Dllcall autoit 部分获得结果

Question

我在 autoit 中遇到以下代码问题。

假设列出我系统中可用的所有打印机以及每台打印机支持的相应纸张名称。

但我只得到打印机名称和一系列“0”，这应该是纸张名称

#include <Debug.au3>
#include <String.au3>
Const $DC_BINS = 6
Const $DC_BINNAMES = 12
Const $DC_PAPERNAMES = 16
Const $DC_PAPERS = 2
Const $DC_PAPERSIZE = 3
Dim $BinNameList
$objWMIService = ObjGet("winmgmts:{impersonationLevel=impersonate}!\\.\root\cimv2")
$colInstalledPrinters = $objWMIService.ExecQuery ("Select Name, PortName from Win32_Printer")
For $objPrinter In $colInstalledPrinters
    $result = DllCall("winspool.drv", "long", "DeviceCapabilitiesA", "str", $objPrinter.Name, "str", $objPrinter.PortName, "int", $DC_PAPERS, "str", Chr(0), "long", 0)
    $s_struct = ""
_DebugSetup ($s_struct)
    $s_struct=_StringRepeat("0", $result[0]*64)
    ;$s_struct = StringTrimRight($s_struct, 1)
    $struct = DllStructCreate($s_struct)
    $result2 = DllCall("winspool.drv", "long", "DeviceCapabilitiesA", "str", $objPrinter.Name, "str", $objPrinter.PortName, "int", $DC_PAPERNAMES, "ptr", DllStructGetPtr($struct), "long", 0)
    _DebugOut ( $objPrinter.Name) 
    For $i = 0 To $result[0]-1
        _DebugOut (DllStructGetData($struct, $i)) 
    Next
    $struct = 0
Next

Answer 1

看看这个：http://msdn.microsoft.com/en-us/library/aa394363(v=vs.85).aspx

仅使用 WMI 的示例：

#include <Array.au3>

$objWMIService = ObjGet("winmgmts:{impersonationLevel=impersonate}!\\.\root\cimv2")
$colInstalledPrinters = $objWMIService.ExecQuery ("Select * from Win32_Printer",Default,48)
For $objPrinter In $colInstalledPrinters
    $arr = $objPrinter.PrinterPaperNames
    _ArrayDisplay($arr, $objPrinter.Name)
Next

或者试试这个打印实际的论文名称（在 SciTE 中运行，这样你就可以看到 ConsoleWrite 的输出）：

Const $DC_PAPERS = 2
Const $DC_PAPERSIZE = 3
Const $DC_PAPERNAMES = 16

$objWMIService = ObjGet("winmgmts:{impersonationLevel=impersonate}!\\.\root\cimv2")
$colInstalledPrinters = $objWMIService.ExecQuery ("Select Name, PortName from Win32_Printer")

For $objPrinter In $colInstalledPrinters
    $result = DllCall("winspool.drv", "long", "DeviceCapabilitiesA", "str", $objPrinter.Name, "str", $objPrinter.PortName, "int", $DC_PAPERS, "str", Chr(0), "long", 0)

    $s_struct = ""
    $s_struct2 = ""

    For $i = 1 To $result[0]
        $s_struct = $s_struct & "char[64];"
    Next

    For $i = 1 To $result[0]
        $s_struct2 &= "long x;long y;"
    Next

    $s_struct = StringTrimRight($s_struct, 1)
    $s_struct2 = StringTrimRight($s_struct2, 1)
    $j = 1

    $struct = DllStructCreate($s_struct)
    $pointStruct = DllStructCreate($s_struct2)

    $result2 = DllCall("winspool.drv", "long", "DeviceCapabilitiesA", "str", $objPrinter.Name, "str", $objPrinter.PortName, "int", $DC_PAPERNAMES, "ptr", DllStructGetPtr($struct), "long", 0)
    $result3 = DllCall("winspool.drv", "long", "DeviceCapabilitiesA", "str", $objPrinter.Name, "str", $objPrinter.PortName, "int", $DC_PAPERSIZE, "ptr", DllStructGetPtr($pointStruct), "long", 0)

    ConsoleWrite($objPrinter.Name & " on Port: " & $objPrinter.PortName & @CRLF)
    For $i = 1 To $result[0]
        ConsoleWrite(DllStructGetData($struct, $i) & " (" & DllStructGetData($pointStruct, $j) & "mm x " & DllStructGetData($pointStruct, $j + 1) & "mm)" & @CRLF)
        $j += 2
    Next

    $struct = 0
    $pointStruct = 0
Next