esp32cam+qt 传输图片示例

以下是一个ESP32-CAM通过Qt传输图像的简单示例：

首先，您需要在ESP32-CAM上运行一个Web服务器，并将图像发送到客户端。这可以通过使用以下代码完成：

#include <WiFi.h>
#include <WebServer.h>
#include "esp_camera.h"

const char* ssid = "YOUR_SSID";
const char* password = "YOUR_PASSWORD";

WebServer server(80);

void handleRoot() {
  // Capture a photo
  camera_fb_t* fb = esp_camera_fb_get();
  // Send the photo to the client
  server.send_P(200, "image/jpeg", (const char*)fb->buf, fb->len);
  // Delete the photo
  esp_camera_fb_return(fb);
}

void setup() {
  // Start the camera
  camera_config_t config;
  config.ledc_channel = LEDC_CHANNEL_0;
  config.ledc_timer = LEDC_TIMER_0;
  config.pin_d0 = 5;
  config.pin_d1 = 18;
  config.pin_d2 = 19;
  config.pin_d3 = 21;
  config.pin_d4 = 36;
  config.pin_d5 = 39;
  config.pin_d6 = 34;
  config.pin_d7 = 35;
  config.pin_xclk = 0;
  config.pin_pclk = 22;
  config.pin_vsync = 25;
  config.pin_href = 23;
  config.pin_sscb_sda = 26;
  config.pin_sscb_scl = 27;
  config.pin_pwdn = 32;
  config.pin_reset = -1;
  config.xclk_freq_hz = 20000000;
  config.pixel_format = PIXFORMAT_JPEG;
  if(psramFound()){
    config.frame_size = FRAMESIZE_UXGA;
    config.jpeg_quality = 10;
    config.fb_count = 2;
  } else {
    config.frame_size = FRAMESIZE_SVGA;
    config.jpeg_quality = 12;
    config.fb_count = 1;
  }
  esp_err_t err = esp_camera_init(&config);
  if (err != ESP_OK) {
    Serial.printf("Camera init failed with error 0x%x", err);
    return;
  }
  // Connect to WiFi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");
  // Start the server
  server.on("/", handleRoot);
  server.begin();
}

void loop() {
  server.handleClient();
}

然后，您可以编写一个Qt客户端来获取图像并将其显示在Qt应用程序中。以下是一个简单的示例：

#include <QtNetwork/QNetworkAccessManager>
#include <QtNetwork/QNetworkReply>
#include <QtWidgets/QApplication>
#include <QtWidgets/QLabel>
#include <QtWidgets/QVBoxLayout>
#include <QtWidgets/QWidget>

int main(int argc, char *argv[]) {
  QApplication app(argc, argv);
  QWidget *widget = new QWidget;
  QVBoxLayout *layout = new QVBoxLayout(widget);
  QLabel *imageLabel = new QLabel(widget);
  QNetworkAccessManager *manager = new QNetworkAccessManager(widget);
  QObject::connect(manager, &QNetworkAccessManager::finished, [=](QNetworkReply *reply) {
    QByteArray jpegData = reply->readAll();
    QPixmap pixmap;
    pixmap.loadFromData(jpegData);
    imageLabel->setPixmap(pixmap.scaled(640, 480, Qt::KeepAspectRatio));
  });
  QUrl url("http://YOUR_ESP32_CAM_IP_ADDRESS");
  url.setPort(80);
  manager->get(QNetworkRequest(url));
  layout->addWidget(imageLabel);
  widget->show();
  return app.exec();
}

请确保将`YOUR_ESP32_CAM_IP_ADDRESS`替换为ESP32-CAM的IP地址。该示例将图像显示为640x480大小，并保持其纵横比。