C / C++ / MFC Discussion Boards

Ashok Dahal8-Apr-05 0:24

8-Apr-05 0:24

I am having trouble while handling the keybord control in my project. Can anyone suggest me, how to handle Keyboard control. I want to display two images in a static control and handle them using keyboard.

Ashoka

Re: Keyboard control

ThatsAlok8-Apr-05 18:26

ThatsAlok

8-Apr-05 18:26

Handle [WM_KEYDOWN] in your application

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Alok Gupta
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fisheye lens image to rectilinear conversion

sanjay0078-Apr-05 0:16

sanjay007

8-Apr-05 0:16

i am a newbie in this field..
does anyone know how to convert a fisheye lens image to rectilinear image using openCV or in visual c++.... any algorithms u know or any other information can be of immense help to me
thanks...

sanjay

Re: fisheye lens image to rectilinear conversion

C^hris L^osinger8-Apr-05 7:02

C^hris L^osinger

8-Apr-05 7:02

do you know the transformation used to produce the original "fisheye" image ?

Image Toolkits | Image Processing | Cleek

Re: fisheye lens image to rectilinear conversion

markkuk8-Apr-05 13:16

markkuk

8-Apr-05 13:16

If it's a true fisheye with 180 degree FOV, conversion to rectilinear would result in an infinite image. If you want to convert a segment cropped from the fisheye image, first you need to know the projection used by the lens. Equisolid angle and equidistant projections are the most common. You can get the projection equations from http://www.root.or.jp/fit/pages/gyogan_eng.htm[^] or http://www.lce.hut.fi/~jkannala/Kannala_Brandt_ICPR2004.pdf[^]. Then reverse the fisheye projection and apply the normal perspective projection instead.

Structure declaration

Anonymous7-Apr-05 23:23

Anonymous

7-Apr-05 23:23

I'm wondering what's the usage of the following "tagHELLODATA". Is it for reference inside structure declaration? Can anybody gives me a example?
Thanks

typedef struct tagHELLODATA
{
UINT iColor ;
COLORREF clrText ;
}
HELLODATA, * PHELLODATA ;

Re: Structure declaration

Rajan_ee7-Apr-05 23:38

Rajan_ee

7-Apr-05 23:38

Hi,
That is nothing but a tag/name of the class.Here

HELLODATA data; //creating object-data of type: struct tagHELLODATA

if we refer the structure via typedef struct pointer:
PHELLODATA ptrToHD; //struct tagHELLODATA* ptrToHD

-Rajan

Re: Structure declaration

S. Senthil Kumar7-Apr-05 23:42

S. Senthil Kumar

7-Apr-05 23:42

That's the actual name of the structure. You can skip that in the declaration, IIRC. One place where you need it is if you need a reference to the struct from within the struct itself (for eg, a Node in a list).

typedef struct tagNode
{
   struct tagNode *next; //Can't use Node here.
}Node;

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

Re: Structure declaration

Joel Holdsworth7-Apr-05 23:43

Joel Holdsworth

7-Apr-05 23:43

AFAIK, the tagHELLODATA is not strictly necessary here. In this case, declaring a variable

HELLODATA foo;

has the same effect as declaring it like so:

struct tagHELLODATA foo;

. I believe you can dispense with the tagHELLODATA, changing the declaration to

typedef struct
{
UINT iColor;
COLORREF clrText;
}
HELLODATA, * PHELLODATA;

should not cause any adverse effects.

Joel Holdsworth

Wanna give me a job this summer?
Check out my online CV and project history[^]

Re: Structure declaration

Tim Smith8-Apr-05 4:21

Tim Smith

8-Apr-05 4:21

The best way to explain is by example:

Lets say I want to have a structure called BOB that I want to use in both C and C++.

In C++, I can do the following:

struct BOB { int a };

and then to use BOB I just say:

BOB myVariable;

In C, if I do the following:

struct BOB { int a };

I have to say:

struct BOB myVariable;

So, in order declare a variable in C like you would in C++, people did the following:

typedef struct tagBOB { int a } BOB;

Now in C you can do "BOB myVariable".

Since windows h files are for both C and C++, you still see the "tag" stuff for C which doesn't hurt C++.

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

Problem with MFC DLL and mixed VS-Versions

AnTri7-Apr-05 22:47

AnTri

7-Apr-05 22:47

Hello,
I writes a MFC application with VS 2003. A part of application uses a MFC-extended DLL.
This DLL was written with VisualStudio 6.x. Now I have a silly problem that when I debug my application (with the debug-version DLL), the debugger fails when I access the the DLL. If I compile the DLL with VS 2003 everything works well.
Does it make a difference with which version of VS the DLL is compiled?
Applies this problem only to Mfc dlls?

many thanks...

Re: Problem with MFC DLL and mixed VS-Versions

ThatsAlok7-Apr-05 23:22

ThatsAlok

7-Apr-05 23:22

Actually MFC Extention Dll made from VS 6.0 linked with MFC42.dll and application made with VS 2003 linked with MFC71.dll.

this might be causing confliction!

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Assign ODBC Recordset to an object

rajan_hp7-Apr-05 21:21

rajan_hp

7-Apr-05 21:21

Hi all!

I am developing an application using MSMQ and i want to send a recordset object using it. now my problem is how can i fetch all records in an recordset object. I have using ODBC and my database server is Microsoft SQL . Whenever I open recordset, i want that whole recordset will assign to an object.

Is there any way I can ensure that all records from a record set will assign to an object ?

Any help would be greatly appreciated!

Thanks,

Rajan

Re: Assign ODBC Recordset to an object

David Crow8-Apr-05 5:12

David Crow

8-Apr-05 5:12

A CRecordset object does not contain the record set itself. It simply provides you with methods for accessing it. Use the MoveNext() method to iterate through each record of the set, and add each record to a list/array of some sort.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

MFC System Information

charu1237-Apr-05 20:35

charu123

7-Apr-05 20:35

hi,

Could someone Please tell me how to retrieve the following information to print in the dialog box.

Ethernet:

NIC Address:

IP Address:

Modems installed:

Browser Information:

Version:

Start page:

Viewing Security:

NetClient:

Network Protocols:

III. DIRECTORIES
Temp Directory:

IV. DISK INFORMATION

Drive C: Fixed Disk

Volume Name:

Volume Serial:

Total Space:

Free Space:

V. DISPLAY

Display Adapter:

Display Resolution:

Display Colors:

thanks

U get wht u Give

Re: MFC System Information

ThatsAlok7-Apr-05 22:26

ThatsAlok

7-Apr-05 22:26

charu123 wrote:
hi,
Could someone Please tell me how to retrieve the following information to print in the dialog box.

III. DIRECTORIES

Windows Directory: [GetWindowsDirectory]
System Directory: [GetSystemDirectory]
Temp Directory: [GetTempPath]

IV. DISK INFORMATION
Drive C: [::GetLogicalDrives]
Fixed Disk [GetDriveType]
Volume Name/Volume Serial: [GetVolumeInformation]

Total Space/Free Space:: [GetDiskFreeSpaceEx]

V. DISPLAY
Display Adapter/Display Resolution/Display Colors: [SystemParametersInfo]
VI. MEMORY
Total Physical RAM/Free Physical RAM/Total Page File
Free Page File/Total Virtual Memory: [GlobalMemoryStatus[Ex]]

I amn't able to find api for rest! may be somebody else with help! Sigh | :sigh:

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Re: MFC System Information

charu1238-Apr-05 2:47

charu123

8-Apr-05 2:47

Thanks for the info.

I am having a little probs figuring out how to use SystemParametersInfo.

I also need help with:

DEFAULT PRINTER:

ServerName:

PrinterName:

ShareName:

PortName:

DriverName:

Description:

Location:

Processor:

Processor param:

DataType:

Status:

Current jobs: 0

Current printing speed:

Print to the following port:

thanks

U get wht u Give

Re: MFC System Information

P-Rex8-Apr-05 3:55

P-Rex

8-Apr-05 3:55

Try this, you should get Devicename, port and the drivername of your default printer

CPrintDialog dlg(FALSE);

if (!dlg.GetDefaults())
AfxMessageBox(_T("You have no default printer!"));
else
{
CString strDescription;

strDescription.Format(_T("Your default printer is %s on %s using %s."),
(LPCTSTR) dlg.GetDeviceName(),
(LPCTSTR) dlg.GetPortName(),
(LPCTSTR) dlg.GetDriverName());

AfxMessageBox(strDescription);
}

P-Man

Re: MFC System Information

David Crow11-Apr-05 2:52

David Crow

11-Apr-05 2:52

Have a look at:

<br />
IPrintCorePS2::GetOptions()<br />
EnumJobs()<br />
GetPrinter()<br />
GetPrinterData()<br />
etc<br />

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Re: MFC System Information

charu12311-Apr-05 3:53

charu123

11-Apr-05 3:53

I am getting an error sayin

The data area passed to a system call is too small.
theSIZE i have declared is 5000.

please tell m ewhr i am going wrong in this code snippet.

char DevName[100];

sprintf(DevName,"%s",(LPCTSTR)dlg.GetDeviceName());
HANDLE phPrinter=NULL;
DWORD dwBytesNeeded;
PRINTER_INFO_2 *pst;
BYTE pPrinter;
DWORD sizeReq=SIZE;
OpenPrinter(DevName,&phPrinter,NULL);

GetPrinter(phPrinter, 2, &pPrinter, sizeReq, &dwBytesNeeded);
pst=(PRINTER_INFO_2 *)malloc(dwBytesNeeded);
char j[SIZE];
sprintf(j,"%l",pst->AveragePPM);

U get wht u Give

Re: MFC System Information

ThatsAlok8-Apr-05 18:25

ThatsAlok

8-Apr-05 18:25

About Printer You already got the answer and about rest you can depend upon this api [GetSystemInfo]

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Re: MFC System Information

David Crow8-Apr-05 5:07

David Crow

8-Apr-05 5:07

charu123 wrote:
NIC Address:
IP Address:

To get the MAC address, use GetAdaptersInfo(). To get the IP address, use gethostname() followed by gethostbyname().

charu123 wrote:
Browser Information:

Since more than one browser can be present, this question cannot be answered directly. One approach would be to call FindExecutable() with the name of some .html file. Then query that executable using GetFileVersionInfo() and VerQueryValue().

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Re: MFC System Information

charu12311-Apr-05 0:07

charu123

11-Apr-05 0:07

Hi I am having some problem...
please see this code and tell me whr I am going wrong.

        LPTSTR lptstrFilename;<br />
	char buffer[BUF]="C:\\Program Files\\Internet Explorer\\iexplore.exe";<br />
        lptstrFilename = (char *) malloc( sizeof(BUF) );<br />
	strcpy(lptstrFilename,buffer);<br />
	DWORD dwHandle=NULL;<br />
	DWORD lpdwHandle= -1;<br />
        DWORD dwLen=0;<br />
	void *lpData;<br />
	<br />
	dwLen= GetFileVersionInfoSize(lptstrFilename,&lpdwHandle);<br />
	lpData = malloc(dwLen);<br />
	DWORD dwError = GetLastError();<br />
	BOOL bRet = GetFileVersionInfo(lptstrFilename,NULL,dwLen,&lpData);<br />
	PUINT lplpBuffer;<br />
        PUINT puLen;<br />
<br />
	VerQueryValue(lpData, <br />
                TEXT("\\VarFileInfo\\Translation"), <br />
                &lpBuffer, <br />
                &dwBytes);<br />

I am getting an error when i reach the VerQueryValue.
Can u please point out the mistake.

U get wht u Give

Re: MFC System Information

David Crow11-Apr-05 2:28

David Crow

11-Apr-05 2:28

charu123 wrote:
char buffer[BUF]="C:\\Program Files\\Internet Explorer\\iexplore.exe";

This will not work if IE has been moved/installed to a different location. Better to use FindExecutable().

Why copy buffer to lptstrFilename? That makes no sense. Confused | :confused:

charu123 wrote:
Can u please point out the mistake.

Not unless you disclose what error you are receiving. Have you searched for examples?

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/resources/versioninformation/versioninformationreference/versioninformationfunctions/verqueryvalue.asp[^]

http://www.mindcracker.com/mindcracker/c_cafe/winapi/version.asp[^]

http://gnuwin32.sourceforge.net/version.c.txt[^]

http://www.google.com/search?num=20&hl=en&lr=&safe=off&c2coff=1&q=verqueryvalue+GetFileVersionInfo&btnG=Search[^]

http://www.codeproject.com/file/fileversioninfo.asp[^]

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Re: MFC System Information

charu12311-Apr-05 0:47

charu123

11-Apr-05 0:47

I am not able to implement GetAdaptersInfo becoz it is not recognizing some header files.
Is there any other way i can implement it.
Probably read from some file etc.

Can u tell me how to get CPU speed.

Thanks

U get wht u Give

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