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qt software about freeing the cache

Hello, I use DAQmxCfgSampClkTiming (taskHandle, "", 50000.0, DAQmx_Val_Rising DAQmx_Val_FiniteSamps, 800000).
Function to set the cache, reads and writes data to the cache
Call DAQmxReadAnalogF64 recirculation (taskHandle, 1, 1, DAQmx_Val_GroupByChannel, data, 10000, & read, NULL);

The function reads the contents of the cache, but the data is the same every time it is called, is there any way to free up the memory that has been read from the cache?

Thank you for your answer

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