vb 驱动打印机(VB程序实现打印机驱动 – 新标题：VB程序实现打印机驱动的方法)

VB程序实现打印机驱动的方法

打印机作为一种常见的输出设备，是我们在日常生活和工作中经常会用到的设备。在应用程序中，为了实现打印功能，我们需要选择并安装合适的打印机驱动，从而与打印机进行通信并输出打印结果。但是，在某些特定的需求场景下，我们可能需要自己编写一个打印机驱动程序，以满足个性化的打印需求。在本文中，我们将介绍如何使用VB语言编写打印机驱动，以实现自定义的打印功能。

建立VB项目

在开始编写VB打印机驱动程序之前，我们需要先建立一个VB项目，并引入相关的打印机接口库。具体步骤如下：

打开VB集成开发环境，新建一个标准EXE项目。

在工具箱中选择“组件”，然后选中“Microsoft Common Dialog Control 6.0”和“Microsoft Windows Common Controls 6.0”两个控件，点击确定按钮进行引入。

在VB代码中添加以下引用语句：

    Private Declare Function OpenPrinter Lib "winspool.drv" Alias "OpenPrinterA" _

    (ByVal lpPrinterName As String, _
     phPrinter As Long, _
     ByVal lpPrintServer As Long) As Long
     
    Private Declare Function ClosePrinter Lib "winspool.drv" (ByVal hPrinter As Long) As Long
     
    Private Declare Function StartDocPrinter Lib "winspool.drv" Alias "StartDocPrinterA" _
    (ByVal hPrinter As Long, _
     ByVal Level As Long, _
     pDocInfo As DOCINFO) As Long
     
    Private Declare Function EndDocPrinter Lib "winspool.drv" (ByVal hPrinter As Long) As Long
     
    Private Declare Function StartPagePrinter Lib "winspool.drv" (ByVal hPrinter As Long) As Long
     
    Private Declare Function EndPagePrinter Lib "winspool.drv" (ByVal hPrinter As Long) As Long
     
    Private Type DOCINFO
         pDocName As String
         pOutputFile As String
         pDatatype As String
         dCreationTime As Long
         dLastAccessTime As Long
         dLastWriteTime As Long
         cbSize As Long
    End Type
      
    Private Declare Function WritePrinter Lib "winspool.drv" _
    (ByVal hPrinter As Long, _
     pBuf As Any, _
     ByVal cbBuf As Long, _
     pcbWritten As Long) As Long

编写打印功能

建立VB项目和引入打印机接口库之后，我们就可以开始编写打印功能了。在VB代码中，我们可以使用以下方法实现打印任务：

打开打印机

开始新的打印任务

开始新的打印页

输出打印内容

结束打印页

结束打印任务

关闭打印机

具体的实现方法如下：

    Private Sub PrintDocumentContent(sPrinterName As String, sDocumentTitle As String, sContentText As String)

      Dim hPrinter As Long
      Dim pd As DOCINFO
      
      pd.pDocName = sDocumentTitle
      pd.pDatatype = "RAW"
      pd.cbSize = Len(pd)
      
      If OpenPrinter(sPrinterName, hPrinter, 0) = 0 Then
        Exit Sub
      End If
      
      If StartDocPrinter(hPrinter, 1, pd) = 0 Then
        ClosePrinter (hPrinter)
        Exit Sub
      End If
      
      If StartPagePrinter(hPrinter) = 0 Then
        EndDocPrinter hPrinter
        ClosePrinter hPrinter
        Exit Sub
      End If
      
      WritePrinter hPrinter, sContentText, Len(sContentText), Count
      
      EndPagePrinter hPrinter
      EndDocPrinter hPrinter
      ClosePrinter hPrinter
      
      MsgBox "打印成功！", vbInformation
      
    End Sub

实现自定义格式打印

通过以上方法，我们可以实现基本的打印功能。如果需要实现更加个性化的打印格式，可以通过在打印函数中添加自定义的打印规则来实现。

例如，我们可以在输出打印内容之前，通过指定字体、字号、颜色等属性，自定义打印文本的格式。具体实现代码如下：

    Private Sub PrintDocumentContent(sPrinterName As String, sDocumentTitle As String, sContentText As String, _

                                    Optional sFontName As String = "宋体", _
                                    Optional lFontSize As Long = 12, _
                                    Optional lFontWeight As Long = 600, _
                                    Optional lFontColor As Long = vbBlack)
      Dim hPrinter As Long
      Dim pd As DOCINFO
      
      pd.pDocName = sDocumentTitle
      pd.pDatatype = "RAW"
      pd.cbSize = Len(pd)
      
      If OpenPrinter(sPrinterName, hPrinter, 0) = 0 Then
        Exit Sub
      End If
      
      If StartDocPrinter(hPrinter, 1, pd) = 0 Then
        ClosePrinter (hPrinter)
        Exit Sub
      End If
      
      If StartPagePrinter(hPrinter) = 0 Then
        EndDocPrinter hPrinter
        ClosePrinter hPrinter
        Exit Sub
      End If
      
      Printer.Font.Name = sFontName
      Printer.Font.Size = lFontSize
      Printer.Font.Bold = lFontWeight
      Printer.ForeColor = lFontColor
      
      Printer.Print sContentText
      
      EndPagePrinter hPrinter
      EndDocPrinter hPrinter
      ClosePrinter hPrinter
      
      MsgBox "打印成功！", vbInformation
      
    End Sub

通过在打印函数中添加自定义的打印规则，我们就可以实现自定义格式打印，满足不同的个性化打印需求。

总结

本文介绍了如何使用VB语言编写打印机驱动，以实现自定义的打印功能。通过建立VB项目、引入打印机接口库，并编写打印函数，我们可以实现基本的打印功能。如果需要实现更加个性化的打印格式，可以在打印函数中添加自定义的打印规则，满足不同的个性化打印需求。