WM_SETTEXT writes chinese letters

Question

1.00/5 (1 vote)

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I want to set the text of my Edit Control. When I do, the new content is Chinese.
For example, this:

C#

[DllImport("user32.dll")]
public static extern int SendMessageW([InAttribute] System.IntPtr hWnd, int Msg, int wParam, string lParam);

[DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
internal static extern IntPtr GetFocus();

IntPtr c = GetFocus();
SendMessageW(c, 12, 0, "Test"); //Notice that 12 = WM_SETTEXT

sets my Edit Control to this: 敔瑳

What I have tried:

I've tried finding a solution online and asked the same Question here

Posted 23-Jul-18 3:57am

Markus Rechberger

Updated 23-Jul-18 4:18am

v2

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Comments

Dave Kreskowiak 23-Jul-18 10:13am

We'd need to see the rest of the relevant code, especially your definition of SendMessageW.

[no name] 23-Jul-18 10:16am

Oops, I'm sorry, I forgot that. Now I added the definition of SendMessageW

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Richard Deeming · Accepted Answer · 2018-07-23T04:19:00

Solution 1

According to pinvoke.net[^], you need a MarshalAs attribute on the string parameter:

C#

[DllImport("user32.dll")]
public static extern int SendMessageW(
    [InAttribute] System.IntPtr hWnd, 
    int Msg, 
    int wParam, 
    [MarshalAs(UnmanagedType.LPWStr)] string lParam);

Posted 23-Jul-18 4:19am

Richard Deeming