remove a line from .txt file based on some key value(LEDbrightness)

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Hi,
i want to remove a line from .txt file based on some key value(LEDbrightness).
for eg: i will have LEDbrightness=2 in .txt file . Either i need to change the value of LEDbrightness from 2 to 3 or i need to remove the entire line LEDbrightness=2 and need to add LEDbrightness=3. I am able to add that. but it is adding to the existing one.
LEDbrightness=2
LEDbrightness=3

i am not able to remove LEDbrightness=2. Please help me on this. i m really stuck in this.

Posted 17-Dec-14 7:02am

sherin.prajin

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ZurdoDev 17-Dec-14 13:18pm

Where are you stuck? Do you know how to access a text file for read/write in C++?

sherin.prajin 18-Dec-14 0:20am

i used the below code to append the text into this. i dont know how to replace/remove the existing text.
void WriteintoINI(const char* fpath,string confKey,string confVal){
FILE * pFile;
long size;
confKey.append(confVal);
pFile = fopen ( fpath , "a" );
if (pFile != NULL){

fseek (pFile, 0, SEEK_END);
size=ftell (pFile);
fputs (confKey.c_str() , pFile );
fprintf(pFile, "\n");
fclose (pFile);

}
}

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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

CPallini · Answer 1 · 2014-12-17T09:20:00

Solution 1

A simple approach is:
Read the input file line by line and copy to the output only the required/modified ones.
At the end remove the input file and properly rename the output one (for small files you may read the whole file in memory, preform the modifications and then write back it to the disk).

Posted 17-Dec-14 9:20am

CPallini

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Maciej Los 17-Dec-14 15:29pm

5ed!

remove a line from .txt file based on some key value(LEDbrightness)

1 solution

Solution 1

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remove a line from .txt file based on some key value(LEDbrightness)

1 solution

Solution 1

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