Since you have the values in the loop() function, I would put the SD routine immediately after the getPage() call. Like this:
if(!logFile(temp0,temp1)) Serial.println("Log failed");
else Serial.println("Log ok");
Here is logFile:
int logFile(int temp0, int temp1) {
File fh = SD.open("test.txt",FILE_WRITE);
if(!fh) {
Serial.println("Open fail");
return 0;
}
// Use the same character array here to send stuff to the file.
// pageAdd array is global
sprintf(pageAdd,"Field1=%u Field2=%u",temp0,temp1);
fh.println(pageAdd);
fh.close();
return 1;
}