由于某些原因,每当我的C#.NET 2.0应用程序调用GetProcAddress时,它总是返回零。

public class MyClass
{
    internal static class UnsafeNativeMethods
    {
        [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        internal static extern IntPtr LoadLibrary(string lpFileName);

        [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        internal static extern bool SetDllDirectory(string lpPathName);

        [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        internal static extern IntPtr GetProcAddress(IntPtr hModule, string procName);
    }

    private void MyFunc()
    {
        IntPtr _dllHandle;
        IntPtr _fptr;
        string _fullPath = ".\\mydll.dll";
        string _procName = "MyDllFunc";

        _dllHandle = UnsafeNativeMethods.LoadLibrary(_fullPath);
        _fptr = UnsafeNativeMethods.GetProcAddress(_dllHandle, _procName); // <-- Always returns zero.
    }
}

我确定函数名称的拼写正确,并且_fullPath大概是正确的,因为_dllHandle始终被分配为非零值。感谢您提供的任何见解。谢谢。

最佳答案

GetProcAddress仅具有ANSI风格,因此我们通过将其编码字符串参数时始终使用ANSI来帮助运行时。我们还防止运行时查找不存在的GetProcAddressA,因为C#的默认设置是将ExactSpelling设置为false。

http://www.pinvoke.net/default.aspx/kernel32.getprocaddress

07-26 03:58