我第一次尝试使用CreateFileMapping,当我使用GetLastError()时它会给我这个错误:
ERROR_INVALID_HANDLE: The handle is invalid.
这是我的代码:
// create the name of our file-mapping object
nTry++; // Ensures a unique string is used in case user closes and reopens
wsprintfA(szName, FS6IPC_MSGNAME1 ":%X:%X", GetCurrentProcessId(), nTry);
// stuff the name into a global atom
m_atom = GlobalAddAtomA(szName);
if (m_atom == 0)
{ *pdwResult = ERR_ATOM;
return FALSE;
}
// create the file-mapping object
m_hMap = CreateFileMappingA(
(HANDLE)0xFFFFFFFF, // use system paging file
NULL, // security
PAGE_READWRITE, // protection
0, MAX_SIZE+256, // size
szName); //
编辑:
第一个问题已经解决,但现在我的程序在其他地方崩溃了。
#define FS6IPC_MESSAGE_SUCCESS 1
#define FS6IPC_MESSAGE_FAILURE 0
// IPC message types
#define FS6IPC_READSTATEDATA_ID 1
#define FS6IPC_WRITESTATEDATA_ID 2
// read request structure
typedef struct tagFS6IPC_READSTATEDATA_HDR
{
DWORD dwId; // FS6IPC_READSTATEDATA_ID
DWORD dwOffset; // state table offset
DWORD nBytes; // number of bytes of state data to read
void* pDest; // destination buffer for data (client use only)
} FS6IPC_READSTATEDATA_HDR;
// write request structure
typedef struct tagFS6IPC_WRITESTATEDATA_HDR
{
DWORD dwId; // FS6IPC_WRITESTATEDATA_ID
DWORD dwOffset; // state table offset
DWORD nBytes; // number of bytes of state data to write
} FS6IPC_WRITESTATEDATA_HDR;
while (*pdw)
{ switch (*pdw)
{ case FS6IPC_READSTATEDATA_ID:
pHdrR = (FS6IPC_READSTATEDATA_HDR *) pdw;
m_pNext += sizeof(FS6IPC_READSTATEDATA_HDR);
if (pHdrR->pDest && pHdrR->nBytes)
CopyMemory(pHdrR->pDest, m_pNext, pHdrR->nBytes);
m_pNext += pHdrR->nBytes; // Debugger says the issue is here
break;
case FS6IPC_WRITESTATEDATA_ID:
// This is a write, so there's no returned data to store
pHdrW = (FS6IPC_WRITESTATEDATA_HDR *) pdw;
m_pNext += sizeof(FS6IPC_WRITESTATEDATA_HDR) + pHdrW->nBytes;
break;
default:
// Error! So terminate the scan
*pdw = 0;
break;
}
pdw = (DWORD *) m_pNext;
}
答案 0 :(得分:4)
我猜你是在64位系统上运行,其中HANDLE是64位。操作系统非常正确 - 句柄值0x00000000FFFFFFFF
是您的流程的无效句柄值。
你到底想要做什么?如果要创建由实际文件支持的文件映射,请传入该文件的句柄。如果要创建由页面文件支持的文件映射,请传入INVALID_HANDLE_VALUE
。 INVALID_HANDLE_VALUE
恰好是(HANDLE)-1
,在32位系统上为0xFFFFFFFF
,在64位系统上为0xFFFFFFFFFFFFFFFF
,但这并不重要,因为您应该在任何情况下都只使用符号值INVALID_HANDLE_VALUE
。
如果你的应用程序在传递INVALID_HANDLE_VALUE
时崩溃了,那不是因为对CreateFileMapping
的调用失败,而是出于其他原因,你应该调试这一点。