wave file editing please help me

[anju]

hi all, i have to insert some voice data in existing wave file for that 1.i opend the wave file by using mmioOpen in ReadWrite mode then 2.Read all the header to conform the wave file then 3.i tried to move the cursur position to particular portion in a wave file by using mmioSeek with SET_SEEK( it is failing ) then 4.i am getting the data by using wave functions then 5.i am using mmiowrite function to write the collected data in a particular portion of existing wave file can any one help me why the mmioseek function fails and is there good procedure to do this thanks in advance anju