I need your suggestion for my following questions.
Recently i have buillt one standalone desktop software application and my question is ,
1. Application should be installed only one pc.
2. Once installed single PC it wont work/install otherPC/same PC next time.
3. We cannot used database for that application, also internet connection.
Not a C++ question, and you haven't provided enough information to answer the question without making a lot of assumptions.
So, assuming the platform is Windows, and that the PC is not connected to the internet:
1. Make a pre-install application that reports a unique ID for the PC. If you don't fancy rolling your own algorithm (not recommended), consider using the value found in the Registry at HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProductId which is probably unique and tied to an installation of Windows (see this StackOverflow discussion).
2. Once the user has run this application and reported the unique number, use it, with a secret key and a suitable hashing algorithm, to generate a unique hash tied to this ID. Deliver this hash to the user (in a letter, or email to other PC, or in a text message, or however you like).
3. In the installer, get the unique ID (by reading the Registry above), apply the hashing algorithm, ask the user for his or her hash, and compare the two. If they correspond, this is the correct PC, if not, abort the installation.
4. After installation is complete, Windows Installer will make a that this application has been installed. You can check this at the start of the installer to make sure it's not re-installed.
Basically, if you want to limit an application to be installed on only one PC, you need some way of identifying this single PC. If internet access isn't available, it can't be done during installation, so will need to be done in a two-step process.
Orjan Westin's suggestion of a unique key is probably the way to go, but you could also consider a hardware "dongle", e.g HASP, KeyLok, SecuTech etc.
The key can be shipped to the customer with the product media, or delivered separately when they request a license, and will ensure only one copy of the software is running per key supplied. Some dongle systems allow for upgrading, enabling additional features, and time-limited trial versions as well.
Days spent at sea are not deducted from one's alloted span - Phoenician proverb
I am have C++ files (.h, .cpp) that include functions to read a specify file type (.dgn). And I want to use these functions in C# for the same purpose . I am intending use "__declspec(dllexport)" to use C++ functions.
But, I don't know what type in C# is similar to "typedef void *" in C++.
Please see belows is C++ codes
/** Opaque handle representing DGN file, used with DGN API. */
typedef void *DGNHandle;
DGNHandle CPL_DLL DGNOpen( constchar *, int );
void CPL_DLL DGNSetOptions( DGNHandle, int );
int CPL_DLL DGNTestOpen( GByte *, int );
const DGNElementInfo CPL_DLL *DGNGetElementIndex( DGNHandle, int * );
I have one dialog box (parent). I have a button on this dialog box. On clicking this button I'll invoke second dialog (child) (modal dialog). Now I want to keep track of an instance in child dialog that it has been invoked second time. I mean to say when I click on the button, this dialog will be Poped Up. Now in any of the functions defined in the child dialog, I want to know that this dialog has been invoked second time and also I want to save the state of any variable defined in the child dialog. for example if I have set a variable as 1 in child dialog, Now when I invoked this dialog second time, I should get the variable's value as 1.
1. Store the information in static member variables in the child dialog.
2. Store the information in member variables of the parent dialog, pass it to the child dialog before calling DoModal() and retrieve the information when DoModal() returns.
3. Store the information in the registry below your application key. This is usefull when settings should be re-used when starting your app the next time. Information that is only used during the app execution time (e.g. the counter) should not be stored in the registry. But you may use a combination of registry with option 1. or 2.
Agree with some of other post, there is one more solutions, create a data class in your parent dialog class and pass as reference everytime the child dialog is invoked and all data modification should be done with the reference object, this way you will not have declare anything static and data would be at one place only!
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow Never mind - my own stupidity is the source of every "problem" - Mixture
You should keep a member variable(integer type)as static in parent dialog class. when button in parent dialog is clicked, this variable value just increment. i mean keep this variable as a counter. when this counter value is greater than one, pass this value to child dialog class. there should be checking for this counter value.
Note: in child dialog, you should use a configuration file(.INI) or text file for storing variable value.this file updated when closing the child dialog. if counter value is greater than 1, you should read this value from file and update variables.
I have an image of a form. I can easily add that image as a bitmap
resource. Then in my CFormView, I click on Toolbox and Picture Control and
I select Bitmap as the type and find the image from the list of images. I
can then lay edit boxes on top of the form.
The problem is, the form is just a black and white form and the bitmap takes
up alot of space. I have several form images to add and my program is becoming
really big in size. In contrast, a png or jpeg is alot smaller in size and the
final software will be smaller.
I can add a PNG as a resource. However, I click on Toolbox and add a Picture
Control and then right click on that Picture Control to go to its properties
and if I select Bitmap, it doesnt show the PNG as a image to select. How can
I use the PNG that is added?
Another question which is not crucial. How can I add a JPG as a resource? And
if I add it, how can I then use it?
If you can show me how to use a PNG or JPG or anything similar (not a GIF) and
how to make it display, that would be great.
If you can use GdiPlus library, Gdiplus::Bitmap can be used to load png and jpeg images.
You need to copy RGB data from jpg or png file to your picture control.
Please Note: GDI+ initialisation is required at startup of the application.
// Initialization of GDI+ library.
// GDI+ is used for loading images of different file format.
Gdiplus::GdiplusStartup(&m_gdiplusToken, &gdiplusStartupInput, NULL);
Gdiplus::Bitmap::FromStream() can be uised to create Bitmap from resource data.
It is my understanding that the first two parameters are passed in ECX and EDX, respectively, and the remaining parameters are pushed on the stack. The problem is that the return address appears to be pushed to the stack AFTER the third parameter. So with the code above, EAX is populated with the return address, and then I get a memory access error trying to read address 3.
The only way I have been able to get this to work, is to change my assembly to the following:
MOV EAX, [ESP]
MOV [ESP], EDX
Now my simple, one assembly instruction code tripled in complexity. My question: is there some way to force VS2010 to push the return address BEFORE the method parameters, so my first, single-instruction assembly method works as expected? Alternatively, it would also be acceptable if VS2010 took responsibility for pop-ing the third input parameter off the stack (currently, if I don't call POP exactly once, I get a stack corruption error when main exits). In either case, there must be a way to write this method using fastcall calling conventions such that it only takes a single assembly instruction. Thanks for any help!
On the page you quoted, it says "C and C++ function arguments are usually passed on the stack". This is if you are using the cdecl or stdcall calling conventions (all arguments are pushed to the stack, but they vary in who is responsible for clean-up). I am attempting to use the fastcall calling convention, where the first two parameters are passed in ECX and EDX, respectively, and all remaining parameters are pushed to the stack right-to-left. Confirmation of this can be found on MSDN[^]
When I actually run in the debugger, the stack pointer register (ESP) is pointing to the return value (pushed from EIP, the program execution pointer, after my third parameter is pushed), with [ESP + 4] (the second item in the stack) being my third parameter. When using fastcall, the callee is responsible for removing the parameters from the stack. However, I currently have to swap the two arguments on the stack (at addresses [ESP] and [ESP + 4]), otherwise I pop the return address off the stack, then try to return to address 3 when the RET statement executes.
This seems counter-intuitive to me. Why should I have to swap the stack arguments? Is there some other way to do this where I don't have to swap the arguments?
If you create a dummy function in C with the __fastcall attribute and compile it with the /FAs compiler options, you can see how the C compiler generates the code for such a call. If you ignore the fact that the C generated code moves the parameters around quite a bit, you can see that it does not pop the arguments off the stack, but addresses them directly by their offset relative to the stack pointer. It then clears the pushed arguments by using the ret N return command.
One of these days I'm going to think of a really clever signature.
This may be a wrong place to post this request,my apology.
I am currently using a USB dongle called LittleWire as a control interface to I2C device.
I am trying to learn how to build libraries and so far I pretty much stuck with morass of header files.
I can build simple Static library ( in VC ) , but it appears that “outside MS” developers rely heavily on variety of Make /Cmake tools.
My obviously obsolete programming book "Inside Visual C++” does not cover Make.
I have never used VC Make wizard and would like to learn how to do that.
I would greatly appreciate any personall recomendations, links/ references, on “ using Make”.
( Yes I can Google, I am looking for a real experience recomendation )
Thanks for your time.
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