Read the specified line of txtsThe following are some ways to read the specified line of the TMT:
** 1. Use the method in the C#code sample **
1. ** Method 1 **
- You can use the `File.ReadAllLines` method to read the contents of the file into a string array. The sample code is as follows:
- Assuming that `filePath` is the file path and `fileNames(i)` is the file name (this may be a file name in a file list if there are multiple files to be processed).
- `string[] lines = File.ReadAllLines(filePath + "\" + filenNames (i));`, then you can process the specified line by assigning the index of `lines`.
2. ** Method 2 **
- Use the `Stream Reader` class to read the file line by line. The example is as follows:
- First, create a `Stream Reader` object, such as `Stream Reader objReader = new Stream Reader ("c: " test.txt.");`(Here, the file path is assumed to be `c: " test.txt.`, which can be modified according to the actual situation).
- Then, define a variable to store the contents of each line, the result, and the line number count, such as `string sLine = ""; string result = string.Empty; int i = 0;`.
- Read the file line by line through the `while` loop,`while ((sLine = objReader. Read Line ())!= If `i` is equal to the specified line number you want to read (for example,`if(i == 4)`), the contents of the line will be assigned to the result variable (for example,`result = sLine;`), and the loop will be exited. Finally, the `streamReader` object will be closed (`objReader.Close();`).
** 2. Use the method in the C language code example **
1. define a function to read a specified line, such as `char'* readSpeacialLine(int i)` function (where `i` is the specified line number to be read).
- First, open the file in a binary-format format, such as `OVER * mp; Char Filename[] = "./ lining.txt'; if((fft = fopen(Filename,'rb ')) == nil)`, if the opening fails, an error message will be output and` nil `will be returned.
- Find the size of the file (through the `fseek` and `ftell` functions), and then request a space that can fit the entire file (using the `malloc` function).
- Then, read the file line by line through the `while` loop, use the `fgets` function to read a line into a character array (such as `StrLine`), and use a counter (`Current Index`) to record the currently read line number. When `Current Index` equals the specified line number `WhichLine`(namely `i`), output and return the contents of the line (there is a warning here, the original code returns the address of the local variable, which can be corrected according to the actual situation), and finally close the file and release the requested space.
- Call the function `ReadSpeacialLine` in the `main` function and pass in the specified line number (such as `ReadSpeacialLine(10);`) to read the contents of the specified line.
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