c++ - How do I get a multi line tooltip in MFC -

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right now, have tool tip pops when hover on edit box. problem tool tip contains multiple error messages , in 1 long line. need have each error message on own line. error messages contained in cstring new line seperating them.

my existing code below.

bool ontooltiptext(uint, nmhdr* pnmhdr, lresult* presult) {     assert(pnmhdr->code == ttn_needtexta || pnmhdr->code == ttn_needtextw);     // need handle both ansi , unicode versions of message     tooltiptexta* pttta = (tooltiptexta*)pnmhdr;     tooltiptextw* ptttw = (tooltiptextw*)pnmhdr;     //    tchar szfulltext[256];     cstring strtiptext=_t("");     uint nid = pnmhdr->idfrom;     if (pnmhdr->code == ttn_needtexta && (pttta->uflags & ttf_idishwnd) ||         pnmhdr->code == ttn_needtextw && (ptttw->uflags & ttf_idishwnd))     {         // idfrom hwnd of tool         nid = ::getdlgctrlid((hwnd)nid);     }      //m_errprojaccel[ch] contains 1 or more error messages each seperated new line.     if((int)nid >= id_projected_accel1 && (int)nid < id_projected_accel1 + projected_rows -1 ) {         int ch = nid - id_projected_accel1;         strtiptext = m_errprojaccel[ch];     }    #ifndef _unicode     if (pnmhdr->code == ttn_needtexta)         lstrcpyn(pttta->sztext, strtiptext, sizeof(pttta->sztext)/sizeof(pttta->sztext[0]));     else         _mbstowcsz(ptttw->sztext, strtiptext, sizeof(pttta->sztext)/sizeof(pttta->sztext[0])); #else     if (pnmhdr->code == ttn_needtexta)         _wcstombsz(pttta->sztext, strtiptext, sizeof(pttta->sztext)/sizeof(pttta->sztext[0]));     else         lstrcpyn(ptttw->sztext, strtiptext, sizeof(pttta->sztext)/sizeof(pttta->sztext[0])); #endif     *presult = 0;      // bring tooltip window above other popup windows     ::setwindowpos(pnmhdr->hwndfrom, hwnd_top, 0, 0, 0, 0,         swp_noactivate|swp_nosize|swp_nomove|swp_noownerzorder);      return true;    // message handled }

creating multiline tooltips explained here in msdn library - read "implementing multiline tooltips" section. should send ttm_setmaxtipwidth message tooltip control in response ttn_getdispinfo notification force use multiple lines. in string should separate lines \r\n.

also, if text more 80 characters, should use lpsztext member of nmttdispinfo structure instead of copying sztext array.


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