fstream读写txt文件

参考链接：C++中对文本文件的读写（iostream方法）

头文件：

#include 
#include  //count函数头文件

读：

 int txtread(const char* txtname)
 {
	 ifstream CPULOAD_READ;
	 string strdata;
	 CPULOAD_READ.open(txtname, ios::in);  
	 if (!CPULOAD_READ.is_open())
		 return -1;
	 char lineData[1024] = {0};
	 while(CPULOAD_READ.getline(lineData, sizeof(lineData)))
	 {
		 strdata += CharToStr(lineData);
		 strdata += "n";
	 }
	 CPULOAD_READ.close();
	 return count(strdata.begin(),strdata.end(),'n'); //统计行数

 }

写：

float fValue = 0.0f;
char SendText[1000];
ofstream CPULOAD_ALL;
CPULOAD_ALL.open("CPULoad_all_1.txt", ios::out|ios::trunc); //把文件先清空再打开
//CPULOAD_HIGH.open("CPULoad_high_1.txt", ios::out|ios::app); //以追加的方式打开文件
if (!CPULOAD_HIGH.is_open())
	return 0;
time_t timep;
time (&timep); //获取time_t类型的当前时间
char tmp[64];
strftime(tmp, sizeof(tmp), "  %Y-%m-%d %H:%M:%Sn",localtime(&timep) );//对日期和时间进行格式化
sprintf_s(SendText,sizeof(SendText),"CPU Load:%3.0f%%", fValue);					
CPULOAD_ALL << SendText<<"  "<