在C#中動態調用native dll的導出函數

　　在 C++ 中我們能夠通過 LoadLibrary GetProcAddress 來動態調用 dll 的導出函數

　　在 C# 中也能夠用這樣的方式嗎？

　　在 DotNet 裡面這樣是可以的 這完全得益於 新增的一個函數

　　MarshalGetDelegateForFunctionPointer 方法

　　此方法在 NET Framework 版中是新增的

　　將非托管函數指針轉換為委托

　　實例代碼如下

　　 public delegate int MsgBox(int hwnd<fp class='fp-56e2f'></fp>string msg<fp class='fp-f8ics'></fp>string cpp<fp class='fp-66n73'></fp>int ok); [DllImport(<fp class='fp-s9yuo'></fp>Kernel<fp class='fp-a18a4'></fp><fp class='fp-9u8d3'></fp><fp class='fp-xs0zv'></fp>)] public static extern int GetProcAddress(int handle<fp class='fp-rlisi'></fp> String funcname); [DllImport(<fp class='fp-s9yuo'></fp>Kernel<fp class='fp-txfxu'></fp><fp class='fp-9u8d3'></fp><fp class='fp-4iy09'></fp>)] public static extern int LoadLibrary(String funcname); [DllImport(<fp class='fp-4iy09'></fp>Kernel<fp class='fp-a18a4'></fp><fp class='fp-9u8d3'></fp><fp class='fp-s9yuo'></fp>)] public static extern int FreeLibrary(int handle); private static Delegate GetAddress(int dllModule<fp class='fp-f8ics'></fp> string functionname<fp class='fp-rlisi'></fp> Type t) { int addr = GetProcAddress(dllModule<fp class='fp-f8ics'></fp> functionname); if (addr == <fp class='fp-usmsd'></fp>) return null; else return Marshal<fp class='fp-g8qhh'></fp>GetDelegateForFunctionPointer(new IntPtr(addr)<fp class='fp-56e2f'></fp> t); } private void button<fp class='fp-8ikcf'></fp>_Click(object sender<fp class='fp-56e2f'></fp> EventArgs e) { int huser<fp class='fp-txfxu'></fp><fp class='fp-kfrfh'></fp> = <fp class='fp-qx1pc'></fp>; huser<fp class='fp-i3ua5'></fp><fp class='fp-9u8d3'></fp> = LoadLibrary(<fp class='fp-s9yuo'></fp>user<fp class='fp-bpoca'></fp><fp class='fp-pytko'></fp><fp class='fp-g8qhh'></fp>dll<fp class='fp-ttenp'></fp>); MsgBox mymsg = (MsgBox)GetAddress(huser<fp class='fp-a18a4'></fp><fp class='fp-9u8d3'></fp><fp class='fp-rlisi'></fp> <fp class='fp-xs0zv'></fp>MessageBoxA<fp class='fp-s9yuo'></fp><fp class='fp-f8ics'></fp> typeof(MsgBox)); mymsg(this<fp class='fp-g8qhh'></fp>Handle<fp class='fp-g8qhh'></fp>ToInt<fp class='fp-a18a4'></fp><fp class='fp-9u8d3'></fp>()<fp class='fp-rlisi'></fp> txtmsg<fp class='fp-me8pu'></fp>Text<fp class='fp-66n73'></fp> txttitle<fp class='fp-86sax'></fp>Text <fp class='fp-rlisi'></fp> <fp class='fp-ek1am'></fp><fp class='fp-dkt5y'></fp>); FreeLibrary(huser<fp class='fp-txfxu'></fp><fp class='fp-kfrfh'></fp>); }

　　

From:http://tw.wingwit.com/Article/program/net/201311/12542.html