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分享如何读写大于5G的文件？
在NTFS格式下的文件可以大于５GB，但是ReadFileEx(WriteFileEx)函数输入的参数最多为4GB(DWORD只要4GB的寻址空间），怎样才能用ReadFileEx(WriteFileEx)来读写NTFS格式下大于5GB的文件呢？
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snowx 2004-08-03
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不行就试试分段
an_bachelor 2004-08-03
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用古典的
FILE* fp = fopen("filename", "w+b");
for (unsigned long n =0, n2 = 0; ++n < 3)
while (n2++ < 0xffffffff)
{
//fread()/fwrite()
}
可不可以呢？个人认为ntfs文件可以大于5g的特性应该由windows支持 变量溢出的问题可以用变通的方法。
FILE* fp = fopen("filename", "w+b");
for (unsigned long n =0, n2 = 0; ++n < 3)
while (n2++ < 0xffffffff)
{
//fread()/fwrite()
}
可不可以呢？个人认为ntfs文件可以大于5g的特性应该由windows支持 变量溢出的问题可以用变通的方法。
DentistryDoctor 2004-08-03
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你需要在CreateFile的第6参数组合FILE_FLAG_NO_BUFFERING|FILE_FLAG_SEQUENTIAL_SCAN
HANDLE hFile = CreateFile( tempFileName, GENERIC_WRITE|GENERIC_READ,0, NULL, CREATE_NEW,FILE_FLAG_NO_BUFFERING|FILE_FLAG_SEQUENTIAL_SCAN, NULL );
请仔细阅读MSDN中关于CreateFile的帮助。
HANDLE hFile = CreateFile( tempFileName, GENERIC_WRITE|GENERIC_READ,0, NULL, CREATE_NEW,FILE_FLAG_NO_BUFFERING|FILE_FLAG_SEQUENTIAL_SCAN, NULL );
请仔细阅读MSDN中关于CreateFile的帮助。
gunj 2004-08-03
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详细的请参考《Windows核心编程》第17章，内存映射文件
aspnetwuxueyou 2004-08-03
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You can also use Address Windowing Extensions (AWE）
aspnetwuxueyou 2004-08-03
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CreateFileMapping创建一个section object,
然后把section object的一部分映射到内存MapViewOfFile
section object应用很多的
The executive uses sections to load executable images into memory, and the cache manager uses them to access data in a cached file. You can also use section objects to map a file into a process address space. The file can then be accessed as a large array by mapping different views of the section object and reading or writing to memory rather than to the file (an activity called mapped file I/O). When the program accesses an invalid page (one not in physical memory), a page fault occurs and the memory manager automatically brings the page into memory from the mapped file. If the application modifies the page, the memory manager writes the changes back to the file during its normal paging operations (or the application can flush a view by using the Win32 FlushViewOfFile function).
然后把section object的一部分映射到内存MapViewOfFile
section object应用很多的
The executive uses sections to load executable images into memory, and the cache manager uses them to access data in a cached file. You can also use section objects to map a file into a process address space. The file can then be accessed as a large array by mapping different views of the section object and reading or writing to memory rather than to the file (an activity called mapped file I/O). When the program accesses an invalid page (one not in physical memory), a page fault occurs and the memory manager automatically brings the page into memory from the mapped file. If the application modifies the page, the memory manager writes the changes back to the file during its normal paging operations (or the application can flush a view by using the Win32 FlushViewOfFile function).
zhuzhufox 2004-08-03
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CreateFileMapping
esri 2004-08-03
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使用内存映射文件.
huwei001982 2004-08-03
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关于NTFS格式的大文件, M$应该会有专门的 API 才对
好像 WIN32 裡面單個文件最大就只有 2 G
好像 WIN32 裡面單個文件最大就只有 2 G
