am using serial to usb converter, when i send the above, i should see something because there is that command for the gadget, i want to do a heads up display of the number of people in a department, but after sending the command nothing clearly happens.

---

Added after 21 minutes:

please dont look at the error i have done this and no error has been realized sorry i gotten rid of the errors here is my new code.

ports->putChar(0x00);

ports->putChar(0x00);

To copy to clipboard, switch view to plain text mode 

now my problem is the lcd display is 8x6 matrix and is connected via serial and by default it displays a,b,c,d,..i and now i want to display my data using my laptop from my programm and am using serial to usb converter, when i send the above, i should see something because there is that command for the gadget, i want to do a heads up display of the number of people in a department, but after sending the command nothing clearly happens.

[Lesiok]

I think you have some documentation for this display. Read it.

[hezbon]

I think you have some documentation for this display. Read it.

funnily enough the supplier never gave the documentation of the device. i have looked at it and i got a chinese which i translated to english but images could not be displayed, i dont know whether it is within my code or the serial lcd but if anyone can know a better lcd to display plz tell so that i buy it.

[wysota]

I don't quite understand why you're asking on a forum dedicated to Qt how to use some 3rd party hardware device...