Width as a variable when using fscanf

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I am trying to read in a certain portion of a file and that amount of data is different per line but I know how how many bytes of info I want. Like this:

5bytes.byte1byte2byte3byte4byte5CKSum //where # of bytes varies for each line (and there is no period only there for readability)  

Actual data:

05AABBCCDDEE11
03AABBCC22
04AABBCCDD33

So I want to have my width be a variable like this:

fscanf_s(in_file,"%variableX", &iData);  

Is this possible, because right now I'm thinking I have to create a case statement?

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