AI Thinker ESP32-CAM卡编译错误

Compile error for AI Thinker ESP32-CAM card

您好,我是微处理器C语言初学者。我想使用 copyimage() 函数复制一个 .bmp 文件。按下编译按钮时会出现此错误:

#include "esp_camera.h"
#include "Arduino.h"
#include "FS.h"                // SD Card ESP32
#include "SD_MMC.h"            // SD Card ESP32
#include "soc/soc.h"           // Disable brownour problems
#include "soc/rtc_cntl_reg.h"  // Disable brownour problems
#include "driver/rtc_io.h"
#include <EEPROM.h>            // read and write from flash memory
#include <SPI.h>
#include <stdio.h>
#include <iostream>
#include <fstream>

// define the number of bytes you want to access
#define EEPROM_SIZE 1
// Pin definition for CAMERA_MODEL_AI_THINKER
#define PWDN_GPIO_NUM     32
#define RESET_GPIO_NUM    -1
#define XCLK_GPIO_NUM      0
#define SIOD_GPIO_NUM     26
#define SIOC_GPIO_NUM     27

#define Y9_GPIO_NUM       35
#define Y8_GPIO_NUM       34
#define Y7_GPIO_NUM       39
#define Y6_GPIO_NUM       36
#define Y5_GPIO_NUM       21
#define Y4_GPIO_NUM       19
#define Y3_GPIO_NUM       18
#define Y2_GPIO_NUM        5
#define VSYNC_GPIO_NUM    25
#define HREF_GPIO_NUM     23
#define PCLK_GPIO_NUM     22

int pictureNumber = 0;
int CopyNumber = 0;

void imgWriter(const char *imgName,
               unsigned char *buf,
               int len,
               int width,
               int height)// WRITE A FILE
               {
                  fs::FS &fs = SD_MMC;
                  Serial.printf("Picture file name: %s\n",imgName);
                  Serial.printf("%d\n",len);
                  Serial.printf("%d\n",width);
                  Serial.printf("%d\n",height);
                  File fo =fs.open(imgName,FILE_WRITE);
                  if(!fo){
                    Serial.println("Failed to open file in writing mode");
                  }
                  else {
                    fo.write(buf,len);    // payload (image), payload length
                    Serial.printf("Saved file to path: %s\n" , imgName);
                    EEPROM.write(0, pictureNumber);
                    EEPROM.commit();
                  }
                  fo.close();
                  }
void copyImage(const char *imgName,
               int width,
               int height,
               const char *copyimage)     // COPY A FILE
              {
                 fs::FS &fs = SD_MMC;     // Allows access to SD card
                 File fo =fs.open(imgName,FILE_READ);
                 File fy =fs.open(copyimage,FILE_WRITE);
                 if(!fo){
                    Serial.printf("Unable to open file for reading");
                 }
                 unsigned char header[54];
                 unsigned char colorTable[1024];
                 
                 for(int i =0 ; i<54 ; i++){
                      header[i]= getc(fo);   // ERROR IS HERE
                 }
                 
                 int width1 = * ( int * )&header[18];   //Width information of the image
                 int height1 = * ( int * ) &header[22];
                 int bitDepth = * ( int * ) &header[28];
                 
                 if(bitDepth <= 8 ){
                      fo.read(colorTable,1024);
                 }
                 
                 fy.write(header,54);
                 unsigned char buf[(height1*width1)];
                 fo.read(buf,(height1 * width1));
                 
                 if(bitDepth <= 8){
                      fy.write(colorTable,1024);
                 }

                 fy.write(buf,(height1*width1));
                 fy.close();
                 fo.close();
                 Serial.printf("SUCCESS");
                 EEPROM.commit();
              }
void setup() {
  WRITE_PERI_REG(RTC_CNTL_BROWN_OUT_REG, 0); //disable brownout detector
 
  Serial.begin(115200);
  //Serial.setDebugOutput(true);
  //Serial.println();
  
  camera_config_t config;
  config.ledc_channel = LEDC_CHANNEL_0;
  config.ledc_timer = LEDC_TIMER_0;
  config.pin_d0 = Y2_GPIO_NUM;
  config.pin_d1 = Y3_GPIO_NUM;
  config.pin_d2 = Y4_GPIO_NUM;
  config.pin_d3 = Y5_GPIO_NUM;
  config.pin_d4 = Y6_GPIO_NUM;
  config.pin_d5 = Y7_GPIO_NUM;
  config.pin_d6 = Y8_GPIO_NUM;
  config.pin_d7 = Y9_GPIO_NUM;
  config.pin_xclk = XCLK_GPIO_NUM;
  config.pin_pclk = PCLK_GPIO_NUM;
  config.pin_vsync = VSYNC_GPIO_NUM;
  config.pin_href = HREF_GPIO_NUM;
  config.pin_sscb_sda = SIOD_GPIO_NUM;
  config.pin_sscb_scl = SIOC_GPIO_NUM;
  config.pin_pwdn = PWDN_GPIO_NUM;
  config.pin_reset = RESET_GPIO_NUM;
  config.xclk_freq_hz = 20000000;
  config.pixel_format = PIXFORMAT_JPEG; 
  
  if(psramFound()){
    config.frame_size = FRAMESIZE_UXGA; // FRAMESIZE_ + QVGA|CIF|VGA|SVGA|XGA|SXGA|UXGA
    config.jpeg_quality = 10;
    config.fb_count = 2;
  } else {
    config.frame_size = FRAMESIZE_SVGA;
    config.jpeg_quality = 12;
    config.fb_count = 1;
  }
  
  // Init Camera
  esp_err_t err = esp_camera_init(&config);
  if (err != ESP_OK) {
    Serial.printf("Camera init failed with error 0x%x", err);
    return;
  }
  
  //Serial.println("Starting SD Card");
  if(!SD_MMC.begin()){
    Serial.println("SD Card Mount Failed");
    return;
  }
  
  uint8_t cardType = SD_MMC.cardType();
  if(cardType == CARD_NONE){
    Serial.println("No SD Card attached");
    return;
  }
    
  camera_fb_t * fb = NULL;
  
  // Take Picture with Camera
  fb = esp_camera_fb_get();  
  if(!fb) {
    Serial.println("Camera capture failed");
    return;
  }               
  // initialize EEPROM with predefined size
  EEPROM.begin(EEPROM_SIZE);
  pictureNumber = EEPROM.read(0) + 1;
  CopyNumber = EEPROM.read(0) + 1;

  // Path where new picture will be saved in SD Card
  String path = "/picture" + String(pictureNumber) +".bmp";   // Dosyanın ismi
  String copy_path = "/Copy" + String(CopyNumber) +".bmp";

  imgWriter(path.c_str(),fb->buf,fb->len,fb->width,fb->height); // WRITE FUNCION CALL
  copyImage(path.c_str(),fb->width,fb->height,copy_path.c_str()); // Copy
  esp_camera_fb_return(fb);
    
  // Turns off the ESP32-CAM white on-board LED (flash) connected to GPIO 4
  pinMode(4, OUTPUT);
  digitalWrite(4, LOW);
  rtc_gpio_hold_en(GPIO_NUM_4);
  
  delay(2000);
  Serial.println("Going to sleep now");
  delay(2000);
  esp_deep_sleep_start();
  Serial.println("This will never be printed");
}

void loop() {
}

错误是:无法将参数“1”的 'fs::File' 转换为 'FILE* {aka __sFILE*}' 到 'int getc(FILE*)'

与评论相反,从消息和代码中可以清楚地看出您的错误:

您正在尝试将 C 库函数 getc 与 ESP32 库对象 File 一起使用。

那是不可能的。 getc 无法使用此对象或任何 C++ 对象,因为它是 C 函数。

要从文件对象中读取,您需要像这样使用它的方法read

header[i] = fo.read();

您应该阅读库文档以获取有关如何使用 File 对象的更多信息,或参阅有关使用 SD 卡的教程:

https://diyi0t.com/sd-card-arduino-esp8266-esp32/