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If I open up an image in an MFC application, how can I get the pixel value of the picture that the mouse is pointing at?
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get current mouse pointer position, and then call
COLORREF color = GetPixel(hdc,x,y);
the value of color is what you want.
it's easy , is it?
good luck
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I am developing a 3D program with DirectX 7.0 SDK. When I have rendered some objects in a 3D scene, I need pick the oject accurately in the scene via my mouse position on the screen. I need your help, and in the fact, I need some source codes. Help!
stanley
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Basically, you can compute the equation for a line between the eye and the near plane at the X,Y location that the user clicked. Then shoot the ray from the eye through the near plane and see what object it intersects.
There are many other methods around. Places like http://www.gamedev.com/ and http://www.flipcode.com should have information on how to do this. Common problem in games.
Tim Smith
I'm going to patent thought. I have yet to see any prior art.
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I've searched google groups but all I find is "that cant be done". Well, of course it can - and one of you know how to do it.
When you map a network share as a drive, it will be called
[sharename] on [servername] ( n: )
- by default. (n being the drive letter)
If you select properties on a mapped drive, you can change that label to anything, e.g. to "documents" in the "Label:" edit field. (only on w2k, winXP), but since I map my drives from a batch-file being run at each startup, I wan't to change that name programatically. All vb-script offers (don't laugh, please...;P) is ShareName and VolumeName, which are both read-only and respectively e.g. \\server\share and "datadrive2" (that is, the name of the harddisk-partition on the server... why the heck is that visible ???) - so I probably have to write a small exe that can do the job.
Has anybody tried this ? Or do anybody have a good idea how to find out how it's done ? Maybe I'm just searching the wrong places...
Well, any help will be much appreciated - thanks a lot in advance.
/Jan
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I have two signals (for example two voice signals) . And i need to put them one by one, and smooth (or interpolate) possible differences between the end of first signal, and start of another one ..
How can i handle with it ?
Thanks in advance .
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That depends on the relationship between the two signals. Are they partially overlapped, sequential with a fixed or variable delay between them, or sequential with no delay (first sample of a given stream is one sample after the last sample of the prior stream)?
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It's most close to the "partially overlapped" signals ..
so what can you propose to me ?
thanks
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The answer is simple, but I don't want to lead you down the wrong path. More information is needed to determine the correct solution. When you say it's "most close" to partially overlapped, what do you mean? You said this is DSP, so I assume that you're receiving chunks of buffer from an input source. If that is the case, you shouldn't need to worry about overlap or delay between the buffers, and a blunt join of the buffers would be appropriate and wouldn't cause a pop in the audio stream since the two buffers are chunks of a uniform stream. If you have two audio files from independent sources which you wish to connect, or wish to transition from one live audio source to another while receiving data streams from both, then do a linear crossfade as Tim Smith indicated. At the beginning of the fade, the audio source to be faded out is at full volume, the one to be faded in is at zero volume. At the midpoint of the fade, each audio source is at half-volume. At the end of the fade, the one fading out is at zero volume and the one fading in is at full volume. The multipliers go from 1.0 to 0.0 and from 0.0 to 1.0 linearally. Just multiple each sample across the fade by the multiplier for that buffer, and add it to the sample from the other buffer times its multiplier. At each sample, the sum of the two multipliers is 1.0 (full volume).
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I wouldn't worry about it. A 44khz sample rate is trying to handle signals up to 20khz. At 20khz there aren't going to be many samples per complete wave. If you wanted to, you could do a linear interpolation between the two signals for maybe 2-4 samples. That would be plenty of sample and should eliminate any "click".
But then again, I am talking out of my arse.
Tim Smith
I'm going to patent thought. I have yet to see any prior art.
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Well , but what about interpolation ?
How can i implement it ?
And how can i eliminate "clicks" ?
regards
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A click is the sudden change in value for the signal. For example, going from 0 to 65535 for a 16 bit signal.
A linear interpolation example would be:
Last sample for signal a = 20.
First sample for signal b = 220.
To interpolate between the two samples using 4 new samples, you would insert the new samples between the two waves.
60,100,140,180
Tim Smith
I'm going to patent thought. I have yet to see any prior art.
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How can I get the IP address of a url? I been using gethostbyaddress but it keeps returning WS_NODATA (even on cp, msdn.microsoft.com ...)
BTW (m_locSite=GetLocationURL()):
if (m_locSite.Find("file://",0)==-1)<br />
{<br />
m_locSite=m_locSite.Mid(0,m_locSite.Find("/",8));<br />
if (m_locSite.Find("://",0)==-1) m_locSite="http://"+m_locSite;<br />
<br />
WSADATA wsa;<br />
WSAStartup( 0x0101, &wsa );<br />
unsigned long addr = inet_addr(ConvertCStringToChar(m_locSite));<br />
<br />
if (addr == INADDR_NONE)<br />
{<br />
<br />
HOSTENT * lpHostEnt = gethostbyname(ConvertCStringToChar(m_locSite));<br />
CString tmpEr;<br />
tmpEr.Format("%d",WSAGetLastError());<br />
MessageBox(m_locSite+" | "+tmpEr);<br />
<br />
if (lpHostEnt)MessageBox(inet_ntoa( *(LPIN_ADDR)*(lpHostEnt->h_addr_list) ));<br />
<br />
<br />
}<br />
WSACleanup();<br />
}
-Steven
CP Addict
By reading this message you are held fully responsible for any of the mispelln's or grammer, issues, found on, codeproject.com.
For those who were wondering, actual (Linux) Penguins were harmed in creating this message.
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Rather than adding the http:// if not present, I believe you should strip it off if it is, and content after any subsequent slash (including the slash should be stripped. For example, given a url http://www.codeproject.com/script, the actual host name is www.codeproject.com.
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THANKS ALOT!!!!
It was really bugging me.
-Steven
By reading this message you are held fully responsible for any of the mispelln's or grammer, issues, found on, codeproject.com.
For those who were wondering, actual (Linux) Penguins were harmed in creating this message.
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THANKS ALOT!!!!
It was really bugging me.
-Steven
CP Addict
By reading this message you are held fully responsible for any of the mispelln's or grammer, issues, found on, codeproject.com.
For those who were wondering, actual (Linux) Penguins were harmed in creating this message.
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..Do you know what function retrieves all the text of a MS Word document via automation in VC++? Thanks in advance for saving me an hour and half of searching on MSDN!
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There's a Delphi sample in SoftMosis Delphi/MSWord Automation FAQ[^]. It's done via the IDataObject interface.
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
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How can i get an image (for example 100x100) under curent position of mouse pointer ?
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Is it possible to set tab stops with a list view control in report mode as can be done with a list box, akin to LBS_USETABSTOPS?
If the answer to the above is no, let me explain what I'm trying to accomplish and I would welcome suggestions as to what would be a better approach. The application I'm working on has a live display of commands, events, and data packets to and from a hardware device. It can also write a log file with that information. The user needs to be able to open that log file and view it in a variation on the live log window. The log file can grow to be arbitrarily large. The log file is parsed once to determine a "packet" count and line count, and then a virtual list control is created (LVS_OWNERDATA). The log file is subsequently re-parsed on demand to cache a range of packets around the current view position. The user can enable and disable details display on all packets. Without details, the list would lend itself well to columns, but with details display, it wouldn't, since the details need to be formatted as:
1/1/03 9:39:59.321____usb_____Command___Reset
____Data = [03 0C 00]
1/1/03 9:39:59.321____usb_____Event______Command Complete
____Data = [0E 04]: 01 03 0C 00
____Num_HCI_Command_Packets = 0x01
____Command_Opcode = 0xC03 ("Reset")
____Status = 0x00 ("Success")
____^______________^_______^_________^
The packet header lines need to be column-aligned, but the details, when shown, run across column boundaries. Therefore, I need the list control to have a single column, but use tab stops to align the fields at the positions indicated with carets.
So...should I switch to a list box with owner draw style to avoid bringing all of the packets into memory instead? Ideally, I'd like to stick with a list view control and somehow get it to respect tabs instead of just showing a
box character.
Thanks in advance,
Brian
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Thanks, but I'm trying to avoid a fully customized control. I can do what I need to if I switch to list box instead of list view and take advantage of the owner draw property to manage which packets are cached in memory and when to fetch them from disk. I'd like to stick with the list view though so I don't have to reinvent the wheel in terms of the having to render everything. I'd prefer to let the system-provided controls just do their job. Unfortunately, if the list view really doesn't support tabs (a huge oversight on microsoft's part IMHO) I'll have no choice. Still hoping someone knows how to get the list view control to respect tabs...
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Well, no. The list view control supports columns. The list control supports tabs. That's about the size of it.
You *can* use custom draw and the header control to implement columns on a list control, or custom draw and a bit of creativity to implement tabs on a list view control.
I'd put the choice at this: if you need columns, and you don't need variable-height rows, go with the list control. If you need variable-height rows, you'll need either a completely custom control or a customized list control.
---
Shog9
The siren sings a lonely song - of all the wants and hungers
The lust of love a brute desire - the ledge of life goes under
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I don't even need the columns per se. I need a column effect to lend readability to the packet display without details. But I need to cross multiple columns for the detail lines. That would suggest that the list box control with LBS_USETABSTOPS is the way to go. Problem is there could potentially be way too much content. I wanted to take advantage of the explicitly intended virtual property of the list view control and the ease-of-use of the API to add an icon to the heading lines (better visual cues for each packet to further enhance readability). But if it ties my hands in terms of the columns and won't do tabs (I was intending to use the list view control with a single column and tabs to provide alignment) then I may be out of luck and have to go with an owner-draw list box. I didn't want to have to go that far in the interest of time. If I could forget the icons and go with a list box instead of list view control, I still need the "virtual" property. Looking at the documentation, it sounds like I need the LBS_OWNERDRAWFIXED property. Unless it's there under layers of documentation silt, I don't see anything about being able to leave off the LBS_HASSTRINGS property, but also not use the LBS_OWNERDRAWFIXED property, let the list box take care of the rendering and I provide the strings on demand by a callback as with a virtual list view control. Is that possible? The documentation would suggest not: "By default, all list boxes except owner-drawn list boxes have this style. You can create an owner-drawn list box either with or without this style."
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