hello all, i want to ask about the vinculum. what i want to do is to read some file in the usb pendrive. but what i want to do is, i want it to saperate into some folder. i manage to read/write file without the folder buat when the file is in the folder and i want to write the file into the folder, it cannot be done. i had alreadygo though the other forum, example, etc, but still cannot solve for this vinculum. can anyone help me? A.S.A.P please
Welcome to the forum, Mohd Zhafri!
We would have to see your code that you tried, before we could comment on how to proceed.
I see no reason why this can't be done, but all the details have to be known, before we can be sure.
Be sure to use [code] tags on both ends of your code. Otherwise the forum software turns it into HTML mush.
Reading and writing files on a pen drive is the same as reading and writing any other file...
as i had said before, i already can read and write the file into pendrive. i'm using fopen, fread,fwrite.
but when it comes to read and write file in the folder, it cannot be done on the vinculum.
[fileRead = fopen("read.TXT", "a+");]
[file = fopen("TEST.TXT", "a+");]
is it cannot directly put the "\" to epen the containing file in the folder?
Maybe this thread helps? You seem to be having the same problem.
Yes, you need to double up on the backslashes in your string literal, to make it acceptable to C, since '\' is the escape char.
i had tried all the suggestion that you all ad suggest, but the output is bad.. =(
as you said before, use the double backslash also cannot solve the problem. some new file appear on my pendrive name exactly like the path that i want to open. what i'm already tried is the:
1) [fileRead = fopen("F:\\02\\read.txt", "r");]
[file = fopen("F:\\02\\TEST.txt","w");]
2) [fileRead = fopen("02\\read.txt", "r");]
[file = fopen("02\\TEST.txt","w");]
3) [fileRead = fopen("read.txt", "r");]
[file = fopen("TEST.txt","w");]
only the number 3 get the correct output and can write some text into the TEST.txt file.
is it cannot be done on the vinculum II SOC?
You have the pen drive as the F drive?
Why are you using square brackets around your fopen line of code? (for the forum, use code tags, [the # icon in the advanced editor] and put your code right between the code tags it gives you.
Check that you can create a new file on your pen drive, using notepad, or some other program.
As a last resort, replace the backslashes, with just one forward slash char: "\\" gets changed to "/".
If you can access it as F:\ from everywhere else, you should be able to do it that same way using fopen().
Isn't that what you want?some new file appear on my pendrive name exactly like the path that i want to open.
I would only blame it on fopen() if it returns NULL in both cases (and read.txt exists).
Tell me... does a folder F:\02 exist on that pendrive?Originally Posted by Mohd Zhafri
If it does not you need to create it before you can open a file in it.
Is your drive letter correct?
yes...that folder exist. but still cannot read and write on that folder.
sorry Adak if i'm misunderstood what you told before about the "[ ]". =)
may i know what do you mean by
As a last resort, replace the backslashes, with just one forward slash char: "\\" gets changed to "/".
Is this by chance a Windows 7 system?
If it is you may need to take ownership of the pendrive before you can write to it...
Computer -> right click the drive -> Properties -> security tab -> advanced button -> owner tab -> Edit -> select your name -> click "Replace owner on all files and folders"... click OK.
Try again.
It it's not Windows 7 ... never mind.
yes...i'm using windows 7
i cannot find the security tab. only have general tab,tools tab,hardware tab,sharing tab,ready boost tab and customize tabComputer -> right click the drive -> Properties -> security tab -> advanced button -> owner tab -> Edit -> select your name -> click "Replace owner on all files and folders"... click OK.
Ok... so it's formatted with FAT32 ... no worries.
Now we know your problem is elsewhere...
Post your complete code as it is now, lets see what we're up against.
what do you mean by formatted with FAT32?
this is my function that contain the code
Code:void firmware() { FILE *file; FILE *fileRead; long lSize; char * buffer; char buf[100]; size_t result; gpio_ioctl_cb_t gpio_iocb; unsigned char leds; open_drivers(); gpio_iocb.ioctl_code = VOS_IOCTL_GPIO_SET_MASK; gpio_iocb.value = 0xff; vos_dev_ioctl(hGPIO_PORT_A, &gpio_iocb); do { if (usbhost_connect_state(hUSBHOST_2) == PORT_STATE_ENUMERATED) { hBOMS = boms_attach(hUSBHOST_2, VOS_DEV_BOMS); if (hBOMS == NULL) { leds = led3; vos_dev_write(hGPIO_PORT_A, &leds, 1, NULL); vos_delay_msecs(1000); break; } hFAT_FILE_SYSTEM = fat_attach(hBOMS, VOS_DEV_FAT_FILE_SYSTEM); if (hFAT_FILE_SYSTEM == NULL) { leds = led3; vos_dev_write(hGPIO_PORT_A, &leds, 1, NULL); vos_delay_msecs(1000); break; } fsAttach(hFAT_FILE_SYSTEM); fileRead = fopen("F:\\02\\read.txt", "r"); file = fopen("F:\\02\\write.txt","w"); if (file == NULL) { leds = led3; vos_dev_write(hGPIO_PORT_A, &leds, 1, NULL); vos_delay_msecs(1000); break; } fseek (fileRead , 0 , SEEK_END); lSize = ftell (fileRead); rewind (fileRead); buffer = (char*) malloc (sizeof(char)*lSize); result = fread (buffer,1,50,fileRead); if (fwrite((buffer), strlen(buffer), sizeof(char), file) == -1) { leds = led3; vos_dev_write(hGPIO_PORT_A, &leds, 1, NULL); vos_delay_msecs(1000); } if (fclose(file) == -1) { leds = led3; vos_dev_write(hGPIO_PORT_A, &leds, 1, NULL); vos_delay_msecs(1000); } if (fclose(fileRead) == -1) { leds = led3; vos_dev_write(hGPIO_PORT_A, &leds, 1, NULL); vos_delay_msecs(1000); } leds = led1; vos_dev_write(hGPIO_PORT_A, &leds, 1, NULL); fat_detach(hFAT_FILE_SYSTEM); boms_detach(hBOMS); leds = 0; vos_dev_write(hGPIO_PORT_A, &leds, 1, NULL); vos_delay_msecs(5000); } } while (1); }
