PC Forms: Err Msg: The Type of Data Did Not Match...

MORE INFORMATION

When a form is sent, the WriteTaggedControls() function is called to automatically package each of the controls on a form with a non-empty Tag property. The type of control determines what information is written to the package. (For a complete list of properties written to the package based on control type, see page 63 in Chapter 5 of the Microsoft Electronic Forms Designer "Developer's Guide.")

Similarly, when the form is read, the ReadTaggedControls() function is called to unpackage the data. This function extracts information from the package and assigns it to the corresponding Tagged control. If, for example, a control on the Compose form writes a value to the package but is mapped to a control on the Read form that expects text, the above error is displayed.

Example

Suppose you design an E-form so that the selection from a list box on the Compose form is written to a read-only text edit control on the Read form, by trying to use the same "version" Tag property for both controls. When the form is sent, the index of the list box selection is written to the package as a Long data type. When the form is read, the text box with Tag "version" is expecting a String data type, but instead receives a Long. This generates the error message above.

To solve the problem of handling unlike data types, you can add additional code to the WriteMessage() and ReadMessage() functions to package the data manually. For more information on handling list boxes, query on the following words in the Microsoft Knowledge Base: The error message described in this article may also occur when multiple controls have the same Tag property defined. If two controls of different types have the same Tag property, the ReadMessage() function may try to assign an inappropriate value to a control on the Read form.

To solve this problem, be sure to use unique Tag properties.