从具有后期绑定的COM对象中获取类/类型

Question

我在COM兼容性问题上有问题。这个链接已经非常有用了，COM interface Photoshop compatibility issue解释说，COM兼容性问题可以用后期绑定来解决。我已经尝试过了，但是现在我对如何使用以前通过COM对象访问的类型感到困惑。

原始代码：

//This works with late binding
m_Application = new Photoshop.Application();
var refe = new Photoshop.ActionReference();

refe.PutProperty(m_Application.CharIDToTypeID("Prpr"), m_Application.CharIDToTypeID("NmbL"));

//This is the problem area
var ColorlendMode = Photoshop.PsBlendMode.psColorBlend;

var visibleLayers = new List<Photoshop.ArtLayer>();

后期绑定代码：

//works...
dynamic m_Application = Activator.CreateInstance(Type.GetTypeFromProgID("Photoshop.Application"));
dynamic refe = Activator.CreateInstance(Type.GetTypeFromProgID("Photoshop.ActionReference"));

refe.PutProperty(m_Application.CharIDToTypeID("Prpr"), m_Application.CharIDToTypeID("NmbL"));

//PROBLEM:
//Doesn't compile
Type BlendModeType = Type.GetTypeFromProgID("Photoshop.PsBlendMode").psColorBlend;

//returns null
//Type BlendModeType = Type.GetTypeFromProgID("Photoshop.PsBlendMode");
//Type artLayerType = Type.GetTypeFromProgID("Photoshop.ArtLayer");

编译erorr是：

'System.Type' does not contain a definition for 'psColorBlend'

那么，如何获得我以前使用Photoshop COM对象获得的枚举PsBlendMode (在我的项目中作为引用添加)？

Answer 1

好吧，不同的想法：

只需定义您自己的枚举来表示PSColorBlen并使用它

public enum PsBlendMode
{
    psColorBlend = 22
}

var ColorlendMode = PsBlendMode.psColorBlend;

当您将int传递到调用中时，您可能不得不将其转换为int。

有关常量值的列表，请参见此处：http://fs.mis.kuas.edu.tw/~wchsieh/photoshopy9.py

Answer 2

试试这个代码..。您将获得混合模式名为字符串类型。

 Public Enum EBlendModes
    None = 0
    psSoftLight = 13
    psScreen = 9
    psNormalBlend = 2
    psMultiply = 5
    psColorBurn = 6
    psDissolve = 3
    psHardMix = 26
    psHardLight = 14
    psDarken = 4
    psDifference = 18
    psColorBlend = 22
    psPinLight = 17
    psOverlay = 12
    psVividLight = 15
    psLighterColor = 27
    psLinearLight = 16
    psDarkerColor = 28
    psLinearDodge = 11
    psLinearBurn = 7
    psExclusion = 19
    psLuminosity = 23
    psSubtract = 29
    psPassThrough = 1
    psColorDodge = 10
    psDivide = 30
    psSaturationBlend = 21
    psLighten = 8
    psHue = 20
End Enum
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
    Try
        Dim _appref = Activator.CreateInstance(Type.GetTypeFromProgID("Photoshop.Application"))
        Dim _blndmod As EBlendModes = CInt(_appref.activedocument.Activelayer.blendmode)
        MsgBox(_blndmod.ToString)
    Catch ex As Exception
        MsgBox(ex.ToString)
    End Try
End Sub

结果是:PsNormalBlend.你是否期望这样.

Answer 3

我不认为你能做你想做的事。您能做的最接近的事情是使用反射循环遍历枚举，以找到您想要的字符串。

参见：http://www.codeproject.com/Tips/550160/Getting-enum-value-from-another-class-via-Reflecti

试着运行它，看看它是否打印出了psColorBlend的值

var fieldsArray = Type.GetTypeFromProgID("Photoshop.PsBlendMode").GetFields(BindingFlags.Public | BindingFlags.Static);

foreach (var fInfo in fieldsArray)
{
    var ulngValue = (ulong)Convert.ChangeType(fInfo.GetValue(null), typeof(ulong));
    Console.WriteLine(fInfo.Name.ToString(CultureInfo.InvariantCulture) + " : " + ulngValue.ToString(CultureInfo.InvariantCulture));
}