Calling DLL functions?

Sorry if this has been asked before, but I'm pretty new to FASM, and I have searched but nothing seems to be what I'm after.

Basically, I have a ton of DLL's which I've wrote myself over the years, and have used them in another language to plug the holes, and a load of them I dont intend to rewrite.

So is it possible, say, if I had a DLL called "printer.dll" (Written in C++) and a function named "OpenPrinter()" which returns a boolean value depending if the file has been created or not... Something like:-

Code:

//Printer.DLL

//Globals
PRINTDLG pd;
DOCINFO di;
ULONG_PTR gdiToken;

#define MYDECL extern "C" _declspec(dllexport)
#define MYCALL _stdcall

MYDECL bool MYCALL _OpenPrinter(void)
{
   GdiplusStartupInput gdiplusStartupInput;
   GdiplusStartup(&gdiToken, &gdiplusStartupInput, NULL);

   
   ZeroMemory(&di, sizeof(di));
   di.cbSize = sizeof(di);
   di.lpszDocName = "New Doc";
   
   ZeroMemory(&pd, sizeof(pd));
   pd.lStructSize = sizeof(pd);
   pd.Flags = PD_RETURNDC;

   if(!PrintDlg(&pd))
   {
       return(false);
   }
    
       return(true);
}

After decoration, we'll have something like "_OpenPrinter@0" or along them lines... So the question is, how would I access this through FASM (In code)

Thanks for any help in advance!

format PE GUI 4.0 entry start include 'win32a.inc' section '.code' code readable executable start: call [_OpenPrinter] ;call your function from the dll (no arguments) cmp eax,0 ;check the return value ;... invoke ExitProcess,0 section '.idata' import data readable writeable library kernel32,'kernel32.dll',\ printer,'printer.dll' import kernel32,\ ExitProcess,'ExitProcess' import printer,\ _OpenPrinter,'_OpenPrinter'