I download Neoncube downloader and tried to compile. After I resolved some linking issues, there's still three that I can't solve.
1>main.obj : error LNK2019: unresolved
external symbol _UnEmbedBrowserObject
referenced in function "long stdcall
NoticeWindowProcedure(struct HWND
*,unsigned int,unsigned int,long)" (?NoticeWindowProcedure##YGJPAUHWND__##IIJ#Z)
1>main.obj : error LNK2019: unresolved
external symbol _EmbedBrowserObject
referenced in function "long stdcall
NoticeWindowProcedure(struct HWND
*,unsigned int,unsigned int,long)" (?NoticeWindowProcedure##YGJPAUHWND__##IIJ#Z)
1>main.obj : error LNK2019: unresolved
external symbol _DisplayHTMLPage
referenced in function "void cdecl
drawNotice(struct HWND *,int)"
(?drawNotice##YAXPAUHWND__##H#Z)
These functions appear to be from some obscure COM object from Microsoft. Yet I can't found any documentation on it. (UnEmbedBrowserObject, EmbedBrowserObject, DisplayHTMLPage)
Can someone help me?
Thanks
These are not names in any of the Microsoft SDK libraries. The appear to come from this code project. It could also be this one. You'll have to build it to create the DLL and add the .lib it produces to your project's linker input.
Related
There is an abandoned project, that builds correctly in 32bit version, but I need 64bit version of it. I tried to change project setting to x64 in visual studio, but when I click build I get lots of errors. Here are the visual studio files. And here is more info about the project. I have no experience with VS and c++.
This is a DLL, that makes connection between MT5 platform and MySQL, using libmysql.dll. I would like to read and write data to/from MySQL using MT5.
I would appreciate if you could help me to convert this to 64 bits, the 32 bit version can not be loaded to MT5.
Here are the first 5 error:
1>MQLMySQL.obj : error LNK2019: unresolved external symbol mysql_num_rows referenced in function "int __cdecl cMySqlCursorRows(int)" (?cMySqlCursorRows##YAHH#Z)
1>MQLMySQL.obj : error LNK2019: unresolved external symbol mysql_num_fields referenced in function "wchar_t * __cdecl cMySqlGetRowField(int,unsigned int)" (?cMySqlGetRowField##YAPEA_WHI#Z)
1>MQLMySQL.obj : error LNK2019: unresolved external symbol mysql_errno referenced in function "bool __cdecl MySqlExecute(int,wchar_t *)" (?MySqlExecute##YA_NHPEA_W#Z)
1>MQLMySQL.obj : error LNK2019: unresolved external symbol mysql_error referenced in function "bool __cdecl MySqlExecute(int,wchar_t *)" (?MySqlExecute##YA_NHPEA_W#Z)
1>MQLMySQL.obj : error LNK2019: unresolved external symbol mysql_init referenced in function "int __cdecl cMySqlConnect(wchar_t *,wchar_t *,wchar_t *,wchar_t *,int,wchar_t *,int)" (?cMySqlConnect##YAHPEA_W000H0H#Z)
1>MQLMySQL.obj : error LNK2019: unresolved external symbol mysql_real_connect referenced in function "int __cdecl cMySqlConnect(wchar_t *,wchar_t *,wchar_t *,wchar_t *,int,wchar_t *,int)" (?cMySqlConnect##YAHPEA_W000H0H#Z)
From the first 5 errors you've had, it looks like a linker issue. Most compiled languages compile the source (c++) code into object files and then link them with existing libraries. If the source compiles, but you can't link to the external libraries (for example they aren't installed) then you'll get errors like you've described.
Is there an external library that you need to reference, or are all of your source files organized in such a way that they can reference each other?
This question does not already have an answer
I know what an unresolved external symbol means - I'm asking specifically why when building as ARM the DirectX functions are missing for my project. When I build my DirectX project for Raspberry Pi I get the below link errors. Why is CoCreateInstFromApp missing only for the ARM build?
The Microsoft documentation on CoCreateInstanceFromApp implies it should simply be present in any Windows executable - this is in fact what I see when building x86 or x64 versions of the same project. It ought to be present, since DirectX does support ARM architecture - or have I missed something?
The project is including d3d11.lib & dxgi.lib, which I presumed it would pick up from the right directory - but get no specific errors about those libraries. The project is C++ in Visual Studio 2017 Pro v15.8.7.
Redacted link error:
DirectXTK_ARM.lib : error LNK2019: unresolved
external symbol __imp_CoCreateInstanceFromApp referenced in function
"long __cdecl CoCreateInstance ...
DirectXTK_ARM.lib : error LNK2019: unresolved
external symbol __imp_PropVariantClear ....
More info, if required:
I have altered this Desktop Duplication sample from Microsoft to do a screen-shot instead of duplication, and thus removed the window code and used DirectXTK for saving the file. This works great on my desktop and on a Minnowboard (x64 Win10 IoT). But if I try and compile for Raspberry PI (ARM) it fails with the link error:
DirectXTK_ARM.lib(WICTextureLoader.obj) : error LNK2019: unresolved
external symbol __imp_CoCreateInstanceFromApp referenced in function
"long __cdecl CoCreateInstance(struct _GUID const &,struct IUnknown
*,unsigned long,struct _GUID const &,void * *)" (?CoCreateInstance##YAJABU_GUID##PAUIUnknown##K0PAPAX#Z)
DirectXTK_ARM.lib(WICTextureLoader.obj) : error LNK2019: unresolved
external symbol __imp_PropVariantClear referenced in function "long
__cdecl `anonymous namespace'::CreateTextureFromWIC(struct ID3D11Device *,struct ID3D11DeviceContext *,struct
IWICBitmapFrameDecode *,unsigned int,enum D3D11_USAGE,unsigned
int,unsigned int,unsigned int,unsigned int,struct ID3D11Resource *
*,struct ID3D11ShaderResourceView * *)" (?CreateTextureFromWIC#?A0x2b71c33d##YAJPAUID3D11Device##PAUID3D11DeviceContext##PAUIWICBitmapFrameDecode##IW4D3D11_USAGE##IIIIPAPAUID3D11Resource##PAPAUID3D11ShaderResourceView###Z)
1
CoCreateInstance and PropVariantClear are part of ole32.lib.
UWP apps should link with the umbrella WindowsApp.lib, but you can also link to umbrella mincore.lib for IoT apps.
I am a newbie in C++ and getting the below error while compiling an old C++ application. On reading various posts here, my understanding is that the function call might be missing some parameters. Now, the function is a part of static library. How do I identify the missing parameters? Or is (enough) required information there in the error message below?
rfcclass.lib(crfcglob.obj) : error LNK2019: unresolved external symbol
"class std::basic_ostream > & __cdecl std::operator<<(class
std::basic_ostream > &,char const *)"
(??6std##YAAAV?$basic_ostream#DU?$char_traits#D#std###0#AAV10#PBD#Z)
referenced in function "public: __thiscall
CRfcTrace::~CRfcTrace(void)" (??1CRfcTrace##QAE#XZ)
Thanks.
all
I am very new to C++.
But I have used C# as my primary develop language.
Now I have an application written in MFC.
When I first built it, it gives me those error.
error LNK2001: unresolved external symbol "public: long __thiscall CWnd::SendMessageW(unsigned int,unsigned int,long)" (?SendMessageW#CWnd##QAEJIIJ#Z) DbeCok.lib
Could someone give me a clue to fix this?
EDIT
The original message is below
Error 5 error LNK2001: unresolved external symbol "int __stdcall AfxDeactivateActCtx(unsigned long,unsigned long)" (?AfxDeactivateActCtx##YGHKK#Z) C:\WebDev\SPC\DbeCok.lib(GridCellBase.obj)
Yesterday I got this linker error. I have searched on google and msdn without success.
My problem:
I have moved some parts of my cpp project in a extern static library. I added the h file to my main project and added the dependencies to the lib files. Unfortunately I get a lot linker errors.
1>Compressor.obj : error LNK2001: unresolved external symbol "public: bool __thiscall NWindows::NFile::NFind::CFileInfo::Find(unsigned short const *)" (?Find#CFileInfo#NFind#NFile#NWindows##QAE_NPBG#Z)
1>Compressor.obj : error LNK2001: unresolved external symbol "public: class NWindows::NCOM::CPropVariant & __thiscall NWindows::NCOM::CPropVariant::operator=(unsigned short const *)" (??4CPropVariant#NCOM#NWindows##QAEAAV012#PBG#Z)
1>Compressor.obj : error LNK2001: unresolved external symbol "public: bool __thiscall CInFileStream::Open(unsigned short const *)" (?Open#CInFileStream##QAE_NPBG#Z)
1>Compressor.obj : error LNK2001: unresolved external symbol "public: bool __thiscall NWindows::NFile::NIO::COutFile::Create(unsigned short const *,bool)" (?Create#COutFile#NIO#NFile#NWindows##QAE_NPBG_N#Z)
1>Compressor.obj : error LNK2001: unresolved external symbol "void __cdecl ConvertUInt32ToString(unsigned int,unsigned short *)" (?ConvertUInt32ToString##YAXIPAG#Z)
1>Compressor.obj : error LNK2001: unresolved external symbol "public: bool __thiscall NWindows::NDLL::CLibrary::Load(unsigned short const *)" (?Load#CLibrary#NDLL#NWindows##QAE_NPBG#Z)
All this methods a part of my extern lib. I have tries a lot of compiler settings without success.
Further more when I remove the lib dependencie completely from the linker I get 26 LNK2001 error. So the linker finds only "parts" of the lib.
Do I use a wrong compiler / linker option for my projects?
edit:
The problem was the parameter define LPCTSTR of the method CLibrary::Load(LPCTSTR fileName). In my lib I set the option "Treat wchar_t as build-in type (Properties->C/C++->Lanuage-> ... ) to No. And now it works.
There's not enough information in the question so my answer merely serves as a guide.
Take one function, for instance bool NWindows::NFile::NFind::CFileInfo::Find(unsigned short const *) and find definition of it in your code. Is it there? With this exact function signature? Is it in unnamed namespace? Is it declared static in source file?
Also, try full rebuild of everything. You'd be surprised how many times full rebuild makes mysterious problems go away.