English 中文(简体)
查阅档案中的部分错误
原标题:Segmentation fault in file accessing

我只想问,这部法典为何造成分裂性错。 我试图从文本档案中获取意见,我可以说明问题是什么。

using namespace std; 
using namespace cv;

int main()
{
    char str[50];
    FILE *trainfile;
    int k, n, maxval1, maxval2, classnum;
    char dataArray[n][3];

    trainfile = fopen("training.txt", "r+");

    if(trainfile == NULL){
        perror("Cannot open file.
");
    }else{
        while(!feof(trainfile)){
            fscanf(trainfile, "%s", str);       
        }
    }
    fclose(trainfile);

    return 0;
}
最佳回答

一个问题是,你的缓冲可能不够大。

你们应首先掌握档案的大小,然后对档案进行动态的缓冲。

fseek(trainfile,0,SEEK_END); //Go to end
int size = ftell(trainfile); //Tell offset of end from beginning
char* buffer = malloc(size); //Make a buffer of the right size

fseek(ftrainfile,0,SEEK_SET); //Rewind the file

//Read file here with buffer
问题回答
int k, n, maxval1, maxval2, classnum;
char dataArray[n][3];

<>代码>n>不适用。 不详。

err...its not used anyways.

守则的另一个问题是你的数据缓冲:

char str[50];

档案内容可能并不重要,因此,它会造成 Un Defin Behavior





相关问题
Fastest method for running a binary search on a file in C?

For example, let s say I want to find a particular word or number in a file. The contents are in sorted order (obviously). Since I want to run a binary search on the file, it seems like a real waste ...

Print possible strings created from a Number

Given a 10 digit Telephone Number, we have to print all possible strings created from that. The mapping of the numbers is the one as exactly on a phone s keypad. i.e. for 1,0-> No Letter for 2->...

Tips for debugging a made-for-linux application on windows?

I m trying to find the source of a bug I have found in an open-source application. I have managed to get a build up and running on my Windows machine, but I m having trouble finding the spot in the ...

Trying to split by two delimiters and it doesn t work - C

I wrote below code to readin line by line from stdin ex. city=Boston;city=New York;city=Chicago and then split each line by ; delimiter and print each record. Then in yet another loop I try to ...

Good, free, easy-to-use C graphics libraries? [closed]

I was wondering if there were any good free graphics libraries for C that are easy to use? It s for plotting 2d and 3d graphs and then saving to a file. It s on a Linux system and there s no gnuplot ...

Encoding, decoding an integer to a char array

Please note that this is not homework and i did search before starting this new thread. I got Store an int in a char array? I was looking for an answer but didn t get any satisfactory answer in the ...

热门标签