Attempted to read or write protected memory , Resources.Image

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Hello!

I develope in C# , manged code ,IDE vs2010.

I received the follow exception:

"Attempted to read or write protected memory.this is often indication that other memory is corrupt"

I recived this error when I try to change button image from resources.

code :

statusButton.Image=Resources.Status_Ok;

Or

statusButton.Image=Resources.Status_Fail;

The exception is not appear all the time!!.

The command is fetch by timer [System.Timers.Timer].

it's make me crazy ....

Thanks!
M.A.K

Posted 28-Jul-15 5:34am

ABAKADABRA

Updated 28-Jul-15 5:36am

v2

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Comments

Sergey Alexandrovich Kryukov 28-Jul-15 11:43am

Not enough information. You must be doing something nasty, but not in the lines shown.
—SA

[no name] 28-Jul-15 14:52pm

O.K ,you catch me...
In background I use driver that I wrote for pooling data from pci-e card via DMA,
If I run only the driver w/o to update the GUI status I can run for hours/days the only problem start only when I try to update the button image [update other thing like label , text etc' is o.k] .

2 solutions

Solution 2

It simply say that resources are off limit for modifications.
You are not allowed to do this as long as the image is in the resources.
Try to copy it in a variable.

Posted 28-Jul-15 9:13am

Patrice T

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OriginalGriff · Accepted Answer · 2015-07-28T05:48:00

Solution 1

Start by loading the two Images into class level variables in the Load event, and use those to set your button image in the timer Tick event - at the moment, you are creating new images each time you set it which may be the problem.

Posted 28-Jul-15 5:48am

OriginalGriff

Comments

[no name] 29-Jul-15 1:33am

Like I say ,
In background I use driver that I wrote for pooling data from pci-e card via DMA,
If I run only the driver w/o to update the GUI status I can run for hours/days the only problem start only when I try to update the button.
Your answer solve my current error , it's move it to another place , I still recived
the same exceptin in other places in my code....
May you have any technique for recognize the source of the memory problem.
Thanks!
Moti

OriginalGriff 29-Jul-15 1:46am

We can't really help you with that because we can't see - and more importantly run - your code.
So start by looking for places where you do "silly things": creating images a lot, using Graphics contexts and not disposing of them, DB connections or commands without disposing them, anything that uses resources. And check your "driver" - it's quite possible that it's causing the problem but it shows up elsewhere.
Sorry to sound vague - but we have no idea how your software works, so vague is the best we can manage with a "general" problem like that! :laugh:

[no name] 29-Jul-15 3:47am

The problem solved.
Bad marshal operation.
When I recived data from the pci-e card I also write the data into H.D for each buffer I add header , the header is convert from struct to byte array .
I use the function :

Marshal.StructToPtr(struct,_headerPtr,false);
public static void StructureToPtr(Object structure,IntPtr ptr,bool fDeleteOld)

fDeleteOld

true to call the Marshal.DestroyStructure method on the ptr parameter before this method copies the data. The block must contain valid data. Note that passing false when the memory block already contains data can lead to a memory leak.

So I cahnge it to true and that solve the problem.

Thanks.
M.A.K

OriginalGriff 29-Jul-15 3:52am

Glad to hear it! :thumbsup: