C / C++ / MFC Discussion Boards

tilli again2-Mar-03 23:03

tilli again

2-Mar-03 23:03

Hey everyone!

I put myself a string class in C++ together, and now I want an easy way to initialize it with some string. One thing is the constructor that takes a LPCTSTR-type as an argument, in the fashion of cString (LPCTSTR somestring). Now I'd like to be able to do something like:

cString *bunchachars = new cString ();
bunchachars = "Now here comes the filling";

I did a little of research on the internet, and two terms I came across (that I could imagine being applied here) were the = operand and the cast-constructor. Can anyone give a little detail on this, or just tip me into the right direction?

cheers
tilli

Re: C++: Doing the right construction work

jhwurmbach2-Mar-03 23:10

jhwurmbach

2-Mar-03 23:10

tilli again wrote:
Can anyone give a little detail on this, or just tip me into the right direction?

You should REALLY read the code of the std::string class (and its definition http://www.sgi.com/tech/stl/)as well as the CString-code from MFC.
There is no point in reinventing the wheel - at least interface-wise.

My opinions may have changed, but not the fact that I am right.

Re: C++: Doing the right construction work

tilliagain3-Mar-03 0:10

tilliagain

3-Mar-03 0:10

Well, I'm writing my own Win32 API wrapper, just for not having to use MFC (personal choice and just a fun thing). I don't wanna end up having to use any of these huge libraries. Still, it might make sense to see how it was done in the std::string class, thanks for the hint!

Re: C++: Doing the right construction work

Alvaro Mendez3-Mar-03 4:37

Alvaro Mendez

3-Mar-03 4:37

From the looks of it, you're coming from some garbage-collected language such as Java or C#. In C++ you can allocate objects on the stack just like ints and longs. So you can do this:

// Create and then assign -- requires an LPCTSTR assignment operator
cString str;
str = "whatever";

// These two are equivalent -- requires an LPCTSTR constructor
cString str = "whatever";
cString str("whatever");

If you have a pointer, like in your example, you must "dereference" it:

cString *bunchachars = new cString;   // note: no parenthesis
*bunchachars = "Now here comes the filling";

Regards,
Alvaro

There are no stupid questions, but there are a lot of inquisitive idiots. -- despair.com

problem on get the text from other window

kbyiu2-Mar-03 20:20

kbyiu

2-Mar-03 20:20

I've successfully use GetCursorPos() and WindowFromPoint() to get the window handle. Then I use SendMessage() to send "WM_COPY" to that application, so that I can copy the selected text to the clipboard for my application. This method success in notepad. But when I try this method in openoffice, it failed. Cry | :((

Openoffice seems doesn't accept the message "WM_COPY". Does anyone know how can I get the selected text from openoffice? Confused | :confused:

Thanks a lot. Blush | :O

Re: problem on get the text from other window

Tony Chung : )2-Mar-03 20:24

Tony Chung : )

2-Mar-03 20:24

What about other application like MS IE and outlook express? Blush | :O

Re: problem on get the text from other window

kbyiu2-Mar-03 22:07

kbyiu

2-Mar-03 22:07

MS IE and Netscape failed using this method.
But MS Word is okay. Dead | X|

gprof on windows

PrashantJ2-Mar-03 19:58

PrashantJ

2-Mar-03 19:58

Please let me know if you have any tool like grpof (in linux) on windows, which gives the detailed timing analysis.
Also need some tool which gives the detailed timing analysis in VC++ code.

Re: gprof on windows

Neville Franks2-Mar-03 21:49

Neville Franks

2-Mar-03 21:49

I use Glowcode for this. It does a good job of showing bottlenecks, and also locating resource leaks etc. See http://www.glowcode.com[^]

Neville Franks, Author of ED for Windows. www.getsoft.com
Make money with our new Affilate program

Re: gprof on windows

Johnny ²2-Mar-03 21:50

Johnny ²

2-Mar-03 21:50

Visual Studio has its own profiler - you can enable it by changing the project settings

Re: gprof on windows

Steve S3-Mar-03 0:51

Steve S

3-Mar-03 0:51

But it isn't available in all VC++ 6.0 flavours; I have MSDN Enterprise, but I don't think it's available in the "Learning" or Personal edition, whatever it's called.

Steve

Steve S
[This signature space available for rent]

Error with ShellExecute(),WinExec() & CreateProcess()

Hemant kulkarni2-Mar-03 19:36

Hemant kulkarni

2-Mar-03 19:36

I am using ShellExecute() function to open MSPaint from my MFC application. This opnes paint successfully,but gives
debug assetion failure error to my application.
this happnes with ShellExecute(),Winexec() & CreateProcerss()
What is going wrong?
My PC configuration is
OS->win98
RAM 128MB
VC6.0
PIII processor 533
Cry | :((

Re: Error with ShellExecute(),WinExec() & CreateProcess()

KarstenK2-Mar-03 21:31

KarstenK

2-Mar-03 21:31

Youre string operation seems to be buggy. Try: GetBuffer and GetLength operations.
The first thing should be start the app without params, than build the more complex thing.
What replies GetLastError() and haven´t you set all the flags of the command right?

Try this @ home. (B&B)

Re: Error with ShellExecute(),WinExec() & CreateProcess()

Neville Franks2-Mar-03 21:53

Neville Franks

2-Mar-03 21:53

Run the debug build in the debugger, press Retry at the Assert and then you will see what the complaint is about and should be able to fix it.

Neville Franks, Author of ED for Windows. www.getsoft.com
Make money with our new Affilate program

about efficiency

metalstorm2-Mar-03 19:25

metalstorm

2-Mar-03 19:25

Pleae tell me which one of the following programs is most efficient,thanks.
1.
#include <iostream.h>
class A
{
public:
int x ;
A(int i) { x=i ; }
} ;

void main()
{
int i;
cout <<"Enter i " ;
cin>>i ;
A a(i);
cout << "a.x=" << a.x << endl ;
}

2.
#include <iostream.h>
class A
{
public:
int x ;
A(int i) : x(i) {}
} ;

void main()
{
int i;
cout <<"Enter i " ;
cin>>i ;
A a(i);
cout << "a.x=" << a.x << endl ;
}

3.
#include <iostream.h>
class A
{
public:
int x ;
} ;

void main()
{
int i;
cout <<"Enter i " ;
cin>>i ;
A a ;
a.x=i ;
cout << "a.x=" << a.x << endl ;
}

Re: about efficiency

Christian Graus2-Mar-03 19:30

Christian Graus

2-Mar-03 19:30

None of them are standard C++, because they either won't compile, or you included iostream.h, which is not part of standard C++. Inclide iostream instead, and put using std::cout;, etc. for the bits you want to use.

Also, void main is not valid C++, main must return int.

I doubt any of them is more efficient in any real terms.

Christian

NO MATTER HOW MUCH BIG IS THE WORD SIZE ,THE DATA MUCT BE TRANSPORTED INTO THE CPU. - Vinod Sharma

,a quick queston regarding files

r i s h a b h s2-Mar-03 19:19

r i s h a b h s

2-Mar-03 19:19

dear all,
how can i get the Last Modification Date Of any File (Not the Creation date) using API.

thanx Rose | [Rose]

Re: ,a quick queston regarding files

Joan M2-Mar-03 20:44

Joan M

2-Mar-03 20:44

Easy one! : take a look at

BResultGetFileTime = GetFileTime(hFile,&ftCreacio,&ftDarrerAcces,&ftLastModification);

Hope this helps...

Re: ,a quick queston regarding files

KingsGambit2-Mar-03 22:14

KingsGambit

2-Mar-03 22:14

You can use the CFileStatus class along with CFile::GetStatus function to get the modified time. CFileStatus class contains a CTime member m_mtime.

Exe With Exports

vikramlinux2-Mar-03 18:43

vikramlinux

2-Mar-03 18:43

Is it possible to built an EXE File With Exports? Forget about COM server Exes... Hmmm | :|

Vikrams

Re: Exe With Exports

KingsGambit2-Mar-03 19:21

KingsGambit

2-Mar-03 19:21

Yes it is quite possible to export functions from an exe as we export from a dll. You can add global function in your exe and use the extern "C" _declspce(dllexport) with the function declaration.

use loadLibrary and GetProcAddress to load this exe and call the exported function in it. Don't forget the declare the function before using it by using the keyword _declspec(dllimport).

Re: Exe With Exports

vikramlinux2-Mar-03 19:45

vikramlinux

2-Mar-03 19:45

I declared one funcion into my win32 EXE as

extern "C" __declspec(dllexport) void Function(void){
MessageBox(NULL,"","",MB_OK);
}

and user in other win32 EXE as

typedef void (*FUNCTION)();
FUNCTION Function=NULL;
HINSTANCE MyInstance=LoadLibrary ("c:\\ExeFile.exe");
if(MyInstance){
Function=(FUNCTION)GetProcAddress(MyInstance,"Function");
if (Function)
{
Function();
}

But It Gives me access violation Error... Frown | :(

Vikramvs

Re: Exe With Exports

KingsGambit2-Mar-03 22:11

KingsGambit

2-Mar-03 22:11

Instead of the MessageBox, if you return some value, it will work. So, based on this return value you can display the message box in your application.

Invoke Help File when F1 is pressed

Kamesh2-Mar-03 18:19

Kamesh

2-Mar-03 18:19

I would like to invoke help file of my application when F1 is pressed by user. System is trying to open Windows Help when i press F1 Any suggesstions.

With Thanks & Regards
--Kamesh

Re: Invoke Help File when F1 is pressed

KingsGambit2-Mar-03 18:34

KingsGambit

2-Mar-03 18:34

Add message map for the command ID ID_HELP in your application.
Like, ON_COMMAND(ID_HELP, OnMyHelpFun). Inside OnMyHelpFun, you can add code for invoking the help file.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.