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嘗試使用條形碼字體創建條形碼圖像時出現錯誤。這在生產中發生,但不在開發中。使用DrawString時的GDI +異常()
的方法,創建所述條形碼是:
/// <summary>
/// Create a barcode image by writing out a string using a barcode font and save it
/// </summary>
/// <param name="barcodeText">The text string of the barcode</param>
/// <param name="saveLocation">Where to save the file to</param>
/// <param name="font">The barcode font</param>
/// <param name="imageFormat">The image format</param>
private void CreateBarcodeImage(string barcodeText, string saveLocation, System.Drawing.Font font, ImageFormat imageFormat)
{
// Draw the barcode image
using (Bitmap bmp = new Bitmap(500, 75))
{
try
{
using (Graphics g = Graphics.FromImage(bmp))
{
g.Clear(_backgroundColour);
g.DrawString(barcodeText, font, _foregroundBrush, 10, 0);
bmp.Save(saveLocation, imageFormat);
g.Dispose();
}
}
catch (Exception ex)
{
Log.ErrorException("Exception in LabelPrinter.CreateBarcodeImage()", ex);
throw;
}
}
}
該代碼在一個循環中被稱爲需要若干條形碼。在開發環境中,它可以正常工作(在Win XP Pro中,在winforms應用程序中使用.net 3.5 SP1),將創建2個條形碼,並在第三次引發異常。
異常被提出&堆棧跟蹤是:
An unhandled exception has occurred Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
at System.Drawing.SafeNativeMethods.Gdip.GdipMeasureString(HandleRef graphics, String textString, Int32 length, HandleRef font, GPRECTF& layoutRect, HandleRef stringFormat, GPRECTF& boundingBox, Int32& codepointsFitted, Int32& linesFilled)
at System.Drawing.Graphics.MeasureString(String text, Font font, SizeF layoutArea, StringFormat stringFormat)
at System.Drawing.Graphics.MeasureString(String text, Font font)
at Srcl.WasteTrak.Gui.Documents.LabelPrinter.CreateBarcodeImage(String barcodeText, String saveLocation, Font font, ImageFormat imageFormat)
in c:\scc\SRCL\SRCL.WasteTrak\SRCL.WasteTrak.Gui\Documents\LabelPrinter.cs:line 60
我無法找出是什麼原因造成的問題,但谷歌從搜索這似乎是調用非託管代碼的原因,但我避風港」找到了解決方案。
有人嗎?
您是否嘗試過使用不同的字體來查看它是否有所作爲?您在Graphics對象上調用.Dispose()兩次,btw。 – 2009-06-30 13:31:04