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Liblouis User's and Programmer's Manual

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7.4 Deprecation of the logging system

As of version 2.6.0 lou_logFile, lou_logPrint and lou_logEnd are deprecated. They are replaced by a more powerful, abstract API consisting of lou_registerLogCallback and lou_setLogLevel.

Usage of lou_logFile, lou_logPrint and lou_logEnd is discouraged as they may not be part of future releases. Applications using Liblouis should implement their own logging system.

During the transitional phase, lou_logPrint is registered as default callback in lou_registerLogCallback. lou_logPrint is overwritten by the first call to lou_registerLogCallback and reattached when NULL is set as callback. Note that calling lou_logPrint directly will not cause an invocation of the registered callback.