Re: Ensuring the continuous physical allocation(storage) of a file in Hard disk - C / C++ / MFC Discussion Boards

Re: How to get text of special symbol font?

JoneLe865-Sep-13 21:51

JoneLe86

5-Sep-13 21:51

just wondering A or W? the third parameter (LPSTR) or (LPWSTR) check that out...

modified 6-Sep-13 3:58am.

Re: How to get text of special symbol font?

Richard MacCutchan5-Sep-13 22:05

Richard MacCutchan

5-Sep-13 22:05

You do not use GetDlgItemText() to get a ComboBox item. Please show the code you are using, and what actual results you see.

Veni, vidi, abiit domum

Re: How to get text of special symbol font?

yangdp15-Sep-13 22:54

yangdp1

5-Sep-13 22:54

Thanks for your answer
first:in CCombobox::DrawItem(LPDRAWITEMSTRUCT pDIStruct) function modified the dc font and dc.DrawText(str,itemRect,DT_LEFT|DT_VCENTER|DT_SINGLELINE);//显示文本
second: in mfc interface, display the special symbol.It's ok.e.g. input a "t",and display the special symbol.
third: how to get the special symbol string? E.g. is the "t" string,but other string.

Sorry!

Re: How to get text of special symbol font?

Richard MacCutchan5-Sep-13 23:40

Richard MacCutchan

5-Sep-13 23:40

Sorry but I did not understand that at all.

Veni, vidi, abiit domum

Converting std::vector<BYTE> to CString

Don Guy5-Sep-13 13:13

Don Guy

5-Sep-13 13:13

Hello there,

Is there a way i can convert a std::vector<byte> to MFC CString?

Also, Is there a way to convert std::string to MFC CString?
When i use,
std::string s;
CString str(s.c_str());

I see that it's not copying all the contents of std::string to CString.

Thanks in advance.

Re: Converting std::vector<BYTE> to CString

Richard MacCutchan5-Sep-13 22:03

Richard MacCutchan

5-Sep-13 22:03

Don Guy wrote:
Is there a way i can convert a std::vector<byte> to MFC CString?

Yes, but you would need to write the code to make append vector item to the string in turn.

Don Guy wrote:
I see that it's not copying all the contents of std::string to CString.

You need to provide more information; show your code, and the values of all variables.

Veni, vidi, abiit domum

Ensuring the continuous physical allocation(storage) of a file in Hard disk

VCSharp0075-Sep-13 8:41

VCSharp007

5-Sep-13 8:41

Hi,
I have a requirement.

1) Create a 4 GB data file in Hard disk by writing 2 MB at time. ( Don't worry, that I can manage Smile | :)

)
2) It should be stored in continous locations( clusters ) in hard disk. Is their any method to ensure that?

Regards,
VCSharp

Re: Ensuring the continuous physical allocation(storage) of a file in Hard disk

jschell5-Sep-13 9:23

jschell

5-Sep-13 9:23

You would need to access the disk io API directory. Then via that
1. Find the contiguous clusters.
2. Mark them in use
3. Attach them to a file
4. Then write to the file, being careful to not exceed the maximum.

Naturally the application must also have permissions to access the API.

Streaming Image File from MFC app to HTML Page

Don Guy4-Sep-13 11:59

Don Guy

4-Sep-13 11:59

Hey there,

I am working on an MFC app that uses CDHtmlDialog class to create a dynamic HTML page.

Now i want to pass/stream a image pointer to the HTML page to show it to the users.

The image will be stored in the hard disk, and the MFC should have a way of streaming this to the HTML page for display on a particular user event.

I am not sure how to convert a JPG or GIF file into something else that i can pass to the HTML page.

Possibly as an argument to JavaScript function residing in the HTML page.

Any help is welcome. Please guide with sample codes.

Thanks in advance.

Re: Streaming Image File from MFC app to HTML Page

Stephen Hewitt4-Sep-13 18:50

Stephen Hewitt

4-Sep-13 18:50

If it's a file on the HD simply use an image tag with a file URL[^].

Steve

Re: Streaming Image File from MFC app to HTML Page

Richard MacCutchan4-Sep-13 21:03

Richard MacCutchan

4-Sep-13 21:03

Lots of useful resources, articles and videos at https://www.google.com/search?q=CDHtmlDialog[^].

Veni, vidi, abiit domum

How to change regional and location setting in C++

Andraw1114-Sep-13 8:51

Andraw111

4-Sep-13 8:51

Hi, dear all,

I have a program created using C++ MFC which works fine in USA, but when this program is used in Europe like Norway, the data is messed up. What I want to do is set the regional and location to US English always when program executes, how can I do it? Thanks you very much!

Re: How to change regional and location setting in C++

David Crow4-Sep-13 17:44

David Crow

4-Sep-13 17:44

Is setlocale() or SetThreadLocale() of any help?

"One man's wage rise is another man's price increase." - Harold Wilson

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enum

Member 102527964-Sep-13 6:21

Member 10252796

4-Sep-13 6:21

what are enumerator and how it is different from struct & class
please explain all with some examples . i am beginner in c++

Re: enum

Richard MacCutchan4-Sep-13 8:08

Richard MacCutchan

4-Sep-13 8:08

This sort of question is best answered by looking at the official documentation[^].

Veni, vidi, abiit domum

How to genrate variable sound?

Vaclav_3-Sep-13 12:42

Vaclav_

3-Sep-13 12:42

I need to generate variable sound ( system speaker is fine for now) , both in frequency (audio) and length (code). I do some processing in worker thread and I did tried Beep in worker thread , it is synchronous ( not really an issue) but it terminates the thread when completed. No good.

I tried MessageBeep and it did not do a thing, wrong audio anyway.

So is PlaySound (from a file) my only choice and if so how do I control the length of the "play"?

Any constructive suggestions are as always appreciated.
Cheers
Vaclav

Re: How to genrate variable sound?

David Crow3-Sep-13 16:47

David Crow

3-Sep-13 16:47

Vaclav_Sal wrote:
...how do I control the length of the "play"?

Have you experimented with the various SND_xxx flags?

Re: How to genrate variable sound?

Richard MacCutchan3-Sep-13 21:00

Richard MacCutchan

3-Sep-13 21:00

Vaclav_Sal wrote:
I did tried Beep in worker thread , it is synchronous ( not really an issue) but it terminates the thread when completed.

Beep does not terminate a thread, but your code may do so. You could easily write a method that repeatedly calls Beep and run it in a thread that does not terminate.

Veni, vidi, abiit domum

Re: How to genrate variable sound?

Vaclav_5-Sep-13 7:08

Vaclav_

5-Sep-13 7:08

Richard,
I'll get back to you on this one. The section of code in question is "broken".
I hope you are right and I had something else doing the deed.
But I checked elsewhere and really did not pull the silly idea of Beep terminating the thread out of my hat. Of course now I cannot find the source!
Right now I think the Beep is run in its own thread and what I saw in debug was message terminating that thread.
Thanks for your help.
Vaclav

Re: How to genrate variable sound?

Richard MacCutchan5-Sep-13 7:39

Richard MacCutchan

5-Sep-13 7:39

The problem is you never give us all the information necessary to try and offer suggestions. You stated earlier that Beep() terminates a thread, but now you cannot find the source. So we have no way of even guessing what your code may be doing.

Veni, vidi, abiit domum

enum usage question

econy3-Sep-13 10:07

econy

3-Sep-13 10:07

Hi,I read some articles, some say enum constant not ocuupy storage in memory, some say it does.

I wonder, for example, enum Weekday {sun,mon,tue,wen,thu,fri,sat}, then where is the Weekday be stored at?

And I want to declare a enum consant like:
enum XXYY {xx1=100,xx2=3000,yy1=4500,yy2=32}, is that ok? or
have to define: enum XXYY { xx1=32,xx2=100,yy1=3000,yy2=4500}?

Re: enum usage question

pasztorpisti3-Sep-13 11:38

pasztorpisti

3-Sep-13 11:38

The enum members can have any int value. All of them can have the same value, they can have random order.
The only two "rules" that you have to know: If you don't define the value of the first enum member then its automatically 0. If you don't define the value of any of the other non-first enum members then their value is automatically the value of the previous member + 1. Using enums to declare constants in header files (even inside classes) is a good old trick. If you use the enum just to define constants then you dont have to give a name for the enum itself:

C++

enum {
 val0 = 5,
 val1 = 1,
 val3 = 4,
};

EDIT: The weekday enum itself is just a type. A type doesn't occupy any memory. If you declare/define a variable of that enum type then the variable occupies some memory, the same amount as an int variable:

C++

// These VARIABLE DECLARATIONS occupy space somewhere in memory. The Weekday type itself doesn't.

Weekday wd;
void func()
{
   Weekday w;
   // In plain c you have to say
   enum Weekday ww;
}

class C
{
private:
   Weekday m_Weekday;
};

CamStudio Project - Runs But Gives Debug Assertions

Django_Untaken3-Sep-13 8:09

Django_Untaken

3-Sep-13 8:09

Hi all. I am trying to compile open source CamStudio project. I have been able to compile the project with no errors. But when I run it in debug mode, it gives 2 debug assertions.

1 - Debug Assertion Failed: ..... \atlmfc\include\afxwin1.inl Line: 24

2 - Debug Assertion Failed: ..... \src\mfc\docsingl.cpp Line: 219

3 - Unhandled Exceptions.

Now if I keep ignoring them, it runs the project. I can record my desktop, my voice etc. What could be the cause for these debug assertions and how to remove them. Thanks.

Re: CamStudio Project - Runs But Gives Debug Assertions

Richard MacCutchan3-Sep-13 9:23

Richard MacCutchan

3-Sep-13 9:23

Django_Untaken wrote:
What could be the cause for these debug assertions

Anything at all. You need to look at the code in order to find out what they are complaining of, and use your debugger to try and resolve them. However, since this is open source you would be better asking the question at the site where you got the code from.

Veni, vidi, abiit domum

Using CDHtmlDialog in MFC Dialog

Don Guy2-Sep-13 7:47

Don Guy

2-Sep-13 7:47

Hello all,

I am using CDHtmlDialog to create a simple MFC app. I want my app to do the following things.

Load images by using the MFC code to the DHTML page.

Change texts in the DHTML page using the MFC code.

Capture DHTML button cicks inside the MFC code and based on that change the images & texts.

For the 1 & 2 i am planning to do that inside a TIMER or Thread and dynmically change them for user.

I am able to make a simple app, but what am struggling with is changing the images & texts in DHTML page from the MFC code.

Can someone tell me how to do that?

A sample app or code will be great.

Thanks in advance.

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