If you’ve ever encountered the dreaded Arduino Error –‘does not name a type’ – you know how frustrating it can be. Fortunately, there’s no need to panic; this problem is easy to fix. In this blog post, we’ll explore what causes the Arduino error ‘does not name a type’, a...
unknown type name 'class'; did you mean 'labs' Arduino编译时遇到unknown type name 'class'; did you mean 'labs'这个错误,一番查资料才明白,C++和C混编导致此问题。C文件中调用了C++的函数,而C文件编译时调用的C编译器不支持C++中的类。一般可以把.c文件重命名为.cpp解决。但需要处理C文件中不符合C++...
您可以看到一个application标签,它的属性定义了应用的icon和label。这两个资源都用 xml 资源语法@resource-type/id引用。用@string/app_name引用的应用名称将取自res/values文件夹中strings.xml文件中定义的字符串。相同的资源查找语法适用于 drawables 和您将在任何 xml 文件中看到的所有其他资源。 在应用节点中,您...
tracking themicros()timestamp of the most recent position update. I can then query that timestamp from my code later, instead of callingmicros()myself which pads an unknown delay. I found the encoder library source code athttps://github.com/PaulStoffregen/Encoder. I foundanupdate()function...
// 类定义 class Adafruit_MQTT_Subscribe { public: Adafruit_MQTT_Subscribe(Adafruit_MQTT *mqttserver, const char *feedname, uint8_t q=0); void setCallback(SubscribeCallbackUInt32Type callb); void setCallback(SubscribeCallbackDoubleType callb); void setCallback(SubscribeCallbackBufferType callb...
public class HelloWorldActivity extends Activity { /* Called when the activity is first created. / @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); } }`如你所见,这个文件很小。该类必须扩展Activity类,它是 Android 系统...
class SdCard { private: char buf[128]; public: void init(); void listDir(const char *dirname, uint8_t levels); void createDir(const char *path); void removeDir(const char *path); void readFile(const char *path); String readFileLine(const char *path, int num); void writeFile(...
class SPIClass { ^ C:\Program Files (x86)\Arduino\hardware\arduino\avr\libraries\SPI\src/SPI.h:322:8: error: unknown type name 'SPIClass' extern SPIClass SPI; ^ C:\Users\user\Documents\Arduino\libraries\nRF905\nRF905.c: In function 'readConfigRegister': ...
serial.*; Serial myPort; // Create object from Serial class short portIndex = 0; // select the com port, 0 is the first port char HEADER = 'H'; void setup() { size(200, 200); // Open whatever serial port is connected to Arduino. String portName = Serial.list()[portIndex]; ...
../components/arduino/cores/esp32/IPAddress.h:29:1: error: unknown type name 'class' class IPAddress: public Printable ^~~~ ../components/arduino/cores/esp32/IPAddress.h:29:16: error: expected '=', ',', ';', 'asm' or 'attribute' before ':' token class...