properties - Why is happened property write error? -

c++ : run time error happened error message this.

"revstrings1-> height of reading included in error: property write-protected."

("revstrings1->height の読み込中のエラー : プロパティは書き込み禁止です.")

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i'm using c++ builder 3.

this source code can compiled setting library, include path , etc.

but run time error happened.

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i guess problem property read & write.

how can simplly fix problem ?

a variable 'revstrings1' created class 'trevstrings'.

      //---------------------------------------------------------------------------     #ifndef revstringsh     #define revstringsh     //---------------------------------------------------------------------------     #include      #include      #include      #include      #include      //---------------------------------------------------------------------------     class package trevstrings : public tstringgrid     {     private:     //  void __fastcall setwidth(int w);     //  int __fastcall getwidth(void);     //  int fcolcount ;       int frowcount;       int ffixedcols ;       int ffixedrows ;       int fdefaultcolwidth ;       int fdefaultrowheight ;       int fheight;     //  int fwidth;       int fscrollbars;       int fmaxlength;       bool colcolors[24];      protected:     public:         __fastcall trevstrings(tcomponent* owner);         void __fastcall drawcelltext(trect arect,int aleft,string s);        virtual void __fastcall drawcell(int acol, int arow,                               const windows::trect &arect, tgriddrawstate astate);        void __fastcall setcolor_col(int col,int row);        void __fastcall setcolorflag(int col,bool flag);        bool __fastcall getcolorflag(int col);        void __fastcall setedittext(int acol, int arow,                                                   const system::ansistring value);        void __fastcall clear(bool allorone,int position);       void __fastcall dblclick(void);     __published:     //  __property int colcount = {read = fcolcount};//fcolcount};       __property int rowcount = {read=frowcount};       __property int fixedcols = {read=ffixedcols};       __property int fixedrows = {read=ffixedrows};       __property int defaultcolwidth = {read=fdefaultcolwidth};       __property int defaultrowheight = {read=fdefaultrowheight};       __property int height = {read=fheight};     //  __property int width = {read=getwidth,write=setwidth};       __property int scrollbars = {read=fscrollbars};       __property int maxlength = {read=fmaxlength,write=fmaxlength};     /*     */          };     //---------------------------------------------------------------------------     #endif  

never heard of trevstrings before

• so either bcb 3 discontinued stuff (my bds2006 not have @ disposal)
• or have 3th party custom package installed
• but header file suggest based on string grid
• so if below text not work if can switch tstringgrid instead

in tstringgrid

• size properties accessible normaly:

  stringgrid1->height=256; stringgrid1->width=128; 

• if want have size-able col/rows not forget open options property

• and set gorowsizing,gocolsizing true
• and starting sizes defaultcolwidth,defaultrowheight

• here example of ussage

  // resize grid stringgrid1->height=128; stringgrid1->width=256; // access cell ansistings stringgrid1->cells[0][0]="(0,0)"; stringgrid1->cells[1][1]="(1,1)"; stringgrid1->cells[1][2]="(1,2)"; stringgrid1->cells[2][1]="(2,1)"; // resizing row/col stringgrid1->rowheights[0]=15; stringgrid1->rowheights[1]=20; stringgrid1->colwidths[0]=20; stringgrid1->colwidths[1]=15; 

as class derived should work if not there more possibilities:

1. you have unrelated bug somewhere

   • overwriting should not
   • damaging c++ engine app running on
   • or have memory leak somewhere
   • or memory manager invalidated see bds 2006 c hidden memory manager conflicts not case
   • or calling vcl/winapi visual stuff threads
   • to check this:
   • create empty application, add trevstring , try set height on runtime
   • if no error occurs have bug somewhere if error occurs then:

2. this component not able resize on runtime way

   • try use functions setsize,setbounds instead
   • or place component on panel align client , resize panel

3. if not swith standard tstringgrid

   • you can try cast revstring stringgrid first
   • ((tstringgrid*)(revstring1))->height=25;

4. borland compilers weird

   • few times (around 10) on years use bcb/bds
   • the compiler compile wrongly
   • the app running code gets distorted or discarted
   • what helps?
   • close ide or restart windows
   • delete map,obj,tds temp files prior compiling rebuilding
   • sometimes needed add empty line of code or swap 2 lines of code

5. identifiers/names collisions

   • if name stuff in similar way vcl functions ask problems
   • usual error name function draw() ... (use draw() instead , fine)

6. for big projects

   • if add source code new unit project instead of include (it present in object manager)
   • then in big projects got big problems
   • it looks units compiled differently normal included files
   • in units expected formulars , othe vcl stuff components
   • if got own non visual classes units stop working expected
   • creating weird behavior (even error caused it)
   • i observe on bcb5 , bds2006
   • in bcb3,bcb4 did not make big projects
   • and bcb6 buggy unusable big projects anyway
   • by big projects mean > 1 mb of pure c++ code