Benjamin

静以修身,俭以养德,非澹薄无以明志,非宁静无以致远。
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数据加载中……

WCHAT、TCHAT、CString和char*的转换(WM5.0)

在平时的编程中字符串转换经常遇到,常用的是MultiByteToWideChar和WideCharToMultiByte,具体的函数如下:
/////////////////////////////////////////////////////////////////////////////
//Description:
// This function maps a wide-character string to a new character string
//
//Parameters:
// lpcwszStr: [in] Pointer to the character string to be converted
// lpszStr: [out] Pointer to a buffer that receives the translated string.
// dwSize: [in] Size of the buffer
//
//Return Values:
// TRUE: Succeed
// FALSE: Failed
//
//Example:
// MByteToWChar(szW,szA,sizeof(szA)/sizeof(szA[0]));
//////////////////////////////////////////////////////////////////////////////
BOOL WCharToMByte(LPCWSTR lpcwszStr, LPSTR lpszStr, DWORD dwSize)
{
 DWORD dwMinSize;
 dwMinSize = WideCharToMultiByte(CP_OEMCP,NULL,lpcwszStr,-1,NULL,0,NULL,FALSE);
 if(dwSize < dwMinSize)
 {
  return FALSE;
 }
 WideCharToMultiByte(CP_OEMCP,NULL,lpcwszStr,-1,lpszStr,dwSize,NULL,FALSE);
 return TRUE;
}
///////////////////////////////////////////////////////////////////////////////
//Description:
// This function maps a character string to a wide-character (Unicode) string
//
//Parameters:
// lpcszStr: [in] Pointer to the character string to be converted
// lpwszStr: [out] Pointer to a buffer that receives the translated string.
// dwSize: [in] Size of the buffer
//
//Return Values:
// TRUE: Succeed
// FALSE: Failed
//
//Example:
// MByteToWChar(szA,szW,sizeof(szW)/sizeof(szW[0]));
///////////////////////////////////////////////////////////////////////////////
BOOL MByteToWChar(LPCSTR lpcszStr, LPWSTR lpwszStr, DWORD dwSize)
{
    // Get the required size of the buffer that receives the Unicode
    // string.
    DWORD dwMinSize;
    dwMinSize = MultiByteToWideChar (CP_ACP, 0, lpcszStr, -1, NULL, 0);
 
    if(dwSize < dwMinSize)
    {
  return FALSE;
    }
 
    // Convert headers from ASCII to Unicode.
    MultiByteToWideChar (CP_ACP, 0, lpcszStr, -1, lpwszStr, dwMinSize); 
    return TRUE;
}
很少有人提及到下面的两个函数size_t  wcstombs(char (&mbstr)[size], const wchar_t *wcstr,  size_t count );
size_t mbstowcs( wchar_t (&wcstr)[size], const char *mbstr, size_t count ); 以为只能用在COM中,其实不然,还可以用在WM5.0和Wince平台;
用这两个函数的好处就是一行代码就可以完成转换。要注意的是在用wcstombs函数时第三个参数必须是第二个参数长度的两倍,用mbstowcs是第三个参数是第二个参数的长度,wcstombs可以完成WCHAR、TCHAR、CString向char*的转换。
CString是MFC中的类,可以用WCHAR、TCHAR、cahr*直接初始化和赋值;值得一提的是在WM5.0、WCE平台稍微有些和其他windows平台不同的是,虽然函数传参时无论WCHAR/TCHAR、char*都可以转成CString作参数传递,因为函数传参实际是一个赋值的过程。但是在输出到设备上时,还必须用mbstowcs函数来转换。
虽然Wce和Mobile平台上只能用Unicode,但是读写文件时依然可以用标准C的文件操作函数,但是读写文件时用的字符要一致。
关于VS2008平台字符串转换,请看http://msdn.microsoft.com/zh-cn/library/ms235631(VS.80).aspx

posted on 2008-08-21 22:30 Benjamin 阅读(2883) 评论(26)  编辑 收藏 引用 所属分类: PDA/PPC开发

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