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I'm trying to design some generic callbacks, which works well enough (using similar techniques to Andrescu's ScopeGuards[^]), except for the return value of the callback function.
for void, it#s simple:
struct CCallback { virtual void Call() = 0; }
template <class T>
struct CCallbackFunc_0 : public CCallback
{
T func;
CCallbackFunc_0(T func_) : func(func_) {}
void Call() { func(); }
};
template <class T>
CCallback * CreateCallback(T func_)
{
return new CCallbackFunc_0<T>(func_);
}
Now I figure I could have two separate branches, one templatized over the return type, but this makes a lot of code, and breaks the nice syntax for using CreateCallback.
Any ideas? Suggestions? Other approaches?
Flirt harder, I'm a coder.
mlog || Agile Programming | doxygen
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Have you tried using a template, specifying void as the return type? The compiler will spit out a warning (not an error) if a void function returns a value, which you can safely ignore.
Ryan "Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"
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I'd like to be able to receive the return value when I do the "Call" through the base class (hence the idea of templating the base class over return type)
Flirt harder, I'm a coder.
mlog || Agile Programming | doxygen
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i would like to build an application to communicate with the Proxy. hw to do it
Thank You
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I cant give you direct solution, but can give you pointers.
you need to know which proxy you are targeting,
HTTP 1/1 proxy, or sock, etc
mostly it is HTTP 1/1 proxy, so if you could refer the RFC for HTTP you will know how to do it.
regards,
Prakash.
Toughest Steel Comes From Hottest Furnance
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Hi !
I'd like to try to write a very simple RSS reader, but...well, I have no idea where to start.
I've seen that I would need to read an XML file at a specific internet address and parse this XML file, but I'm wondering how other readers work : do I have to poll every x minutes the RSS feed and check for new informations or is there a way to get informed when new info is available ?
Thanks for your help !
Jerome
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Jerome Conus wrote:
do I have to poll every x minutes the RSS feed and check for new informations or is there a way to get informed when new info is available
He he. Welcome to the wonderful world of RSS. You've just found one of the many cans of worms that litter this particular landscape. RSS 2.0 has a way of notifying clients when things have changed but nobody bothers with it.
RSS Bandit[^] is open source so that should get you started.
Awasu is, of course, way cooler but I'm not giving away any source 
Lets be honest, isn't it amazing how many truly stupid people you meet during the course of the day. Carry around a pad and pencil, you'll have twenty or thirty names by the end of the day - George Carlin
Awasu 1.2 [^]: A free RSS reader with support for Code Project.
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I am trying to interface my C code converted from Matlab with OpenCV.
I tried to get OpenCV to display the image I got from the Matlab
converted C code, but I got a BLACK IMAGE.
- FG is of mxArray * type.
- Using mxGetPr(FG) is supposed to return me the pointer to first
element of FG.
- Then I tried to capture the data in FG in char_ptr.
- And pass in the data in char_ptr into oImage->imageData.
- But all I get is a black image.
- Below is my program:
Can anyone please tell me what is wrong? 
/*assigning the ouput from Matlab converted code to FG*/
mlfAssign(&FG, mlfIndexRef(mclVv(class0, "class"), ".FG"));
int m = mxGetM( FG );
int n = mxGetN( FG );
double * double_ptr = 0;
char char_ptr[240][320];
int i, j, count = 0;
double_ptr = mxGetPr( FG );
for(j=0;j<n;j++){
for(i=0;i<m;i++){
char_ptr[i][j]=(char)(*(double_ptr+count));
}
count++;
}
oimage =="" cvcreateimage(="" cvsize(n,="" m="" ),="" ipl_depth_8u,="" 1="" );
oimage-="">imageData = *char_ptr;
cvSaveImage("outputFG.jpg", oImage);
Please help...
pistachio
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HI,
i m begginer.
I want to get the handle of a Dialog , that i created after cliking on a button . (for both .. Modless and model)
plz tell me.
thanx
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Hello,
The handle is a member of the CDialog object - m_hWnd.
I think this will be NULL until you have called the Create function on a modeless window.
Regards,
Simon
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Use GetParent() from the button.
John
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I want to use Icon overlay for my files.
What i ve to do with the folowing method of IShellIconOverlayIdentifier
Methods are
GetOverlayInfo
GetPriority
IsMemberOf
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Hi all,
I want to create a web browser plugin.But i don't know from where to starts.
 .
Any help to start will be a great
Thanks in advance
AL
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Which web broser are you talking about,
if IE there are samples in CodeProject,
if Netscape visit www.fundocode.com
Toughest Steel Comes From Hottest Furnance
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Hi Prakash,
I want to write IE Browser Plugins.I need something like Adobe Reader.Also I would like to difference between Browser Helper Object and Plugin.
Again,thanks in advance.
AL
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Sorry i dont have much info about that, but there are ie plugin samples using wtl here on cp.
Toughest Steel Comes From Hottest Furnance
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hello firends,
how can i convert text into image programmitically.
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Draw the text into a device context using TextOut or DrawText, then get the bitmap from the device context.
onwards and upwards...
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I want to fill a chosen color from the color palette in a static control at runtime.How can i do it?
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Create a custom derived class of any control and handle the WM_ERASEBACKGROUND in that class.create a solid brush of required color and paint the background(Note do it after calling base classes OnEraseBachGrnd).
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hi there
1.How to disable Shift key?
2.How to change Shift key function to let it become as same as Ctrl key?
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You can use GetKeyState() in you WM_KEYDOWN processing to check the state of the shift key; or you can simply process the WM_KEYDOWN message and check the wParam parameter for VK_SHIFT and then use SendMessage() to post a new message with VK_CONTROL.
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To make the control of IDC_RADIO1 to be enabled state,I tried SendDlgItemMessage and EnableWindow respectively.The result is the statement "EnableWindow(GetDlgItem(hDlg,IDC_RADIO1),TRUE);" succeeds, but the "
SendDlgItemMessage( hDlg, IDC_RADIO1, WM_ENABLE, (WPARAM)0L, (LPARAM)0L );" is failing! Why???
The following is my codes:
LRESULT CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)<br />
{<br />
switch (message)<br />
{<br />
case WM_INITDIALOG:<br />
return TRUE;<br />
case WM_COMMAND:<br />
switch(LOWORD(wParam))<br />
{ <br />
case IDOK:<br />
case IDCANCEL:<br />
EndDialog(hDlg, LOWORD(wParam));<br />
return TRUE;<br />
case IDC_BUTTON1:<br />
EnableWindow(GetDlgItem(hDlg,IDC_RADIO1),TRUE);
break;<br />
}<br />
break;<br />
}<br />
return FALSE;<br />
}
Rap off for you,for me,for our human.
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From msdn:
The WM_ENABLE message is sent when an application changes the enabled state of a window. It is sent to the window whose enabled state is changing. This message is sent before the EnableWindow function returns, but after the enabled state (WS_DISABLED style bit) of the window has changed.
So i think WM_ENABLE is like a notification message and its handler isn't really responsible for changing the state of the control.
<font=arial>Weiye Chen
When pursuing your dreams, don't forget to enjoy your life...
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Hello!
I need a cool Button (with MouseOver, MouseLeave and all other cool stuff), but I don't wann use any MFC Class. I need a pure SDK Cool Button.
Some ideas?
Thanxs.
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