在c#中,我可以获取运行系统上安装的所有打印机驱动程序列表,就像Windows "添加打印机"向导一样:
我已经能够列出已安装的打印机,但如何列出系统中可用的驱动程序?
我已经能够列出已安装的打印机,但如何列出系统中可用的驱动程序?
这段代码枚举了安装的打印机驱动程序:
public struct DRIVER_INFO_2
{
public uint cVersion;
[MarshalAs(UnmanagedType.LPTStr)] public string pName;
[MarshalAs(UnmanagedType.LPTStr)] public string pEnvironment;
[MarshalAs(UnmanagedType.LPTStr)] public string pDriverPath;
[MarshalAs(UnmanagedType.LPTStr)] public string pDataFile;
[MarshalAs(UnmanagedType.LPTStr)] public string pConfigFile;
}
public static class EnumeratePrinterDriverNames
{
[DllImport("winspool.drv", CharSet = CharSet.Auto, SetLastError = true)]
private static extern int EnumPrinterDrivers(String pName, String pEnvironment, uint level, IntPtr pDriverInfo,
uint cdBuf, ref uint pcbNeeded, ref uint pcRetruned);
public static IEnumerable<string> Enumerate()
{
const int ERROR_INSUFFICIENT_BUFFER = 122;
uint needed = 0;
uint returned = 0;
if (EnumPrinterDrivers(null, null, 2, IntPtr.Zero, 0, ref needed, ref returned) != 0)
{
//succeeds, but shouldn't, because buffer is zero (too small)!
throw new ApplicationException("EnumPrinters should fail!");
}
int lastWin32Error = Marshal.GetLastWin32Error();
if (lastWin32Error != ERROR_INSUFFICIENT_BUFFER)
{
throw new Win32Exception(lastWin32Error);
}
IntPtr address = Marshal.AllocHGlobal((IntPtr) needed);
try
{
if (EnumPrinterDrivers(null, null, 2, address, needed, ref needed, ref returned) == 0)
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
var type = typeof (DRIVER_INFO_2);
IntPtr offset = address;
int increment = Marshal.SizeOf(type);
for (uint i = 0; i < returned; i++)
{
var di = (DRIVER_INFO_2) Marshal.PtrToStructure(offset, type);
offset += increment;
yield return di.pName;
}
}
finally
{
Marshal.FreeHGlobal(address);
}
}
}