All better now - C# Discussion Boards

Re: Getting pointer to DLL loaded by other program

James T. Johnson16-May-03 4:25

16-May-03 4:25

curiousgal wrote:
One of my applications is loading DLLs into memory

By DLLs are you meaning .NET Assemblies or are you meaning C/C++ DLLs?

Once .NET Assemblies are loaded into an AppDomain they cannot then be unloaded unless you unload the entire AppDomain. Not sure what you can do if it is a C/C++ DLL, you could try calling FreeLibrary but there might be hidden functionality relying on that DLL still being loaded.

James

"I despise the city and much prefer being where a traffic jam means a line-up at McDonald's"
Me when telling a friend why I wouldn't want to live with him

Savedialog with serlization..

tuan_tomy15-May-03 2:25

tuan_tomy

15-May-03 2:25

When I use SOAP format or binary format ... C# error that : ImageList is not mark as serliazation ....? How to mark ImageList as serlization ????

- what is PublicTokenType ?

COM interop and BSTR

dshield15-May-03 1:44

dshield

15-May-03 1:44

I have a COM object that returns a binary string in a BSTR. .NET marshals this to a string. The problem is that some of the bytes get dropped when this happens.

As an example, load a PFD file into a byte array. Convert the byte array to a string, and then convert the string back to a byte array (UTF-8). If you compare the two byte arrays, they aren't the same.

I probably haven't explaied this very well, but I hope I haven't made it too confusing. Has anyone had any experience with this, and what can I do to make it work?

Thanks.

They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety.
--Benjamin Franklin, 1759

Re: COM interop and BSTR

Ranjan Banerji15-May-03 3:16

Ranjan Banerji

15-May-03 3:16

Do you mean PDF file? If so what has loading the file got to do with COM? I have written quite a bit of code moving, loading PDFs etc. And I do it as Streams and byte arrays and have yet to see a problem.

Perhaps if you explain in more detail I may be able to help.

Re: COM interop and BSTR

dshield15-May-03 4:37

dshield

15-May-03 4:37

The COM object creates the PDF file on the fly. It's a third party control, so there isn't too much we can do about it.

I think my example of loading and manipulating a PDF file isn't the best example, because it doesn't really simulate the problem.

However, just out of curiousity, is there anything wrong with the following code:

<br />
// Assume that pdfFile is a FileSteam object that has opened a pdf file,<br />
// length is an int initialized to the size of the file, and that pdfBytes<br />
// is a byte array of size length.<br />
pdfFile.Read(pdfBytes, 0, length)<br />
<br />
// Convert the pdfBytes array to a string<br />
string pdfString = Encoding.UTF8.GetString(pdfBytes);<br />
<br />
// Convert the string to a new byte array<br />
string pdfBytes2 = Encoding.Unicode.GetBytes(pdfString);<br />

At this point, pdfBytes and pdfBytes2 should be the same, correct? This is not the behavior I'm seeing. I'm new to C#, and probably have made a very obvious mistake, but I would really appreciate someone pointing it out to me.

They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety.
--Benjamin Franklin, 1759

Re: COM interop and BSTR

Ranjan Banerji15-May-03 6:28

Ranjan Banerji

15-May-03 6:28

Hmmm, not sure why the behaviour would be like that. I never have to convert the byte array in a string. I just carry it around till I have to write it out. I am not sure what happens behind the scene when the byte array is converted to a string. Maybe some stuff does not convert. What if you create a byte array with simple text or numbers and try the same. If that works then maybe its something in the PDF that does not convert well to a string. Just guessing. Sorry could not be of more help.

Re: COM interop and BSTR

Richard Deeming15-May-03 8:17

Richard Deeming

15-May-03 8:17

Unicode is UTF-16, which may be slightly different from UTF-8. Unsure | :~

"These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer

All better now

dshield15-May-03 9:02

dshield

15-May-03 9:02

The interop part of marshaling the BSTR to a string was working ok. The problem was with the conversion from a Unicode array to a byte array. The correct converstion is:

<br />
byte[] pdfBytes = Encoding.Convert(Encoding.Unicode, Encoding.Default,<br />
                                   Encoding.Unicode.GetBytes(pdfString));<br />

What I had been trying to convert to UTF-8, which was what was causing the problems. Converting to Default solved the problem.

Thanks for all the comments.

Dan

They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety.
--Benjamin Franklin, 1759

Re: All better now

Ranjan Banerji15-May-03 10:20

Ranjan Banerji

15-May-03 10:20

Thanks for posting the solution. Am sure I will need it one day. Smile | :)

Java class to C#: inheritance problem

cabo15-May-03 0:51

cabo

15-May-03 0:51

I'm currently converting some Java code to C# and
if have problems converting this:
Java:
public class MySuperClass {
String generateShowMe() {
return "ShowMe from MySuperClass";
}

public void ShowMe() {
System.out.println(generateShowMe());
}
}
public class MyChildClass extends MySuperClass {
String generateShowMe() {
return "ShowMe from MyChildClass";
}

public void ShowMe() {
super.ShowMe();
}
}
When i call MySuperClass.ShowMe() i get of course
"ShowMe from MySuperClass", but when i call
MyChildClass.ShowMe(), i get "ShowMe from MyChildClass".
-> although the child class calls the base (super) class to show the string, the super class calls generateShowMe() from the child class.
How can i to this in C#?
(i currently simulate this, by using a delegate to call generateShowMe())

thanks,
Carsten

Re: Java class to C#: inheritance problem

Philip Fitzsimons15-May-03 3:08

Philip Fitzsimons

15-May-03 3:08

I think you mean

base.ShowMe();

"When the only tool you have is a hammer, a sore thumb you will have."

Re: Java class to C#: inheritance problem

cabo15-May-03 5:32

cabo

15-May-03 5:32

obsolete - don't won't to blame my self Wink | ;)

see Richard Deeming post for a working sample.
(I'm not a friend of editing post after someone answered it, but i am to "embarrassed" about my post Blush | :O

Thanks to Philip Fitzsimons and Richard Deeming.

Re: Java class to C#: inheritance problem

Richard Deeming15-May-03 8:23

Richard Deeming

15-May-03 8:23

Could be something to do with the fact that MyChildClass.generateShowMe returns "ShowMe from MySuperClass" instead of "ShowMe from MyChildClass". Poke tongue | ;-P

cabo wrote:
public class MyChildClass : MyBaseClass {
protected override string generateShowMe() {
return "ShowMe from MySuperClass";}
public new void ShowMe() {
base.ShowMe();}
}

"These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer

Re: Java class to C#: inheritance problem

Philip Fitzsimons16-May-03 2:39

Philip Fitzsimons

16-May-03 2:39

lol

"When the only tool you have is a hammer, a sore thumb you will have."

Re: Java class to C#: inheritance problem

Richard Deeming15-May-03 8:21

Richard Deeming

15-May-03 8:21

This should work:

C#:
public class MySuperClass
{
    protected virtual string generateShowMe()
    {
        return "ShowMe from MySuperClass";
    }
    
    public virtual void ShowMe()
    {
        Console.WriteLine(generateShowMe());
    }
}
 
public class MyChildClass : MySuperClass 
{
    protected override string generateShowMe()
    {
        return "ShowMe from MyChildClass";
    }
    
    // Not really necessary, but you can
    // do it if necessary:
    public override void ShowMe() 
    {
        base.ShowMe();
    }
}

"These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer

Re: Java class to C#: inheritance problem

cabo15-May-03 9:32

cabo

15-May-03 9:32

Thanks, i should know that this works...
But it was in a more complex code, with some unfinished API's, switched between C++/C#/Java and the weather was bad...
Poke tongue | ;-P

reqaurding rtf boxes

jtmtv1814-May-03 22:57

jtmtv18

14-May-03 22:57

i noticed with a rtf box when i select a text that has diffrent size text to it and diffrent colors,and i change the fontstyle of the selected text...it changes the colors, and font of the entire selected string. and doesnt keep intact the individual styles of each char in the selected text.

The teacher at my school asked us to write a method that would take into account each individual char's size, font, color ect. I have been trying to iterate through the rtf.SelectedText collection and isolate each char but how do i get the font and color of a single char in a rtf box ? Does this question make any sense? if not let me know and ill try to rewrite it . anywho any ideas would help...

Jesse M

The Code Project Is Your Friend...

Re: reqaurding rtf boxes

KingTermite15-May-03 3:35

KingTermite

15-May-03 3:35

You need to go through your selection char by char (you can do a select(i,1) in a loop from start of select to end), and then for each char in selection, you can get the color by the oRTFBox.SelectionColor property.

I just had to do something very similar to this. If you get stuck email me (from link) and I can email a code example.

There are only 10 types of people in this world....those that understand binary, and those that do not.

Re: reqaurding rtf boxes

jtmtv1815-May-03 10:11

jtmtv18

15-May-03 10:11

i whipped something together...maybe you can help me work with it. it doesnt seem to work correctly because the Rtf.Select() requires a start index....how can i find the start index of a specific char in the selected text ? heres the code i just kinda through together.

<br />
char[] chars = GetMainFormData.MainTextArea.SelectedText.ToCharArray();<br />
			Color[] cls= new Color[chars.Length];<br />
			int count =0;<br />
			int tmp = GetMainFormData.MainTextArea.SelectedText.Length;<br />
			for(int i =0;i<tmp;i++)<br />
			{				<br />
				GetMainFormData.MainTextArea.Select(GetMainFormData.MainTextArea.SelectedText[i],1);<br />
				Color tmp1 = GetMainFormData.MainTextArea.SelectionColor;<br />
				cls[count] = tmp1;<br />
				GetMainFormData.MainTextArea.SelectionFont = fd.Font;<br />
				GetMainFormData.MainTextArea.SelectionColor = cls[count];<br />
				count++;<br />
			}<br />

Any ideas ?

The Code Project Is Your Friend...

Re: reqaurding rtf boxes

KingTermite16-May-03 2:41

KingTermite

16-May-03 2:41

Here is some code I used for my latest project where I had to do something similar.

----------------

<br />
int iIndex = 0;<br />
<br />
while ( iIndex < (oBox.TextLength) )<br />
{<br />
<br />
// Go one char at a time<br />
oBox.Select(iIndex,1);  // ** oBox is the RichTextBox<br />
<br />
if (null != oBox.SelectionFont)<br />
{<br />
  iSelectedCharTextSize <br />
      = getTextSizeFromFont(oBox.SelectionFont);<br />
}<br />
<br />
if (true != oBox.SelectionColor.IsEmpty)<br />
{<br />
  strSelectedCharColor <br />
     = getHexColorString(oBox.SelectionColor);<br />
}<br />

--------------

You see, though, I went through the whole box from the beginning...not just using what was selected. So you will probably have to find the beginning index based on what is selected. I wouldn't think it would be that hard.

good luck.

chris

There are only 10 types of people in this world....those that understand binary, and those that do not.

Re: reqaurding rtf boxes

jtmtv1816-May-03 8:19

jtmtv18

16-May-03 8:19

thanks for the code...ill have to work on it tonight =)...anywho...is getHexColorString , getTextSizeFromFont a function you wrote ? what do those functions do if so ?

thanks

Jesse M

The Code Project Is Your Friend...

Re: reqaurding rtf boxes

KingTermite16-May-03 12:59

KingTermite

16-May-03 12:59

Yes, getHexColorString and getTextSizeFromFont are my own methods. Sorry...had I realized I had left them in, I'd have taken them out so as not to confuse you.

getHexColorString() takes the current char, determines the color and returns the number representing the color as a hexadecimal string (e.g. black text would return "000000").

getTextSizeFromFont() gets the font size and determines which HTML text size most closely matches it.

As you may have guessed, what I'm writing is something similar (but not quite) like an RTF2HTML conversion program.

There are only 10 types of people in this world....those that understand binary, and those that do not.

Re: reqaurding rtf boxes

jtmtv1816-May-03 14:00

jtmtv18

16-May-03 14:00

Well i got the code to work perfectly...but perhaps you could help me optimize it ? it is incredibly unefficent....because it moves char by char...and each time it changes the font / color of that char it has to update the hole rtf box. if i could find away to do all this work in memory...the speed increase would be incredible. The following code seems to work good....but any ideas on how i can perform the same actions in memory?

int iIndex = 0;<br />
				int SelSt = GetMainFormData.MainTextArea.SelectionStart;<br />
				Color[] jr = new Color[GetMainFormData.MainTextArea.SelectedText.Length];<br />
				Font[] fr = new Font[GetMainFormData.MainTextArea.SelectedText.Length];<br />
				//<br />
				//MessageBox.Show(GetMainFormData.MainTextArea.SelectionStart.ToString());<br />
				//<br />
				int tmp = GetMainFormData.MainTextArea.SelectionLength;<br />
				GetMainFormData.MainTextArea.Visible = false;<br />
				while ( iIndex < (tmp) )<br />
				{<br />
					// Go one char at a time<br />
					GetMainFormData.MainTextArea.Select(SelSt,1);<br />
					if (null != GetMainFormData.MainTextArea.SelectionFont)<br />
					{	<br />
						fr[iIndex] = GetMainFormData.MainTextArea.SelectionFont;<br />
						Font tmpF = (Font)fr[iIndex];<br />
						if(tmpF == fd.Font)<br />
						{<br />
							GetMainFormData.MainTextArea.SelectionFont = fd.Font;<br />
						}<br />
						else if(tmpF != fd.Font)<br />
						{<br />
							Font fonf = new Font(tmpF.FontFamily,fd.Font.Size,fd.Font.Style);<br />
							<br />
							GetMainFormData.MainTextArea.SelectionFont = fonf;<br />
						}<br />
					}<br />
					if (true != GetMainFormData.MainTextArea.SelectionColor.IsEmpty)<br />
					{<br />
						jr[iIndex] = GetMainFormData.MainTextArea.SelectionColor;<br />
						GetMainFormData.MainTextArea.SelectionColor = jr[iIndex];<br />
					}<br />
					SelSt++;<br />
					iIndex++;<br />
				}

Jesse M

HiWord/LoWord/etc in C#

J. Dunlap14-May-03 19:33

J. Dunlap

14-May-03 19:33

What are the C# equivalents of the C/C++ HIWORD/LOWORD/HIBYTE/LOBYTE macros? In VB6 I had to write my own, but surely C# must have them.

"Do unto others as you would have them do unto you." - Jesus

"An eye for an eye only makes the whole world blind." - Mahatma Gandhi

Re: HiWord/LoWord/etc in C#

cdehelean15-May-03 4:49

cdehelean

15-May-03 4:49

static int HiWord(int Number)

{

return (Number >> 16) & 0xffff;

}

static int LoWord(int Number)

{

return Number & 0xffff;

}

All I need is a roadmap and then I might be able to find a clue.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.