Harald: 1 revision imported

2016-10-27T16:02:52Z

1 revision imported

Steinwedel at 21:09, 1 May 2007

2007-05-01T21:09:13Z

New page

Dieses Beispiel zeigt, wie Nut/OS in Verbindung mit C++ verwendet werden kann. Auch wenn die Verwendung von C++ möglich ist, sollten die Vor- und Nachteile sorgfältig abgewogen werden. Nicht nur die Resourcen können knapp sein. C++ kann die Fehlersuche komplizieren.

<pre>
// Trivial C++ Demo for NutOS.

#include <cpp/nutcpp.h>

extern "C" {
#include <dev/board.h>
#include <sys/version.h>
#include <inttypes.h>
#include <io.h>
#include <stdio.h>
}

template<class tp_type> class TemplateCounter
{
protected:
tp_type m_value;

public:
tp_type value() const { return m_value; }
void inc() { m_value++; }
void dec() { m_value--; }
void set(const tp_type &newValue) { m_value = newValue; }
};

class Counter: public TemplateCounter<uint8_t>
{
public:
void print(FILE *stream);

Counter(uint8_t initValue=10);
};

void Counter::print(FILE* stream)
{
fprintf(stream, "\nCounter value = %i\n", value());
}

Counter::Counter(uint8_t initValue)
{
m_value = initValue;
}

int main(void) {
u_long baud = 115200;

NutRegisterDevice(&DEV_UART0, 0, 0);
FILE *stream = fopen(DEV_UART0_NAME, "r+");
_ioctl(_fileno(stream), UART_SETSPEED, &baud);

fprintf(stream, "\n\nC++ Demo on Nut/OS %s ready.\n", NutVersionString());

Counter counter;
counter.print(stream);

for (;;) {
char c;
fread(&c, sizeof(c), 1, stream);

switch (c) {
case '+':
counter.inc();
counter.print(stream);
break;
case '-':
counter.dec();
counter.print(stream);
break;
case 'r':
counter.set(0);
counter.print(stream);
break;
default:
fprintf(stream, "Unknown command.\n");
}
}
}

</pre>
cppdemo.c [[Copyright]] by egnite Software GmbH

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Harald: 1 revision imported

Steinwedel at 21:09, 1 May 2007