DAQmxWriteAnalogF64 clean up dynamically allocated data

[Chris_c++]

I want to use a dynamically allocated memory in a call to DAQmxWriteAnalogF64.

float64 *data = malloc( dataPoints );

...

...

The call works as expected but I am not able to free the memory without an error. Even after the task is stopped and cleared I cannot clean up the allocated memory. 

DAQmxStopTaks( taskHandle );

DAQmxClearTask( taskHandle );

if( data )

{

free(data);  // causes error

}

[Brad_K · Accepted solution]

Hi Chris_c++,

Can you show your code for filling in the data buffer and passing it to DAQmxWriteAnalogF64? If you write past the end of the buffer, the C runtime library's memory allocator may crash or terminate the application with a runtime error when you call free(). My guess is that you really need to allocate dataPoints * sizeof(float64) bytes, not dataPoints bytes.

Brad

[Chris_c++]

Hi Brad,

My mistake. You are correct. 

Thank you for the response!