c++ - Painted image is always black -

i'm trying draw image within popup windows. bitmap infos stream. part should ok, because if create file , save bitmap looks fine.

the byte array stored follows:

static byte*                            _bitampcontent; 

here how create window:

static wchar name[] = l"bitmap display";      hinstance _instance = ::getmodulehandle(null);     hwnd hwnd;     msg msg;     wndclass wndclass;     wndclass.style = 0;     wndclass.lpfnwndproc = class::_windowproc;     wndclass.cbclsextra = 0;     wndclass.cbwndextra = 0;     wndclass.hbrbackground = (hbrush)getstockobject(gray_brush);     wndclass.hicon = loadicon(null, idi_application);     wndclass.hcursor = loadcursor(null, idc_arrow);     wndclass.hinstance = _instance;     wndclass.lpszmenuname = null;     wndclass.lpszclassname = name;      if (registerclass(&wndclass) == 0)     {         messagebox(0, l"the window not registered", l"message", mb_ok);         return 0;     }     rect rc;     getwindowrect(hwndowner, &rc);     int xpos = (getsystemmetrics(sm_cxscreen) - rc.right) / 2;     int ypos = (getsystemmetrics(sm_cyscreen) - rc.bottom) / 2;     hwnd = createwindowex(ws_ex_topmost, name, name, ws_overlappedwindow, cw_usedefault, cw_usedefault, 200, 200, null, null, _instance, null);      if (hwnd == 0)     {         messagebox(0, l"hwnd = 0", l"message", mb_ok);         return 0;     }      showwindow(hwnd, sw_shownormal);     updatewindow(hwnd);      while (getmessage(&msg, null, 0, 0))     {         translatemessage(&msg);         dispatchmessage(&msg);     }     msg.wparam; 

and in wndproc function paint bitmap.

lresult callback class::_windowproc(hwnd hwnd, uint umsgid, wparam wparam, lparam lparam) {     hbitmap hbitmap;     bitmap bitmap;     hdc hdc, hmemdc;  switch (umsgid) { case wm_paint:      bitmapinfoheader bmpinfoheader;     bmpinfoheader = { 0 };     bmpinfoheader.bisize = sizeof(bitmapinfoheader);     bmpinfoheader.bibitcount = 24;     bmpinfoheader.biclrimportant = 0;     bmpinfoheader.biclrused = 0;     bmpinfoheader.bicompression = bi_rgb;     bmpinfoheader.biheight = 200;     bmpinfoheader.biwidth = 200;     bmpinfoheader.biplanes = 1;     unsigned long pixel_data_size;     pixel_data_size = 200 * ((200 * (24 / 8)));     bmpinfoheader.bisizeimage = pixel_data_size;      bitmapinfo dbmi;     zeromemory(&dbmi, sizeof(dbmi));     dbmi.bmiheader = bmpinfoheader;     dbmi.bmicolors->rgbblue = 0;     dbmi.bmicolors->rgbgreen = 0;     dbmi.bmicolors->rgbred = 0;     dbmi.bmicolors->rgbreserved = 0;     void* bits;     bits = null;      hbitmap = createdibsection(null, &dbmi, dib_rgb_colors, &bits, null, 0);     if (hbitmap == null) {         messagebox(null, l"bitmap not loaded", l"error", mb_ok);         return 0;     }     gdiflush();     // copy pixels dib.     memcpy(bits, _bitampcontent, sizeof(_bitampcontent));      getobject(hbitmap, sizeof(bitmap), &bitmap);     paintstruct paintstruct;     hdc = beginpaint(hwnd, &paintstruct);     hmemdc = createcompatibledc(hdc);     selectobject(hmemdc, hbitmap);     bitblt(hdc, 0, 0, bitmap.bmwidth, bitmap.bmheight, hmemdc, 0, 0, srccopy);      deleteobject(hbitmap);     endpaint(hwnd, &paintstruct);     return 0; 

my problem now, painted image black. assume behavior has dc's don't know what.

what need change?