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This error happens when you tried to take the address of a member function without qualifying the member function with its class name and the address-of operator.
Can you show the callback function declaration?
- NS -
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OK.
void CALLBACK WaveInCallback(HWAVEIN hw, UINT uMsg,
DWORD_PTR dwInstance, DWORD_PTR dwParam1, DWORD dwParam2)
{
waveInAddBuffer(hw, (WAVEHDR*)dwParam1, sizeof(WAVEHDR));
}
I create it in the From.h.
But I don't know where to allocate it.
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Isn't it a static function? AFAIK it should be static function.
Also I found a mismatch with the documentation in MSDN. See...
void CALLBACK waveInProc(
HWAVEIN hwi,
UINT uMsg,
DWORD dwInstance,
DWORD dwParam1,
DWORD dwParam2
);
You are using DWORD_PTR instead of DWORD. But I am not sure about this 
- NS -
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Appreciate for ur reply.
But it's still same.
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Try to cast like
waveInOpen(&hWav,0, &wfx,(DWORD_PTR)WaveInCallback ,0, CALLBACK_FUNCTION);
- NS -
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It comes other errors.@@
1.error C3374: can't take address of 'p2p::Form1::WaveInCallback' unless creating delegate instance
2.error C2440: 'type cast' : cannot convert from 'void (__clrcall p2p::Form1::* )(HWAVEIN,UINT,DWORD_PTR,DWORD_PTR,DWORD)' to 'DWORD_PTR'
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Please show me the declaration of the callback function. Not in the cpp but inside the class in header file.
- NS -
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NS17 wrote: Please show me the declaration of the callback function.
It's declared in mmsystem.h:
void CALLBACK waveInProc(
HWAVEIN hwi,
UINT uMsg,
DWORD dwInstance,
DWORD dwParam1,
DWORD dwParam2
);
"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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DavidCrow wrote: It's declared in mmsystem.h:
I meant how he declared the the function to use as callback.
- NS -
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public ref class Form1 : public System::Windows::Forms::Form
{
public:
Form1(void)
{
InitializeComponent();
//
//TODO: Add the constructor code here
//
}
int call_id;
void CALLBACK WaveInCallback(HWAVEIN hw, UINT uMsg,DWORD_PTR dwInstance, DWORD_PTR dwParam1, DWORD dwParam2)
{
WAVEHDR* curhdr = (WAVEHDR*)dwParam1;
waveInAddBuffer(hw, curhdr, sizeof(WAVEHDR));
}
............
I put in the class form1
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minihotto wrote: public ref class Form1 : public System::Windows::Forms::Form
You very certainly wanted to ask that in the "Managed C++"-Forum?!?
Let's think the unthinkable, let's do the undoable, let's prepare to grapple with the ineffable itself, and see if we may not eff it after all.
Douglas Adams, "Dirk Gently's Holistic Detective Agency"
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I agree ask on the correct forum.
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I am not sure about this coding.
In C++, it should be static declaration. Try to make it static function.
- NS -
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Hi All,,
I am using MFC Application with VS 2005.
In my application I am capturing the current screen by creating virtual window(by CreateWindow()) and apply hooks to that Window. In hooks I take the perticuler region which is going to be updated and convert it into the rectangle and send these messages to the my application. In My MFC class I store these all rectangles into the list.
And I retrived these list and capture from screen (using bitmap)with that perticular rectangle and compress that rectangle using JPEG.
Here I used Hooks as DLL in other project in my current workspace, so it gives me continues messages with that rectangles.
So , How can I set thread ( or Critical section or mutex) in my application and plz suggest me where i have to create Thread or on which method or class.
I am very sorry for very large description but it is good to understand.
Thanks in Advance.
Ashish Bhatt
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Do you really have to use a thread? (Multitasking should be avoided at all costs, in my opinion)
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ashishbhatt wrote: but it is good to understand.
Yes it is. Therefore it would be good for you to understand threads and threading issues before you develop a multi-threading application yes?
There are sources on the internet you can use, try google, I also recommend the book Advanced Windows by Richter.
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Hi All,
I am writing a Win32 application to retrieve the information of all drivers on the user’s system. To do the same, following steps are used:-
1. SC_HANDLE hSCManager = OpenSCManager()
2. use the hSCManager to enumerate drivers using EnumServicesStatusExW( ) as follows
ENUM_SERVICE_STATUS_PROCESSW* pBuf ;
EnumServicesStatusExW( hSCManager, SC_ENUM_PROCESS_INFO, SERVICE_DRIVER, SERVICE_STATE_ALL, pBuf , dwBytesNeeded, &dwBytesNeeded, &dwTotalDrivers, &dwResumeHandle, NULL ) ;
3. I get service name using pServiceStatusProcess[i].lpServiceName
Now I need to retrieve further information of the driver for which I follow following steps
4. SC_HANDLE hService = OpenServiceW( hSCManager, wstrDriverName.c_str(), SC_MANAGER_ALL_ACCESS )
5. QueryServiceConfigW( hService, lpQueryServiceConfig, dwNeeded, &dwNeeded )
I get fully qualified path name of driver file name using lpQueryServiceConfig->lpBinaryPathName
My problem is, I am not able to get path name for all drivers. Dont know why? I am getting blank file name for following drivers
Abiosdsk, abp480n5, ACPIEC, adpu160m, Aha154x, aic78u2, aic78xx, AliIde, amsint, asc, asc3350p, asc3550, Atdisk, Beep, cbidf2k, cd20xrnt, Cdaudio, Cdfs, Changer, CmdIde
I need fully qualified filename of the driver to retrieve information like creation time, version information of the respective driver files.
Please let me know if there is any way to get the desired information.
Thanks in advance
Manish c
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manish_c wrote: My problem is, I am not able to get path name for all drivers. Dont know why? I am getting blank file name for following drivers
Abiosdsk, abp480n5, ACPIEC, adpu160m, Aha154x, aic78u2, aic78xx, AliIde, amsint, asc, asc3350p, asc3550, Atdisk, Beep, cbidf2k, cd20xrnt, Cdaudio, Cdfs, Changer, CmdIde
Peeking into the registry reveals that those particular entries do not contain a path name. If it isn't there, the SCM can't give you one. It is working correctly and telling you that there isn't a binary name.
Judy
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My problem is this:
I use SetSel() and SendMessage(EM_SETCHARFORMAT, ...) to highlight stuff in the control, and it works fine when using SetWindowText() to set the contents of the control. However, when I use streaming for setting the contents, and if the selection to highlight starts at the first character position (CHARRANGE.cpMin = 0), the highlighting is applied to the entire contents of the control. Moreover, the formatting remains when I fill the control with new text, even if I don't highlight anything in the new text.
Reproducable with:
<br />
int nTransfer;<br />
<br />
nTransfer = _tcslen(m_pchStreamBuf);<br />
if(nTransfer > cb)<br />
nTransfer = cb;<br />
memmove(pbBuff, m_pchStreamBuf, nTransfer);<br />
*pcb = nTransfer;<br />
m_pchStreamBuf += nTransfer;<br />
return 0;<br />
<br />
CHARFORMAT2 cf;<br />
memset(&cf, 0, sizeof(cf));<br />
cf.cbSize = sizeof(cf);<br />
cf.dwMask = CFM_COLOR | CFM_BACKCOLOR;<br />
cf.crTextColor = RGB(0x00, 0, 0);<br />
cf.crBackColor = RGB(0x00, 0xff, 0xff);<br />
m_ctrl.SetSel(0, 3);<br />
m_ctrl.SendMessage(EM_SETCHARFORMAT, SCF_SELECTION, (LPARAM)&cf);<br />
Anyone?
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Hi All,
I am writing a Win32 application to retrieve the information of all process running on the user’s system. To do the same following steps are used:-
Create the process handle Using Win32 API OpenProcess(,,), on passing process id as a parameter
Handle returned by OpenProcess(,,) is further used to retrieve the other information of the process like process name, associated modules etc.
OpenProcess API fails to create the handle for process id 0(system idle process) and 4 (system). API always returns NULL for process id 0 and 4 and hence I am not able to retrieve the associated information.
dwPID = 0 ;//or 4
HANDLE hProcess = OpenProcess( PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, false, dwPID ) ;
if ( NULL != hProcess )
{
if ( EnumProcessModules(hProcess, &hModule, sizeof(hModule), &dwTotalModulesSize) )
}
else
{
cout<< “Unable to open handle “<<endl ;
}
Please let me know if there any way to get desired information for pid 0 and 4.
Thanks in advance
Manish c
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manish_c wrote: Create the process handle Using Win32 API OpenProcess(,,), on passing process id as a parameter
Handle returned by OpenProcess(,,) is further used to retrieve the other information of the process like process name, associated modules etc
actually they are system process, they keep track of system idle time, so mightbe that will reason you mightn't be getting the handle to the process!
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
Never mind - my own stupidity is the source of every "problem" - Mixture
cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
Support CRY- Child Relief and You
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manish_c wrote: OpenProcess API fails...
So why aren't you calling GetLastError() to find out why?
"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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hi all vc++ masters
please tell me how to access c: drive of other system in network from my system
please i need this and please help me
thanks all for their valuable help![Rose | [Rose]](https://www.codeproject.com/script/Forums/Images/rose.gif)
thanks
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p_ wrote: please tell me how to access c: drive of other system in network from my system
\\SYSTEM_NAME\\c$ is of any help!
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
Never mind - my own stupidity is the source of every "problem" - Mixture
cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
Support CRY- Child Relief and You
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ThatsAlok wrote: \\SYSTEM_NAME\\c$
If that works, someone needs to be hit on the head. With a club. Hard and fast. Multiple times. And again. And again. If you or he starts to like it, keep on. He deserves it.
This old security-hole should have been closed for years now...
-- modified at 11:03 Thursday 25th October, 2007
Let's think the unthinkable, let's do the undoable, let's prepare to grapple with the ineffable itself, and see if we may not eff it after all.
Douglas Adams, "Dirk Gently's Holistic Detective Agency"
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