sending file with FTP over WiFi

I am using SurferTim's FTP code here, which I have modified to work with WiFi. I can verify the code and upload it to the ESP8266, but when I try to run it, the board starts repeatedly resetting. I have had this problem every time I try to use the WiFi library with the ESP8266. However, when I change to using the ESP8266WiFi library (which works in other sketches, and can connect to the wifi properly), I get the following error. I am also including my modified version of the code below for reference. (Anywhere with three dashes --- is where I have removed info I don't want shared.) I'm still pretty new to this, so I may be missing something that should be obvious. Can anyone assist?

In file included from C:\Users\crlas_000\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\libraries\ESP8266WiFi\src/ESP8266WiFi.h:39:0,

from C:\Users\crlas_000\Documents\Arduino\FTP\FTP.ino:10:

C:\Users\crlas_000\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\libraries\ESP8266WiFi\src/WiFiClient.h: In instantiation of 'size_t WiFiClient::write(T&, size_t) [with T = unsigned char [64]; size_t = unsigned int]':

C:\Users\crlas_000\Documents\Arduino\FTP\FTP.ino:186:33: required from here

C:\Users\crlas_000\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\libraries\ESP8266WiFi\src/WiFiClient.h:123:36: error: request for member 'available' in 'source', which is of non-class type 'unsigned char [64]'

size_t left = source.available();

^

C:\Users\crlas_000\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\libraries\ESP8266WiFi\src/WiFiClient.h:127:5: error: request for member 'read' in 'source', which is of non-class type 'unsigned char [64]'

source.read(buffer.get(), will_send);

^

Using library SD at version 1.0.5 in folder: C:\Users\crlas_000\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\libraries\SD
Using library SPI at version 1.0 in folder: C:\Users\crlas_000\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\libraries\SPI
Using library ESP8266WiFi at version 1.0 in folder: C:\Users\crlas_000\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\libraries\ESP8266WiFi
exit status 1
Error compiling for board Adafruit HUZZAH ESP8266.

#include <SD.h>
#include <SPI.h>
#include <ESP8266WiFi.h>
// comment out next line to write to SD from FTP server
#define FTPWRITE

// this must be unique
byte mac[] = { 0x18, 0xFE, 0x34, 0xDB, 0x52, 0x71 };  

// change to your network settings
char* ssid = "---";
char* pass = "---";

// change to your server
IPAddress server( --- );

WiFiClient client;
WiFiClient dclient;

char outBuf[128];
char outCount;

// change fileName to your file (8.3 format!)
char fileName[13] = "current.txt";

void setup()
{
  Serial.begin(115200);

  digitalWrite(10,HIGH);

  if(SD.begin(16) == 0)
  {
    Serial.println(F("SD init fail"));          
  }

  WiFi.begin(ssid, pass);
  digitalWrite(10,HIGH);
  delay(2000);
  Serial.println(F("Ready. Press f or r"));
}

void loop()
{
  byte inChar;

  inChar = Serial.read();

  if(inChar == 'f')
  {
    if(doFTP()) Serial.println(F("FTP OK"));
    else Serial.println(F("FTP FAIL"));
  }

  if(inChar == 'r')
  {
    readSD();    
  }

}

File fh;

byte doFTP()
{
#ifdef FTPWRITE
  fh = SD.open(fileName,FILE_READ);
#else
  SD.remove(fileName);
  fh = SD.open(fileName,FILE_WRITE);
#endif

  if(!fh)
  {
    Serial.println(F("SD open fail"));
    return 0;    
  }

#ifndef FTPWRITE  
  if(!fh.seek(0))
  {
    Serial.println(F("Rewind fail"));
    fh.close();
    return 0;    
  }
#endif

  Serial.println(F("SD opened"));

  if (client.connect(server,21)) {
    Serial.println(F("Command connected"));
  }
  else {
    fh.close();
    Serial.println(F("Command connection failed"));
    return 0;
  }

  if(!eRcv()) return 0;

  client.println(F("USER ---"));

  if(!eRcv()) return 0;

  client.println(F("PASS ---"));

  if(!eRcv()) return 0;

  client.println(F("SYST"));

  if(!eRcv()) return 0;

  client.println(F("Type I"));

  if(!eRcv()) return 0;

  client.println(F("PASV"));

  if(!eRcv()) return 0;

  char *tStr = strtok(outBuf,"(,");
  int array_pasv[6];
  for ( int i = 0; i < 6; i++) {
    tStr = strtok(NULL,"(,");
    array_pasv[i] = atoi(tStr);
    if(tStr == NULL)
    {
      Serial.println(F("Bad PASV Answer"));    

    }
  }

  unsigned int hiPort,loPort;

  hiPort = array_pasv[4] << 8;
  loPort = array_pasv[5] & 255;

  Serial.print(F("Data port: "));
  hiPort = hiPort | loPort;
  Serial.println(hiPort);

  if (dclient.connect(server,hiPort)) {
    Serial.println(F("Data connected"));
  }
  else {
    Serial.println(F("Data connection failed"));
    client.stop();
    fh.close();
    return 0;
  }

#ifdef FTPWRITE
  client.print(F("STOR "));
  client.println(fileName);
#else
  client.print(F("RETR "));
  client.println(fileName);
#endif

  if(!eRcv())
  {
    dclient.stop();
    return 0;
  }

#ifdef FTPWRITE
  Serial.println(F("Writing"));

  byte clientBuf[64];
  int clientCount = 0;

  while(fh.available())
  {
    clientBuf[clientCount] = fh.read();
    clientCount++;

    if(clientCount > 63)
    {
      dclient.write(clientBuf,64);
      clientCount = 0;
    }
  }

  if(clientCount > 0) dclient.write(clientBuf,clientCount);

#else
  while(dclient.connected())
  {
    while(dclient.available())
    {
      char c = dclient.read();
      fh.write(c);      
      Serial.write(c);
    }
  }
#endif

  dclient.stop();
  Serial.println(F("Data disconnected"));

  if(!eRcv()) return 0;

  client.println(F("QUIT"));

  if(!eRcv()) return 0;

  client.stop();
  Serial.println(F("Command disconnected"));

  fh.close();
  Serial.println(F("SD closed"));
  return 1;
}

byte eRcv()
{
  byte respCode;
  byte thisByte;

  while(!client.available()) delay(1);

  respCode = client.peek();

  outCount = 0;

  while(client.available())
  {  
    thisByte = client.read();    
    Serial.write(thisByte);

    if(outCount < 127)
    {
      outBuf[outCount] = thisByte;
      outCount++;      
      outBuf[outCount] = 0;
    }
  }

  if(respCode >= '4')
  {
    efail();
    return 0;  
  }

  return 1;
}


void efail()
{
  byte thisByte = 0;

  client.println(F("QUIT"));

  while(!client.available()) delay(1);

  while(client.available())
  {  
    thisByte = client.read();    
    Serial.write(thisByte);
  }

  client.stop();
  Serial.println(F("Command disconnected"));
  fh.close();
  Serial.println(F("SD closed"));
}

void readSD()
{
  fh = SD.open(fileName,FILE_READ);

  if(!fh)
  {
    Serial.println(F("SD open fail"));
    return;    
  }

  while(fh.available())
  {
    Serial.write(fh.read());
  }

  fh.close();
}