c++ - QPainter crashed with QT 4.8.6 in iOS 10.6.8 -

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as title, using qt4.8.6.

i design ui paint on qwidget in ios 10.6.8.

it works fine in ubuntu 14, same code crash in ios.

i got following error message:

wed nov 12 22:33:01 macbook1.local main[75787] <error>: cgcontextsetlinedash: invalid context 0x0 wed nov 12 22:33:01 macbook1.local main[75787] <error>: cgcontextsetstrokecolorwithcolor: invalid context 0x0 wed nov 12 22:33:01 macbook1.local main[75787] <error>: cgcontextsetfillcolorwithcolor: invalid context 0x0 wed nov 12 22:33:01 macbook1.local main[75787] <error>: cgcontextsetshouldantialias: invalid context 0x0 wed nov 12 22:33:01 macbook1.local main[75787] <error>: cgcontextsetfontsize: invalid context 0x0 wed nov 12 22:33:01 macbook1.local main[75787] <error>: cgcontextgettextmatrix: invalid context 0x0 wed nov 12 22:33:01 macbook1.local main[75787] <error>: cgcontextsettextmatrix: invalid context 0x0 wed nov 12 22:33:01 macbook1.local main[75787] <error>: cgcontextsettextdrawingmode: invalid context 0x0 wed nov 12 22:33:01 macbook1.local main[75787] <error>: cgcontextsetfont: invalid context 0x0 wed nov 12 22:33:01 macbook1.local main[75787] <error>: cgcontextsettextposition: invalid context 0x0 wed nov 12 22:33:01 macbook1.local main[75787] <error>: cgcontextshowglyphswithadvances: invalid context 0x0

and paintevent code:

void widget_captcha::paintevent(qpaintevent* e) {     if(this->canroll)     {         this->showwidget->update();         rollchar_font();         this->canroll=false;     }     qpainter p(this->showwidget);      // p.setbackgroundmode(qt::transparentmode );      qcolor color[11]=     {         qt::black,         qt::darkred,         qt::darkgreen,         qt::darkblue,         qt::darkcyan,         qt::darkmagenta,         qt::darkyellow,         qt::darkgray,         qt::cyan,         qt::magenta,         qt::gray     };      qtransform trans[5];     trans[0].translate(0,0);     trans[0].rotate(0);     trans[0].scale(1.1,1);      trans[1].translate(5, 0);     trans[1].rotate(10);     trans[1].scale(1, 0.5);      trans[2].translate(5, 5);     trans[2].rotate(-5);     trans[2].scale(0.9, 1.1);      trans[3].translate(0, 35);     trans[3].rotate(0);     trans[3].scale(0.9, 0.4);      trans[4].translate(0, 5);     trans[4].rotate(0);     trans[4].scale(0.9, 0.4);      for(int i=0;i<6;i++)     {         p.settransform(trans[this->itransform[i]]);         p.setfont(this->font[i]);         qpen pen(color[this->icolor[i]],5);         p.setpen(pen);         p.drawtext(38*i, 50,this->code[i]);     } }

thank you.


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