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The QCMDEXC api requires the command, and the length of the command you are sending it. Not sure why, considering it could've figured that out itself,
No, it can't figure it out itself. It can't view the source code of your program, it doesn't know how large your variables are.
Remember, parameters are passed as a pointer. That's all the program that's receiving the parameter gets, just a pointer, nothing else. How does it know how long the variable is?
There are two possible ways to solve that problem: a) You can pass it a length. (That's the solution that QCMDEXC uses)b) You can pass some sort of delimiter to indicate the end of the string. (that's what system() uses)
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