Re: Using btimap resource from dll - C / C++ / MFC Discussion Boards

parths3-Oct-04 23:23

3-Oct-04 23:23

Another way might be to load the component with LoadLibrary[^] and call the function DllUnregisterServer[^]

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Calling mfc dll from visual basic

randynamics1-Oct-04 15:52

randynamics

1-Oct-04 15:52

hey! i saw an article about calling an mfc dll from visual basic here... my mf dll is using sockets.... vb can see the functions i put in the dll, my problem is.. once i start to connect to the server using this command pSockCon->Connect("1.1.1.26", 777); , it doesnt connect.... i tried to run the code of the dll in an mfc application and it works fine...i can see the output from my socket workbench... i just cant figure out what is happening when vb calls my function in my dll... it cant connect to the server although it works fine when i tested it in an mfc app.. pls help me.. Sigh | :sigh:

Re: Calling mfc dll from visual basic

ThatsAlok1-Oct-04 18:24

ThatsAlok

1-Oct-04 18:24

Buddy,
according to me,you can't called a simple DlL or rather plain dll in VB application.VB support only COM dll.

-----------------------------
"I Think It Will Help"
-----------------------------
Alok Gupta
visit me at http://www.thisisalok.tk

Re: Calling mfc dll from visual basic

randynamics2-Oct-04 21:17

randynamics

2-Oct-04 21:17

Hi Mr.Gupta,

thanks for the reply...i created my dll in mfc dll. i was told that the output of mfc dll is already a COM dll... do i still have to do something to make it a COM dll for my vb app to use it?

Re: Calling mfc dll from visual basic

Gary R. Wheeler2-Oct-04 12:49

Gary R. Wheeler

2-Oct-04 12:49

You need to make sure that your DLL is performing all of the initialization required (like calling WsaStartup()). It sounds like your MFC test app may be doing things that your VB app isn't.

Another debugging tip: Put a message box in the DLL code that shows you the error values from the connect.

Software Zen: delete this;

Re: Calling mfc dll from visual basic

randynamics3-Oct-04 18:25

randynamics

3-Oct-04 18:25

hi! i'm using the CSocket class instead of the winsock... when the dll is called from an MFC dialog based app, everything works fine but not if the dll is called from vb.net...i'm trying to find some initialization that might be needed.. actually.. it cant connect to the server when called in vb app although it does connect in mfc app. there is no error with the code it just doesnt connect... Sigh | :sigh:

Using btimap resource from dll

bigmirror1-Oct-04 14:28

bigmirror

1-Oct-04 14:28

I want to use bitmap resource in dll file.
If I get bitmap resource ID, LoadLibrary and get the bitmap so
I want to draw it.
How can I do?

Re: Using btimap resource from dll

Andrzej Markowski1-Oct-04 16:43

Andrzej Markowski

1-Oct-04 16:43

Do the following steps:

CBitmap bmpYourBitmap; // your bitmap
CDC *pDC; // device context for painting
//
// 1. Create a memory device context:
CDC memDC;
memDC.CreateCompatibleDC(pDC);
//
// 2. Select your bitmap into <code>memDC</code>:
CBitmap *pOldBmp = memDc.SelectObject(&bmpYourBitmap);
//
// 3. Get the size of <code>bmpYourBitmap</code>:
BITMAP bm;
bmpYouBitmap.GetBitmap(&bm);
//
// 4. Paint the bitmap:
pDC->BitBlt(0,0,bm.bmWidth,bm.bmHeight,&memDC,0,0,SRCCOPY);
memDc.SelectObject(pOldBmp);

Problem with FindWindow

Dev5781-Oct-04 14:25

Dev578

1-Oct-04 14:25

I want to get the HWND of a window by FindWindow(). The second parameter is the window name, but the window name I am trying to get has a copyright symbol in it (a c with a circle around it). Is there a way that I can have FindWindow() only search for the first few characters in the window name? or is there a way to put a copyright symbol in a string? Any help is appreciated.

-Dev578

Re: Problem with FindWindow

Jörgen Sigvardsson1-Oct-04 14:36

Jörgen Sigvardsson

1-Oct-04 14:36

Use the application "Character Map" which comes with windows. In Windows XP, it's located in Start -> Programs -> Accessories -> System Tools. Double click the copyright symbol, click copy, and then paste it into your C++ code. Or use the hex code \0xa9 in the string. Like this: "Copyright \x0a9 2004"

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protected constructor

leonid dmsi1-Oct-04 12:23

leonid dmsi

1-Oct-04 12:23

Hello,

I have following C++ class hiererarchy like this:

class CBase{
protected:
// Construction/Destraction
CBase(){};
CBase(const CBase& Src){}; // Copy constractor
virtual ~CBase(){};
// Operators
virtual const CBase& operator =(const CBase& Src){}; // = operator
};

class CDerived: public CBase{
public:
// Construction/Destraction
CDerived(){};
CDerived(const CDerived& Src); // Copy constractor
virtual ~CDerived(){};
// Operators
virtual const CDerived& operator =(const CDerived& Src); // = operator
};

CDerived::CDerived(const CDerived& Src):CBase((CBase) Src)
{
//Do something here....
}

const CDerived& CDerived::operator =(const CDerived& Src)
{
if(&Src == this)
return *this;
(Base) *this = (Base) Src;
// Do something here ...
return *this;
}

Visual C++.NET compiler generates errors:
error C2248: CBase::CBase' : cannot access protected member declared in class 'CBase'.

Obviously if I changed 'CBase' as following:
class CBase{
public:
// Construction/Destraction
CBase(){};
CBase(const CBase& Src){}; // Copy constractor
virtual ~CBase(){};
// Operators
virtual const CBase& operator =(const CBase& Src){}; // = operator
};

program would compile without problems. But I need keep 'CBase' construction protected to allow instantiation of 'CBase' only via derived classes.

Does anyone have an idea how this can be fixed? Any help will be greatly appreciated.

Thanks,

Leonid

Re: protected constructor

alex.barylski1-Oct-04 16:12

alex.barylski

1-Oct-04 16:12

Maybe look at MFC's CView...

It's created dynamically at runtime using CreateObject() I believe.

How do I print my voice mail?

typedef for Function Pointer

act_x1-Oct-04 10:59

act_x

1-Oct-04 10:59

typedef void SLIDER_EVENT_HANDLER (int ,int ) ;
typedef SLIDER_EVENT_HANDLER* SLIDER_FUNC_PTR ;

How can i do this in one line eliminating the need for SLIDER_EVENT_HANDLER ?

Thanks

Engineering is the effort !

Re: typedef for Function Pointer

Gary R. Wheeler1-Oct-04 12:39

Gary R. Wheeler

1-Oct-04 12:39

typedef void (SLIDER_FUNC_PTR *)(int,int);

Software Zen: delete this;

Re: typedef for Function Pointer

Jörgen Sigvardsson1-Oct-04 12:50

Jörgen Sigvardsson

1-Oct-04 12:50

Shouldn't that be typedef void (* SLIDER_FUNC_PTR)(int,int);?

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Suche Wissen über Alles.

Der Student

Re: typedef for Function Pointer

Michael Dunn1-Oct-04 14:03

Michael Dunn

1-Oct-04 14:03

Yes, the type name goes after the *, while the calling convention goes before it.

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Shareware stuff:: 1ClickPicGrabber | RightClick-Encrypt
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Re: typedef for Function Pointer

Gary R. Wheeler2-Oct-04 2:00

Gary R. Wheeler

2-Oct-04 2:00

Software Zen: delete this;

DLL problem

Larsson1-Oct-04 10:36

Larsson

1-Oct-04 10:36

Hello,
I need to save a CString in a DLL and I don'r get it to work.

*** Program 1 ***
CString sTest;
sTest = "Hello";
MyDll.Test(sTest);

*** Program 2 ***

OnTimer()
MyDll.Test(Will get the value that program 1 put here )

Byt it dont work I get a int 3 error
If I in Program 2 set a value on the CString then it work but then I don't get the value I need.

*** DLL Class ***

void getFunc( CString sValue )

if(sValue.IsEmty())
{
return;
}
else
{
Do something else!
}

So how can I save A special value from program 1
and check it from program 2?

Please help me.

Re: DLL problem

ThatsAlok1-Oct-04 18:30

ThatsAlok

1-Oct-04 18:30

Hi larsson
there may be many solution for your problem,but from my knowledge i Know two solution

#1 either declare that variable globlly static in your Dll

or
#2 your have to share them betwwen application
like this
[code]
#pragma data_seg(".SHARDAT")
CString m_strUpdate;
#pragma data_seg()

[/code]

-----------------------------
"I Think It Will Help"
-----------------------------
Alok Gupta
visit me at http://www.thisisalok.tk

Re: DLL problem

Larsson1-Oct-04 22:16

Larsson

1-Oct-04 22:16

Thanks I will try that.

#define style templates and float

J.B.1-Oct-04 9:15

J.B.

1-Oct-04 9:15

Hi guys,

I tried to compile and run a #define type templates example code in Visual C++:

#include <iostream>

#define define_max(type)	\
	type max(type d1, type d2) { \
		if (d1 > d2)	\
			return (d1); \
		return (d2);	\
	}

define_max(int);
define_max(float);
define_max(char);

int main(void)
{
	int i = max(100, 800);
	char ch = max('A', 'Q');
	float f = max(3.5, 8.7);

	return 0;
}

and I am getting compile error ambiguous call to overloaded function on the line

float f = max(3.5, 8.7);

If I replace float with double, it will compile and run ok. Does anyone know why that is? Is there some kind of limitation on uses of float in Visual C++?

Thanks alot

Re: #define style templates and float

David Crow1-Oct-04 9:35

David Crow

1-Oct-04 9:35

This is just a guess, but try replacing the four occurrences of max() with something like max1().

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: #define style templates and float

vcplusplus1-Oct-04 10:26

vcplusplus

1-Oct-04 10:26

3.5 and 8.7 are consider constant doubles.

When I compile the code below, VC gives me a warning for "a" but not for
"b"

float a = 2.4;
warning C4305: 'initializing' : truncation from 'const double' to 'float'

float b = 2.4f;

Re: #define style templates and float

J.B.1-Oct-04 19:46

J.B.

1-Oct-04 19:46

vcplusplus wrote:
float a = 2.4;warning C4305: 'initializing' : truncation from 'const double' to 'float'float b = 2.4f;

It makes a difference. I suppose the appended f tells the compiler to treat the numbers as float type?

Thanks.

How slow is GDI?

Budric B.1-Oct-04 6:13

Budric B.

1-Oct-04 6:13

Hi,
I have a simple program with a CFrameWnd. I override the OnPaint() function and draw some images. I preload a sequence of images using CxImage (separate objects for each one) and then I use CxImage::Draw() function to draw the particular image one at a time. The problem is that when I change the image being displayed (by changing some pointers to another image and just calling CxImage::Draw() on a different image in OnPaint()) there's a flicker as the images change. It's not that much and when the image is displayed it looks ok, but while the images change there's visible flicker. Is this due to how slow GDI is, or something I'm not doing correctly? The images are 640x480. How do windows that display movies work then (I'm not trying to display movies btw)?

By the way CxImage::Draw() after doing some weird things just calls SetDIBitsToDevice() Win32 function with the bits.

Thanks.

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