[SOLVED] Can't open file from dynamic filepath

Using Arduino Storage
4

Thanks for your help, huge mistake with the returned value from strcmp !

Here is the full code :

#include <SdFat.h>

SdFat sd;
SdFile prev, file;

char nextApp[30] = {0};
void setup() {
  // put your setup code here, to run once:
  sd.begin(SD_CS_PIN, SPI_FULL_SPEED);

  while (!SerialUSB);

  if (prev.open("/System/Loader/NEXTAPP.TXT", O_READ))
  {
    char c = 0;
    int i = 0;
    String s = "";
    digitalWrite(13, HIGH);
    memset(nextApp, 0, 30);

    while (c != '\n')
    {
      c = prev.read();
      if (c != '\n')
      {
        s += char(c);
        nextApp[i] = c;
        i++;
      }
    }
    prev.close();


    SerialUSB.println(strcmp(s.c_str(), "/Test/Test.bin") ? "\"/Test/Test.bin\" differs from \"" + String(s.c_str()) + "\"" : "Match");
    SerialUSB.println(strcmp(nextApp, "/Test/Test.bin") ? "Differ" : "Match");

    SerialUSB.print("i = ");
    SerialUSB.println(i);
    SerialUSB.print("s.length() = ");
    SerialUSB.println(s.length());

    if (file.open(nextApp, O_READ))
    {
      SerialUSB.println("File open success using char *");
    }
    else if (file.open(s.c_str(), O_READ))
    {
      SerialUSB.println("File open success using c_str()");
    }
  }
}

void loop() {
  // put your main code here, to run repeatedly:

}

Which displays this on the Serial port :

"/Test/Test.bin" differs from "/Test/Test.bin"
Differ
i = 19
s.length() = 19