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<p>[QUOTE="mrbrklyn, post: 468096, member: 4381"]Date: Thu, 27 Nov 2008 16:41:33 -0800</p><p>From: "Jung, William" <aopiyy001@yahoo.com></p><p>Lines: 54</p><p>Message-ID: <rhfui49l1cclmp98vel3tvo5ukgaj4slhe@4ax.com></p><p>NNTP-Posting-Date: Fri, 28 Nov 2008 00:41:37 +0000 (UTC)</p><p>NNTP-Posting-Host: o9Ot+8D9ayi1c7HQkwFT2w.user.aioe.org</p><p>Newsgroups: comp.lang.c++</p><p>Organization: Aioe.org NNTP Server</p><p>Path: reader1.panix.com!panix!news.linkpendium.com!news.linkpendium.com!news.k-dsl.de!aioe.org!not-for-mail</p><p>References: <mdpsi4hrjndomshrqb5a5jisdd7b023ctt@4ax.com> <d2e36a40-2769-473b-ab92-3679e2c8e985@v42g2000yqv.googlegroups.com> <ag1ti4hamasa1312tns2visvi7ac4ormld@4ax.com> <12230115-4dfd-4346-9dd4-c6236df7abde@20g2000yqt.googlegroups.com> <c8f1e19e-5820-44a1-82e4-30605061a4f8@o2g2000yqd.googlegroups.com> <k95ti4p81vp67kured1mcru1qg5ind3969@4ax.com> <ggm635$7fp$1@newsreader2.netcologne.de></p><p>Subject: Re: passing this object</p><p>X-Complaints-To: <a href="mailto:abuse@aioe.org">abuse@aioe.org</a></p><p>X-Newsreader: Forte Agent 4.1/32.1088</p><p>X-Notice: Filtered by postfilter v. 0.7.5</p><p>Xref: panix comp.lang.c++:1028006</p><p>MIME-Version: 1.0</p><p>Content-Type: text/plain; charset=us-ascii</p><p>Content-Transfer-Encoding: 7bit</p><p><br /></p><p>On Thu, 27 Nov 2008 14:07:33 +0100, "Thomas J. Gritzan"</p><p><phygon_antispam@gmx.de> wrote:</p><p><br /></p><p>>Jung, William write:</p><p>>> On Thu, 27 Nov 2008 04:29:30 -0800 (PST), maverik</p><p>>> <maverik.mail@gmail.com> wrote:</p><p>>> </p><p>>>> On Nov 27, 3:17?pm, maverik <maverik.m...@gmail.com> wrote:</p><p>>>>> On Nov 27, 2:35?pm, "Jung, William" <aopiyy...@yahoo.com> wrote:</p><p>>>>></p><p>>>>>> the whole error log is like this:<a href="http://www.oniva.com/upload/1356/log.txt" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.oniva.com/upload/1356/log.txt" rel="nofollow">http://www.oniva.com/upload/1356/log.txt</a></p><p>>>>> 1>d:\snd\remote\remotedemo\app\virtualawear\sock.h(31) : error C2061:</p><p>>>>> syntax error : identifier 'CVirtualScreen'</p><p>>>>></p><p>>>>> CVirtualScreen is unknown identifier in sock.h. From where sock.h</p><p>>>>> should know what the hell is CVirtualScreen?</p><p>>>> Ok. If you included "Sock.h" into the "VirtualScreen.h", you can't</p><p>>>> include</p><p>>>> "VirtualScreen.h" into "Sock.h" because of circular dependence.</p><p>>>></p><p>>>> So you can try to write something like:</p><p>>>></p><p>>>> extern class VirtualScreen;</p><p>>>></p><p>>>> in Sock.h.</p><p>>> </p><p>>> Thanks so much your help.</p><p>>> </p><p>>> OK, the errors goes away if I use forward class declaration or extern.</p><p>>> </p><p>>> but when I added the line (sock.cpp)</p><p>>> Vscreen->PushMessage(std::string((const</p><p>>> char*)m_bReceiveBuffer + j)); </p><p>>> </p><p>>> where Vscreen is like this</p><p>>> CVirtualScreen *Vscreen; (sock.h)</p><p>></p><p>>You can't call member function on classes that are only forward</p><p>>declared. Once you call member functions or create objects of a class,</p><p>>you need the full declarationn of the class.</p><p>></p><p>>So make sure that you include the header for CVirtualScreen in sock.cpp.</p><p>>Also, don't forget to use "include guards" in your headers.</p><p><br /></p><p>What is "include guards" in my headers? any example?</p><p><br /></p><p>></p><p>>There are some issues in the FAQ about that point:</p><p>><a href="http://www.parashift.com/c++-faq-lite/misc-technical-issues.html#faq-39.11" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.parashift.com/c++-faq-lite/misc-technical-issues.html#faq-39.11" rel="nofollow">http://www.parashift.com/c++-faq-lite/misc-technical-issues.html#faq-39.11</a></p><p>>and the two following.</p><p>></p><p>>Also, please post the error message you get. You can copy&paste it</p><p>>directly from the output window. Most people won't click on wild links</p><p>>in postings.[/QUOTE]</p><p><br /></p>
[QUOTE="mrbrklyn, post: 468096, member: 4381"]Date: Thu, 27 Nov 2008 16:41:33 -0800 From: "Jung, William" <aopiyy001@yahoo.com> Lines: 54 Message-ID: <rhfui49l1cclmp98vel3tvo5ukgaj4slhe@4ax.com> NNTP-Posting-Date: Fri, 28 Nov 2008 00:41:37 +0000 (UTC) NNTP-Posting-Host: o9Ot+8D9ayi1c7HQkwFT2w.user.aioe.org Newsgroups: comp.lang.c++ Organization: Aioe.org NNTP Server Path: reader1.panix.com!panix!news.linkpendium.com!news.linkpendium.com!news.k-dsl.de!aioe.org!not-for-mail References: <mdpsi4hrjndomshrqb5a5jisdd7b023ctt@4ax.com> <d2e36a40-2769-473b-ab92-3679e2c8e985@v42g2000yqv.googlegroups.com> <ag1ti4hamasa1312tns2visvi7ac4ormld@4ax.com> <12230115-4dfd-4346-9dd4-c6236df7abde@20g2000yqt.googlegroups.com> <c8f1e19e-5820-44a1-82e4-30605061a4f8@o2g2000yqd.googlegroups.com> <k95ti4p81vp67kured1mcru1qg5ind3969@4ax.com> <ggm635$7fp$1@newsreader2.netcologne.de> Subject: Re: passing this object X-Complaints-To: [email]abuse@aioe.org[/email] X-Newsreader: Forte Agent 4.1/32.1088 X-Notice: Filtered by postfilter v. 0.7.5 Xref: panix comp.lang.c++:1028006 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit On Thu, 27 Nov 2008 14:07:33 +0100, "Thomas J. Gritzan" <phygon_antispam@gmx.de> wrote: >Jung, William write: >> On Thu, 27 Nov 2008 04:29:30 -0800 (PST), maverik >> <maverik.mail@gmail.com> wrote: >> >>> On Nov 27, 3:17?pm, maverik <maverik.m...@gmail.com> wrote: >>>> On Nov 27, 2:35?pm, "Jung, William" <aopiyy...@yahoo.com> wrote: >>>> >>>>> the whole error log is like this:[url]http://www.oniva.com/upload/1356/log.txt[/url] >>>> 1>d:\snd\remote\remotedemo\app\virtualawear\sock.h(31) : error C2061: >>>> syntax error : identifier 'CVirtualScreen' >>>> >>>> CVirtualScreen is unknown identifier in sock.h. From where sock.h >>>> should know what the hell is CVirtualScreen? >>> Ok. If you included "Sock.h" into the "VirtualScreen.h", you can't >>> include >>> "VirtualScreen.h" into "Sock.h" because of circular dependence. >>> >>> So you can try to write something like: >>> >>> extern class VirtualScreen; >>> >>> in Sock.h. >> >> Thanks so much your help. >> >> OK, the errors goes away if I use forward class declaration or extern. >> >> but when I added the line (sock.cpp) >> Vscreen->PushMessage(std::string((const >> char*)m_bReceiveBuffer + j)); >> >> where Vscreen is like this >> CVirtualScreen *Vscreen; (sock.h) > >You can't call member function on classes that are only forward >declared. Once you call member functions or create objects of a class, >you need the full declarationn of the class. > >So make sure that you include the header for CVirtualScreen in sock.cpp. >Also, don't forget to use "include guards" in your headers. What is "include guards" in my headers? any example? > >There are some issues in the FAQ about that point: >[url]http://www.parashift.com/c++-faq-lite/misc-technical-issues.html#faq-39.11[/url] >and the two following. > >Also, please post the error message you get. You can copy&paste it >directly from the output window. Most people won't click on wild links >in postings.[/QUOTE]
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