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Error C2664 Callback


share|improve this answer answered Feb 15 '14 at 13:21 0x499602D2 57.2k1990164 add a comment| up vote 0 down vote If your program were written in C then the code would be I know this way with SetWindowLong does not work WM_CREATE message. The cast should also include __stdcall: (GLvoid (__stdcall *) ()).3) you sure you want glColor after glVertex? In a more modern toolkit, we could have associated our action with a variety of different events (like button push, button release, …). Check This Out

Member functions have to have the this pointer as one of the hidden parameters, which isn't the case for normal functions, so their types are incompatible. The specific task I'm trying to do is register a JavaScript callback function like this ObjectTemplate::New()->Set(String::New("getRemote"), FunctionTemplate::New(&RemoteObject::getRemoteCallback)); And FunctionTemplate::New takes an InvokationCallback that looks like this typedef Handle (*InvocationCallback)(const Arguments& args); In this case though, it won't be able to access the class members though, since it is not a member function. I found one other post that asks the same question, and it looks like the consensus is just to make the member function a normal function or make it static. http://stackoverflow.com/questions/8045322/c-function-callbacks-cannot-convert-from-a-member-function-to-a-function-sign

Error C2664 Cannot Convert Parameter

I'm aware this code doesn't loop at all which it will eventually need to be. It uses the Callback signature. You cannot reply to this topic 5 replies to this topic #1 eldee Members -Reputation: 122 Like Likes Like Posted 30 September 2002 - 10:01 AM C:\CPP\LineTest\CTess.cpp(41) : error C2664: In C++ we can inherit them.' [edited by - eldee on September 30, 2002 8:38:35 PM] Back to top #2 Alpheus Crossbones+ -Reputation: 6644 Like Likes Like Posted 30 September

I kept getting compile error C2276 when I tried passing the address of a member function. You may want to consider why you're trying to pass it the address of a member function, and if your design or use of the library could change. The main one is: typedef void(Fl_Callback )(Fl_Widget *, void *) What this tells us (in C++ crypticness) is that a callback is a function (that’s why its in parenthesis, and has Error C2664 Cannot Convert Argument Just calling SetTimer() within your class calls CWnd::SetTimer() (since your class is derived from CWnd), which takes 3 arguments. ::SetTimer() calls the Windows SDK function, which takes 4 arguments.

most of the other functions (but not all) are declared with a leading "afx_msg". Error C2664 Cannot Convert Parameter 1 From i've never messed with callback functions until today, so forgive my stupidity.. http://curl.haxx.se/libcurl/c/ftpupload.html The error is in this bit of code. https://bytes.com/topic/c/answers/705463-c2664-passing-member-function-pointer That is internally setCallbackFunction (and LRTIMER) has no knowledge of the any object containing the callback function and does not perform any of the pointer manipulation (creating and passing this) that

more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed Error C2664 Cannot Convert Parameter From Const Char To Lpcwstr Right now I would settle for one instance of the event. :confused: Faq Reply With Quote March 16th, 2005,07:28 PM #2 Scorpions4ever View Profile View Forum Posts  Banned ;) Devshed It needs to be outside the class as a standalone function. We know that the only time this function will be called is by the button we made.

Error C2664 Cannot Convert Parameter 1 From

Because FlTk doesn’t know the type that we’ll want to use, it makes us convert it to a generic pointer (void*). https://www.opengl.org/discussion_boards/showthread.php/143389-The-problem-of-callback-function-gluTessCallback Smash amps. Error C2664 Cannot Convert Parameter share|improve this answer edited Nov 8 '11 at 3:02 answered Nov 8 '11 at 2:57 Joe McGrath 1,004623 The reason I want to register a member function is so Error C2664 In C++ I can't use boost::bind because I get a similar error.

Thank you! :) Faq Reply With Quote Share This Thread  Tweet This + 1 this Post To Linkedin Subscribe to this Thread  Subscribe to This Thread « Previous Thread his comment is here Can a class instance variable be excluded from a subclass in Java? What does that even mean? Thanks P.S. Error C2664 Lpcwstr

If you do not have access to both classes, particularly access to the LRTimer class then: Firstly make the callback a static member of CTestDlg, if possible make it private. The need for the Gram–Schmidt process An experiment is repeated, and the first success occurs on the 8th attempt. If your design allows, then make MyStruct::myCallback() a static member method and the code should work fine. http://oncarecrm.com/error-c2664/error-c2664-in-c.html I also wouldn't hire a marketing firm to build my website." - Nilpo Faq Reply With Quote March 17th, 2005,12:35 PM #5 No Profile Picture dmittner View Profile View Forum

IntelliSense: argument of type "void *" is incompatible with parameter of type "FILE *" and Error C2664: 'fread' : cannot convert parameter 4 from 'void *' to 'FILE *' Any tips C++ Function Pointer The generic widget has no value – only buttons do. Edit: Seems std::mem_fun has been deprecated in the latest C++11 standard.

Code: Header file declaration: void CALLBACK EXPORT CountdownPoint(HWND,UINT,UINT_PTR,DWORD); InitializationFunction { SetTimer(1, 1000, CountdownPoint); } void CALLBACK EXPORT CountdownPoint(HWND hWnd,UINT nMsg,UINT nIDEvent,DWORD dwTime) { m_countdown.StepIt(); } I get this error when compiling:

When calling SetTimer(), pass NULL as the third parameter. Thanks for all your help so far. Back to top #3 Jan Wassenberg Members -Reputation: 999 Like Likes Like Posted 30 September 2002 - 10:10 AM Those specify calling convention (params pushed from right to left or May be the data passed would be enough for you t identify the object required and then call a normal method on the object from the class member function.

I intentionally left that out of it originally since I know many would focus only on that and I wanted to make sure the core syntax was correct first. Also, should it have anything to do with this... Not the answer you're looking for? navigate here Smash amps.

But in FlTk, the callback is passed the widget that caused the callback to happen (in this case the button). asked 2 years ago viewed 788 times active 2 years ago Get the weekly newsletter! Physically locating the server Heathrow to Gatwick and traffic jam more hot questions question feed lang-cpp about us tour help blog chat data legal privacy policy work here advertising info mobile Register Lost Password?

That is internally setCallbackFunction (and LRTIMER) has no knowledge of the any object containing the callback function and does not perform any of the pointer manipulation (creating and passing this) that So you need explicitly specify the type to what you want to convert an object of type void * You can use either C style casting or C++ style casting. Is it permitted to not take Ph.D. The data area pointed at by the pointer ptr may be filled with at most size multiplied with nmemb number of bytes.

Expand|Select|Wrap|Line Numbers voidCALLBACKCTestDlg::timer1Event(inti) This function is a member of CTestDlg and before calling requires that this is created and passed to timer1Event. When C++ code calls a method on an object, is passes a hidden argument that is the pointer to the object (this).