[英]How I can get printer name from device and printers IShellFolder?
我正在使用代码获取系统打印机图标(我发现的唯一方法是使用IShellFolder),现在我想将它们与InstalledPrinters连接起来,但是问题是-我找不到方法来找到真实的打印机名称(例如“ \\ ServerName \\ PrinterName“),与“设备和打印机”外壳文件夹的内容的显示名称不同,仅适用于PrinterSettings。
我用于检索“设备和打印机”外壳文件夹中的打印机图标和打印机标题的代码:
Shell32.IShellFolder iDesktopFolder = Shell32.GetDesktopFolder();
try
{
IntPtr pidlPrintersFolder;
if (Shell32.SHGetFolderLocation(_hwndOwner, (int)Shell32.CSIDL.CSIDL_PRINTERS, IntPtr.Zero, 0, out pidlPrintersFolder) == 0)
try
{
StringBuilder strDisplay = new StringBuilder(260);
Guid guidIShellFolder = Shell32.IID_IShellFolder;
IntPtr ptrPrintersShellFolder;
iDesktopFolder.BindToObject(pidlPrintersFolder, IntPtr.Zero, ref guidIShellFolder, out ptrPrintersShellFolder);
Object objPrintersShellFolder = Marshal.GetTypedObjectForIUnknown(ptrPrintersShellFolder, Shell32.ShellFolderType);
try
{
Shell32.IShellFolder printersShellFolder = (Shell32.IShellFolder)objPrintersShellFolder;
IntPtr ptrObjectsList;
printersShellFolder.EnumObjects(_hwndOwner, Shell32.ESHCONTF.SHCONTF_NONFOLDERS, out ptrObjectsList);
Object objEnumIDList = Marshal.GetTypedObjectForIUnknown(ptrObjectsList, Shell32.EnumIDListType);
try
{
Shell32.IEnumIDList iEnumIDList = (Shell32.IEnumIDList)objEnumIDList;
IntPtr[] rgelt = new IntPtr[1];
IntPtr pidlPrinter;
int pceltFetched;
Shell32.STRRET ptrString;
while (iEnumIDList.Next(1, rgelt, out pceltFetched) == 0 && pceltFetched == 1)
{
printersShellFolder.GetDisplayNameOf(rgelt[0],
Shell32.ESHGDN.SHGDN_NORMAL, out ptrString);
if (Shell32.StrRetToBuf(ref ptrString, rgelt[0], strDisplay,
(uint)strDisplay.Capacity) == 0)
{
pidlPrinter = Shell32.ILCombine(pidlPrintersFolder, rgelt[0]);
string printerDisplayName = strDisplay.ToString();
Shell32.SHFILEINFO shinfo = new Shell32.SHFILEINFO();
Shell32.SHGetFileInfo(this._pidl, 0, out shinfo, (uint)Marshal.SizeOf(shinfo), Shell32.SHGFI.PIDL | Shell32.SHGFI.AddOverlays | Shell32.SHGFI.Icon);
Icon printerIcon = (Icon)Icon.FromHandle(shinfo.hIcon).Clone();
Shell32.DestroyIcon(shinfo.hIcon);
// HOW TO GET PRINTER NAME (\\ServerName\printername) WITH IS DIFFERENT FROM A PRINTER NAME IN "DEVICES AND PRINTERS" SYSTEM FOLDER
}
}
}
finally
{
Marshal.ReleaseComObject(objEnumIDList);
}
}
finally
{
Marshal.ReleaseComObject(objPrintersShellFolder);
}
}
finally
{
Shell32.ILFree(pidlPrintersFolder);
}
}
finally
{
Marshal.ReleaseComObject(iDesktopFolder);
}
谢谢你的帮助。
自己找到答案。
要枚举IShellFolder中的打印机,我们必须使用IShellFolder.ParseDisplayName方法(而不是EnumObjects),并将打印机名称从PrinterSettings.IntalledPrinters(例如对于网络打印机的“ \\ ServerName \\ PrinterName”)发送到IShellFolder.ParseDisplayName参数pszDisplayName,IShellFolder“设备和打印机”很好地工作。
因此,在此之后,我们可以枚举实际的打印机名称(“ \\ ServerName \\ PrinterName”),打印机显示名称(“在设备和打印机”中列出的打印机的“ ServerName上的打印机名称”)和打印机图标。
经过一些编辑后,我将在此处发布完整代码以供父亲搜索。
在循环中,可以使用当前rgelt[0]
上的IID_IDataObject
printersShellFolder.GetUIObjectOf
,并使用剪贴板"PrinterFriendlyName"
调用IDataObject::GetData
以获取真实的打印机名称(以STGMEDIUM
编码)。
您也可以在当前pidl上为IID_IQueryInfo
使用printersShellFolder.GetUIObjectOf
来获取打印机状态。
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