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Some thoughts would be to do one of the following:
Figure out why the ScaleViewportExt is not working.
Do double buffer drawing and simply do a StretchBlt rather than a BitBlt when drawing to your scaled device. This approach doesn't always look very good, though.
onwards and upwards...
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How does the WindowExt & ViewportExt work? I know they have no effect on map modes like MM_LOENGLIDS/MM_HIENGLISH/MM_LOMETRIC/MM_HIMETRIC/MM_TWIPS/MM_TEXT. It only has an effect if you are using MM_ISOTROPIC and MM_ANISOTROPIC. By using these you can create a one-to-one relations ship with other units?
Like: The screen is usally 96dpi and I have a device that is 200dpi. I create a bitmap in 200dpi (lengthXwidth), then use these to create a conversion from the 96 -> 200?
Examle:
pDC->SetMapMode( MM_ISOTROPIC );
pDC->SetWindowExt( 96 * 8.5, 96 * 11 ); // or 120 if using large fonts
pDC->SetViewportExt( 200*8.5, 200*11 );
Rect( 96, 96, 192, 192 );
pDC->Rectangle( &Rect )
Would this create a 1" x 1" on the new bitmap?
Thanks
Larry
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Hi,
I am programming with Visual C++ 6.0. My sources files are on an intranet network. Visual C++ is installed locally on my computer. I compile and link over the network.
I plan to put my sources files in my desktop computer and compile locally because I have remark that compiling true the network is slow.
I want to know wich method is using to back up sources files at the end of the day.
Bye,
Claude
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Gagnon Claude wrote:
the network is slow
I know what you mean. Even a 100 TX connection is slow during compiles. I think this is mainy because of permissions but I may be wrong...
I created a batch file to zip my source and copy it to the network folder.
John
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Source control would be the best solution.
onwards and upwards...
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it is possible to fix the size of formview in mdi?
thanx in advance.
Shinya
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i believe that everyone have used mepg player.as we know,the player have several control panel,we can diplay some of them or not,we can seperate the panel from another,also when we move the panel near another,they will be connected automatically. now i want to realize that kind of control.
if anyone can tell me the name of the control or where can i find some source code?
thanks a lot!
gucy
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Hello,
How to change size of a activexcontrol (which is in a dialog) dynamically. How to enable autoscroll of a dialog if size of activexcontrol is bigger than size of dialog.
Thanks,
Chito.
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I define a rich edit box with horizontal and vertical scroll bar.
It works as it is supposed to; however, when I set the option ECO_SAVESEL with SetOption (no matter if OR or SET), the scroll bars don't come up. (SetOption is executed in InitDialog).
Does anyone have an idea, what's wrong or how to circumvent the problem?
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I have the same problem, I'm waiting solution also. 
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add code:
m_richedit.ShowScrollBar(SB_VERT,FALSE);
it will be ok. 
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I used VS.NET 2003 to create a windows installer package but if I try and install the resulting msi package over the top of a previous install it complains with a message "... you must uninstall the previous version first"
Is there any way to allow installing over an existing one? and a related topic is can I set certain files to not be copied to the target if they exist already?
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I have looked at the Modern C++ Design book and since none of the examples work in VC6 world, figured I should come up with something of my own.
So to start with, what do you think about this Singleton implementation?
header file
#include <windows.h>
class CSingleton
{
public:
static CSingleton & GetSingletonInstance ();
static void Guard();
static void UnGuard();
private:
CSingleton();
CSingleton(const CSingleton & );
virtual ~CSingleton();
static CSingleton * m_pSingleton;
static CRITICAL_SECTION m_CriticalSection;
static long m_lGuardCount;
};
cpp file
#include "Singleton.h"
CSingleton * CSingleton::m_pSingleton;
CRITICAL_SECTION CSingleton::m_CriticalSection;
long CSingleton::m_lGuardCount;
CSingleton::CSingleton()
{
}
CSingleton::~CSingleton()
{
}
CSingleton::CSingleton(const CSingleton & )
{
}
CSingleton & CSingleton::GetSingletonInstance()
{
if(!m_pSingleton)
{
Guard();
if(!m_pSingleton)
m_pSingleton = new CSingleton();
UnGuard();
}
return *m_pSingleton;
}
void CSingleton::Guard()
{
EnterCriticalSection(&m_CriticalSection);
m_lGuardCount++;
}
void CSingleton::UnGuard()
{
LeaveCriticalSection(&m_CriticalSection);
m_lGuardCount--;
}
How does this implementation look to you? The GuardCount is just there for reference. Doyou think Critical Section is enough or should I be using Events or Mutexes?
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What does happen if
Anonymous wrote:
m_pSingleton = new CSingleton();
produce an exception?
How do you dispose of m_pSingleton when program ends?
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As for the disposal part, wouldn't be cleaned up automatically as it is a static variable?
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It is usually not very practical (system resources, unwritten files, database connections etc.), and it is extremely annoying during maintenance. I strongly recommend using std::auto_ptr or something similar.
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Hi,
I am extremely new to using MFC, and am programming a simple application with a couple dialog boxes. I created the dialog boxes and the menu items, but I can not figure out how to set one of the radio buttons as the default choice. I was trying to use the CheckRadioButton feature but it doesn't work.
Any help would be appreciated...
Thanks in advance.
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One solution is via resource editor. Look for an option to set the default button. Another solution is to initialize the radio buttons in OnInitDialog(). Call SetCheck().
Kuphryn
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If you don't have a member variable for each of the radio buttons, you can use:
BOOL CMyDialog::OnInitDialog()
{
CheckRadioButton(ID_RADIO1, ID_RADIO5, ID_RADIO2);
}
Otherwise, create a member variable for each of the radio buttons. Then in OnInitDialog(), set the state of each with SetCheck().
BOOL CMyDialog::OnInitDialog()
{
m_btn1.SetCheck(FALSE);
m_btn2.SetCheck(TRUE);
m_btn3.SetCheck(FALSE);
m_btn4.SetCheck(FALSE);
m_btn5.SetCheck(FALSE);
}
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Use ClassWizard to add a member variable tied to the first radio button in the group. The variable will be of type int. In the dialog box class's constructor, you will see that the variable is set to -1. This means that none of the radio buttons are selected. Set this to 0 (for the first radio button in the group), 1 (for the second in the group) etc.
Hope this helps
Ryan
Being little and getting pushed around by big guys all my life I guess I compensate by pushing electrons and holes around. What a bully I am, but I do enjoy making subatomic particles hop at my bidding - Roger Wright (2nd April 2003, The Lounge)
Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late - John Nichol "Point Of Impact"
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Thanks for all the help.
Did the trick....
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I'm having trouble understanding the use of vectors in C++, perhaps someone could comment about this snippet of code (found on the internet). In particular, the area I'm most confused about is in bold below...
How do you add elements to the list without having to assign objects names first? I'm trying to find a way to nest vectors of stuctures. From posts on this board, I've found that CArray is not recommended.
Here's the snippet of code... It's an array of people, each may have a variable number of nickels (dimes and pennies could be added).
************ nickel.h ********************************
#include < list >
#include < vector >
#include < algorithm >
#include < iostream >
using namespace std;
class nickel
{
public:
nickel();
virtual ~nickel();
};
class person
{
public:
person();
virtual ~person();
void addNickel(nickel *n) {myNickels.push_back(n);}
void removeLastNickel() {myNickels.erase(myNickels.end());}
private:
list < nickel * > myNickels;
};
**********KDlg.cpp*******************
void CKDlg::OnNewPerson()
{
//These don't work
NewNickel = new nickel;
NewPerson = new person; //doesn't work
NewPerson.addNickel(NewNickle) //expected constant expression
//This works, but forces me to assign objects to each element of the array...seems to defeat the purpose of a resizable array.
person p1,p2;
nickel n1,n2,n3;
p1.addNickel(&n1);
}
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nickel* nn = new nickel;
person* np = new person;
np->addNickel(nn);
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Hi!
I'm developing on a Win2k platform and I need to use the SP_DRVINFO_DATA to be defined as SP_DRVINFO_DATA_V2 instead of SP_DRVINFO_DATA_V1. As stated in MSDN:
"If your component will be used only on Windows 2000 and later, do not define the identifier. If the identifier is not defined, SP_DRVINFO_DATA_V2 is used."
Here's the define they're talking about: #define USE_SP_DRVINFO_DATA_V1 1
Obviously, I didn't defined this but SP_DRVINFO_DATA is still defined as SP_DRVINFO_DATA_V1.
Then, I went to the setupAPI.h file to see what was going on:
#if USE_SP_DRVINFO_DATA_V1 || (_SETUPAPI_VER < 0x0500)
...
typedef SP_DRVINFO_DATA_V1 SP_DRVINFO_DATA;
#else
***
typedef SP_DRVINFO_DATA_V2 SP_DRVINFO_DATA;
Since I didn't define the first condition, it's obvisous that the _SETUPAPI_VER is < than 0x0500. _SETUPAPI_VER is actually defined as (in my environment)
#if defined(_WIN32_WINNT) && (!defined(_WIN32_WINDOWS) || (_WIN32_WINNT < _WIN32_WINDOWS))
#define _SETUPAPI_VER _WIN32_WINNT // SetupAPI version follows Windows NT version
_WIN32_WINNT as a value of 0x0400. If I change this value (to 0x0500 for instance)or if I don't define it at all, some other stuff break in my code (error LNK2001: unresolved external symbol _CLSID_DOMDocument40)
Anyone has an idea how I could fix this conflict? Thanks in advance!
Jean-Francois !
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I got a rather difficult question for the group.
Here it is:
I have created a program that records flight simulator data. I added a feature that allows the user to record the data to a file.
I would like to have a feature that wrote the simulator data to memory and if the user wanted to playback the data they would hit a button and the data that was written to memory would be played back.
I was thinking alongs the lines as a circulatory buffer. (Once it reaches the end it starts over) I thought about making a timestamp, so they can choose from time (a) to time (b)
I don't know how large to make the buffer?
This program is the only thing running on the machine besides Windows
Any ideas on how I should go about this?
thanks,
steven
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