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You should be able to do it by looking at the raw data bytes. This is more complicated than GetPixel(), but the System.Color structure definitely only supports 8bpp. The upside is that this method can be a lot faster than calling GetPixel thousands of times.
To get at the raw data for a System.Drawing.Bitmap you first have to lock the bits (so the array doesn't move around in memory while you're doing unsafe pointer stuff), then you can get a pointer to the start of a particular scan line, which will be a pointer to the raw array of bytes for that scanline. All of this requires the "unsafe" keyword, which requires a special compiler flag.
Inside the unsafe { ... } block, first call LockBits() on the Bitmap to get a BitmapData structure. Then you can use the Scan0 property of the BitmapData to get a pointer to the first scanline. In your case you would cast this to a (ushort*) type, since each 16bit value is a ushort. Incrementing the pointer will point to subsequent ushort's on the same scanline.
To get to the next row (scan line) of the image, add the value of the Stride property of the BitmapData to the Scan0 value to get the pointer to the start of the second scan line.
I don't have a 48bpp image to try this on, but here's some code for a 32bpp image which you can use as a starting point:
using (Bitmap bmp = new Bitmap("image.tif"))
{
int[,] raw = new int[bmp.Width, bmp.Height];
Rectangle rect = new Rectangle(0, 0, bmp.Width, bmp.Height);
unsafe
{
BitmapData data = bmp.LockBits(rect,
ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);
int max = int.MinValue;
byte *p = (byte *) data.Scan0;
for (int y = 0; y < bmp.Height; y++)
{
byte *q = p;
for (int x = 0; x < bmp.Width; x++)
{
byte red = *(q++);
byte grn = *(q++);
byte blu = *(q++);
raw[x, y] = blu + 256 * grn + 65536 * red;
}
p += data.Stride;
}
bmp.UnlockBits(data);
}
}In your case you'll want ushort instead of byte everywhere, and you wouldn't be saving the pixels as 32-bit ints of course, but the logic is the same. It's also possible that I have the red/blu values backwards here, but you can figure that out.
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When I process this event, it gets called multiple times per page. Why is this? How can I stop it, or should I use another event?
Sammy
"A good friend, is like a good book: the inside is better than the cover..."
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Are you trying to detect when the page has loaded? try the body.onload event, but be aware that this will only fire when all of the content has downloaded (images etc.). You could also put a call to your function in tags at the bottom of the page if you want it to fire when the html is downloaded.
Find my .Net blog at <a href="http://hiltong.blogspot.com">http://hiltong.blogspot.com</a>
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body.onload is not exposed via the mshtml interface. I have an AxWebBrowser component inside my Windows Forms project. That's where the event is hooked.
Sammy
"A good friend, is like a good book: the inside is better than the cover..."
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It fires because the page your loading supports frames. The event will fire when the frame page is done loading (usually the one your navigated to), and it also fires for each subpage that the frame page loads.
This behavior is by design. You can't turn it off.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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I have a third party source code in C which i have converted into a win32 dll.
namely have introduced a new entry point to replace main
__declspec(dllexport) int maindllentrypoint(int argc, char* argv[])
Now i try to invoke it from a c# console application
[DllImport
("D:\\.............\\xxxx.dll")]
public static extern int maindllentrypoint(int argc,string[] argv);
class ClsInvokeThirdParty
{
[STAThread]
static void Main(string[] args)
{
string[] prm=new String[]{="xxxx.exe -c d:\\..\\tihrdparty.conf -l d:\\dlllogs.txt"};
ClsInvokeThirdParty.maindllentrypoint(1,prm);
Console.WriteLine ("Press enter to abort ");
Console.ReadLine();
}
}
I get a NullRefernceException-Object reference not set to an instance of an object..
When I debug into the third part code ,I find that the program aborts atthe first pace that argv[0] is being referenced within the dll.
What should I do?
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First, never hard-code the path of the DLL. This will most likely be in a different location on different machines. Just specify the DLL name and make sure that it's location is specified in the PATH environment variable (or add it to a directory that's already in the PATH).
Also, it seems that all you're trying to do is invoke an executable, so why not just use Process.Start, which allows you (through various means) to invoke an executable and pass it command-line parameters.
Microsoft MVP, Visual C#
My Articles
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The executable needs to be built into a dll,to map into our process space.
This is needed owing to certain organizational practices.
But I need help in sending a pointer to character array from managed code -something which the main function(and hence the correponding dll entry point clone that i set up) expects .
Any help would be much appreciated.
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You map a DLL in your process space just to execute an application (out-of-process)? Odd, but whatever.
See the MarshalAsAttirbute class in the .NET Framework SDK. Since you're using char* and not TCHAR*, be sure to specify CharSet=CharSet.Ansi in your MarshalAsAttribute and to use the right UnmanagedType enumerations to declare it like so:
[DllImport("xxx.dll", ExactSpelling=true, CharSet=CharSet.Ansi)]
private static extern int main(
int argc,
[MarshalAs(UnmanagedType.LPArray, SizeParamIndex=0,
ArraySubType=UnmanagedType.LPStr)] string[] argv);But what's the point of sending an array (marshalling it is slower) if you're just going to pass a single string? All you're doing is wrapping CreateProcess or something (which is a waste since Process.Start encapsulates that already) so why not just declare a function that takes a string argument?
Microsoft MVP, Visual C#
My Articles
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to stop it returning 1/1/1 if the user does not enter a date into the textbox then i want my database table to show no date entered?
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You cant assign null to a value type in .net. You can only assign null to references.
Best way to handle this would be to compare with DateTime.MinValue.
It's yet another shock to our system to discover that not only are we not the centre of the Universe and we're not made of anything, but we started out as some kind of slime and got to where we are via being a monkey. It just doesn't read well.
Douglas Adams
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many thanks that worked a treat passed DateTime.DbNull.Value
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HI~
Is there any function in eVC++ which can pass some parameters to a running C# program?
"CreateProcess" can pass some parameters as a argument when a process start. However, how about the process is running?
Thanks~
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There's many ways. You could expose your .NET components as CCWs (COM-Callable Wrappers) and communicate with them that way (most likely using the Running Object Table - or ROT - to get the running instance, but any singleton pattern will do).Read my article Embedding .NET Controls in Java[^] for an example (ignore the Java stuff; pay attention to how the C++ bridge marshals calls on the .NET Control exposed as a CCW). Also read Nick's article, Creating a CCW for COM-Enabled, non-.NET Applications[^].
You could use DDE, though adding support for this archaic API to .NET is cumbersome (but I do believe I've seen an article here on CP that may help).
You could use any IPC (inter-process communication) mechanism, such as - but not limited to - .NET Remoting (easy to implement on the .NET side, but forces you to parse and create XML fragments and post them to a TCP channel, for example, yourself in eVC++, interop'd IPC functions from the Win32 API (at least whatever is supported by eVC++ for the Windows Mobile architecture), etc.
Microsoft MVP, Visual C#
My Articles
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Hi , anyone know if it is possible to somehow match a regex pattern at an exact index?
eg:
string text="abc 0xffaabb def ghijkl";
regex r=new regext ("0x[0-9a-f]+");
match m=r.match (text,4); //<-- i want to match at position 4 ONLY , not 5,6,7,8 or anything else , only on index 4
[edit]
ofcourse i can check if the match object returned is located at the same index, but that would lead to seriously bad performance since the whole string will be scanned. i need it to check on the index only..
[/edit]
the length param is apparently not for this , it only limits how long the result can be , and i dont know that in advance , it can be any length
//Roger
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You can't match only at index 4 with a search result of 3+ length. That doesn't even make sense. Yes, the match starts at index 4, but is not limited to only index 4.
There is a Match(string, int, int) method that may help if you have some idea of a maximum length of a hex number (depending on the bit-length of the numeric type you're checking for.
You might also consider not using regular expressions for this very simple search. The String class has many methods that can help you parse this string that would be much faster, especially if you're not compiling the regular expression (thus it must be compiled each time it's used - very slow comparitively).
Microsoft MVP, Visual C#
My Articles
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well the expression here was just a sample , it can be any regex.
i just want a fast way to verify if the text at a given index matches a regexpattern , no matter how long it is.
//Roger
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Ive found the solution for the problem ,
I simply needed to add a "\G" in the beginning of my regex , this will make the regex engine only match at the given index 
//Roger
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i hav a problem using the splitter.I hav tried to use it with panels and the splitting doesn't occur properly..For the form I added 3 panels. A base panel, a top panel and a bottom panel. i want to add a splitter between the top and bottom panels so that when u click and drag the panels should resize. How can I achieve this?
samitha
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Using the designer, you have to add these in the right order. For example using a Windows Explorer-like layout, add a Panel and dock it to the left side. Add a Splitter. Now add another Panel and set the Dock property to DockStyle.Fill (just "Fill" in the designer).
If you look at the code, you'll notice that the TabStops are 0, 1, and 2 respectively. The order in which these controls are added (the most important part; the TabStop in the designer determines this order but they don't have to match) is reversed:
this.Controls.AddRange(new Control[] {
this.panel2,
this.splitter1,
this.panel1});Why they're reversed has to do with the way AddRange works internally.
Replicate this in your code and you should be fine. If nothing else, try throwing together a new project and layout the Panels and Splitters in order the way you want them. Be sure to examine the code, however, to know what's being done by the designer.
Microsoft MVP, Visual C#
My Articles
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Hi, I want to use Outlook to send a e-mail in my code.
I have created a class library for this already.
When I run this in a Windows App., it works OK. But if I run this
as a Windows Services, I got an exception in the CreateItem line:
//Code start..
Outlook.MailItem mailItem;
mailItem= (Outlook.MailItem)app.CreateItem(Outlook.OlItemType.olTaskItem);
//..Code end
_COMPlusExceptionCode -532459699
_source "Microsoft Outlook"
_className null
_exceptionMethod null
_exceptionMethodString null
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The service has to be able to run in a desktop session. In the Services control panel, find the service, open it's properties, and select "Allow this service to interact with the desktop". Alternatively, you can run the service as a specific user, but it will always run as that user and, thus, email will be addressed from him or her.
If you want to send email from a service, I recommend you implement an SMTP client yourself. For the basics, it's really very easy. Just click "Search comments" above and search for "SMTP" or something. I know that I've posted code snippets several times in the past and you can always search google[^] for more.
Microsoft MVP, Visual C#
My Articles
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I use the control to design a window form with the DotNet pattern.I want my form to be the similar to toolbox and solution explorer,which can hide when you push the AutoHide and display when the cursor pass it.And with MagicLibrary I succeed.But I still have a problem.
The toolbox or solution explorer is so agile that an ordinary customer can not be used to it.The key is it is very difficult to put the solution explorer into its original position after a customer pulls it out. So I really want to know how I can make the solution explorer fixed to its initial position.Just like the fields "anchor".
If you know the solution,please mail to me :"w2520n2520@hotmail.com".
Thank you!
Never understand
ridical version!
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What is "MagicLibrary" supplied by codeproject?
Is it something that appeared in an article? If so you should use the forum at the bottom of the article's page.
"If a man empties his purse into his head, no man can take it away from him, for an investment in knowledge pays the best interest." -- Joseph E. O'Donnell
Can't manage to P/Invoke that Win32 API in .NET? Why not do interop the wiki way!
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