[Need Help] Printing text to Micro SD Card

[MatthewShute]

Hello, I was wondering if anyone knew how to print text to a Micro SD Cards text file inside of VEXcode Pro V5. I have looked all over, but I cannot get one solid answer, so if somebody will help me that would be so greatly appreciated. Also if there was a way to print to the brain and grab an output file that would be great aswell.

[DrewWHOOP]

iirc, you can do it using something like:

//Open file
FILE* mytextfile = fopen("filename.txt", "a");

//Print to file
fprintf(mytextfile, "Format string", ...);

//Close file
fclose(mytextfile);

if you are using a loop, you would want to open the file before the loop and close it after.

[weilin]

This post has some more examples:

SD Card Help

Here’s a simple example showing how to use the VCS SD card save and load file API. This saves some information into a file called “test.h” on the SD card and then reads it back again. #include "robot-config.h" // storage for some information to save uint8_t myTestData[ 100 ]; uint8_t myReadBuffer[ 1000 ]; int main() { // set the test data to something detectable for(int i=0;i<100;i++) { myTestData* = i * 2; } // write test data to SD Card int nWritten…

[MatthewShute]

Thanks for the reply. I put the open file code inside of the top of usercontrol(), then I put the rest inside a button. Can I do this? The error I get is a memory permission error (0304CA62).

[DrewWHOOP]

It appears that VexCode’s API actually has its own file management system. You should use what weilin linked instead.

[MatthewShute]

Gotcha, I will try it as soon as possible. That code seems to be in vex coding studio instead of vex v5 pro, you think it will still work?

[DrewWHOOP]

VexCode is based on the VCS API.

[jpearman]

VEXcode supports both the slightly simplified API using the Brain.SDcard methods or standard C and C++ APIs using file descriptors and streams.

[MatthewShute]

Thank you all for your help!