Calling dll function - C / C++ / MFC Discussion Boards

Re: Examples of SaveAs in winapi / c++

CPallini17-Nov-09 2:46

CPallini

17-Nov-09 2:46

Not sure I got you, anyway an usage example is here [^].
Smile | :)

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]

Re: Examples of SaveAs in winapi / c++

Nicola Curran17-Nov-09 3:10

Nicola Curran

17-Nov-09 3:10

OMG I dispare! The reason it wasn't working is because I'm a moron....I mean because I wasn't adding .xml to the end of the supplied file name in the gui. Doh!

Re: Examples of SaveAs in winapi / c++

Nicola Curran17-Nov-09 3:13

Nicola Curran

17-Nov-09 3:13

No wait, maybe it was something else....Here is the working code for any searching people:

char buffer[256]={""};
char tmp[256]={""};
tmp[0] = '\0';
GetEnvironmentVariable("USERPROFILE", buffer, sizeof(buffer));

OPENFILENAME _openfile;
ZeroMemory(&_openfile, sizeof(OPENFILENAME));
_openfile.lStructSize = sizeof(OPENFILENAME);
_openfile.hwndOwner = GetFocus();
_openfile.lpstrFilter = "Extensible Markup Language (*.xml)";
_openfile.lpstrFile = tmp;
_openfile.nMaxFile = sizeof(tmp)/sizeof(*tmp);
_openfile.lpstrFileTitle = "Save As ...";
_openfile.lCustData = (DWORD)NULL;
_openfile.lpstrInitialDir = strcat(buffer, "\\Desktop\\"); /*virtalis_diagnostic_info.xml");*/
_openfile.lpstrDefExt = "xml";

bool success = false;
success = GetSaveFileName(&_openfile);
DWORD error = CommDlgExtendedError();

HANDLE file = CreateFile((LPTSTR)_openfile.lpstrFile,
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ, NULL, CREATE_NEW, FILE_ATTRIBUTE_NORMAL,
NULL);

I hope this helps some idot n00b like myself!

Re: Examples of SaveAs in winapi / c++

Nicola Curran17-Nov-09 3:13

Nicola Curran

17-Nov-09 3:13

Also, thank you very much. Smile | :)

Dont send error message occured only once

thippipriya17-Nov-09 2:02

thippipriya

17-Nov-09 2:02

In VC++,
When the Application is installed and opened for the first time and after performing Test in the panel and report(Report tab- it has been created based upon excel tab view) is viewed and while going back to the any test panel ABC.exe – Application error is coming and application gets quited once OK is given in that error message or Dont send error message is occureed.
It has been occurred only once. Again i have uninstalled and installed the application. I have executed the same sequence, but the error has not occurred for the next time. I have installed and uninstalled the application for 10 times, but the problem occurred only one. it is not occurring every time. i have stored all reports in the file.
In Report panel, i get the last test report and will be displayed.

Please give me the solution for this problem.

Re: Dont send error message occured only once

David Crow17-Nov-09 3:37

David Crow

17-Nov-09 3:37

thippipriya wrote:
Please give me the solution for this problem.

What C/C++/MFC problem are you having?

"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown

"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

Re: Dont send error message occured only once [modified]

thippipriya17-Nov-09 16:25

thippipriya

17-Nov-09 16:25

it is in MFC.

My application is causing problems now and again, but only after creating setup mode so I am having
trouble finding the cause of it.

"The instruction at "0x73dd1351" referenced at "0x00000004". The memory could not be "read".

above is message I receive when the crash happens.

Any suggestions on how I may go about finding this little blighter!

The strange thing is that I may try it 100 time and it works fine, or 9 times and get error on 10th.
There really is no pattern to it. The code is doing the same thing with the same hardcoded data
each time. Sometimes yeah but sometimes no

modified on Wednesday, November 18, 2009 1:04 AM

Calling dll function

Le@rner17-Nov-09 1:05

Le@rner

17-Nov-09 1:05

Hi all,

I have made a Regular dll using shared mfc dll in that dll i have made a generic class in that class i have made a function SayHello

in .cpp file
CString CMyClass::SayHello(CString str)
{
	return (_T("Hello") + str);
}
in .h file
_declspec(dllimport) CString SayHello(CString str);

now i want to call this function in my clients application.

i have copied its .dll file and .lib file in applications debug folder.

and in properties\Linker\input\Additional Dependencies\..\Debug\MyDll.lib

now in code

HINSTANCE hDll = ::LoadLibrary(_T("MyDll.dll"));

now i want to call SayHello Function

How to do it?

Thanks in advance

To accomplish great things, we must not only act, but also dream;
not only plan, but also believe.

Re: Calling dll function

SandipG 17-Nov-09 1:29

SandipG

17-Nov-09 1:29

See here[^]

Regards,
Sandip.

Re: Calling dll function

Kushagra Tiwari17-Nov-09 2:46

Kushagra Tiwari

17-Nov-09 2:46

Hey,

U have won half of the battle . Now all you need to do is call GetProcAddress() see here:
http://msdn.microsoft.com/en-us/library/ms683212(VS.85).aspx[^] and then you will have to use the function pointer of your method to call your function.

Kushagra

How to create a vector?

deadlyabbas17-Nov-09 0:58

deadlyabbas

17-Nov-09 0:58

Hi All,

I have a member variable of data type double.
Following is the variable
double m_Value [7] [3];

Now I have to do the declaration by using vectors.
so how I will declare it.
I have to Initialize it by 0 also..........

Thanks

Re: How to create a vector?

Jijo.Raj17-Nov-09 1:30

Jijo.Raj

17-Nov-09 1:30

Hi deadlyabbas,

const int ROW = 7;     // Row
const int COLUMN = 3;  // Column

// same as - double m_Value [7] [3]; initialized with 0.0
// vector can be initialized by - vector<type>( size, DefaultValue );
vector< vector<double> > m_Value( ROW, vector<double>( COLUMN, 0.0 ));

Best Regards,
Jijo.

_____________________________________________________

http://weseetips.com[^] Visual C++ tips and tricks. Updated daily.

Re: How to create a vector?

deadlyabbas17-Nov-09 3:50

deadlyabbas

17-Nov-09 3:50

Thanks Jijo.
But the issue with this is that I am not able to make declaration and definition separately.
If I do it like this in .h file

vector<vector <double>> m_Value;

and in .cpp file I do this

m_value(10,vector(3,0.0));

It gave me an error which says
error C2064: term does not evaluate to a function taking 2 arguments

Re: How to create a vector?

«_Superman_»17-Nov-09 7:17

«_Superman_»

17-Nov-09 7:17

You should be able to do this using the constructor initialization list.

MyClass.h file

class CMyClass
{
private:
    vector< vector<double> > m_Value;
};

MyClass.cpp

CMyClass::CMyClass() : m_Value(ROW, vector<double>( COLUMN, 0.0 ))
{
}

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

dde problem

trioum17-Nov-09 0:24

trioum

17-Nov-09 0:24

how to pass char array using DdeCreateDataHandle() to excel

Trioum

Find out Build Configuration from exe

Maya_16-Nov-09 23:21

Maya_

16-Nov-09 23:21

Hi,

Is there anyway to find out in which build configuration it was built from an exe?!!

Thanks for any help!!
Regards,
Maya

Re: Find out Build Configuration from exe

Randor 17-Nov-09 2:13

Randor

17-Nov-09 2:13

Hi Maya,

The PE format is documented here:

Microsoft Portable Executable and Common Object File Format Specification[^]

You can check the IMAGE_FILE_HEADER section[^] of the COFF header for the IMAGE_FILE_DEBUG_STRIPPED flag. Here is an example:

BOOL IsDebugImage(LPTSTR szPath)
{
	BOOL bRet = FALSE;
	HANDLE hFile = CreateFile(szPath,GENERIC_WRITE | GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL);
	if(NULL != hFile)
	{
		LARGE_INTEGER bigInt;
		if(TRUE == GetFileSizeEx(hFile, &bigInt))
		{
			HANDLE hFileMap = CreateFileMapping(hFile,NULL,PAGE_READWRITE,bigInt.HighPart,bigInt.LowPart + 0x2000 ,NULL);
			if(NULL != hFileMap)
			{
				LPVOID hMap = MapViewOfFile(hFileMap,FILE_MAP_READ,0,0,0);
				if(NULL != hMap)
				{
					HMODULE hModule = (HMODULE)hMap;
					IMAGE_DOS_HEADER * pDosHeader = (IMAGE_DOS_HEADER *)hModule;
					IMAGE_FILE_HEADER * pFileHeader = (IMAGE_FILE_HEADER *)(((LPBYTE)hModule) + pDosHeader->e_lfanew + sizeof(IMAGE_NT_SIGNATURE));	
					
					bRet =  !(pFileHeader->Characteristics &IMAGE_FILE_DEBUG_STRIPPED);
					
					UnmapViewOfFile(hFileMap);
				}
				CloseHandle(hFileMap);
			}
		}
		CloseHandle(hFile);
	}
	return bRet;
}

Best Wishes,
-David Delaune

Re: Find out Build Configuration from exe

David Crow17-Nov-09 3:43

David Crow

17-Nov-09 3:43

How does file mapping compare to using ReadFile() to read the header information?

Re: Find out Build Configuration from exe

Randor 17-Nov-09 11:21

Randor

17-Nov-09 11:21

Hi DavidCrow,

The difference is that CreateFileMapping will load the entire executable into virtual memory. Using CreateFile/ReadFile will probably map an executable into the pagefile up to the allocation granularity of the system which is 64K on a 32 bit NT OS depending on which CreateFile flags have been used.

Typically when I iterate through PE sections and read data I use CreateFileMapping for performance reasons. Although for simply checking the IMAGE_FILE_DEBUG_STRIPPED flag a series of ReadFile calls would be sufficient.

At any rate... a code sample is exactly that. It is a code sample.

Best Wishes,
-David Delaune

Re: Find out Build Configuration from exe

Maya_17-Nov-09 5:22

Maya_

17-Nov-09 5:22

Thank you David for the info, i will go through the links Smile | :)

Thanks again

Re: Find out Build Configuration from exe

Maya_17-Nov-09 16:05

Maya_

17-Nov-09 16:05

Hi David,

I have another question on this. The method you have given tells us whether the image is a debug image or release image, if im not wrong. Is there any way to find out in which specific 'release build configuration' the image was built?? Like ReleaseMinSize or ReleaseMinDependency??

I went through the links that you provided but couldnt find a way. Please do let me know if theres any way to find this. Appreciate your help Smile | :)

Regards,
Maya

Re: Find out Build Configuration from exe

Randor 17-Nov-09 16:29

Randor

17-Nov-09 16:29

Hi Maya,

The terms ReleaseMinSize and ReleaseMinDependency are only words to describe a dynamic set of compiler options. There is nothing preventing you from choosing ReleaseMinSize inside Visual Studio and making it identical to a Debug build.

In fact... in Visual Studio you can create your own build setting. For example:

1.) Choose Build from the Visual Studio system menu.
2.) Choose 'Configuration Manager' from the drop down menu.
3.) In the 'Active Solution Configuration' combobox choose 'New'
4.) Observe that you can create a new build configuration and name it anything you wish.

You can detect the following for example:

1.) You can detect if the PE image has debug information.
2.) You can test for a specific dependency such as CRT or MFC dynamic linkage.

There are all sorts of other possibilities but you need to realize that the words ReleaseMinSize and ReleaseMinDependency are dynamic and have no specific meaning to the MSVC compiler.

Can you tell me exactly what you are trying to accomplish?

Best Wishes,
-David Delaune

Re: Find out Build Configuration from exe

Maya_18-Nov-09 2:32

Maya_

18-Nov-09 2:32

I was trying to create a utility that would tell me what configuration an exe was built in. But as you say its just a set of compiler options. I understand it now. Thanks for explaining. I have a lot more questions but ill save it for another time. Smile | :)

dll for middleware

Eka Candra16-Nov-09 20:24

Eka Candra

16-Nov-09 20:24

Dear all,

I have problem.
What kind of dll that can store some functions and variables, and register it to windows runtime?

So that, I can execute (install) that dll from Windows Explorer and when I want store a value, say it name, I just write on my program:

data.name

without any declaration of Class Data.

And if I have a function in that class, say it write, I just write on my program :

data.write

Furthermore, write function will get value from variable name with another variables.

Please help me...

Thanks b4,
Eka Candra

Re: dll for middleware

CPallini16-Nov-09 20:41

CPallini

16-Nov-09 20:41

Eka Candra wrote:
What kind of dll that can store some functions and variables

A C++ DLL, exporting classes. Visual Studio's Application Wizard may build the DLL skeleton for you.

Eka Candra wrote:
and register it to windows runtime?

Only COM DLLs need registration.
Smile | :)

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