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Ram Murali wrote: computer hardware programming using VC++.
 
There are hardware related programming aspects such as "firmware" and "device drivers" programming, but none is using Visual C++.
Maxwell Chen
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May i know what are the programming languages used to develop firmware and device drivers??
Regards,
Ram
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Ram Murali wrote: what are the programming languages used to develop firmware and device drivers??
People mainly use "C" or "embedded C" to develop firmware. Maybe some others use assembly.
And "C" for device driver development with Microsoft DDK. Some minority uses "C++" to develop device drivers, but it is not recommended by Microsoft. (Reference.[^])
Maxwell Chen
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thank you very much for spending ur time to make me to learn some basics of firmware and device drivers.
Regards,
Ram
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Hello
I create a view as a camera UI.
When I push the button, the video recording start.
Then I want to show the time of record in the view.
In MFC, what function could be a counter for the foramt of "hr : minute : second"??
And what function could show the time in view??
Thanks a lot!!
Any suggestion is useful!! Thanks!!
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Try this
CTime objTime = CTime::GetCurrentTime(); <br />
CString csTime;<br />
csTime = objTime.Format( "%I:%M:%S" );
Dream bigger... Do bigger...Expect smaller
aji
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You can use this to get the System time.
SYSTEMTIME SysTime = {0};
:GetSystemTime( &SysTime );
rgds
aneesh
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To show the current Time you can use CTIme::GetCurrentTime(...) or other APIs..
If you want to show the recording time, that is, how long the recording is going on.. you can use GetTickCount() as below...
DWORD dwTicks = GetTickCount();
CTimeSpan objTime(dwTicks / 1000);
CString strTime = objTime("%H %M %S");
GetTickCount() returns time in milliseconds, but CTimeSpan required only seconds... so divide the value by 1000 to get number of seconds...
Do your Duty and Don't expect the Result
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Dear,
Would anyone know the reason and meaning of adding a "#" label before the variable "expr"?
# define DEBUG_ASSERT(expr) do { \
if(!( expr )) { \
fprintf(stdout, "%s[%d] ASSECTION Failure [%s]\n",\
__FILE__, __LINE__, #expr) ; \
abort();\
}\
} while(0)
Thx a lot.
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How do I get an individual control to accept WM_DROPFILES? I derived a class from CListBox and added the WM_DROPFILES handler. The control in the dialog resource has AcceptFiles set to true, and I even set:
BOOL CSourceListBox::PreCreateWindow(CREATESTRUCT& cs)
{
cs.dwExStyle |= WS_EX_ACCEPTFILES;
return CListBox::PreCreateWindow(cs);
}
The icon just shows as if drop isn't allowed. Any ideas?
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Nitron wrote: The icon just shows as if drop isn't allowed.
You have to manage the icon yourself. You can use a CImageList. It has a bunch of members dealing with drawing a drag icon (BeginDrag,DragEnter,DragLeave,EndDrag... etc.) You also use mouse events and maybe capture the mouse during a drag operation.
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led mike wrote: Nitron wrote:
The icon just shows as if drop isn't allowed.
You have to manage the icon yourself. You can use a CImageList. It has a bunch of members dealing with drawing a drag icon (BeginDrag,DragEnter,DragLeave,EndDrag... etc.) You also use mouse events and maybe capture the mouse during a drag operation.
um... ok, i guess I wasn't clear on my issue... In the OnDropFiles fcn, I have a statement like: AfxMessageBox("Got Drop!"); the WM_DROPFILES message is never getting processed...
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Hello,
I'm trying to read from the registry a value from a key, but I don't understand some parameters from the reading function.
here is a piece of code:
<br />
CRegKey key;<br />
key.Open(HKEY_LOCAL_MACHINE,"Software\\MyProject\\key");<br />
key.SetStringValue("TRUE","TRUE");<br />
if (key.QueryStringValue(?,?,?)=="TRUE") MessageBox("TRUE");<br />
I dont understand the parameters within the QueryStringValue( )
Can you please explain for me what this parameters do and what values for instance I can set to the parameters?
Another problem:
Every time I execute the program I'm getting an assertation that m_hKey ! = 0
I tried to remove the ASSERT line:
<br />
ATLASSERT(m_hKey != NULL);<br />
but it still stops at the line of this assert and gives me the assertation although I removed it.
why?
and how can I remove it for real?
Thanking you in advance!
-- modified at 15:45 Thursday 27th July, 2006
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Semion_N wrote: CRegKey key;
key.Open(HKEY_LOCAL_MACHINE,"Software\\MyProject\\key");
What is the return value? Open will fail if HKLM\Software\MyProject\key does not exist. Use CRegKey::Create() instead.
Semion_N wrote: Every time I execute the program I'm getting an assertation that m_hKey ! = 0
key.open() is failing, so CRegKey::m_hKey is zero.
Do not remove the ASSERTS, they are used to tell you when you do something wrong.
Semion_N wrote: key.QueryStringValue(?,?,?)
From MSDN:
Parameters
pszValueName
Pointer to a null-terminated string containing the name of the value to query.
pszValue
Pointer to a buffer that receives the string data.
pnChars
The size, in TCHARs, of the buffer pointed to by pszValue. When the method returns, pnChars contains the size, in TCHARs, of the string retrieved, including a terminating null character.
Return Value
If the method succeeds, ERROR_SUCCESS is returned. If the method fails to read a value, it returns a nonzero error code defined in WINERROR.H. If the data referenced is not of type REG_SZ, ERROR_INVALID_DATA is returned. If the method returns ERROR_MORE_DATA, pnChars equals zero, not the required buffer size in bytes.
CRegKey key;
if (ERROR_SUCCESS == key.Create(HKEY_LOCAL_MACHINE, "Software\\MyProject\\key"))
{
if (ERROR_SUCCESS == key.SetStringValue("TRUE_KEY", "TRUE_VALUE"))
{
char readbuffer[30] = {0};
ULONG buffersize = 30;
if (ERROR_SUCCESS == key.QueryStringValue("TRUE_KEY", readbuffer, &buffersize))
{
if (0 == strcmp(readbuffer, "TRUE_VALUE"))
{
MessageBox("TRUE");
}
}
}
}
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Thank you!!!
and another question:
How can I check if the key exist?
SnaidiS(Semion)
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Semion_N wrote: How can I check if the key exist?
Call Open() the way you did in your original post and check the returned error code. If the key does not exist Open() will fail with the return value of ERROR_FILE_NOT_FOUND.
Sorry it took so long to respond, I am not getting any reply emails from CP
You may be right
I may be crazy
-- Billy Joel --
Within you lies the power for good, use it!!!
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pParams->add(amountId, (char *)&changeAmount, sizeof(changeAmount));
the second parameter looks strange...... haven't dealt with those before....
What's the function of that? [ (char *)&changeAmount ]
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reinterpret_cast()
int x = 0
// 4 bytes on 32-bit
char *p = reinterpret_cast<char *="">(&x)
Kuphryn
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im lost....... not to mention imma beginner
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Actualy I knew one gentelman who casted CString* to CDocument* using reinterpret_cast. Great!
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what is type of changeAmount?
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its an integer
void ChangeBallVelocity(int changeAmount)
{
RTI::ParameterHandleValuePairSet* pParams = NULL;
pParams = RTI::ParameterSetFactory::create( 1 );
pParams->add(amountId, (char *)&changeAmount, sizeof(changeAmount));
rtiAmb.sendInteraction(velocityId, *pParams, NULL);
delete pParams;
}
This is very confusing....
What is pParams assigning?
class RTI_EXPORT ParameterSetFactory {
public:
static ParameterHandleValuePairSet* create(ULong count)
throw (
MemoryExhausted,
ValueCountExceeded,
HandleValuePairMaximumExceeded);
};
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What's strange about it? The second parameter to the add() method is expected to be a char*. changeAmount is some other type, hence the cast.
"Money talks. When my money starts to talk, I get a bill to shut it up." - Frank
"Judge not by the eye but by the heart." - Native American Proverb
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Dave did you see address of what they are taking and what is going to happen later.
But reinterpret_cast solution was the best
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