Get Warning LNK4222 , How to fix it ?

[headshot]

Hello Everybody
I have a project ALT with C++ program.
After build , I get some of warning in file Bhonew.def


I have read this reference http://msdn.microsoft.com/en-us/libr...=vs.71%29.aspx

  Open the project's Property Pages dialog box. For details, see Setting Visual C++ Project Properties.
    Click the Linker folder.
    Click the Command Line property page.
    Type the option into the Additional Options box.

But i don`t known how to input at here
Can you help me ?Thank you

[weaknessforcats]

Your export functions are always located by name using GetProcAddress. Remove your export ordinals from the DEF file.

Read: http://msdn.microsoft.com/en-us/libr...(v=vs.71).aspx

[headshot]

hi weaknessforcats
Follow http://msdn.microsoft.com/en-us/libr...=vs.71%29.aspx
Should i do it ? .

; BhoNew.def : Declares the module parameters.

LIBRARY      "BhoNew.DLL"

EXPORTS
	DllCanUnloadNow  
	DllGetClassObject 
	DllRegisterServer   
	DllUnregisterServer

[weaknessforcats]

So you are creating BhoNew.DLL?

Then to use it in your application project just call LoadLibrary followed by GetProcAddress for these functions and then call the function sing the returned function pointer.


Here's an example:

#include <iostream>
using namespace std;

#include <windows.h>



int main()
{
	
	

	cout << "Calling functions from a dll" << endl;

	//First, load the dll into memory
	HMODULE theDll = LoadLibrary("C:\\Scratch\\ClassDemos\\ADll\\Debug\\ADll.dll");
	if (!theDll)
	{
		cout << "The dll failed to load" << endl;
		return 1;
	}

	//Second, get the address of the desried function from the dll
	FARPROC addr = GetProcAddress(theDll, "DisplayFromDll");
	if (!addr)
	{
		
		//Look up the error in the system errors list
		unsigned int what = GetLastError();
		if (what == ERROR_PROC_NOT_FOUND)
		{
			cout << "Function not found in the dll" << endl;
		}
		else
		{
			cout << "Error: " << what << endl;
		}
		return 2;
	}
    cout << "The function has been located in the dll" << endl;
	//Declare a function pointer that can accept the address of the function.
	//You will need to know the function prototype to do this.
	//Dll function prototypes should be provided by the vendor of the dll
	void (__stdcall *DisplayFromDll)();
	//Type-cast the address returned from GetProcAddress to the function pointer type
	DisplayFromDll = reinterpret_cast<void (__stdcall *)()>  (addr);
	//Now use the function pointer to call the function:
    DisplayFromDll();

	//If you don't use a .def file in the dll, you must use the mangled name
	//Second, get the address of the desried function from the dll
	addr = GetProcAddress(theDll, "AreaOfSquare");
	if (!addr)
	{
		
		//Look up the error in the system errors list
		unsigned int what = GetLastError();
		if (what == ERROR_PROC_NOT_FOUND)
		{
			cout << "Function not found in the dll" << endl;
		}
		else
		{
			cout << "Error: " << what << endl;
		}
		return 2;
	}

	cout << "The function has been located in the dll" << endl;
	//Declare a function pointer that can accept the address of the function.
	//You will need to know the function prototype to do this.
	//Dll function prototypes should be provided by the vendor of the dll
	int (__stdcall *AreaOfSquare)(int, int);
	//Type-cast the address returned from GetProcAddress to the function pointer type
	AreaOfSquare = reinterpret_cast<int (__stdcall*)(int,int)>  (addr);
	//Now use the function pointer to call the function:
    cout << "The area of a 6x8 square is " << AreaOfSquare(6,8) << endl;;

	//Finally, unload the dll from memory
	FreeLibrary(theDll);

	return 0;
}