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DIG_Change_Message_Config with PCI-6527 Card Doesn't Work with Visual C++

Primary Software: Driver Software>>NI-DAQ
Primary Software Version: 6.9.1
Primary Software Fixed Version: N/A
Secondary Software:

Problem: DIG_Change_Message_Config does not work in the Visual C++ programming enviroment with the PCI-6527. When I try to use this function, it gives me an application error. Why does this happen, and how can I avoid this error?

Solution: The problem is caused by the channel string parameters in the DIG_Change_Message_Config. During the parsing of these strings, NIDAQ will try to modify them, so if a string is stored in read-only memory, this operation will result in the memory write exception. Depending on the compiler and Operating System, a constant string may be stored in read-only memory as it is the case with Visual C++. To correct this problem, just allocate an array of type Char for the two strings parameters as follows:

char riseStr[4] = {"0.0");
char fallStr[4] = {"0.1");

DIG_Change_Message_Config(devNum,1,riseStr,fallStr,0,0,0);

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Report Date: 09/25/2001
Last Updated: 12/28/2001
Document ID: 2DOA7VN5

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