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Maybe this would help:
#pragma data_seg (".commondata")
extern =
#pragma data_seg ()
For more information, look here[^].
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The documentation[^] says:
GetProcAddress Function
Retrieves the address of an exported function or variable from the specified dynamic-link library (DLL).
...
So you probnably can access exported variables the same way as functions.
> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> "It doesn't work, fix it" does not qualify as a bug report. <
> Amazing what new features none of the programmers working on the project ever heard of you can learn about when reading what the marketing guys wrote about it. <
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Why don't you define an accessor function in the DLL?
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
[My articles]
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The dll is given by some vendor. Just im using that one. I cant define functions in dll.
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OK.
As side note, it is really strange that the vendor exposes a DLL's variable.
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
[My articles]
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After linking C++ project with specific .libs and when I run it, how does a system find the corresponding DLLs if they are not in the same directory?
There should be some rules for that, as far as I know.
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I believe the answer is right here[^] in a document titled Dynamic-Link Library Search Order.
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Thank you. I have been looking precisely for this.
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Most of the search rules are explained here[^].
Chris Meech
I am Canadian. [heard in a local bar]
In theory there is no difference between theory and practice. In practice there is. [Yogi Berra]
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I am writing a function pointer for a static member function and i am getting a C 2159 : ore than one storage class specified.
typedef static A* (*CreateInstance)();
When i build i get the error . Please let me know what i am doing wrong!!!!
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The static declarator is not allowed on a typedef, your declaration should read:
typedef A* (*CreateInstance)();
It's time for a new signature.
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You cannot use typedef and static that way. "static" defines a storage type for an instance (of whatever) and is not related to the type itself.
By
typedef A* (*CreateInstance)();
you have defined a type alias for a type "function taking no parameters and returning pointer to A". The name of the alias is CreateInstance and it is compatible with anything which satisfies this type definition. You can use your new alias as follows:
class AProvider {
public:
static A* Create() {
return new A();
}
};
A* StandAloneCreate() {
return new A();
}
...
CreateInstance Creator1 = StandaloneCreate;
CreateInstance Creator2 = AProvider::Create;
A* tA1Instance = Creator1();
A* tA2Instance = Creator2();
...
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Hi!
I've an array of strings called playerLst.It has many single space strings(e.g "SR Tendulkar"),three two space strings(e.g "AB de villiers") and one three space string(e.g "RE van der Merwe"). I've to split the strings into parts by the space as delimeter. I've split it like this:
vector<stringc> players;
for(int j = 0; j<playerLst.size(); j++)
{
playerLst[j].split(players, " ",1);
}
Now the vector "players" has strings split by the space. I've printed and verified this. I've to rearrange the last part in every string in the vector. The following code works correct for strings which contain single space in them.
array<stringc> nameFirstPart,nameSecondPart;
for(int i = 0; i<players.size(); i++)
{
srand(t);
nameSecondPart.push_back(swapChars(players[++i]).c_str());
t++;
}
What modification has to be done in the function call, to rearrange the last part of every string in the vector?
Also I've to re stitch the rearranged string to the first part if the string originally has two parts(e.g "SR Tendulkar"), second part if it has three parts(e.g "AB de villiers") and third part if it has four parts(e.g "RE van der Merwe"). How to do this?
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I will give you an answer here that is maybe not what you are looking for, but nevertheless I think important.
You have been asking roughly the same thing I don't know how many times by now, and you still have issues with your code. I think you need to step back and try to understand the fundamentals.
One way to get a grasp of what you are doing is to use (named) temporary variables. Try to break down your statements into smaller pieces, and store intermediate results. Be careful when naming things.
Most importantly, if you put your mind into solving each of your microproblems yourself, you will learn a lot more, and ultimately become a better programmer. In some respect, the easy access to a community like this can make you less productive in the long run.
I hope you find the solution to your problem, or that someone helps you. Good luck!
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I would echo Niklas's good advice. I have been watching these questions for some time and it seems to me you are trying to write rather more complex code without the understanding of some of the basics. The problem you are trying to solve here with strings is really a fairly simple one; or it would be if you spent some time looking at the STL classes and string[^] in particular. I will also give you a hint, in this question the only item you really need to split out is the very last portion, regardless of how many items precede it.
It's time for a new signature.
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Hi All,
I am exporting set of functions from an exe using DLLExport , and i want to call these in another dll . Can you please tell me what i need to do in the place where i am calling them..
Thanks,
Hari
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Include the header file that contains the function declarations of the exported functions.
This header usually has the __declspec(dllimport) statement, either as it is or hidden behind a macro.
Add the name of the LIB file corresponding to the DLL in Project -> Properties -> Configuration Properties -> Linker -> Input -> Additional Dependencies.
This is one way of doing it.
Another way is to call LoadLibrary on the DLL and then use GetProcAddress to load the exported function address to call.
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the LoadLibrary and GetProcAddress way has the advantage that the start of the calling dll always is working and you can check the for failures.
Press F1 for help or google it.
Greetings from Germany
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Hi sir,
I have origin axis(500,300) and x1,x2,y1,y2.
I want to draw a rectangle and rotate it with the given
I am able to draw a rectangle.
But how can i rotate a rectangle with given degree
Any idea will be helpful
Here is my code
center origin(center.x,center.y);
x1=50,2=50,y1=50,y2=50;
MoveToEx(pCellInfo->hDC,center.x-x1,center.y-y2,NULL);
Rectangle(pCellInfo->hDC,center.x-x1,center.y-y2,center.x+x2,center.y+y1);
Thanks in advance
Raj
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Well, you just need to rotate the four vertices around the origin
xr = x * cos(alpha) + y * sin(alpha);
yr = -x * sin(alpha) + y * cos(alpha);
and then draw the lines connecting them.
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
[My articles]
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Is their a way to hook a program that could check the program which is going to be executed before execution. I haven't found a way to implement such a process trap.
I stumbled upon User/Kernel Mode Drivers for the NT Kernel.
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Hello again,
I have three class and one mainframe for my project.
one class(calculator) holds bunch of functions and commands and button that works fine(formview class with mfc) in the same class i defined tabcontrol called mytabcontrol and in each tab i have one common class called tab_one. now tab_one gets data from calculator and displays graph of those values and when i switch tab it suppose to read data again from calculator and redraw graph. I tried invalidate() and invalidateRect functions but it shows m_hWnd has not been used and 0X000000.
if anyone got clue how to solve this. Please reply.
I will post details of program and problem later.
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Assuming it's the tab_one instances you are trying to repaint:
Have you created the instances of your tab_one class by using one of the various Create functions? From the error description it looks like you are trying to use a window object that was never created (or was created, but then destroyed)
Either you create all instances when you create the tab control, or you create the required instance when a tab is activated the first time.
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tab_one is child dialog and it is under mytabcontrol so if i switch tabs in tab control it calls method of my tab_one class.
Creation of tab_one.h :
class CTab_one : public CDialog
{
DECLARE_DYNAMIC(CTab_one)
private:
//variables
public:
CTab_one(CWnd * pParent=NULL); // standard constructor
virtual ~CTab_one();
#ifdef _DEBUG
virtual void AssertValid() const;
virtual void Dump(CDumpContext& dc) const;
#endif
// Dialog Data
public:
enum { IDD = IDD_TAB_ONE };
public:
//variables declaration
public:
//methods
virtual BOOL OnInitDialog();
protected:
virtual void OnPrint(CDC *pDC, CPrintInfo *pInfo);
virtual void OnDraw( CDC * pDC);
protected:
virtual void DoDataExchange(CDataExchange* pDX);
afx_msg void OnFileSave();
afx_msg void OnPaint();
afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);
DECLARE_MESSAGE_MAP()
};
#endif
tab_one.cpp
// CTab_one.cpp : implementation file
//
#include "stdafx.h"
#include "Tab_one.h"
#include "afxwin.h"
IMPLEMENT_DYNAMIC(CTab_one, CDialog)
CTab_one::CTab_one(CWnd* pParent /*=NULL*/)
: CDialog(CTab_one::IDD, pParent)
{
}
CTab_one::~CTab_one()
{
}
void CTab_one::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
}
BOOL CTab_one::OnInitDialog( void)
{
CDialog::OnInitDialog();
CTab_one::GetSafeHwnd();
CString cstring = " It exists";
if(::IsWindow(m_hWnd)) {
AfxMessageBox(cstring); // it does have value here
// - m_hWnd 0x000f0c30 {unused=??? } HWND__ *
unused CXX0030: Error: expression cannot be evaluated
}
GetParentFrame()->RecalcLayout();
CDialog *ctab; // to check m_hWnd value
GetDefaultValues();//method in tab_one
return true;
}
BOOL CTab_one::CreateModelessDlg(void)
{
// TODO: Add your specialized code here and/or call the base class
return (CDialog::Create(CTab_one::IDD, this)!=0);
}
int CTab_one::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
if (CDialog::OnCreate(lpCreateStruct) == -1)
return -1;
// TODO: Add your specialized creation code here
return 0;
}
BEGIN_MESSAGE_MAP(CTab_one, CDialog)
ON_WM_PAINT()
ON_WM_CREATE()
ON_COMMAND(ID_FILE_SAVE, OnFileSave)
END_MESSAGE_MAP()
void CTab_one::OnPrint( CDC * pDC, CPrintInfo * pInfo)
{
// TODO: add customized printing code here
this->OnDraw(pDC);
}
void CTab_one::OnPaint()
{
CPaintDC dc(this);
OnDraw( &dc );
}
#ifdef _DEBUG
void CTab_one::AssertValid() const
{
CDialog::AssertValid();
}
void CTab_one::Dump(CDumpContext& dc) const
{
CDialog::Dump(dc);
}
#endif //_DEBUG
// method that i am trying to access from mytab control
void ongraph1()....
calls updategraph()
void CTab_one::OnDraw(CDC * pDC)
{
CString szTitle;
(void)szTitle.LoadString(AFX_IDS_APP_TITLE);
AfxGetApp()->m_pMainWnd->SetWindowText(szTitle);
this->DrawCoordinates( pDC);// this draws lines in graph for all diffrent graphs
//draw graphics
DisplayTm_vs_Rb_Graph( pDC); // method that draws graph
} // end CGphView::OnDraw
void __stdcall CTab_one::DrawCoordinates( CDC * pDC)
{
}
finally :
void __stdcall CTab_one::UpdateGraph( )
{
InvalidateRect(NULL,false); // m_hwnd never used no value
}
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