ZeroMemory(&fos,sizeof(fos));

fos.wFunc = FO_COPY;
fos.pFrom = "C:\\D\\KK";
fos.pTo = "C:\\B";
fos.fFlags = FOF_NOCONFIRMATION | FOF_NOCONFIRMMKDIR | FOF_NOERRORUI | FOF_SILENT;

if (SHFileOperation(&fos)) MessageBox(NULL,"SHFileOperation failed","Error",MB_ICONERROR);
else MessageBox(NULL,"SHFileOperation OK","Info",MB_ICONINFORMATION);