CSV 到 C 中的数组
我正在尝试将 CSV 文件加载到单个维度数组中。我可以输出 CSV 文件的内容，但在尝试将其复制到数组中时遇到了一些麻烦。
这是我现有的代码，我意识到它可能非常糟糕，但我正在自学：
#include <stdio.h>
#include <string.h>
#define MAX_LINE_LENGTH 1024
#define MAX_CSV_ELEMENTS 1000000
int main(int argc, char *argv[])
{
char line[MAX_LINE_LENGTH] = {0};
int varCount = 0;
char CSVArray[MAX_CSV_ELEMENTS] = {0};
FILE *csvFile = fopen("data.csv", "r");
if (csvFile)
{
char *token = 0;
while (fgets(line, MAX_LINE_LENGTH, csvFile))
{
token = strtok(&line[0], ",");
while (token)
{
varCount++;
CSVArray[varCount] = *token; //This is where it all goes wrong
token = strtok(NULL, ",");
}
}
fclose(csvFile);
}
return 0;
}
我应该有更好的方法吗？提前致谢！
I'm trying to load a CSV file into a single dimentional array. I can output the contents of the CSV file, but in trying to copy it into an array I'm having a bit of trouble.
Here is my existing code, which I realise is probably pretty bad but I'm teaching myself:
#include <stdio.h>
#include <string.h>
#define MAX_LINE_LENGTH 1024
#define MAX_CSV_ELEMENTS 1000000
int main(int argc, char *argv[])
{
char line[MAX_LINE_LENGTH] = {0};
int varCount = 0;
char CSVArray[MAX_CSV_ELEMENTS] = {0};
FILE *csvFile = fopen("data.csv", "r");
if (csvFile)
{
char *token = 0;
while (fgets(line, MAX_LINE_LENGTH, csvFile))
{
token = strtok(&line[0], ",");
while (token)
{
varCount++;
CSVArray[varCount] = *token; //This is where it all goes wrong
token = strtok(NULL, ",");
}
}
fclose(csvFile);
}
return 0;
}
Is there a better way I should be doing this? Thanks in advance!
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评论（3）
*token表示取消引用指针token，该指针是strtok找到的字符串中第一个字符的地址。这就是您的代码仅使用每个标记的第一个字符填充CSVArray的原因。您应该有一个 char 指针数组来指向标记，例如：
然后为其元素分配一个指针：
或者，您可以每次复制整个标记：
*tokenmeans dereferencing the pointertokenwhich is the address of the first character in a string thatstrtokfound. That's why your code fillsCSVArraywith just the first characters of each token.You should rather have an array of char pointers to point at the tokens, like:
And then assign a pointer to its elements:
Alternatively, you can copy the whole token each time:
你对问题线的看法是正确的。这是因为您正在分配一个指针，而不是复制文本。
尝试在这里 http://boredzo.org/pointers/ 有关指针的教程。
You are right about the problem line. It is because you are assigning a pointer, not copying the text.
Try here http://boredzo.org/pointers/ for a tutorial on pointers.
看起来您正在尝试将从
strtok返回的char *放入char数组中。我认为您想将 CSVArray 声明为：
It looks like you're trying to put the
char *that comes back fromstrtokinto thechararray.I think you want to declare
CSVArrayas: