subject_36957.htm

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序号：36957 发表者：Jane28 发表日期：2003-04-20 12:01:22
<br>主题：急事！！！怎样将一个bmp分成127byte得块，然后再恢复成bmp？
<br>内容：bmp是不知大小，但一点小于65535byte。我自己写了一个，但是10k的只能恢复到9.29k。请问原因何在？<BR>CString m_name = "c:\\winnt\\zapotec.bmp";<BR>CFile MyFile1,MyFile2;<BR>if(!(MyFile1.Open(_T(m_name),CFile::modeRead)))<BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; AfxMessageBox("Can't open file");<BR>}<BR>if(!(MyFile2.Open("11.bmp",CFile::modeWrite|CFile::modeCreate)))<BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;AfxMessageBox("Can't creat file");<BR>}<BR>long Length = MyFile1.GetLength();<BR>char pData[65535];<BR>char *p;<BR>p = pData;<BR>MyFile1.Read((void *)pData,(UINT)Length);<BR>char sData[127];<BR>CString Data,rData;<BR>long i,k;<BR>for(i=0;i&lt;Length/126;i++)<BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;for(k=0;k&lt;126;k++)<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;sData[k] = *p;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;p++;<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;Data.Format("%c",sData);<BR>&nbsp;&nbsp;&nbsp;&nbsp;rData=rData+Data;<BR>}<BR>for(i=0,k=0;i&lt;Length%126;i++,k++)<BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;sData[k] = *p;<BR>&nbsp;&nbsp;&nbsp;&nbsp;p++;<BR>}<BR>Data.Format("%c",sData);<BR>rData=rData+Data;<BR>MyFile2.Write((void *)rData.GetBuffer(rData.GetLength()),(UINT)Length);<BR>MyFile1.Close();<BR>MyFile2.Close();<BR>请问这个程序有什么问题？如果有更简单的，望告知！<BR>
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<font color=red>答案被接受</font><br>回复者：neilgan 回复日期：2003-04-20 13:35:38
<br>内容：Full of bugs.<BR><BR>1. CString is for NULL-Terminated strings. The content of .bmp file can be anything, including some NULL characters, so, you shouldn't use CString for this purpose.<BR><BR>2. Data.Format("%c",sData);<BR>What do you want to do writting this? Let me tell you what will happen in this line. CString::Format will read the first argument and find that it is required to format a char, then it goes to the second argument ,cast it to a char and put it to "Data". This line is same as:<BR>Data.Format("%c",(char)sData);<BR>or:<BR>Data.Format("%c",sData &amp; 0xff);<BR>Surely it is not what you want.<BR><BR>you should delete all references to CString and change Data.Format(...) to: MyFile2.Write((void*)sData,k);<BR><BR>
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回复者：aijun 回复日期：2003-04-20 15:03:30
<br>内容：老兄啊，如何输出一个位图，如何把位图数据还原在屏幕上啊，<BR>应该用那种数据读出位图数据？
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回复者：Jane28 回复日期：2003-04-20 15:12:51
<br>内容：我知道也不用问你啦，我就是希望你能回答我的问题，提供一些好的方法。你说应该用什么输出格式？
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回复者：Jane28 回复日期：2003-04-20 15:16:16
<br>内容：因为我这个是硬件的电脑程序，而硬件每一次最多只能发送127byte所以我才要拆开它来。
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回复者：aijun 回复日期：2003-04-20 15:19:09
<br>内容：有没有位图数据的专用格式啊，它不是RGB的吗，有没有像int char这种类似的啊。
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回复者：Jane28 回复日期：2003-04-20 15:31:12
<br>内容：我现在不知道。<BR>
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