CODEWITHSUNDEEP
c++visual-studiovisual-c++resourcesstatic-libraries
meissnersd
meissnersd

Reputation: 1312

How to load a custom binary resource in a VC++ static library as part of a dll?

I have custom binary resources (animated cursors) that would like to store as resources in a static lib in Visual Studio C++. It turns out that custom binary resources will not get loaded by ::LoadCursor() or found by ::FindResource() if it is a custom resource and in a static library.

This question gives some work around.

Following its advice, if I add the *.res file to an exe as a "Configuration Property->Linker->Additional Dependency" then the static library will be able to find the resource.

BUT if the static library is part of a dll and I link it in as an Additional Dependency it is not found again!

How can I link the resources in a dll?

Or just make the binary be found in the static lib? The methods in the question are pretty cumbersome.

Upvotes: 21

Views: 32693

Answers (3)

Michal Pokluda
Michal Pokluda

Reputation: 390

In case you use dll using MFC (and CWinApp), you can obtain the HMODULE from CWinApp. 

extern MyDllApp theApp;
HMODULE module = (HMODULE)theApp.m_hInstance;
HRSRC myResource = ::FindResource(module,
            MAKEINTRESOURCE(IDR_FILE_RESOURCE), _T("GROUP_NAME"));

If you supply NULL in FindResource, application won't find your resource.

Upvotes: 1

Ralph Erdt
Ralph Erdt

Reputation: 561

The Problem of @LihO answer is:

The first parameter of FindResource is the ModuleID of the Module containing the resources. If this is set to NULL the function will search in created process (.exe), not the DLL.

But how to get the HMODULE insinde a static LIB?

  • add a function / parameter, which will get the HMODULE from the DLL. The HMODULE / HINSTANCE (is the same) can be retrieved in DLLMain.
  • Try this GetCurrentModule

Edit:

See also: Add lib resource to a library

Upvotes: 1

LihO
LihO

Reputation: 42083

In Add Resource dialog click Import, select "All Files (.)" so that it allows you to import file of any type, and then just select the file you want there. When Custom Resource Type dialog pops up, type RCDATA into "Resource type" field.

If you open .rc file, you will see something like this:

/////////////////////////////////////////////////////////////////////////////
//
// RCDATA
//

IDR_RCDATA1          RCDATA               "myfile.whatever"

and it will generate resource.h with following line:

#define IDR_RCDATA1                  101

In code you access it like this:

#include "resource.h"
#include <windows.h>

int main(int argc, char* argv[])
{
    HRSRC myResource = ::FindResource(NULL, MAKEINTRESOURCE(IDR_RCDATA1), RT_RCDATA);
    HGLOBAL myResourceData = ::LoadResource(NULL, myResource);
    void* pMyBinaryData = ::LockResource(myResourceData);
    return 0;
}

where pMyBinaryData is pointer to first byte of this executable. For more information visit Resource Functions

Here's an example how you would save binary resource like this on disk:

#include "resource.h"
#include <windows.h>
#include <fstream>

int main(int argc, char* argv[])
{
    HRSRC myResource = ::FindResource(NULL, MAKEINTRESOURCE(IDR_RCDATA1), RT_RCDATA);
    unsigned int myResourceSize = ::SizeofResource(NULL, myResource);
    HGLOBAL myResourceData = ::LoadResource(NULL, myResource);
    void* pMyBinaryData = ::LockResource(myResourceData);

    std::ofstream f("C:\\x.bin", std::ios::out | std::ios::binary);
    f.write((char*)pMyBinaryData, myResourceSize);
    f.close();

    return 0;
}

When you build project with resource like that, this resource will become part of your program (dll).

Upvotes: 47

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