Without a reference to this library in your project, the linker cannot create the XLL if you have used any of these callbacks in your code. The Xlcall32.lib library exports the first two callbacks, Excel4 and Excel4v, and also the XlCallVer function. You should use the #include directive for this file, directly or indirectly via another header file, in all files that access the C API or that handle data types that the C API uses. The Xlcall.h file contains the following items:įunction prototypes for all callback functions.ĭefinitions of the data structures that the callbacks use to exchange data between the DLL/XLL and Excel, and data-type constant definitions.ĭefinitions of the C API function and command equivalents of the worksheet, macro sheet functions, and supported Excel commands.ĭefinitions of callback function return values. If you want to access only the first two callbacks (in any version of Excel), your project needs to include only the first two files. To access all of these, the DLL project must include references to the following files from the Excel 2013 XLL SDK. The last two were introduced in Excel 2007 and are available in subsequent versions.

Enabling DLLs to Call Back into Excelįor a DLL to be able to access the functionality in Excel and get or set workspace information, it must first obtain the addresses of the Excel callback functions Excel4, Excel4v, Excel12, and Excel12v. The static library is downloadable from Microsoft as part of the Microsoft Excel 2013 XLL SDK, which includes both 32-bit and 64-bit versions of this library.

To access these, the DLL must be linked statically at compile time with the Excel 32-bit library, xlcall32.lib. The Excel C API provides several functions that enable DLLs to call back into Excel. However, if your DLL needs to access Excel functionality (for example, to get the contents of a cell, to call a worksheet function, or to interrogate Excel to obtain workspace information), your code must be able to call back into Excel. For more information, see Access DLLs in Excel. If your DLL is self-contained or relies only on other libraries, you must know how to enable Microsoft Excel to access its functions and commands. Applies to: Excel 2013 | Office 2013 | Visual Studio

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