Thread: Windows Link.exe error LNK2019 unresolved external symbol

I have an exe written in C to call a dll. It compiles with Clang and I'm linking it from the Visual Studio command line using link.exe. Link.exe gives me these errors:

error LNK2019: unresolved external symbol __imp_LoadLibraryA referenced in function WinMain
error LNK2019: unresolved external symbol __imp_GetProcAddress referenced in function WinMain
error LNK2019: unresolved external symbol __imp_FreeLibrary referenced in function WinMain
error LNK2019: unresolved external symbol __stdio_common_vsprintf referenced in function _vsnprintf_l
unresolved external symbol WinMainCRTStartup

These LNK2019 errors all relate to Windows API functions that are in Windows.h, and windows.h is in my header file.

This is the header file (SxSv.h):

Code:

#ifndef DLLHANDLER_C_
#define DLLHANDLER_C_
   
#include <windows.h>
#include <winbase.h>
#include <windef.h>
#include <stdio.h>
   
typedef int (*TestFunc)(int);
   
int loadDLL( void );
   
#endif

Code:

This is the C file (SxSv.c) :

#include "SxSv.h"
 
int WinMain()
{
  int status = 0;
  TestFunc _TestFunc;
  HINSTANCE testLibrary = LoadLibrary("SxSv.dll");
 
  if (testLibrary) {
    _TestFunc = (TestFunc) GetProcAddress(testLibrary, "SSXV");
    if (_TestFunc) {
      status = _TestFunc();
    }
 
    FreeLibrary(testLibrary);
 
  }
  return status;
}

The link string for Link.exe:

link SxSv SxSv.obj

I have an include for Windows.h specified in the header file, so what else do I need to reference?

Thanks.

Linker problems compiling as 64-bit

I was able to solve this problem by adding the following line to the Additional Library Directories:
C:\Program Files\Microsoft SDKs\Windows\v6.0A\Lib\x64

When you are not logged in, an ad is shown in that location.
Since you are using an ad-blocker, it appears as a blank space.

I still get the same errors.

Take a look at this:
Linker Tools Error LNK2019 | Microsoft Docs

It presumably needs to be something like this (all on one line):

Code:

link.exe
  /nologo
  /subsystem:windows
  /LIBPATH:"C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\Lib\x64\"
  /out:SxSv.exe
  kernel32.lib
  SxSv.obj

Structure - that article at Microsoft looks very useful. Thanks for the link. I will study it.

John C, it looks like we're getting somewhere. Your link string puts me in a better place. Here's what I get:

LINK : warning LNK4001: no object files specified; libraries used
LINK : warning LNK4068: /MACHINE not specified; defaulting to X86
LINK : fatal error LNK1159: no output file specified

Now I can specify /MACHINE and find out how link wants the output file specified (despite the out: directive on the command string, it wants something different).