C / C++ / MFC

InstallShield's CallDLLFx

27-Aug-02 22:24

Well, technically speaking the view is created, but its frame isn't visible at this moment. If you need to show dialog when view is visible, call PostMessage (not SendMessage!) in OnInitialUpdate and provide handler for appropriate command in CYourView:

void CYourView::OnInitialUpdate()
{
...
PostMessage(WM_COMMAND, ID_SHOW_YOUR_DIALOG);
}

ID_SHOW_YOUR_DIALOG may appear in menu as well. Messages posted with PostMessage are going through message queue and will be processed after view initialization ends.

Tomasz Sowinski -- http://www.shooltz.com

Free your mind and your ass will follow.

achandra00727-Aug-02 5:09

achandra007

27-Aug-02 5:09

What I need to do is to install ODBC DSNs while installing my main application.

I am trying to use the CallDLLFx function of InstallShield to do this - the DLL has one function that installs the DSNs which InstallShield can call.

My function declaration is

static LONG APIENTRY CreateApplicationDSN(HWND hWnd,LPLONG lplValue,LPSTR lpszValue);

My CallDLLFx in InstallShield looks like this:

<br />
function SetupODBCDrivers()<br />
<br />
STRING szDll;<br />
STRING szFunction;<br />
LONG lValue;<br />
STRING svValue;<br />
LONG lResult;<br />
<br />
begin<br />
    szDll = TARGETDIR ^ "ConfigAppODBC.dll";<br />
    szFunction = "CreateApplicationDSN";<br />
    svValue = "";<br />
    lValue = 0;<br />
    lResult = CallDLLFx ( szDll , szFunction, lValue, svValue );<br />
<br />
    if(lResult = 0 || lResult = 1)<br />
    then<br />
        return lResult;<br />
    else<br />
        return -1;<br />
    endif;<br />
end;<br />
<br />

I consistently get a -1 from this function. The DLL function ConfigAppDSN returns a 0 or a 1 based on a successful install or not.

What am I doing wrong. One thing I do know is that I do not have the ConfigAppDSN function in the .DEF file. When I do put it there, I get a linker LINK2001 error.

Thanks
ashish

Re: InstallShield's CallDLLFx

Stephane Rodriguez.27-Aug-02 7:52

Stephane Rodriguez.

27-Aug-02 7:52

From what I remember (back in 1999), CallDLLDx lets you call a DLL function but you must respect rules for the function. I believe you have a topic in InstallShield doc that tells you what is the signature of the outside function you call. In other words, I believe you need to have an intermediate DLL exporting an entry-point function with a known signature. And this DLL will do ::LoadLibrary("configappodbc.dll") and ::GetProcAddress...

And I swallow a small raisin.

Did I Miss Something Here...

Nick Parker27-Aug-02 4:44

27-Aug-02 4:44

Ok, after the first day back to school I am working on a little app, which is an assignment. I am not asking for anyone to do it for me, however this error doesn't make sense to me. Here is the contents of my header file:

//==============================
//
// Nick Parker
// nparker@iastate.edu
// hw1.h
//
//==============================


#ifndef HW1_H
#define HW1_H

#include <fstream.h>
#include <iomanip.h>


//==============================
// Application file names
//==============================

#define ListOfDivers "divers.dat"
#define OutputFile "output.dat"
#define ReportFile "report.dat"


//==============================
// Constant variables
//==============================

const int Total_Divers = 24;
const int Best_Divers = 12;
const int Num_Of_Dives = 10;
const int Num_Of_Scores = 7;



//==============================
// Create Data Structures
//==============================

struct Dive_Stats
{
	float difficulty;
	float scores[Num_Of_Scores];
};

struct Diver_Info 
{
	char Diver_Name[80];
	Dive_Stats Dives[Num_Of_Dives];
	float Total_Score;
};


//==============================
//
// Function Prototypes
//
//==============================


void Input_Data(Diver_Info []);
void Calculate_Totals(Diver_Info []);
void Create_Report(Diver_Info []);
void Sort_Divers_Scores(Diver_Info []);
void Create_Output(Diver_Info []);



#endif

When I am compiling I get several errors that point to my two structures. The first error points to

float scores[Num_Of_Scores];

saying error C2057: expected constant expression. Does that make sense?? Confused | :confused:

Thanks for any tips.

Nick Parker

Chris Hambleton27-Aug-02 5:01

Chris Hambleton

27-Aug-02 5:01

Not sure, but why do you have 2 empty includes at the top with no headers specified?

C^hris L^osinger27-Aug-02 5:02

C^hris L^osinger

27-Aug-02 5:02

that's a problem with the CP boards, not Nick's code.

Aiei i ea eio aoa i e eio e aigoa

image effects!

Nick Parker27-Aug-02 5:07

27-Aug-02 5:07

Fixed.

Nick Parker

Tomasz Sowinski27-Aug-02 5:00

27-Aug-02 5:00

Is this C++ or plain C?

Tomasz Sowinski -- http://www.shooltz.com

Free your mind and your ass will follow.

Nick Parker27-Aug-02 5:13

27-Aug-02 5:13

I think I found the error, I was just trying to compile the .C files in VS, which caused it to flake out because of my syntax, thanks guys. Smile | :)

Nick Parker

Nick Parker27-Aug-02 5:04

27-Aug-02 5:04

C++ on a unix box, so he has asked us to use a .C extension. When I try this on VS and save my two .C files as .cpp I still get the same errors. The two structures themselves appear to be in the correct format, I have no idea why it is telling me that I need a constant expression there.

Nick Parker

Tomasz Sowinski27-Aug-02 5:08

27-Aug-02 5:08

So apparently the compiler decided it's a C program. In C you'll need to #define your constants. While language allows const modifier for variables, you can't use them as size of array (and, generally speaking, wherever you need a value known at compile time).

Tomasz Sowinski -- http://www.shooltz.com

Free your mind and your ass will follow.

markkuk27-Aug-02 5:41

markkuk

27-Aug-02 5:41

GCC 3.2 warns about the deprecated fstream.h header, but the structure declarations don't cause any errors.

Re: Choosing the best view?

Roger Allen27-Aug-02 6:11

Roger Allen

27-Aug-02 6:11

It could be that your version on the C/C++ compiler does not support the use of constants ints when declaring an array. It is valid C/C++ in the latest standard, but now all recent compilers currently support it. There is a way around this using what is known as the "enum hack"

enum {Num_of_scores = 7} ;

float scores[Num_of_scores] ;

Most, if not all compiler support this old method, where an enum can be used in the place an int is used.

Roger Allen
Sonork 100.10016

I think I need a new quote, I am on the prowl, so look out for a soft cute furry looking animal, which is really a Hippo in disguise. Its probably me.

Choosing the best view?

kc5zrs27-Aug-02 4:42

kc5zrs

27-Aug-02 4:42

Can anyone point me to a good source of comparison of the various views available in the MFC doc/view architecture? I'd like to know more about the pros and cons of using one view vs. another, and how one might go about choosing the best or most appropriate view for their application.

Thanks!

Tomasz Sowinski27-Aug-02 4:51

Figuring out someone else's program

27-Aug-02 4:51

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclib/html/_mfc_View_Classes_.28.Architecture.29.asp[^]

Tomasz Sowinski -- http://www.shooltz.com

Free your mind and your ass will follow.

Like2Byte27-Aug-02 4:14

Like2Byte

27-Aug-02 4:14

We all know how hard it is to figure out our own programs after it has been a while since we programed it. Now, the question is, how do you approach figuring out someone else's Windows program written in C++? Confused | :confused:

I already know that it's a win32 application (Well, honestly it's a WinCE platform) written with MFC (Functions tailored to fit CE).

Where should I begin to start learning how this software does what it does? At theApp? Just start reveiwing classes and put the pieces together later? Procedurally?

Thanks for your responses. Big Grin | :-D

Re: Figuring out someone else's program

Tomasz Sowinski27-Aug-02 4:20

Re: Figuring out someone else's program

27-Aug-02 4:20

If the program uses doc/view, then document and view classes will contain most interesting stuff. Does your project generate browse info? If not, make a copy and turn browse info generation on. You'll be able to easily look at class hierarchies.

Tomasz Sowinski -- http://www.shooltz.com

Free your mind and your ass will follow.

Like2Byte27-Aug-02 4:35

Like2Byte

27-Aug-02 4:35

Hey! That's really cool. Cool | :cool:

Is there any documentation on how to effectively use this browser?

{{Opens MSDN....}}

Thanks!

imus de buss
umis de buss
weall mis de buss

How to speed up from DDB to DIB?Emergency

csqlhy27-Aug-02 4:14

csqlhy

27-Aug-02 4:14

Dear,

I meet a problem to speed up the function from DDB to DIB.

The program I write is to read the wave data from the
data files, then output the wave drawing by BMP files.
And the BMP files may output 8bit, 16bits, 24bits,
32bits.

so, we design it as following,

1. From data file to draw wave
(not need display in screen, draw
draw in Memory DC is OK.
We need create a CBitmap, then use Memory DC
to draw in the CBitmap)

2. Then write them to bitmap files.

So, as you know, we should use GetDibits() function to transfer
from DDB to DIB. But I find that GetDibits() function use much
time, and it cause the reason of the bottleneck of my program.
Because I must speed up my program, I look for your help.

Can you tell me how to speed up the function from DDB to DIB?
Is any other function can substitute the GetDibits() function to
transfer from DDB to DIB?
Or our project design is too complicated, can use other
easy and fast method to complete?

Welcome any suggestion!

Best Regards,

Re: How to speed up from DDB to DIB?Emergency

Tomasz Sowinski27-Aug-02 4:18

Throwing an exception from a constructor

27-Aug-02 4:18

I think you should use CreateDIBSection and work on DIB exclusively. This gives you additional advantage of direct access to bitmap bits in device independent format - may be helpful if you need to push performance.

Tomasz Sowinski -- http://www.shooltz.com

Free your mind and your ass will follow.

Le centriste27-Aug-02 3:57

Le centriste

27-Aug-02 3:57

If an object throws an exception from a constructor, is it considered constructed?

Michel

It is a lovely language, but it takes a very long time to say anything in it, because we do not say anything in it, unless it is worth taking a very long time to say, and to listen to.

- TreeBeard

Re: Throwing an exception from a constructor

Tomasz Sowinski27-Aug-02 4:02