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Who can explain me exactly how to add vertical scroll that works to my dialog window??? 
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What do you mean by 'vertical scrollbar that does not work'?
Tomasz Sowinski -- http://www.shooltz.com.pl
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hi,
I have a SDI application, and I like to load a bmp file,
I got two functions in CView class.. but it just doesn't work.
can anyone see what the problem is..
void CTestEdgeView::OnFileOpen()
{
// TODO: Add your command handler code here
//build a filter to use in the file open dialo
static char BASED_CODE szFilter[] = "Bitmap Files (*.bmp) | *.bmp ||" ;
//Create the File open dialog
CFileDialog m_ldFile(TRUE, ".bmp", m_sBitmap,OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,
szFilter);
//show the file open dialog capture the result
if (m_ldFile.DoModal() == IDOK )
{
Invalidate();
//get the filename selected
m_sBitmap = m_ldFile.GetPathName();
ShowBitmap( m_sBitmap);
}
}
void CTestEdgeView::ShowBitmap(CString file)
{
//check if we have a valid file
if(file !="")
{
HBITMAP hBitmap = (HBITMAP) ::LoadImage(AfxGetInstanceHandle(),
file, IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE | LR_CREATEDIBSECTION);
if (hBitmap)
{
// Delete the current bitmap
if (m_bmpBitmap.DeleteObject())
// If there was a bitmap, detach it
m_bmpBitmap.Detach();
// Attach the currently loaded bitmap to the bitmap object
m_bmpBitmap.Attach(hBitmap);
}
Invalidate(FALSE);
}
}
I appriciate your help.
Ehsan Behboudi
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Ehasan,
It's been ages since I hacked MFC, but I think I can steer you in the right direction.
Your doc class should contain an HBITMAP member. This bitmap will be displayed in your view's OnUpdate() method. Your app's OnFileOpen() handler should free the doc's existing bitmap (if any) and load a new one from the selected file.
Your view's OnUpdate() method should paint the bitmap in the supplied DC. Remember, you don't "display the bitmap". Instead, you "respond to a request - from Windows - to display the bitmap".
Hope this helps.
/ravi
"There is always one more bug..."
http://www.ravib.com
ravib@ravib.com
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I want to do a Install to my program. The default install path have to be the Programs Files Folder and the name of my application (ie. 'C:\PROGRAM FILES\MyApp'). But when i call the function SHGetSpecialFolderLocation with the argument CSIDL_PROGRAM_FILES she didn't workes. There is other way to do it? Note that the use of SHGetFoldLocation cannot be used because some computers with win95 don't have thist function (shfolder.dll and bla bla bla...). Thanks.
Daniel Barcelos
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What do you mean "it doesn't work"? Does it return a failure code? Crash? Format your hard drive? 
Post your code so we can check out what you're doing.
--Mike--
http://home.inreach.com/mdunn/
#include "buffy_sig"
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I have the following code that I'm having problems understanding.
WHO_RU_API int GetNetUserLoginId(char* pBuffer, int nBufferSize)
{
int nCharCount = 0;
WKSTA_USER_INFO_1 UserInfo;
if ( NERR_Success == NetWkstaUserGetInfo(NULL, 1, (LPBYTE*)&UserInfo) )
{
int nCount = WideCharToMultiByte(CP_ACP, NULL, (LPCWSTR)UserInfo.wkui1_username, -1, NULL, NULL, NULL, NULL);
if ( nCount > 0 )
{
char Buffer[32];
int nCountAgain = WideCharToMultiByte(CP_ACP, NULL, (LPCWSTR)UserInfo.wkui1_username, -1, Buffer, nCount, NULL, NULL);
if ( nCountAgain > 0 )
{
nCharCount = strlen(strncpy(pBuffer, Buffer, min(nBufferSize, nCountAgain)));
}
}
}
return ( nCharCount );
}
I have this function inside a DLL and I'm calling it from a console program. Eveuntually it will be a windows app calling it. The part I don't understand, is that following the second call to the WideCharToMultiByte() function, my 'Buffer' contains a string of 8 illogical characters and the 8 characters of my Lan Id. I know I'm missing something important here, but I'm too lost to see the forest for the trees at the moment . Any help would be appreciated. Thanks.
Chris
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try to type as followed...
TCHAR myBuf[256];
wcstombs( myBuf, UserInfo.wkui1_username , 255 );
...
by
by Peng_you
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Does anybody here have any experience utilizing DirectX/DirectShow in order to create capture devices/encoding devices? If so, could you please let me know, I have some questions that I cannot find the answer to and am hoping someone here can help. Thanks in advance.
Roger Printy
Software Engineer
TeraNex
Orlando, FL
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Hi
Can some one tell me, how I can get the HTML-Code of a page, when i use a CHtmlView to show this page.
thank's
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First, use CHtmlView::GetHtmlDocument to get IDispatch interface. Then call QueryInterface to get IHtmlDocument2 interface pointer. Finally, use IHtmlDocument2::toString method.
Tomasz Sowinski -- http://www.shooltz.com.pl
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You can get an idea here
http://www.codeproject.com/useritems/chtmlview_search.asp
Carlos Antollini.
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Hello, the codegurus around the world.;)
In order to get the source code of html on CHtmlView, you can use GetHtmlDocument and IPersistFile.
Since we can get IDispatch from GetHtmlDocument, we use QueryInterface passing IPersistFile's IID.
After this, we can use Save function of IPersistFile to save the source code at the local drive and check it NotePad executed
by ShellExecute. 
Have a nice day!
-Masaaki Onishi-
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Hello,
I just converted an article at the "other" site (http://www.codeguru.com/listview/VirtualListControl.html) from CArray to std:vector. The performance increased 5 times! The only section that I didn't like was the column sorting method. It uses the qsort() function to sort the columns. It seems there would be a more elegant (STL) method of doing this. There is a class defined for a row of data similar to this (shortened for clarity):
class CRowData {
CString col1;
int col2;
}
The qsort function calls the appropriate comparison function to sort on the desired member. It seems like there should be a way to do this using the STL. I would like to expand this example to include sorting on more than two columns as well.
Any ideas?
Thanks,
Derek
Doble Engineering
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Are you also getting 500% performance improvement in Release build?
Tomasz Sowinski -- http://www.shooltz.com.pl
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Actually it's not as high as I thought. I was comparing debug build to debug build. Using the metrics (GetTickCount) the original author already had in the code (approximate tick values):
CArray:
Debug: 2000
Release: 250
STL:
Debug: 600
Release: 90
List Control InsertItem():
Debug: 15000
Release: 12000
STL Improvement:
Debug: ~ 3.3x
Release: ~ 3.3x
These are after a few runs, but there was definitely an improvement. Either was an improvement over the InsertItem method! I know all of these results are completely subjective (compiler settings, computer speed, etc.), but try it yourself to see the difference!
Also, any ideas on converting the sorting to STL?
Thanks,
Derek
DP
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The speed increase you're experiencing is caused by smaller number of memory reallocations when you add items to your array/vector. CArray grows by constant number of elements, while std::vector (version shipped with VC++) doubles its buffer size when it needs to grow.
Access time to array/vector elements should be identical in Release build - it's *very* simple container; compiler should generate almost identical code. In Debug build, the story is different: STL implementation that ships with VC++ DOES NOT check indices in vector::operator[]. If you're a former CArray user, this may come as total suprise - you can v.resize(10) your vector and use v[100] without assert. In other words, in Debug CArray will be slower, but safer.
The freely available STLPort (www.stlport.org) performs index overflow checking in debug build - I strongly recommend this version of STL.
Tomasz Sowinski -- http://www.shooltz.com.pl
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take a look at std::sort
-c
------------------------------
Smaller Animals Software, Inc.
http://www.smalleranimals.com
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I thought about this, but I'm not sure how to approach it. If I have a class:
class CRowData {
CString col1;
int col2;
}
and I defined a vector as:
std::vector<crowdata> vecRowData;
and I want to use std::sort, then I have to override the operator< and operator==. This means I can only sort on one variable in the operator< method. How can I specify which variable to sort on?
DP
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Use std::sort that takes three arguments. The last one is a predicate - you can pass one predicate when you need to sort by col1, another for col2.
Since it seems that performance is important to you, note that while qsort just shuffles bits around during sorting, std::sort will perform assignments. Depending on members of your struct, it may have impact on perf. Post some results when you're done with this 
Tomasz Sowinski -- http://www.shooltz.com.pl
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there are many flavors of std::sort. some of them take what's called a 'predicate'. this is essentially a custom comparison function. so, you can sort on anything you like.
bool predicateFunction(const CMyStruct& a, const CMyStruct& b)
{
return (a is somehow less than b);
}
vector <CMyStruct> vec;
...
std::sort(vec.begin(), vec.end(), predicateFunction);
so, you just use different predicate functions when you want to sort in different ways (differnet members, direction, etc.)
-c
------------------------------
Smaller Animals Software, Inc.
http://www.smalleranimals.com
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Thank you for the code snippet! It was just what I needed! I created two sort functions:
bool sortCol1(const CLabelItem& a, const CLabelItem& b)
{
return (a.m_strText < b.m_strText); // CString
}
bool sortCol2(const CLabelItem& a, const CLabelItem& b)
{
return (a.m_Addr < b.m_Addr); // DWORD
}
and did the sort comparision only on the STL modified code. Here are the results (in ticks) for 50000 rows:
Debug Release
qsort:
CString 55000 22000
DWORD 220 50
STL sort:
CString 1221 420
DWORD 750 220
Summary ( IMHO )
Use STL for code simplicity and maintenance and use STL sort unless the extra 150 ticks for DWORDs are important!
My thanks to all for all the help!
Derek
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So the qsort is *much* slower for CString sorting? It's rather counter-intuitive, but still possible. Could you post your function that qsort calls back?
Tomasz Sowinski -- http://www.shooltz.com.pl
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Well,... I "screwed up" again I guess I was comparing apples and oranges. The qsort method used the strcmp (C-runtime) function to compare strings. I used CString's operator> method to compare. Both give the same answer, but the CString was much faster. I didn't bother replacing the STL sort code with the strcmp code, because I'm sure it would be slower than qsort's.
Sorry for the misleading results!
Derek
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Hello,
I just converted an article at the "other" site (http://www.codeguru.com/listview/VirtualListControl.html) from CArray to std:vector. The performance increased 5 times! The only section that I didn't like was the column sorting method. It uses the qsort() function to sort the columns. It seems there would be a more elegant (STL) method of doing this. There is a class defined for a row of data similar to this (shortened for clarity):
class CRowData {
CString col1;
int col2;
}
The qsort function calls the appropriate comparison function to sort on the desired member. It seems like there should be a way to do this using the STL. I would like to expand this example to include sorting on more than two columns as well.
Any ideas?
Thanks,
Derek
Doble Engineering
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|
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