{"id":2340,"date":"2019-03-07T17:26:23","date_gmt":"2019-03-07T16:26:23","guid":{"rendered":"https:\/\/ridgesolutions.ie\/?p=2340"},"modified":"2019-03-07T18:58:17","modified_gmt":"2019-03-07T17:58:17","slug":"visual-studio-paho-mqtt-error-c2238unexpected-tokens-preceding","status":"publish","type":"post","link":"https:\/\/www.ridgesolutions.ie\/index.php\/2019\/03\/07\/visual-studio-paho-mqtt-error-c2238unexpected-tokens-preceding\/","title":{"rendered":"Visual Studio Paho MQTT Error C2238\tunexpected token(s) preceding ‘;’"},"content":{"rendered":"

If you’re receiving errors like the following when trying to build a project in Visual Studio 2017 using the Paho C client:<\/p>\n

\r\nError C2238 unexpected token(s) preceding ';'\r\n<\/pre>\n
Then there is a quick fix, the problem seems to revolve around the following for DLLImport & DLLExport in the Paho header files:<\/p>\n
\r\n#if defined(WIN32) || defined(WIN64)\r\n  #define DLLImport __declspec(dllimport)\r\n  #define DLLExport __declspec(dllexport)\r\n#else\r\n  #define DLLImport extern\r\n  #define DLLExport __attribute__ ((visibility (\"default\")))\r\n#endif\r\n<\/pre>\n
The catch here is that neither WIN32 nor WIN64 will be defined as instead either _WIN32 or _WIN64 will be defined.<\/p>\n
So a quick fix is to define either WIN32 or WIN64 in your project’s ‘Preprocessor Definitions’ depending on whether you are targeting x86 (32bit) or x64 (64bit).<\/p>\n
\"\"<\/a><\/p>\n
Here are some of the other errors you might see when you have this problem:<\/p>\n
\r\nerror C3861: 'visibility': identifier not found\r\nerror C4430: missing type specifier - int assumed. Note: C++ does not support default-int\r\nerror C2059: syntax error: 'const'\r\nerror C3861: 'visibility': identifier not found\r\nerror C4430: missing type specifier - int assumed. Note: C++ does not support default-int\r\nerror C2374: '__attribute__': redefinition; multiple initialization\r\nnote: see declaration of '__attribute__'\r\nerror C2448: '__attribute__': function-style initializer appears to be a function definition\r\n error C3646: 'data': unknown override specifier\r\n error C4430: missing type specifier - int assumed. Note: C++ does not support default-int\r\n error C3646: 'value': unknown override specifier\r\n error C4430: missing type specifier - int assumed. Note: C++ does not support default-int\r\n error C2143: syntax error: missing ';' before '*'\r\n error C4430: missing type specifier - int assumed. Note: C++ does not support default-int\r\n error C2238: unexpected token(s) preceding ';'\r\n error C3861: 'visibility': identifier not found\r\n error C4430: missing type specifier - int assumed. Note: C++ does not support default-int\r\n error C2374: '__attribute__': redefinition; multiple initialization\r\nnote: see declaration of '__attribute__'\r\n error C2448: '__attribute__': function-style initializer appears to be a function definition\r\n error C2143: syntax error: missing ',' before '*'\r\n error C3861: 'visibility': identifier not found\r\n error C4430: missing type specifier - int assumed. Note: C++ does not support default-int\r\n\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"
If you’re receiving errors like the following when trying to build a project in Visual Studio 2017 using the Paho C client: Error C2238 unexpected token(s) preceding ‘;’ Then there is a quick fix, the problem seems to revolve around the following for DLLImport & DLLExport in the Paho header files: #if defined(WIN32) || defined(WIN64) […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2340","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t