Read a file after a specific line

[kahlenberg]

Hi,
I want to read a file from a specific line to end of file.

For example the file contains following text:

GLOBAL SYMBOLS: SORTED ALPHABETICALLY BY Name 
 
page  address   name                                  
----  -------   ----                                  
abs   ffffffff  .text                                 
0     0000912a  C$$EXIT                               
0     000091c5  I$$DIV                                
0     000091d6  I$$MOD      
....
....
abs   ffffffff  binit                                 
0     00000122  cinit                                 
0     00000000  code_start                            
abs   ffffffff  etext                                 
abs   ffffffff  pinit                                 
 
 
GLOBAL SYMBOLS: SORTED BY Symbol Address 
 
page  address   name                                  
----  -------   ----                                  
0     00000000  code_start                            
0     00000122  ___cinit__                            
0     00000122  cinit                                 
0     00000144  _F28x_usDelay                         
0     00000148  _InitGpio                             
0     00000188  _GPIO_SetupPinMux                     
0     00000214  _GPIO_SetupPinOptions                 
0     000002a8  _GPIO_SetupLock                       
0     000002d1  _GPIO_SetupXINT1Gpio                  
0     000002db  _GPIO_SetupXINT2Gpio                  
0     000002e5  _GPIO_SetupXINT3Gpio                  
0     000002ef  _GPIO_SetupXINT4Gpio                  
0     000002f9  _GPIO_SetupXINT5Gpio                  
0     00000303  _GPIO_EnableUnbondedIOPullupsFor176Pin
0     0000031c  _GPIO_EnableUnbondedIOPullupsFor100Pin
0     00000341  _GPIO_EnableUnbondedIOPullups  
...

GLOBAL SYMBOLS: SORTED ALPHABETICALLY BY Name 

page  address   name                                  
----  -------   ----                                  
abs   ffffffff  .text                                 
0     0000912a  C$$EXIT                               
0     000091c5  I$$DIV                                
0     000091d6  I$$MOD      
....
....
abs   ffffffff  binit                                 
0     00000122  cinit                                 
0     00000000  code_start                            
abs   ffffffff  etext                                 
abs   ffffffff  pinit                                 


GLOBAL SYMBOLS: SORTED BY Symbol Address 

page  address   name                                  
----  -------   ----                                  
0     00000000  code_start                            
0     00000122  ___cinit__                            
0     00000122  cinit                                 
0     00000144  _F28x_usDelay                         
0     00000148  _InitGpio                             
0     00000188  _GPIO_SetupPinMux                     
0     00000214  _GPIO_SetupPinOptions                 
0     000002a8  _GPIO_SetupLock                       
0     000002d1  _GPIO_SetupXINT1Gpio                  
0     000002db  _GPIO_SetupXINT2Gpio                  
0     000002e5  _GPIO_SetupXINT3Gpio                  
0     000002ef  _GPIO_SetupXINT4Gpio                  
0     000002f9  _GPIO_SetupXINT5Gpio                  
0     00000303  _GPIO_EnableUnbondedIOPullupsFor176Pin
0     0000031c  _GPIO_EnableUnbondedIOPullupsFor100Pin
0     00000341  _GPIO_EnableUnbondedIOPullups  
...

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Questions:

1) How can I read file from the line "GLOBAL SYMBOLS: SORTED BY Symbol Address" to end of file.
2) How can I determine which line number in text file that sentence stays?
3) How can I read file from a specific line to a specific line. For example I want to read all lines only between "GLOBAL SYMBOLS: SORTED ALPHABETICALLY BY Name
" and "GLOBAL SYMBOLS: SORTED BY Symbol Address"


Thanks.

[Lesiok]

You have to read file line by line and ignore all data before and after this special lines.

[d_stranz]

1) How can I read file from the line "GLOBAL SYMBOLS: SORTED BY Symbol Address" to end of file.

As Lesiok says, you have to start reading at the first line and read the file line-by-line. Starting at line 1, you look for a line containing your "GLOBAL SYMBOLS" string. Until that point, you just read lines and throw away the information. When you find the matching line, you switch to a different mode where you do something with the information, until you find the other "GLOBAL SYMBOLS" line. Then you can stop reading.

2) How can I determine which line number in text file that sentence stays?

Create a variable to hold the line number. Start it at zero. Each time you read a line, add 1 to the value. If you need to remember where specific lines are, create other variables for that, and when you hit those lines, copy the line number variable's value into them.

3) How can I read file from a specific line to a specific line. For example I want to read all lines only between "GLOBAL SYMBOLS: SORTED ALPHABETICALLY BY Name
" and "GLOBAL SYMBOLS: SORTED BY Symbol Address"

See the answer to question 1.

// Pseudocode:
QFile  file( "MyFile.asm" );
QTextStream  textStream( &file );
int lineNumber = -1;
bool  bProcessing = false;  // Becomes true after the first "GLOBAL..." is matched
QString  line;
while ( !textStream.atEnd() )
{
    line = textStream.readLine();
    lineNumber++;
 
    if ( line == "GLOBAL SYMBOLS blah blah blah" )  // first matching case
    {
       bProcessing = true;
    }
    else if ( bProcessing )
    {
      // Do something with the line
    }
    else if ( line == "GLOBAL SYMBOLS blah de dah" ) // second matching case
    {
       break;  // Done reading
    }
}

// Pseudocode:
QFile  file( "MyFile.asm" );
QTextStream  textStream( &file );
int lineNumber = -1;
bool  bProcessing = false;  // Becomes true after the first "GLOBAL..." is matched
QString  line;
while ( !textStream.atEnd() )
{
    line = textStream.readLine();
    lineNumber++;

    if ( line == "GLOBAL SYMBOLS blah blah blah" )  // first matching case
    {
       bProcessing = true;
    }
    else if ( bProcessing )
    {
      // Do something with the line
    }
    else if ( line == "GLOBAL SYMBOLS blah de dah" ) // second matching case
    {
       break;  // Done reading
    }
}

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[kahlenberg]

Thank you very much. I just asked the question whether there is a built-in function in Qt that makes all those things. Ok I can do it with your code as well.

[d_stranz]

Your problem is much too specific for there to be something in any library that would solve it without any modification.