ReadPrinter |
VB聲明 |
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Declare Function ReadPrinter Lib "winspool.drv" Alias "ReadPrinter" (ByVal hPrinter As Long, pBuf As Any, ByVal cdBuf As Long, pNoBytesRead As Long) As Long |
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說明 |
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從打印機(jī)讀入數(shù)據(jù) |
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返回值 |
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Long,非零表示成功,零表示失敗。會設(shè)置GetLastError |
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參數(shù)表 |
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參數(shù) |
類型及說明 |
hPrinter |
Long,一個已打開的打印機(jī)的句柄(用OpenPrinter獲得) |
pBuf |
Any,指定一個緩沖區(qū)或結(jié)構(gòu),用于裝載來自打印機(jī)的數(shù)據(jù) |
cdBuf |
Long,欲讀入的緩沖區(qū)大小或字節(jié)數(shù) |
pNoBytesRead |
Long,用于裝載實際讀取字節(jié)數(shù)的一個變量 |
注解 |
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為使這個函數(shù)正常使用,端口必須是雙向的 |
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