/// <summary>
/// 根据左上角坐标、长、高，实现截图
/// </summary>
/// <param name="vehicleImage">图片二进制流</param>
/// <param name="image1Url">图片路径</param>
/// <param name="vehicleRegionLeft">左上角X轴坐标</param>
/// <param name="vehicleRegionTop">左上角Y轴坐标</param>
/// <param name="vehicleRegionWidth">宽度</param>
/// <param name="vehicleRegionHeight">高度</param>
/// <returns></returns>
public ActionResult GetVehicleImageByRegion(
string vehicleImage,
string image1Url,
int vehicleRegionLeft,
int vehicleRegionTop,
int vehicleRegionWidth,
int vehicleRegionHeight)
{
if (!
string.IsNullOrEmpty(vehicleImage) &&
FileHelper.Exists(vehicleImage))
{
byte[] buffer =
FileHelper.ReadAllBytes(vehicleImage);
return File(buffer,
"image/jpeg");
}
else if (!
string.IsNullOrEmpty(image1Url))
{
Bitmap image1Bitmap =
null;
Bitmap newBit =
null;
if (image1Url.ToLower().Contains(
"http"))
//http路由
{
WebRequest request =
WebRequest.Create(image1Url);
WebResponse response =
request.GetResponse();
if(response ==
null)
return File(
new byte[
0],
"image/jpeg");
Stream stream =
response.GetResponseStream();
image1Bitmap =
(Bitmap)Image.FromStream(stream);
}
else //ftp路径
{
if (!
FileHelper.Exists(image1Url))
return File(
new byte[
0],
"image/jpeg");
image1Bitmap =
(Bitmap)Image.FromFile(image1Url);
}
try
{
newBit =
new Bitmap(vehicleRegionWidth, vehicleRegionHeight);
using (Graphics g = Graphics.FromImage(newBit))
//实现截图
{
g.DrawImage(image1Bitmap,
new Rectangle(
0,
0, newBit.Width, newBit.Height),
new Rectangle(vehicleRegionLeft, vehicleRegionTop,
newBit.Width, newBit.Height),
GraphicsUnit.Pixel);
using (MemoryStream ms =
new MemoryStream())
{
newBit.Save(ms, ImageFormat.Jpeg); //保存图片
return File(ms.ToArray(),
"image/jpeg");
}
}
}
finally
{
if (image1Bitmap !=
null)
image1Bitmap.Dispose();
if (newBit !=
null)
newBit.Dispose();
}
}
return File(
new byte[
0],
"image/jpeg");
}
转载于:https://www.cnblogs.com/zhengwk/p/5530602.html
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