Quick access. Search related threads. Remove From My Forums. Answered by:. Archived Forums. Visual Basic. Not for VB6 questions. Sign in to vote. Thanks in advance for your help Best regards, Conny. Wednesday, August 11, PM. On In this way you have probably 2 projects in your solution. Every build needs a startup project, if that is a dll a Dll will be made. You can than easily select that startup project. In the center pane, select Win32 Console Application. On the Application Settings page, under Application type , select Console application if it isn't already selected.
When the wizard finishes, a minimal console application project is created for you. Next, to call the MathLibrary functions in your source code, your project must include the MathLibrary.
You could copy this header file into your client app project, then add it to the project as an existing item. This method can be a good choice for third-party libraries. However, if you're working on the code for your DLL and your client at the same time, the header files could get out of sync. To avoid this issue, set the Additional Include Directories path in your project to include the path to the original header.
In the Configuration drop-down box, select All Configurations if it's not already selected. In the property pane, select the drop-down control next to the Additional Include Directories edit box, and then choose Edit. Double-click in the top pane of the Additional Include Directories dialog box to enable an edit control.
Or, choose the folder icon to create a new entry. In the edit control, specify the path to the location of the MathLibrary. You can choose the ellipsis You can also enter a relative path from your client source files to the folder that contains the DLL header files. If you followed the directions to put your client project in a separate solution from the DLL, the relative path should look like this:.
If your DLL and client projects are in the same solution, the relative path might look like this:. When the DLL and client projects are in other folders, adjust the relative path to match. Or, use the ellipsis control to browse for the folder.
After you've entered the path to the header file in the Additional Include Directories dialog box, choose the OK button. In the Property Pages dialog box, choose the OK button to save your changes. You can now include the MathLibrary. Replace the contents of MathClient. This code can be compiled, but not linked. If you build the client app now, the error list shows several LNK errors. That's because your project is missing some information: You haven't specified that your project has a dependency on the MathLibrary.
And, you haven't told the linker how to find the MathLibrary. To fix this issue, you could copy the library file directly into your client app project. The linker would find and use it automatically. However, if both the library and the client app are under development, that might lead to changes in one copy that aren't shown in the other. To avoid this issue, you can set the Additional Dependencies property to tell the build system that your project depends on MathLibrary. And, you can set an Additional Library Directories path in your project to include the path to the original library when you link.
It ensures that any property changes apply to both Debug and Release builds. In the property pane, select the drop-down control next to the Additional Dependencies edit box, and then choose Edit. In the Additional Dependencies dialog, add MathLibrary. In the property pane, select the drop-down control next to the Additional Library Directories edit box, and then choose Edit. Double-click in the top pane of the Additional Library Directories dialog box to enable an edit control.
By default, it's in a folder called Debug directly under the DLL solution folder. If you create a release build, the file is placed in a folder called Release. If you followed the directions to put your client project in a separate solution from the DLL project, the relative path should look like this:. Once you've entered the path to the library file in the Additional Library Directories dialog box, choose the OK button to go back to the Property Pages dialog box.
Choose OK to save the property changes. Your client app can now compile and link successfully, but it still doesn't have everything it needs to run. If it can't find the DLL in certain system directories, the environment path, or the local app directory, the load fails. Depending on the operating system, you'll see an error message like this:. One way to avoid this issue is to copy the DLL to the directory that contains your client executable as part of the build process.
The command specified here copies the DLL only if it's missing or has changed. It uses macros to copy to and from the Debug or Release locations, based on your build configuration. In the Configuration drop-down box, select All Configurations if it isn't already selected. In the property pane, select the edit control in the Command Line field. If you followed the directions to put your client project in a separate solution from the DLL project, then enter this command:. Now your client app has everything it needs to build and run.
The Output window in Visual Studio should have something like the following example depending on your version of Visual Studio:. Congratulations, you've created an application that calls functions in your DLL. Now run your application to see what it does. There are a few ways to do it based on your circumstances. On the project properties window, click Build tab. This makes Visual Studio do two things automatically when the project is compiled.
First, it will generate a. Second, it will register class information for the COM component in Windows registry. Here is what is registered in Windows registry for the compiled assembly so that COM clients can use the.
NET class transparently. To register the assembly on other computers such as production machines, you can register the assembly by using RegAsm. See this article for details. Compile the project. Build the solution. Then go to bin folder.
Copy the type library file to Windows system folder. Reference the type library from Access VBA editor. First, create a new Access database and open Visual Basic code editor. When the References window is opened, click the button Browse. After done, SimpleCalc will appear in your reference list and you need to move down in the list to find and check it.
Then click OK to close the Reference window. Add a button to the Access form and then add a click event to it. In the click event we call a function called test which is created within a VBA module. Net DLL by creating a new object from Calc class and then call its methods. Calc objCalc. SetNumberOne 3 objCalc. You can see the result value either in Immediate window or by moving mouse over the lngResult variable. In this article, we have gone through the steps to create a. It brings the power of.
Net into Microsoft Office applications. The limitation in this article is that Visual Studio registered our DLL and type library automatically for our development machine only. We haven't covered how to deploy the DLL to a production machine. In this case, check out this article about how to use Regasm. Note that you can also create a setup package for your application and add regasm. Happy Coding!
How to correctly reference and call a DLL 2.
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