回答編集履歴
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解決方法の入力
answer
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@@ -1,1 +1,8 @@
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一行目を下記のように変更すると正しく取得できるようになりました。
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```vb
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<StructLayout(LayoutKind.Sequential)> _
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```
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↓
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```vb
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<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Auto)> _
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```
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1
質問の変更
answer
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@@ -1,59 +1,1 @@
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動くコードに変更しました
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```vb
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<StructLayout(LayoutKind.Sequential)> _
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Public Structure DEVMODE
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Public Const CCHDEVICENAME As Integer = 32
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Public Const CCHFORMNAME As Integer = 32
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<MarshalAs(UnmanagedType.ByValTStr, SizeConst:=CCHDEVICENAME)> _
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Public dmDeviceName As String
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Public dmSpecVersion As Short
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Public dmDriverVersion As Short
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Public dmSize As Short
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Public dmDriverExtra As Short
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Public dmFields As Integer
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Public dmOrientation As Short
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Public dmPaperSize As Short
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Public dmPaperLength As Short
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Public dmPaperWidth As Short
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Public dmScale As Short
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Public dmCopies As Short
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Public dmDefaultSource As Short
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Public dmPrintQuality As Short
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Public dmColor As Short
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Public dmDuplex As Short
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Public dmYResolution As Short
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Public dmTTOption As Short
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Public dmCollate As Short
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<MarshalAs(UnmanagedType.ByValTStr, SizeConst:=CCHFORMNAME)> _
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Public dmFormName As String
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Public dmLogPixels As Short
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Public dmBitsPerPel As Integer
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Public dmPelsWidth As Integer
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Public dmPelsHeight As Integer
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Public dmDisplayFlags As Integer
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Public dmDisplayFrequency As Integer
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Public dmICMMethod As Integer
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Public dmICMIntent As Integer
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Public dmMediaType As Integer
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Public dmDitherType As Integer
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Public dmReserved1 As Integer
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Public dmReserved2 As Integer
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Public dmPanningWidth As Integer
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Public dmPanningHeight As Integer
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Public dmPositionX As Integer
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Public dmPositionY As Integer
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End Structure
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Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
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PrintDocument1.PrinterSettings.PrinterName = "Microsoft Print to PDF"
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Dim devmodePtr As IntPtr = PrintDocument1.PrinterSettings.GetHdevmode()
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Dim dm As DEVMODE = CType(Marshal.PtrToStructure(devmodePtr, GetType(DEVMODE)), DEVMODE)
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GlobalFree(devmodePtr)
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End Sub
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```
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