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我剛剛遇到一個非常奇怪的問題。當我嘗試使用memcpy或=運算符爲特定的unsigned int變量賦值(對其他unsigned int變量沒有問題)時,程序崩潰時會出現運行時錯誤。它並不總是在一個程序運行時發生,但當我運行第二個實例時它總是會發生。我通過評論不同的東西徹底檢查了代碼,所以我非常確定值的分配是問題。將值賦給無符號整數時出現運行時錯誤
非常感謝提前。
DWORD WINAPI RecvFunc(void* lpParameter)
{
BYTE header[5];
short size, datasize; // must be unsigned, changed to signed for testing
int num;
BYTE* data;
BYTE opcode;
while(true)
{
size = 0;
while(size < 5)
{
num = recv(sock, (char*)(header + size), 5 - size, 0);
if(num <= 0)
{
size = 0;
break;
}
//MessageBox(g_hwnd, "Header piece ok", "", MB_OK);
size += num;
}
if(size == 0)
{
//MessageBox(g_hwnd, "Header error", "", MB_OK);
continue;
}
opcode = header[0];
memcpy(&datasize, header + 1, sizeof(datasize));
if(datasize > 5)
{
data = new BYTE[datasize - 5];
}else{
data = NULL;
}
while(size < datasize)
{
num = recv(sock, (char*)(data + size - 5), datasize - size, 0);
//MessageBox(g_hwnd, "Packet post-recv", "", MB_OK);
if(num <= 0)
{
size = 0;
break;
}
size += num;
}
if(size == 0)
{
//MessageBox(g_hwnd, "Packet error", "", MB_OK);
delete[] data;
continue;
}
size -= 5;
//MessageBox(g_hwnd, "Received a command", "New cmd", MB_OK);
switch(opcode)
{
...
}
if(data != NULL)
{
delete[] data;
}
}
}
我們需要看代碼或我們所能做的只是猜測。 – James 2011-01-27 23:04:37