网络摄像头API常量问题 [英] Webcam API Constants problem

问题描述

大家好，

我有一个应用程序，我正在从VB.NET转换为C＃。 该应用程序使用网络摄像头。 我设法使大部分代码正常工作，除了以下内容：

 public const int WM_CAP_DLG_VIDEOFORMAT = WM_CAP_START + 41; 
 public const int WM_CAP_DLG_VIDEOSOURCE = WM_CAP_START + 42; 
 public const int WM_CAP_DLG_VIDEODISPLAY = WM_CAP_START + 43; 
 public const int WM_CAP_GET_VIDEOFORMAT = WM_CAP_START + 44; 
 public const int WM_CAP_SET_VIDEOFORMAT = WM_CAP_START + 45; 

这五行抛出一个错误，说它不能隐式转换类型'long'键入'int。' 我该如何解决这个问题？

谢谢！

Jason

解决方案

< blockquote>

这意味着您之前有过这一行：

  &NBSP; public const long WM_CAP_START;

更改"long" to"int"。

Hi all,

I have an application that I'm converting from VB.NET to C#.  The application uses the webcam.  I've managed to get most of the code working right, except for the following:

 public const int WM_CAP_DLG_VIDEOFORMAT = WM_CAP_START + 41;
        public const int WM_CAP_DLG_VIDEOSOURCE = WM_CAP_START + 42;
        public const int WM_CAP_DLG_VIDEODISPLAY = WM_CAP_START + 43;
        public const int WM_CAP_GET_VIDEOFORMAT = WM_CAP_START + 44;
        public const int WM_CAP_SET_VIDEOFORMAT = WM_CAP_START + 45;

Those five lines throw an error saying that it can't implicitly convert type 'long' to type 'int.'  How can I fix this?

Thanks!

Jason

解决方案

The implication is that you had this line earlier on:

    public const long WM_CAP_START;

Change that "long" to "int".

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