Question

我之前从未这样做过，而且我对如何将数据类型转换为C＃感到困惑。这是function I'm trying to import：

BOOL InternetSetOption(
  __in  HINTERNET hInternet,
  __in  DWORD dwOption,
  __in  LPVOID lpBuffer,
  __in  DWORD dwBufferLength
);

我要做的就是在WebBrowser控件上设置代理设置。我将这些数据类型映射到C＃？

Answer 1

请查看http://pinvoke.net以获取文档和示例代码。

Answer 2

尝试以下签名

public partial class NativeMethods {

    /// Return Type: BOOL->int
    ///hInternet: void*
    ///dwOption: DWORD->unsigned int
    ///lpBuffer: LPVOID->void*
    ///dwBufferLength: DWORD->unsigned int
    [System.Runtime.InteropServices.DllImportAttribute("<Unknown>", EntryPoint="InternetSetOption")]
    [return: System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.Bool)]
public static extern  bool InternetSetOption([System.Runtime.InteropServices.InAttribute()] System.IntPtr hInternet, uint dwOption, [System.Runtime.InteropServices.InAttribute()] System.IntPtr lpBuffer, uint dwBufferLength) ;

}

Answer 3

InternetSetOption函数的PInvoke page指定了如何声明它，以及一些方便的示例代码。

单独的声明如下：

public struct INTERNET_PROXY_INFO
{
    public int dwAccessType;
    public IntPtr proxy;
    public IntPtr proxyBypass;
}

[DllImport("wininet.dll", SetLastError = true)]
private static extern bool InternetSetOption(IntPtr hInternet,
    int dwOption, IntPtr lpBuffer, int lpdwBufferLength);

如何将此函数从inet.dll导入.NET？

3 个答案: