C#在64位程序上获取LoadLibraryA返回0

Question

平台选x86时正常运行
选x64时if (loadaddr == 0)就return了

[DllImport("kernel32.dll")]
        public static extern int GetProcAddress(int hwnd, string lpname);

        [DllImport("kernel32.dll")]
        public static extern int GetModuleHandleA(string name);

var kernel32 = GetModuleHandleA("kernel32.dll");
if (kernel32 == 0)
{
        Console.WriteLine("GetModuleHandleA kernel32.dll failed!");
        return 1;
}
var loadaddr = GetProcAddress(kernel32, "LoadLibraryA");
if (loadaddr == 0)
{
         Console.WriteLine("GetProcAddress LoadLibraryA failed!");
         return 1;
}

Answer 1

dll引入声明错误，修改为：

        [DllImport("kernel32.dll")]
        public static extern IntPtr GetProcAddress(IntPtr hwnd, string lpname);
        [DllImport("kernel32.dll")]
        public static extern IntPtr GetModuleHandleA(string name);
        private int test()
        {
            var kernel32 = GetModuleHandleA("kernel32.dll");
            if (kernel32 == IntPtr.Zero)
            {
                Console.WriteLine("GetModuleHandleA kernel32.dll failed!");
                return 1;
            }
            var loadaddr = GetProcAddress(kernel32, "LoadLibraryA");
            if (loadaddr == IntPtr.Zero)
            {
                Console.WriteLine("GetProcAddress LoadLibraryA failed!");
                return 1;
            }
            return 0;
        }