LISTVIEW往HEADER里加图片的东东

最新推荐文章于 2021-06-04 02:22:57 发布

转载最新推荐文章于 2021-06-04 02:22:57 发布 · 1.1k 阅读

文章标签：

#listview #header #image #string #struct #user

·Win32 SDK 和 C++ 专栏收录该内容

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博客给出了在类中声明SendMessage函数的代码，还创建了SetHeaderImageList和SetHeaderImage两个函数。前者用于获取标题控件并设置图像列表，后者用于将图像放入标题栏。最后提示使用这些函数设置图像列表和图像。

// Declare this structure first
[System.Runtime.InteropServices.StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
struct HDITEM
{
     public uint mask;
      public int cxy;
    public IntPtr pszText;    // !!!!!! If anybody should know how i can pass a string here instead of an IntPtr (which is a hack), please let me know!!!!!!!
     public IntPtr hbm;
     public int cchTextMax;
     public int fmt;
     public IntPtr lParam;
     public int iImage;
     public int iOrder;
     public uint type;
     public IntPtr pvFilter;
}

// Put this declaration in your class
[DllImport("USER32.DLL", EntryPoint= "SendMessage"；)]
public static extern IntPtr SendMessage(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam);

// Make a SetHeaderImageList function
private void SetHeaderImageList(ListView lv, ImageList il)
{
     // Get the header ctrl
     int LVM_GETHEADER = 0x1000 + 31;
     IntPtr hwndHeader = SendMessage(lv.Handle, LVM_GETHEADER, new IntPtr(0), new IntPtr(0));
     // Set the imagelist of the header ctrl
     int HDM_SETIMAGELIST = 0x1200 + 8;
     SendMessage(hwndHeader, HDM_SETIMAGELIST, new IntPtr(0), il.Handle);
}

// Make a SetHeaderImage function
unsafe private void SetHeaderImage(ColumnHeader ch, int imageIndex)
{
     // Get the header ctrl
     int LVM_GETHEADER = 0x1000 + 31;
     IntPtr hwndHeader = SendMessage(ch.ListView.Handle, LVM_GETHEADER, new IntPtr(0), new IntPtr(0));
     // Put the image in the header
     uint HDI_IMAGE = 0x0020;
     uint HDI_FORMAT = 0x0004;
     int HDF_LEFT = 0;
     int HDF_STRING = 0x4000;
     int HDF_IMAGE = 0x0800;
     int HDM_SETITEM = 0x1200 + 4;
     HDITEM hdItem = new HDITEM();
     hdItem.mask = HDI_IMAGE | HDI_FORMAT;
     hdItem.fmt = HDF_LEFT | HDF_STRING | HDF_IMAGE;
     hdItem.iImage = imageIndex;
     SendMessage(hwndHeader, HDM_SETITEM, new IntPtr(0), new IntPtr(&hdItem));
}