Error 3 Error C2491 Definition Of Dllimport Function Not Allowed
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C++ Error C2491
C2419 Compiler Error C2420 Compiler Error C2421 Compiler Error C2422 Compiler Error C2423 Compiler Error C2424 Compiler Error C2425 Compiler Error C2426 Compiler Error C2427 Compiler Error C2428 Compiler Error C2430 Compiler Error C2431 Compiler Error C2432 Compiler Error C2433 Compiler Error C2434 Compiler Error C2435 Compiler Error C2436 Compiler Error C2437 Compiler Error C2438 Compiler Error C2439 Compiler Error C2440 Compiler Error C2441 Compiler Error C2443 Compiler Error C2444 Compiler Error C2446 Compiler Error C2447 Compiler Error C2448 Compiler Error C2449 Compiler Error C2450 Compiler Error C2451 Compiler Error C2452 Compiler Error C2457 Compiler Error C2458 Compiler Error C2459 Compiler Error C2460 Compiler Error C2461 Compiler Error C2462 Compiler Error C2464 Compiler Error C2465 Compiler Error C2466 Compiler Error C2467 Compiler Error C2469 Compiler Error C2470 Compiler Error C2471 Compiler Error C2472 Compiler Error C2473 Compiler Error C2474 Compiler Error C2477 Compiler Error C2479 Compiler Error C2480 Compiler Error C2482 Compiler Error C2483 Compiler Error C2485 Compiler Error C2486 Compiler Error C2487
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this site About Us Learn more about Stack Overflow the company Business Learn cannot define dllimport entity c++ more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question psycopg config h 150 error c2491 round definition of dllimport function not allowed x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up definition https://msdn.microsoft.com/en-us/library/62688esh.aspx of dllimport function not allowed up vote 3 down vote favorite While compiling a C code, I'm getting the following error: c:\users\kbarman\documents\mser\vlfeat-0.9.13-try\mser\stringop.c(71): error C2491: 'vl_string_parse_protocol' : definition of dllimport function not allowed In the file stringop.c, I have the following function: VL_EXPORT char * vl_string_parse_protocol (char const *string, int *protocol) { char const * cpt ; int dummy ; /* handle the case http://stackoverflow.com/questions/7657552/definition-of-dllimport-function-not-allowed prot = 0 */ if (protocol == 0) protocol = &dummy ; /* look for :// */ cpt = strstr(string, "://") ; if (cpt == 0) { *protocol = VL_PROT_NONE ; cpt = string ; } else { if (strncmp(string, "ascii", cpt - string) == 0) { *protocol = VL_PROT_ASCII ; } else if (strncmp(string, "bin", cpt - string) == 0) { *protocol = VL_PROT_BINARY ; } else { *protocol = VL_PROT_UNKNOWN ; } cpt += 3 ; } return (char*) cpt ; } And VL_EXPORT is defined as follows: # define VL_EXPORT extern "C" __declspec(dllimport) Can somebody please tell me what is causing this error and how I can get rid of it? c dllimport share|improve this question asked Oct 5 '11 at 6:37 user979791 16112 Look up from that #define, there's a #ifdef that selects between dllexport and dllimport. You need dllexport here so define that macro. –Hans Passant Oct 5 '11 at 8:38 add a comment| 2 Answers 2 active oldest votes up vote 3 down vote As documentation states, dllimport function are not allowed to have a body right there. [...] functions c
here for a quick overview of the site Help Center Detailed answers to any questions you might have http://stackoverflow.com/questions/17573736/error-c2491-function-declared-in-header-and-defined-in-c Meta Discuss the workings and policies of this site About Us http://stackoverflow.com/questions/3491990/c-definition-of-dllimport-static-data-member Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, definition of just like you, helping each other. Join them; it only takes a minute: Sign up Error C2491: Function declared in header and defined in C++ up vote 1 down vote favorite I have been trying to build a device adapter for a open-source software called Micro-manager to control a microscope and there are some problems that definition of dllimport I am facing, there are these two files (one header and the other CPP) that are already present in the open source package of Micro-Manager. //MoudluleInterface.h #ifndef _MODULE_INTERFACE_H_ #define _MODULE_INTERFACE_H_ #ifdef WIN32 #ifdef MODULE_EXPORTS #define MODULE_API __declspec(dllexport) #else #define MODULE_API __declspec(dllimport) #endif #else #define MODULE_API #endif #define MM_MODULE_ERR_OK 1000 #define MM_MODULE_ERR_WRONG_INDEX 1001 #define MM_MODULE_ERR_BUFFER_TOO_SMALL 1002 /////////////////////////////////////////////////////////////////////////////// // header version // NOTE: If any of the exported module API calls changes, the interface version // must be incremented // new version 5 supports device discoverability #define MODULE_INTERFACE_VERSION 7 #ifdef WIN32 const char* const LIB_NAME_PREFIX = "mmgr_dal_"; #else const char* const LIB_NAME_PREFIX = "libmmgr_dal_"; #endif #include "MMDevice.h" /////////////////////////////////////////////////////////////////////////////// // Exported module interface /////////////////////////////////////////////////////////////////////////////// extern "C" { MODULE_API MM::Device* CreateDevice(const char* name); MODULE_API void DeleteDevice(MM::Device* pDevice); MODULE_API long GetModuleVersion(); MODULE_API long GetDeviceInterfaceVersion(); MODULE_API unsigned GetNumberOfDevices(); MODULE_API bool GetDeviceName(unsigned deviceIndex, char* name, unsigned bufferLength); MODULE_API bool GetDeviceDescription(const char* deviceName, char* name, unsigned bufferLength); And here is a part of the CPP file which defines these functions //ModuleInterface.cpp #define _CRT_SECURE_NO_DEPRECATE #i
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up C++ definition of dllimport static data member up vote 14 down vote favorite 4 I do have a class which looks like below: //.h file class __declspec(dllimport) MyClass { public: //stuff private: static int myInt; }; // .cpp file int MyClass::myInt = 0; I get the following compile error: error C2491: 'MyClass::myInt' : definition of dllimport static data member not allowed what should I do? c++ dll static static-members share|improve this question asked Aug 16 '10 at 9:34 MBZ 5,6351867133 add a comment| 3 Answers 3 active oldest votes up vote 19 down vote accepted __declspec(dllimport) means that the current code is using the DLL that implements your class. The member functions and static data members are thus defined in the DLL, and defining them again in your program is an error. If you are trying to write the code for the DLL that implements this class (and thus defines the member functions and static data members) then you need to mark the class __declspec(dllexport) instead. It is common to use a macro for this. When building your DLL you define a macro BUILDING_MYDLL or similar. In your header for MyClass you then have: #ifdef BUILDING_MYDLL #define MYCLASS_DECLSPEC __declspec(dllexport) #else #define MYCLASS_DECLSPEC __declspec(dllimport) #endif class MYCLASS_DECLSPEC MyClass { ... }; This means that you can share the header between the DLL and the application that uses the DLL. share|improve this answer answered Aug 16 '10 at 9:58 Anthony Williams 40.7k586126 Here is the corresponding cite on Microsoft's page: "Using __declspec(dllimport) is optional on function declarations [...]. However, you must use __declspec(dllimport) for the importing executable to access the DLL's public data symbols and objects. Note that the users of your DLL still need to link with an import library." –Jonny Dee Oct 9 '14 at 11:04 add a comment| up vote 2 down vote From MSDN Documentation, When you declare a class dllimport, all its member