Dotted lines ?! - C / C++ / MFC Discussion Boards

Joel Holdsworth4-Jun-02 11:29

4-Jun-02 11:29

http://www.codeproject.com/atl/rbdeskband.asp
This article is a wazard for creating deskbands.

http://www.codeproject.com/tools/codeprojectsearchbar.asp
The codeproject IE bar is a nice example of how it all works.

I don't know about how XML will work into that, but this is what CP has to offer!

With time we live, with money we spend!
Joel Holdsworth

loading dll's

4-Jun-02 10:21

Hi I'm new to c++ and need a little help loading dll's at run-time. I found a bit of code on msdn, edited it and crossed my fingers but it didn't work Cry | :((

. Can anyone see why?

-------------------------------------------------
int CMainFrame::LoadPlugins()
{

typedef UINT (CALLBACK* LPFNDLLFUNC)();

HINSTANCE hDLL[5]; // Handle to DLL
LPFNDLLFUNC lpfnDllFunc[5]; // Function pointer
UINT uReturnVal = 0;

CString PluginName[5] = {"plugin1.dll", "plugin2.dll"};

for (int i = 0; i != 5; ++i)
{
// Use Plugin name to load plugin
hDLL[i] = LoadLibrary("Plugins\\" + PluginName[i]);
if ((hDLL[i]) != NULL)
{
AfxMessageBox("Loaded Plugin : " + PluginName[i]);
lpfnDllFunc[i] = (LPFNDLLFUNC)GetProcAddress(hDLL[i], "Load");

if (!lpfnDllFunc[i])
{
// handle the error
AfxFreeLibrary(hDLL[i]);
AfxMessageBox("Couldn't Execute Plugin : " + PluginName[i] + ". No such function.");
}
else
{
// call the function
uReturnVal = lpfnDllFunc[i]();
AfxMessageBox("Function Called");
}
}
else
{
if (PluginName[i] != "")
AfxMessageBox("Couldn't Load Plugin : " + PluginName[i]);
}
}
//if a return value was set at least 1 plugin loaded
if (uReturnVal)
return 1;

}
-------------------------------------------------

It will load the dll but not execute the function.

Any help would be appreciated

Thanks

Re: loading dll's

Mike Nordell5-Jun-02 0:53

Mike Nordell

5-Jun-02 0:53

Anonymous wrote:
lpfnDllFunc[i]();

How about (*lpfnDllFunc[i])();

Re: loading dll's

5-Jun-02 3:42

Thanks for the reply, i think the problem might be in the dll, i'm not sure i'm exporting the function correctly.

The line: lpfnDllFunc[i] = (LPFNDLLFUNC)GetProcAddress((hDLL[i]), "Load");

returns NULL, does this mean it cant find the function?

I'm using the folowing code to export it

------------------------------------------

__declspec( dllexport ) int CPluginApp::Load()
{
AFX_MANAGE_STATE(AfxGetStaticModuleState());
AfxMessageBox("Inside DLL");
return 1;
}

------------------------------------------

Thanks again for the help, as i said i'm a newbe and i've taken on a rather large project for my first proper C++ app, got quite a complex UI sorted but this DLL stuff is giving me a headache.

Do you know of any system DLL's that export functions i might try and access to see if the code in my exe works? (at least then i could concentrate on exporting from the DLL correctly)

Re: loading dll's

Mike Nordell5-Jun-02 4:03

Mike Nordell

5-Jun-02 4:03

Anonymous wrote:
The line: lpfnDllFunc[i] = (LPFNDLLFUNC)GetProcAddress((hDLL[i]), "Load");

returns NULL, does this mean it cant find the function?

When something is so clearly documented and you display you haven't even bothered to look it up in the documentation before wasting our time and bandwidth, do you really expect to get any more answers?

Re: loading dll's

5-Jun-02 4:37

I have looked it up in the documentation, that's how i've got this far, i'm attempting to teach myself c++ and occasionally run into problems, there's no need to be such an arse about it. If you don't want to help dont reply.

Re: loading dll's

Mike Nordell5-Jun-02 6:19

Mike Nordell

5-Jun-02 6:19

I wasn't being an arse just for the sake of it, it was to make you realize that to deserve help you should at least have exhausted your own sources of information before asking for help. Since knowing about pointers, and especially NULL pointers, is among the most basic aspects of this language I (apprently falsely) assumed you knew it.

May I suggest (and this is not trying to be a prick, this is the helpful me that is writing) that you have a look around the 'net? Googling for e.g. "beginners c++" can probably turn up quite a lot.

Reading comp.lang.c++.moderated, even the archives at http://groups.google.com, can probably turn up a lot of information.

I don't know what edition of MSVC you are using, but there are loads of samples in e.g. the SDK folder. MSDN also have many samples.

Dotted lines ?!

4-Jun-02 9:25

Hello,
I need paint dotted line using Win32API with GDI. I'm trying to draw focusRect, but with exact color, not inverting the background like DrawFocuRect does.
If I use pen style PS_DOT the pen is not exactly dotted - there are small lines.
I need one pixel colored and one transparent.
Have you any idea how to draw it?

I've looked at DrawFocusRect code and it calls undocumented PolyPatBlt Confused | :confused:

Ondra

Re: Dotted lines ?!

Bruno Podetti4-Jun-02 10:46

Bruno Podetti

4-Jun-02 10:46

Did you try to use an userpen? This is a way how to make a doted line too. Smile | :)

LOGBRUSH LogBrush;
LogBrush.lbColor = RGB(255,0,0);
LogBrush.lbStyle = BS_SOLID;
DWORD Spaces[] = {1,1};
CPen MyPen2(PS_USERSTYLE|PS_ENDCAP_FLAT|PS_GEOMETRIC,0,&LogBrush,2,Spaces);

Non-MFC Equivalent to CFileFind?

Dan Watt4-Jun-02 8:58

Dan Watt

4-Jun-02 8:58

I need the functionality of CFileFind for a project, but I can't be dependent on MFC for this project. Is there an API equivalent, or better a portable library for doing this? I know Boost has a class dir_it that will do it, but it looks like its still in beta.

Re: Non-MFC Equivalent to CFileFind?

Shog⁹4-Jun-02 8:57

Shog⁹

4-Jun-02 8:57

CFileFind is based on a Win32 API. To do it w/out MFC, use something like this:

WIN32_FIND_DATA FindFileData; 
HANDLE hFind = FindFirstFile(strCurrentPath + m_szREPORT_FILTER, &FindFileData);
if (hFind != INVALID_HANDLE_VALUE) 
{
   do
   {
      // do stuff with FindFileData.cFileName
   } while ( FindNextFile( hFind, &FindFileData) );
   FindClose(hFind);  
}

--------

Life is fraught with opportunities to keep your mouth shut.

--Shog⁹ --

Re: Non-MFC Equivalent to CFileFind?

Ravi Bhavnani5-Jun-02 6:17

Ravi Bhavnani

5-Jun-02 6:17

You could also use _findfirst(), _findnext() and _findclose().

/ravi

"There is always one more bug..."
http://www.ravib.com
ravib@ravib.com

Re: Non-MFC Equivalent to CFileFind?

Michael Haephrati6-Jan-15 10:15

Michael Haephrati

6-Jan-15 10:15

CFileFind is supported by ATL so a pure Win32 API project should support CFileFind.

- Michael Haephrati מיכאל האפרתי

STL question

4-Jun-02 8:39

Is there an equivalent of CString FormatMessage for STL strings and wstrings?

thanks

Re: STL question

C^hris L^osinger4-Jun-02 8:52

C^hris L^osinger

4-Jun-02 8:52

nope.

-c

Cheap oil. It's worth it!

ISEffects - effects for images

Re: STL question

Alexandru Savescu4-Jun-02 12:03

Alexandru Savescu

4-Jun-02 12:03

None that I am aware of. However you can use sprintf.

Best regards,
Alexandru Savescu

4-Jun-02 6:55

I am trying to create a fstream member function. However, no luck !
I am using VC bw..
this is what I have

yyyy.h

#include <fstream>

class x
{
public:

protected:
ofstream of;

};

that's all.... and I get the following error:

error C2872: 'ofstream' : ambiguous symbol

However, when I move the same declaration to the cpp file, everything works?

So, how do I go about creating a member variable for a file pointer?

thanks

Re: <fstream>

Rama Krishna Vavilala4-Jun-02 7:14

Rama Krishna Vavilala

4-Jun-02 7:14

A note about your post :-

<fstream> would not work on the subject line. As it is HTML.

The answer

Include only the file fstream. Do not include "fstream.h" if you are doing that. Then you need to prefix

#include <fstream>

class x
{
public:

protected:
std::ofstream of;
};

Prefix with std.

Re: <fstream>

Rage4-Jun-02 7:11

Rage

4-Jun-02 7:11

Hem Rama, how did you manage to read the post ???

~RaGE();

Re: <fstream>

Rama Krishna Vavilala4-Jun-02 7:24

Rama Krishna Vavilala

4-Jun-02 7:24

1. View->Source
2. Find Reply URL
3. Type the reply URL on the address bar

Smile | :)

Re: <fstream>

Matt Newman4-Jun-02 7:49

Matt Newman

4-Jun-02 7:49

I give you points for enginuity Smile | :)

Matt Newman / Windows XP Activist Suspicious | :suss:

-Sonork ID: 100.11179

Could you Would you with a goat? - Dr Suess

Re: <fstream>

dazinith4-Jun-02 7:38

dazinith

4-Jun-02 7:38

click on the title of the article and hit tab Smile | :)

the real question is why we would go through such work to read a post Smile | :)

-dz

Re: <fstream>

Rama Krishna Vavilala4-Jun-02 7:49

Rama Krishna Vavilala

4-Jun-02 7:49

dazinith wrote:
click on the title of the article and hit tab

That's far more simpler.

dazinith wrote:
the real question is why we would go through such work to read a post

The guy did not do it purposefully. It's a mistake which happens everynow and then

Re: <fstream>

Matt Newman4-Jun-02 7:58

Matt Newman

4-Jun-02 7:58

Rama Krishna wrote:
The guy did not do it purposefully. It's a mistake which happens everynow and then

If he is annonymous because he is new, he probably did not realize the situation with HTML.

- Suspicious | :suss:

Matt Newman / Windows XP Activist Suspicious | :suss:

-Sonork ID: 100.11179

Could you Would you with a goat? - Dr Suess

DAO and Visual Studio .NET

4-Jun-02 7:01

I can't build the DAOSDK\SAMPLES\addrbook with VC++ 7.0 . I have got this error message.

c:\inetsrv\scripts\Addrbook.dll : fatal error LNK1120: 1 unresolved externals
"public: class ATL::CStringT<char,class strtraitmfc<char,class="" atl::chtraitscrt<char=""> > > __thiscall CdbLastOLEError::GetDescription(void)"

Thanks

Feri

Feri

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