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The following example opens a file named SAMPLE.TXT for unbuffered I/O, and then enables buffered I/O with an internal 16K buffer using the mmioSetBuffer function.
HMMIO hFile; if ((hFile = mmioOpen("SAMPLE.TXT", NULL, MMIO_READ)) != NULL) { // File opened successfully; request an I/O buffer. if (mmioSetBuffer(hFile, NULL, 16384L, 0)) // Buffer cannot be allocated. else // Buffer allocated successfully. } else // File cannot be opened.