c - 打印到文件时如何正确对齐

Question

我有这个结构，我需要将其元素写入文本文件

struct Stage3ADisplay
{
    int nSlot;
    char *Item;
    char *Type;
    int nIndex;
    unsigned char attributesMD[17]; //the last character is \0
    unsigned char contentsMD[17]; //only for regular files - //the last character is \0
};  

buffer = malloc(sizeof(Stage3ADisplayVar[nIterator]->nSlot) + sizeof(Stage3ADisplayVar[nIterator]->Item) + sizeof(Stage3ADisplayVar[nIterator]->Type) + sizeof(Stage3ADisplayVar[nIterator]->nIndex) + sizeof(Stage3ADisplayVar[nIterator]->attributesMD) + sizeof(Stage3ADisplayVar[nIterator]->contentsMD) + 1);

sprintf (buffer,"%d %s %s %d %x %x",Stage3ADisplayVar[nIterator]->nSlot, Stage3ADisplayVar[nIterator]->Item,Stage3ADisplayVar[nIterator]->Type,Stage3ADisplayVar[nIterator]->nIndex,Stage3ADisplayVar[nIterator]->attributesMD,Stage3ADisplayVar[nIterator]->contentsMD);

如何确保文件中的行正确对齐。谢谢。

Answer 1

如果您的问题与 sprintf 相关，

改变

 sprintf (buffer,"%d %s %s %d %x %x"

到

 sprintf (buffer,"%22.22d %22.22s %22.22s %22.22d %22.22x %22.22x"

看看 %nn.nn 是如何工作的。