Re: Some help for Loop's - C / C++ / MFC Discussion Boards

Fernando A. Gomez F.25-Nov-04 7:57

25-Nov-04 7:57

Hello all. I'm using Windows' GetFileSize function to get the file size:

<br />
HANDLE hFile	  = 0;<br />
DWORD  dwLowSize  = 0;<br />
DWORD  dwHighSize = 0;<br />
QWORD  qwTotSize  = 0; // typedef unsigned __int64 QWORD;<br />
<br />
hFile = CreateFile(m_pFileInfo->szFileName, GENERIC_READ, FILE_SHARE_READ,<br />
    NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);<br />
dwLowSize = GetFileSize(hFile, &dwHighSize);<br />
CloseHandle(hFile);<br />

Now, I goy dwLowSize and dwHighSize. How can I get the __int64 value of the both? How should I combine dwLowSize and dwHighSize in order to get the complete size of the file?

Thanks.

KK.

Hear my words, that I might teach you,
Take my arms, that I might reach you,
but my words like silent raindrops fell,
echoed the will of silence...

Re: GetFileSize

Joaquín M López Muñoz25-Nov-04 8:11

Joaquín M López Muñoz

25-Nov-04 8:11

ULARGE_INTEGER li;
li.LowPart=dwLowSize;
li.HighPart=dwHighSize;
__int64 i=li.QuadPart;

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
Want a Boost forum in Code Project? Vote here[^]!

Re: GetFileSize

Archer28225-Nov-04 17:32

Archer282

25-Nov-04 17:32

im thinking you could do this, (looked at MAKELONG, MAKEWORD macros)

#define MAKEQWORD(a, b) ((QWORD)(((DWORD)(a)) | ((QWORD)((DWORD)(b))) << 32))

qwTotSize = MAKEQWORD( dwLowSize, dwHighSize );

Some help for Loop's

faroqtam25-Nov-04 7:56

faroqtam

25-Nov-04 7:56

Hi
I need some help for the follwoing state.
when i use for(....)
statement the CPU prformance becomes 100%
when i use Sleep(..) function the program performance becomes more slower.

i need some techinques for using loop with large rang with minmal CPU performance .

plesea some help.

thanx alot
BY.

On Earth nothing impossible,
while your mind running.

Faroqtam

Re: Some help for Loop's

John R. Shaw25-Nov-04 9:11

John R. Shaw

25-Nov-04 9:11

If you are processing a lot of data, Sleep is about your only choice. You must chose between fast data processing and program performace. It is all a balancing act; a single CPU can only do so much and every but wants a slice of its time. The best you can do is to run profiling to see where the bottle necks are (slow code) and optimize those functions that are taking to long to do there job.

Good Luck!

INTP
"The more help VB provides VB programmers, the more miserable your life as a C++ programmer becomes."
Andrew W. Troelsen

Re: Some help for Loop's

Maximilien25-Nov-04 9:26

Maximilien

25-Nov-04 9:26

What exacly you want to do ?

why would you want to use Sleep ? it will stop the loop from looping ( and suspend the application ).

If the software loops, and is taking 100% of the CPU, it is because the OS decided that nothing else important needs the CPU;

I'm not sure what you mean by "minmal CPU performance" ? even a low priority process will be put to work when nothing else happens.

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: Some help for Loop's

Ravi Bhavnani25-Nov-04 9:27

Ravi Bhavnani

25-Nov-04 9:27

See the section "Responding to user input while performing a long task" in this[^] article.

/ravi

My new year's resolution: 2048 x 1536
Home | Articles | Freeware | Music
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Re: Some help for Loop's

faroqtam27-Nov-04 4:36

faroqtam

27-Nov-04 4:36

Hi .
Thanx alot.

On Earth nothing impossible,
while your mind running.

Faroqtam

Re: Some help for Loop's

namaskaaram25-Nov-04 22:42

namaskaaram

25-Nov-04 22:42

well if the processing that u want to is not that important ,give ur code in the OnIdle() function.....
maybe that could help..... Unsure | :~

Re: Some help for Loop's

toxcct25-Nov-04 23:22

toxcct

25-Nov-04 23:22

set a timer to perform your task at a time interval without using CPU when your program's not running (active loops are bad for that).

TOXCCT >>> GEII power
[VisualCalc]

CStatic:SetIcon() How to put large icon on dialog

Anonymous25-Nov-04 7:11

Anonymous

25-Nov-04 7:11

I have a CStatic control on a dialog which I use to display an icon and I want to set the size of the icon to large. Now it display at 32x32 but I want 48x48 or bigger. How can I do this?

Thank you Smile | :)

Selecting the word at mouse cursor position

dlarkin7725-Nov-04 6:29

dlarkin77

25-Nov-04 6:29

Hi,

Can anybody help me with the following:

I have a Dialog with CRichEditCtrl. When I right-click the mouse inside the CRichEditCtrl a popup menu appears with one menu item called "Select Text". When the "Select Text" is clicked I want to highlight the text before the mouse cursor position.

I have created the popup menu that appears when the right mouse button is clicked. How can I highlight the text? Confused | :confused:

Thanks very much,

dlarkin77

Re: Selecting the word at mouse cursor position

John R. Shaw25-Nov-04 6:55

John R. Shaw

25-Nov-04 6:55

CRichEditCtrl::GetSel() EM_EXGETSEL
CRichEditCtrl::SetSel() EM_EXSETSEL

To select all the text before the current caret positon:

GetSel(nStartChar, nEndChar);
SetSel(0, nEndChar);

Should do it!

INTP
"The more help VB provides VB programmers, the more miserable your life as a C++ programmer becomes."
Andrew W. Troelsen

dll project does not produce library (.lib)

AssemblySoft25-Nov-04 6:24

AssemblySoft

25-Nov-04 6:24

Hi i've come across this before and had to re-create the project to get it to work.

I've created a new win32 dll project with VC++6. (No MFC)
It's a simple utils dll with just functions, no DLLMain, Attach etc..

Upon build of the app, no .lib file is being created.

I am exporting a function.
(__declspec(dllexport) int logEvent(char* logFile,char* event,bool bLog);)

Can someone tell me why it isn't producing the .lib file.?
Can i use 'lib' to force this creation?

thanks in advance

Carl

below is the linker options from VS:

kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib<br> odbccp32.lib /nologo /dll /incremental:yes /pdb:"Debug/assemblyUtils.pdb" /debug /machine:I386 /out:"Debug/assemblyUtils.dll" /implib:"Debug/assemblyUtils.lib" /pdbtype:sept

Re: dll project does not produce library (.lib)

AssemblySoft25-Nov-04 6:35

AssemblySoft

25-Nov-04 6:35

Answer:

Well it seems i didn't add the header file in the cpp to the exported declaration of the function. Even though it compiled, nothing was being exported.

added the header and bobs your aunty betty!

thanks to myself Wink | ;)

Carl

Re: dll project does not produce library (.lib)

John R. Shaw25-Nov-04 7:04

John R. Shaw

25-Nov-04 7:04

Well what do you know a self answering post.
Cool | :cool:

Very cool! We learn from those too!

INTP
"The more help VB provides VB programmers, the more miserable your life as a C++ programmer becomes."
Andrew W. Troelsen

Icons in a treelist

Anonymous25-Nov-04 6:19

Anonymous

25-Nov-04 6:19

I have a treelist which I want to add some icons to. I am confused by this but I have seen some code which uses a width of 19 and height of 13 for its icons. The icons I want to use are 16x16 and are multi-color. The icon is a file which contains a 256 color image and a 16.8M color image. There are also 24x24, 32x32 and 48x48 sizes.

What do I set the treelist icon size to for the best? Is the standard font what determines what height I should use? I suppose the width depends on the icons I want to use but if I can use a height of 16 I might as well then use a width of 16.

Are there any articles which explain this clearly?

Re: Icons in a treelist

Joel Lucsy25-Nov-04 7:26

Joel Lucsy

25-Nov-04 7:26

I have not seen any articles explaining this. I have been able to use any size icon, and 32bit color. Probably 256px wide is a reasonable limit. The limits are built into the imagelist you use, not the tree control itself.

--
Joel Lucsy

Somebody has been in my situation?

doctorpi25-Nov-04 4:16

doctorpi

25-Nov-04 4:16

Hi guys
I'm using CFiledialog with multiple selection and ,I don't know the reason but when I read the files selected with :
POSITION pos=dlgFile.GetStartPosition()
while (pos!=NULL){
m_strFile=dlgFile.GetNextPathName( pos);
// here I do whatever with the file
}

The first and the last files are exchanged.
The first value of m_strFile is the last selected file and the last one is the first selected.
Somebody knows why this can happen to me?
Thanks in advance
Doc

Re: Somebody has been in my situation?

Maximilien25-Nov-04 5:43

Maximilien

25-Nov-04 5:43

I know, it's one of those "features" ... Hmmm | :|

Maximilien Lincourt
Your Head A Splode - Strong Bad

C++ Question

dmxdmxdmx0525-Nov-04 4:05

dmxdmxdmx05

25-Nov-04 4:05

How do you find the Middle node of a string , without calculating the length of the string?
How would you test it ?
What if the length was “n” ?
How many pointer variables are used?
Is this done recursively ?

Thanks

Re: C++ Question

toxcct25-Nov-04 5:37

toxcct

25-Nov-04 5:37

for the example, i use a CString :

<font color=#0000FF>char</font> ExtractMiddleNode(<font color=#0000FF>const</font> CString& str) {
    <font color=#0000FF>return</font> str[(<font color=#0000FF>int</font>)(str.GetLength() / 2)];
}

i explain.
GetLength() gives the length of str.
GetLength()/2 so gives the middle of the string.
if the string contain 2n characters (where n is an integer), so, GetLength()/2 gives an integer, that is the position of the middle character.
if the string contains 2n+1 characters (with n still an integer), GetLength()/2 gives an integer+0.5. that's why a truncated the result with the (int) cast.

understand ? Smile | :)

TOXCCT >>> GEII power
[VisualCalc]

Re: C++ Question

John R. Shaw25-Nov-04 6:37

John R. Shaw

25-Nov-04 6:37

When did they start calling a character a node?

GetLenghth() returns and interger and is divided by an interger. The result is an interger. Therefor, there is no need for the int cast.

int i = 11/2;
Result: i = 5;
double d = 11/2;
Result: d = 5.0

INTP
"The more help VB provides VB programmers, the more miserable your life as a C++ programmer becomes."
Andrew W. Troelsen

Re: C++ Question

toxcct25-Nov-04 6:41

toxcct

25-Nov-04 6:41

John R. Shaw wrote:
When did they start calling a character a node?

don't know, i just used what dmxdmxdmx... said.

TOXCCT >>> GEII power
[VisualCalc]

Re: C++ Question

dmxdmxdmx0525-Nov-04 7:28

dmxdmxdmx05

25-Nov-04 7:28

I'm not allowed to do a GetLength ...!!!

Anyways, Can I use a binary search Tree?

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