#region 輔助定義
//印表機狀態
[flagsattribute]
internal enum printerstatus
;[structlayout(layoutkind.sequential, charset = charset.auto)]
internal struct structprinterdefaults
;//nested types
[structlayout(layoutkind.sequential)]
public class docinfoa
[structlayout(layoutkind.sequential)]
internal struct printer_info_2
#endregion
///
/// 印表機狀態
///
public enum eprinterstate
///
/// 列印的檔案型別
///
public enum eprintfiletype
///
/// 列印類
/// 使用方法:
/// getprinterlist 獲取所有可用印表機名稱列表
/// checkprintervalid 檢查某個印表機是否可用.
/// getprinterstatus 獲取印表機狀態
/// printfile 使用指定印表機列印檔案.
/// printfilebysystem 使用指定印表機列印檔案,呼叫作業系統預設程式列印
///
public class printerhelper
}return false;
}///
/// 獲取本機安裝的所有印表機
///
///
public static listgetprinterlist()
foreach (string printername in printersettings.installedprinters)
return ret;
}///
/// 檢查印表機是否可用
///
///
///
public static boolean checkprintervalid(string printername)
eprinterstate state = getprinterstatus(printername);
if (state == eprinterstate.ready || state == eprinterstate.busy)
return false;
}///
/// 獲取印表機狀態
///
///
///
public static eprinterstate getprinterstatus(string printername)
#endregion
#region 內部實現
///
/// 列印word
///
///
///
///
private static boolean printword(string printername, string filename)
#endregion
#region 系統api
// [methods]
[dllimport("winspool.drv", callingconvention = callingconvention.stdcall, setlasterror = true, exactspelling = true)]
internal static extern bool closeprinter(intptr hprinter);
[dllimport("winspool.drv", callingconvention = callingconvention.stdcall, setlasterror = true, exactspelling = true)]
internal static extern bool enddocprinter(intptr hprinter);
[dllimport("winspool.drv", callingconvention = callingconvention.stdcall, setlasterror = true, exactspelling = true)]
internal static extern bool endpageprinter(intptr hprinter);
[dllimport("winspool.drv", entrypoint = "openprintera", callingconvention = callingconvention.stdcall, charset = charset.ansi, setlasterror = true, exactspelling = true)]
internal static extern bool openprinter([marshalas(unmanagedtype.lpstr)] string szprinter, out intptr hprinter, intptr pd);
[dllimport("winspool.drv", entrypoint = "getprintera", callingconvention = callingconvention.stdcall, charset = charset.ansi, setlasterror = true, exactspelling = true)]
internal static extern bool getprinter(intptr hprinter, int dwlevel, intptr pprinter, int dwbuf, out int dwneeded);
[dllimport("winspool.drv", entrypoint = "startdocprintera", callingconvention = callingconvention.stdcall, charset = charset.ansi, setlasterror = true, exactspelling = true)]
internal static extern bool startdocprinter(intptr hprinter, int level, [in, marshalas(unmanagedtype.lpstruct)] docinfoa di);
[dllimport("winspool.drv", callingconvention = callingconvention.stdcall, setlasterror = true, exactspelling = true)]
internal static extern bool startpageprinter(intptr hprinter);
[dllimport("winspool.drv", callingconvention = callingconvention.stdcall, setlasterror = true, exactspelling = true)]
internal static extern bool writeprinter(intptr hprinter, intptr pbytes, int dwcount, out int dwwritten);
///
/// 獲取印表機狀態字
///
///
///
internal static int getprinterstatusint(string printername)
int cbneeded = 0;
bl = getprinter(hprinter, 2, intptr.zero, 0, out cbneeded);
//此處不能判斷bl.應該只判斷 cbneeded
if (cbneeded < 1)
intptr paddr = marshal.allochglobal((int)cbneeded);
bl = getprinter(hprinter, 2, paddr, cbneeded, out cbneeded);
if (!bl)
printer_info_2 info2 = new printer_info_2();
info2 = (printer_info_2)marshal.ptrtostructure(paddr, typeof(printer_info_2));
intret = system.convert.toint32(info2.status);
marshal.freehglobal(paddr);
closeprinter(hprinter);
return intret;
}#endregion
}
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