C Read Delimited Text File Into Array
How do you read tab delimited strings from a txt file and put them into variables? I wanted to read the first two fields of a TAB-delimited file into string vars, then read the remainder of each line into a final string var. How to write and read (including spaces) from text file. After the below, make the appropriate array, then go through the file again and read in between the delimit indices from each read line, convert to double and insert into the array. I want to read the every line into a Structure. I have a code to read the data to char buffer. But I want to load the data into a Structure. Read tab delimited file to Structure in C. Ask Question 3. Browse other questions tagged c file input struct tab-delimited-text or ask your own question. I have a text file that I need to search records in. The records are saved line by line in this format ID NAME SCORE1 SCORE2 SCORE3. They are all separated by a tab space. Read comma delimited text file into an a. Read comma delimited text file into an array. I need to read a comma delimted text file into an array. The file contents will be like this: (85 rows actual by 9 columns) 1,2,4,4,0,30,15,7.6,5 1,2,4,5,0,0,0,0,0 1,3,2,1,0,40,29,14,9.6. A record is a list of doubles separated by commas. Reading delimited text file to an array. Getting the results into a string and splitting them. How to read text file with comma delimiter Using ODBC.
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There isn’t much in Example 4-32 that hasn’t been covered already. I discussed getline in Recipe 4.19 and vectors in Recipe 4.3. The only piece worth mentioning has to do with memory allocation.
loadCSV creates a new vector for each line of data it reads in and stores it in yet another vector of pointers to vectors. Since the memory for each of these vectors is allocated on the heap, somebody has to de-allocate it, and that somebody is you (and not the vector implementation).
The vector has no knowledge of whether it contains a value or a pointer to a value, or anything else. All it knows is that when it’s destroyed, it needs to call the destructor for each element it contains. If the vector stores objects, then this is fine; the object is properly destroyed. But if the vector contains pointers, the pointer is destroyed, but not the object it points to.
There are two ways to ensure the memory is freed. First, you can do what I did in Example 4-32 and do it manually yourself, like this:
Or you can use a reference-counted pointer, such as the Boost project’s smart_ptr, which will be part of the forthcoming C++0x standard. But doing so is nontrivial, so I recommend reading up on what a smart_ptr is and how it works. For more information on Boost in general, see the homepage at www.boost.org.
I currently have this:
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My text file is formatted like this (10 lines of text, with 4 items on each line separated by commas):
I'm not sure what I need after the '=' in the for loop to get it to read and split the contents of the text file into the 2D array.
4 Answers
I'm not sure what I need after the '=' in the for loop
There's also a line missing above it:
Now the line with = would look like this:
This doesn't use StreamReader, but it's short and easy to understand:
Rows are extracted by ReadAllLines according to newline. Columns values are extracted by calling Split on every line. It returns jagged array that you can use similarly to multidimensional array, also jagged arrays are generally faster than multidimensional arrays.
I'd suggest you to change the approach.
Go over the file using ReadLine() method of a StreamReader class.Then split the read line using Split(new[]{','}), and this will give you every single record.And finally the sQuestionAnswers[iCountLine, iCountAnswer] will be: the just Split array's [iCountAnswer]'s record.
