public Bitmap Render(String str)
{
Bitmap bitmap = null;
try
{
if (ZBarcode.EncodeAndBuffer(ref SymbolStruct, str, str.Length, this.Rotation) == 0)
{
// no error returned, create barcode preview
bitmap = new Bitmap(SymbolStruct.bitmap_width, SymbolStruct.bitmap_height);
byte[] bitmapBytes = new byte[SymbolStruct.bitmap_height * SymbolStruct.bitmap_width * 3];
Marshal.Copy(SymbolStruct.bitmap, bitmapBytes, 0, bitmapBytes.Length);
// write image pixel-by-pixel
int row, column, i = 0;
int red, blue, green;
for (row = 0; row < SymbolStruct.bitmap_height; row++)
{
for (column = 0; column < SymbolStruct.bitmap_width; column++)
{
red = bitmapBytes[i];
green = bitmapBytes[i + 1];
blue = bitmapBytes[i + 2];
bitmap.SetPixel(column, row, Color.FromArgb(red, green, blue));
i += 3;
}
}
// reset bitmap
ZBarcode.Clear(ref SymbolStruct);
// ZBarcode.Clear() does not do this correctly in DLL, requires doing it manually...
SymbolStruct.row_height = null;
SymbolStruct.height = 0;
}
else
{
if (SymbolStruct.errtxt == null)
{
SymbolStruct.errtxt = "error!";
}
bitmap = WriteErrorImage(SymbolStruct.errtxt);
}
}
catch (Exception e)
{
// dll not found, application aborted
bitmap = WriteErrorImage("Fatal error: a DLL is missing");
}
return(bitmap);
}
static Symbology()
{
try {
SymbolStruct = (zint_symbol)
// generate managed counterpart of struct
Marshal.PtrToStructure(ZBarcode.Create(), typeof(zint_symbol));
}
catch (Exception e)
{
// dll not found, application aborted
}
}