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I had this problem a few years back as well. The problem is that the MFC classes
uses DAO 3.5 to open the Access databases. Access 2000 and above however is
incompatible with 3.5.
There is a workaround on the Microsoft Knowledgebase. Have a look at:
http://support.microsoft.com/default.aspx?kbid=236991[^]
Maybe now's a good time to switch to ADO for database access.
I Dream of Absolute Zero
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How do you create menus in VC++ dialog based MFC application?
Provide a sample code for it.
Karteek
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Your dialog object will need a CMenu member variable. In the dialog's OnInitDialog() method, simply call that variable's LoadMenu() method followed by CDialog::SetMenu() . It's that easy!
Five birds are sitting on a fence.
Three of them decide to fly off.
How many are left?
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Hi,
I'm using
RECT r;
GetClientRect(hWnd,&r);
CreateWindow(WC_EDIT,etc,etc,r.right,r.bottom....);
to get the client area of my window and putting an edit control in there which should fit precisely. I noticed that the returned value for the first window created by the application is wrong. The height is 10 pixels short(about the same height as a titlebar).
When used with any subsequently created windows the value is correct. Does anybody know what this is about? Maybe a bug?
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I have found that when I want to have things sized perfectly in a client that I also need to process the WM_SIZE message to maintain proper sizing of the child.
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Anyone know why VC++7 completely craps out when you change the name of the class or the .cpp or the .h files to be created in the MFC ODBC Consumer Wizard? Am I the only one with this problem? The OBDC driver is MySQL 3.51.
Matt (Padawan Learner)
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Perhaps GetAdaptersInfo would help?
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I just wanted to make it clear that i have heard that it is possible to have global memory in windows 95,97 which could be shared by all. What i mean by shared memory is that some new operator works on global memory.
I need exact details that how to have memory which i allocate from any process is shared between all the processes.
I need the api or is it ka any new operation allocate memory on the global level not private memory as windows nt has private address space for each process and pointer in one process is invalid in another.
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Please help
Here is my code. I was able to modified to go to main menu.
But If user enter a value outside the range it should not
go to the main menu. It should display only:
cout<<"Please enter 1 or 2 (3 to exit program):";
cin>>choice;
#include <iostream.h>
//using namespace std;
int main(void)
{
int choice;
float c; //Declare variable to be displayed.
float f;
//Question:Will it be the best practice to do
this: float c=0?
//Question:I used float, but I am not sure if in
this case better to use int or double?
for(;;)
// empty to promt a user to enter correct
choice value
{
cout<<"Please select the task to
perform:"<<endl;
cout<<"convert="" fahrenheit="" to=""
centigrade="" (1)"<<="" endl;
="" centigrade=""
fahrenheit(2)"<<="" cout<<"exit="" the="" program(3)"<<=""
="" do
="" use="" do-while="" loop
="" {
="" cout<<"please="" enter="" 1="" or="" 2="" (3="" exit=""
program):";
="" cin="">>choice;
switch (choice)
{
// use switch in order to do
validation and calculation
case 1:
{
cout<<"Enter value
in Fahrenheit:" ;
cin>>f;
c=((f-32)*5/9);
cout<<"The value
in Centigrade is:"<<c<<endl;
}
="" break;
="" case="" 2:
="" {
="" cout<<"enter="" value=""
in="" centigrade:";
="" cin="">>c;
f=((c+32)*9/5);
cout<<"The value
in Fahrenheit is:"<
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You could create another function to handle the switching.. I would make that function of type BOOL and if they enter a invalid response then you could return false and prompt the user again with the same question...
Rob
Whoever said nothing's impossible never tried slamming a revolving door!
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can you give the example? I am new to C++
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I didn't compile this so it may have errors.. At least I think you will get the basic idea...
BOOL OnPrompt();
int main(void)
{
cout<<"Please select the task to perform:"<<endl;
cout<<"Convert Fahrenheit to Centigrade (1)"<< endl;
cout<<"Convert Centigrade to Fahrenheit(2)"<< endl;
cout<<"Exit the program(3)"<< endl;
while(true)
{
if(OnPrompt())
break;
}
return 0;
}
BOOL OnPrompt()
{
int choice;
float c;
float f;
cout<<"Please enter 1 or 2 (3 to exit program):";
cin>>choice;
switch (choice)
{
case 1:
{
cout<<"Enter value
in Fahrenheit:" ;
cin>>f;
c=((f-32)*5/9);
cout<<"The value
in Centigrade is:"<<c<<endl;
return TRUE;
break;
}
case 2:
{
cout<<"Enter value in Centigrade:";
cin>>c;
f=((c+32)*9/5);
cout<<"The value in Fahrenheit is:"<<f<<endl;
return TRUE;
break;
}
case 3:
{
cout<<"Thank you for using this program."<<endl;
return TRUE;
break;
}
default:
{
cout<<"Incorrect input"<< endl;
return FALSE;
}
}
}
Rob
Whoever said nothing's impossible never tried slamming a revolving door!
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I am so sorry. But I could not compile your example.
And also I did not understand
Please explain one more time...
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For brevity, Rob left out some of the basics. It was assumed you knew how to add the missing pieces. Work through the compiler/linker errors one by one until you encounter one that you just cannot figure out.
Five birds are sitting on a fence.
Three of them decide to fly off.
How many are left?
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DavidCrow wrote:
Five birds are sitting on a fence.
Three of them decide to fly off.
How many are left?
I would love to guess "two", but since that's just *way* too easy, I'm gonna go with "a number".
The kindest thing you can do for a stupid person, and for the gene pool, is to let him expire of his own dumb choices.
[Roger Wright on stupid people]
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DavidCrow wrote:
Five birds are sitting on a fence.
Three of them decide to fly off.
How many are left?
None - if one bird takes off, so does the whole flock.
Who is 'General Failure'? And why is he reading my harddisk?!?
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Your while loop is definitely testing the wrong thing. Or is there a typo?
You probably need to drop the useless for( ;; ) -loop and switch to a while-loop testing for (choice == 3) as exit-condition.
You obviously need to get the input for choice before this loop.
As last statements in this loop (after the switch block), you need to duplicate the input for choice.
That way, you will be asking for choice in any subsequent loops.
The switch-statement will then have cases only for 1, 2, and default.
Be careful what entering a letter into your float variable does!
An additional hint:
do
{ seems to be a very silly comentary. Everyone can see this.
Try not to comment what you do, but why and why exactly so and not different.
Who is 'General Failure'? And why is he reading my harddisk?!?
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Here is my modified code. It still not going to the cout<<"Please select the task to perform:"<<endl;if user="" entered=""
value="" outside="" the="" range="" 1="" or="" 2.="" i="" dot="" need="" to="" show="" main="" menu
#include="" <iostream.h="">
//using namespace std;
int main(void)
{
int choice;
float c;
float f;
bool enter;
do
{
if (enter=true )
{
cout<<"Please select the task to perform:"<<endl;
cout<<"convert="" fahrenheit="" to="" centigrade="" (1)"<<="" endl;
="" fahrenheit(2)"<<="" cout<<"exit="" the="" program(3)"<<="" cout<<"please="" enter="" 1="" or="" 2="" (3="" exit="" program):";
="" }
="" else=""
="" {
=""
="" cin="">>choice;
switch (choice)
{
case 1:
{
cout<<"Enter value in Fahrenheit:" ;
cin>>f;
c=((f-32)*5/9);
cout<<"The value in Centigrade is:"<<c<<endl;
enter="=true;
" }
="" break;
="" case="" 2:
="" {
="" cout<<"enter="" value="" in="" centigrade:";
="" cin="">>c;
f=((c+32)*9/5);
cout<<"The value in Fahrenheit is:"<
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Here is my updated code, but it is not doing what it should.
If user enters outside the range 1,2 it should show only cout<<"Please enter 1 or 2 (3 to exit program):"; in all other cases main menu
#include <iostream.h>
//using namespace std;
int main(void)
{
int choice;
float c;
float f;
bool enter;
enter==true;
do
{
if (enter=true )
{
cout<<"Please select the task to perform:"<<endl;
cout<<"convert="" fahrenheit="" to="" centigrade="" (1)"<<="" endl;
="" fahrenheit(2)"<<="" cout<<"exit="" the="" program(3)"<<="" cout<<"please="" enter="" 1="" or="" 2="" (3="" exit="" program):";
="" }
="" else=""
="" {
="" cin="">>choice;
switch (choice)
{
case 1:
{
cout<<"Enter value in Fahrenheit:" ;
cin>>f;
c=((f-32)*5/9);
cout<<"The value in Centigrade is:"<<c<<endl;
enter="=true;
" }
="" break;
="" case="" 2:
="" {
="" cout<<"enter="" value="" in="" centigrade:";
="" cin="">>c;
f=((c+32)*9/5);
cout<<"The value in Fahrenheit is:"<
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sardinka wrote:
if (enter=true )
The compiler could have easily detected this error had it been written like:
if (true=enter)...
It's always good practice to place constants on the left of the operator and variables on the right of the operator. That way, if you ever decice to use = instead of ==, you'll receive a compiler error.
Five birds are sitting on a fence.
Three of them decide to fly off.
How many are left?
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I am creating a simple drawing application to draw lines.Also fill an enclosed space with color.After i draw the lines to get an enclosed space i use the right mouse button up to fill it with black color. again when i right click it, it should become white. i am not able to get that part. can you help me??
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When I want to see Call Graph on
DevPartner 7.1 for C++,
of some of enlisted method in performance session,
they shows rectanle with pluses for traversing tree,
but when I press on this pluses
The
"Format Exception: Wasi not in a correct format".
What to do to find place in my code where it happen?
How to see MFC or ATL code where it nearest happen?
thanks you.
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cout<<"Please enter 1 or 2 (3 to exit program):";
cin>>choice;
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1
Whoever said nothing's impossible never tried slamming a revolving door!
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