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I have a listctrl for logging. Logging can be activated or deactivated. When logging is deactivated, I want to make the text and background grayer grayer. I know how to use CustomDraw, but how do you make colors grayer? Anyone got a clue?
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Gray is an equal combination of red, green and blue color values.
Jason Henderson
"You must be the change you wish to see in the world." - Gandhi
articles profile
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Ok, but that doe not make me a lot wiser. How do I actualy translate color values to gray values or to their darker equvalents?
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Most GDI functions take a COLORREF which defines the color you want the GDI object to be. A COLORREF is made up of red, green and blue components and you can use the RGB(r,g,b) macro to get a COLORREF.
So basically, to make the color darker, you could decrease the red, green, and blue values by the same percentage. To make it grayer, you could extract the red, green and blue values from the original color then equalize each value toward a set value of gray, say RGB(192,192,192). Here's an example of making orange grayer:
Original Orange:
Red = 236
Green = 122
Blue = 0
Gray value:
R = 192
G = 192
B = 192
if (original value > gray value)
new value = original value - (original value - gray value)/2
else
new value = original value + (gray value - original value)/2
New values:
R = 214
G = 157
B = 96
ORIGINAL COLOR
NEW COLOR
Darken example using original orange and a percantage value of 50%:
New values:
R = 118
G = 61
B = 0
DARKENED COLOR
Jason Henderson
"You must be the change you wish to see in the world." - Gandhi
articles profile
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Thanx!! This is exactly what I was looking for. 
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What do you mean greyer ? Make them darker ? lighter ?
You can convert the RGB values to HSV and modify the V value to make the color darker or lighter.
Max.
Maximilien Lincourt
For success one must aquire one's self
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#define NEXT_INDEX ????<br />
<br />
void something()<br />
{<br />
int A0 = NEXT_INDEX;
int A1 = NEXT_INDEX;
int A2 = NEXT_INDEX;
...<br />
...<br />
}
Hi, how can I define NEXT_INDEX macro so that it increments by one, each time the compiler parses it?
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You can use a static variable that you increment with the macro. Something that looks like:
<br />
static int StaticIndex = 0;<br />
#define NEXT_INDEX StaticIndex++;<br />
This should work!
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This would increment the index at runtime. What I need is the pre-processor to increment the index as it compiles so that the indices are found at compile time and fixed at runtime.
Something like this (which will not compile..)
#define AAA 0<br />
<br />
#define NEXT_INDEX<br />
{<br />
AAA
#define AAA (AAA+1) //next time it is incremented by one<br />
}
First time using NEXT_INDEX it compiles to AAA (which is 0 at first), next time I want it to compile to 1. This setup imo makes sence, but not to the compiler..
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IMHO, there is no way of storing information at compile time. So, there is no way of storing a numbeer, incrementing and using it at compile time.
It's not the fall that kills you: it's the sudden stop - Down by Law, Jim Jamursch (1986)
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I'm pretty sure there's a clever template solution to this problem, but from looking at your example, I'm thinking it doesn't need to be too complicated.
Going on the assumption that your variable will be named with the same value as it holds (such that VARn = n), then you can create a simple macro that defines it, like this:
#define DEFINE_INDEX_VAR(prefix, number) const int prefix##number = number
void something()
{
DEFINE_INDEX_VAR(A, 0);
DEFINE_INDEX_VAR(A, 1);
...
DEFINE_INDEX_VAR(Z, 1000);
}
Regards,
Alvaro
When birds fly in the right formation, they need only exert half the effort. Even in nature, teamwork results in collective laziness. -- despair.com
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Hi !!
This is a little stupid question but I don't know how to make it 
I derived a class from the CStatic class and I draw the control myself in the Paint() function. But know I want it to have the "normal" grey color (the color of a standard push button for exaple) in the background. Does anybody know the RGB color code of it ?
Thanks
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RGB(192, 192, 192)
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Thanks but it's not the same gray 
So, it's quite ugly because I use this control on a form so the colors are not exactly the same
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uhh, bad idea - the color depends on your os settings.
use ::GetSysColor(COLOR_BTNFACE)
that should do it.
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Thanks a lot!!
I was exactly searching for something like that
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I have two files:
a.txt:
20020102,23.0
20020103,23.0
.............
20021220,23.5
b.txt:
20010101,22
20010102,25
...........
20010301,35
Now I want to append the latest datas of the file "a.txt" to the file "b.txt". How could I do ! Please tell me the easy way to do it!
The focus is: I want appending the "latest" datas of a.txt to the file bb.txt
The latest datas in the file a.txt are the datas that are not included in the file b.txt.
Note: i only want to append the datas that the b.txt is not included.
Thanks a lot!
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Hi,
1. Is it possible to remove the right scrollbar of a WebBrowser control ?
2. In my control I load a page that open a new window with ad every 2 minutes, so i wrote this code to prevent this :
void CBrowserDlg::NewWindow2Explorer(LPDISPATCH* ppDisp, BOOL* Cancel)
{
*Cancel = TRUE;
}
The problem is that if I click on a link, and that link try to open a new window, it will be blocked, so is it possible to intercept the URL of the page that is going to be opened ?
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tinkywinky wrote:
1. Is it possible to remove the right scrollbar of a WebBrowser control ?
I am doubtful that removing the WS_VSCROLL style would do much (especially since, from what I remember, several windows are embedded, not only one). After all, scrollbars are dynamically set and are part of the web browser.
tinkywinky wrote:
2. In my control I load a page that open a new window with ad every 2 minutes, so i wrote this code to prevent this :
Implement the BeforeNavigate2 event handler.
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What is the easiest way of getting a file from the http protocol, of course without the prompt asking the user for confiramtion??
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see the functions
InternetOpen
InternetOpenUrl
InternetReadFile
InternetCloseHandle
..in this order .. and you should easily be able to download a file via http!
greetings
markus
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Hi all,
I'm trying to find out how I can 'get into' the ras dial process before a connection is established. Basically, I need to be able to measure the time it takes to carry out the various stages of dialling a connection - whether or not it's my app which instigates the dial.
Currently, I measure the dialling stages (dial, connect, auth, projection, etc) if I dial myself (using a RasDialFun and RasDial). I can measure the timings for the later stages of a dial (everything from Auth onwards) by using RasConnectionNotification to indicate a new connection being made, and then by polling with RasGetConnectStatus to see the later connection stages change. However, I have no way of detecting a new dial occurrence before the physical link is established.
Ideally, I'd like to be able to detect the dialling as soon as it occurred, and monitor the time it takes for the call to be answered (including failures, such as line engaged, etc) for *any* connection, instigated by any app (or even the user dialling via DUN). Is this possible?
Thanks
Mark
________________________
http://www.webreaper.net
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I assume you are using the callback in RasDial e.g. RasDialFunc(UINT unMsg, RASCONNSTATE rasconnstate, DWORD dwError) and checking rasconnstate for all states such as RASCS_OpenPort
If not I can post the states I check.
I never managed to check for a line engaged, what happens is when a line is enaged you get a timeout notification, I would like to teminate the call on an engaed tone, so if you find out how I would be very interested to find out how you did it!
If I have seen further it is by standing on the shoulders of Giants. - Isaac Newton 1676
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That's exactly what I'm doing, and it works perfectly - as long as I perform the dial myself.
However, I also want to monitor the dialling even if it's performed by another app, or by the user manually starting a connection via dial-up networking. In the latter case, whilst I can get an HRASCONN handle by enumerating RAS connections, it only 'appears' after the RASC_Auth status occurs - meaning I can't time the actually dialling part of the connection unless I initiate it.
Regarding the engaged error issue, I'm not sure - but it's something I have to handle/detect, so if I find a solution I'll post it back in this thread. 
________________________
http://www.webreaper.net
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I have one code downloaded from
http://safariexamples.informit.com/0130869856/Samples/Chapt_04/DDISpy/
It is DDI functions spy.
When I start compiling the code. I get the error
"Cannot open include file: 'ntddk.h': No such file or directory"
I included the inc(include) and libfre\i386(library) in the project through the Tools->Options->Directories... but Still no effect...
what I need to do 
VIkramS
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