C / C++ / MFC Discussion Boards

Mike Zinni10-Mar-03 10:26

10-Mar-03 10:26

If you've got some $$ to spare, check this book out:

http://search.barnesandnoble.com/booksearch/isbnInquiry.asp?userid=185PAJ3VB3&isbn=0735615799&itm=3[^]

I recently bought it, and it's a great way to learn how windows sockets work. Hope this helps!

-Mike Zinni

"No sh*t it's tough. If it wasn't, everybody and their sister would be an engineer and then you wouldn't have a job."

Re: Windows Networking reference

Kuniva10-Mar-03 11:00

Kuniva

10-Mar-03 11:00

But why buy expensive books when u learn learn learn from the internet! Big Grin | :-D

It's how i got all my knowledge (not that its that much lol) and the books i did buy (3 now, and only 1 is about C/C++) didn't help me much at all!

Oh wait.. there's a simple answer to my first question. Don't say it! To pay the authors salary because we might end up writing a book of our own one day and we would want people to buy it and not just look it all up on the internet. Poke tongue | ;-P

Kuniva
--------------------------------------------

Re: Windows Networking reference

valikac10-Mar-03 11:09

valikac

10-Mar-03 11:09

I highly recommend Network Programming for Microsoft Windows, Second Edition
by Anthony Jones and Jim Ohmund.

Kuphryn

NT I/O Port access !? Is it easy?

Behzad Ebrahimi10-Mar-03 6:29

Behzad Ebrahimi

10-Mar-03 6:29

Hi,
How can I access to I/O port in NT Windows?

Thank you for your guides, beforehand. Rose | [Rose]

Re: NT I/O Port access !? Is it easy?

Tim Smith10-Mar-03 6:40

Tim Smith

10-Mar-03 6:40

You can use WinRT http://www.pds-site.com/Bsquare/WinRT/default.htm[^].

Or you could write your own device driver.

However, user mode code isn't allowed to access i/o ports directly since that would be a security violation.

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

Passing Strings to and from VB via a dll

dazinith10-Mar-03 6:18

dazinith

10-Mar-03 6:18

i am so utterly frustrated right now.. i have been trying to pass a string from VB into a function, modify it and return it back to VB.. but i just cannot understand this BSTR crap.. i have tried to accomplish this 2 ways and im stuck both.. so im gunna list em both, and maybe someone will know how to fix one? thanks a bunch for any advice..

Problem number 1:
I pass 3 variables into my function..
FindBankName(strFilename, strRoutingNumber, strBankName)
when i call this function from VB i pass it these values in this order:
("C:\\FedACHdir.txt", "282976020", "bankname")
but as you will see below my c++ function does not get them in this order..
c++ function:

void __stdcall CFpsPayTaxxApp::FindBankName(BSTR strFilename, BSTR strRoutingNumber, BSTR strBankName)
{
	CString strTemp;
	strTemp = "The Filename passed is: >" + (CString) (LPCTSTR)strFilename + "<";
	AfxMessageBox(strTemp);
	
	strTemp = "The RoutingNumber passed is: >" + (CString)(LPCTSTR)strRoutingNumber + "<";
	AfxMessageBox(strTemp);

	strTemp = "The BankName passed is: >" + (CString)(LPCTSTR)strBankName + "<";
	AfxMessageBox(strTemp);
}

what i get for output is 3 message boxes.. the first says ">282976020<", the second ">bankname<", and the third has funky characters.. so the first parameter is never seen.. i have tried passing by reference, not by reference, passing with a return value, without a return value, passing as char* instead of BSTR, but i never get the first parameter.. the other problem with this approach is that i crash when i modify the passed in BSTR's..

Problem number 2:
I tried to take an ATL dll that is on CP which has examples involving BSTR's.. i got that dll to work fine with the parameters being passed.. the function even modified the string and returned it as modified (which i cant seem to do in the first method at all without crashing).. the problem here is that i can't seem to modify the string and return it.. probably because i am not handling the BSTR's properly.. but at least the example works, its just way to cryptic for me.. here is what i have trying to just return the variable modified.. it doesn't work either..

void __stdcall GetBankName(BSTR strFilename, BSTR strRoutingNumber, BSTR strBankName, BSTR strErrResponce)
{
strBankName = "what the?";
}

this doesnt change the text.. and the example i have i cant even follow..http://www.codeproject.com/dll/superdll.asp[^]

Conclusion:
problem #1 working would be alot better for me because i could use CStrings and other MFC things, where as problem #2 uses ATL and I am so lost dealing with these BSTR strings.. all I need to do is be able to set a char* array to a BSTR.. but i just cant seem to follow it..

if you have any idea what im doing wrong in #1, or can offer some suggestions on understanding modifying BSTR's in problem #2 i would be very appreciative.. thanks Confused | :confused:

still a newb.. cut me some slack :P
-dz

Re: Passing Strings to and from VB via a dll

AlexO10-Mar-03 6:29

AlexO

10-Mar-03 6:29

"(CString) (LPCTSTR)strFilename " is very bad idea.
try
a)
#include "comdef.h"
CString str = _bstr_t(strFilename);

b.)
CString str = OLE2T(strFilename);

Re: Passing Strings to and from VB via a dll

dazinith10-Mar-03 7:27

dazinith

10-Mar-03 7:27

ill keep that in mind.. how would i turn it back to a CString, or better yet how would i turn a BSTR to a char* and then back to a BSTR?

still a newb.. cut me some slack :P
-dz

Re: Passing Strings to and from VB via a dll

Brian Shifrin10-Mar-03 8:58

Brian Shifrin

10-Mar-03 8:58

void functionF(BSTR bstr)
{
CComBSTR cBstr = bstr;
CString str(bstr);
CString strAppend;

strAppent = str + CString(bstr); //Appending Strings
strAppend += str;

//Similiar with CComBSTR and _bstr_t

}

Re: Passing Strings to and from VB via a dll

dazinith10-Mar-03 7:51

dazinith

10-Mar-03 7:51

hrm.. seems the whole problem is that i was listing the classname in front of the function like:
void __stdcall CFpsPayTaxxApp::FindBankName(BSTR strFilename, BSTR strRoutingNumber, BSTR strBankName)
i took off the classname in front of the function and it now the vars come in fine..
void __stdcall FindBankName(LPSTR strFilename, LPSTR strRoutingNumber, LPSTR strBankName)

wierd stuff.

still a newb.. cut me some slack :P
-dz

CDialog from a MFC dll...

RobJones10-Mar-03 6:09

RobJones

10-Mar-03 6:09

Hello,
I have never tried to load a dialog box from a dll.. I have created a Static MFC DLL and created a dialog within the dll.. I used this to export the class hoping that this would allow me to use the dialog..

class AFX_EXT_CLASS CSettingsDlg : public CDialog
{
public:
	CSettingsDlg();
	~CSettingsDlg();

// Dialog Data
	//{{AFX_DATA(CSettingsDlg)
	enum { IDD = IDD_SETTINGS }; <------HERE
	//}}AFX_DATA

..... BLAH BLAH

The problem is when I add the .lib, .h and dll to the other application and try to compile it I get an error on this line..

enum { IDD = IDD_SETTINGS }; <--

Any ideas?

Rob

Whoever said nothing's impossible never tried slamming a revolving door!

Re: CDialog from a MFC dll...

Bill Gates Antimatter Particle10-Mar-03 6:35

Bill Gates Antimatter Particle

10-Mar-03 6:35

You need to set the resource handle to the dll the switch it back again;
you should see a line of code like this somewhere in your dll, probably near DllMain function:

static AFX_EXTENSION_MODULE MyDLL = { NULL, NULL };

define a
HMODULE MyModuleHandle;
globally;

in DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID lpReserved)
{
...
new CDynLinkLibrary(MyDLL);
//Add this line
MyModuleHandle = MyDLL.hModule;
}

then before you create your dialog, do something like this:

HINSTANCE pPreviousInstance = AfxGetResourceHandle();
AfxSetResourceHandle(MyModuleHandle);
m_pMyDialog = new CMyDialog();
...
AfxSetResourceHandle(pPreviousInstance);

this should solve that problem..
Big Grin | :-D

"Life begins at 140"

Re: CDialog from a MFC dll...

Alvaro Mendez10-Mar-03 7:36

Alvaro Mendez

10-Mar-03 7:36

Try adding:

#include "resource.h"

to the top of the header file (SettingsDlg.h).

Regards,
Alvaro

Quitters never win. Winners never quit. But those who never win and never quit are idiots. -- despair.com

Change menu name on run-time

whofmans10-Mar-03 5:55

whofmans

10-Mar-03 5:55

Hello!

How can i change a menu name on runtime. With the menu-name i mean by example "File", "Edit" or "Help". Submenu's is not a problem for me because they have a ResourceID, but the menu's that i want to change on runtime does not have that, or i can't find them?

Thanks for helping me.

Re: Change menu name on run-time

RobJones10-Mar-03 6:16

RobJones

10-Mar-03 6:16

I haven't tried this but it should work.. where 0 is the first item on the menu like "File".

CMenu *pMenu = GetMenu();
CString csMnuStr;
pMenu->GetMenuString(0, csMnuStr, MF_BYPOSITION);
pMenu->ModifyMenu(0, MF_BYPOSITION, 0, "New Text");
DrawMenuBar();

Rob

Whoever said nothing's impossible never tried slamming a revolving door!

Thanks! I have used it for language translation

whofmans10-Mar-03 23:47

whofmans

10-Mar-03 23:47

Thanks!

Now automaticly all the menu-item texts goes through a translate function. So that my program works with different language's.

<br />
	// TRANSLATE THE MENUS!<br />
	CMenu *pMenu = GetMenu();<br />
	CMenu *pSubMenu;<br />
	CMenu *pSubSubMenu;<br />
<br />
	CString csMnuStr;<br />
	<br />
	for(int i=0; pMenu->GetMenuState(i, MF_BYPOSITION) != -1; i++) // MENU<br />
	{<br />
		if(pMenu->GetMenuString(i, csMnuStr, MF_BYPOSITION) < 1) // empty string<br />
			continue;<br />
<br />
		pMenu->ModifyMenu(i, MF_BYPOSITION, 0, theApp.translate(csMnuStr));<br />
		<br />
		pSubMenu = pMenu->GetSubMenu(i);	// Get menu items<br />
		<br />
		if(pSubMenu == NULL)	// Submenu does not exist<br />
			continue;<br />
		<br />
		for(int j=0; pSubMenu->GetMenuState(j, MF_BYPOSITION) != -1; j++) // SUBMENU<br />
		{<br />
			if(pSubMenu->GetMenuString(j, csMnuStr, MF_BYPOSITION) < 1)	// empty string<br />
				continue;<br />
<br />
			pSubMenu->ModifyMenu(j, MF_BYPOSITION, 0, theApp.translate(csMnuStr));<br />
<br />
			pSubSubMenu = pSubMenu->GetSubMenu(j);	// get sub menu items<br />
			<br />
			if(pSubSubMenu == NULL)	// SubSubMenu does not exist<br />
				continue;<br />
			<br />
			for(int k=0; pSubSubMenu->GetMenuState(k, MF_BYPOSITION) != -1; k++) // SUB-SUBMENU<br />
			{<br />
				if(pSubSubMenu->GetMenuString(k, csMnuStr, MF_BYPOSITION) < 1)	// empty string<br />
					continue;<br />
<br />
				pSubSubMenu->ModifyMenu(k, MF_BYPOSITION, 0, theApp.translate(csMnuStr));<br />
			}		<br />
		}<br />
	}<br />
	DrawMenuBar();<br />

Thanks! I have used it for language translation

whofmans10-Mar-03 23:51

whofmans

10-Mar-03 23:51

Thanks!

Now automaticly all the menu-item texts goes through a translate function. So that my program works with different language's.

<br />
	// TRANSLATE THE MENUS!<br />
	CMenu *pMenu = GetMenu();<br />
	CMenu *pSubMenu;<br />
	CMenu *pSubSubMenu;<br />
<br />
	CString csMnuStr;<br />
	<br />
	for(int i=0; pMenu->GetMenuState(i, MF_BYPOSITION) != -1; i++) // MENU<br />
	{<br />
		if(pMenu->GetMenuString(i, csMnuStr, MF_BYPOSITION) < 1) // empty string<br />
			continue;<br />
<br />
		pMenu->ModifyMenu(i, MF_BYPOSITION, 0, theApp.translate(csMnuStr));<br />
		<br />
		pSubMenu = pMenu->GetSubMenu(i);	// Get menu items<br />
		<br />
		if(pSubMenu == NULL)	// Submenu does not exist<br />
			continue;<br />
		<br />
		for(int j=0; pSubMenu->GetMenuState(j, MF_BYPOSITION) != -1; j++) // SUBMENU<br />
		{<br />
			if(pSubMenu->GetMenuString(j, csMnuStr, MF_BYPOSITION) < 1)	// empty string<br />
				continue;<br />
<br />
			pSubMenu->ModifyMenu(j, MF_BYPOSITION, 0, theApp.translate(csMnuStr));<br />
<br />
			pSubSubMenu = pSubMenu->GetSubMenu(j);	// get sub menu items<br />
			<br />
			if(pSubSubMenu == NULL)	// SubSubMenu does not exist<br />
				continue;<br />
			<br />
			for(int k=0; pSubSubMenu->GetMenuState(k, MF_BYPOSITION) != -1; k++) // SUB-SUBMENU<br />
			{<br />
				if(pSubSubMenu->GetMenuString(k, csMnuStr, MF_BYPOSITION) < 1)	// empty string<br />
					continue;<br />
<br />
				pSubSubMenu->ModifyMenu(k, MF_BYPOSITION, 0, theApp.translate(csMnuStr));<br />
			}		<br />
		}<br />
	}<br />
	DrawMenuBar();<br />

Thanks! I have used it for language translation

whofmans10-Mar-03 23:56

whofmans

10-Mar-03 23:56

Thanks!

Now automaticly all the menu-item texts goes through a translate function. So that my program works with different language's.

<br />
	// TRANSLATE THE MENUS!<br />
	CMenu *pMenu = GetMenu();<br />
	CMenu *pSubMenu;<br />
	CMenu *pSubSubMenu;<br />
<br />
	CString csMnuStr;<br />
	<br />
	for(int i=0; pMenu->GetMenuState(i, MF_BYPOSITION) != -1; i++) // MENU<br />
	{<br />
		if(pMenu->GetMenuString(i, csMnuStr, MF_BYPOSITION) < 1) // empty string<br />
			continue;<br />
<br />
		pMenu->ModifyMenu(i, MF_BYPOSITION, 0, theApp.translate(csMnuStr));<br />
		<br />
		pSubMenu = pMenu->GetSubMenu(i);	// Get menu items<br />
		<br />
		if(pSubMenu == NULL)	// Submenu does not exist<br />
			continue;<br />
		<br />
		for(int j=0; pSubMenu->GetMenuState(j, MF_BYPOSITION) != -1; j++) // SUBMENU<br />
		{<br />
			if(pSubMenu->GetMenuString(j, csMnuStr, MF_BYPOSITION) < 1)	// empty string<br />
				continue;<br />
<br />
			pSubMenu->ModifyMenu(j, MF_BYPOSITION, 0, theApp.translate(csMnuStr));<br />
<br />
			pSubSubMenu = pSubMenu->GetSubMenu(j);	// get sub menu items<br />
			<br />
			if(pSubSubMenu == NULL)	// SubSubMenu does not exist<br />
				continue;<br />
			<br />
			for(int k=0; pSubSubMenu->GetMenuState(k, MF_BYPOSITION) != -1; k++) // SUB-SUBMENU<br />
			{<br />
				if(pSubSubMenu->GetMenuString(k, csMnuStr, MF_BYPOSITION) < 1)	// empty string<br />
					continue;<br />
<br />
				pSubSubMenu->ModifyMenu(k, MF_BYPOSITION, 0, theApp.translate(csMnuStr));<br />
			}		<br />
		}<br />
	}<br />
	DrawMenuBar();<br />

Willem

Re: Change menu name on run-time

Renjith Ramachandran10-Mar-03 7:49

Renjith Ramachandran

10-Mar-03 7:49

try DrawMenuBar()

CodeTheDreams();

new comer

Mr. Andrea10-Mar-03 5:16

Mr. Andrea

10-Mar-03 5:16

Within a few days I'll begin to submit my arguments.

Re: new comer

Maximilien10-Mar-03 5:29

Maximilien

10-Mar-03 5:29

Mr. Andrea wrote:
Within a few days I'll begin to submit my arguments.

Confused | :confused:

On what subject ?

Maximilien Lincourt
For success one must aquire one's self

Re: new comer

Alvaro Mendez10-Mar-03 7:37

Alvaro Mendez

10-Mar-03 7:37

Why?

Quitters never win. Winners never quit. But those who never win and never quit are idiots. -- despair.com

save increment filenames...

macmac3810-Mar-03 5:10

macmac38

10-Mar-03 5:10

Hi,

i like to save received data files (.pmj) from a scanner serially numbered on my disc (001.pmj, 002.pmj, ...) I know i must work with a loop and a variable, but it is too tricky for me.

Untill now i do the following:

// Save the file...
if (r)
{

CString fileName = "e:\\data\\001.pmj";
SavePMJStream(fileName);
}

Thanks for help, Mark

Re: save increment filenames...

Maximilien10-Mar-03 5:24

Maximilien

10-Mar-03 5:24

use a int variable to hold the counter ( file number )
use CString::Format to format the counter into a string.

use the for loop to increment the counter and format filename as a string, and pass it to the SavePMJStream .

Max.

Maximilien Lincourt
For success one must aquire one's self

Re: save increment filenames...

Renjith Ramachandran10-Mar-03 7:54

Renjith Ramachandran

10-Mar-03 7:54

macmac38 wrote:
Untill now i do the following:

// Save the file...
if (r)
{

CString fileName = "e:\\data\\001.pmj";
SavePMJStream(fileName);
}

----------------------------
CString csPath, csFileName;
int nLastFile;//Keep SomeWhere (Registry/file)

csPath = "e:\\Data\\";

if (r)
{
csFileName.Format("%03d", ++nLastFile);
csPath +=csFileName;
SavePMJStream(csPath);

}

Why Not THIS.?????

CodeTheDreams();

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