C / C++ / MFC Discussion Boards

suendisra9-Apr-09 5:54

9-Apr-09 5:54

The code I'm writing is designed to read into a Smart Card Reader. However, I've having a most difficult time trying to just setup the connection and get the filename so I can use CreateFile.

I've looked at the MSDN Library and done countless searches on the topic and have seen various things. Some people allocate the SP_DEVICE_INTERFACE_DETAIL_DATA struct, and claim it works, and some don't and they also claim it works (Both of which do not work for me).

The current way my code is set up right now pulls the required size, but when it goes to fill in the struct, the program freezes. Quite frustrating, really.

So here's my question: What must I do to the struct prior to attempting to fill it in with SetupDiGetDeviceInterfaceDetail in order to pull up *->DevicePath ??

Here's the code:

....

//declarations
int n=0, result;
char af[80]="";
bool found=FALSE;
GUID SCRGuId;
DWORD requiredsize=0;
HDEVINFO hDevInfo=NULL;
SP_DEVICE_INTERFACE_DATA DeviceInfoData;
PSP_DEVICE_INTERFACE_DETAIL_DATA DevDetailInfoData;

....

do
{
if(SetupDiEnumDeviceInterfaces(hDevInfo, NULL, &SCRGuId, n, &DeviceInfoData))
{
found = TRUE; requiredsize = 0;
SetupDiGetDeviceInterfaceDetail(hDevInfo,&DeviceInfoData,NULL,0,&requiredsize,NULL);
sprintf(af, "reqsize: %d", requiredsize);
SendDlgItemMessage(hWnd, IDC_ACTIONLIST, LB_ADDSTRING, 0, (LPARAM)(LPCSTR)af);

if(requiredsize != 0)
{
//this is the problem code...can anybody help me here?
DevDetailInfoData->cbSize = sizeof(SP_DEVICE_INTERFACE_DATA);
SetupDiGetDeviceInterfaceDetail(hDevInfo,&DeviceInfoData, DevDetailInfoData,requiredsize,0,NULL);

sprintf(af, "device path %s", DevDetailInfoData->;DevicePath);
SendDlgItemMessage(hWnd, IDC_ACTIONLIST, LB_ADDSTRING, 0, (LPARAM)(LPCSTR)af);
}else{

....

Re: SetupDiGetDeviceInterfaceDetail help

Jerry Evans9-Apr-09 6:32

Jerry Evans

9-Apr-09 6:32

I use this approach when querying audio devices using the ANSI API's ...

<pre>

// Get details for the device registered in this class
DWORD size = sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA) + MAX_PATH * sizeof(WCHAR);
// use vector so it will clean up afterwards
std::vector<BYTE> buffer(size,0);
// set up the pointer
SP_DEVICE_INTERFACE_DETAIL_DATA* pDevInterfaceDetails =
reinterpret_cast<SP_DEVICE_INTERFACE_DETAIL_DATA*>(&buffer[0]);
// let SetupDi know how big a buffer we have ...
pDevInterfaceDetails->cbSize = sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA);
// get the device path ...
if (!SetupDiGetDeviceInterfaceDetail(hDevInfo,&DID,pDevInterfaceDetails,size,NULL,&DevInfoData))
{
continue;
}

Apologies for CP formatting ...

Jerry

Re: SetupDiGetDeviceInterfaceDetail help

suendisra9-Apr-09 19:04

suendisra

9-Apr-09 19:04

Thank you thank you thank you! Jerry, despite the CP formatting, you just helped me solve my problem! Thanks!

cmd.exe error

Max++9-Apr-09 5:49

Max++

9-Apr-09 5:49

"Error spawning 'cmd.exe'"

I always got this error when I build my project (using VS2005).
Please help me to solve this problem.

Re: cmd.exe error

David Crow9-Apr-09 6:33

David Crow

9-Apr-09 6:33

Max++ wrote:
Please help me to solve this problem.

Start here.

"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

Breakpoints not being hit

Like2Byte9-Apr-09 4:44

Like2Byte

9-Apr-09 4:44

Hi, I've set breakpoints in my application. Last night my breakpoints were being hit ok. This morning none of the breakpoints that are set are being hit. So I deleted the project's NCB file. Spurious results at best. I deleted the NCB file again, restarted, cleaned project then rebuilt and my breakpoints are being hit again. Yeah.

However, if I set new breakpoints those breakpoints are missed/skipped.

WTH?

Signed,

Perplexium ad infinitum

Re: Breakpoints not being hit

Rajesh R Subramanian9-Apr-09 5:16

Rajesh R Subramanian

9-Apr-09 5:16

Are you sure you are running a debug build?

It is a crappy thing, but it's life -^ Carlo Pallini

Re: Breakpoints not being hit

Iain Clarke, Warrior Programmer9-Apr-09 5:41

Iain Clarke, Warrior Programmer

9-Apr-09 5:41

In VC6 at least, breakpoints are stored in the .opt file. .ncb is a pest that gets corrupted regularly by intellisense!

Iain.

In the process of moving to Sweden for love (awwww).
If you're in Scandinavia and want an MVP on the payroll (or happy with a remote worker), give me a job!

Re: Breakpoints not being hit

Like2Byte9-Apr-09 9:32

Like2Byte

9-Apr-09 9:32

Didn't know the OPT was used for that! Thank you!! :P

I was able to get it to work - after I deleted all my breakpoints. I'll now next what to do ahead of schedule.

Cheers!! Big Grin | :-D

how to control Stepper Motor Control drive through serial Port

sahih9-Apr-09 4:38

sahih

9-Apr-09 4:38

how to control Stepper Motor Control drive through serial Port member

hi, nice to meet you good people down there. i am a novice programmer, i will be very grateful if you could help me please

how can i control Stepper Motor Control drive through serial Port instead of parallel port by using language such as c/c++

My kindest regards

Sahih

Re: how to control Stepper Motor Control drive through serial Port

Stuart Dootson9-Apr-09 4:43

Stuart Dootson

9-Apr-09 4:43

sahih wrote:
how can i control Stepper Motor Control drive through serial Port instead of parallel port by using language such as c/c++

All depends how the serial port interfaces with the stepper motor compared to the parallel port (do PCs still come with those?).

Here's a good place to start with serial port programming[^], anyway.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: how to control Stepper Motor Control drive through serial Port

CPallini9-Apr-09 5:34

CPallini

9-Apr-09 5:34

Does your stepper motor driver support serial port communication?
If the answer is yes then check out the relative documentation to understand what your application should do. PC side serial communication is a well-trodden path and you will find tons of tutorial, samples, etc...
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Drawin into window outside of CView::OnDraw function

Gastello9-Apr-09 4:29

Gastello

9-Apr-09 4:29

I am drawing using OpenGL and GDI on top of a picture which were drawn before in CView::OnDraw function.
First 2-3 seconds it draws sucessfully, and then cursor of mouse become "clock"( meanth beasy )
and on the screen is nothing drowning. Also the same problem apear during drawing of progress bar, after some time
it become grey and squares of progress bar isn't drawn.

What?

led mike9-Apr-09 4:36

led mike

9-Apr-09 4:36

I don't know what "meanth beasy" means.

Gastello wrote:
on the screen is nothing drowning

Is stuff supposed to be drowning?

Gastello wrote:
it become grey and squares of progress bar isn't drawn.

Well you didn't ask any questions but given what you did say it sounds like you should consider getting some good material (books or internet tutorials) designed to teach beginners how Windows Device Contexts and Drawing/Painting works.

good luck

Re: What?

Stuart Dootson9-Apr-09 4:41

Stuart Dootson

9-Apr-09 4:41

led mike wrote:
I don't know what "meanth beasy" means.

My gibberish translator suggests 'means busy'? I've never seen a keyboard with a lisp before now, though...well, apart from this one[^].

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: What?

Gastello9-Apr-09 5:16

Gastello

9-Apr-09 5:16

Sory for my English

"means beasy" means "sand-glass" cursor appear

I am not amateur, and I don't have time to learn in detail how Windows Device Contexts works. I did not put any question because I explained the problem, and usualy peoble understand it that I need help to solve the problem.

Re: What?

CPallini9-Apr-09 5:22

CPallini

9-Apr-09 5:22

Gastello wrote:
I am not amateur, and I don't have time to learn in detail how Windows Device Contexts works.

This is a sad, sad thing. Source of pain also.
Smile | :)

Re: What?

led mike9-Apr-09 8:26

led mike

9-Apr-09 8:26

Gastello wrote:
I am not amateur, and I don't have time to learn in detail how Windows Device Contexts works.

Ok, then are you aware that you just contradicted yourself in one sentence?

Re: What?

Gastello13-Apr-09 20:58

Gastello

13-Apr-09 20:58

Did you understand my problem? Do you know how Windows Device Contexts works?

Re: What?

Gastello13-Apr-09 22:26

Gastello

13-Apr-09 22:26

I have limited time on fixing bugs and implementation any tasks. I usualy sleep at nights.

cannot convert parameter 4 from 'wchar_t *' to 'char []'

PankajB9-Apr-09 4:05

PankajB

9-Apr-09 4:05

Hi There.

I am using VS2008, and am facing above problem.

Just FYI, I am calling WmCpyDta_GetMessage_sTagData() function as below...

WmCpyDta_GetMessage_sTagData(NULL, NULL, lParam, strTag.GetBuffer(0), strData.GetBuffer(0));

Signature of above function is...

BOOL WmCpyDta_GetMessage_sTagData(HWND hAcceptFrom, HWND hIdOfSender, const LPARAM lMsgStructure, 
		 char szTag[], char szData[]);

Please suggest.

Thanks
PanB

Re: cannot convert parameter 4 from 'wchar_t *' to 'char []'

led mike9-Apr-09 4:30

led mike

9-Apr-09 4:30

wchar_t is not equal to char, hopefully you know that. If you don't nothing I say here is going to help you. So the next thing you do is this[^]

Re: cannot convert parameter 4 from 'wchar_t *' to 'char []'

Stuart Dootson9-Apr-09 4:34

Stuart Dootson

9-Apr-09 4:34

The obvious implication of the error message is that strTag is a wide string (I suspect strData will be as well).

You'll probably be wanting to look at a function to convert wide strings to ASCII ones[^]...

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: cannot convert parameter 4 from 'wchar_t *' to 'char []'

PankajB9-Apr-09 4:44

PankajB

9-Apr-09 4:44

Simply Great !!! Thanks Buddy.

Re: cannot convert parameter 4 from 'wchar_t *' to 'char []'

CPallini9-Apr-09 5:38

CPallini

9-Apr-09 5:38

You should really avoid pickpockets and CString::GetBuffer (unless, for the latter, you've a special licence from Mark Salsbery).
Big Grin | :-D

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