Many tabs using one file

[chauteen]

It's me again. I'm still fighting with tabs. I have 7 tabs with spins on them, and one Dialog. I use Propertypage, and use the instruction "AddPage" to make the 7 tabs on the dialog. Now I want to store the spin value in a flie when the user click and change the spin value. (or maybe in 7 different file, for one tab own one file belong to itself) Then, I have to communicate with a controller throu RS-232 under modbus portocol. Because I'm slave on modbus, I only can send data out when the controller send out query message. So I planning to store the spin value in files, then waiting untill the query message, then I send the data I stored in the file. I would like to ask how to deal with the file pointer. I use the code: in my base dialog' cpp: FILE *filedlg; filelog = fopen( "file_page1.txt", "r+" ) What code about pointer assignment I suppose to write in tab page1' cpp or h file to complete the rest? I mean page1 doesn't know the exitance of file pointer filedlg. I'm new about pointer and MFC, and would be many appriciate about your help. chauteen