在用.net做pocket pc的程序中，我们经常想使用系统的Imagelist来和listview或treeview捆绑来显示不同后缀文件的不同图标。
但在.net编程中对系统的Imagelist的读取比较麻烦，我们需要借助api来实现。主要的办法是P/Invoke.
但在.net编程中对系统的Imagelist的读取比较麻烦，我们需要借助api来实现。主要的办法是P/Invoke.
用sendMessag来改变listview或treeview的IMagelist.
用sendMessag来改变listview或treeview的IMagelist.
public static void SetListViewImageList(
IntPtr hwnd,
ListView listView,
SysImageList sysImageList,
bool forStateImages
)
{
IntPtr wParam = (IntPtr)LVSIL_NORMAL;
if (sysImageList.ImageListSize == SysImageListSize.smallIcons)
{
wParam = (IntPtr)LVSIL_SMALL;
}
if (forStateImages)
{
wParam = (IntPtr)LVSIL_STATE;
}
SendMessage(
hwnd,
LVM_SETIMAGELIST,
wParam,
sysImageList.Handle);
}
public static void SetTreeViewImageList(
IntPtr hwnd,
TreeView treeView,
SysImageList sysImageList,
bool forStateImages
)
{
IntPtr wParam = (IntPtr)TVSIL_NORMAL;
if (forStateImages)
{
wParam = (IntPtr)TVSIL_STATE;
}
SendMessage(
hwnd,
TVM_SETIMAGELIST,
wParam,
sysImageList.Handle);
}
用EVC对“SHgetfileinfo”API函数进行包装，代码如下：
extern "C" __declspec (dllexport) DWORD SHABgetfileinfo(LPCTSTR pszFileName)
{
SHFILEINFO ssfi;
return SHGetFileInfo(pszFileName, 0, &ssfi,
sizeof(SHFILEINFO),
SHGFI_USEFILEATTRIBUTES | SHGFI_SYSICONINDEX | SHGFI_SMALLICON);
}
extern "C" __declspec (dllexport) int SHIndexfileinfo(LPCTSTR pszFileName)
{
SHFILEINFO ssfi;
SHGetFileInfo(pszFileName, 0, &ssfi, sizeof(SHFILEINFO),
SHGFI_SYSICONINDEX | SHGFI_SMALLICON);
return ssfi.iIcon;
}
extern "C" __declspec (dllexport) int SHIndexfileinfoEx(LPCTSTR pszFileName,DWORD dwAttr, UINT dwFlag)
{
SHFILEINFO ssfi;
SHGetFileInfo(pszFileName, 0, &ssfi, sizeof(SHFILEINFO),
dwFlag);
return ssfi.iIcon;
}
在需要使用系统imagelist的地方作如下的调用：
sysilsSmall = new SysImageList(SysImageListSize.smallIcons);
this .tvFolders.Capture = true ;
IntPtr hwnd1 = GetCapture();
this .tvFolders.Capture = false ;
this .lvFiles.Capture = true ;
IntPtr hwnd2 = GetCapture();
SysImageListHelper.SetTreeViewImageList(
hwnd1,
tvFolders,
sysilsSmall,
false );
SysImageListHelper.SetListViewImageList(
hwnd2,
lvFiles,
sysilsSmall,
false );
this .lvFiles.Capture = false ;
窗体实现分割功能，主要是处理鼠标的down, move, up实践来完成不同部分的分割，这个对于pocket pc这样的屏幕限制系统来说相当有趣。
private void FileExplorer_MouseDown( object sender, System.Windows.Forms.MouseEventArgs e)
{
this .picSplitter.Top=e.Y-4;
this .picSplitter.Visible= true ;
this .Moving= true ;
}
private void FileExplorer_MouseMove( object sender, System.Windows.Forms.MouseEventArgs e)
{
if ( this .Moving)
{
this .picSplitter.Top=e.Y;
}
}
private void FileExplorer_MouseUp( object sender, System.Windows.Forms.MouseEventArgs e)
{
this .tvFolders.Height=e.Y-5;
this .lvFiles.Top= this .tvFolders.Top+ this .tvFolders.Height+10;
this .lvFiles.Height= this .Height- this .lvFiles.Top;
this .picSplitter.Visible= false ;
this .Moving= false ;
this .ModeChange= false ;
}
按照不同的列标头来排序：
按照不同的列标头来排序：
private void Sort( ref ArrayList AL, string SortBy, bool Asc)
{
IComparer myComparer= null ;
switch (SortBy)
{
case "Name":
if (Asc)
myComparer= new SortNameAsc();
else
myComparer= new SortNameDesc();
break ;
case "Size":
if (Asc)
myComparer= new SortSizeAsc();
else
myComparer= new SortSizeDesc();
break ;
case "Type":
if (Asc)
myComparer= new SortTypeAsc();
else
myComparer= new SortTypeDesc();
break ;
case "Modified":
if (Asc)
myComparer= new SortModifiedAsc();
else
myComparer= new SortModifiedDesc();
break ;
}
AL.Sort(myComparer);
}
public class SortNameDesc : IComparer
{
int IComparer.Compare( Object x, Object y )
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