Compare QString alphabet position

[patrik08]

compare qstring...

I search a similar QString function from php strcmp
http://php.net/strcmp to find the nummer on 2° position from a qmap...

How make this...

Example ... if your name is "zumalli" the formula take only the first 3 lovercase letter
"zum" and i musst return 993

if Your name is "zcello" take zce and from compare alphabet position i must return 979

typedef QMap<int, QStringList> TableAi;
TableAi Box_att;
Box_att.clear();
................................................
Box_att.insert(875,QStringList() << "x" <<  "975");
Box_att.insert(876,QStringList() << "z" <<  "976");
Box_att.insert(877,QStringList() << "zam" <<  "977");
Box_att.insert(878,QStringList() << "zau" <<  "978");
Box_att.insert(879,QStringList() << "zb" <<  "979");
Box_att.insert(880,QStringList() << "ze" <<  "980");
Box_att.insert(881,QStringList() << "zeh" <<  "981");
Box_att.insert(882,QStringList() << "zei" <<  "982");
Box_att.insert(883,QStringList() << "zem" <<  "983");
Box_att.insert(884,QStringList() << "zf" <<  "984");
Box_att.insert(885,QStringList() << "zi" <<  "985");
Box_att.insert(886,QStringList() << "zim" <<  "986");
Box_att.insert(887,QStringList() << "zin" <<  "987");
Box_att.insert(888,QStringList() << "zk" <<  "988");
Box_att.insert(889,QStringList() << "zo" <<  "989");
Box_att.insert(890,QStringList() << "zu" <<  "990");
Box_att.insert(891,QStringList() << "zuc" <<  "991");
Box_att.insert(892,QStringList() << "zul" <<  "992");
Box_att.insert(893,QStringList() << "zum" <<  "993");
Box_att.insert(894,QStringList() << "zun" <<  "994");
Box_att.insert(895,QStringList() << "zur" <<  "995");
Box_att.insert(896,QStringList() << "zus" <<  "996");
Box_att.insert(897,QStringList() << "zw" <<  "997");
Box_att.insert(898,QStringList() << "zwe" <<  "998");
Box_att.insert(899,QStringList() << "zy" <<  "999");
 
 
/* incomming form value  nam   */
QString firsttree="000";
QString nametree="zce";  /* must become alphabet 979  */
 
           TableAi::Iterator it;
          for ( it = Box_att.begin(); it != Box_att.end(); ++it ) { 
            QStringList itemsetter = it.value(); 
            QString letter = QString(itemsetter.at(0));
            QString nummer = QString(itemsetter.at(1));
              if (nametree > letter) {    /* compare alphabet position */
                  return nummer;
              }
           }
           /*
           original from php 
           $fp = fopen ("ahvkeys.csv","r");
                while ($data0 = fgetcsv ($fp, 1000, ",")) {
                    if(strcmp ($data0[0], $name)>0) break;
                    $data1=$data0;
                }
           $first3letternummer=$data1[1];
           
           */

typedef QMap<int, QStringList> TableAi;
TableAi Box_att;
Box_att.clear();
................................................
Box_att.insert(875,QStringList() << "x" <<  "975");
Box_att.insert(876,QStringList() << "z" <<  "976");
Box_att.insert(877,QStringList() << "zam" <<  "977");
Box_att.insert(878,QStringList() << "zau" <<  "978");
Box_att.insert(879,QStringList() << "zb" <<  "979");
Box_att.insert(880,QStringList() << "ze" <<  "980");
Box_att.insert(881,QStringList() << "zeh" <<  "981");
Box_att.insert(882,QStringList() << "zei" <<  "982");
Box_att.insert(883,QStringList() << "zem" <<  "983");
Box_att.insert(884,QStringList() << "zf" <<  "984");
Box_att.insert(885,QStringList() << "zi" <<  "985");
Box_att.insert(886,QStringList() << "zim" <<  "986");
Box_att.insert(887,QStringList() << "zin" <<  "987");
Box_att.insert(888,QStringList() << "zk" <<  "988");
Box_att.insert(889,QStringList() << "zo" <<  "989");
Box_att.insert(890,QStringList() << "zu" <<  "990");
Box_att.insert(891,QStringList() << "zuc" <<  "991");
Box_att.insert(892,QStringList() << "zul" <<  "992");
Box_att.insert(893,QStringList() << "zum" <<  "993");
Box_att.insert(894,QStringList() << "zun" <<  "994");
Box_att.insert(895,QStringList() << "zur" <<  "995");
Box_att.insert(896,QStringList() << "zus" <<  "996");
Box_att.insert(897,QStringList() << "zw" <<  "997");
Box_att.insert(898,QStringList() << "zwe" <<  "998");
Box_att.insert(899,QStringList() << "zy" <<  "999");


/* incomming form value  nam   */
QString firsttree="000";
QString nametree="zce";  /* must become alphabet 979  */

           TableAi::Iterator it;
          for ( it = Box_att.begin(); it != Box_att.end(); ++it ) { 
            QStringList itemsetter = it.value(); 
            QString letter = QString(itemsetter.at(0));
            QString nummer = QString(itemsetter.at(1));
              if (nametree > letter) {    /* compare alphabet position */
                  return nummer;
              }
           }
           /*
           original from php 
           $fp = fopen ("ahvkeys.csv","r");
                while ($data0 = fgetcsv ($fp, 1000, ",")) {
                    if(strcmp ($data0[0], $name)>0) break;
                    $data1=$data0;
                }
           $first3letternummer=$data1[1];
           
           */

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[patrik08]

I solved....

strcmp is a php function & a c++

if (strcmp(ainame,yourname) > 0) { break; } register the qmap position

and take position - 1 value ... thats it... tanksss

[rickbsgu]

Just a few notes on operators that you might find useful. From your original code:

TableAi::Iterator it;          
           for ( it = Box_att.begin(); it != Box_att.end(); ++it )
           { 
              QStringList itemsetter = it.value();
              QString letter = QString(itemsetter.at(0));
              QString nummer = QString(itemsetter.at(1));
              if (nametree > letter)
              {    
                   /* compare alphabet position */
                   return nummer; 
              } 
            }

TableAi::Iterator it;          
           for ( it = Box_att.begin(); it != Box_att.end(); ++it )
           { 
              QStringList itemsetter = it.value();
              QString letter = QString(itemsetter.at(0));
              QString nummer = QString(itemsetter.at(1));
              if (nametree > letter)
              {    
                   /* compare alphabet position */
                   return nummer; 
              } 
            }

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You should be able to do this:

TableAi::Iterator it; 
           for ( it = Box_att.begin(); it != Box_att.end(); ++it )
           { 
              QString letter = it[0];
              QString nummer = it[1]);
              if (nametree > letter)
              {    
                   /* compare alphabet position */
                   return nummer; 
              } 
 
              return QString::null;     // have to return something if fallthrough

TableAi::Iterator it; 
           for ( it = Box_att.begin(); it != Box_att.end(); ++it )
           { 
              QString letter = it[0];
              QString nummer = it[1]);
              if (nametree > letter)
              {    
                   /* compare alphabet position */
                   return nummer; 
              } 

              return QString::null;     // have to return something if fallthrough

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Notes:

• The iterator acts as an instance of the object in the array.
• You don't need to wrap the itemsetter returns in a QString() wrapper - in fact, that's kind of wasteful, since it creates a copy that you don't need (although QString does optimize copies under the covers to point to the same string. Still, unless you're going to change the copy, it's a waste.)

Taking it further:

enum ItemIndexes { LETTER, NUMBER }
        //  (do this somewhere)
        // might want to wrap in a namespace or class somewhere, or prefix
        // the items to guarantee uniqueness
 
           TableAi::Iterator it; 
           for ( it = Box_att.begin(); it != Box_att.end(); ++it )
                if (nametree > it[LETTER])  /* compare alphabet position */
                   return it[NUMBER]; 
 
           return QString::null;      // Have to return something if fallthrough

enum ItemIndexes { LETTER, NUMBER }
        //  (do this somewhere)
        // might want to wrap in a namespace or class somewhere, or prefix
        // the items to guarantee uniqueness

           TableAi::Iterator it; 
           for ( it = Box_att.begin(); it != Box_att.end(); ++it )
                if (nametree > it[LETTER])  /* compare alphabet position */
                   return it[NUMBER]; 

           return QString::null;      // Have to return something if fallthrough

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In fact, I think if you're using Qt4, you can use the 'foreach' keyword on iterators.

Consolidating the code makes the logic more apparent - in doing this, I discovered you weren't returning anything on fallthrough & added that.

rickb

[patrik08]

Your method not run on qt4....

strcmp wand char .... a qt similar function not exist....

TableAi::Iterator it;
          for ( it = Box_att.begin(); it != Box_att.end(); ++it ) { 
            loop++;  /* register the map position to take value one before break */
              if (strcmp(it[0],yourname) > 0) { break; }
           }

TableAi::Iterator it;
          for ( it = Box_att.begin(); it != Box_att.end(); ++it ) { 
            loop++;  /* register the map position to take value one before break */
              if (strcmp(it[0],yourname) > 0) { break; }
           }

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gui_main.cpp:1069: error: cannot convert `QMapData::Node' to `const char*' for a
rgument `1' to `int strcmp(const char*, const char*)'
mingw32-make[1]: *** [build\.o\win32\gui_main.o] Error 1
mingw32-make[1]: Leaving directory `C:/_0000_current/src_datum'

[jacek]

strcmp wand char .... a qt similar function not exist....

On the contrary, it does exist: http://doc.trolltech.com/4.1/qstring.html#compare