首页 \ 问答 \ Linux内核编程：“无法处理内核NULL指针解除引用”(Linux Kernel Programming: “Unable to handle kernel NULL pointer dereference”)

Linux内核编程：“无法处理内核NULL指针解除引用”(Linux Kernel Programming: “Unable to handle kernel NULL pointer dereference”)

 我正在写一个Linux模块（内核编程），我正在得到： 
 

 “无法处理内核NULL指针解除引用” 
 

 这是什么意思？ 

I'm writting a Linux module (Kernel Programming), and I`m getting:
 

"Unable to handle kernel NULL pointer dereference"
 

What does it mean?

原文：https://stackoverflow.com/questions/341422
更新时间：2022-04-24 08:04

最满意答案

 如果要逐行遍历文件，可以打开文件，然后使用fscanf解析每一行。 
 

fid = fopen(filename);

while true
    % Read the next 16 integers
    data = fscanf(fid, '%d', 16);

    % Go until we can't read anymore
    if isempty(data)
        break
    end
end

 

 如果您希望每一行都作为字符串，则可以使用fgetl来获取每一行 
 

fid = fopen(filename);

% Get the first line
line = fgetl(fid);

while line
    % Do thing

    % Get the next line
    line = fgetl(fid);
end


If you want to iterate through the file, line-by-line, you can open the file and then use fscanf to parse out each line.
 

fid = fopen(filename);

while true
    % Read the next 16 integers
    data = fscanf(fid, '%d', 16);

    % Go until we can't read anymore
    if isempty(data)
        break
    end
end

 

If you want each line as a string, you can instead use fgetl to get each line
 

fid = fopen(filename);

% Get the first line
line = fgetl(fid);

while line
    % Do thing

    % Get the next line
    line = fgetl(fid);
end

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