CreateDC
內(nèi)容
CreateDC, CreateDCBynum |
VB聲明 |
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Declare Function CreateDC& Lib "gdi32" Alias "CreateDCA" (ByVal lpDriverName As String, ByVal lpDeviceName As String, ByVal lpOutput As String, lpInitData As DEVMODE) Declare Function CreateDCBynum& Lib "gdi32" Alias "CreateDCA" (ByVal lpDriverName As String, ByVal lpDeviceName As String, ByVal lpOutput As String, lpInitData As Long) |
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說明 |
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為專門設(shè)備創(chuàng)建設(shè)備場(chǎng)景 |
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返回值 |
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Long，新設(shè)備場(chǎng)景句柄，若出錯(cuò)則為零 |
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參數(shù)表 |
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參數(shù) |
類型及說明 |
lpDriverName |
String，用vbNullString傳遞null值給該參數(shù)，除非：1、用DISPLAY，是獲取整個(gè)屏幕的設(shè)備場(chǎng)景；2、用WINSPOOL，則是訪問打印驅(qū)動(dòng) |
lpDeviceName |
String，所用專門設(shè)備的名稱。該名由打印管理器分配顯示 |
lpOutput |
String，用vbNullString傳遞null值給該參數(shù) |
lpInitData |
DEVMODE，這個(gè)結(jié)構(gòu)保存初始值。用CreateDCBynum傳遞0（NULL）值則適用默認(rèn)設(shè)置 |
注解 |
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在繪制之前，先要為該設(shè)備場(chǎng)景選定一個(gè)位圖。不再需要時(shí)，該設(shè)備場(chǎng)景可用DeleteDC函數(shù)刪除。刪除前，其所有對(duì)象應(yīng)回復(fù)初始狀態(tài)。若有設(shè)備初始設(shè)置可用DocumentProperties API函數(shù)載入DEVMODE結(jié)構(gòu)。使用屏幕設(shè)備場(chǎng)景（DISPLAY）時(shí)要小心，因?yàn)樗鼤?huì)干擾其他應(yīng)用程序的外觀 |
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示例：靠近屏幕左上角畫一個(gè)矩形 |
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dc& = CreateDCBynum("DISPLAY", vbNullString, vbNullString, 0) dl& = Rectangle(dc&, 5, 5, 100, 100) |
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