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But there is no OnInitDialog() in my child dialog class!!
Even when I tried to override OnInitDialog (hoping it was there in CDialog) it did not have it already defined in the base class.
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Hello, the codegurus around the world.;)
You can manually add OnInitDialog() with WM_INITDIALOG.
Or use WM_INITDIALOG by the class wizard, and this automatically
generates the message and its handler in CChildDlg class.
Have a nice day!
-Masaaki Onishi-
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Well, here's the problem... the control hasn't been created yet! MFC's UI classes are really wrappers around the Win32 equivalents. Having constructed the class does not imply that the corresponding controls have been created. So what you want to do is the following:
(1) create a data member (a string or an array of strings maybe?) in your child dialog to hold the data thats going into the combo box.
(2) set this data member after you have created the child dialog but before the call to DoModal (DUH!)
(3) override OnInitDialog of the child dialog (or OnCreate if its not a dialog) to pass this data into the combo box using AddString or InsertString, whichever you prefer.
--update--
Oh bugger, Masaaki beat me to it.....  my link sux! 
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Hey,
I did as you told me. But now the application still mysteriously crashes.
What I want to do is that just before the child appears, a function in the main dialog box (the parent) provides the child with stuff the child needs to show in the combo box.
Since in the child I have a pointer to the parent, so I used it to call the function which should provide the child with the data for the combo box.
But somehow the application crashes!
Are we allowed to call other functions inside the OnInitDialog/OnInitInstance?
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Yes you are allowed to call other functions in those methods. But note that in your particular case, you should be using OnInitDialog instead of OnInitInstance
-- sample pulled from MSDN --
IMPT NOTE: Remember to call the base class' OnInitDialog as shown in the sample!!
#include "MyDialog.h"
BOOL CMyDialog::OnInitDialog()
{
CDialog::OnInitDialog();
m_cMyEdit.SetWindowText("My Name");
m_cMyList.ShowWindow(SW_HIDE);
return TRUE;
}
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The other replies have been hit-and-miss, so I'll summarize here.
You're confusing the dialog C++ object with the dialog window. The window does not get created until you call DoModal(). There is no dialog, and thus no controls to manipulate, before the DoModal() call.
The proper way is to override OnInitDialog() in your dialog's C++ class. At the time WM_INITDIALOG is sent, the window and all child controls have been created, but not yet shown. So at that time, it's fine to set up the controls.
--Mike--
http://home.inreach.com/mdunn/
While I can't be correct on all matters, I can make the reassuring claim that where I am inaccurate, I am at least definitively inaccurate.
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Sonork ID - 100.10414 AcidHelm
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I don't understand why you don't fill the combo box after the DoModal()..It's not a properly way but it is sure.
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Hello, the codegurus around the world.;)
Fisrt of all, we are talking about the initalization of the string
in ComboBox.
And, OnInitDialog() in the parent dialog of ComboBox is best location
to do that.
Second, the location after DoModal() means that ChildDlg will disapper
since ChildDlg is the modal dialog like the message box.
This means that as long as ChildDlg is opened (DoModal still works),
we can add the new strings to this ComboBox inside or outside this dialog
as long as we can get the right CWnd of ComboBox.
Have a nice day!
-Masaaki Onishi-
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Hi All, just a quick one - How can I change the font type and size that is used to display text in a combo box? At the moment my MDI App has one located in the MainFrame toolbar, but because the Arial font looks so pants its made my app look as though its been designed for Windows 3.x. Please help make my app look better,
Cheers Guys,
Alan.
"When I left you I was but the learner, now I am the Master" - Darth Vader
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Just as with any other window:
<br />
void CWnd::SetFont( CFont* pFont, BOOL bRedraw = TRUE );<br />
I vote pro drink
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Thanks for the response, however, I have inevitably reached a problem and my efforts have gone to no avail, please help. This is the code that has resulted from my patheticness in an attempt to get it going :
int CMainFrame::OnCreate(etc..)
stdFont.CreateFont(25,12,10,10,FW_THIN,FALSE,FALSE,FALSE,ANSI_CHARSET,OUT_OUTLINE_PRECIS,CLIP_DEFAULT_PRECIS,PROOF_QUALITY,0,"Times New Roman");
SetFont(&stdFont, TRUE);
Can you see where I`m going wrong with this? I`ve tried different values for the third and forth arguments, but the combo box still uses the same crappy font to display the strings!!! Also I have checked the return value of the CreateFont function and its 1, so it must be doing something? Any advice on my failings would be hugely welcomed.
Thanks again,
Alan.
"When I left you I was but the learner, now I am the Master" - Darth Vader
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Is stdFont defined locally to the OnCreate function, or is a member variable? If it's defined locally, then when OnCreate finishes, the CFont object is destroyed, so you end up with the crappy default font. I don't know if this is the problem, but I know I've done this a lot of times!
------------------------
Derek Waters
derek@lj-oz.com
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I found the answer, at last. I had been changing the MainFrame's standard font, and it was not being reflected in the combo box. As soon as I changed my code to m_ctlCombo.SetFont(&stdFont, TRUE), it worked! amazing! Many thanks to those of you who offered their advice on this, I very much appreciate it.
Cheers,
Alan.
"When I left you I was but the learner, now I am the Master" - Darth Vader
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Here's some code for changing the font in a combobox...
LOGFONT lf = { 0 };
(void)lstrcpy( lf.lfFaceName, _T("MS Sans Serif") );
lf.lfHeight = -MulDiv( 10, GetDeviceCaps( GetDC()->m_hDC, LOGPIXELSY ), 72 );
VERIFY( m_font.CreateFontIndirect( &lf ) );
m_ctlCombo.SetFont( &m_font );
Best regards,
Mark
www.mjsoft.co.uk
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Hi
I'm engaged in a project involving writting c code to solve the towers of hanoi problem as fast as possible. My goal is to be able to solve it with 30 rings in 1 second. Does anyone know of specific compiler command line switches to compile something to run faster or any good tutorials to assembler?
Zach
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I believe that optimise for size actually results in faster code a lot of the time. Look up /O switches in MSDN for the full list of available switch options.
The John Robbins book 'Debugging Applications' by M$ Press has an assembler section that is quite good, but as he says, it is usually doubtful that you'd outdo the compiler nowadays.
Christian
After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001
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I use the optimize for speed option most of time and I find that it also reduces the size considerably. I have run into optimizer bugs many times with heavy floating point code though so I have learned to be careful.
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The Towers of Hanoi problem is recursive - make sure you've implemented it properly, then optimise for size. A key optimisation might be taking the invariant out of your tight inner loops.
--
Andrew.
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Hey Guys
I am totally stuck i have a structure that is working fine of 3 TCHAR arrays but as soon as i add a 4th TCHAR array the structure causes the program to crash has anyonegot any ideas.
This is the Structure
struct CertificateNames
{
TCHAR sCommonName[STRING_LENGTH];
TCHAR sIssuerName[STRING_LENGTH];
TCHAR sFriendlyName[STRING_LENGTH];
};
The only thing i can think is that there is a set size for a structure.
STRING_LENGTH = 256
Cheers Guys
Peter
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You're obviously able to create a structure of four TCHAR's, you need to show us some code where it crashes to try and fix the problem.
Christian
After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001
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This is the Structure
struct CertificateNames
{
CERT_INFO CertID;
TCHAR sCommonName[STRING_LENGTH];
TCHAR sIssuerName[STRING_LENGTH];
TCHAR sFriendlyName[STRING_LENGTH];
};
As for what happens to it i only write values into the string arrays.
Cheers
Peter
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given that a CERT_INFO structure has variable size, have you tried putting it last in the structure ? Having still not seen your code, I'm guessing you're writing in the wrong spot somewhere, and given that the size of CERT_INFO can change by the size of rgExtension, it seems to make sense to me to put it at the end.
Christian
After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001
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Hey Christian
The problem happens even with out the CERT_INFO structure (which i have now removed anyway). It seems i can add anything else to the structure except another TCHAR array. As for the code where it is used the reason i haven't given you any is it literally is passed into a function and then data written into the string. Anyway this is one of the functions.
bool CCrypto::GetSubjectNameFromCert(PCCERT_CONTEXT pCertificate, CertificateNames *CertInfoStruct)//(PCCERT_CONTEXT pCertificate, TCHAR *sSignerName)
{
OSVERSIONINFO OSVersion;
GetVersionEx(&OSVersion);
SYSTEMTIME ExpireDateCert;
FILETIME ExpireDateCertUTC;
if(OSVersion.dwPlatformId == 4 && OSVersion.dwMinorVersion == 10)
{
CERT_NAME_BLOB CertSubjectNameBlob;
CERT_NAME_BLOB CertIssuerNameBlob;
TCHAR sCertificateName[BUFFER_LENGTH];
DWORD dwSizeOfsCertificateName = sizeof(sCertificateName);
TCHAR sCertificateCommonName[BUFFER_LENGTH];
bool bQuoteFlag = FALSE;
CertSubjectNameBlob = pCertificate->pCertInfo->Subject;
CertIssuerNameBlob = pCertificate->pCertInfo->Issuer;
CertNameToStr(X509_ASN_ENCODING, &CertSubjectNameBlob, CERT_X500_NAME_STR, sCertificateName, dwSizeOfsCertificateName);
for(int i = 0; i < BUFFER_LENGTH; i++)
{
if(sCertificateName[i] == 'C')
{
if(sCertificateName[++i] == 'N')
{
if(sCertificateName[++i] == '=')
{
++i;
for(int y = i, d = 0; y < BUFFER_LENGTH; y++, d++)
{
if(sCertificateName[y] == '"')
{
if(bQuoteFlag == TRUE)
{
bQuoteFlag = FALSE;
}
else
{
bQuoteFlag = TRUE;
}
}
if(sCertificateName[y] == ',' && bQuoteFlag == FALSE)
{
CertInfoStruct->sCommonName[d] = NULL;//sCertificateCommonName[d] = NULL;
break;
}
else
{
CertInfoStruct->sCommonName[d] = sCertificateName[y]; //sCertificateCommonName[d] = sCertificateName[y];
}
}
}
}
}
}
delete &CertSubjectNameBlob;
_strset(&sCertificateName[0], NULL);
CertNameToStr(X509_ASN_ENCODING, &CertIssuerNameBlob, CERT_X500_NAME_STR, sCertificateName, dwSizeOfsCertificateName);
for(int k = 0; k < BUFFER_LENGTH; k++)
{
if(sCertificateName[k] == 'C')
{
if(sCertificateName[++k] == 'N')
{
if(sCertificateName[++k] == '=')
{
++k;
for(int g = k, h = 0; g < BUFFER_LENGTH; g++, h++)
{
if(sCertificateName[g] == '"')
{
if(bQuoteFlag == TRUE)
{
bQuoteFlag = FALSE;
}
else
{
bQuoteFlag = TRUE;
}
}
if(sCertificateName[g] == ',' && bQuoteFlag == FALSE)
{
CertInfoStruct->sIssuerName[h] = NULL;//sCertificateCommonName[d] = NULL;
break;
}
else
{
CertInfoStruct->sIssuerName[h] = sCertificateName[g]; //sCertificateCommonName[d] = sCertificateName[y];
}
}
}
}
}
}
delete &CertIssuerNameBlob;
}
else
{
CertGetNameString(pCertificate, CERT_NAME_SIMPLE_DISPLAY_TYPE, 0, NULL, CertInfoStruct->sCommonName, STRING_LENGTH);
CertGetNameString(pCertificate, CERT_NAME_SIMPLE_DISPLAY_TYPE, CERT_NAME_ISSUER_FLAG, NULL, CertInfoStruct->sIssuerName, STRING_LENGTH);
CertGetNameString(pCertificate, CERT_NAME_FRIENDLY_DISPLAY_TYPE, CERT_NAME_ISSUER_FLAG, NULL, CertInfoStruct->sFriendlyName, STRING_LENGTH);
ExpireDateCertUTC = pCertificate->pCertInfo->NotAfter;
FileTimeToSystemTime(&ExpireDateCertUTC, &ExpireDateCert);
//GetDateFormat(NULL, 0, &ExpireDateCert, "MMM dd',' yyyy", CertInfoStruct->sDateCertExpires, STRING_LENGTH);
}
return 0;
}
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The problem is the structure seems to cause the problem on initalisation not when being passed or used in functions.
Peter
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You can test this - you can write a constructor for a struct. Do that and initialise the values to something sensible, then try creating an instance of the struct and display them.
Christian
After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001
Sonork ID 100.10002:MeanManOzI live in Bob's HungOut now
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