[matlab] download originality documents based on oil monkey script and MATLAB

Preface

   Recently, I found a script in the oil monkey , interesting , It can download documents that allow preview , This is a very common script , The principle is probably Auto screenshot to get pictures , Then I'll synthesize it for you PDF file . This is why only those documents that can be previewed can be downloaded .
   But the interesting thing about this script is , It just doesn't give you the last step , Just give you a link containing all the photos of the document , I guess it should upload these downloaded pictures to a drawing bed , Then link its picture bed Summarize into a table in , As for why we don't do the last step of downloading pictures locally , I dare not talk about the idea of the boss , All in all , This script is very inconvenient to use .
   So there is this blog , Try to use “ There's nothing but having children ” Of MATLAB To solve “ Last mile ” .

Code display

%GETPICTURE  Open a link containing pictures Excel form , And download the corresponding pictures 
function getpicture(filename) % Input filename Is the absolute path of the table 
    expression = '\w*\.csv$'; % Regular expressions , Used to remove the last level file name 
    end_pos = regexp(filename, expression, 'start'); % Get the cut-off position 
    path = extractBefore(filename, end_pos); % Keep the path before the end position —— Up path 
    out_path = strcat(path, 'pic_out'); % Set the path of the output picture , Keep the same directory as the original file , Name is customizable 
    mkdir(out_path); % You have to create this path first , because imwrite Function does not support creating nonexistent folders 
    [~, txt, ~] = xlsread(filename); % Read the file , Keep the string 
    for i = 1:length(txt) % Traverse all links 
        pic = webread(txt{
    i}); % Download the pictures 
        pic_path = strcat(out_path, '\', num2str(i), '.png'); % Determine the path and name of the picture 
        imwrite(pic, pic_path); % Save the picture 
        fprintf(" Downloaded %d A picture \n", i); % For displaying progress 
    end
    fprintf(" The download \n");
end

   The comments in the code are very clear , I feel like MATLAB Basic basic can understand , The final effect is to create a pic_out Folder , It stores the downloaded pictures , As shown in the figure below .

in addition , The resulting table file is shown in the figure below .

pic_out The folder is shown below .

Function summary

   This is for convenience , Briefly summarize some functions used , See the help document for specific usage .

• regexp—— Used to match regular expressions
  out = regexp(str, expression, outkey) return outkey Specified output . for example , If outkey by 'match', be regexp Returns the substring that matches the expression instead of its start index .outkey The usual values are ：
  

attach ： Reference link    See the help document for specific usage suggestions , This linked blog is also from the help document .

• extractBefore—— Get the character substring before a certain position of the string
  MATLAB The commonly used string processing functions in can see this The official link .

   What needs to be added here is xlsread Function to get cell Type of data more reflects a Data form , Its data format （string,double,int） Or depends on the contents of the file . Let's say I set txt After output , Then you can read the string in the table , It's just When using data, the format should be correct , According to cell Type used {}.

• strcat—— Connection string , Just like the one above , It is also a string handler
• webread—— Function to read web page data
  At first, I want to be in MATLAB Find a function that can download online pictures , eureka urlwrite function , Open it Help document , It is found that this function is not recommended , It's recommended webwrite and webread, Here is a download , So it's using webread, And then according to Help document The case given can be explored .
• imwrite—— Save image data locally
  Use webread The image data obtained is actually the binary code of the image , If you want to check it yourself , have access to imshow function , If you need to save to local , Then you need to use imwrite Function , But one problem here is imwrite It seems impossible to write a nonexistent path （ It cannot create its own path ）, Will report an error without permission . So it's using imwrite Function before , First use mkdir Create a path .