c++ - Initilizer-list cannot convert to const MARGINS* -

today jumped visual studio (c++) 2013, using codeblocks lot of time realized codeblocks starts fail @ compiling codes this:

//#define _win32_winnt 0x0500 #include "hmain.h" #include <windows.h> #include <uxtheme.h>  int width = 800; int height = 600;  const margins* margin = { 0, 0, width , height };  char lwindowname[256] = "teeest"; hwnd hwnd;  char twindowname[256] = "teeest";  hwnd twnd; rect tsize;  msg message;  lresult callback winproc(hwnd hwnd, uint message, wparam wparam, lparam lparam) {     switch (message)     {         case wm_paint:             render ();             break;         case wm_create:             dwmextendframeintoclientarea(hwnd, margin);             break;         case wm_command:             if (wparam == vk_escape) postquitmessage(0);             break;         case wm_destroy:             postquitmessage(0);             return 0;         default:             return defwindowproc(hwnd, message, wparam, lparam);             break;     }     return 0; }  int winapi winmain(hinstance hinstance, hinstance hsecinstance, lpstr ncmdline, int ncmdshow) {      createthread(0, 0, (lpthread_start_routine)setwindowtotarget, 0, 0, 0);      wndclassex wclass;     wclass.cbclsextra = null;     wclass.cbsize = sizeof(wndclassex);     wclass.cbwndextra = null;     wclass.hbrbackground = (hbrush)createsolidbrush(rgb(0, 0, 0));     wclass.hcursor = loadcursor(0, idc_arrow);     wclass.hicon = loadicon(0, idi_application);     wclass.hiconsm = loadicon(0, idi_application);     wclass.hinstance = hinstance;     wclass.lpfnwndproc = winproc;     wclass.lpszclassname = (lpcwstr)lwindowname;     wclass.lpszmenuname = (lpcwstr)lwindowname;     wclass.style = cs_vredraw | cs_hredraw;      if(!registerclassex(&wclass))         exit(1);      twnd = findwindow(0, (lpcwstr)twindowname);     if (twnd)     {         getwindowrect(twnd, &tsize);         width = tsize.right - tsize.left;         height = tsize.bottom - tsize.top;         hwnd = createwindowex(ws_ex_topmost | ws_ex_transparent | ws_ex_layered, (lpcwstr)lwindowname, (lpcwstr)lwindowname, ws_popup, 1, 1, width, height, 0, 0, 0, 0);         setlayeredwindowattributes(hwnd, 0, 1.0f, lwa_alpha);         setlayeredwindowattributes(hwnd, 0, rgb(0, 0, 0), lwa_colorkey);         showwindow( hwnd, sw_show);     }      directxinit(hwnd);      (;;)     {         if (getasynckeystate(vk_escape)) break;         if(peekmessage(&message, hwnd, 0, 0, pm_remove))         {             dispatchmessage(&message);             translatemessage(&message);         }         sleep(1);     }     return 0; }  void setwindowtotarget() {     while(true)     {         twnd = findwindow(0, (lpcwstr)twindowname);         if (twnd)         {             getwindowrect(twnd, &tsize);             width = tsize.right - tsize.left;             height = tsize.bottom - tsize.top;             dword dwstyle = getwindowlong(twnd, gwl_style);             if(dwstyle & ws_border)             {                 tsize.top += 23;                 height -= 23;             }             movewindow(hwnd, tsize.left, tsize.top, width, height, true);         }         else         {             char* errormsg[125];             messagebox(0, l"mal", (lpcwstr)l"error - cannot find game!", mb_ok | mb_iconerror);             exit(1);         }         sleep(100);     } } 

so, 2 question. first, how fix compiler error: http://gyazo.com/6d7de9e0f3bad345dbbe7b9b80c90b8d , second question. realized must put "l" , (lpcwstr) before chars*, 100% required? there way avoid @ least (lpcwstr)? read.

first,

 const margins* margin = { 0, 0, width , height }; 

is invalid. want create new margins object , initialize given values, in case don't want margin pointer:

 const margins margin = { 0, 0, width , height }; 

second, dwmextendframeintoclientarea() expects const margins*, pointer margins object. give address of margin:

dwmextendframeintoclientarea(hwnd, &margin); 

as wide character issues, assuming compiling "unicode character set" in project options. in case, strings in windows api pointers wide characters (wchar_t*). however, allocating narrow character arrays (such lwindowname) , casting them pointer wchar_t:

wclass.lpszclassname = (lpcwstr)lwindowname; 

this give sorts of weird behaviours. make sure strings really made of wide characters:

wchar_t lwindowname[256] = l"teeest"; 

this allow drop casts.