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Creating and Deleting a File

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[The feature associated with this page, Multimedia File I/O, is a legacy feature. It has been superseded by Source Reader. Source Reader has been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use Source Reader instead of Multimedia File I/O, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

To create a file, set the dwOpenFlags parameter of the mmioOpen function to MMIO_CREATE. The following example creates a file and opens it for reading and writing.

HMMIO hFile; 

hFile = mmioOpen("NEWFILE.TXT", NULL, MMIO_CREATE | MMIO_READWRITE); 
if (hFile != NULL) 
    // File created successfully. 
else 
    // File cannot be created.

If the file you are creating already exists, it will be truncated to zero length.

To delete a file, set the dwOpenFlags parameter of the mmioOpen function to MMIO_DELETE. After you delete a file, it cannot be recovered by any standard means. If your application is deleting a file at the request of a user, query the user before deleting the file to make sure the user wants to delete it.