I'm programming with vc6.0 with my backup program. I included shlwapi.h, windows.h and I used PathStripPath function and PathRemoveFileSpec function.
When I complied this message came out.
BlackDlg.obj : error LNK2001: unresolved external symbol __imp__PathStripPathA#4
BlackDlg.obj : error LNK2001: unresolved external symbol __imp__PathRemoveFileSpecA#4
And I remove usage in my code and this message doesn't come. Thank for you quick advance.
The MSDN Library has plenty of information about both of these functions. If you look towards the ends of the articles you'll see that the functions are defined in shlwapi.lib; you need to instruct your linker to include this library for your project to build.
Related
I am trying to compile Live555 test programs in Visual Studio 2010, but I wasn't able to do so.
I compiled the libraries without any problems
BasicUsageEnvironment.lib
groupsock.lib
liveMedia.lib
UsageEnvironment.lib
but when it comes to the test programs, I just couldn't get anywhere. Here is the compiler message when I compile files in the mediaServer.
Has anyone encountered this problem before?
error LNK2001: unresolved external symbol "void __cdecl operator delete(void *)" (??3#YAXPAX#Z)
error LNK2001: unresolved external symbol "void * __cdecl operator new(unsigned int)" (??2#YAPAXI#Z)
error LNK2001: unresolved external symbol ___security_cookie
error LNK2001: unresolved external symbol ___CxxFrameHandler3
error LNK2001: unresolved external symbol #__security_check_cookie#4
error LNK2001: unresolved external symbol __RTC_CheckEsp
error LNK2001: unresolved external symbol __RTC_Shutdown
error LNK2001: unresolved external symbol __RTC_Shutdown
error LNK2001: unresolved external symbol __RTC_InitBase
error LNK2001: unresolved external symbol "const type_info::`vftable'" (??_7type_info##6B#)
error LNK2001: unresolved external symbol "public: virtual bool __thiscall Medium::isSource(void)const " (?isSource#Medium##UBE_NXZ)
<more errors>
Complete dump here: http://pastebin.com/4bVQAcdp
Update
I failed to build the project earlier because I unchecked the "Precompiled header" option when creating projects for all the libraries. When linking the libraries to my mediaServer project, VS was unable to resolve all the functions.
I was able to make it work by rebuilding them with "Precompiled header" option checked, and add #include "stdafx.h" to each and every *.cpp file.
Afterthought: I have a feeling that I only need to turn on "Precompiled header" option for the mediaServer project. Let me know if you have tried and succeeded. ;-)
Update 2
Nope. I had to turn on Precompiled Header for each and every one of the static library projects. And add #include "stdafx.h" to ~200 *.cpp files. Yep.
Update
I took a look at your full dump:
1>UsageEnvironment.lib(HashTable.obj) : error LNK2001: unresolved external symbol "void __cdecl operator delete(void *)" (??3#YAXPAX#Z)
Based on this first error, what ever source you compiled for your UsageEnviroment Lib, has a reference to a delete operator function. My guess is that either you don't have the correct source code you altered it. Can paste the UsageEnvironment.hh file contents?
I happened to be working on building this right now, I just got it working this morning, and per your request I compiled the Test Program "mediaServer". We are operating on a few assumptions here, we are assuming that you built the static libraries correctly.
Assuming the static libraries are correct this is the solution your looking for:
Include:
c:\Live555\BasicUsageEnvironment\include
c:\Live555\liveMedia\include
c:\Live555\UsageEnvironment\include;
c:\Live555\groupsock\include
$(IncludePath)
Lib Paths:
"*Insert path to your lib files here*";
$(LibraryPath)
Linker input:
Ws2_32.lib
groupsock.lib
BasicUsageEnvironment.lib
liveMedia.lib
UsageEnvironment.lib
libBasicUsageEnvironment.lib
libgroupsock.lib
Your solution folder should look like this:
Make sure the files in Bold are there.
your Source Folder should have the following files:
mediaServer:
**DynamicRTSPServer.cpp**
**DynamicRTSPServer.hh**
**live555MediaServer.cpp**
mediaServer.vcxproj
mediaServer.vcxproj.filters
ReadMe.txt
**rtcp_from_spec.c**
**rtcp_from_spec.h**
stdafx.cpp
stdafx.h
targetver.h
**version.hh**
Based on your errors its looks like you have incorrect source files included in your project, those unresolved reference don't appear anywhere in the live555 project tar file.
http://live555.com/liveMedia/public/live555-latest.tar.gz
If this solution doesn't work, please provide screen shots of your project settings for the following tabs:
include directories
Linker Input
File listing for your project folder.
Let me know if this helps, if this doesn't work we will have to look into how your static libraries were built. We need to see where in your code, those external references are being made, and what ever is making those references need to be excluded as they don't appear in the live555 archive referenced in the link below.
I'm in the process of converting 32bit project to x64. In most cases it just means appending 64 to library paths (and eventually building those libraries for x64). Now I assume all libraries are already ready and the code is also x64 compatible. But I keep getting errors for boost zlib library, like these:
error LNK2019: unresolved external symbol inflateEnd
error LNK2019: unresolved external symbol inflate
error LNK2019: unresolved external symbol inflateInit_
error LNK2019: unresolved external symbol deflateEnd
error LNK2019: unresolved external symbol deflate
error LNK2001: unresolved external symbol "int const boost::iostreams::zlib::default_compression"
error LNK2001: unresolved external symbol "int const boost::iostreams::zlib::deflated"
error LNK2001: unresolved external symbol "int const boost::iostreams::zlib::default_strategy"
I enabled verbose mode for linker (in MS Visual Studio you do this by adding /VERBOSE:LIB to additional linker options). Thanks to that, I can see this output line:
Searching .\..\..\libs\boost145\stage\lib64\libboost_zlib-vc100-mt-gd-1_45.lib
That would imply that the library was found in the boost145\stage\lib64. So what should I be looking for now?
One strange thing is that file that defines the first group of missing symbols (those that are not within boost) has header files within the project, zlib.h and zconf.h. Maybe this is some hint? The zlib.h defines external symbols as:
ZEXTERN int ZEXPORT inflateEnd OF((z_streamp strm));
Obvious question is: where the hell is lib file for this header file?
I had the same issue, to resolve the errors I download the source from zlib and built the x64 dlls/libs locally. There were a couple issues with solution file downloaded, fixes are described below.
Zlib 1.2.8 source code: http://zlib.net/zlib128.zip
Solution File for VS2012 is located at: zlib-1.2.8\contrib\vstudio\vc11\zlibvc.sln
Fixes:
Change:
<Command>cd ..\..\..\contrib\masmx64
bld_ml64.bat</Command>
to:
<Command>cd ..\..\contrib\masmx64
bld_ml64.bat</Command>
In zlibvc project properties -> Linker -> Advanced -> Image Has Safe Exception Handlers -> set to No (/SAFESEH:NO). Info about SAFESEH: Compiling libffi with VS2012 fails with fatal error LNK1281: Unable to generate SAFESEH image
This is my situation (I am very new to C++ MFC coding and I am trying to debug an existing application project)
I use this line in my code (in a visual studio 2012 MFC project)
CoCreateInstance(CLSID_PortableDeviceValues, NULL,
CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&x));
While I run the project, i get a linker error like this
error LNK2001: unresolved external symbol _CLSID_PortableDeviceValues
This happens for all the CLSID values that I am referring to in the code. Like this
error LNK2001: unresolved external symbol
_CLSID_PortableDeviceKeyCollection
error LNK2001: unresolved external symbol _IID_IPortableDeviceEventCallback
error LNK2001: unresolved external symbol _CLSID_PortableDeviceManager
error LNK2001: unresolved external symbol _CLSID_PortableDeviceServiceFTM
I checked for the declaration of "CLSID_PortableDeviceValues" and it was found in "PortableDeviceTypes.h" and I have imported that library as well.
I do not get any compiler error, but run into the linker errors mentioned above..
Can someone please help me out here. I could not resolve this ..
You will need to add PortableDeviceGUIDs.lib to your project.
(Look up the section "Requirements" in the MSDN documentation for IPortableDeviceValues)
When the linker builds your project, it is looking for the implementation data that is behind the identifier CLSID_PortableDeviceValues. This data is in the library PortableDeviceGUIDs.lib, and the linker has to be told to use this library.
The header file you included in your source code only declares the symbol "CLSID_PortableDeviceValues", without importing its implementation.
I have a question related to invoking a C++ library. The compilation of the library is successful. After that, the library is invoked by a normal executable program. However, several link errors occur.I give an example to illustrate my problem.
I have download an old version of TIFF library (version 3.6.1) and then compiled it to a static library: tiff.lib. After that I wrote an executable program for reading and writing TIFF files by invoking the library. However, the following errors appear:
2>tiff.lib(tif_jpeg.obj) : error LNK2001: unresolved external symbol __TIFFmalloc
2>tiff.lib(tif_lzw.obj) : error LNK2001: unresolved external symbol __TIFFmalloc
2>tiff.lib(tif_dirinfo.obj) : error LNK2001: unresolved external symbol __TIFFmalloc
2>tiff.lib(tif_luv.obj) : error LNK2001: unresolved external symbol __TIFFmalloc
2>tiff.lib(tif_pixarlog.obj) : error LNK2001: unresolved external symbol __TIFFmalloc
2>tiff.lib(tif_zip.obj) : error LNK2001: unresolved external symbol __TIFFmalloc
2>tiff.lib(tif_dirwrite.obj) : error LNK2001: unresolved external symbol __TIFFmalloc
2>tiff.lib(tif_write.obj) : error LNK2001: unresolved external symbol __TIFFmalloc
2>tiff.lib(tif_dirread.obj) : error LNK2001: unresolved external symbol __TIFFmalloc
I cannot understand why I will receive link errors as tiff.lib has been built successfully and it has also been linked successfully by my executable program. If something wrong with tiff.lib, I expect the link errors should appear during the compilation and link procedure when building the lib. Any ideas will be appreciated!
EDIT: I add some details in order to find the solution. tiff.lib is built as a static library, and when I use dumpbin.exe /exports tiff.lib to display all definitions exported in the library, the following message is given:
Dump of file tiff.lib
File Type: LIBRARY
Summary
3B8 .bss
9405 .data
D5640 .debug$S
C38 .debug$T
C4E .drectve
19E79 .rdata
84 .rtc$IMZ
84 .rtc$TMZ
3363E .text
It seems that no symbols are exported.
I think tiff.lib is C library and you are linking in c++. So I guess you will need to use extern "C" to include its header .h file.
extern "C"
{
#include<tiff.h>
}
Something like that above is just example. Also make sure you are setting correct calling convention in project property page of your c++ project
C/C++ ----------> Advanced ---------->Call Convention--->_cdecl(/Gd) //Set only if required
C/C++----------->Advanced------------>Compile As----->C++ Code(/TP)
Based on the discussions, I have come to realize that my program's error lies in the fact that some functions have not been defined correctly. It may happen that in some libraries the function may be declared in the head file with the keyword "extern". However, the implementation of the function is defined in another file, which could be excluded when building the library. Function calling conversion, as explained by #praks411, is another scenario, which you should consider when you meet with the same problem.
I have a program using OpenGL 3.2(+libs) and FreeType2. Then an other program with Boost and OpenSSL. The OpenGL side was to make sure text could be rendered and the boost/openssl program is to do a secure login/game server.
Both programs work fine by them selfs.
However adding Boost and OpenSSL to the game(GL + freetype) project caused it to fail to link.
I have linked the following libs as well as including there includes folder.
glimg.lib
glutil.lib
glfw.lib
opengl32.lib
freetype.lib
glew32.lib
user32.lib
libeay32.lib
ssleay32.lib
The linker error is.
1>LINK : warning LNK4098: defaultlib 'LIBCMT' conflicts with use of other libs; use /NODEFAULTLIB:library
1>libeay32.lib(cryptlib.obj) : error LNK2001: unresolved external symbol __imp__DeregisterEventSource#4
1>libeay32.lib(cryptlib.obj) : error LNK2001: unresolved external symbol __imp__ReportEventA#36
1>libeay32.lib(cryptlib.obj) : error LNK2001: unresolved external symbol __imp__RegisterEventSourceA#8
1>libeay32.lib(rand_win.obj) : error LNK2001: unresolved external symbol __imp__DeleteDC#4
1>libeay32.lib(rand_win.obj) : error LNK2001: unresolved external symbol __imp__DeleteObject#4
1>libeay32.lib(rand_win.obj) : error LNK2001: unresolved external symbol __imp__GetBitmapBits#12
1>libeay32.lib(rand_win.obj) : error LNK2001: unresolved external symbol __imp__BitBlt#36
1>libeay32.lib(rand_win.obj) : error LNK2001: unresolved external symbol __imp__GetObjectA#12
1>libeay32.lib(rand_win.obj) : error LNK2001: unresolved external symbol __imp__SelectObject#8
1>libeay32.lib(rand_win.obj) : error LNK2001: unresolved external symbol __imp__CreateCompatibleBitmap#12
1>libeay32.lib(rand_win.obj) : error LNK2001: unresolved external symbol __imp__GetDeviceCaps#8
1>libeay32.lib(rand_win.obj) : error LNK2001: unresolved external symbol __imp__CreateCompatibleDC#4
1>libeay32.lib(rand_win.obj) : error LNK2001: unresolved external symbol __imp__CreateDCA#16
1>.\BasicTexture.exe : fatal error LNK1120: 13 unresolved externals
Runtime Library is set to Multi-threaded DLL (/MD)
I have no idea what to do I would really appreciate any help.
You are trying to compile with /MD, which is probably the right choice, but some code (probably one of the libraries) was built with /MT, and you can't have it both ways in the same program. You need to figure out which library was built with /MT and rebuild it with /MD.
Unresolved external error messages are produced when the compiler generates code referencing externally defined objects or functions and the linker fails to find those. To generate code invoking a function call the compiler only needs a declaration:
extern "C" BOOL DeregisterEventSource ( HANDLE hEventLog );
This is enough information to produce a call instruction (except for the target address). The extern keyword informs the compiler that the implementation is defined elsewhere. Consequently it cannot know the target address which has to be filled in later. When the compiler is done it is the linker's job to connect the pieces together. It uses the information gathered from the import libraries to look up the required offsets.
Windows API calls are easily spotted in the error log. They have an __imp__ prefix and sometimes an A or W postfix followed by #<n> where <n> indicates the number of bytes required for the arguments. In the case of a Windows API call you can then look up the function in the MSDN (like DeregisterEventSource). Towards the bottom are the Requirements where you can find the import library name.
The conflict warning indicates that not all of the modules use the same runtime library. Even though this is just a warning it is a serious issue and should be resolved. You get this warning if you mix /MD and /MT compiler switches, but also, if you mix release and debug runtime libraries (like /MD and /MDd). To diagnose this message you can use the /VERBOSE:LIB linker switch to determine which libraries the linker is searching. Additional information on this warning can be found at this MSDN link.