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C language learned by suffering
C language learned by suffering

How to get file size

I would like to know the file size, what is the function for that?
There is no function in C to know the file size.
To find out the file size, open the file and then move the file pointer to find it.

 fpos_t GetFileSize(const char* FileName[])
    fpos_t fsize = 0;

    FILE* fp = fopen(FileName, "rb");

    /* Examine file size */
    fseek(fp, 0, SEEK_END);
    fgetpos(fp, &fsize);


    return fsize;

fpos_t is a variable meaning the size of the data, which is actually an unsigned integer; changing it to an int is not much of a problem.
Also, the above process changes the file pointer, i.e., the current read position, so the following is used to change it back.

 fpos_t fsize = 0;
fpos_t fsizeb = fseek(fp,0,SEEK_END);

About this Site

The C language (bitter C), which is learned by suffering, is
This is the definitive C language introductory site.
It systematically explains the basic functions of the C language and
It is as complete as or more complete than any book on the market.

Part 0: Program Overview
  1. What is the program?
Chapter 2: How to write a program
  1. Writing Rules
  2. Writing conventions
  3. Exercise 2
Chapter 3: Display on Screen
  1. String display
  2. newline character
  3. Exercise 3
Chapter 4: Numeric Display and Calculation
  1. Numeric Display
  2. Basic Calculations
  3. Type of value
  4. Exercise 4
Chapter 5: Numerical Memory and Calculation
  1. Memorize values
  2. Variable Type
  3. Type conversion
  4. Numeric justification
  5. Exercise 5
Chapter 6: Input from the keyboard
  1. Functions for input
  2. Fear of Input
  3. Exercise 6
Chapter 9: Repetition with a fixed number of times
  1. Sentences that repeat themselves
  2. Loop Operation Mechanism
  3. Exercise 9
Chapter 10: Unknown number of repetitions
  1. Loop of unknown frequency
  2. input check
  3. Exercise 10
Chapter 13: Handling Multiple Variables at Once
  1. Multiple variables are handled together.
  2. How to use arrays
  3. Exercise 13
Chapter 19: Dynamic Arrays
  1. Create arrays at will
  2. Exercise 19
Chapter 20: Multiple Source Files
  1. Minimal division
  2. The Stone of Partition
  3. Exercise 20


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