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[英]C# - Fastest way to convert an int and put it in a byte array with an offset
[英]fastest way to create a jpeg from byte array c#
我在陣列中有一個圖像,並且以這種方式保存它:
ImageConverter ic = new ImageConverter();
Image img = (Image)ic.ConvertFrom(Jpeg);
Bitmap bitmap1 = new Bitmap(img);
string saveString = "c:\\M_files\\new_pics\\" + pictureCounter + ".jpg";
bitmap1.Save(saveString, System.Drawing.Imaging.ImageFormat.Jpeg);
它可以工作,但是我需要它更快,因為它需要來自流式攝像機的圖像。 有沒有更快的方法? 我的數組以字節為單位,然后使用容器將其轉換為位圖,然后另存為jpeg 。
嘗試使用此代碼,它可以快速有效地工作,在這段代碼中,您可以將圖片轉換為JPEG來指定寬度和高度,並可以傳遞任意數量的圖像。 您可以將其修改為自己的需求。
public void CreateThumbnail(string[] b, double wid, double hght, bool Isprint)
{
string[] path;
path = new string [64];
path = b;
string saveath = "i:\\check\\a test\\";
for (int i = 0; i < b.Length; i++)
{
DirectoryInfo dir = new DirectoryInfo(path[i]);
string dir1 = dir.ToString();
dir1 = dir1.Substring(dir1.LastIndexOf("\\"));
FileInfo[] files1 = dir.GetFiles();
foreach (FileInfo f in files1)
{
string gh = f.ToString();
try
{
System.Drawing.Image myThumbnail150;
System.Drawing.Image.GetThumbnailImageAbort myCallback = new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback);
System.Drawing.Image imagesize = System.Drawing.Image.FromFile(f.FullName);
Bitmap bitmapNew = new Bitmap(imagesize);
double maxWidth = wid;
double maxHeight = hght;
int w = imagesize.Width;
int h = imagesize.Height;
// Longest and shortest dimension
int longestDimension = (w > h) ? w : h;
int shortestDimension = (w < h) ? w : h;
// propotionality
float factor = ((float)longestDimension) / shortestDimension;
// default width is greater than height
double newWidth = maxWidth;
double newHeight = maxWidth / factor;
// if height greater than width recalculate
if (w < h)
{
newWidth = maxHeight / factor;
newHeight = maxHeight;
}
myThumbnail150 = bitmapNew.GetThumbnailImage((int)newWidth, (int)newHeight, myCallback, IntPtr.Zero);
string ext = Path.GetExtension(f.Name);
if (!Directory.Exists(saveath + dir1))
{
Directory.CreateDirectory(saveath + dir1);
myThumbnail150.Save(saveath + dir1 + "\\" + f.Name.Replace(ext, ".Jpeg"), System.Drawing.Imaging.ImageFormat.Jpeg);
}
else if(Directory.Exists(saveath+dir1))
{
myThumbnail150.Save(saveath + dir1+" \\"+ f.Name.Replace(ext, ".Jpeg"), System.Drawing.Imaging.ImageFormat.Jpeg);
}
}
catch (Exception ex)
{
Console.WriteLine("something went wrong" + ex.ToString());
}
}
}
}
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