api呼叫計算器的例子，實現不同程式的資料交換。此方法同樣適用其他office元件的呼叫（可能要稍作修改）
基本原理：尋找計算器的edit控制代碼，用sendmessage返回結果，並不算複雜。
模組**：
private declare function findwindow lib "user32" alias "findwindowa" (byval lpclassname as string, byval lpwindowname as string) as long
private declare function findwindowex lib "user32" alias "findwindowexa" (byval hwnd1 as long, byval hwnd2 as long, byval lpsz1 as string, byval lpsz2 as string) as long
private declare function setwindowtext lib "user32" alias "setwindowtexta" (byval hwnd as long, byval lpstring as string) as long
private declare function sendmessage lib "user32" alias "sendmessagea" (byval hwnd as long, byval wmsg as long, byval wparam as long, lparam as any) as long
private const wm_gettext = &hd
private const wm_gettextlength = &he
private const wm_settext = &hc
'下面主要是檢測計算器是否關閉
do ' 外層迴圈。
do while edithwnd <> 0 ' 內層迴圈。
calchwnd = findwindow("scicalc", vbnullstring)
edithwnd = findwindowex(calchwnd, 0, "edit", vbnullstring)
'判斷計算器是否關閉
if edithwnd = 0 then ' 如果條件為 true...
check = false ' 將標誌值設定為 false。
exit do ' 終止內層迴圈。
else
'取計算器的值
edittext = space(sendmessage(edithwnd, wm_gettextlength, byval 0, byval 0))
sendmessage edithwnd, wm_gettext, byval len(edittext) + 1, byval edittext
'臨時賦給變數
presult = edittext
doevents '這個起延時作用,否則不能正確返回數值
'判斷 presult的值是否為空,代表是否關閉計算器
if len(trim(presult)) <> 0 then
if right((presult), 1) = "." then
presult = mid(presult, len(presult) - 1)
end if
dblcal = ccur(presult)
end if
end if
loop
loop until check = false ' 立即終止外層迴圈
'控制項賦值並按要求四捨五入
' dblcal = ccur(dblcal)
ctl.value = roundtolarger(dblcal, intdecimals)
end function
public function roundtolarger(dblinput as currency, intdecimals as integer) as currency '四捨五入
dim strformatstring as string
if dblinput <> 0 then
strformatstring = "#." & string(intdecimals, "#")
roundtolarger = format(dblinput, strformatstring)
else
roundtolarger = 0
end if
end function
窗體**：
private sub command0_click()
txtvalfrmcal me.text1, 3
end sub
private sub command5_click()
txtvalfrmcal me.text3, 1
end sub
private sub command8_click()
txtvalfrmcal me.text6, 2
end sub
VBA 通過API函式，呼叫計算器，模擬按鍵等操作
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