Question

这似乎应该是一个基本的C ++过程，但我不熟悉数据输出。

当我打印数据而不输出到文本文件时，我得到正确的值。

example: 00150017000 181

打印到文本文件时，这就是我得到的：

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();

其他一切正常，我知道CRC生成正确。只需要获得正确的输出。

我可以通过添加＆＃34;＆gt;输出控制台屏幕到文本文件CRC.txt＆＃34;调试属性命令参数，但我只想知道如何将ofstream方法合并到此。

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auto函数的结果，在你的情况下为11.然后你保存sprintf()函数的结果，在你的情况下是11 + 1（空格）+ 3 + 1（\ n）= 16.所以结果是1116的200倍。

你想做什么

printf()

Answer 2

您正在退回sprintf()和printf()到该文件。 sprintf()和printf()的返回值为int，而不是您创建的字符串。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;
}

将CRC数据写入.txt文件

2 个答案: