Create TMS file in VC++

hi,every one!

I am researching that how to create the tdms(tdm)file in vc 2010 , I added the TDM C DLL in my project and 

make a sample program referenced of the writefile.c ,but I have some problems as followed:

1. to create a TDM file ,the  code is 

    DDCFileHandle file;

    int ret = DDC_CreateFile ("C:\\1.tdm", "TDM", "", "", "", "", &file);

    with this two lines, the 1.tdm file was displayed in the C: , but the file was not created successed,

    because the "ret"  value  is -6211( DDC_StorageCouldNotBeOpened), which was defined in nilibddc.h.

2. if I want to create a TDMS file ,the  code is 

    DDCFileHandle file;

    int ret = DDC_CreateFile ("C:\\1.tdms", "TDMS", "", "", "", "", &file);

    But the tdms file was not displayed in C:

    what cause these two problems,please help me ! thank u!