Dll Import - C# Discussion Boards

Re: dynamically add a flash object to a C# desktop application

led mike26-Feb-09 4:34

led mike

26-Feb-09 4:34

Zap-Man wrote:
Also I need the background to be transparent and having troubles with this too.

Your previous posting of this question already received an answer to that question.

Zap-Man wrote:
I come up with unhandled win32 exceptions.

Perhaps posting the exception message along with the relevant code that creates the exception might help people have some idea what the problem is. AFAIK, the members of this site are just normal humans, without any clairvoyant powers.

Re: dynamically add a flash object to a C# desktop application

Zap-Man26-Feb-09 5:05

Zap-Man

26-Feb-09 5:05

yep your right but the response did not answer my question. and if you were to read what I posted you could see that I did post with relevant code. I'm unsure of what creates the exception. its a generic error and leads to nothing to help be debug the problem.

I was hoping that maybe someone else has done somthing like this or knows of any links that my help!

Re: dynamically add a flash object to a C# desktop application

EliottA26-Feb-09 5:42

EliottA

26-Feb-09 5:42

Zap-Man wrote:
and if you were to read what I posted you could see that I did post with relevant code

Maybe in your other post (I haven't checked) but not in this one. I don't know what the hell you did or how you went about doing it. I'd listen to the other reply and heed his/her advice.

Check out the CodeProject forum Guidelines[^]

Re: dynamically add a flash object to a C# desktop application

led mike26-Feb-09 7:11

led mike

26-Feb-09 7:11

EliottA wrote:
his/her advice.

LMAO!

You're new round here eh? Welcome Beer | [beer]

Re: dynamically add a flash object to a C# desktop application

led mike26-Feb-09 5:48

led mike

26-Feb-09 5:48

Zap-Man wrote:
but the response did not answer my question.

Really?

Christian Graus wrote:
A flash control is not going to draw itself transparently, ever.

That's not an answer? Whatever. Good luck.

create user and role + sql server for existing database programatically

vineesh v26-Feb-09 3:19

vineesh v

26-Feb-09 3:19

how to create user and set sql authentication for an existing data base programatically using c#

Re: create user and role + sql server for existing database programatically

Jimmanuel26-Feb-09 4:04

Jimmanuel

26-Feb-09 4:04

take a look at SQL Server Management Objects[^]

Dll Import

Alessio Granzotto26-Feb-09 3:13

Alessio Granzotto

26-Feb-09 3:13

Hi,
I have this function in a DLL.
long MatchPage (long hImage, long hTemplateList, long *hMatch, char *szTemplate, long iMinMark, long bRegister, long *iConfidence);

Purpose
Match a filled form image to a Template from a Template List.

Parameters
hImage
Image handle of filled form
hTemplateList
Handle of the Template List.
hMatch
Handle of a Match which can be used later by JIRegionsRecognize. The handle should be free later by JIMatchFree.
szTemplate
Template file name is returned here. File name is returned without path and without file name extension.
iMinMark
Minimal confidence for a match. Legal values are 0-100. Recommended value is 15.
bRegister
If 1, the registered image is returned in hImage if matching achieved.
iConfidence
Confidence of the Match.

Import in this way:
[DllImport("image.dll")]
public static extern long MatchPage(IntPtr hImage, IntPtr hTemplateList, out IntPtr hMatch, [MarshalAs(UnmanagedType.LPStr)] StringBuilder szTemplate, long iMinMark, long bRegister, out IntPtr iConfidence);

...and call in this way:
rc = (int) MatchPage(hImage, hTemplateList, out hMatch, matchingTemplate, 25, 1, out iConfidence);

but the compiler says:"Access Violation" .
Someone can help me please?
TY

Re: Dll Import

Luc Pattyn26-Feb-09 9:18

Luc Pattyn

26-Feb-09 9:18

Hi,

Some of it looks good, some is less clear. It is always difficult to pinpoint what exactly is wrong; I tend to (1) keep data exchange simple and (2) add logging code on both sides, so I can see which arguments get accross correctly and which don't.

I do have 2 comments:

1.
a native long* can be passed as a managed out long or ref long, it does not need an IntPtr at all. The way your template has it, it is promising the managed world will receive an output pointer, which then natively would require long**
Chances are this is what is causing the error.

2.
I just don't know about szTemplate, I never use [MarshalAs(UnmanagedType.LPStr)] StringBuilder. I prefer a more verbose but easier to understand style as in:

[DllImport("image.dll")]
public static extern long MatchPage(..., StringBuilder szTemplate, ...);

StringBuilder sb=new StringBuilder(1000); // make sure to set initial capacity
MatchPage(..., sb, ...);
string s=sb.ToString();

You must set an initial capacity, that is the size used to allocate the character buffer; and the safe way is to pass that Capacity to the native world so it won't overflow the buffer (similar to strncpy).

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

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modified on Sunday, June 12, 2011 8:42 AM

Re: Dll Import

Alessio Granzotto27-Feb-09 0:42

Alessio Granzotto

27-Feb-09 0:42

Hi Luc,
you are very kind.
I think that the problem is not in the string, in another case the StringBuilder work fine. The problem is in the Ptr.
hImage comes from:
[DllImport("justicr.dll")]
public static extern long JIImageFileOpen(out IntPtr hImageFile, [MarshalAs(UnmanagedType.LPStr)] StringBuilder szFileName, long bWrite);
[DllImport("justicr.dll")]
public static extern long JIImageFileRead(IntPtr hImageFile, out IntPtr hImage);

rc = (int)JIImageFileOpen(out hImageFile, fullname, 0);
rc = (int)JIImageFileRead(hImageFile, out hImage);
rc = (int)JIImageGetInfo(hImage, out IWidth, out IHeight, out IResolution, out IBytesPerLine, fileName, out iPage);

and it works because JIImageGetInfo works.

and hTemplateList from:
[DllImport("justicr.dll")]
public static extern long JITemplateListCreate(out IntPtr hTemplateList);
[DllImport("justicr.dll")]
public static extern long JITemplateListLoad(IntPtr hTemplateList, [MarshalAs(UnmanagedType.LPStr)] StringBuilder szTemplates);

rc = (int)JITemplateListCreate(out hTemplateList);
rc = (int)JITemplateListLoad(hTemplateList, listaCompleta);

which is for you the problem in JIMatchPage???
ty very much

Re: Dll Import

Luc Pattyn27-Feb-09 1:36

Luc Pattyn

27-Feb-09 1:36

Hi Alessio,

I didn't realize, you and I had an earlier dialogue, and my message then ended on "Now the tricky part could be what comes next: how will managed code access the content of the image?". So that is what we are trying to do now Laugh | :laugh:

As I already said above, I don't trust or don't like the out IntPtr stuff. Let me expand on that: either you have data allocated by the managed world and you want to pass it (or a pointer to it) to the native world, so you probably would need the fixed keyword and no IntPtr, or the GCHandle class and no out/ref keywords. Or the memory gets allocated by the native world, and then the managed world must somehow either (1) adopt the thing as if it were a managed object (which it is not), or (2) create an object and copy all the data (which I typically don't like). AFAIK you will need to call some of the Marshal methods explicitly, however I can't provide any details, I never did such things since most Win32 API calls don't need it, and when I can choose (because the native code is mine too) I keep the data marshaling simple and try to allocate objects always on the managed side.

"Now the tricky part could be what comes next: how will managed code access the content of the image?"

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

modified on Sunday, June 12, 2011 8:42 AM

TableLayoutPanel cell removal problem after shuffling it's controls

Muammar©26-Feb-09 2:24

Muammar©

26-Feb-09 2:24

I have a table layout control with buttons in it's cells, if you click a button, it is supposed to disappear by setting its Visible property to false and it works fine, however, when I try to reposition the buttons in the table and click on the buttons, they do disappear but dragging the next button in the next cell to fill it's place and leave the last cell of the table empty! Beforehand, it used to disappear leaving it's cell empty and somehow I dont seem to have this facility anymore!

Please help!

All generalizations are wrong, including this one!
(\ /)
(O.o)
(><)

Re: TableLayoutPanel cell removal problem after shuffling it's controls

Muammar©26-Feb-09 8:46

Muammar©

26-Feb-09 8:46

Ok, I solved it by setting controls size to Size(0,0) instead of hiding them, I know it's not a correct solution but it works fine with me!

All generalizations are wrong, including this one!
(\ /)
(O.o)
(><)

Forms / Controls flicker during generation.

MatthysDT26-Feb-09 2:23

MatthysDT

26-Feb-09 2:23

I have a project that dynamically displays the selected form/control in another Forms splitContainer panels, either left or right etc.

Problem I had when running this code was that the form/control within the splitContainer doesn't resize and get's cut-off when the main app resizes. This I fixed by calling the .Show() of the internal Form, BEFORE adding it to the splitContainer, now it resizes just fine! But since the control is being shown before it's done generating, it creates a flicker effect in which you can see for a millisecond how the controls are generated and placed, and it doesn't look very professional.

This was a mouthful, but if you understand where I'm coming from, and maybe know where I should go, please let me know!

I'd also like to mention that the Form containing the splitContainer is itself located within an MDI Parent.

Regards!

Doggy treat[^]

Re: Forms / Controls flicker during generation.

#realJSOP26-Feb-09 3:00

#realJSOP

26-Feb-09 3:00

Try turning on double buffering for the form.

"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001

Reccomended books on SQL server 2008

Mohsen Saad26-Feb-09 1:57

Mohsen Saad

26-Feb-09 1:57

Hi all,

I used to build databases with MS Access and I need to learn SQL server 2008

what books do you recommend for SQL server 2008

Re: Reccomended books on SQL server 2008

Calin Tatar26-Feb-09 2:10

Calin Tatar

26-Feb-09 2:10

Beginning SQL Server 2008 for Developers: From Novice to Professional[^]

process extension

shefa' isied26-Feb-09 1:39

shefa' isied

26-Feb-09 1:39

hi,
how i can catch the processes of other types rather than .exe and .dll using c#?
Process[] p=Process.getprocesses();//return only .exe and .dll files

Re: process extension

EliottA26-Feb-09 2:07

EliottA

26-Feb-09 2:07

I don't understand, those are the processes that are running, what do you see differently when you press crtl-alt-del?

Other files, .doc, .jpg, .cs have an association with an executable to display the contents of those files, so they are not processes, but files that open a process to show their content.

Check out the CodeProject forum Guidelines[^]

Re: process extension

Calin Tatar26-Feb-09 2:33

Calin Tatar

26-Feb-09 2:33

you may get the hidden processes (windows services) by using:

ServiceController[] services = ServiceController.GetServices();

Calin

How to split a datatable??

Member 455443326-Feb-09 1:24

Member 4554433

26-Feb-09 1:24

Hi all,

I need to split a SELECT QUERY fom a database (which i put in a DataTable) from this:

DataTable1
0
1
2
3
4
5
6
7
8
9
10
0
1
2
3
4
5
6
7
8
9
10
0
1
2
3
0
1
2
0
1

To this:

DataTable1
0
1
2
3
4
5
6
7
8
9
10

DataTable2
0
1
2
3
4
5
6
7
8
9
10

DataTable3
0
1
2
3

DataTable4
0
1
2

DataTable5
0
1

How can i do that?? Smile | :)

Re: How to split a datatable??

moon_stick26-Feb-09 2:54

moon_stick

26-Feb-09 2:54

It's less that 4 hours since you last asked this question.[^]

Was there something wrong with the coded example you were given there? Maybe you should try solving the problem yourself first, rather than expecting someone else to do it all for you?

It definitely isn't definatley

Transform Excel to PDF

abbd26-Feb-09 0:30

abbd

26-Feb-09 0:30