Question

谁试过用C#+API挑战MessageBoxIndirect-CSDN论坛

Answer 1

前提是你的这个MsgParams结构必须Marshal正确哦，如果不正确的话不会导致调用Marshal.SizeOf的失败，但你的这个函数仍然无法调用。cbSize的大小是为以后扩展用的

public struct HelpInfo
{
}
public delegate void MsgboxCallback(HelpInfo helpInfo);

[StructLayout(LayoutKind.Sequential,CharSet=CharSet.Auto)]
public struct MsgboxParams
{
public int cbSize;
public IntPtr hwndOwner;
public IntPtr hInstance;
public string text;
public string caption;
public int style;
public string icon;
public int helpId;
public IntPtr callback;
public int languageId;
}
class Program
{

[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern int MessageBoxIndirect(ref MsgboxParams param);

[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern IntPtr LoadIcon(IntPtr hInstance, string iconName);

static void Main(string[] args)
{
MsgboxParams mp=new MsgboxParams();

mp.hwndOwner = IntPtr.Zero;
mp.hInstance = IntPtr.Zero;
mp.text = "ok";
mp.caption = "ti xing";
mp.style = 0;
mp.icon = "32512";
mp.helpId = 0;
mp.callback = IntPtr.Zero;
mp.languageId = 0;
mp.cbSize = Marshal.SizeOf(mp);

MessageBoxIndirect(ref mp);
}
}