Question : [c#]Invalid parameter used when trying to save a graphic.

Hi,

edit: sorry, this is the wrong area. This should go to c# offcourse!

well, 1st of all, lets see if I can do this right :)

2nd: The problem!

I have an uploader class, wich (offcourse)  uploads an image to the server and then it should resize it. I started of writing this in vb.Net (wich is my "native" language) but as I was studying c# aswell, i figured, let's rewrite it to c#. The vb.Net version worked great. But I've converted it to c# and now I get an error. (Invalid parameter used.)

Here's the code:
This is the code to upload an image.
[code]
public string UploadImage(System.Web.HttpPostedFile inputinstance)
{
if(! (inputinstance == null))
{
string strLongFilePath = inputinstance.FileName ;
string filename;
filename =  System.Guid.NewGuid().ToString()+".jpg";
string serverpath = @ConfigurationSettings.AppSettings["storagefolder"].ToString();
inputinstance.SaveAs(serverpath + filename);
string fullpath;
fullpath = serverpath + filename;
ResizeImage(fullpath);
return bestandsnaam;
}
else
throw new ArgumentException("Some error message :)");
}
[/code]

Here's the code of ResizeImage:
[code]
private string ResizeImage(string ImgPath)
{
int width,height;
int canvaswidth,canvasheight;
System.Drawing.Imaging.ImageFormat imgFormat = GetImageFormat(ImgPath);
System.Drawing.Image img = System.Drawing.Image.FromFile(ImgPath);
if (img.Width <= 0 && img.Height <= 0)
{
throw new ArgumentException("X and / or Y cannot be neg. ints!");
}
else
{
if (img.Height > img.Width)
{
canvaswidth = 1253;
canvasheight = 1843;
}
else
{
canvaswidth = 1843;
canvasheight = 1253;
}
}

int x ;
int y ;
x = img.Height;
y = img.Width;

int newx, newy, offsetx, offsety ;
if (x >= y)
{
if(1677 * y / x <= 1088)
{
newx = 1677 * y / x ;
newy = 1677 ;
}
else
{
newx = 1088;
newy = 1088 * x / y;
}

}
else
{
if(1677 * x / y <=1088)
{
newx = 1677 ;
newy = 1677 * x / y;
}
else
{
newx = 1088 * y / x;
newy = 1088;
}
}

width = newx;
height = newy;
offsetx = (canvaswidth - width) / 2;
offsety = (canvasheight - height) / 2;

System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(canvaswidth, canvasheight);
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(((System.Drawing.Image)bmp));
g.FillRectangle(new System.Drawing.SolidBrush (System.Drawing.Color.White), 0, 0, canvaswidth, canvasheight);
g.DrawImage(img, offsetx, offsety, width, height);

EncoderParameters eps = new EncoderParameters(1);
eps.Param[0] = new EncoderParameter(Encoder.Quality, 90);
ImageCodecInfo ici = GetEncoderInfo("image/jpeg");

img.Dispose();
bmp.Save(@ImgPath,ici,eps);
bmp.Dispose();

return null ;
}
[/code]
Well, I hope this is enough for someone to help me. There are two more functions being used: GetImageForm and GetEncoderInfo, but as far as I know these are standard functions being used by a lot of people.

There is an error on the line: bmp.Save(@ImgPath,ici,eps); It's almost the last line of the code.

Please note: this is my first time asking a question here, so I hope I'm doing this correct.

Thanks in advance...

Ton

Answer : [c#]Invalid parameter used when trying to save a graphic.

PAQ, refund 200 points.

Thanks!
amp
ee admin

(Thanks for all your help today, TAD!)