Cannot read data from GUI through UART

[doremifaso]

Hi!

Below are my C codes using NIOS 2 IDE to send and read data using DE2 board through UART by RS232 port.

Also, I build my own GUI to receive and send data to UART. After I read the data from my GUI and store the data in array prompt [10], I decide to display the array prompt [10] to my GUI by using several type of function calling, as shown coding below in bold style. However, from my GUI I cannot read the data sending. may i know how to solve it? Thanks!

int main ()
{
FILE* fp1;
char prompt[10] ;

fp1 = fopen(UART_0_NAME , "r+");

if (fp1)
{
while (1)
{
//I get the data from my GUI
fgets(prompt, 8, fp1);

// I send data to be displayed in my GUI
fwrite (prompt , 1 , sizeof(prompt) , fp1 );
cout<< prompt;
fputs (prompt,fp1);
}
fclose (fp1);
}
return 0;
}