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vb.net+掃描儀 vb調(diào)用掃描儀

vb.net 讀取掃描槍USB接口數(shù)據(jù)的實(shí)例

USB比較難抓數(shù)據(jù),建議是USB模擬串口,或者直接就是串口,這樣數(shù)據(jù)比較好抓。

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USB上傳模式是鼠標(biāo)光標(biāo)在哪數(shù)據(jù)就上傳在哪,所以你抓USB的數(shù)據(jù)的很難!

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怎樣用VB把一張圖片透明的放到Picture里,在線等

Public Function TranBlt(DestHdc As Long, X As Long, Y As Long, W As Long, H As Long, srcHdcOrBmp As Long, Optional srcX As Integer, Optional srcY As Integer, Optional srcW As Long, Optional srcH As Long, Optional tc As Long = -1, Optional IsBmp As Boolean) As Long

'srcHdcOrBmp參數(shù) 傳入的可以是hdc也可以是Bmp對(duì)象的Handle,

'IsBmp參數(shù) 為真時(shí)srcHdcOrBmp代表Bmp對(duì)象的Handle,為假時(shí)代表hdc

'返回值 成功時(shí)返回透明色,不成功時(shí)返回-1

Dim tHdc(3) As MemHdc

Dim J As Long, oc As Long, I As Long, Bm As BITMAP, cc As Long, NewDc As Long

Dim sw As Long, sh As Long, sBmp As Long, sHdc As Long, obm As Long, NewX As Long, NewY As Long

If DestHdc = 0 Or srcHdcOrBmp = 0 Or W = 1 And H = 1 Then GoTo fail

If IsBmp Then '若傳入的是Bmp句柄,需為其創(chuàng)建一個(gè)臨時(shí)DC

sBmp = srcHdcOrBmp

tHdc(3) = NewMyHdc(DestHdc, 0, 0, srcHdcOrBmp)

sHdc = tHdc(3).hdc

Else

sHdc = srcHdcOrBmp

If srcW = 0 Then sBmp = GetCurrentObject(sHdc, 7)

End If

If sHdc = 0 Or sBmp = 0 Then GoTo fail

If srcW = 0 Then '若沒有提供源圖大小,需取得整個(gè)源圖大小

GetObj sBmp, Len(Bm), Bm

sw = Bm.bmWidth - srcX

sh = Bm.bmHeight - srcY

Else

sw = srcW

sh = srcH

End If

If sw 1 Or sh 1 Then GoTo fail

If tc = -1 Then

cc = GetPixel(sHdc, srcX, srcY) '將左上角第一個(gè)像素作為源圖背景色,用于透明

Else

cc = tc

End If

If W sw Or H sh Then

tHdc(2) = NewMyHdc(DestHdc, W, H)

StretchBlt tHdc(2).hdc, 0, 0, W, H, sHdc, srcX, srcY, sw, sh, vbSrcCopy

'先將源圖縮放,下面步驟就一樣了。

NewDc = tHdc(2).hdc

Else

NewDc = sHdc

NewX = srcX

NewY = srcY

End If

BitBlt DestHdc, X, Y, W, H, NewDc, NewX, NewY, vbSrcInvert

'將源圖先反色(XOR)繪入目標(biāo)圖,若源圖背景為黑色,此步可省

'下面是制作Mask圖的方法

I = CreateBitmap(W, H, 1, 1, ByVal 0) '建立單色位圖

tHdc(0) = NewMyHdc(DestHdc, 0, 0, I) '為單色圖建立新DC,并選入

tHdc(1) = NewMyHdc(DestHdc, W, H) '另建一個(gè)彩色圖及DC,用于存放Mask圖

oc = SetBkColor(NewDc, cc) '將源圖背景色改為透明色

BitBlt tHdc(0).hdc, 0, 0, W, H, NewDc, NewX, NewY, vbSrcCopy

'先將源圖繪入單色DC,由此產(chǎn)生只有正反的Mask圖,背景色(透明色)為黑,其它為白

SetBkColor NewDc, oc '恢復(fù)源圖背景色,不是必須的,但這是個(gè)好習(xí)慣。

BitBlt tHdc(1).hdc, 0, 0, W, H, tHdc(0).hdc, 0, 0, vbSrcCopy

'單色DC必須復(fù)制進(jìn)彩色DC才能進(jìn)行后面的的AND運(yùn)算

'Mask圖完成,并已放入彩色DC

BitBlt DestHdc, X, Y, W, H, tHdc(1).hdc, 0, 0, vbSrcAnd '標(biāo)準(zhǔn)透明繪圖:選將Mask圖用And運(yùn)算繪入,

BitBlt DestHdc, X, Y, W, H, NewDc, NewX, NewY, vbSrcInvert '再將源圖以反色(XOR)繪入一次

DelMyHdc tHdc(0)

DelMyHdc tHdc(1)

If tHdc(2).hdc 0 Then DelMyHdc tHdc(2)

If tHdc(3).hdc 0 Then DelMyHdc tHdc(3)

TranBlt = cc

Exit Function

fail:

If tHdc(3).hdc 0 Then DelMyHdc tHdc(3)

TranBlt = -1

End Function

Private Function NewMyHdc(dHdc As Long, W As Long, H As Long, Optional Bm As Long) As MemHdc

With NewMyHdc

.hdc = CreateCompatibleDC(dHdc)

If Bm = 0 Then

.Bmp = CreateCompatibleBitmap(dHdc, W, H)

Else

.Bmp = Bm

End If

.obm = SelectObject(.hdc, .Bmp)

End With

End Function

Private Function DelMyHdc(MyHdc As MemHdc, Optional nobmp As Boolean) As MemHdc

With MyHdc

If .hdc 0 And .obm 0 Then SelectObject .hdc, .obm

If nobmp = False And .Bmp 0 Then DeleteObject .Bmp

If .hdc 0 Then DeleteDC .hdc

End With

End Function

把這個(gè)函數(shù)放在一個(gè)BAS里,然后在窗體里

TranBlt pic.hdc, X,Y,W,H,PIC2.Picture.Handle, _

TX,TY,TW,TH, , True

就OK

如何在vb.net 中錄入條形碼字符,謝謝

93條碼和CODE39一樣,起始符和結(jié)束符都是*號(hào),你做的條碼掃描不出來的原因,估計(jì)和校驗(yàn)碼有關(guān)。93條碼規(guī)定在數(shù)據(jù)的最后有兩個(gè)校驗(yàn)位C和K,如果你的數(shù)據(jù)里沒有生成這兩個(gè)校驗(yàn)位,那肯定是無法掃描的。

VB.NET 有4個(gè)TEXTBOX,4個(gè)掃碼槍,怎么在指定TEXTBOX對(duì)應(yīng)到指定的掃碼槍

如果是usb掃描槍,是焦點(diǎn)在哪它就輸入在哪,不能自動(dòng)對(duì)應(yīng)到相應(yīng)的文本框

如果是串口掃描槍可以實(shí)現(xiàn)你的功能,在代碼里判斷相應(yīng)的串口對(duì)應(yīng)文本框

vb.net代碼,掃描儀

你的想法很難實(shí)現(xiàn)。重寫驅(qū)動(dòng)難度相當(dāng)大。

如果我是你的話,我會(huì)和客戶講明難度,并推薦代替方案。

掃描還是用原本驅(qū)動(dòng)進(jìn)行掃描,保存圖片是保存到制定目錄。

開發(fā)的應(yīng)用系統(tǒng)監(jiān)測(cè)制定目錄,并圖本地文件進(jìn)行保存數(shù)據(jù)庫。

這樣就很容易做了。


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