將CRC數據寫入.txt文件

Question

看來這應該是一個基本的C ++程序，但是我對數據輸出並不熟悉。

當我打印數據而不輸出到文本文件時，我得到了正確的值。

example: 00150017000 181

當打印到文本文件時，這是我得到的：

11161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116111611161116

這是我的代碼：

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生成正確。 只需獲得正確的輸出即可。

通過在調試屬性命令自變量中添加“> CRC.txt”，我能夠將控制台屏幕輸出到文本文件，但是我只是想知道如何將ofstream方法合並到其中。

提前致謝。

Answer 1

您不會將您認為保存的內容保存到文件中。 首先，保存sprintf()函數的結果，在您的情況下為11。然后保存printf()函數的結果，在您的情況下為11 +1（空格）+ 3 +1（\\ n）= 16因此，結果是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

您正在將sprintf()和printf()返回到文件。 sprintf()和printf()的返回值是int而不是您正在創建的字符串。 要輸出字符串，您需要將代碼更改為

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