在找到答案之前，我花了最后2或3天在Google上尝试不同的问题表单，试着让它发挥作用。
我需要获取当前打印作业的颜色设置，以确定用户执行了多少彩色或灰度打印。但是我试图访问的每一个颜色属性（通过ManagementObjectSearcher，“Watcher和C＃的内置打印机类”）总是返回颜色，而不是灰度。
任何帮助将不胜感激，因为我已经停止在解决方案上取得进展。谢谢。下面是我的代码（请记住它是我的原型代码，所以除了我要问的问题之外可能还有很多问题。请仅提供您对我的问题的答案的建议。）
using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Printing;
using System.Management;
using System.Management.Instrumentation;
using System.Threading;
using System.Windows.Threading;
using System.Diagnostics;
namespace PrintPlus {
public partial class PrintPlus : Form {
#region Objects
// Mgmt
ManagementEventWatcher watcher;
ManagementObjectSearcher searcher;
// Thread
Thread jobCheck;
// Printer Objects
PrintQueue printQ;
PrintJobInfoCollection printJobCollection;
// Timer
private System.Windows.Forms.Timer timeLogged;
#endregion
#region Paths And Names
string localMachineName;
#endregion
#region Costs
private decimal timeCost;
private decimal printCost;
#endregion
#region Print Variables
private int color;
private bool jobIsProcessing;
private int numberOfPrints;
private int colorPrints;
private int greyScalePrints;
private int printJobCount;
#endregion
#region Time Variables
private float tSecs;
private float tMins;
private float tHrs;
#endregion
#region Constructor
public PrintPlus() {
InitializeComponent();
initObjects();
/* searcher = new ManagementObjectSearcher("SELECT * FROM Win32_PrintJob");
watcher = new ManagementEventWatcher("SELECT * FROM __InstanceCreationEvent WITHIN 0.01 WHERE TargetInstance ISA \"Win32_PrintJob\"");
watcher.EventArrived += new EventArrivedEventHandler(getColorSetting);
watcher.Start();
localMachineName = Environment.MachineName;*/
}
#endregion
#region Initializers
private void initObjects() {
initPrinterObjects();
initTimer();
}
private void initPrinterObjects() {
LocalPrintServer lps = new LocalPrintServer();
printQ = new PrintQueue(lps, lps.DefaultPrintQueue.Name);
}
private void initTimer() {
timeLogged = new System.Windows.Forms.Timer();
timeLogged.Interval = 1000;
timeLogged.Tick += new EventHandler(onTick);
timeLogged.Start();
}
#endregion
#region Delegates
private void onTick(object sender, EventArgs e) {
updateTime();
updateInfo();
}
private void onMove(object sender, EventArgs e) {
this.Location = initialPosition;
}
private void onLoseFocus(object sender, EventArgs e) {
this.MinimizeBox = true;
}
#endregion
#region Updates
private void updateInfo() {
printJobCount = printQ.GetPrintJobInfoCollection().Count<PrintSystemJobInfo>();
if (printJobCount >= 1 && !jobIsProcessing) {
jobIsProcessing = true;
jobCheck = new Thread(new ThreadStart(processJobs));
jobCheck.Start();
}
numberOfPrints = (colorPrints + greyScalePrints);
timeCostLbl.Text = "Time: $" + timeCost.ToString();
printCostLbl.Text = "Print: $" + printCost.ToString();
totalCostLbl.Text = "Total: $" + (timeCost + printCost).ToString();
printedPagesLbl.Text = "Printed Pages: " + numberOfPrints.ToString() + " Colour: " + colorPrints.ToString() + " B&W: " + greyScalePrints.ToString();
}
private void updateTime() {
tSecs += timeLogged.Interval / 1000;
if (tSecs == 60) {
timeCost += FEES.COST_PER_MIN;
tMins += 1;
if (tMins == 60) {
tHrs += 1;
}
tSecs = 0;
}
int i = 0;
String hrs = ((tHrs >= 10) ? tHrs.ToString() : i + tHrs.ToString());
String mins = ((tMins >= 10) ? tMins.ToString() : i + tMins.ToString());
String secs = ((tSecs >= 10) ? tSecs.ToString() : i + tSecs.ToString());
this.timeElapsedLbl.Text = "Time Logged: " + hrs + " : " + mins + " : " + secs;
}
public void processJobs() {
LocalPrintServer lps = new LocalPrintServer();
PrintQueue printQ = new PrintQueue(lps, lps.DefaultPrintQueue.Name);
PrintJobInfoCollection printJobCollection = printQ.GetPrintJobInfoCollection();
PrintSystemJobInfo[] jobArray = printJobCollection.ToArray<PrintSystemJobInfo>();
ManagementObjectSearcher searcher = new ManagementObjectSearcher("SELECT * FROM Win32_PrintJob");
ManagementObjectCollection searchCollection = searcher.Get();
foreach (ManagementObject job in searchCollection) {
foreach (PropertyData prop in job.Properties) {
Debug.WriteLine(prop.Name + ": " + prop.Value);
}
}
try {
for (int i = 0; i < jobArray.Length; ++i) {
if (jobArray[i].PositionInPrintQueue == 1) {
while (jobArray[i].JobStatus != PrintJobStatus.Deleted) {
jobArray[i].Refresh();
}
}
Debug.WriteLine(printQ.CurrentJobSettings.CurrentPrintTicket.OutputColor.Value);
/*if (jobArray[i].PropertiesCollection. == "Color") {
colorPrints += jobArray[i].NumberOfPagesPrinted;
}
else if (jobArray[i].PropertiesCollection["Color"].ToString() == "Monochrome") {
greyScalePrints += jobArray[i].NumberOfPagesPrinted;
}*/
}
}
finally {
jobIsProcessing = false;
lps.Dispose();
printQ.Dispose();
printJobCollection.Dispose();
jobCheck.Abort();
}
}
private void getPrintWatcher(int jobID) {
}
private void getColorSetting(object sender, EventArrivedEventArgs e) {
/* foreach (PropertyData data in e.NewEvent.Properties) {
ManagementBaseObject mbo = data.Value as ManagementBaseObject;
if (mbo.Properties["Color"].Value == "Color") {
color = COLOR_VALUES.COLOR;
}
else if (mbo.Properties["Color"].Value == "Monochrome") {
color = COLOR_VALUES.MONO;
}
}*/
}
#endregion
}
}
答案 0 :(得分：0)
我相信您遇到的问题是因为打印机能够以彩色和黑白打印。当您通过彩色打印机打印黑色字母文本文档时，WIN32_PrintJob仍然会说文档是彩色文档，除非您明确告诉打印机通过本地计算机的“打印机首选项”对话框以黑白打印。
答案 1 :(得分：0)
每个打印机制造商和型号的颜色计数器的工作方式不同。您最好的选择是在处理打印之前，浏览打印材料并确定彩页和黑页。如果不是，您必须在仅适用于多功能打印机的机器计数器上进行中继，您可以通过SNMP获取此信息。
答案 2 :(得分：0)
我花了很多时间来权衡如何获得定义的彩色打印的真正价值，并发现Win32_PrintJob以这种方式提供这些信息：
public static bool PausePrintJob(string printerName, int printJobID)
{
bool isActionPerformed = false;
string searchQuery = "SELECT * FROM Win32_PrintJob";
ManagementObjectSearcher searchPrintJobs = new ManagementObjectSearcher(searchQuery);
ManagementObjectCollection prntJobCollection = searchPrintJobs.Get();
foreach (ManagementObject prntJob in prntJobCollection)
{
System.String jobName = prntJob.Properties["Name"].Value.ToString();
//Job name would be of the format [Printer name], [Job ID]
char[] splitArr = new char[1];
splitArr[0] = Convert.ToChar(",");
string prnterName = jobName.Split(splitArr)[0];
int prntJobID = Convert.ToInt32(jobName.Split(splitArr)[1]);
string documentName = prntJob.Properties["Document"].Value.ToString();
if (String.Compare(prnterName, printerName, true) == 0)
{
if (prntJobID == printJobID)
{
// MessageBox.Show("PAGINAS : " + prntJob.Properties["TotalPages"].Value.ToString() + documentName + " " + prntJobID);
prntJob.InvokeMethod("Pause", null);
MessageBox.Show(prntJob.Properties["Color"].Value.ToString());
//prntJob.InvokeMethod("Resume", null);
isActionPerformed = true;
break;
}
}
}
return isActionPerformed;
}