首页 'NULL' was not declared in this scope

'NULL' was not declared in this scope

时间: 2023-10-21 16:04:16 浏览: 233

适用于Ubuntu 20.04的opencv-3.3.1资源

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适用于Ubuntu 20.04的opencv-3.3.1资源；经过我的修改，解决了error: ‘CODEC_FLAG_GLOBAL_HEADER’ was not declared in this scope、error: ‘AVFMT_RAWPICTURE’ was not declared in this scope、error: invalid conversion from ‘const char*’ to ‘char*’ [-fpermissive] 856 | char* str = PyString_AsString(obj);等错误。

This error message typically occurs when the compiler encounters the keyword 'NULL' in the code, but it doesn't recognize it as a valid identifier. This can happen when the necessary header file is not included or when the code is written in a language that doesn't support the 'NULL' keyword. To fix this error, try including the necessary header file(s) or replacing the 'NULL' keyword with an equivalent value that is recognized by the programming language you are using. For example, in C++, you can replace 'NULL' with 'nullptr' or '0'.

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