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That entirely depends on the USB peripheral you're trying to communicate with. For instance, if it's a memory stick or a camera you would use various standard Win32 API calls.
I've just finished designing a custom USB peripheral that uses an off-the-shelf USB interface chip. In this case, the chip's manufacturer (FTDI) provides a DLL and import library with various functions one can call. Almost too easy! 
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I'm always having this error.
{ ASSERT(::IsWindow(m_hWnd)); return (int)::SendMessage(m_hWnd, LB_ADDSTRING, 0, (LPARAM)lpszItem); }
CInfoDlg is derived from CDialog and is a resource
m_cList is a CListCtrl
CInfoDlg dlg;
for(int nIndex=0;nIndex<nMax;nIndex++)
dlg.m_cList.AddString(lpszNames[nIndex]);
ERROR
dlg.DoModal();
I'm overlooking something, but what?
[VISUAL STUDIO 6.0] [MFC] [WIN98/2]
 Bluute tette!
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Sorry, but something's going wrong here 
nIndex is a loop from 0 to nMax containing 1 functioncall
dlg.m_cList.AddString(lpszNames[nIndex]);
It's the functioncall that causes the error
[VISUAL STUDIO 6.0] [MFC] [WIN98/2]
Bluute tette!
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frisco wrote:
It's the functioncall that causes the error
Yes! Read my reply to your first post!
Nish
Regards,
Nish
Native CPian.
Born and brought up on CP.
With the CP blood in him.
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That last post was ment as a correction on the first post. something went wrong with the formatting: lots of characters are lost...
[VISUAL STUDIO 6.0] [MFC] [WIN98/2]
Bluute tette!
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frisco wrote:
I'm overlooking something, but what?
Your dialog is not created yet! The C++ object is created, but the actual window it wraps is not up! That's why you get the assert. Use DoModal() and then put your list populating code in the OnInitDialog() handler
Nish
Regards,
Nish
Native CPian.
Born and brought up on CP.
With the CP blood in him.
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Sorry, but I'm still in the "java" kind of programming 
So, the instantiation is only made when the dialog is show on screen, and not when we call the constructor (like in java)? Am I having this wright?
[VISUAL STUDIO 6.0] [MFC] [WIN98/2]
 Bluute tette!
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frisco wrote:
So, the instantiation is only made when the dialog is show on screen, and not when we call the constructor (like in java)? Am I having this wright?
The object [Here a CDialog derived class] is instantiated alright. But the underlying window is not yet created. MFC classes are really thin wrappers over the API. Till Create or DoModal is called, you should not try making any window manipulating function calls! Or any calls that access child controls in the window.
Nish
Regards,
Nish
Native CPian.
Born and brought up on CP.
With the CP blood in him.
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I have a function that takes the pidl of a folder and loops through all the files in the folder and if there is a folder i the folder it calls itself, else it adds the file to a listview control. This works ok the first time the function is run, but when i calls itself, the pBrowse->EnumObjects doesen't return NOERROR it returns -2147023673, can anyone help me? the pidl i pass in the function is a pidl gotten from the SHBrowseForFolder function, here is the function:
(ignore the text after the pre tag, something went wrong when i modfied the post.
void AddFilesFromFolder(ITEMIDLIST *pIdl)
{
if (pIdl)
{
IShellFolder *pBrowse = NULL;
LPENUMIDLIST pFolder = NULL;
LPMALLOC pMalloc = NULL;
ITEMIDLIST *pNewId = NULL;
STRRET strDispName;
LVITEM lvItem;
RECT rMain;
RECT rAdd;
char szCurrentFile[MAX_PATH+1+5];
char szFolderPath[MAX_PATH+1];
DWORD pActual = 0;
DWORD dwAttrib;
IShellFolder *CurrentFolder;
HRESULT err;
err = SHGetDesktopFolder (&CurrentFolder);
if (err == NOERROR)
{
SHGetMalloc(&pMalloc);
CurrentFolder->BindToObject(pIdl, NULL, IID_IShellFolder, (LPVOID*)&pBrowse);
pBrowse->GetDisplayNameOf(pIdl, SHGDN_INFOLDER, &strDispName);
err = pBrowse->EnumObjects(NULL, SHCONTF_FOLDERS | SHCONTF_NONFOLDERS | SHCONTF_INCLUDEHIDDEN, &pFolder);
if (err == NOERROR)
{
SHGetPathFromIDList(pIdl, szFolderPath);
lvItem.mask = LVIF_IMAGE | LVIF_TEXT;
while (pFolder->Next(1, &pNewId, &pActual) != S_FALSE)
{
dwAttrib = SFGAO_FOLDER;
pBrowse->GetAttributesOf(1, (LPCITEMIDLIST*)&pNewId, &dwAttrib);
if (!(dwAttrib & SFGAO_FOLDER))
{
pBrowse->GetDisplayNameOf(pNewId, SHGDN_INFOLDER, &strDispName);
PathCombine(gszPath, szFolderPath, strDispName.cStr);
GetID3();
FillInfo();
ListAddItem();
}
if (dwAttrib & SFGAO_FOLDER)
{
pBrowse->GetDisplayNameOf(pNewId, SHGDN_INFOLDER, &strDispName);
AddFilesFromFolder(pNewId);
}
}
pMalloc->Free(pNewId);
pMalloc->Release();
EndDialog(hDialog, true);
gbFileOpen = true;
pFolder->Release();
}
CurrentFolder->Release();
}
}
}etDisplayNameOf(pNewId, SHGDN_INFOLDER, &strDispName);
AddFilesFromFolder(pNewId);
}
}
pMalloc->Free(pNewId);
pMalloc->Release();
EndDialog(hDialog, true);
gbFileOpen = true;
pFolder->Release();
}
CurrentFolder->Release();
}
}
}
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redeemer wrote:
Ignore this post something's wrong with it, i'll make another.
LOL
Okay! HTML does weird things I guess 
Nish
Regards,
Nish
Native CPian.
Born and brought up on CP.
With the CP blood in him.
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Yep, something's going wrong here
same for two messages above this: CFileDialog assertion error
[VISUAL STUDIO 6.0] [MFC] [WIN98/2]
Bluute tette!
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You can also modify or delete a post if you are not satisfied with it.
Best regards,
Alexandru Savescu
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i want to know where can registry free homepage account!
i need a free web space (3-10MB)
please introduce me some.... thank you.
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You can find hundreds of free web services, did you look at google.com directory ? 
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tiaozi wrote:
need a free web space (3-10MB)
Try Yahoo-Geocities
Nish
Regards,
Nish
Native CPian.
Born and brought up on CP.
With the CP blood in him.
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www.brinkster.com
Jason Gerard
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thanks for your advice! 
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I read that in MSDN that: "COM+ will not propagate traditional C++ exceptions as extended IErrorInfo information." Does that mean that a COM that uses IErrorInfo information will not be able to pass info to another calling COM+ application?
Should I change the original component to _com_raise_errors?
Spiros Prantalos
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Hello there,
Does anyone out there know how to write a handwritten-like mathematical expression using MFC (just like the one in MAPLE/MATHEMATICA) ?
Thanx a lot.
MARIO ANDRETTI
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Hi too tired to think properly
am working on a project where i get some strings from a remote database but the strings have got stuff like
"Prætorius" which i hafta convert to "Praetorius"...
wots the quick way of using CString to deal with it?
regards and thanks
bryce
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<br />
CString str;<br />
str.Replace(_T("æ"), _T("ae"));<br />
Dylan Kenneally
London, UK
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That looks like the remote strings are UTF-8 encoded. CString class has no direct support for UTF-8 decoding.
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is there an easy way to convert themto their ascii equivalents without using
CString::Replace ?
bryce
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I have a dialog-based MFC application with a static control that covers the entire surface and a smaller WebBrowser control. The problem is: when painting, the WebBrowser control is drawn before the static one and, as a result, becomes not visible.
Do you know how to establish the correct paint order?
rechi
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You can change the Z-Order of the controls.
There is a relation between the Tab order and the Z-Order
but i dont remember if it is same order or reverse.
Just try changing the tab order and see.
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