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Use ByVal When API Calls Cause Problems

Use ByVal When API Calls Cause Problems

If an API call is not achieving the desired or expected effects, tryplacing ByVal in front of parameters. Likely ones to cause trouble arestrings and anything declared “As Any.” The APIs that trip peopleup the most are the various INI file calls, SendMessage, and HMemCpy. Bevery suspicious any time a parameter is declared As Any rather than asan explicit type, or if a string isn’t declared ByVal.

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