我目前正在学习如何为我的mbed电子项目编写自己的库。到目前为止,我有两个文件cfextensions.cpp和cfextensions.h文件。我在cfextensions.h构造函数中引用了我的变量,并在我的cfextensions.cpp文件中更改了它们的值;但是,我的MBED C 编译器投掷:标识符" Phmin"是未识别的。我的代码是:
文件:cfextensions.h /* 文件:cfextensions.h
Header file for cfExtensions Library.
*/
#ifndef __cfExtns_H
#define __cfExtns_H
#include "mbed.h"
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
//==================================
// Definitions
//==================================
#define CF_FILE_LOCATION "local/settings.cf" // File location local/settings.cf
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
//==================================
// cfExtension Class
//==================================
class cfExtensions
{
public:
//---------------------------
// Function Prototypes
//---------------------------
cfExtensions(); // Constructor, Initialisation tasks
void loadConfigFile(); // Loads config file defined in CF_FILE_LOCATION
void checkConfigForFirstStart(); // Check if MBED startup is the very first startup
void getPhMaxValueFromConfigFile(); // Get PH Max value from config file
void getPhMinValueFromConfigFile(); // Get PH Min value from config file
void getKeyAndValue();
//---------------------------
// Variables
//---------------------------
volatile bool pingTicked;
bool linkedWithBaseStation;
char *sbNameKey;
char sbNameValue[BUFSIZ];
char *sbFirstStartKey;
char sbFirstStartValue[BUFSIZ];
char *sbUseBaseStationKey;
char sbUseBaseStationValue[BUFSIZ];
char *sbPhMaxKey;
char sbPhMaxValue[BUFSIZ];
char *sbPhMinKey;
char sbPhMinValue[BUFSIZ];
float phMax;
float phMin;
//---------------------------
// Devices
//---------------------------
};
#endif
文件:cfextensions.cpp
//================================ // Get PH Min Value from CF //================================ void getPhMinValueFromConfigFile() { /* * Get a configuration value. * Then attach the sbNameValue to SensorData json */ if (cfg.getValue(sbPhMinKey, &sbPhMinValue[0], sizeof(sbPhMinValue))) { phMin = atof(sbPhMinValue); } } // End of getPhMinValueFromConfigFile
我认为它应该是cfextensions.cpp文件中的 void cfExtensions::getPhMinValueFromConfigFile() { }
。
在CPP文件中将函数实现更改为
void cfExtensions::getPhMinValueFromConfigFile() {
// etc ....
}
这里的关键是要使cfextensions ::在功能前。