[英]Why I'm getting black rectangle instead my Bitmap when try to save it
所以問題是為什么在保存這樣的位圖時我總是得到黑色矩形
myBitmap.Save(Path.GetDirectoryName(myFilePath)+"\\temp.bmp",System.Drawing.Imaging.ImageFormat.Bmp);
這有什么問題?
UPD這是我獲取位圖的方式。 實際上,它是“ Interleaved 2 of 5”格式的郵政條形碼
Image barcodeImage = new System.Drawing.Bitmap(mImgWidth == 0 ? DEFAULT_WIDTH : mImgWidth, mImgHeight == 0 ? DEFAULT_HEIGHT : mImgHeight);
using (Graphics gr = Graphics.FromImage(barcodeImage))
{
int textStartPosX = (int)((float)BARCODE_TEXT_LEFT_MARGIN * mScaleRatioW);
int textStartPosY = (int)((float)BARCODE_TEXT_TOP_MARGIN * mScaleRatioH);
int textRectWidth = (int)((float)BARCODE_TEXT_WIDTH * mScaleRatioW);
int textRextHeight = (int)((float)BARCODE_TEXT_HEIGHT * mScaleRatioH);
//float textSize = DEFAULT_TEXT_SIZE + DEFAULT_TEXT_SIZE;
RectangleF textRect = new RectangleF(textStartPosX, textStartPosY, textRectWidth, textRextHeight);
gr.SmoothingMode = SmoothingMode.AntiAlias;
gr.InterpolationMode = InterpolationMode.HighQualityBicubic;
gr.PixelOffsetMode = PixelOffsetMode.HighQuality;
gr.DrawString(RUSSIAN_POST, new Font("Helvetica", 7), Brushes.Black, textRect);
int barCodeStartPosX = (int)(((float)BARCODE_LEFT_MARGIN) * mScaleRatioW);
int barCodeTopMargin = (int)(((float)BARCODE_TOP_MARGIN) * mScaleRatioH);
int barCodeHeight = (int)((float)BARCODE_HEIGHT * mScaleRatioH);
for (int codeidx = 0; codeidx < barcodeString.Length; codeidx++)
{
char code = barcodeString[codeidx];
int barwidth = ((code == 'N') || (code == 'n')) ? (int)((float)1 * mScaleRatioW) : (int)((float)3 * mScaleRatioW);
if ((code == 'N') || (code == 'W'))
{
gr.FillRectangle(System.Drawing.Brushes.Black, barCodeStartPosX, barCodeTopMargin, barwidth, barCodeHeight);
}
barCodeStartPosX += barwidth;
}
int numStartPosX = (int)(((float)BARCODE_NUM_LEFT_MARGIN) * mScaleRatioW);
int numStartPosY = (int)((float)BARCODE_NUM_TOP_MARGIN * mScaleRatioH);
int numRectWidth = (int)((float)BARCODE_NUM_WIDTH * mScaleRatioW);
int numRextHeight = (int)((float)BARCODE_NUM_HEIGHT * mScaleRatioH);
gr.SmoothingMode = SmoothingMode.AntiAlias;
gr.InterpolationMode = InterpolationMode.HighQualityBicubic;
gr.PixelOffsetMode = PixelOffsetMode.HighQuality;
RectangleF barCodeNumRect = new RectangleF();
for (int i = 0; i < 4; i++) {
float startX;
switch (i) {
case 0: barCodeNumRect = new RectangleF(numStartPosX, numStartPosY, numRectWidth, numRextHeight);
gr.DrawString(barcodeNumber.Substring(0,6), new Font("Helvetica", 7), Brushes.Black, barCodeNumRect);
break;
case 1:
numStartPosX = (int)( (numStartPosX + BARCODE_NUM_MONTH_LEFT_PADDING) * mScaleRatioW);
barCodeNumRect = new RectangleF(numStartPosX, numStartPosY, numRectWidth, numRextHeight);
gr.DrawString(barcodeNumber.Substring(6, 2), new Font("Helvetica", 7), Brushes.Black, barCodeNumRect);
break;
case 2:
numStartPosX = (int)((numStartPosX + BARCODE_NUM_VALUE_LEFT_PADDING) * mScaleRatioW);
barCodeNumRect = new RectangleF(numStartPosX, numStartPosY, numRectWidth, numRextHeight);
gr.DrawString(barcodeNumber.Substring(8, 5), new Font("Helvetica", 7, FontStyle.Bold), Brushes.Black, barCodeNumRect);
break;
case 3:
numStartPosX = (int)((numStartPosX + BARCODE_NUM_CHECKDIGIT_LEFT_PADDING) * mScaleRatioW);
barCodeNumRect = new RectangleF(numStartPosX * mScaleRatioW, numStartPosY, numRectWidth, numRextHeight);
gr.DrawString(barcodeNumber.Substring(13, 1), new Font("Helvetica", 7), Brushes.Black, barCodeNumRect);
break;
default: break;
}
}
}
UPD 2在沒有System.Drawing.Imaging.ImageFormat.Bmp的情況下保存時沒有問題
嘗試使用這種方式保存:
WriteableBitmap eb = new WriteableBitmap(bitmapImage);
MemoryStream memoryStream1 = new MemoryStream();
eb.SaveJpeg(memoryStream1, bitmapImage.PixelWidth, bitmapImage.PixelHeight, 0, 100);
memoryStream1.Seek(0, SeekOrigin.Begin);
MediaLibrary library1 = new MediaLibrary();
string filename1 = "SavedPicture_" + DateTime.Now.ToString("y_M_d_H_m_s");
Picture pic1 = library1.SavePicture(filename1, memoryStream1);
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