generic error GDI when creating image Files - asp.net

Question

I have a problem with my webSite, I must create one image file for every record in my app.
In my IDE works fine, but I tested it in the IIS and I can't create the image files and I get the Generic Error GDI (System.Runtime.InteropServices.ExternalException)
The image folder have all W/R permissions, this is my Image Generator:
private void generador(string barCode)
{
using (Bitmap bitMap = new Bitmap(barCode.Length * 40, 80))
{
using (Graphics graphics = Graphics.FromImage(bitMap))
{
// IDAHC39M Code 39 Barcode INSTALADO en los fonts del servidor
Font oFont = new Font("IDAHC39M Code 39 Barcode", 16);
PointF point = new PointF(2f, 2f);
SolidBrush blackBrush = new SolidBrush(Color.Black);
SolidBrush whiteBrush = new SolidBrush(Color.White);
graphics.FillRectangle(whiteBrush, 0, 0, bitMap.Width, bitMap.Height);
graphics.DrawString("*" + barCode + "*", oFont, blackBrush, point);
bitMap.Save(HttpContext.Current.Server.MapPath("/codigos/" + barCode + ".png"), ImageFormat.Png);
bitMap.Dispose();
}
}
}
I have my data in a DataTable (just for testing) and when I iterate (calling repeatly generator), I have that error.
I repeat, in my IDE works perfectly, but when te application is published, I have this problem.
Please, anybody can help me?
thanks in advance.
best regards.

Answer 1

As Lex Li said: "System.Drawing is not supported in web apps", Using it cause a LOT of problems. So I decided to use NetBarCode, and I could make it work:
- Install NetBarCode from nuget
- This is the code:
using NetBarcode; //Instalar NetBarcode de NugetPackages o usar la dll
using System.IO; // Filestream
using System.Configuration;
using System.Data;
private void generador(string codigo)
{
var barcode = new Barcode("*" + codigo.Trim() + "*", NetBarcode.Type.Code39, true);
var value = barcode.GetBase64Image();
string filepath = Server.MapPath("~/codigos/" + codigo.Trim() + ".jpeg"); //Generar archivo
var bytess = Convert.FromBase64String(value);
using (var imageFile = new FileStream(filepath, FileMode.Create))
{
imageFile.Write(bytess, 0, bytess.Length);
imageFile.Flush();
}
}
protected void Bucle(object sender, EventArgs e)
{
DataTable dt = new DataTable();
dt.Columns.Add("Nif");
dt.Columns.Add("Estudiante");
dt.Columns.Add("Titulo");
// Emulating my data
// dt.Rows.Add("01769459"......)
foreach (DataRow row in dt.Rows)
{
generador(row["Nif"].ToString());
}
}
But if you want, you must control the memory stream, example (simliar), I use QRCoder.dll for it:
protected void Generar(string nif, string fileName)
{
QRCodeGenerator qrGenerador = new QRCodeGenerator();
QRCodeGenerator.QRCode qrCode = qrGenerador.CreateQrCode(nif, QRCodeGenerator.ECCLevel.Q);
System.Web.UI.WebControls.Image imgQrCode = new System.Web.UI.WebControls.Image();
imgQrCode.Height = 150;
imgQrCode.Width = 150;
string filepath = Server.MapPath("~/files/" + fileName.Trim() + ".jpeg"); //Generar archivo
Bitmap bitmap = qrCode.GetGraphic(20);
using (MemoryStream memory = new MemoryStream())
{
using (FileStream fs = new FileStream(filepath, FileMode.Create, FileAccess.ReadWrite))
{
bitmap.Save(memory, ImageFormat.Jpeg);
byte[] bytes = memory.ToArray();
fs.Write(bytes, 0, bytes.Length);
}
}
}