C / C++ / MFC

David Crow12-May-03 4:38

12-May-03 4:38

Use CButton::Create().

JensB12-May-03 4:43

JensB

12-May-03 4:43

Hi David

Ok but the ID given to that CButton needs to be changing, i would make it something like
IDC_BUTTONREMOVENR1
IDC_BUTTONREMOVENR2
...

How can i now use the same code for IDC_BUTTONREMOVENR1 & the others?
Let's assume i have written the correct code for the 1st button on click. But can i use that code now for the other buttons too and how so?

Greetings
Jens

David Crow12-May-03 5:06

12-May-03 5:06

I don't know what your design is, but I would think an acceptable solution would be to put the employees in a list control with checkboxes in the first "column." Then you would only require one Remove button. Does that make sense?

If that violates your design, you can use something like:

BEGIN_MESSAGE_MAP(CMyDlg, CDialog)
//{{AFX_MSG_MAP(CMyDlg)
//}}AFX_MSG_MAP
ON_COMMAND_RANGE(IDC_BUTTONBASE, IDC_BUTTONBASE + 4, OnRemove)
END_MESSAGE_MAP()

CButton *pRemoveButtons[5];
for (int x = 0; x < 5; x++)
{
pRemoveButtons[x] = new CButton;
pRemoveButtons[x]->Create(..., IDC_BUTTONBASE + x);
}

void CMyDlg::OnRemove(UINT nID)
{
TRACE("You clicked on Remove button #%d\n", nID - IDC_BUTTONBASE);
}

basementman12-May-03 5:23

basementman

12-May-03 5:23

I think that ON_CONTROL_RANGE would probably be a little simpler to use here, rather than ON_COMMAND_RANGE.

David Crow12-May-03 5:56

12-May-03 5:56

Whether you provide the BN_CLICKED notification code in the macro or the handler function, I don't see that one is any easier to use than the other.

CPropertySheet

RalfPeter12-May-03 4:23

RalfPeter

12-May-03 4:23

Does any one know how to access the help button on a property sheet? I'm trying to use the resource editor, but all it lets me access are the individual pages. Thanks,
Ralf.

ralf.riedel@usm.edu

Re: CPropertySheet

JensB12-May-03 4:30

JensB

12-May-03 4:30

hi RalfPeter

You can't access the help button on the property sheet because you can't see the form, and that's pretty ennoying.

Doesn't it work when you add 'OnHelp' (message map) @ header file propsheet?

afx_msg void OnHelp();

void CMyPropSheet::OnHelp()
{
AfxMessageBox("onhelp");
}

Hope this works.

Just Modified
I fixed the problem by not using the standard help button but i created the button myself.

OnInitDialog:
CRect rect, tabrect;

//Get button sizes and positions
GetDlgItem(IDOK)->GetWindowRect(rect);
GetTabControl()->GetWindowRect(tabrect);
ScreenToClient(rect);ScreenToClient(tabrect);

int iWidth = rect.Width();
rect.left = tabrect.left;
rect.right = tabrect.left + iWidth;

m_ButtonHelp.Create("&Help",BS_PUSHBUTTON|WS_CHILD|WS_VISIBLE|WS_TABSTOP, rect, this, IDC_BUTTON_HELP);
//add IDC_BUTTON_HELP in RESOURCE.H yourself!!
m_ButtonHelp.SetFont(GetFont());

This creates the button + positions it correctly.
Then work with the previous code to catch the onclick.

Greetings
Jens

Re: CPropertySheet

David Crow12-May-03 4:36

simple virtual method design q.

12-May-03 4:36

Exactly what do you mean by "access the help button?" Are you wanting to respond to the clicking of the Help button? As the property sheet is not based on a dialog template (like the property pages are), you obviously won't be able to alter it via the resource editor. The OK, Cancel, Apply and Help buttons are created dynamically.

See if the MSDN article Q132715 is of any help.

Maximilien12-May-03 4:06

Maximilien

12-May-03 4:06

In my base class I have this (the base class is pure-virtual)

class CBase
{
protected:
  bool m_bEnable;

public:
  bool EnableMe( bool bEnable ) = 0;
}

and in each derived class, I have

bool DerivedClass::EnableMe( bool bEnable )
{
 m_bEnable = bEnable;
// do something..
}

would it be better to have :

class CBase
{
protected:
  bool m_bEnable;

public:
  bool EnableMe( bool bEnable ) { bEnable = bEnable;};
}

bool DerivedClass::EnableMe( bool bEnable )
{
  CBase::EnableMe(bEnable);
// do something..
}

Thanks,

Max.

Maximilien Lincourt
For success one must aquire one's self

Re: simple virtual method design q.

G. Steudtel12-May-03 4:42

G. Steudtel

12-May-03 4:42

Hi,
it depends on the use of the class.
If you want to impement a interface class, then the pure virtual class should be used.
Keep in mind, that you cannot create instances (aka variables) of this class. Those classes can only be accessed by pointers.
You may write a function body for a pure virtual function, which may be called by any derived class. Resulting in a combination of your to proposals.

G. Steudtel

Compile error c2664

Claude Gagnon12-May-03 3:56

Claude Gagnon

12-May-03 3:56

Hi,

I have a project that compile with the c2664 error.

error C2664: 'test' : cannot convert parameter 4 from 'void (int,float [],float [])' to 'void (__cdecl *)(int,float [],float [])'
None of the functions with this name in scope match the target type

// functions prototypes
void funcv (int n,float x[],float f[]);

void test (float x[], int n, int *check,
void (*vecfunc) (int, float [], float []));

How can I correct the functions prototypes to get a correct compilation ?

Thanks,

Claude

David Crow12-May-03 4:29

12-May-03 4:29

You haven't provided enough information. The compiler is not complaining about the prototypes. Show us the code snippet that calls the offending function (i.e., funcv, test).

Claude Gagnon12-May-03 4:42

Claude Gagnon

12-May-03 4:42

Hi,

The function test is called like this:

CBroydn Broydn;

Broydn.test(x,N,&check,funcv);

I have to add that this code was working when I was utilizing thes functions inside a DLL.
Now I want to get out this code from the DLL. and I get this compile error c2664.

Thanks,

Claude

G. Steudtel12-May-03 4:51

G. Steudtel

12-May-03 4:51

A hint might be the fact, that the compiler complains about converting a void parameter to a __cdecl function pointer returnig void. Looks to me, that the function prototype of 'funcv' is different. Probably of type pascal or samoething like that.

G. Steudtel

Re: Fix SQLStatement error ?

Jason Henderson12-May-03 7:00

Jason Henderson

12-May-03 7:00

Show the protypes for funcv.

I think to use class methods as function pointers, you need to make the method static.

Jason Henderson

My articles

"The best argument against democracy is a five-minute conversation with the average voter." - Winston Churchill

Using Updated Interface

swarup12-May-03 3:17

swarup

12-May-03 3:17

The interface IShellDispatch,has an updated interface named IShellDispatch2.
How to invoke IShellDispatch2 and all the members method.

Swarup

Fix SQLStatement error ?

_skidrow_vn_12-May-03 3:14

_skidrow_vn_

12-May-03 3:14

#define	MY_SQL "INSERT INTO MyTable ([fldFileName]) VALUES ('%s')"<br />
sprintf(szStmt,MY_SQL, "Greensleeves.mp3");		<br />
SQLExecDirect(hStmt, (SQLTCHAR*)szStmt, SQL_NTS);<br />
//=> "INSERT INTO MyTable ([fldFileName]) VALUES ('Greensleeves.mp3')"<br />
//=> OKAY => because "Greensleeves.mp3" do not contain ' char<br />
<br />
#define	MY_SQL "INSERT INTO MyTable ([fldFileName]) VALUES ('%s')"<br />
sprintf(szStmt,MY_SQL, "Souvenirs d'enfance.mp3");	<br />
SQLExecDirect(hStmt, (SQLTCHAR*)szStmt, SQL_NTS);<br />
//=> "INSERT INTO MyTable ([fldFileName]) VALUES ('Souvenirs d'enfance.mp3')"<br />
//=> ERROR => because "Souvenirs d'enfance.mp3" contain ' char => impact with '%s'

Could you help me to fix this bug Confused | :confused:

thank a lot!!!

basementman12-May-03 5:28

basementman

12-May-03 5:28

You should really have some sort of DB class that would automatically handle this kind of stuff for you, including replacing NULLs and such. An example would be the following:

int ApplicationInstance::StringReplace(char *cpSearch, LPCSTR cpFind, LPCSTR cpReplace, BOOL bDisableNULLCheck /*=FALSE*/, BOOL bReplaceEmbeddedQuotes /*=FALSE*/)
{
if (!cpReplace || (*cpReplace == 0 && !bDisableNULLCheck))
return 0;

int iRetval = 0;
BOOL bDeleteBuf = FALSE;
char *cpReplaceBuf = (char *)cpReplace;

int iReplaceLength = strlen(cpReplaceBuf);
int iFindLength = strlen(cpFind);

if (bReplaceEmbeddedQuotes && strchr(cpReplaceBuf,'\''))
{
LPCSTR cpQuote = strchr(cpReplaceBuf,'\'');
while (cpQuote)
{
iReplaceLength++;
cpQuote = strchr(cpQuote+1,'\'');
}

cpReplaceBuf = new char[iReplaceLength+1];

if (!cpReplaceBuf)
return -1;

char *cpDest = cpReplaceBuf;
cpQuote = cpReplace;

while (*cpQuote)
{
*cpDest++ = *cpQuote;
if (*cpQuote == '\'')
{
*cpDest++ = '\'';
}

cpQuote++;
}

*cpDest = 0;

bDeleteBuf = TRUE;
}

BOOL bSmaller = (iReplaceLength <= iFindLength);

char *p = strstr(cpSearch,cpFind);
while (p)
{
iRetval++;

// move rest of string so that the replace value fits right in.
if (bSmaller)
strcpy(p+iReplaceLength,p+iFindLength);
else
memmove(p+iReplaceLength,p+iFindLength,strlen(p+iFindLength)+1);

memcpy(p,cpReplaceBuf,iReplaceLength);

p = strstr(cpSearch,cpFind);
}

if (bDeleteBuf)
delete [] cpReplaceBuf;

return iRetval;
}

How can I use system cmd without opening console?

YanivNahum12-May-03 3:11

YanivNahum

12-May-03 3:11

Hi,
I'd like to use system command but I don't like it to open console while the command is executing?
or if there is a c/c++ cmd for deleting all files in a directory like -
system("del /q *.*")

thanks
Yaniv

Re: How can I use system cmd without opening console?

swarup12-May-03 3:31

swarup

12-May-03 3:31

how about using ShellExecute method........

Swarup

Re: How can I use system cmd without opening console?

David Crow12-May-03 3:44