- DLL Tutorial
- DLL - Home
- DLL - Introduction
- DLL - How to Write
- DLL - Registration
- DLL - Tools
- DLL - Tips
- DLL - Examples
- DLL Useful Resources
- DLL - Quick Guide
- DLL - Useful Resources
- DLL - Discussion
Making DLL's in Microsoft Visual C++ 6.0
Example 1 : Working from the Command Line
Now we make a one-line DLL. Here's the source:
extern "C" __declspec(dllexport) void myfun(int * a){*a = - *a; }
Save this to file myfun.cpp and compile it from the DOS prompt with:
cl -LD myfun.cpp
The -LD switch says to generate a DLL. Next we make an executable, which calls the DLL. Here's the source:
#include iostream.h extern C __declspec(dllimport) void myfun ( int * a); void main(void) { int a = 6; int b = a; myfun(&b); cout << '-' << a << " is " << b << "! \n"; }
Save this to the file main.cpp. Then compile and link from the command prompt with:
cl main.cpp /link myfun.lib
Execute it from the command line (just type 'main').
Example 2 : Using VC++ IDE to Create DLL
In Microsoft Visual C++ 6.0, you can create a DLL by selecting either the Win32 Dynamic-Link Library project type or the MFC AppWizard (dll) project type.
The following code is an example of a DLL that was created in Visual C++ by using the Win32 Dynamic-Link Library project type.
// SampleDLL.cpp #include "stdafx.h" #define EXPORTING_DLL #include "sampleDLL.h" BOOL APIENTRY DllMain(HANDLE hModule, DWORD ul_reason_for_call, LPVOID lpReserved) { return TRUE; } void HelloWorld() { MessageBox( NULL, TEXT("Hello World"), TEXT("In a DLL"), MB_OK); }
// File: SampleDLL.h #ifndef INDLL_H #define INDLL_H #ifdef EXPORTING_DLL extern __declspec(dllexport) void HelloWorld(); #else extern __declspec(dllimport) void HelloWorld(); #endif #endif
dll_examples.htm
Advertisements
To Continue Learning Please Login
Login with Google