VC unicode下Cstring转char*

最新推荐文章于 2023-02-21 16:12:34 发布

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本文介绍了一种实现宽字符与多字节字符串转换的方法，包括两个主要函数：CStrFromWSTRU用于将宽字符字符串转换为多字节字符串；BSTRFromCStrU用于将多字节字符串转换为宽字符字符串。这两个函数使用了Windows API中的WideCharToMultiByte和MultiByteToWideChar函数来完成转换，并通过CoTaskMemAlloc和CoTaskMemFree进行内存管理。

用法：
CStrFromWSTRU(CP_ACP, CString, CString.GetLength(), char*);
BSTRFromCStrU(CP_ACP, char*, CString);

函数定义：
BOOL CStrFromWSTRU(IN UINT codePage, IN LPCWSTR wstr, IN UINT len, OUT char *pStr)
{
if (len > 0)
{
size_t mblen = WideCharToMultiByte(codePage, 0, wstr, len, NULL, 0, NULL, NULL);
if (mblen > 0)
{
char buffer = (char )CoTaskMemAlloc(mblen + 1);
ZeroMemory(buffer, mblen + 1);
if (WideCharToMultiByte(codePage, 0, wstr, len, buffer, mblen, NULL, NULL))
{
//buffer[mblen] = ‘\0’;
memcpy(pStr, buffer, mblen);
*(pStr + mblen) = ‘\0’;
CoTaskMemFree(buffer);
return TRUE;
}
}
}
else *pStr = ‘\0’;

return FALSE;

};

BOOL BSTRFromCStrU(IN UINT codePage, IN LPCSTR s, OUT CString &csWStr)
{
csWStr = _T(“”);
int wideLen = MultiByteToWideChar(codePage, 0, s, -1, NULL, 0);
if (wideLen > 0)
{
WCHAR* wideStr = (WCHAR*)CoTaskMemAlloc(wideLen*sizeof(WCHAR));
if (NULL != wideStr)
{
BSTR bstr;

        ZeroMemory(wideStr, wideLen*sizeof(WCHAR));
        MultiByteToWideChar(codePage, 0, s, -1, wideStr, wideLen);
        bstr = SysAllocStringLen(wideStr, wideLen - 1);
        CoTaskMemFree(wideStr);

        csWStr = bstr;
        SysFreeString(bstr);
        return TRUE;
    }
}
return FALSE;

}