C / C++ / MFC

Tomasz Sowinski31-May-02 10:22

31-May-02 10:22

What's debugger? Can I use it with Visual Basic?

Tomasz Sowinski -- http://www.shooltz.com

- It's for protection
- Protection from what? Zee Germans?

soptest31-May-02 13:32

soptest

31-May-02 13:32

Are you from Moon or Mars?

soptest

Tomasz Sowinski31-May-02 22:43

31-May-02 22:43

soptest wrote:
Are you from Moon or Mars?

I'm from Mercury. And you?

Tomasz Sowinski -- http://www.shooltz.com

- It's for protection
- Protection from what? Zee Germans?

String Manipulation Problem

pnpfriend1-Jun-02 5:51

pnpfriend

1-Jun-02 5:51

i debug it. that's how i found out the function need to recode for xp.
after changing my code, it return true for both xp and 2000.
but i just don't understand why on 2000, the function return true but false on xp

Sidney31-May-02 8:36

Sidney

31-May-02 8:36

Hi everyone,

can anybody here help me on how to solve my problem? I'm new to c++, how can I extact a string on a string? Example:

char *str1;

str1 = "The Quick Brown Fox Jumps Over The Lazy Dog";

How can I extract the "Brown" string from str1??? and assign it into a new variable like str2 perhaps. In VB you'll just use the MID(sting,start,len) function... is there a MID like function in C or C++??

I will really appreciate any idea that you may give.

Thanks/Regards
Sidney

Thanks/Regards
Sidney

Navin31-May-02 8:57

Navin

31-May-02 8:57

Are you using MFC?

If so, you can use CString function Mid, for instance:

<br />
CString str1;<br />
str1 = "The Quick Brown Fox Jumps Over The Lazy Dog";<br />
<br />
CString str2 = str1.Mid(10,5);    // I hope I didn't miscount.. :)<br />

I love CString. Big Grin | :-D

If you are using stl, there are similar functions there I think, but I don't know stl well enough. Now if you are not using MFC or stl, you can do it in a loop.

<br />
char str2[6];      // Length of 5, plus the ending null character<br />
for(int i = 0; i < 5; i++)<br />
   str2[i] = str1[10 + i];<br />
<br />
str2[5] = '\0';    // All strings must end with this character<br />

I'm sure there are other ways, too.

No generalization is 100% true.
Not even this one.

Jonathan Craig31-May-02 9:45

Jonathan Craig

31-May-02 9:45

There is a standard C/C++ function called strstr(...) that will work for char strings. Also see the MSDN article String Manipulation for a complete list of functions.

Keep Hacking...

Jonathan Craig
www.mcw-tech.com

Navin31-May-02 10:16

Navin

31-May-02 10:16

Yes, but strstr will search for a substring within a string. I think what was needed was to grab a specific chunk (e.g., start at the 5th char, and get 4 more chars), which is a little different.

No generalization is 100% true.
Not even this one.

Sidney31-May-02 11:37

Sidney

31-May-02 11:37

Yes strstr is fine... but I need to extract with offsets, I need to especify the starting point and the length. like MID in VB. But again I cant use CString co'z I'm doing my progrtam in STL, is it possible to use CString in STL programs??

Thanks/Regards
Sidney

"right way" to display hex number in edit

Christian Graus31-May-02 13:09

Christian Graus

31-May-02 13:09

No-one does anything 'in' STL. The standard template library is part of standard C++ and is available to ALL C++ programs. The std::string class exposes iterators and is therefore considered by some to be a part of STL. I guess it is a specialisation - a container that holds characters.

CString is part of MFC, and can be used in MFC programs. Many classes exist online that emulate CString's functionality for non-MFC programs.

std::string has a substr method which takes and returns exactly what you want

std::string s("Gargle Mouse");

MessageBox(0, s.substr(5, 5).c_str(), "", 0);

should ( I am doing this untested ) bring up a dialog that said 'le Mo'.

Christian

I am completely intolerant of stupidity. Stupidity is, of course, anything that doesn't conform to my way of thinking. - Jamie Hale - 29/05/2002

BlackDogEngineering31-May-02 8:34

BlackDogEngineering

31-May-02 8:34

I have an edit box that I want to display a number in. I have a member variable (m_var1) assigned to that edit box of type int. So to display a number in that edit box, it only requres a simple assignment:

m_var1 = 36;

But I want the display to be in hex ( e.g. "0x%04x" ).

Obviously I can instead use a member variable of type CString and format the numeric value the way I want.

BUT: is there a _better_ way?

Ron

Re: "right way" to display hex number in edit

Ravi Bhavnani31-May-02 8:59

Ravi Bhavnani

31-May-02 8:59

BlackDogEngineering wrote:
BUT: is there a _better_ way?

I think you have no choice but to format the number as a string and display that. Why not link a CString to the edit control?

/ravi

"There is always one more bug..."
http://www.ravib.com
ravib@ravib.com

Re: "right way" to display hex number in edit

Michael Dunn31-May-02 11:46

Michael Dunn

31-May-02 11:46

The only improvement is to use "%#04x" to automagically add the 0x prefix. Wink | ;)

--Mike--
Just released - RightClick-Encrypt - Adds fast & easy file encryption to Explorer
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My really out-of-date homepage
Sonork - 100.10414 AcidHelm

error C2660: 'new' : function does not take 3 parameters

Crystal31-May-02 8:37

Crystal

31-May-02 8:37

Can anybody tell me why I am getting this error for the following line:
graphics = new Graphics(hdcPrint);

For your information, this is my function:

// this function is for OTCDialog: OK button
// It uses GDI to send image to a printer
void OTRDialog::OnPrintFrom()
{
DWORD size;
HDC hdcPrint;

DOCINFO docInfo;
ZeroMemory(&docInfo, sizeof(DOCINFO));
docInfo.cbSize = sizeof(DOCINFO);
docInfo.lpszDocName = "GdiplusPrint";

// Create a PRINTDLG structure, and initialize the appropriate fields.
PRINTDLG printDlg;
ZeroMemory(&printDlg, sizeof(PRINTDLG));
printDlg.lStructSize = sizeof(PRINTDLG);
printDlg.Flags = PD_RETURNDC;

// Display a print dialog box.
if(!PrintDlg(&printDlg))
{
printf("Failure\n");
}
else
{
// Now that PrintDlg has returned, a device context handle
// for the chosen printer is in printDlg->hDC.

StartDoc(hdcPrint, &docInfo);
Graphics* graphics;

StartPage(hdcPrint);
graphics = new Graphics(hdcPrint);

Image image(L"My_report.bmp");
graphics.DrawImage(&image, 5, 0, 360, 410);

// Create a string.
WCHAR string[256];
wcscpy(string, L"Sample Text");

// Initialize arguments.
Font myFont(L"Arial", 6);
PointF origin(20.0f, 5.0f);
SolidBrush blackBrush(Color(255, 0, 0, 0));
// Draw string.
graphics.DrawString(string, wcslen(string), &myFont, origin, &blackBrush);
delete graphics;
EndPage(hdcPrint);

EndDoc(hdcPrint);

DeleteDC(hdcPrint);
}

if(printDlg.hDevMode)
GlobalFree(printDlg.hDevMode);
if(printDlg.hDevNames)
GlobalFree(printDlg.hDevNames);
if(printDlg.hDC)
DeleteDC(printDlg.hDC);
}

Re: error C2660: 'new' : function does not take 3 parameters

Ed Gadziemski31-May-02 11:15

Ed Gadziemski

31-May-02 11:15

How many parameters does the constructor for Graphics take? Sounds like your giving it less than the number required.

Re: error C2660: 'new' : function does not take 3 parameters

Christian Graus31-May-02 13:10

Christian Graus

31-May-02 13:10

It takes exactly what she is giving it - a HDC.

Christian

I am completely intolerant of stupidity. Stupidity is, of course, anything that doesn't conform to my way of thinking. - Jamie Hale - 29/05/2002

Re: error C2660: 'new' : function does not take 3 parameters

Ed Gadziemski31-May-02 14:47

Ed Gadziemski

31-May-02 14:47

DEBUG_NEW defines a new operator that takes three parameters to catch memory leaks when _DEBUG is also defined. Redefine it to use the non-debug new.

Or, use the scope resolution operator ( :: ) before new to use the default C++ version.

Re: error C2660: 'new' : function does not take 3 parameters

Christian Graus31-May-02 13:13

Christian Graus

31-May-02 13:13

1. Why does graphics have to be a pointer ? I seem to recall GDI+ does not like having new called on things in C++ ( new in C# is a totally different beast ), because it forces you to use it's .Clone methods instead.

2. Once you fix this, you'll get errors because you're using the . instead of the -> for the graphics object ( as it's a pointer ).

Christian

I am completely intolerant of stupidity. Stupidity is, of course, anything that doesn't conform to my way of thinking. - Jamie Hale - 29/05/2002

Re: error C2660: 'new' : function does not take 3 parameters

Ed Gadziemski1-Jun-02 4:07

Ed Gadziemski

1-Jun-02 4:07

Try this:

graphics = ::new Graphics(hdcPrint);

The problem is that an MFC generated define, DEBUG_NEW, defines a "new" operator that takes three parameters. It only applies for a debug build; if you do a release build your program should work. You can undefine DEBUG_NEW so that debug builds also work.

Or, as shown in the example code above, you can use the scope resolution operator ( :: ) before new to use the default C++ version.

How can I add a splash screen to my VC++.net porject???

chaolong31-May-02 8:13

chaolong

31-May-02 8:13

It like that there is no the splash screen compoent in
VC++.Net.How can I add a splash screen to my VC++.net porject??? Confused | :confused:

timespec equivalent in C++

lucy31-May-02 8:19

lucy

31-May-02 8:19

hi, is there any equivalent structure defined in C++ as that of timespec in Unix? the timespec definition is:
struct timespec {
long tv_sec; /* number of seconds */
long tv_nsec; /* number of nanoseconds */
};
I tried to search it in MSDN to no avail.

Frown | :(

Re: timespec equivalent in C++

Tomasz Sowinski31-May-02 8:17

Re: timespec equivalent in C++

31-May-02 8:17

Check FILETIME struct. It's not the exact equivalent, but uses 100-nanosecond intervals.

Tomasz Sowinski -- http://www.shooltz.com

- It's for protection
- Protection from what? Zee Germans?

lucy31-May-02 8:26

lucy

31-May-02 8:26

wow, this is fast. I fooled around in lounge for a while and when I was back, you have posted the answer. Salute!

Re: timespec equivalent in C++

Tomasz Sowinski31-May-02 8:25