<![CDATA[QAxObject writing cell more than column 16600 crashing application]]>Hello,

It's too wired working of QAxObject,
Whenever I tried to access cell more 16600 its crashing the application, where writing between this range working fine.

I have debug it writing directly like this:

  QAxObject* excel = new QAxObject( "Excel.Application", 0);
  excel->setProperty( "DisplayAlerts", 0);

  excel->dynamicCall("SetScreenUpdating(bool)", false);
  excel->dynamicCall("SetDisplayAlerts(bool)", false);

  QAxObject* workbooks = excel->querySubObject( "Workbooks" );
  workbooks->querySubObject( "Open(const QString&)", filepath);

  QAxObject* workbook = excel->querySubObject("ActiveWorkBook");

  QAxObject* sheets = workbook->querySubObject( "Worksheets" );

QAxObject* sheet = sheets->querySubObject("Item(int)", count);

sheet->querySubObject("Cells(int,int)", 10, 16600)->setProperty("Value", QString("SomeData"));

As soon is hit this last statement, the application crashes.

Can someone please help me what I'm missing here ?

Thanks :)

]]>https://forum.qt.io/topic/114376/qaxobject-writing-cell-more-than-column-16600-crashing-applicationRSS for NodeMon, 21 Sep 2026 00:41:21 GMTSun, 03 May 2020 13:44:08 GMT60<![CDATA[Reply to QAxObject writing cell more than column 16600 crashing application on Sun, 03 May 2020 13:49:24 GMT]]>@npatil15
So presumably it's crashing because you don't test the result of sheet->querySubObject("Cells(int,int)", 10, 16600), which maybe is returning nullptr?

And if 16,600 is number of columns in your code (would help if you said), have you looked the limits of your Excel? E.g. I can't vouch for it, but https://answers.microsoft.com/en-us/msoffice/forum/all/what-is-the-maximum-number-of-columns-in-a/5a053135-4865-e011-8dfc-68b599b31bf5

in an Excel 2007-2010 format worksheet (in a .xlsx, .xlsm or .xlsb workbook) 16.384 columns (A ... XFD).

Quite why you want 16k columns I can't imagine....

]]>https://forum.qt.io/post/592283https://forum.qt.io/post/592283Sun, 03 May 2020 13:49:24 GMT<![CDATA[Reply to QAxObject writing cell more than column 16600 crashing application on Sun, 03 May 2020 14:22:20 GMT]]>You were right, I'm accessing large range for coloum which is somewhere wrong because of my uninitialized variable mistakenly.

But thank you so much, I was unaware of this key knowledge of excel max limits.

Thanks :)

]]>https://forum.qt.io/post/592289https://forum.qt.io/post/592289Sun, 03 May 2020 14:22:20 GMT<![CDATA[Reply to QAxObject writing cell more than column 16600 crashing application on Sun, 03 May 2020 13:49:24 GMT]]>@npatil15
So presumably it's crashing because you don't test the result of sheet->querySubObject("Cells(int,int)", 10, 16600), which maybe is returning nullptr?

And if 16,600 is number of columns in your code (would help if you said), have you looked the limits of your Excel? E.g. I can't vouch for it, but https://answers.microsoft.com/en-us/msoffice/forum/all/what-is-the-maximum-number-of-columns-in-a/5a053135-4865-e011-8dfc-68b599b31bf5

in an Excel 2007-2010 format worksheet (in a .xlsx, .xlsm or .xlsb workbook) 16.384 columns (A ... XFD).

Quite why you want 16k columns I can't imagine....

]]>https://forum.qt.io/post/592283https://forum.qt.io/post/592283Sun, 03 May 2020 13:49:24 GMT