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Call this function to set the module state before initialization and/or to restore the previous module state after cleanup.
The AFX_MODULE_STATE structure contains global data for the module, that is, the portion of the module state that is pushed or popped.
By default, MFC uses the resource handle of the main application to load the resource template. If you have an exported function in a DLL, such as one that launches a dialog box in the DLL, this template is actually stored in the DLL module. You need to switch the module state for the correct handle to be used. You can do this by adding the following code to the beginning of the function:
This swaps the current module state with the state returned from AfxGetStaticModuleState until the end of the current scope.