NUll character output for combobox index

[mdskpr778]

Whenever I run this bit of code it prints blank characters:

void Photo::apertureChanged()
{
 
        QString x;
        x = aperture.itemText(0);
        QByteArray i  = x.toLatin1();
        const char *c_str2 = i.data();
        printf(c_str2);
 
}

void Photo::apertureChanged()
{

        QString x;
        x = aperture.itemText(0);
        QByteArray i  = x.toLatin1();
        const char *c_str2 = i.data();
        printf(c_str2);

}

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when really its supposed to print the aperture number of combobox index 0.
it compiles fine.
Thanks in Advance

[Junior]

mdskpr778,

try:

void Photo::apertureChanged()
{
  QString x;
  x = aperture.itemText(0);
  if( !x.isEmpty() ){
    const char *c_str2 = x.toLatin1().data();
    printf(c_str2);
  } else {
    printf( "x is empty\n" );
  }
}

void Photo::apertureChanged()
{
  QString x;
  x = aperture.itemText(0);
  if( !x.isEmpty() ){
    const char *c_str2 = x.toLatin1().data();
    printf(c_str2);
  } else {
    printf( "x is empty\n" );
  }
}

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[spud]

These two lines will most likely crash your application:

const char *c_str2 = x.toLatin1().data();
printf(c_str2);

const char *c_str2 = x.toLatin1().data();
printf(c_str2);

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Use:

printf(x.toLatin1().constData());

printf(x.toLatin1().constData());

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That has to be the single most common Qt mistake.