1
我刚刚遇到一个非常奇怪的问题。当我尝试使用memcpy或=运算符为特定的unsigned int变量赋值(对其他unsigned int变量没有问题)时,程序崩溃时会出现运行时错误。它并不总是在一个程序运行时发生,但当我运行第二个实例时它总是会发生。我通过评论不同的东西彻底检查了代码,所以我非常确定值的分配是问题。将值赋给无符号整数时出现运行时错误
非常感谢提前。
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;
}
}
}
我们需要看代码或我们所能做的只是猜测。 – James 2011-01-27 23:04:37