Unity3d实现自由选中框并截图保存功能(三)选择路径保存截图功能
前言
- 前言
- 实现效果
- 定义OpenFileName类
- 定SelectFileDialog类
- 选择文件
- 项目源码
前两篇实现了自由框选和截图保存的功能:
Unity3d实现自由选中框并截图保存功能(一)自由选中框实现 Unity3d实现自由选中框并截图保存功能(二)截图保存功能
本篇来实现用户手动选择截图保存路径以及文件名的功能,主要是使用System.Runtime.InteropServices内库来实现。
实现效果保存的截图:
这个类是固定的结构,详细说明可以查看官方文档 OpenFileName详细参数 https://docs.microsoft.com/zh-cn/windows/win32/api/commdlg/ns-commdlg-openfilenamea?redirectedfrom=MSDN
主要用于GetSaveFileName的传参。
using System;
using System.Runtime.InteropServices;
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public class OpenFileName
{
public int structSize = 0;
public IntPtr dlgOwner = IntPtr.Zero;
public IntPtr instance = IntPtr.Zero;
public String filter = null;
public String customFilter = null;
public int maxCustFilter = 0;
public int filterIndex = 0;
public String file = null;
public int maxFile = 0;
public String fileTitle = null;
public int maxFileTitle = 0;
public String initialDir = null;
public String title = null;
public int flags = 0;
public short fileOffset = 0;
public short fileExtension = 0;
public String defExt = null;
public IntPtr custData = IntPtr.Zero;
public IntPtr hook = IntPtr.Zero;
public String templateName = null;
public IntPtr reservedPtr = IntPtr.Zero;
public int reservedInt = 0;
public int flagsEx = 0;
}
定SelectFileDialog类
这个类主要定义了系统的函数。
using System.Runtime.InteropServices;
public class SelectFileDialog
{
//系统函数
[DllImport("Comdlg32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
public static extern bool GetSaveFileName([In, Out] OpenFileName ofn);
public static bool GetSFN([In, Out] OpenFileName ofn)
{
return GetSaveFileName(ofn);
}
}
选择文件
新建OpenFileName对象并进行赋值。
IEnumerator CutImage()
{
string Name = DateTime.Now.ToString("yyyyMMddHHmmss");
Tex = new Texture2D((int)Mathf.Abs(StMsPos.x - EdMsPos.x), (int)Mathf.Abs(StMsPos.y - EdMsPos.y), TextureFormat.RGB24, true);
CutRect = new Rect(StMsPos.x> EdMsPos.x? EdMsPos.x: StMsPos.x,
StMsPos.y > EdMsPos.y ? EdMsPos.y : StMsPos.y,
Mathf.Abs(EdMsPos.x - StMsPos.x),
Mathf.Abs(EdMsPos.y - StMsPos.y));
yield return new WaitForEndOfFrame();
Tex.ReadPixels(CutRect, 0, 0, true);
Tex.Apply();
yield return Tex;
byte[] bytes = Tex.EncodeToPNG();
string path = Application.dataPath + "/" + Name + ".png";
OpenFileName file = new OpenFileName();
file.structSize = Marshal.SizeOf(file);
file.filter = "文件(*.png)";
file.file = new string(new char[256]);
file.maxFile = file.file.Length;
file.fileTitle = new string(new char[64]);
file.maxFileTitle = file.fileTitle.Length;
file.initialDir = Application.streamingAssetsPath.Replace('/', '\\');//默认路径
file.title = "保存文件";
file.templateName = Name;
file.flags = 0x00080000 | 0x00001000 | 0x00000800 | 0x00000008;
if (SelectFileDialog.GetSaveFileName(file))
{
path = file.file + ".png";
}
File.WriteAllBytes(path, bytes);
}
这里的filter属性定义了选择的范围必须是“png”后缀文件。
file.filter = "文件(*.png)";
项目源码
https://download.csdn.net/download/qq_33789001/16092637