[英]Windows WriteFileGather function set last error as ERROR_INVALID_PARAMETER
示例代码重现我的问题:
#include <windows.h>
#include <iostream>
int main()
{
using namespace std;
HANDLE hdl = CreateFile("test.file", GENERIC_WRITE,
FILE_SHARE_WRITE, NULL, OPEN_ALWAYS,
FILE_ATTRIBUTE_NORMAL |
FILE_FLAG_NO_BUFFERING |
FILE_FLAG_OVERLAPPED,
NULL);
char data[4096] = {0};
DWORD written = 0;
for(size_t i = 0; i < sizeof(data); ++i)
data[i] = 'a' + (i % 26);
OVERLAPPED async_hdl = {0};
FILE_SEGMENT_ELEMENT segs[3] = {0};
segs[0].Buffer = PtrToPtr64(data);
segs[1].Buffer = PtrToPtr64(data);
if(!WriteFileGather(hdl, segs, 8192, NULL, &async_hdl)) {
cout << "Last error: " << GetLastError() << endl;
cout << "overlapped internal status: " << async_hdl.Internal << endl;
// Last error: 87
// overlapped internal status: 259
}
CloseHandle(hdl);
return 0;
}
我使用Visual Studio 2012对其进行编译并在Windows 7上进行测试。作为内联注释, WriteFileGather
函数始终将最后一个错误设置为ERROR_INVALID_PARAMETER
(87),并且OVERLAPPED结构的Internal
字段为259
。
我错过了什么?
MSDN: aSegmentArray
...系统内存页,并且必须在系统内存页大小边界上对齐。 使用_aligned_malloc()
而不是堆栈内存。
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