函数参考

_GDIPlus_EncodersGetParamListSize

获取图像编码器参数列表的大小

#Include <GDIPlus.au3>
_GDIPlus_EncodersGetParamListSize($hImage, $sEncoder)

参数

返回值

注意/说明

相关

详情参考

在MSDN中搜索

示例/演示

#include <GUIConstantsEx.au3>
#include <GDIPlus.au3>
#include <ScreenCapture.au3>
#include <WindowsConstants.au3>

Global $iMemo, $aEncoder, $hImage

_Main()

Func _Main()
    Local $hBitmap

    ; 创建 GUI
    GUICreate("GDI+", 600, 400)
    $iMemo = GUICtrlCreateEdit("", 2, 2, 596, 396, $WS_VSCROLL)
    GUICtrlSetFont($iMemo, 9, 400, 0, "Courier New")
    GUISetState()

    ; 初始化 GDI+ 库
    _GDIPlus_Startup()

    ; 创建用于特征列表的图像
    $hBitmap = _ScreenCapture_Capture("", 0, 0, 1, 1)
    $hImage = _GDIPlus_BitmapCreateFromHBITMAP($hBitmap)

    ; 显示编码器特征
    $aEncoder = _GDIPlus_Encoders()
    ShowEncoder("Encoder")

    ; 显示解码器特征
    $aEncoder = _GDIPlus_Decoders()
    ShowEncoder("Decoder")

    ; 清理资源
    _GDIPlus_ImageDispose($hImage)
    _WinAPI_DeleteObject($hBitmap)

    ; 关闭 GDI+ 库
    _GDIPlus_Shutdown()

    ; 循环直到用户退出
    Do
    Until GUIGetMsg() = $GUI_EVENT_CLOSE
EndFunc   ;==>_Main

; 写入一行到 memo 控件
Func MemoWrite($sMessage = '')
    GUICtrlSetData($iMemo, $sMessage & @CRLF, 1)
EndFunc   ;==>MemoWrite

; 显示编码器信息
Func ShowEncoder($sTitle)
    Local $iI, $iJ, $iK, $sCLSID, $tData, $tParam, $tParams

    For $iI = 1 To $aEncoder[0][0]
        $sCLSID = _GDIPlus_EncodersGetCLSID($aEncoder[$iI][5])
        MemoWrite("Image " & $sTitle & " " & $iI)
        MemoWrite("  Codec GUID ............: " & $aEncoder[$iI][1])
        MemoWrite("  File format GUID ......: " & $aEncoder[$iI][2])
        MemoWrite("  Codec name ............: " & $aEncoder[$iI][3])
        MemoWrite("  Codec Dll file name ...: " & $aEncoder[$iI][4])
        MemoWrite("  Codec file format .....: " & $aEncoder[$iI][5])
        MemoWrite("  File name extensions ..: " & $aEncoder[$iI][6])
        MemoWrite("  Mime type .............: " & $aEncoder[$iI][7])
        MemoWrite("  Flags .................: 0x" & Hex($aEncoder[$iI][8]))
        MemoWrite("  Version ...............: " & $aEncoder[$iI][9])
        MemoWrite("  Signature count .......: " & $aEncoder[$iI][10])
        MemoWrite("  Signature size ........: " & $aEncoder[$iI][11])
        MemoWrite("  Signature pattern ptr .: 0x" & Hex($aEncoder[$iI][12]))
        MemoWrite("  Signature mask ptr ....: 0x" & Hex($aEncoder[$iI][13]))
        MemoWrite("  Paramater list size ...: " & _GDIPlus_EncodersGetParamListSize($hImage, $sCLSID))
        MemoWrite()

        $tParams = _GDIPlus_EncodersGetParamList($hImage, $sCLSID)
        If @error Then ContinueLoop

        For $iJ = 0 To DllStructGetData($tParams, "Count") - 1
            MemoWrite("  Image " & $sTitle & " Parameter " & $iJ)
            $tParam = DllStructCreate($tagGDIPENCODERPARAM, DllStructGetPtr($tParams, "Params") + ($iJ * 28))
            MemoWrite("    Parameter GUID ......: " & _WinAPI_StringFromGUID(DllStructGetPtr($tParam, "GUID")))
            MemoWrite("    Number of values ....: " & DllStructGetData($tParam, "Count"))
            MemoWrite("    Parameter type.......: " & DllStructGetData($tParam, "Type"))
            MemoWrite("    Parameter pointer ...: 0x" & Hex(DllStructGetData($tParam, "Values")))
            Switch DllStructGetData($tParam, "Type")
                Case 4
                    $tData = DllStructCreate("int Data[" & DllStructGetData($tParam, "Count") & "]", DllStructGetData($tParam, "Values"))
                    For $iK = 1 To DllStructGetData($tParam, "Count")
                        MemoWrite("      Value .............: " & DllStructGetData($tData, 1, $iK))
                    Next
                Case 6
                    $tData = DllStructCreate("int Low;int High", DllStructGetData($tParam, "Values"))
                    MemoWrite("      Low range .........: " & DllStructGetData($tData, "Low"))
                    MemoWrite("      High range ........: " & DllStructGetData($tData, "High"))
            EndSwitch
            MemoWrite()
        Next
    Next
EndFunc   ;==>ShowEncoder