Solving swedll32.dll not found in VB6

Solving "swedll32.dll not found" during VB6 Debugging - When Compiled EXE Works Fine

Problem:
You are using Swiss Ephemeris swedll32.dll in your VB6 project. The compiled EXE works perfectly, but during debugging in the VB6 IDE, you get "file not found: swedll32.dll" errors.

Why This Happens:
The VB6 debugger and compiled EXE have different DLL search paths:

• Compiled EXE: Looks in the same folder as the executable

• VB6 Debugger: Looks in VB6 IDE folder, system folders, but NOT your project folder

Solutions That Worked:

1. Copy to VB6 IDE Folder

   cmd

   copy swedll32.dll "C:\Program Files\Microsoft Visual Studio\VB98\"

   This ensures the debugger finds the DLL where it searches.

2. Copy to System32 (Already tried but good for reference)

   cmd

   copy swedll32.dll C:\Windows\System32\

3. Run VB6 as Administrator

   • Right-click VB6 shortcut → "Run as Administrator"

   • Ensures proper file access permissions

4. Use Absolute Path in Declare Statements

   vb

   ' Instead of:
   Declare Function swe_calc Lib "swedll32.dll" (...)
   
   ' Use:
   Declare Function swe_calc Lib "C:\Windows\System32\swedll32.dll" (...)

Key Insight:
swedll32.dll is a regular DLL (not COM), so it cannot be added to VB6 project references. The debugger needs to find it in its search path.

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See Also:swedll32