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I think there is no difference regarding the final executable, but I think putting of #pragma comment(lib,"XXXXXX.lib") in your files at least requires less configuration work when you re-use your code in other applications. You will not need to remember each time which external libraries must be used.
For instance, this practice can be seen in the header files supplied with MFC.
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Hi:
Does anybody know about this problem?
I have been developing this application for several weeks now. I've created all sorts of dialog boxes and used Class Wizard to create a CDialog based class for each one.
Since late last week, Class Wizard has simply stopped working. I create a dialog resource, double click it to invoke Class Wizard, the window pops up, I fill it out and press "Finish". Nothing happens. It does NOT generate the class files. No error is reported, it just doesn't do anything.
I am at a dead stop here. Is anyone familiar with this problem? Somebody suggested last week that I delete the NCB file. This is Visual Studio 2003. I do not see an NCB file in my project directory. I have tried deleting the ASP file but this has had no effect.
Thanks in advance,
Mark
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I don't see a CLW file either. Perhaps that is the problem...
Mark
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there is no .clw in VC++ 2003
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I want to convert a string to LPWSTR to be used in RegOpenKeyEx.
i had been able to do it to the string directly i.e. L"xxx"
but unable to do it using string variable.
how can i do that please help.
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If performance is not important, I think the easier alternative way is using of _bstr_t type. You can assign and you can get strings of both types:
_bstr_t s;
s = "abc";
s = L"abc";
char * a = s;
wchar_t * w = s;
So just try ::RegOpenKeyEx(..., _bstr_t(my_non_unicode_string), ...).
Note that you can explicitly stipulate the version of RegOpenKeyEx function when your strings do not correspond to the project configuration settings. Just use RegOpenKeyExA or RegOpenKeyExW according to your needs.
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So just try ::RegOpenKeyEx(..., _bstr_t(my_non_unicode_string), ...).
this does not work.. gives error at _bstr_t
please help
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The _bstr_t type is defined in comutil.h, so you have to add:
#include <comutil.h>
If this is not enough and you get linker errors, probably you will have to add comsuppw.lib library to project settings (Linker --> Input --> Additional Dependencies).
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i tried that and now it is giving me error: unable to convert from standard string to _bstr_t.
LONG retcode = RegOpenKeyEx(HKEY_CLASSES_ROOT,_bstr_t(ext.toStdString()), 0, KEY_ENUMERATE_SUB_KEYS, ®key);
tell me wat should I do. I am working on QT development env.(based on C++)
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I suppose ext.toStdString() returns a std::string. In this case, you should try ext.toStdString().c_str(). Otherwise investigate which kind of value returns toStdString().
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Hi,
I am having a problem with the collection class CStringList
In the part below, coded in vc++6, when the program is executen and StrList.AddTail(pStr[i]) is reached, the error 'this program has performed an illigal operation..." comes.
Although while compiling, no error is shown.
Please can you tell me what is going wrong?
<br />
void Cop1::OnAdd() <br />
{<br />
int iCount = 0;<br />
int i;<br />
POSITION p;<br />
<br />
iCount = m_payeeList.GetSelCount();<br />
<br />
if (iCount <= 0) return ;<br />
<br />
int* pItems = new int [iCount];<br />
m_payeeList.GetSelItems(iCount, pItems);<br />
<br />
CStringList StrList;<br />
<br />
char *pStr[10];<br />
<br />
for (i=0;i<iCount; i++)<br />
{<br />
<br />
m_payeeList.GetText(pItems[i], pStr[i]);<br />
StrList.AddTail(pStr[i]);<br />
<br />
}<br />
}<br />
Thanks.
Tara
Fortitudine Vinsinues!
-- modified at 10:20 Tuesday 13th June, 2006
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I think instead of
m_payeeList.GetText(pItems[i], pStr[i]);
StrList.AddTail(pStr[i]);
you should try
CString text;
m_payeeList.GetText(pItems[i], text);
StrList.AddTail(text);
Now you do not need pStr, which actually was not initialized.
Hope it helps.
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Ah! That works. But I did initialised pStr:
char *pStr[10];
How do I get the string back form the StringList?
The code below is giving error. Is it correct?
POSITION p;<br />
CString s;<br />
s.Format("%s",StrList.GetNext(p)); <br />
AfxMessageBox(s,MB_OK);
Tara
Fortitudine Vinsinues!
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I think you missed to initialize p. The following should work:
POSITION p = StrList.GetHeadPosition();
CString s = StrList.GetNext(p);
AfxMessageBox(s,MB_OK);
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Yes! It works! Thanks a billion!
Tara
Fortitudine Vinsinues!
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Can I not pass the String list, StrList to a function?
It is not working when I am passing it like usual function.
I get the error 'FillReportList' : cannot convert parameter 1 from 'class CStringList' to 'class CStringList'
FillReportList(StrList);<br />
<br />
FillReportList(CStringList list)<br />
{<br />
}<br />
Fortitudine Vinsinues!
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If you need to read some values from the list, try this:
FillReportList(const CStringList <big>&</big> list)
{
}If you need to modify the list, try this:
FillReportList(CStringList <big>&</big> list)
{
}
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Thanks. Please can you explain the consept to me? Why is it that when we use a CString object we don't put & while for CStringList we do? Is it because it is a list?
Fortitudine Vinsinues!
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When you make a function like FillReportList(CStringList list) or FillReportList(int x), the system actually tries to make a copy of passed values (on the "stack"). Within the function, you work with the copy.
Copying is possible for int and other types, but is not possible for CStringList. This is because CStringList is a class which does not have a "copy constructor".
Disabling of copy operation for CStringList was decided by the authors, since frequently CStringList can have big size, and therefore multiple copying can be problematic in your application from the memory usage viewpoint.
Therefore we cannot pass a CStringList object by making a copy. In this case, we should pass a reference to the object, using "&" in argument declaration. Now the system does not make a copy of your list, but simply passes a small reference (an address, a pointer).
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Thanks a lot for explaining the concept so nicely. Now I understand why we pass some object this way. Earlier, I used to do tria-and-error to see what works!!
Tara
Fortitudine Vinsinues!
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TheinstruTara wrote: But I did initialised pStr:
char *pStr[10];
Only if you had done something like:
for (i = 0; i < iCount; i++)
{
pStr[i] = new char[100];
m_payeeList.GetText(pItems[i], pStr[i]);
}
"The largest fire starts but with the smallest spark." - David Crow
"Judge not by the eye but by the heart." - Native American Proverb
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int iCount = 0;
int i;
iCount = m_payeelist.GetSelCount();
if (iCount <= 0) return ;
int* pItems = new int [iCount];
m_payeelist.GetSelItems(iCount, pItems);
CStringList StrList;
for (i=0;i<m_payeelist.GetSelCount();i++)
{
char *pStr=new char[10];
m_payeelist.GetText (pItems[i],pStr);
StrList.AddTail(pStr);
delete pStr;
}
See if this helps
Somethings seem HARD to do, until we know how to do them.
_AnShUmAn_
-- modified at 10:38 Tuesday 13th June, 2006
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