Actually, on 32-bit computers a word is 32-bit, but the DWORD type is a leftover from the good old days of 16-bit.

In order to make it easier to port programs to the newer system, Microsoft has decided all the old types will not change size.

You can find the official list here:
http://msdn.microsoft.com/en-us/library/aa383751(VS.85).aspx

All the platform-dependent types that changed with the transition from 32-bit to 64-bit end with _PTR (DWORD_PTR will be 32-bit on 32-bit Windows and 64-bit on 64-bit Windows).


It is defined as:

    typedef unsigned long       DWORD;

However, according to the MSDN:

&gt; On 32-bit platforms, long is
&gt; synonymous with int.

Therefore, DWORD is 32bit on a 32bit operating system. There is a separate define for a 64bit DWORD:

    typdef unsigned _int64 DWORD64;

Hope that helps.

No ... on all Windows platforms DWORD is 32 bits. LONGLONG or LONG64 is used for 64 bit types.

What code do you need to add in PHP to automatically have the browser download a file to the local machine when a link is visited?

I am specifically thinking of functionality similar to that of download sites that prompt the user to save a file to disk once you click on the name of the software?

How to Automatically Start a Download in PHP?

This query works great:

    var pageObject = (from op in db.ObjectPermissions
                      join pg in db.Pages on op.ObjectPermissionName equals page.PageName
                      where pg.PageID == page.PageID
                      select op)
                     .SingleOrDefault();


I get a new type with my &#39;op&#39; fields.  Now I want to retrieve my &#39;pg&#39; fields as well, but

    select op, pg).SingleOrDefault();

doesn&#39;t work.

How can I select everything from both tables so that they appear in my new pageObject type?

Creating a LINQ select from multiple tables

In Visual C++ a DWORD is just an unsigned long that is machine, platform, and SDK dependent.  However, since DWORD is a double word (that is 2 * 16), is a DWORD still 32-bit on 64-bit architectures?



How large is a DWORD with 32- and 64-bit code?

<p>In Visual C++ a DWORD is just an unsigned long that is machine, platform, and SDK dependent.  However, since DWORD is a double word (that is 2 * 16), is a DWORD still 32-bit on 64-bit architectures?</p>


I was looking at the API documentation for stl vector, and noticed there was no method on the vector class that allowed the removal of an element with a certain value. This seems like a common operation, and it seems odd that there&#39;s no built in way to do this.

How do I remove an item from a stl vector with a certain value?

I&#39;d like to be able to introspect a C++ class for its name, contents (i.e. members and their types) etc. I&#39;m talking native C++ here, not managed C++, which has reflection. I realise C++ supplies some limited information using RTTI. Which additional libraries (or other techniques) could supply this information?



How can I add reflection to a C++ application?

I come from a Java background, where packages are used, not namespaces. I&#39;m used to putting classes that work together to form a complete object into packages, and then reusing them later from that package. But now I&#39;m working in C++.

How do you use namespaces in C++? Do you create a single namespace for the entire application, or do you create namespaces for the major components? If so, how do you create objects from classes in other namespaces?

How do you properly use namespaces in C++?

Any good suggestions? Input will be the name of a header file and output should be a list (preferably a tree) of all files including it directly or indirectly.

Tool to track #include dependencies

Looking for an example that:

 1. Launches an EXE
 2. Waits for the EXE to finish.
 3. Properly closes all the handles when the executable finishes.

How do I call ::CreateProcess in c++ to launch a Windows executable?

What would be the best way to write Objective-C on the Windows platform?

Cygwin and gcc? Is there a way I can somehow integrate this into Visual Studio?

Along those lines - are there any suggestions as to how to link in and use the Windows SDK for something like this. Its a different beast but I know I can write assembly and link in the Windows DLLs giving me accessibility to those calls but I don&#39;t know how to do this without googling and getting piecemeal directions.

Is anyone aware of a good online or book resource to do or explain these kinds of things?

Objective-C for Windows

On Windows I have a problem I never encountered on Unix. That is how to get a thread to sleep for less than one millisecond. On Unix you typically have a number of choices (sleep, usleep and nanosleep) to fit your needs. On Windows, however, there is only *Sleep* with millisecond granularity. 

On Unix, I can use the use the `select` system call to create a microsecond sleep which is pretty straightforward:

    int usleep(long usec)
    {
        struct timeval tv;
        tv.tv_sec = usec/1000000L;
        tv.tv_usec = usec%1000000L;
        return select(0, 0, 0, 0, &amp;tv);
    }

How can I achieve the same on Windows?


How to make thread sleep less than a millisecond on Windows

I need to write a function that generates an id that is unique for a given machine running a Windows OS.

Currently, I&#39;m using WMI to query various hardware parameters and concatenate them together and hash them to derive the unique id. My question is, what are the suggested parameters I should use? 
Currently, I&#39;m using a combination of bios\cpu\disk data to generate the unique id. And am using the first result if multiple results are there for each metric.

However, I ran into an issue where a machine that dual boots into 2 different Windows OS generates different site codes on each OS, which should ideally not happen.

For reference, these are the metrics I&#39;m currently using:

    Win32_Processor:UniqueID,ProcessorID,Name,Manufacturer,MaxClockSpeed
    Win32_BIOS:Manufacturer
    Win32_BIOS:SMBIOSBIOSVersion,IdentificationCode,SerialNumber,ReleaseDate,Version
    Win32_DiskDrive:Model, Manufacturer, Signature, TotalHeads
    Win32_BaseBoard:Model, Manufacturer, Name, SerialNumber
    Win32_VideoController:DriverVersion, Name

Generating a unique machine id

How exactly do DLL files work? There seems to be an awful lot of them, but I don&#39;t know what they are or how they work.

So, what&#39;s the deal with them?


What exactly are DLL files, and how do they work?

Can I run a 64-bit VMware image on a 32-bit machine?

I&#39;ve googled this, but there doesn&#39;t seem to be a conclusive answer.

I know that it would have to be completely emulated and would run like a dog - but slow performance isn&#39;t necessarily an issue as I&#39;m just interested in testing some of my background services code on 64-bit platforms.


Can I run a 64-bit VMware image on a 32-bit machine?

We have two versions of a managed C++ assembly, one for x86 and one for x64.  This assembly is called by a .net application complied for AnyCPU.  We are deploying our code via a file copy install, and would like to continue to do so.

Is it possible to use a Side-by-Side assembly manifest to loading a x86 or x64 assembly respectively when an application is dynamically selecting it&#39;s processor architecture?  Or is there another way to get this done in a file copy deployment (e.g. not using the GAC)?


Using Side-by-Side assemblies to load the x64 or x32 version of a DLL

I have an application that we&#39;re trying to migrate to 64bit from 32bit.  It&#39;s .NET, compiled using the x64 flags.  However, we have a large number of DLLs written in FORTRAN 90 compiled for 32bit.  The functions in the FORTRAN DLLs are fairly simple:  you put data in, you pull data out; no state of any sort.  We also don&#39;t spend a lot of time there, a total of maybe 3%, but the calculation logic it performs is invaluable.

Can I somehow call the 32bit DLLs from 64bit code?  MSDN suggests that I can&#39;t, period.  I&#39;ve done some simple hacking and verified this.  Everything throws an invalid entry point exception.  The only possible solution i&#39;ve found so far is to create COM+ wrappers for all of the 32bit DLL functions and invoke COM from the 64bit process.  This seems like quite a headache.  We can also run the process in WoW emulation, but then the memory ceiling wouldn&#39;t be increased, capping at around 1.6gb.

Is there any other way to call the 32bit DLLs from a 64bit CLR process?

Calling 32bit Code from 64bit Process

I have a little dilemma on how to set up my visual studio builds for multi-targeting.

Background: c# .NET v2.0 with p/invoking into 3rd party 32 bit DLL&#39;s, SQL compact v3.5 SP1, with a Setup project. 
Right now, the platform target is set to x86 so it can be run on Windows x64.

The 3rd party company has just released 64 bit versions of their DLL&#39;s and I want to build a dedicated 64bit program.

This raises some questions which I haven&#39;t got the answers to yet.
I want to have the exact same code base.
I must build with references to either the 32bit set of DLL&#39;s or 64bit DLL&#39;s.
(Both 3rd party and SQL Server Compact)

Can this be solved with 2 new sets of configurations (Debug64 and Release64) ?

Must I create 2 separate setup projects(std. visual studio projects, no Wix or any other utility), or can this be solved within the same .msi?

Any ideas and/or recommendations would be welcomed.



Targeting both 32bit and 64bit with Visual Studio in same solution/project

I am trying to adapt an existing code to a 64 bit machine. The main problem is that in one function, the previous coder uses a void* argument that is converted into suitable type in the function itself. A short example:

    void function(MESSAGE_ID id, void* param)
    {
        if(id == FOO) {
            int real_param = (int)param;
            // ...
        }
    }

Of course, on a 64 bit machine, I get the error:

    error: cast from &#39;void*&#39; to &#39;int&#39; loses precision

I would like to correct this so that it still works on a 32 bit machine and as cleanly as possible. Any idea ?


Converting a pointer into an integer

Could someone explain what this means? (Intel Syntax, x86, Windows)

    and     dword ptr [ebp-4], 0

What does `dword ptr` mean?

I&#39;m not afraid to admit that I&#39;m somewhat of a C++ newbie, so this might seem like a silly question but....

I see DWORD used all over the place in code examples. When I look up what a DWORD truly means, its apparently just an unsigned int (0 to 4,294,967,295). So my question then is, why do we have DWORD? What does it give us that the integral type &#39;unsigned int&#39; does not? Does it have something to do with portability and machine differences?

Content Type	Original Author	Original Content on Stackoverflow
Question	Haim Bender	View Question on Stackoverflow
Solution 1 - C++	Nir	View Answer on Stackoverflow
Solution 2 - C++	Mark Ingram	View Answer on Stackoverflow
Solution 3 - C++	Rob Walker	View Answer on Stackoverflow

How large is a DWORD with 32- and 64-bit code?

C++ Problem Overview

C++ Solutions

Solution 1 - C++

Solution 2 - C++

Solution 3 - C++

Creating a LINQ select from multiple tables

How to Automatically Start a Download in PHP?

Attributions