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Hello:
My application (C++ / MFC) uses the the microsoft Jet engine and the DAO classes to read and write microsoft access files.
Under Windows-7 the Jet engine is not available (except in XPMode).
Is there a quick and easy way to allow my application to continue reading and writing access files without the use of the microsoft jet engine? Do I need to remove the DAO classes and completely rewrite this part of the application?
Thanks
BobVal
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Hi,
Im looking for a bit of guidance on this. I have a project for college for network design. It is to implement a C program for the breadth first search algorithm.
I can program in c but this is really confusing me, iv seen examples but they are hard to follow. Please see the brief below. Just need a push in the right direction to get started not the whole thing thanks.
BRIEF:
Implement Moores + Breadth First Search algorithm
-Input a list of edges in the format
{A, B}
-Where A, B are integers.
-The application should return
* Shortest path between a pair of user selected nodes.
* A spanning tree for the network.
Estimate the performance of the algorithm as a function of no of edges in the input list.
(I.e. time no of top level operations, memory usage etc)
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I agree that the web is a good source of information on this issue. For example, you could look at the following URL: http://en.wikipedia.org/wiki/Dijkstra's_algorithm
There are several text books that discuses this issue as well. One book that comes to mind is "Introduction to Algorithms" by Cormen, Leiserson, Rivest and Stein. This book is not particular easy to follow but it does a very good job of analyzing the running time of the algorithms it discuses.
Bob
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Hi everyone i'm stuck again on my program. I got to be honest to I feel like and idiot asking for help on something that I bet is so simple to most of you, anyway I have posted my code below. I was hoping someone could tell me why it does not compile.
#include<stdio.h>;
const float lowrate=2;
const float highrate=5;
const float taxrate=20;
int balance,threshold,total,interest,tax;
main()
{
printf("\n\n\t\tInput account balance ");
scanf("%d",&balance);
if (balance<threshold)
interest=balance*lowrate/100;
else
interest=balance*highrate/100;
total=balance+interest;
if tax is Y
tax=interest*taxrate/100;
total=total-tax;
getchar();
printf("\n\n\t\tInterest rate %20d", taxrate);
printf("\n\n\t\tInterest added %20d",interest);
printf("\n\n\t\tTax deducted %20d", tax);
printf("\n\n\t\tTotal account balance %17d",total);
getchar();
}
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Please read the posting guidelines at the top of this forum before posting (use the code tag when submiting code and use a relevant title). Also, putting the error messages you get is helps a lot (thery are there for a reason you know).
Anyway, this line is invalid:
Ev3nflow wrote: if tax is Y
There is no "is" keyword in C++ and you forgot the paranthesis. Furthermore, Y has never been declared before.
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Hi thanks for your help I dont mean to come across as such an amature I just want to get my work done cheers
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Ev3nflow wrote: main()
int main()
Ev3nflow wrote: if tax is Y
is this supposed to be a comment (hopefully it is)? add "//" in front of it.
Also, you should get in the habit of initializing variables after you declare them, it looks as though you're using 'threshold' without it being initialized. When posting code please use code tags.
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Ev3nflow wrote: printf("\n\n\t\tInterest rate %20d", taxrate);
printf("\n\n\t\tInterest added %20d",interest);
printf("\n\n\t\tTax deducted %20d", tax);
Why are you not using the %f format specifier?
"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
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Well, he did define interest and tax to be int. Why? I don't know. 
You measure democracy by the freedom it gives its dissidents, not the freedom it gives its assimilated conformists.
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Ev3nflow wrote: #include;
The include statement needs a filename to include, such as:
#include "file1.h"
or
#include <file2.h>
[modified]
Nevermind, I see what happened to the filename. The HTML gods ate it. 
You measure democracy by the freedom it gives its dissidents, not the freedom it gives its assimilated conformists.
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Hi thanks to all who have help me. I have changed my code, and it seems to compile but I still get a warning 14 [Warning] converting to `int' from `float' I have pasted my code below
#include <stdio.h>;
const float lowrate=2;
const float highrate=5;
const float taxrate=20;
int balance,threshold,total,interest,tax,taxed,Y,is;
main()
{
printf("\n\n\t\tInput account balance ");
scanf("%d",&balance);
if (balance<threshold)
interest=balance*lowrate/100;
else
interest=balance*highrate/100;
total=balance+interest;
if (taxed) is; 'Y';
tax=interest*taxrate/100;
total=total-tax;
getchar();
printf("\n\n\t\tInterest rate %20d", taxrate);
printf("\n\n\t\tInterest added %20d",interest);
printf("\n\n\t\tTax deducted %20d", tax);
printf("\n\n\t\tTotal account balance %17d",total);
getchar();
}
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It does not appear that you have changed anything.
Ev3nflow wrote: #include ;
 We know what it is, but still.
Ev3nflow wrote: if (balance < threshold)
threshold has not been initilized.
Ev3nflow wrote: interest=balance*lowrate/100;
I would suggest using 100.0 instead.
Ev3nflow wrote: if (taxed) is; 'Y';
This does not compile.
Ev3nflow wrote: printf("\n\n\t\tInterest rate %20d", taxrate);
printf("\n\n\t\tInterest added %20d",interest);
printf("\n\n\t\tTax deducted %20d", tax);
You are still using %d.
To make your code easier to read, highlight it all and click the "code block" button. Then click the "Preview" button to make sure it looks like something others can decipher.
"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
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Hi all,
I am using MFC dialog application and I have some global variables.
I am struggling with where and how I can declare an external function to make initialization for external or global variables and this function should bring the values from DB to store them in those global variables.
I tried to put the desired code without include them inside function structure after the ProjectNameApp theApp in the ProjectName.cpp// but failed
I tried to put the function declaration as a member function in the ProjectNameApp class and call it after the ProjectNameApp theApp in the ProjectName.cpp //but failed as well
I tried to put the function declaration as a member function in the ZZ.cpp and made the proper including //but failed and inform me that you can't initialize them into closed scope.
it seems to me that the initialization should be in the test.cpp and without function using. I don't believe that but how I can make it.
Please any one can help me?
Any help will be appreciated
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Personally I usually put all variables that would be global into the Application class instead. So initialization of global variables would be either in InitInstance or in the application's constructor. But that's me.
But I think that the same idea would apply: initialize the globals using the application's constructor, or in InitInstance. That way it's out of the way before you access the variables later in the program.
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class CYourApp : public CWinApp
{
....
public:
float m_Yourvariable;
public:
void YourFunction();
...
}
In the ZZ.cpp file:
extern CYourApp theApp
access your global variable ---> theApp.m_Yourvariable;
access your global function ---> theApp.YourFunction();
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Global variables must be defined in a .cpp file. You may initialize them wherever you want.
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]
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Thank you for all of you.
Anyway Itried to make initialization in Initinstance and the project's constructor but its not working always give me an unresolved variable.
Its work fine when Iam access my variables and functions via theApp, but I should include the "ProjectName.h" in each function i want to use the variable there not like the extern int x(for example). So I am not sure if these variables will reserved its values during the cycle of system.
anyway I will test it. and thank you again for all of you.
Regards,
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Thank you for all of you.
Anyway Itried to make initialization in Initinstance and the project's constructor but its not working always give me an unresolved variable.
Its work fine when Iam access my variables and functions via theApp, but I should include the "ProjectName.h" in each function i want to use the variable there not like the extern int x(for example). So I am not sure if these variables will reserved its values during the cycle of system.
anyway I will test it. and thank you again for all of you.
Regards,
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I know that there's a method,
C++
UINT MsiInstallProduct(
__in LPCTSTR szPackagePath,
__in LPCTSTR szCommandLine
);
However, it needs a package path, how can i get it by product code?
Thanks!
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when I updating excel file using odbc driver I got the following exceptions frequently When I click on any cell
Key violation.
[Microsoft][ODBC Excel Driver] The connection for viewing your linked Microsoft Excel worksheet was lost.
Key violation.
[Microsoft][ODBC Excel Driver] The Microsoft Jet database engine cannot open the file '(unknown)'. It is already opened
General SQL error.
exclusively by another user, or you need permission to view its data.
how can I prevent to avoid these exceptions
Trioum
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You can run your program under the debugger to understand the nature of these exceptions and then fix your code.
“Follow your bliss.” – Joseph Campbell
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How Can I fix the following error
Trioum
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Debug it. I won't be replying any further on this thread.
“Follow your bliss.” – Joseph Campbell
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in the name of god
hello
when we declare a variable in c++ as :
int x;
int x1=98;
then initialize it with a value.
how we can know that a variable has been initialized or no?is there any way (compiler can or ...)to distinguish between initialized variable and non-ini...
that we dont know the value of them.
valhamdolelah.
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