memorystream - Access File in memory stream ? c# -

memorystream - Access File in memory stream ? c# -

i'm using code save file memory stream

using system.drawing.imaging; dictionary<string,memorystream> dict = new dictionary<string,memorystream>(); dict.add("mypicture.png",new memorystream()); bmp.save(dict["mypicture.png"], imageformat.bmp);

after have function accepts file name

result = drawmatches.draw("box.png", "mypicture.png", out matchtime,i);

am accessing file memory stream correctly? in function it's saying

invalid argument

i think i'm not accessing file in right way memory stream

this drawmatches.draw:

public static image<bgr, byte> draw(string modelimagefilename, string observedimagefilename, out long matchtime,int i) { image<gray, byte> modelimage = new image<gray, byte>(modelimagefilename); image<gray, byte> observedimage = new image<gray, byte>(observedimagefilename); }

error not in compilation, when running

it says " parameter not valid " , points observedimage

i'm not sure image<gray, byte> class , how implemented, you're passing string constructor - sure correct? (edit: found out part of emgu implementation). i'll show how you'd create image stream:

memorystream ms = dict["mypicture.png"]; // gives memory stream dictionary ms.seek(0, seekorigin.begin); // go origin of stream bitmap bmp = new bitmap(ms); // create image stream

now suspect want create new "emgu image" stream have using next constructor:

image<bgr, byte> img1 = new image<bgr, byte>("myimage.jpg");

which - according emgu documentation - supposed read image file. don't have file named "mypicture.png", have stream within dictionary under key "mypicture.png", totally different. uncertainty image<t1, t2> class able read stream - @ to the lowest degree didn't see in docs.

what need phone call (using code provided above):

image<gray, byte> img1 = new image<gray, byte>(bmp);

all beingness said, code draw method (which can't static, way) should read this:

private bitmap getbitmapfromstream(string bitmapkeyname) { memorystream ms = dict[bitmapkeyname]; ms.seek(0, seekorigin.begin); homecoming new bitmap(ms); } public image<bgr, byte> draw(string modelimagefilename, string observedimagefilename, out long matchtime,int i) { image<gray, byte> modelimage = new image<gray, byte>(getbitmapfromstream(modelimagefilename)); image<gray, byte> observedimage = new image<gray, byte>(getbitmapfromstream(observedimagefilename)); }

edit in comments below want cut down processing time saving bitmaps memory stream instead of writing disk.

i need inquire following: why do in first place? notice code posted above have bitmap save memory stream. why don't set bitmap dictionary?

dictionary<string, bitmap> dict = new dictionary<string, bitmap>(); dict.add("mypicture.png", bmp);

then retrieve right away less time beingness wasted storing , reading image stream. draw method read:

public image<bgr, byte> draw(string modelimagefilename, string observedimagefilename, out long matchtime,int i) { image<gray, byte> modelimage = new image<gray, byte>(dict[modelimagefilename); image<gray, byte> observedimage = new image<gray, byte>(dict[observedimagefilename]); }

c# memorystream