'================================================================
'= DLL内の関数アドレスを取得
'=    (GetProcAddress.bas)
'================================================================
#include "Windows.bi"

' 指定の実行モジュールのハンドルを取得
Declare Function Api_GetModuleHandle& Lib "Kernel32" Alias "GetModuleHandleA" (ByVal ModuleName$)

' DLLをロード
Declare Function Api_LoadLibrary& Lib "Kernel32" Alias "LoadLibraryA" (ByVal lpLibFileName$)

' 実行モジュール内の関数アドレスを取得
Declare Function Api_GetProcAddress& Lib "Kernel32" Alias "GetProcAddress" (ByVal ModuleHandle&, ByVal ProcName$)

' ロードしたDLLの解放
Declare Sub Api_FreeLibrary Lib "Kernel32" Alias "FreeLibrary" (ByVal hLibModule&)

Var Shared Edit1 As Object
Var Shared Edit2 As Object
Var Shared Text1 As Object
Var Shared Text2 As Object
Var Shared Button1 As Object

Edit1.Attach GetDlgItem("Edit1") : Edit1.SetFontSize 14
Edit2.Attach GetDlgItem("Edit2") : Edit2.SetFontSize 14
Text1.Attach GetDlgItem("Text1") : Text1.SetFontSize 14
Text2.Attach GetDlgItem("Text2") : Text2.SetFontSize 14
Button1.Attach GetDlgItem("Button1") : Button1.SetFontSize 14

'================================================================
'=
'================================================================
Declare Function IsFunctionExported(sFunction As String, sModule As String) As Integer
Function IsFunctionExported(sFunction As String, sModule As String) As Integer
    Var hMod As Long
    Var Loaded As Integer
    
    'DLLのハンドルを取得
    hMod = Api_GetModuleHandle(sModule)
    
    If hMod = 0 Then
        hMod = Api_LoadLibrary(sModule)
        If hMod Then Loaded = True
    End If
    
    If hMod Then
        If Api_GetProcAddress(hMod, sFunction) Then IsFunctionExported = True
    End If
    
    If Loaded Then Api_FreeLibrary(hMod)
End Function
'================================================================
'=
'================================================================
Declare Sub Button1_on edecl ()
Sub Button1_on()
    If IsFunctionExported(Edit2.GetWindowText, Edit1.GetWindowText) Then
        A% = MessageBox("", "Dllに「" & Edit2.GetWindowText & "」は、存在します！", 0, 2)
    Else
        A% = MessageBox("", "Dllに「" & Edit2.GetWindowText & "」は、存在しません！", 0, 2)
    End If
End Sub

'================================================================
'=
'================================================================
While 1
    WaitEvent
Wend
Stop
End