TBBUTTONINFO mtbbi;
HWND hwnd;
HANDLE hProc;
DWORD dwProcessID;
void* lpData;

GetWindowThreadProcessId(hwnd, &dwProcessID);
hProc = OpenProcess(PROCESS_ALL_ACCESS, 0, dwProcessID);
lpData = VirtualAllocEx(hProc , 0, sizeof(TBBUTTONINFO), MEM_COMMIT, PAGE_READWRITE);
memset(&mtbbi,0,sizeof(mtbbi));
mtbbi.cbSize=sizeof(TBBUTTONINFO);
mtbbi.dwMask=TBIF_BYINDEX|TBIF_LPARAM;
WriteProcessMemory(hProc,lpData,&mtbbi,sizeof(TBBUTTONINFO),&dwBytesRead);
SendMessage(hwnd, TB_GETBUTTONINFO, 0, (LPARAM)lpData);
ReadProcessMemory(hProc, lpData, &mtbbi, sizeof(TBBUTTONINFO), &dwBytesRead);