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Hi David.
You are right!
This is the solution, at least with TRACE() an others functions.
Thank you very much.
Demian.
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corelibc.lib(pegwmain.obj) : error LNK2019: unresolved external symbol _WinMain referenced in function _WinMainCRTStartup
X86Dbg/image.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.
i have this kind of error message but i dont have any clue ... i think something wrong with the emulator ? im using eVC 3.0 and i try eVC 4.0 sp3 but same result....
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Just a guess - but it sounds like the project settings don't match reality - for instance, you have your project set up to build a Windows application, but you have coded a console application.
Sometimes I feel like I'm a USB printer in a parallel universe.
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Someone know where I can find same examples look at Extending the WAB (windows address book) Context Menu Actions
Tanks in advice.
Matteo
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Hello
I've got a vehicle class (cVehicle), and two 'heirs', car (cCar)and van (cVan). I store cars and vans in a list. The cvehicle class has a vehicle_type atribute (a char that is 'c' when it's a car and 'v' if it's a van). I want to take it out.
in the following code, i get a vehicle from a list. I don;t know if it's a car or it's a van. I use the vehicle_type atribute to see if it's a car, and if it is, i must return it.
<br />
cvehicle *vtemp=(list->Getvehicle());<br />
if (vtemp->get_vehicle_type()=='c')<br />
return vtemp;<br />
<br />
i've heard of a more elegant way to solve it, that is with the typeid operator. Do you know how to use it?
thanks!
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do you know MSDN ?
i cite :
typeid Operator
C++ Specific —>
<code>typeid( type-id )
typeid( expression )</code>
The <code>typeid </code>operator allows the type of an object to be determined at run-time.
The result of a <code>typeid </code>expression is a <code>const type_info&</code>. The value is a reference to a <code>type_info </code>object that represents either the type-id or
the type of the expression, depending on which form of <code>typeid </code>is used.
See type_info Class for more information.
END C++ Specific
here you are
TOXCCT >>> GEII power
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sorry, i'm new to c++ and i don't have msdn cds.
would you mind giving me an example of typeid usage, if it's not too much trouble?
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string clss;
if (typeid(obj)==typeid(int)) clss = "I";
else if (typeid(obj)==typeid(unsigned int)) clss = "i";
else if (typeid(obj)==typeid(float)) clss = "F";
else if (typeid(obj)==typeid(double)) clss = "D";
else if (typeid(obj)==typeid(short)) clss = "B";
else if (typeid(obj)==typeid(unsigned short)) clss = "b";
else if (typeid(obj)==typeid(long)) clss = "I";
else if (typeid(obj)==typeid(unsigned long)) clss = "i";
got the idea? 
Papa
while (TRUE)
Papa.WillLove ( Bebe ) ;
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i tried this but it doesn't work
cvehicle *vtemp=(list->Getvehicle());
if (typeid(vtemp)==typeid(ccar)))
return vtemp;
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just tried this and it works
CString temp;
CString temp1;
const type_info& t = typeid(temp);
AfxMessageBox (t.name ()); // It gave class CString
if(typeid(temp1) == typeid(CString))
AfxMessageBox ("Matched"); // It said matched
Check this too:
class Base { ... };
class Derived : public Base { ... };
void f()
{
Derived* pd = new Derived;
Base* pb = pd;
...
const type_info& t = typeid(pb); // t holds pointer type_info
const type_info& t1 = typeid(*pb); // t1 holds Derived info
...
}
(This is your prob, you should dereference the pointer)
What does yours do?
Papa
while (TRUE)
Papa.WillLove ( Bebe ) ;
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t and t1 are always diferent!
from the debugger:
t: + _m_d_name 0x00433890 ".PAVcvehicle@@"
t1: + _m_d_name 0x00433850 ".?AVccar@@"
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yes so check it against t1
dereference first the pointer you receive and then compare it to typeid(ccar)
Papa
while (TRUE)
Papa.WillLove ( Bebe ) ;
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Papa wrote:
dereference first the pointer you receive and then compare it to typeid(ccar)
what do you mean by this?
sorry, english isn't my first language
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cvehicle *vtemp=(list->Getvehicle());
if (typeid(*vtemp)==typeid(ccar)))
return vtemp;
Papa
while (TRUE)
Papa.WillLove ( Bebe ) ;
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it gives me an error: (runtime error, it builds alright)
unhandled exception
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"If the expression is dereferencing a pointer, and that pointer’s value is zero, typeid throws a bad_typeid exception. If the pointer does not point to a valid object, a __non_rtti_object exception is thrown."
Do you have a NULL pointer?
Papa
while (TRUE)
Papa.WillLove ( Bebe ) ;
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no, *vtemp isn't null
it gives me this warning
warning C4541: 'typeid' used on polymorphic type 'class ccar' with /GR-; unpredictable behavior may result
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typeid depends on RTTI being turned on. RTTI is part of the language standard but C++ turns it off by default. Change your project settings to enable RTTI and you will get rid of the compile-time warning and the run-time exception.
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that did it!!!!!!!!!!!!!1
thanks!!
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you deference a pointer when you don't get the address it contains but when you get what is at the pointed address.
<font style="color:blue;">char</font>* pc = (<font style="color:blue;">char</font>*)malloc(<font style="color:blue;">sizeof</font>(<font style="color:blue;">char</font>)); <font style="color:green;">
*pc = 'a'; <font style="color:green;">
pc : simple pointer (cointaining an address)
*pc : dereferenced pointer (value at the pointed address)
TOXCCT >>> GEII power
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Hi all,
Is there a way to respond to an external function call raised by another process without having to modify the callees's code?
Thanks.
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the "raising" process must send its PID however you won't be able to know who sent you such message.
TOXCCT >>> GEII power
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Does anyone see anything wrong with this code? It's called from an OnPaint handler that calls EnumChildWindows (this is the callback proc). Everytime it runs the program tells me that it hit a breakpoint, that I didn't set and, which is in assembly code, and then it terminates. The error code it terminates with is 0x80000003 which is "One or more argumets are invalid". Any ideas?
BOOL CALLBACK CInputDlg::RedrawErrors (HWND hWnd, LPARAM lParam)
{
CInputDlg* dlg = reinterpret_cast<CInputDlg*>(lParam);
TCHAR buff[32];
CWnd verify;
::GetClassName (hWnd, buff, sizeof (buff) - 1);
if (_stricmp (buff, "edit") != 0)
return TRUE;
verify.Attach (hWnd);
int id = verify.GetDlgCtrlID ();
if (id == IDC_TICKET) {
CVerifyData data (dlg->GetDlgItem (IDC_TICKET), Ticket, dlg);
if (data.GetErrorFlag () == CVerifyData::InvalidData)
data.ShowError ();
}
else if (id == IDC_CIRCUIT) {
CVerifyData data (dlg->GetDlgItem (IDC_TICKET), Circuit, dlg);
if (data.GetErrorFlag () == CVerifyData::InvalidData)
data.ShowError ();
}
else if (id >= IDC_CREATED && id <= IDC_DISPATCHED) {
CVerifyData data (dlg->GetDlgItem (id), Date, dlg);
if (data.GetErrorFlag () == CVerifyData::InvalidData)
data.ShowError ();
}
else if (id >= IDC_TICKET && id <= IDC_NOTES) {
CVerifyData data (dlg->GetDlgItem (id), Blank, dlg);
if (data.GetErrorFlag () == CVerifyData::InvalidData)
data.ShowError ();
}
return TRUE;
}
- Aaron
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Calling EnumWindows to validate / verify is not normal and definately should not be called from OnPaint.
Are you trying to validate / verify data while it is being input?
There are many handlers that can be used for the individual controls. If you handle EN_CHANGE then as each control it altered then you can perform your validation / verification.
Ant.
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That's not what I'm trying to do. The controls are validated elsewhere, the problem I'm encountering is that if a control contains invalid information a red * is put beside it. Now if the dialog is covered by another window or minmized, etc the red *'s disappear because they are not redrawn. The code I showed above doesn't actually validate anything, it just checks to see if the control has invalid or valid data.
- Aaron
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