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Hi,
I don't know and never had a need to know either. Are you aware of Graphics.MeasureString()?
it calculates the size a Graphics.DrawString() action would require.
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I have not said anything about measuring strings.
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Hello,
I have an application that reads XML files containing coordinates of text and graphics objects (lines, arrows, etc...). The coordinates are in units equal to (font height) / 8. In my override of Control.OnPaint(), I include a line like this to change the PageScale property of the Graphics object passed in to the function.
float font_height = Font.GetHeight(e.Graphics);
e.Graphics.PageScale = font_height / 8;
This works as expected in that Graphics.PageScale is set to approximately 2.8 and all of the calls to the drawing and text ends up at the coordinates read from the XML files multiplied by 2.8.
The problem is in my override of OnMouseMove. I need to change the color of these lines and text as the user passes the mouse over them. Since there is not a Graphics object passed into OnMouseMove I create one using Control.CreateGraphics(). The problem is that even though I change the PageScale property to the same value as in OnPaint, the drawing functions do not recognize the new scaling factor. In the debugger I can see that the value of PageScale has been successfully changed.
Has anyone run into this problem or am I doing something wrong?
Thanks.
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CreateGraphics is probably fine to use in a mouse event, as you don't want what is drawn to persist, but I tend to stick to calling Invalidate() to force a paint event.
Christian Graus
Driven to the arms of OSX by Vista.
"Iam doing the browsing center project in vb.net using c# coding" - this is why I don't answer questions much anymore. Oh, and Microsoft doesn't want me to.
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I've a third party DLL that exports this function:
typedef UCHAR (__cdecl *RESPONSE_FUNC)(UCHAR eventID);
__declspec(dllimport) void SetCallback(RESPONSE_FUNC pfResponse, UCHAR* responseBuffer);
I must allocate the buffer, call the SetCallback function, and read the modified data when the callback function is called.
I tried with this code:
static byte[] responseBuffer = new byte[10];
delegate bool RESPONSE_FUNC(byte eventID);
[DllImport("mydll.dll", CallingConvention=CallingConvention.Cdecl)]
private static extern void ANT_SetCallback (RESPONSE_FUNC callback, byte[] responseBuffer);
public void test
{
ANT_SetCallback (EventCallback, responseBuffer);
}
static bool EventCallback(byte eventID)
{
return true;
}
When the dll doesn't try to modify the buffer then the Callback function is called without errors(the first event doesn't access the buffer).
But when the DLL tries to modify the data in the buffer, the program crashes with a 0xc0000409 exception.
I'm stuck on this, any suggestion ?
modified on Sunday, November 9, 2008 1:01 PM
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This
typedef UCHAR (__cdecl *RESPONSE_FUNC)(UCHAR eventID);
should be
typedef UCHAR (<code>__stdcall</code> *RESPONSE_FUNC)(UCHAR eventID);
Also, make sure you pass a buffer large enough to accomodate whatever
writing the DLL is doing in it 
Mark
Mark Salsbery
Microsoft MVP - Visual C++
![Java | [Coffee]](https://www.codeproject.com/script/Forums/Images/coffee.gif)
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Mark Salsbery wrote: This
typedef UCHAR (__cdecl *RESPONSE_FUNC)(UCHAR eventID);
should be
typedef UCHAR (__stdcall *RESPONSE_FUNC)(UCHAR eventID);
It's a third party library, I'm not able to change it 
And yes, I'm sure the buffer is bigh enough... it should be 3 bytes, I'm passing 10 
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Paolo Vernazza wrote: I'm not able to change it
Oops, sorry.
On the C# side...
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
delegate bool RESPONSE_FUNC(byte eventID);
Mark
Mark Salsbery
Microsoft MVP - Visual C++
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hi evryone
how can i send text from my C# program to external program ?
i need to send text where the cursor is at this moment
than'k alot for any help
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What do you mean by sending text? If you want to send a message you can P/Invoke SendMessage() function. If you mean interprocess communication, than you can use pipes or remoting.
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i'll try to explane
i have my program, i need to send text from my program to any open
program (word for example) where the cursor is blinking
how can i send my text to external open program in the cursor position
than'k alot
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Process.StandardInput -> MSDN
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Haha! Yeah, I like that one! Process.StandardInput -> MSDN
Nice...
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what's the different when we run an application with .exe file and debug mode?
thanks
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That's a very wide question. Are you looking for the internals of how the debugger hooks up the executable, the difference in performance for the application or what you do to accomplish debugging?
Despite everything, the person most likely to be fooling you next is yourself.
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i meant the difference in performance?
Do they give the same errors?....
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Code compiled in debug mode contains a lot of extra NOP (no operation) instructions, so that there is always at least one instruction per source code line, in order for the debugger to be able to place a breakpoint on any line.
The compiler doesn't optimize the code by rearranging any instructions when compiling for debug mode, so that the compiled code exactly resembles the source code, in order to be able to single step through the code.
Exceptions takes a lot more time to handle when the code runs in debug mode.
The garbage collector works differently in debug mode, expanding the usage of variables to their entire scope, so that you can view the values of the variables in the debugger as long as they are in scope, even if the object is actually unused and could have been collected.
As the compiled code differs slightly, any race conditions or other timing problems that exist in your code may only occur in debug mode or only in release mode.
Despite everything, the person most likely to be fooling you next is yourself.
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Hi..
How to find parent's child in matrix (in maze)?
please more describtion for me...!
thanks.. 
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What the hell are you talking about ?
Christian Graus
Driven to the arms of OSX by Vista.
"Iam doing the browsing center project in vb.net using c# coding" - this is why I don't answer questions much anymore. Oh, and Microsoft doesn't want me to.
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Maybe, just maybe, we'll know when some one adds more describtion...
Anyway parents dropping their children into a maze seems a tad irresponsible to me.
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sitnet wrote: How to find parent's child in matrix (in maze)?
please more describtion for me...!
Electronic tagging would be a good start, or possibly a really long lead with a motorised winder to reel that kid right back in.
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I'm playing with my first C# application and have a few questions about style. Bear with me here; I've been programming about 100 years, but I'm fairly new to the Windows environment, and a total newbie in C#.
I'm working on an app that is intended to allow unskilled people to enter information about electrical substations. The four functions to be supported are: entering the equipment readings for several classes of equipment each month, recording services performed on the equipment, recording the movement of equipment within substations and inventory, and managing inventory. I've built Windows Forms for each of the basic functions, but now wonder how to proceed.
My first thought was to create a sequence of dialogs launched from each major function page to collect data and post it to a database. Then it occured to me that I might also embed data collection forms into the main pages and play with the visibility of each as I walked the user through the steps. Another option would be to create individual forms for each step and just overlay them as the user navigates through the steps. I'm trying to create a uniform appearance so as to make the app friendly to people who don't like to use computers, but since I'm new to the language and environment, I'd also like to save myself a lot of unnecessary pain. I don't want to lock myself into a solution that will require advanced knowledge of the language that I lack.
What would you recommend? Any suggestions would be appreciated...
"A Journey of a Thousand Rest Stops Begins with a Single Movement"
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