# GetCharacterPlacement

### C# Signature:

```cs
[DllImport("gdi32.dll", EntryPoint="GetCharacterPlacementW")]
    static extern uint GetCharacterPlacementW(IntPtr hdc, [MarshalAs(UnmanagedType.LPWStr)] string lpString,
       int nCount, int nMaxExtent, ref GCP_RESULTS lpResults, uint dwFlags);
```

### User-Defined Types:

```cs
[StructLayout(LayoutKind.Sequential)]
    public struct GCP_RESULTS
    {
        public int StructSize;
        [MarshalAs(UnmanagedType.LPTStr)]
        public string OutString;
        public IntPtr Order;
        public IntPtr Dx;
        public IntPtr CaretPos;
        public IntPtr Class;
        public IntPtr Glyphs;
        public int GlyphCount;
        public int MaxFit;
    }

    [Flags]
    public enum GCPFlags : uint
    {
        GCP_DBCS = 0x0001,
        GCP_REORDER = 0x0002,
        GCP_USEKERNING = 0x0008,
        GCP_GLYPHSHAPE = 0x0010,
        GCP_LIGATE = 0x0020,
        GCP_DIACRITIC = 0x0100,
        GCP_KASHIDA = 0x0400,
        GCP_ERROR = 0x8000,
        GCP_JUSTIFY = 0x00010000,
        GCP_CLASSIN = 0x00080000,
        GCP_MAXEXTENT = 0x00100000,
        GCP_JUSTIFYIN = 0x00200000,
        GCP_DISPLAYZWG = 0x00400000,
        GCP_SYMSWAPOFF = 0x00800000,
        GCP_NUMERICOVERRIDE = 0x01000000,
        GCP_NEUTRALOVERRIDE = 0x02000000,
        GCP_NUMERICSLATIN = 0x04000000,
        GCP_NUMERICSLOCAL = 0x08000000,
    }
```

### Sample Code:

```cs
public int GetCaretPostion(string str, int index)
    {
        IntPtr OldFont = SelectObject(this.DC, this.Font);

        int len = str.Length;
        int[] order = new int[len];
        int[] dx = new int[len];
        int[] caret = new int[len];
        byte[] clss = new byte[len];
        short[] glys = new short[len];

        GCHandle ordHnd = GCHandle.Alloc(order, GCHandleType.Pinned);
        GCHandle dxHnd = GCHandle.Alloc(dx, GCHandleType.Pinned);
        GCHandle carHnd = GCHandle.Alloc(caret, GCHandleType.Pinned);
        GCHandle clsHnd = GCHandle.Alloc(clss, GCHandleType.Pinned);
        GCHandle glyHnd = GCHandle.Alloc(glys, GCHandleType.Pinned);

        try
        {
        GCP_RESULTS rs = new GCP_RESULTS();
        rs.StructSize = Marshal.SizeOf(typeof(GCP_RESULTS));

        rs.OutString = new String('\0', len + 2);
        rs.Order = ordHnd.AddrOfPinnedObject();
        rs.Dx = dxHnd.AddrOfPinnedObject();
        rs.CaretPos = carHnd.AddrOfPinnedObject();
        rs.Class = clsHnd.AddrOfPinnedObject();
        rs.Glyphs = glyHnd.AddrOfPinnedObject();

        rs.GlyphCount = len;
        rs.MaxFit = 0;

        GCPFlags flg = GCPFlags.GCP_GLYPHSHAPE;
        uint r = GetCharacterPlacement(this.DC, str, len, 0, ref rs, (uint)flg);
        if (r == 0)
            throw new Exception(string.Format("GeCharacterPlacement Error {0}", Marshal.GetLastWin32Error()));
        }
        finally
        {
        ordHnd.Free();
        dxHnd.Free();
        carHnd.Free();
        clsHnd.Free();
        glyHnd.Free();
        } 

        SelectObject(this.DC, OldFont);

        return caret[index];
    }
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://pinvokeisalive.gitbook.io/pinvoke/desktopfunctions/gdi32/getcharacterplacement.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.