首先实况为SendMessageTimeout:
http://msdn.microsoft.com/en-us/library/windows/desktop/ms644952%28v=vs.85%29.aspx转换C++代码转换为C#:SendMessageTimeout()
我有这样的C++代码,我想将其转换为C#:
LRESULT success = SendMessageTimeout(
HWND_BROADCAST,
WM_SETTINGCHANGE,
0,
(LPARAM) "Environment",
SMTO_ABORTIFHUNG,
5000,
NULL
);
我做什么在C#中:
[DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
public static extern IntPtr SendMessageTimeout(
IntPtr hWnd,
uint Msg,
UIntPtr wParam,
IntPtr lParam,
uint fuFlags,
uint uTimeout,
out UIntPtr lpdwResult
);
SendMessageTimeout(
(IntPtr)0xFFFFFFFF, //HWND_BROADCAST
0x001A, //WM_SETTINGCHANGE
(UIntPtr)0,
(IntPtr)"Environment", // ERROR_1: can't convert string to IntPtr
0x0002, // SMTO_ABORTIFHUNG
5000,
out UIntPtr.Zero // ERROR_2: a static readonly field can not be passed ref or out
);
查找到编组的C-串VS Marshal.StringToHGlobalUni + FreeHGlobal。对于最后一部分,只需定义一个本地并将其传入。 – Warty