Error C2664 Callback
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Error C2664 Lpcwstr
member function to a function signature up vote 4 down vote favorite I'm using a 3rd party library that allows me to register callbacks for certain events. The register function looks something like this. It uses the Callback signature. typedef int (*Callback)(std::string); void registerCallback(Callback pCallback) { //it gets registered } My problem is that I want to register a member function as a callback something like error c2664 cannot convert argument this struct MyStruct { MyStruct(); int myCallback(std::string str); }; MyStruct::MyStruct() { registerCallback(&MyStruct::myCallback); } int MyStruct::myCallback(std::string str) { return 0; } Of course, the compiler complains, saying error C2664: 'registerCallback' : cannot convert parameter 1 from 'int (__thiscall MyStruct::* )(std::string)' to 'Callback' I've been looking at boost libraries like function and bind, but none of those seem to be able to do the trick. I've been searching all over Google for the answer, but I don't even know what to call this, so it hasn't been much help. Thanks in advance. c++ function boost bind signature share|improve this question asked Nov 8 '11 at 2:37 Jonathan Ross 2114 Thanks everyone! 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. link. Unless someone has some really crazy TMP tricks? –Jonathan Ross Nov 8 '11 at 6:20 add a comment| 6 Answers 6 active oldest votes up vote 6 down vote You're trying to pass a member function pointer as a normal function pointer which won't work. Member functions have to have the this pointer as one of
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C++ Function Pointer
member function pointer P: 9 ifitzgerald I am attempting to use a wrapper class to the Win32 timer API in a Visual C++ 6.0 MFC application. The callback function needs to have access to the front panel, and as such needs to be a http://stackoverflow.com/questions/8045322/c-function-callbacks-cannot-convert-from-a-member-function-to-a-function-sign member of the front panel class. I kept getting compile error C2276 when I tried passing the address of a member function. After implementing a few changes suggested by the author of the class, I now get the following error when compiling: error C2664: 'setCallbackFunction' : cannot convert parameter 1 from 'void (__stdcall CTestDlg::*)(int)' to https://bytes.com/topic/c/answers/705463-c2664-passing-member-function-pointer 'void (__cdecl *)(int)' There is no context in which this conversion is possible The line that causes the error is: Expand|Select|Wrap|Line Numbers timer1.setCallbackFunction(&CTestDlg::timer1Event); The prototype of the callback function looks like this: Expand|Select|Wrap|Line Numbers voidCALLBACKCTestDlg::timer1Event(inti) The prototype of the setCallbackFunction function looks like this: Expand|Select|Wrap|Line Numbers VOIDLRTimer::setCallbackFunction(VOID(*_pCallback)(int)){ m_pCallback=_pCallback; } Do you have any ideas as to how I might fix this? I would greatly appreciate it if I could get a fix within the next 48 hours - this is a rather important part of a project I'm working on. I tried contacting the author of the class, but it looks like he hasn't been active for a while. Thank you! Ian Sep 9 '07 #1 Post Reply Share this Question 3 Replies Expert Mod 5K+ P: 8,916 Banfa Expand|Select|Wrap|Line Numbers VOIDLRTimer::setCallbackFunction(VOID(*_pCallback)(int)){ m_pCallback=_pCallback; } This function takes a pointer to a function, not a pointer to a function member of an object. That is internally setCallbackFunction (and LRTIMER) has no knowledge o
SecureBlackbox Secure storage of files and documents Solid File System Virtualization of drives, folders, files Callback File System (CBFS) CallbackDisk CallbackFilter Control over file system operations Callback File https://www.eldos.com/forum/read.php?FID=14&TID=3243 System (CBFS) CallbackFilter Control over registry operations CallbackRegistry Direct access to disks RawDisk Synchronization framework Rethync SDK Secure heterogenous messaging MsgConnect For business integrators Secure protocols for transfer and keeping of http://www.gamedev.net/topic/116880-callback-problems/ binary data, files, documents and e-mails BizCrypto for MS SQL Server BizCrypto for MS BizTalk Server Virtual drive representing remote contents of any SFTP server SFTP Net Drive Product list SecureBlackbox error c2664 Security of data, files, documents and e-mails during transfer and in storages BizCrypto Security of business automation processes Solid File System Secure file and document storage Callback File System (CBFS) Virtualization of drives, folders, files CallbackDisk Virtual disk based on disk image CallbackFilter Control over file system access CallbackProcess Monitoring of process and threads creation and termination CallbackRegistry Control over registry access RawDisk error c2664 cannot Direct access to disks Rethync SDK Synchronization framework MsgConnect Secure heterogenous messaging SFTP Net Drive Mount remote SFTP storages as local drives Support options My Control Center Knowledgebase Documentation on-line Helpdesk Forum Live chat About us Corporate information Company news Testimonials Valuable clients Partner program Contact us Home / Forums / Forum «CallbackFilter» - EldoS Topics 1 - 10 of 356 First|Prev.|1 2345|Next|Last Topics: 356 Topic Title Topic Starter Replies Last Post Info Pinned: Tell us what you need (Pages: 1 2 ) by Eugene Mayevski (EldoS Corp.) 11 04/07/2015 05:23:27Author: edius user Help！If you can call it in my own driver？ by Peter Wang (Basic support level) 3 09/24/2016 12:21:15Author: Eugene Mayevski CreatefileC function(Directory/file) by Jayashree Subramanian (Standard support level) 1 09/20/2016 04:16:36Author: Vladimir Cherniga Trying to expose virtual file by Michael Donkhin (Basic support level) 1 09/06/2016 06:05:29Author: Vladimir Cherniga Reparse identification by Or Ami (Basic support level) 1 08/31/2016 04:31:37Author: Vladimir Cherniga Any dependancies of CallbackFilter's .Net library? by Dennis (Premium support level) 3 08/16/2016 16:53:16Author: Eugene Mayevski Directory enumeration order by Or Ami (Basic support level
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