[英]C Programming - Read specific line from text file
int main()
{
struct vinnaren
{
char vinnare[20];
int artal;
};
struct vinnaren v[10];
int inputrader;
int antalrader; //I want antalrader to be equal to the first
//line in test.txt(the first line is "5")
char file_name[256] = "test.txt";
char buf[512];
FILE *f = fopen(file_name, "r");
if (!f)
{
exit(0);
}
while (fgets(buf, sizeof buf, f))
{
printf("%s", buf);
}
fclose(f);
}
This is the code I have.这是我的代码。 I want to make it so that antalrader = line1 in the file test.txt How do I read a specific line from the file?
我想让 antalrader = line1 在文件 test.txt 如何从文件中读取特定行?
With this code you can read a file line by line and hence read a specific line from the text file:使用此代码,您可以逐行读取文件,从而从文本文件中读取特定行:
lineNumber = x;
static const char filename[] = "file.txt";
FILE *file = fopen(filename, "r");
int count = 0;
if ( file != NULL )
{
char line[256]; /* or other suitable maximum line size */
while (fgets(line, sizeof line, file) != NULL) /* read a line */
{
if (count == lineNumber)
{
//use line or in a function return it
//in case of a return first close the file with "fclose(file);"
}
else
{
count++;
}
}
fclose(file);
}
else
{
//file doesn't exist
}
I got a really simple answer but I don't know if it is helping anyone:我得到了一个非常简单的答案,但我不知道它是否对任何人有帮助:
int OpenCommand(int idOfCommand)
{
fscanf(file_ptr, "%[^idOfCommand]",a[idOfCommand]);
printf("%d\n", a[idOfCommand]);
system("pause");
return 0;
}
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