上传图片等比例缩放问题

mebboyrui 2011-12-04 01:02:48

上传图片并保存缩小后的图片，但是不保存原图能实现吗？
public bool ThumbnailCallback()
{

return false;

}
private void SaveImage(string filePath)
{
string fileName = Path.GetExtension(upLoad.PostedFile.FileName).ToLower();
string _filename = DateTime.Now.ToString("yyMMddHHmmss");

System.Drawing.Image image = null, aNewImage = null;

//下面是生成缩略图
int newwidth = 0, newheight = 0;
image = System.Drawing.Image.FromFile(filePath);
System.Drawing.Image.GetThumbnailImageAbort callb = new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback);

//取高和宽
int phWidth = image.Width;
int phHeight = image.Height;

//设置缩略的宽度和高度
if (phWidth > 110)
{
//指定宽度
newwidth = 110;
//根据宽度算出高度
newheight = phHeight * newwidth / phWidth;
}
aNewImage = image.GetThumbnailImage(newwidth, newheight, callb, new System.IntPtr());
//将缩略图重新命名并保存
aNewImage.Save(Server.MapPath("~/files/file/") + DateTime.Now.ToString("yyMMddHHmmss") + fileName);
image.Dispose();
}

SaveImage(string filePath)里面的filePath可不可以用上传空间里面得到的upLoad.PostedFile.FileName值？
难道只能用服务器端的路径？

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andyalex 2011-12-10

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上传的时候，你先保存到图片里嘛，
楼上两位说的很清楚了

orain 2011-12-10

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	private static System.Drawing.Bitmap ResizeImage(System.IO.Stream fileStream)

	{

		int maxW = Information.ReportPhotoMaxWidth;

		int maxH = Information.ReportPhotoMaxHeight;

		System.Drawing.Bitmap img = new System.Drawing.Bitmap(fileStream);

		int w = img.Width;

		int h = img.Height;

		bool flag = false;

		if (w > maxW)

		{

			flag = true;

			h = maxW * h / w;

			w = maxW;

		}

		if (h > maxH)

		{

			flag = true;

			w = maxH * w / h;

			h = maxH;

		}



		return flag ? new System.Drawing.Bitmap(img, w, h) : img;

	}