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Executing EES Macro Commands from EXCEL
This EXCEL sheet contains a macro that will call EES using Dynamic Data Exchange. It should serve as a model of how EES and EXCEL can interact. Note that EES can also communicate with EXCEL directly with macro commands as shown in the Macro file discussion.
The macro will start EES and open the file C:\ees32\examples\EXCEL_EES.ees. It will then copy two columns of data representing temperature and pressure to the clipboard, paste them into the first two columns of the EES Parametric table 'Table 1', solve the table and copy the calculated results back to the clipboard. In this case, the calculated results are the specific enthalpy, entropy, and volume for refrigerant R134a. The EXCEL macro then paste the result into the EXCEL sheet and quits EES. The EXCEL macro is executed when the Calculate button in the Visual Basic form is clicked. The EXCEL example and the EES file that it executes are in the EES32\ Examples folder with file names EXCEL_EES.xls and EXCEL_EES.ees.
Private Sub cmdDDE_Click()
Dim ChannelNumber As Integer
Dim myShell As String
ChannelNumber = -1
myShell = frmEESDDE.txtApp.Text
On Error Resume Next
'Copy selected rows into clipboard which will be pasted into a Parametric Table in EES'
Shell_R = Shell(myShell, 1)
If Shell_R <> "" Then
ChannelNumber = Application.DDEInitiate(app:="ees", topic:="")
If ChannelNumber <> -1 Then
Application.DDEExecute ChannelNumber, "[Open C:\EES32\Examples\EXCEL_EES.ees]"
Application.DDEExecute ChannelNumber, "[Paste Parametric 'Table 1' R1 C1]"
Application.DDEExecute ChannelNumber, "[SOLVETABLE 'TABLE 1', Rows=1..10]"
Application.DDEExecute ChannelNumber, "[COPY ParametricTable 'Table 1' R1 C3:R10 C5]"
'Paste results from EES into EXCEL'
'Quit EES and Terminate DDE
DDEExecute ChannelNumber, "QUIT"
MsgBox "Unable to initiate connection to EES", vbExclamation, "EES DDE"
MsgBox "The application, " & myShell & ", was not found", vbExclamation, "EES DDE"
A listing of the EES program EXCEL_EES.ees appears below.
"This example provides an example of how EES can be called from EXCEL using Dynamic Data Exchange (DDE) and the Macro command ability in EES. Macro commands and DDE are only available in the Professional version. If you have a Professional version and you wish to run this example, close EES, start EXCEL and open the EESDDE.xls file. The EXCEL macro will: 1) start EES; 2) open this file; 3) copy 10 runs of temperature and pressure values and paste them into the Parametric table; 4) Solve the table; and 5) copy the calculated values of h, s, and v back into EXCEL."