Re: CString question - urgent - C / C++ / MFC Discussion Boards

Michael Dunn25-Apr-05 6:17

25-Apr-05 6:17

See the FAQ
2.3 I'm trying to call a Windows API, but the linker gives an unresolved external error (LNK2001) on the API name. Why?[^]

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CString question - urgent

hithesh24-Apr-05 9:00

hithesh

24-Apr-05 9:00

I am trying clear a Cstring variable null. I tried NULL, didnt work.
I tried '\0' , worked but i can't append anything to the cstring.

I just need to make cstring variable blank(or clear it) and when user presses the number buttons, they are appended to the cstring variable.

Thanks in advance.

-hithesh

Re: CString question - urgent

PJ Arends24-Apr-05 9:04

PJ Arends

24-Apr-05 9:04

CString str;
str = _T("");

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Re: CString question - urgent

hithesh24-Apr-05 9:39

hithesh

24-Apr-05 9:39

Thanks. I just used quotes and it worked.

-hithesh

Re: CString question - urgent

Maximilien24-Apr-05 11:19

Maximilien

24-Apr-05 11:19

void CString::Empty();

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: CString question - urgent

hithesh24-Apr-05 15:44

hithesh

24-Apr-05 15:44

Two more cstring question-
How do I determine the length?
How do I compare individual elements of a cstring?

I am trying to find out the number of digits entered after the decimal point in a floating point number like 2.33

-hithesh

Re: CString question - urgent

ThatsAlok24-Apr-05 18:59

ThatsAlok

24-Apr-05 18:59

hithesh wrote:
How do I compare individual elements of a cstring?

CString::GetAt()

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cheers,
Alok Gupta

Re: CString question - urgent

toxcct24-Apr-05 20:44

toxcct

24-Apr-05 20:44

did you watch this ????

CString::length() -> returns the length of the string

if you like to compare 2 elements, you can use either operator[] () or GetAt()...

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[toxcct][VisualCalc]

Text Object Model

Jim Crafton24-Apr-05 8:57

Jim Crafton

24-Apr-05 8:57

I am trying to get the Text Object Model interfaces to work, but it seems that some of the functions simply do not work right.
According to the docs the ITextRange interface has a method called ITextRange::GetPoint() which, supposedly, will return the x,y coordinates of the range. You can specify a flag that is made of a series of bit flags that tell the function what the coords are for (the start or end) and whether you want the top, bottom, left/right, or baseline, center.
However no matter what you send in, the fucntion always returns E_FAIL as a HRESULT value. Does anyone have any experience using these API's? I'd love to be able to get this to work.

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Structions in Windows

Grahamfff24-Apr-05 8:52

Grahamfff

24-Apr-05 8:52

I have a series of structures overlayed with a buffer (fields and buffer of a message). This is in shared memory
Can someone tell me why the first method I use to set fields in a message do not work correctly.
Setting the time tag causes the year data to be wrong - data seems to be 8 bytes wide, even if you cast it to unsigned short.

// Each bit in the 64 byte message is defined in the structure (even spares etc)<br />
typedef struct{<br />
	unsigned long	Msg001_02_01_spare1_w01	:	2;<br />
	unsigned long	Msg001_02_01_msg_code_valid	:	1;<br />
	unsigned long	Msg001_02_01_msg_status	:	1;<br />
	unsigned long	Msg001_02_01_spare2_w01	:	4;<br />
	unsigned long	Msg001_02_01_spare3_w01	:	8;<br />
	unsigned short	Msg001_02_02_time_time_tag;<br />
	unsigned long	Msg001_02_03_year_1000_s	:	4;<br />
	unsigned long	Msg001_02_03_year_100_s	:	4;<br />
	unsigned long	Msg001_02_03_year_10_s	:	4;<br />
	unsigned long	Msg001_02_03_year_1_s	:	4;<br />
	unsigned long	Msg001_02_04_day_10_s	:	4;<br />
	unsigned long	Msg001_02_04_day_1_s	:	4;<br />
	unsigned long	Msg001_02_04_month_10_s	:	4;<br />
	unsigned long	Msg001_02_04_month_1_s	:	4;<br />
	unsigned long	Msg001_02_05_hour_10s	:	4;<br />
	unsigned long	Msg001_02_05_hour_1s	:	4;<br />
	unsigned long	Msg001_02_05_minute_10s	:	4;<br />
	unsigned long	Msg001_02_05_minute_1s	:	4;<br />
	unsigned long	Msg001_02_06_second_10s	:	4;<br />
	unsigned long	Msg001_02_06_second_1s	:	4;<br />
	unsigned long	Msg001_02_06_second_0_1s	:	4;<br />
	unsigned long	Msg001_02_06_second_0_01s	:	4;<br />
}Msg001_02;<br />
<br />
struct TSharedMemory {<br />
	// Form a union between the message structure and a buffer<br />
	union<br />
	{<br />
	    Msg001_02    	     fields;	// Fields in message<br />
	    unsigned short     buffer[32];	// Message buffer use in the Send/Recv etc<br />
	}Msg001_02;<br />
<br />
	etc ...<br />
};<br />
<br />
TSharedMemory	*g_pRigMem;		// Pointer to shared memory object<br />
<br />
		etc ..

If I use the following code to set the time tag it affects the year data:-

g_pRigMem->Msg001_02.fields.Msg001_02_02_time_time_tag = (unsigned short)timeMilseconds;

Even the following does the same:-

g_pRigMem->Msg001_02.buffer[1] = (unsigned short)timeMilseconds;

also the following code seems to do the same for fields in the next word?

g_pRigMem->Msg001_02.fields.Msg001_02_03_year_1000_s = year1000s;<br />
g_pRigMem->Msg001_02.fields.Msg001_02_03_year_100_s = year100s;<br />
g_pRigMem->Msg001_02.fields.Msg001_02_03_year_10_s = year10s;<br />
g_pRigMem->Msg001_02.fields.Msg001_02_03_year_1_s = year1s;

If however I set the void* to the location of the data in the shared memory and use the following code it works OK

// Set the void pointer up (fieldptr)<br />
<br />
if(m_sFieldType == "unsigned short")<br />
{<br />
	*(unsigned short *) fieldPtr = (unsigned short)(timeMilseconds);<br />
}

and for bit fields:-

// Set up the pointer to the byte that holds the field first<br />
<br />
*(char *) fieldPtr = (char)(bitField);

This sets the data OK and the years data is OK.

Can someone explain why the first method causes the problem.

Many thanks,

Graham.

grahamfff

Re: Structions in Windows

PJ Arends24-Apr-05 9:18

PJ Arends

24-Apr-05 9:18

Grahamfff wrote:
unsigned long Msg001_02_01_spare3_w01 : 8;
unsigned short Msg001_02_02_time_time_tag;
unsigned long Msg001_02_03_year_1000_s : 4;

I would make the time tag the same format as the rest

unsigned long Msg001_02_02_time_time_tag : 16;

Maybe also pack the structure and union to 1 byte boundaries using #pragma pack(1). You could be running into alignment problems.

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

"Obviously ??? You're definitely a superstar!!!" mYkel - 21 Jun '04

Within you lies the power for good - Use it!

Honoured as one of The Most Helpful Members of 2004

Compression

_Jackie24-Apr-05 8:16

_Jackie

24-Apr-05 8:16

Hi, i need for my final project to make a software that compress file, but i don't know where to start Confused | :confused:

, if someone know something about this, pls help me, i need it.

thanks
Jackie. Big Grin | :-D

Re: Compression

John M. Drescher24-Apr-05 9:20

John M. Drescher

24-Apr-05 9:20

You need to start by figuring out what algorithm you want/need to use. Huffman, LZW ... Then you can search this site for examples. Then if you do not find what you need there is always google.

John

Re: Compression

PJ Arends24-Apr-05 9:21

PJ Arends

24-Apr-05 9:21

http://www.google.ca/search?hl=en&q=compression+cpp+site%3Acodeproject.com&btnG=Search&meta=[^]

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

"Obviously ??? You're definitely a superstar!!!" mYkel - 21 Jun '04

Within you lies the power for good - Use it!

Honoured as one of The Most Helpful Members of 2004

vc++ progamming for multimedia

ahmadmz24-Apr-05 7:35

ahmadmz

24-Apr-05 7:35

why we use vc++ to programing multimedia player
WTF | :WTF:

Please Help me, Excel Automation with MFC

lee kyu sub24-Apr-05 6:27

lee kyu sub

24-Apr-05 6:27

(VC6.0, Excel 2000)

Range range;
Borders borders;
range = sheet.GetRange(COleVariant("A1"), COleVariant("L6"));
borders = range.GetBorders();
borders.SetLineStyle(COleVariant((short)1));

This sample is applied to all cells ..

but I want only outline

plese help me.... I want reference source...

help me about Explorer-like program

NPDemon24-Apr-05 5:59

NPDemon

24-Apr-05 5:59

i want to program a dialog-based program,which contains a CListCtrl ,i want the CListCtrl to act like MS ExPlorer
but i don't know how to do it.

someone can tell me how to do it ,or tell me this is about what subject,best some relative articles ?

thanks

Re: help me about Explorer-like program

Ravi Bhavnani24-Apr-05 7:40

Ravi Bhavnani

24-Apr-05 7:40

See this[^] article.

/ravi

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Re: help me about Explorer-like program

NPDemon29-Apr-05 8:45

NPDemon

29-Apr-05 8:45

thanks upper

CString to binary

Lampros Giampouras24-Apr-05 5:20

Lampros Giampouras

24-Apr-05 5:20

I need to convert CString to binary and back. Does anyone know how?

Re: CString to binary

Ravi Bhavnani24-Apr-05 7:43

Ravi Bhavnani

24-Apr-05 7:43

What do you mean by "convert a CString to binary and back"?

/ravi

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Re: CString to binary

Lampros Giampouras24-Apr-05 9:27

Lampros Giampouras

24-Apr-05 9:27

CString: "Hello there" -> Binary: 1001110100101001.....
Smile | :)

I want to take each bit of that and put it in some image pixels for watermarking..

API Hooking question

olinn24-Apr-05 4:40

olinn

24-Apr-05 4:40

I want to hook some APIs. I has some questions when reading the article on codeproject website
http://www.codeproject.com/dll/apihijack.asp[^]

The sample in that article is to hook DirectDrawCreate function in DDRAW.dll, and change it with his own function in his own dll. I am just wondering why he set a global WH_CBT hook but with a callback function doing nothing (just do CallNextHookEx).

When I made some mouse hook or keyborad hook, I always did my work in the callback function, so I am confused that why we changed when do API hooking.

Thanks in advance!

How to SetDocumentHtml to HtmlEditCtrl

Tcpip200524-Apr-05 2:16

Tcpip2005

24-Apr-05 2:16

I used SetDocumentHtml to set my html code to the HtmlEditCtrl.
but It's no use.
Why was this happen?
How can I set html document to htmleditctrl??
Thank you very much!!!

Re: How to SetDocumentHtml to HtmlEditCtrl

22491724-Apr-05 4:34

224917

24-Apr-05 4:34

I feel you got to check CHtmlEditCtrlBase::SetDesignMode().

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