帮助编写二进制文件。 [英] Help writing binary file.
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问题描述
您好,
我一直在尝试这个并且无法解决它,有人可以指导我做一个例子或者告诉我我做错了什么。
////////
我正在处理一些数据...获取Count的值。
long ArraySize = Count;
BYTE * FileOut;
FileOut = new BYTE [ArraySize];
///
我可以将我的数据存入文件中。
///
我在尝试将FileOut写入二进制文件时遇到问题。
FILE * file2 = NULL;
if((file2 = fopen(FileName,ab))== NULL)
{
Temp.Format(_T(无法打开指定文件));
}
else
{
fwrite(FileOut,sizeof(FileOut [0]),sizeof(FileOut)/ sizeof(FileOut [0]),file2);
}
delete [] FileOut;
fclose(file2);
任何帮助将不胜感激。
对不起我没有得到完整的数组只有4个数字。
解决方案
你的调试器是针对这类问题。
当你获取sizeof(FileOut)时,你得到的指针FileOut的大小是4个字节。
将此行更改为:
fwrite(FileOut,< span class =code-keyword> sizeof (BYTE), sizeof (BYTE)* ArraySize,file2);
有更正以上。它应该是:
fwrite(FileOut, sizeof (BYTE),ArraySize,file2);
如果将FileOut声明为int,它将正常工作,例如:
fwrite(FileOut, sizeof ( int ),ArraySize,file2) ;
Hello,
I have been trying this and have not been able to resolve it, can someone please direct me to an example or tell me what I am doing wrong.
//////// I am processing some data... getting a value to Count. long ArraySize = Count; BYTE *FileOut; FileOut = new BYTE[ArraySize]; /// I am able to put my data into file out. /// I am having issues trying to write FileOut to a binary file. FILE *file2 = NULL; if ((file2 = fopen(FileName, "ab")) == NULL) { Temp.Format(_T("Could not open specified file")); } else { fwrite(FileOut, sizeof(FileOut[0]), sizeof(FileOut)/ sizeof(FileOut[0]),file2); } delete[]FileOut; fclose(file2);
Any help will be appreciated.
Sorry I am not getting the full array out only 4 numbers.
解决方案
Your debugger is for this type of problem.
When you take sizeof(FileOut) you get the size of pointer FileOut which is 4 bytes.
Change this line to:
fwrite(FileOut, sizeof(BYTE), sizeof(BYTE) * ArraySize, file2);
[Edit]
There is a correction to the above. It should read:
fwrite(FileOut, sizeof(BYTE), ArraySize, file2);
It will then work correctly if FileOut is declared as int for example:
fwrite(FileOut, sizeof(int), ArraySize, file2);
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