如何解决AI Thinker ESP32-CAM卡编译错误
您好，我是微处理器C语言的初学者。我想使用.bmp函数复制copyimage()文件。按下编译按钮时会发生此错误：
#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 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->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 *）'
解决方法
与注释相反，从消息和代码中可以很清楚地看到您的错误：
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不能与此对象或任何C ++对象一起使用，因为它是C函数。
要读取文件对象，您需要像这样使用其方法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，或者参阅有关使用SD卡的本教程：
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