我的一段创建并打开文件的代码,总是出错,不知为什么?请大侠帮我.

[vctool]

HANDLE hFile;
HANDLE hFileMapping;
LPVOID lpFileBase;

hFile = CreateFile(strFileName, GENERIC_WRITE|GENERIC_READ, 0, 0,
CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0);

if ( hFile == INVALID_HANDLE_VALUE )
{
AfxMessageBox("Couldn't open file with CreateFile()\n");
return ;
}
hFileMapping = CreateFileMapping(hFile, NULL, PAGE_READWRITE, 0, 0, NULL);
if ( hFileMapping == 0 )
{
DWORD dw=GetLastError();
// 出错代码:1006 文件所在的卷已被外部改变,因此打开的文件不再有效。
CloseHandle(hFile);
AfxMessageBox("Couldn't open file mapping with CreateFileMapping()\n");
return;
}
文件已经打开成功了,但在MAPING时出错了,不知什么原因.

[oyljerry]

maping的name呢

[vctool]

怎么没人回答呢?

[vctool]

to oyljerry.
If this parameter is NULL, the mapping object is created without a name.
我看这个参数是可以为0的

[快乐鹦鹉]

这样修改就好了！
只修改CreateFileMapping函数的倒数第二个参数
HANDLE hFile;
HANDLE hFileMapping;
LPVOID lpFileBase;
hFile = CreateFile("C:\\aa.tt", GENERIC_WRITE|GENERIC_READ, 0, 0,
CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0);

if ( hFile == INVALID_HANDLE_VALUE )
{
AfxMessageBox("Couldn't open file with CreateFile()\n");
return ;
}
hFileMapping = CreateFileMapping(hFile, NULL, PAGE_READWRITE, 0, 0x4000000, NULL);
if ( hFileMapping == 0 )
{
DWORD dw=GetLastError();
// 出错代码:1006 文件所在的卷已被外部改变,因此打开的文件不再有效。
CloseHandle(hFile);
AfxMessageBox("Couldn't open file mapping with CreateFileMapping()\n");
return;
}

[快乐鹦鹉]

dwMaximumSizeLow
[in] Low-order DWORD of the maximum size of the file-mapping object. If this parameter and dwMaximumSizeHigh are zero, the maximum size of the file-mapping object is equal to the current size of the file identified by hFile.
An attempt to map a file with a length of zero in this manner fails with an error code of ERROR_FILE_INVALID. Applications should test for files with a length of zero and reject such files.
看最后一段的说明，你就知道怎么回事了。

[oyljerry]

加锁保护内存文件

[pcyy]

up

[vctool]

谢谢大家,特别是happyparrot(快乐鹦鹉)