Question

我正在使用读取和处理结构化文件的函数：

fname=strcat(folder,'\',fname);
FID=fopen(fname);
% reading lines and digging and procsesing data using fgetl() and regexp()
fclose(FID);

当读取和挖掘部分出现任何错误时，将抛出错误消息，但文件已打开且FID指针丢失。它主要是由缺失或错误的线引起的。

如何在发生错误时避免丢失FID指针（用于手动关闭）和/或在发生错误时执行fclose(FID)？或者有没有办法打开一个文件而不用锁定它？

Answer 1

也许使用try-catch块。事实上，你甚至不需要catch：

fname = strcat(folder,'\',fname); %\\'
FID = fopen(fname);
try
    %// reading lines and digging and procsesing data using fgetl() and regexp()
    %// errors in this part are not shown
end
fclose(FID); %// this gets executed even if there were errors in reading and digging

或者，如果您想显示错误：

fname = strcat(folder,'\',fname); %\\'
FID = fopen(fname);
try
    %// reading lines and digging and procsesing data using fgetl() and regexp()
catch
    e = lasterror;
    fprintf(2,'%s\n',e.message); %// show message in red
end
fclose(FID); %// this gets executed even if there were errors in reading and digging

或显示错误但首先关闭文件：

fname = strcat(folder,'\',fname); %\\'
FID = fopen(fname);
try
    %// reading lines and digging and procsesing data using fgetl() and regexp()
catch ME
    fclose(FID); %// close file
    error(ME.message) %// issue error
end
fclose(FID);

发生错误时完成脚本/功能执行

1 个答案: