关于 如何将不同类型的数据打包成一个数组的问题

[happy446]

有5个全局变量：
int nCount=10;
BOOL bValid=TRUE;
char Letter=’p’;
char szName[32]=”I Love C++.”;
DWORD dwMyQQ=11224455;
完成下面2小题:
(1),写一个函数ToPackage，将这5个全局变量打包，放到一个缓冲区里，并且返回你往缓冲区里面写了多少字节数据,该函数可以这样调用:
char Buffer[1024];
int nWriteDataCount=ToPackage(Buffer,sizeof(Buffer));
(2)，根据题(1)的打包方法,再写一个解包函数，将缓冲区里面的数据读取到上面的全局变量中。

有点迷惑，不同类型的数据怎么打包 成数组呢?还是有别的理解？

哪位高人指教下或者写下代码 谢谢！

[Supper_Jerry]

做一个结构体啊。

[happy446]

姐姐

char Buffer[1024];
int nWriteDataCount=ToPackage(Buffer,sizeof(Buffer));

很明显 是让用数组结构的吧？

[xkyx_cn]

这样可行不，lz试试

#include "iostream.h"
#include "memory.h"

int		nCount = 10;
bool	bValid = true;
char	Letter = 'p';
char	szName[32] = "I Love C++.";
unsigned long	dwMyQQ = 11224455;

int ToPackage(char *Buffer, size_t BufferSize)
{
	int nRet = 0;
	char *p = Buffer;
	size_t size = BufferSize;
	if (size > sizeof(nCount))
	{
		memcpy(p, &nCount, sizeof(nCount));
		p += sizeof(nCount);
		size -= sizeof(nCount);
		nRet += sizeof(nCount);
	}
	if (size > sizeof(bValid))
	{
		memcpy(p, &bValid, sizeof(bValid));
		p += sizeof(bValid);
		size -= sizeof(bValid);
		nRet += sizeof(bValid);
	}
	if (size > sizeof(Letter))
	{
		memcpy(p, &Letter, sizeof(Letter));
		p += sizeof(Letter);
		size -= sizeof(Letter);
		nRet += sizeof(Letter);
	}
	if (size > sizeof(szName))
	{
		memcpy(p, &szName, sizeof(szName));
		p += sizeof(szName);
		size -= sizeof(szName);
		nRet += sizeof(szName);
	}
	if (size > sizeof(dwMyQQ))
	{
		memcpy(p, &dwMyQQ, sizeof(dwMyQQ));
		p += sizeof(dwMyQQ);
		size -= sizeof(dwMyQQ);
		nRet += sizeof(dwMyQQ);
	}

	return nRet;
}

int DePackege(char *Buffer, size_t BufferSize)
{
	int nRet = 0;
	char *p = Buffer;
	size_t size = BufferSize;
	if (size > sizeof(nCount))
	{
		memcpy(&nCount, p, sizeof(nCount));
		p += sizeof(nCount);
		size -= sizeof(nCount);
		nRet += sizeof(nCount);
	}
	if (size > sizeof(bValid))
	{
		memcpy(&bValid, p, sizeof(bValid));
		p += sizeof(bValid);
		size -= sizeof(bValid);
		nRet += sizeof(bValid);
	}
	if (size > sizeof(Letter))
	{
		memcpy(&Letter, p, sizeof(Letter));
		p += sizeof(Letter);
		size -= sizeof(Letter);
		nRet += sizeof(Letter);
	}
	if (size > sizeof(szName))
	{
		memcpy(&szName, p, sizeof(szName));
		p += sizeof(szName);
		size -= sizeof(szName);
		nRet += sizeof(szName);
	}
	if (size > sizeof(dwMyQQ))
	{
		memcpy(&dwMyQQ, p, sizeof(dwMyQQ));
		p += sizeof(dwMyQQ);
		size -= sizeof(dwMyQQ);
		nRet += sizeof(dwMyQQ);
	}
	
	return nRet;
}

int main()
{
	cout << "Variables before ToPackage:" << endl;
	cout << "nCount:" << nCount << endl;
	cout << "bValid:" << bValid << endl;
	cout << "Letter:" << Letter << endl;
	cout << "szName:" << szName << endl;
	cout << "dwMyQQ:" << dwMyQQ << endl;

	char buf[1024];
    int nWriteByte = ToPackage(buf, sizeof(buf));

	cout << "Written bytes:" << nWriteByte << endl;

	int nReadByte = DePackege(buf, nWriteByte);

	cout << "Variables after DePackege:" << endl;
	cout << "nCount:" << nCount << endl;
	cout << "bValid:" << bValid << endl;
	cout << "Letter:" << Letter << endl;
	cout << "szName:" << szName << endl;
	cout << "dwMyQQ:" << dwMyQQ << endl;

	cout << "Read bytes:" << nReadByte << endl;
	
	return 0;
}

[taodm]

要你把不同类型的数据存到文件里，你会么？

[xkyx_cn]

上面的if判断少了一个＝号：
if (size > sizeof(nCount))
改成：
if (size >= sizeof(nCount))

所有的都改掉

[gl0312]

[Quote=引用 1 楼 Supper_Jerry 的回复:]
做一个结构体啊。
[/Quote]

[kimiya25]

不用结构体可以考虑使用void*数组