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UpdateResource

, 7 Sep 2003
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How to manipulate raw resources (RT_RCDATA) using UpdateResource().

Introduction

Over the years, I've seen various flavors of the question "How do I include a file or data with my program that I can extract at run-time and do something with it?" For example, the asker might have had a .WAV file or a .MDB (MS Access) file that s/he wanted to include in the actual executable itself. For one reason or another, they do not want to package the two files separately. One advantage this has over a separate data/configuration file is that it'll never get lost. If the user decides they want to start fresh, they can remove everything but the application itself, and when the application is started up again, it extracts an empty database, all without the user knowing the behind-the-scenes details.

So thre are really two questions on the table here: "How to include the file?" and "Once the file is included, how to extract it and 'use' it?" Let's look at a simple example.

Including the file

In this example, I'll show the necessary code to take the entire Windows calculator (calc.exe) and add it as a resource to some test .EXE. The .EXE could just as easily be the application where these code snippets reside. The first thing we must do is open calc.exe in read-only mode, and read the entire file into a buffer.

HANDLE hFile;
DWORD dwFileSize,      
      dwBytesRead;
LPBYTE lpBuffer;

hFile = CreateFile(L"C:\\Winnt\\System32\\calc.exe", GENERIC_READ, 
                   0,
                   NULL,
                   OPEN_EXISTING,
                   FILE_ATTRIBUTE_NORMAL,
                   NULL);

if (INVALID_HANDLE_VALUE != hFile)
{
    dwFileSize = GetFileSize(hFile, NULL);

    lpBuffer = new BYTE[dwFileSize];

    if (ReadFile(hFile, lpBuffer, dwFileSize, &dwBytesRead, NULL) != FALSE)
    {
        // do something with lpBuffer here
    }

    delete [] lpBuffer;        
    
    CloseHandle(hFile);
}

Updating the resource data

Now it's simply a matter of getting access to the resource data of the test file and updating it with the data pointed to by lpBuffer. The third parameter to UpdateResource() is the name we want to give the resource. I just chose an arbitrary name of 104.

HANDLE hResource;

hResource = BeginUpdateResource(L"C:\\...\\t3.exe", FALSE);
if (NULL != hResource)
{
    if (UpdateResource(hResource, 
        RT_RCDATA, 
        MAKEINTRESOURCE(104), 
        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), 
        (LPVOID) lpBuffer, 
        dwFileSize) != FALSE)
    {
        EndUpdateResource(hResource, FALSE);
    }
}

At this point, you can actually open the test file with Visual Studio and see the addition of our data in the "Data" section. Be sure to open the file as a "resource"!

Extracting the data

So now your application has been delivered, and you need to extract the resource data.

Extracting the resource data uses functions from the same family as UpdateResource(). The required steps are to load the file containing the resource data, find the desired resource, load the resource, and then lock it.

HMODULE hLibrary;
HRSRC hResource;
HGLOBAL hResourceLoaded;
LPBYTE lpBuffer;

hLibrary = LoadLibrary(L"C:\\...\\t3.exe");
if (NULL != hLibrary)
{
    hResource = FindResource(hLibrary, MAKEINTRESOURCE(104), RT_RCDATA);
    if (NULL != hResource)
    {
        hResourceLoaded = LoadResource(hLibrary, hResource);
        if (NULL != hResourceLoaded)        
        {
            lpBuffer = (LPBYTE) LockResource(hResourceLoaded);            
            if (NULL != lpBuffer)            
            {                
                // do something with lpBuffer here            
            }
        }    
    }

    FreeLibrary(hLibrary);
}

Saving the data to a file

All that's left is to create a file with the data pointed to by lpBuffer. Nothing special needs to be done to the data. It's the entire Windows calculator!

DWORD dwFileSize,
      dwBytesWritten;
HANDLE hFile;

dwFileSize = SizeofResource(hLibrary, hResource);

hFile = CreateFile(L"C:\\Winnt\\Temp\\calc2.exe",
                   GENERIC_WRITE,
                   0,
                   NULL,
                   CREATE_ALWAYS,
                   FILE_ATTRIBUTE_NORMAL,
                   NULL);

if (INVALID_HANDLE_VALUE != hFile)
{
    WriteFile(hFile, lpBuffer, dwFileSize, &dwBytesWritten, NULL);

    CloseHandle(hFile);
}

Now you should be able to run the newly created file, calc2.exe! As I indicated at the beginning of the article, this can be done with any sort of file that you want to include along with your main application or DLL.

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

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About the Author

DavidCrow
Software Developer (Senior) Pinnacle Business Systems
United States United States

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Comments and Discussions

 
GeneralCursor Resource Pinmembernenfa23-Jul-10 4:57 
AnswerRe: Cursor Resource PinmvpDavidCrow23-Jul-10 5:51 
GeneralRe: Cursor Resource Pinmembernenfa26-Jul-10 23:52 
QuestionRe: Cursor Resource PinmvpDavidCrow27-Jul-10 3:56 
GeneralBITMAP Pinmemberfilipe_madureira29-May-09 6:27 
GeneralRe: BITMAP PinmvpDavidCrow29-May-09 11:49 
GeneralRe: BITMAP Pinmemberfilipe_madureira1-Jun-09 23:31 
QuestionIs it possible to execute the data? Pinmemberflaushi20-Mar-09 3:30 
AnswerRe: Is it possible to execute the data? PinmvpDavidCrow20-Mar-09 3:47 
GeneralRe: Is it possible to execute the data? Pinmembermarc ochsenmeier6-Jul-10 3:01 
QuestionRe: Is it possible to execute the data? PinmvpDavidCrow6-Jul-10 4:29 
AnswerRe: Is it possible to execute the data? Pinmembermarc ochsenmeier6-Jul-10 4:39 
GeneralThe article helped a lot Pinmemberadenissov18-Nov-08 13:30 
AnswerA way for updating application ICON (from .ICO file) PinmemberElad raz15-Oct-08 7:35 
QuestionRe: A way for updating application ICON (from .ICO file) PinmvpDavidCrow15-Oct-08 7:42 
Elad raz wrote:
As mentioned before...

 
Is this in response to ArnorBld?
 

"Love people and use things, not love things and use people." - Unknown

"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch


AnswerRe: A way for updating application ICON (from .ICO file) PinmemberElad raz15-Oct-08 7:48 
GeneralRe: A way for updating application ICON (from .ICO file) PinmvpDavidCrow15-Oct-08 7:55 
GeneralBe sure to apply your checks.. PinmemberChizI2-May-08 6:47 
GeneralRe: Be sure to apply your checks.. PinmvpDavidCrow2-May-08 6:53 
QuestionIcon resources PinmemberArnorBld11-Dec-06 21:13 
AnswerRe: Icon resources PinmemberDavidCrow13-Dec-06 5:19 
GeneralRe: Icon resources PinmemberArnorBld14-Dec-06 8:05 
GeneralJust cant get any better PinmemberRajesh R. Subramanian28-Jun-06 2:14 
GeneralRe: Just cant get any better PinmemberDavidCrow28-Jun-06 3:28 
GeneralUpdateResource RT_ICON PinmemberCG2i0331-May-06 4:13 
GeneralRe: UpdateResource RT_ICON PinmemberDavidCrow31-May-06 5:28 
QuestionUpdate Resource within yourself? PinmemberPersetech1-Feb-06 8:22 
AnswerRe: Update Resource within yourself? PinmemberDavidCrow1-Feb-06 8:46 
GeneralGreat! Works PERFECTLY!! Pinmembereliran115-Apr-05 5:57 
GeneralHello Sir ! How To... PinmemberThatsAlok20-Jan-05 2:47 
GeneralRe: Hello Sir ! How To... Pinmemberkurackurcevic4-Dec-09 18:03 
GeneralGreat, this really helps a lot! PinmemberPaul.Huang29-Jan-04 23:23 
GeneralArticle editing suggestion PinmemberGary Wheeler9-Sep-03 4:52 
Generalyes, but Pinmembereco8-Sep-03 22:04 
GeneralRe: yes, but PinmemberDavidCrow9-Sep-03 3:06 
GeneralRe: yes, but PinmemberIGx8918-Sep-03 16:24 
GeneralRe: yes, but PinmemberDavidCrow19-Sep-03 3:04 
GeneralRe: yes, but PinmemberIGx8919-Sep-03 3:56 
GeneralRe: yes, but PinmemberFurer Alexander27-Jan-04 3:35 
GeneralRe: yes, but PinmemberDavidCrow27-Jan-04 7:51 
GeneralRe: yes, but PinmemberMichael R27-Jan-04 8:29 
GeneralRe: yes, but PinmemberCPAVG23-Feb-05 22:24 

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