ostream::write函数的类型转换问题
初学C++，对IO函数还不是太了解，因此错误百出啊。。。

#include "..\datalog.h"
#include <fstream.h>
#include <stdlib.h>
#include <string.h>

using namespace std;

int main()
{
ofstream data("data.txt");
ofstream bindata("data.bin",ios::binary);
time_t timer = time(NULL);//get time
//seed random generator:
srand((unsigned)timer);
for(int i = 0;i<100;i++)
{
datapoint d;
//convert date/time to a structure:
d.Time(*localtime(&timer));
timer += 55;
d.latitude("45*20'31\"");
d.longitude("22*34'18\"");
//zero to 199 meters:
double newdepth = rand() % 200;
double fraction = rand() % 100 + 1;
newdepth += double(1)/fraction;
d.depth(newdepth);
double newtemp = 150 + rand()%200;
fraction = rand() % 100 + 1;
newtemp += (double)1/fraction;
d.temperature(newtemp);
d.print(data);
bindata.write((unsigned char*)&d,sizeof(d));//这里出问题了
}
}


||=== 生成测试数据, Debug ===|
\main.cpp|33|error: invalid conversion from `unsigned char*' to `const char*'|
\main.cpp|33|error: initializing argument 1 of `std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::write(const _CharT*, std::streamsize) [with _CharT = char, _Traits = std::char_traits<char>]'|
||=== Build finished: 2 errors, 1 warnings ===|


[解决办法]