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Hello all
i have developed (VC7) a Cstatic derived CUlrLink class to enable url clicking and browsing in my about dialog boxes.
It basically uses a custom cursor (IDC_HAND) created inside the 'res' subfolder.
As i'd like to reuse this stuff in all my projects, I've tried something like:
main projects folder
\--> reuse_code\urllink.cpp, urllink.h,
\--> reuse_code\res\hand cursor
\--> newapplication
in this folder i was planning to use an #include "..\common\urllink.h"
but i need also the cursor hand to be included, so i have at least to copy it inside the local 'res' folder, and i have noticed have also to manually change the local resource.h file...
Futher problems when i try to create a reusable 'about dialog box' including an usual couple url link + a mailto link. Fo esample I have to examine the Resources ids etc.
In VC6 i remember there was a 'components gallery', i had only to select a 'component' and it was included , say, with the right references inside a new project.
Summarizing, how do you reuse your code in a situation close to the above?
As pointed out, i don't get troubles with classes not using some resources (just including the .h files and adding the .h/.cpp files seems enough)
thanks in advance
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Jan Van Der Mix wrote:
In VC6 i remember there was a 'components gallery', i had only to select a 'component' and it was included , say, with the right references inside a new project.
Yes, this still exists, and it's for COM components. You can create dialog templates in code, the info is in MSDN. To be honest, I'd think a cursor would be a small enough graphic that you could store it as byte data in your code easy enough also.
Christian
No offense, but I don't really want to encourage the creation of another VB developer. - Larry Antram 22 Oct 2002
Hey, at least Logo had, at it's inception, a mechanical turtle. VB has always lacked even that... - Shog9 04-09-2002
During last 10 years, with invention of VB and similar programming environments, every ill-educated moron became able to develop software. - Alex E. - 12-Sept-2002
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Jan Van Der Mix wrote:
In VC6 i remember there was a 'components gallery', i had only to select a 'component' and it was included , say, with the right references inside a new project.
Toolbox window, right-click, Customize...
Back to real work : D-19.
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NTDLL! 77f7f570()
NTDLL! 77f8ec53()
GDIPLUS! 70d282c7()
GDIPLUS! 70d2829c()
GDIPLUS! 70d04d90()
GDIPLUS! 70d33b92()
GDIPLUS! 70d31034()
Gdiplus::GraphicsPath::Outline(const Gdiplus::Matrix * 0x00000000, float 0.250000) line 747 + 19 bytes
Anyone know why I get a User Breakpoint? Should I be worried? The breakpoint still happens in release mode via the debugger, but when running the app outside of vc, nothing complains...
Thanks,
swine
Check out Aephid Photokeeper, the powerful digital
photo album solution at www.aephid.com.
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Looks to me like you're passing in a null pointer to GraphicsPath::Outline.
Christian
No offense, but I don't really want to encourage the creation of another VB developer. - Larry Antram 22 Oct 2002
Hey, at least Logo had, at it's inception, a mechanical turtle. VB has always lacked even that... - Shog9 04-09-2002
During last 10 years, with invention of VB and similar programming environments, every ill-educated moron became able to develop software. - Alex E. - 12-Sept-2002
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Cmon, i thought you were the gdiplus guru! 
GraphicsPath::Outline(matrix, flatness)
The Outline method transforms and flattens this path, and then converts this path's data points so that they represent only the outline of the path.
Status Outline(
const Matrix* matrix,
REAL flatness
);
Parameters
matrix
[in] Optional. Pointer to a Matrix object that specifies the transformation. If this parameter is NULL, no transformation is applied. The default value is NULL.
flatness
[in] Optional. Real number that specifies the maximum error between the path and its flattened approximation. Reducing the flatness increases the number of line segments in the approximation. The default value is FlatnessDefault, which is a constant defined in Gdiplusenums.h.
Check out Aephid Photokeeper, the powerful digital
photo album solution at www.aephid.com.
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Swinefeaster wrote:
Cmon, i thought you were the gdiplus guru!
Who has been telling lies about me ?
Seriously, I do no graphics work at all anymore, I could probably (re)learn quite a bit by reading my old articles.
Christian
No offense, but I don't really want to encourage the creation of another VB developer. - Larry Antram 22 Oct 2002
Hey, at least Logo had, at it's inception, a mechanical turtle. VB has always lacked even that... - Shog9 04-09-2002
During last 10 years, with invention of VB and similar programming environments, every ill-educated moron became able to develop software. - Alex E. - 12-Sept-2002
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that's too bad --- graphix is where the action is!
did you run into any funny stuff in gdi plus? i've ran into a few weird things (had to even write a wrapper around GraphicsPath for some of them). but did you ever run into any user breakpoints like this?
cheers,
swine
Check out Aephid Photokeeper, the powerful digital
photo album solution at www.aephid.com.
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Swinefeaster wrote:
that's too bad --- graphix is where the action is!
It's fun, but it's not really where the money is. I'm glad to have learned it, but also glad to have moved on.
Swinefeaster wrote:
but did you ever run into any user breakpoints like this?
Nope, not that I can recall.
Christian
No offense, but I don't really want to encourage the creation of another VB developer. - Larry Antram 22 Oct 2002
Hey, at least Logo had, at it's inception, a mechanical turtle. VB has always lacked even that... - Shog9 04-09-2002
During last 10 years, with invention of VB and similar programming environments, every ill-educated moron became able to develop software. - Alex E. - 12-Sept-2002
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Hello, I'm sure that my problem must be easy to solve:
When I resize a property sheet and it's tab control I must know how many rows of tabs will the tab control occupy, in order to resize it properly.
Anybody knows how to do it?
NOTE:
When I resize the tab control it's shown in an ugly way, but when I change of tab it gets redrawn and it looks like the problem gets solved...
thank you in advance.
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I wanted to parse URLs out of HTML page (for building web spider) and stucked over possible variations of URL. Whatever rule i try to apply to searching function there is allways at least one exception where it fails; does someone knows for any way to handle it all or maybe some library that has that implemented (not mozila source, please )?
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Use the WinInet InternetCrackUrl function.
When I am king, you will be first against the wall.
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I dont want to "crack" url to its components (server/dir/file), but i want to get all urls that are stored inside single html file. If it would be only HTML 1.0+ everything would go well, but there is allso javascript, etc.
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hey there all, i'm having trouble getting a toolbar to be streched across the whole width it can and having it dockable, i can get it to strech when i turn docking off, any ideas?
thanks for any help.
luke
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I want to create a program that log all printing done in a specific network printer. Do I need to play with EnumJobs and GetJob? Or do I need to hook to API/DLL? How?
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I am reading up on some COM sample.. I have problem understanding the way they do casting:
//
STDMETHODIMP CUserInfo::QueryInterface(REFIID iid, LPVOID *ppv)
{
*ppv = NULL;
if (IID_IUnknown == iid)
*ppv = (LPVOID)(IUnknown *)this;
else if (IID_IUserInfo == iid)
*ppv = (LPVOID)(IUserInfo *)this;
else
return E_NOINTERFACE; //Interface not supported
//Perform reference count through the returned interface
((IUnknown *)*ppv)->AddRef();
return NOERROR;
}//QueryInterface
QUESTION: Casting. I can understand:
long nLong;
double nDouble;
nLong = 10;
nDouble = (double) nLong;
But I have no idea what's the different between:
*ppv = (LPVOID)(IUnknown *)this;
*ppv = (LPVOID)(IUserInfo *)this;
*ppv = this;
*ppv = (LPVOID)this;
Thanks!
norm
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A coclass that implements IUnknown and IUserInfo has two different vtables, one for each interface. Thus (IUknown*) this is a different address from (IUserInfo*) this.
The cast to LPVOID is unnecessary, as the language allows implicit conversion of any pointer type to void*.
--Mike--
"alyson hannigan is so cute it's crazy" -- Googlism
Just released - 1ClickPicGrabber - Grab & organize pictures from your favorite web pages, with 1 click!
My really out-of-date homepage
Sonork-100.19012 Acid_Helm
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Given that they are casting to a LPVOID by default, the middle steps seem pointless. I try to use smart pointers instead of this sort of ugliness, or C++ casts at least.
Christian
No offense, but I don't really want to encourage the creation of another VB developer. - Larry Antram 22 Oct 2002
Hey, at least Logo had, at it's inception, a mechanical turtle. VB has always lacked even that... - Shog9 04-09-2002
During last 10 years, with invention of VB and similar programming environments, every ill-educated moron became able to develop software. - Alex E. - 12-Sept-2002
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All that's going on here is the code is returning the proper interface requested through the QueryInterface call. What may be confusing you is the double cast, e.g., first a cast to an IUnknown*, then to LPVOID.
They're first casting to the proper interface (the one that was requested), then "stuffing" the ppv return variable with that interface. They have to cast to LPVOID because that's the variable type, even though its unecessary since casting to void* is native.
"Casting" is just making one thing appear to be another and is used quite often in C / C++ programming, though it may be "unsafe" because you could lose things in the translation.
In C++, some programmers consider it better to explicitly state that you are casting, such as using reinterpret_cast. That way the intent is clear:
IUserInfo* pUI = reinterpret_cast<IUserInfo*>(this);
*ppv = reinterpret_cast<LPVOID>(pUI);
Either way is acceptable. I try not to cast as much as possible, but if I do, tend to use the latter unless I'm feeling carpal tunnel from all the extra typing /:]
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it seems that casting has no effect except that it changes the option available thru "Intellisense" and the method that the object can invoke thru the pointers...
but there must be a reason why they cast the pointers...
here's some simple code i used to test this out:
// TryCasting.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include "stdio.h"
#include "iostream.h"
class C
{
public:
DisplayC() { cout << "C" << endl; }
};
class B : public C
{
public:
DisplayB() { cout << "B" << endl; }
};
class A : public B
{
public:
DisplayA() { cout << "A" << endl; }
};
//So:
//(1) A is B (since A inherits from B)
//(2) A is C
int main(int argc, char* argv[])
{
A * pA = new A;
cout << "pA = " << pA << endl;
cout << "(B*) pA = " << (B*) pA << endl;
cout << "(C*) pA = " << pA << endl;
cout << "(void*) pA = " << (void*) pA << endl;
B * pB = pA;
C * pC = pA;
//check and see the options registered with Intellisense:
pA->DisplayA(); //thru pA, all three methods DisplayA/B/C are available
pB->DisplayB(); //thru pB, only DisplayB/C are available
pC->DisplayC(); //thru pC, only DisplayC is available.
return 0;
}
anyway, this confirm "your" perspective. but there must be a reason.... otherwise:
if (IID_IUnknown == iid)
*ppv = (LPVOID)(IUnknown *)this;
else if (IID_IUserInfo == iid)
*ppv = (LPVOID)(IUserInfo *)this;
else
QueryInterface will always return "this"!! why the if-else statement in the first place?
norm
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Technically, you do not have to do the casting of this to (eventually, however convoluted) void**. However, the if block is to see what interface a caller is requesting. In COM, you can "aggregate" or "contain" another object (and your class itself may be similarly "aggregated" or "contained",) and make it part of your object, thus sometimes a caller will request something that's not in your class signature, and you'd use that pointer instead of this. So your safest bet is to do at least the interface cast.
Also, it's important to AddRef() on the correct interface in COM. It seems from the example, their class is simply derived from IUnknown, so they use the base IUnknown::AddRef(). Other COM objects may use different referencing depending on the interface, e.g., if they're "containing" or "aggregating" another object whose lifetime may not be the same as the parent object, and so the last call to IUnknown::AddRef is the safest bet for all interfaces that your object may return.
Perhaps that's whats confusing is that COM object lifetime isn't necessarily the same per interface that is exposed by an object, and the first cast to a specific interface is safe, in order to get it to the increment the correct AddRef on the correct object.
Besides that, yes, the autocompletion of code is nifty. COM isn't the clearest thing with casting, and that's due to the nature of the COM standard.
Example: Your class contains a custom data object, that doesn't necessarily have to be around as long as your parent object, but you wish to expose it's interface. You have a pointer to the object m_pMyContained:
STDMETHODIMP CMyCOMObject::QueryInterface(REFIID iid, LPVOID* ppv)
{
*ppv = NULL;
if (IID_IUnknown == iid)
*ppv = (IUnknown*)this;
elseif (IID_IMyObject == iid)
*ppv = (IMyObject*)this;
elseif (IID_IMyContained)
*ppv = (IMyContained*)m_pMyContained;
else return E_NOINTERFACE;
((IUnknown*)*ppv)->AddRef();
return S_OK;
}
<div style="width: 360px; background-color: rgba(208, 208, 240, 1); margin: 4px; padding: 4px; font-family: monotype bold; font-size: 7pt; font-variant: ; font-weight: ; font-style: ; line-height:">"The greatest danger to humanity is humanity without an open mind."<br> - Ian Mariano - <a href="http://www.ian-space.com" target="_blank">http:
</div>
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okay, your example makes sense:
*ppv = NULL;
if (IID_IUnknown == iid)
*ppv = (IUnknown*)this; // redundant since it's this, but safe because we may be contained ourselves
elseif (IID_IMyObject == iid)
*ppv = (IMyObject*)this; // redundant since it's this, but safe because we may be contained ourselves
elseif (IID_IMyContained)
*ppv = (IMyContained*)m_pMyContained; //different object, different "lifecycle"
else
return E_NOINTERFACE; // AddRef() correct IUnknowninterface // Note IMyContained's IUnknown is DIFFERENT from this' // so we use whatever object's IUnknown to do the AddRef
((IUnknown*)*ppv)->AddRef();
return S_OK;
Just want to reconfirm that my understanding is indeed correct...
STDMETHODIMP CUserInfo::QueryInterface(REFIID iid, LPVOID *ppv)
{
*ppv = NULL;
if (IID_IUnknown == iid)
*ppv = (LPVOID)(IUnknown *)this; //THE CAST HERE, ...
else if (IID_IUserInfo == iid)
*ppv = (LPVOID)(IUserInfo *)this; //AND HERE ARE POINTLESS/IRRELEVANT. Am I correct?
else
return E_NOINTERFACE; //Interface not supported
//Perform reference count through the returned interface
((IUnknown *)*ppv)->AddRef();
return NOERROR;
}//QueryInterface
Thanks for your feedback!
norm
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Hi!
Thanks for your advice. But all I want to solve is just and MFC custom control not COM:
CEdit
A
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CParsedEdit
A
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CParsedEditExport
Using this pattern, everything went well.
Now I use pure abstract class as interfaces. As Stroustrup says "What is important is interfaces." So I change the design pattern threoretically:
CEdit IEdit(abstract)
A A
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CParsedEdit
A
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CParsedEditExport
But this time the problem exist: Please see my code in the my original message.
Thanks,
Sovann.
Why waste time learning while ignorence is instantaneous ? [Hobbes]
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Hi, everyone!
I want to know whether I can download MSDN iso file
from somewhere? Where to download?
I often buy MSDN iso cdroms (3 CDs per month) from local
vendor. And I think it is not efficient and somewhat waste
money. Is MSDN free to download?
Cheers,
George
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MSDN comes out every three months.
Given that Microsoft *sell* it on CD, if you can't find it at www.microsoft.com, downloading from anywhere else would be stealing. AFAIK they only offer it online. You can go to msdn.microsoft.com, and I doubt you'll use up 2 gig a quarter browsing it, so it's bound to be cheaper, too.
Christian
No offense, but I don't really want to encourage the creation of another VB developer. - Larry Antram 22 Oct 2002
Hey, at least Logo had, at it's inception, a mechanical turtle. VB has always lacked even that... - Shog9 04-09-2002
During last 10 years, with invention of VB and similar programming environments, every ill-educated moron became able to develop software. - Alex E. - 12-Sept-2002
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