为什么我的GetMenuItemInfo调用不起作用？ [英] Why is my GetMenuItemInfo call not working?

问题描述

所以，我正在使用它来检索菜单作为字符串列表并将其返回到主程序。请注意，Win32只是一个单独的类，我编写了一些主要的Win32调用。

So, I'm currently using this to retrieve a menu as a list of strings and return it back to the main program. Please note that "Win32" is just a separate class where I coded some of the main Win32 calls.

List<string> ls = new List<string>();
            IntPtr hMenu = Win32.GetMenu(hWnd);
     
                if (hMenu.ToInt32() != 0)
                {

                    for (int i = Win32.GetMenuItemCount(hMenu); i >= 0; i--)
                    {
                        uint MIIM_STRING = 0x00000040;
                        uint MFT_STRING  = 0x00000000;
                        Win32.MENUITEMINFO mif = new Win32.MENUITEMINFO();
                        mif.cbSize = (uint)Marshal.SizeOf(typeof(Win32.MENUITEMINFO));
                        mif.fMask = MIIM_STRING;
                        mif.fType = MFT_STRING;
                        mif.dwTypeData = null;
                        bool a = Win32.GetMenuItemInfo(hMenu, 0, true, ref mif);
                        ls.Add(mif.dwTypeData);
                    }
                }
       
            return ls;

然而，每当我运行程序时，dwTypeData仍然返回null。我知道我的声明和语法是正确的，因为GetMenuItemInfo返回true。必须有一些我缺少的东西......任何想法？

Yet, whenever I run the program, dwTypeData still returns null. I know my declarations and syntax is correct because GetMenuItemInfo returns true. There must be something I'm missing... any ideas?

推荐答案

你需要初始化dwTypeData和cch数据成员...

You need to initialize dwTypeData and cch data members...

List<string> ls = new List<string>();
IntPtr hMenu = Win32.GetMenu(hWnd);

    if (hMenu.ToInt32() != 0)
    {
        char[] szString = new char[256];
        for (int i = Win32.GetMenuItemCount(hMenu); i >= 0; i--)
        {
            uint MIIM_STRING = 0x00000040;
            uint MFT_STRING  = 0x00000000;
            Win32.MENUITEMINFO mif = new Win32.MENUITEMINFO();
            mif.cbSize = (uint)Marshal.SizeOf(typeof(Win32.MENUITEMINFO));
            mif.fMask = MIIM_STRING;
            mif.fType = MFT_STRING;
            mif.cch = 256;
            mif.dwTypeData = szString;
           
            bool a = Win32.GetMenuItemInfo(hMenu, 0, true, ref mif);
            ls.Add(mif.dwTypeData);
        }
    }

return ls;

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