Quote:

调用代码如下:
// A simple program that uses LoadLibrary and
// GetProcAddress to access myPuts from Myputs.dll.

#include <stdio.h>
#include <windows.h>

extern "C"_declspec(dllimport) typedef int (*MYPROC)(LPTSTR);

VOID main(VOID)
{
  HINSTANCE hinstLib;
  MYPROC ProcAdd;
  BOOL fFreeResult, fRunTimeLinkSuccess = FALSE;

  // Get a handle to the DLL module.

  hinstLib = LoadLibrary(TEXT("dll_msdn"));

  // If the handle is valid, try to get the function address.

  if (hinstLib != NULL)
  {
    ProcAdd = (MYPROC) GetProcAddress(hinstLib, TEXT("myPuts"));

    // If the function address is valid, call the function.

    if (NULL != ProcAdd)
    {
        fRunTimeLinkSuccess = TRUE;
        (ProcAdd) (TEXT("Message via DLL function\n"));
    }

    // Free the DLL module.

    fFreeResult = FreeLibrary(hinstLib);
  }

  // If unable to call the DLL function, use an alternative.

  if (! fRunTimeLinkSuccess)
    printf("Error\n");
}

Quote:

dll源码如下:

// The myPuts function writes a null-terminated string to
// the standard output device.

// The export mechanism used here is the __declspec(export)
// method supported by Microsoft Visual Studio, but any
// other export method supported by your development
// environment may be substituted.


#include <windows.h>

#define EOF (-1)

#ifdef __cplusplus   // If used by C++ code,
extern "C" {       // we need to export the C interface
#endif

__declspec(dllexport) int myPuts(LPTSTR lpszMsg)
{
  DWORD cchWritten;
  HANDLE hStdout;
  BOOL fRet;

  // Get a handle to the standard output device.

  hStdout = GetStdHandle(STD_OUTPUT_HANDLE);
  if (INVALID_HANDLE_VALUE == hStdout)
    return EOF;

  // Write a null-terminated string to the standard output device.

  while (*lpszMsg != '\0')
  {
    fRet = WriteFile(hStdout, lpszMsg, 1, &cchWritten, NULL);
    if( (FALSE == fRet) || (1 != cchWritten) )
        return EOF;
    lpszMsg++;
  }
  return 1;
}

#ifdef __cplusplus
}
#endif