C / C++ / MFC Discussion Boards

Matt Newman5-Jan-03 11:42

5-Jan-03 11:42

I am trying to convert a CString to char so I can run it through inet_addr I think I have done this before but cannot remember how. Thanks if anyone can help.

- Suspicious | :suss:

Matt Newman / Windows XP Activist Suspicious | :suss:

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Re: Stuck: CString to char

Matt Gullett5-Jan-03 12:10

Matt Gullett

5-Jan-03 12:10

Matt Newman wrote:
convert a CString to char

I think you actually want a const char*. Anyway, you should be able to just pass the CString object right in because it has a default LPCTSTR operator.

Re: Stuck: CString to char

Matt Newman5-Jan-03 12:37

Matt Newman

5-Jan-03 12:37

Matt Gullett wrote:
I think you actually want a const char*.

I double checked and that is the one I want. However when I try to compile

CString strDest = _T("192.168.0.6");
...
dwForwardDest = inet_addr(strDest);

I get this compile error:

error C2664: 'inet_addr' : cannot convert parameter 1 from 'CString' to 'const char *'
       No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called

Matt Newman / Windows XP Activist Suspicious | :suss:

Re: Stuck: CString to char

carrie5-Jan-03 12:44

carrie

5-Jan-03 12:44

CString strDest = _T("192.168.0.6");
char buff[512];
_tcscopy(buff,strDest);
dwForwardDest = inet_addr(buff);

Thats what I'd do, and I've used it on a couple of oldie winsock programs so it seems to work for me.

Re: Stuck: CString to char

Matt Newman5-Jan-03 14:09

Matt Newman

5-Jan-03 14:09

I tried this but I got an error

error C2664: 'wcscpy' : cannot convert parameter 1 from 'char [512]' to 'wchar_t *'
        Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast

Matt Newman / Windows XP Activist Suspicious | :suss:

Re: Stuck: CString to char

Matt Gullett5-Jan-03 12:45

Matt Gullett

5-Jan-03 12:45

Is this a UNICODE build? Are you building under VC7?

I am not 100% sure, but on VC7 you may need to do (LPCTSTR)strSomeString to get what you want.

If this is a UNICODE build, you will need to convert the contents of the CString from UNICODE WCHAR to char. Take a look at the wctomb function.

Re: Stuck: CString to char

Matt Newman5-Jan-03 14:12

Matt Newman

5-Jan-03 14:12

I forgot about the UNICODE troubles Frown | :(

but the (LPCTSTR) trick doesn't seem to work for this one.

- Suspicious | :suss:

Matt Newman / Windows XP Activist Suspicious | :suss:

Re: Stuck: CString to char

RobJones5-Jan-03 12:50

RobJones

5-Jan-03 12:50

I am able to use a standard CString, strange that its giving you an error.. Maybe try

dwForwardDest = inet_addr(LPCTSTR("192.168.0.6"));

Re: Stuck: CString to char

Matt Newman5-Jan-03 14:16

Matt Newman

5-Jan-03 14:16

It is giving me errors because I am converting a MBCS console application to a UNICODE MFC appplication so the UNICODE/MBCS types are conflicting etc Frown | :(

Matt Newman / Windows XP Activist Suspicious | :suss:

Re: Stuck: CString to char

Michael Dunn5-Jan-03 15:42

Michael Dunn

5-Jan-03 15:42

Matt Newman wrote:
cannot convert parameter 1 from 'CString' to 'const char *'

That tells me you're doing a Unicode build. CString has an LPCTSTR converter, which is a Unicode string in Unicode builds. Since you need a single-byte string, you'll need to convert it. The quickest way is an ATL conversion macro.

#include <atlconv.h>

{
USES_CONVERSION;
CString strDest = _T("192.168.0.6");
...
dwForwardDest = inet_addr( T2CA((LPCTSTR)strDest) );
}

--Mike--
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Re: Stuck: CString to char

Matt Gullett5-Jan-03 16:53

Matt Gullett

5-Jan-03 16:53

Michael Dunn wrote:
T2CA

DOH! I with I knew about this several months ago. I know how to do it manually, but this is much, much easier.

Re: Stuck: CString to char

Matt Newman6-Jan-03 12:13

Matt Newman

6-Jan-03 12:13

I tell you all higher education does is makes you for get the UNICODE/MBCS conversion macros Smile | :)

Thanks for the help!

- Suspicious | :suss:

Matt Newman / Windows XP Activist Suspicious | :suss:

Re: Stuck: CString to char

nobitaplus2-Nov-09 13:49

nobitaplus

2-Nov-09 13:49

thanks a lot ! Smile | :)

Use Resource to Load and Show images

HellShrimp4free5-Jan-03 10:38

HellShrimp4free

5-Jan-03 10:38

hi is there any simple way to load images such as BMP or Gif or any other formats from Resources and NOT FROM THE FILE using GDI+ . Roll eyes | :rolleyes:

for example i include a bitmap in Resource .how can i Load it in my project that project.EXE don't need that picture file anymore.

regards

Re: Use Resource to Load and Show images

Michael Dunn5-Jan-03 10:49

Michael Dunn

5-Jan-03 10:49

Bitmap::FromResource()

--Mike--
When 900 years old you reach, look as good you will not. Hmm.
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Re: Use Resource to Load and Show images

HellShrimp4free5-Jan-03 11:24

HellShrimp4free

5-Jan-03 11:24

i use this code line but it's not work . what is wrong with me?

<br />
Graphics graphics(dc.m_hDC);<br />
			<br />
graphics.DrawImage(Bitmap::FromResource(AfxGetInstanceHandle(), L"IDB_BITMAP1"),0,0,400,400);

Re: Use Resource to Load and Show images

Michael Dunn5-Jan-03 11:39

Michael Dunn

5-Jan-03 11:39

Use passing the string "IDB_BITMAP1" instead of the numeric value of IDB_BITMAP1.

Bitmap::FromResource ( AfxGetInstanceHandle(), MAKEINTRESOURCE(IDB_BITMAP1) )

--Mike--
When 900 years old you reach, look as good you will not. Hmm.
1ClickPicGrabber - Grab & organize pictures from your favorite web pages, with 1 click!
My really out-of-date homepage
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Re: Use Resource to Load and Show images

HellShrimp4free5-Jan-03 11:59

HellShrimp4free

5-Jan-03 11:59

i did my best but this error occures again :
cannot convert parameter 2 from LPSTR to Const WCHAR * Cry | :((

how can i fix this

Re: Use Resource to Load and Show images

PJ Arends5-Jan-03 15:29

PJ Arends

5-Jan-03 15:29

Your problem has to do with the fact that GDI+ uses all wide character strings (UNICODE) so you have to convert all strings passed to GDI+ functions to wide characters.

#include <afxpriv.h>

...

USES_CONVERSION;
Bitmap::FromResource ( AfxGetResourceHandle (), T2W ( MAKEINTRESOURCE (IDB_BITMAP1) ) );

CPUA 0x5041

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Re: Use Resource to Load and Show images

Michael Dunn5-Jan-03 15:55

Michael Dunn

5-Jan-03 15:55

Actually, that's not correct in this case. MAKEINTRESOURCE just expands to a cast, it doesn't create an actual string. So that code will probably crash or give incorrect results when something that isn't a string is passed to T2W.

--Mike--
When 900 years old you reach, look as good you will not. Hmm.
1ClickPicGrabber - Grab & organize pictures from your favorite web pages, with 1 click!
My really out-of-date homepage
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Re: Use Resource to Load and Show images

Michael Dunn5-Jan-03 15:52

Michael Dunn

5-Jan-03 15:52

Bitmap::FromResource ( AfxGetInstanceHandle(), (LPCWSTR) MAKEINTRESOURCE(IDB_BITMAP1) )

The cast to (LPCWSTR) is the correct way in this case due to the way the APIs handle resource IDs. All resource ID parameters are strings, usually LPCTSTR, because a resource ID can be either a real string or a number. When you pass a numeric ID, you use the MAKEINTRESOURCE macro to convert it to a string - the macro just expands into a cast to LPCTSTR.
The problem with GDI+ is that its functions take LPCWSTR parameters. Since I assume you're doing an ANSI build, MAKEINTRESOURCE casts to LPCSTR, not LPCWSTR. Since you are passing a number, not a real string, you need to cast to LPCWSTR to satify the compiler. The API will know what to do with the value.

[edit]
Actually, never mind all that (but it's still good to know the technicalities of resource IDs Wink | ;)

). Use the MAKEINTRESOURCEW() macro which always casts to LPCWSTR.
[/edit]

--Mike--
When 900 years old you reach, look as good you will not. Hmm.
1ClickPicGrabber - Grab & organize pictures from your favorite web pages, with 1 click!
My really out-of-date homepage
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Re: Use Resource to Load and Show images

HellShrimp4free5-Jan-03 19:02

HellShrimp4free

5-Jan-03 19:02

thats Workkkkkk i can't believe itttttt
Thanksss A LOOOTTTTT Rose | [Rose]

Looking for a Text-to-Speech program with VC++ API

kyoko5-Jan-03 7:21

kyoko

5-Jan-03 7:21

Hi,
I am developing a program that needs to read a text file to the user. Could anybody tell me where I can find such a open source program or API? Thanks

Re: Looking for a Text-to-Speech program with VC++ API

(Steven Hicks)ⁿ⁺¹5-Jan-03 7:36

(Steven Hicks)ⁿ⁺¹

5-Jan-03 7:36

Use the Speech SDK.
A tutorial on it can be found at:
http://www.ltpb.8m.com/tutorial/Listall.html[^] (i forgot the direct url, but this is the list)

-Steven
CP.Lounge.Addicts+="Steven";

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For those who were wondering, actual (Linux) Penguins were harmed in creating this message.

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DLL linke error and name mangling

nay5-Jan-03 6:59

nay

5-Jan-03 6:59

I'm having trouble linking to a DLL that I've made. I have a project that uses multiple DLLs that we've created in house. Everything uses this one DLL that's has the most commonly used classes. Amazingly enough it's called common.dll. Anyway I'm having trouble linking to it in one of the other dlls. The signature that it gives in the error is ?StartServiceA@CTcpClient@@UAEHXZ. BUT the signature in the mapfile of common.dll and according to dependency walker is ?StartService@CTcpClient@@UAEHXZ. Common.dll as well as the CTcpClient class inside of it is used in many other things. They all link fine. One other note of interest. This linking error only happens when CTcpClient is created dynamically. If I create it using CTcpClient newClient(blah,blah,blah) all works. Thanks for the help.

Here's the full linking error.

Linking...
Creating library ..\..\..\lib/NetTraffic.lib and object ..\..\..\lib/NetTraffic.exp
ClientInterface.obj : error LNK2001: unresolved external symbol "public: virtual int __thiscall CTcpClient::StartServiceA(void)" (?StartServiceA@CTcpClient@@UAEHXZ)
..\..\..\lib/NetTraffic.dll : fatal error LNK1120: 1 unresolved externals

nay

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