将CRC数据写入.txt文件

Question

看来这应该是一个基本的C ++程序，但是我对数据输出并不熟悉。

当我打印数据而不输出到文本文件时，我得到了正确的值。

example: 00150017000 181

当打印到文本文件时，这是我得到的：

11161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116

这是我的代码：

ofstream myfile;
myfile.open("C:\\CRC.txt");
for (i = 0; i < 200; i++, id++)
{
    myfile << sprintf(idstring, "%011d", id);
    myfile << printf("%s %03d\n", idstring, computeCrc(idstring));
}
myfile.close();

其他一切工作正常，我知道CRC生成正确。 只需获得正确的输出即可。

通过在调试属性命令自变量中添加“> CRC.txt”，我能够将控制台屏幕输出到文本文件，但是我只是想知道如何将ofstream方法合并到其中。

提前致谢。

Answer 1

您不会将您认为保存的内容保存到文件中。 首先，保存sprintf()函数的结果，在您的情况下为11。然后保存printf()函数的结果，在您的情况下为11 +1（空格）+ 3 +1（\\ n）= 16因此，结果是1116的200倍。

你想做什么

char tempBuf[12];
ofstream myfile;
myfile.open("C:\\CRC.txt");
for (i = 0; i < 200; i++, id++)
{
    sprintf(tempBuf, "%011d", id);
    myfile << tempBuf << ' ';        
    sprintf(tempBuf, "%03d", computeCrc(tempBuf));
    myFile << tempBuf << '\n';
}
myfile.close();

Answer 2

您正在将sprintf()和printf()返回到文件。 sprintf()和printf()的返回值是int而不是您正在创建的字符串。 要输出字符串，您需要将代码更改为

for (i = 0; i < 200; i++, id++)
{
    sprintf(idstring, "%011d", id);
    myfile << idstring;
    myfile << computeCrc(idstring) << endl;
}