如何将CString 转换为LPCSTR ?

[adaisong]

在使用SHFileOperation(...)时其中有两个参数pFrom, pTo是LPCSTR,而我的路径保存在CString类中.没办法将CString转换为LPCSTR.
请给位大虾指点!

[DrSmart]

(LPCSTR)(LPCTSTR)

[junliu_0]

_variant_t(from)

[adaisong]

lpsh.pFrom= (LPCSTR)_variant_t(from);
无法通过编译

[junliu_0]

lpsh.pFrom= _variant_t(from);

[qiushuiwuhen]

lpsh.pFrom= (LPCSTR)(LPCTSTR)from;
lpsh.pFrom[_tcslen(lpsh.pFrom)]=0;

[xing_xing_xing]

后面要多加一个字符串结束符号
pFrom
Address of a buffer to specify one or more source file names. These names must be fully qualified paths. Standard Microsoft MS-DOS wild cards, such as "*", are permitted in the file-name position. Although this member is declared as a null-terminated string, it is used as a buffer to hold multiple file names. Each file name must be terminated by a single NULL character. An additional NULL character must be appended to the end of the final name to indicate the end of pFrom.

char buf[MAX_PATH + 1];
strcpy(buf,"H:\\DIPDemo\\Boat.bmp");
buf[strlen(buf)] = '\0';

[striking]

CString会去掉SHFILEOPSTRUCT必须的双NULL终止符中的一个。所以建议用字符数组来构建SHFILEOPSTRUCT所需的参数。

for example

CString pszPath = "c:\\";

TCHAR buf[_MAX_PATH + 1]; // allow one more character
_tcscpy(buf, pszPath); // copy caller's path name
buf[_tcslen(buf)+1]=0; // need two NULLs at end


lpsh.pFrom= buf;

[vcmute]

lpsh.pFrom= from.GetBuffer(from.GetLength()+2);
from.ReleaseBuffer();

[striking]

buf[_tcslen(buf)+1]=0; // need two NULLs at end 关键在这, 需要2个终止符

[snlux]

CString strPathName = TEXT("...");

char szFrom[1024] = { 0 };
_tcscpy(buf, T2A(strPathName));
lpsh.pFrom = szFrom;

[adaisong]

3q everyone!

[f9941220]

使用成员函数GetBufferSetLength。
CString szTmp;
szTmp.GetBufferSetLength(100);
MSDN解释：
CString::GetBufferSetLength
Call this member function to retrieve a pointer to the internal character buffer for the CString object, truncating or growing its length if necessary to exactly match the length specified in nNewLength. The returned LPTSTR pointer is not const and thus allows direct modification of CString contents.

Syntax
LPTSTR GetBufferSetLength( int nNewLength );

[客家族_Shark曾_小凡仙]

使用成员函数GetBufferSetLength。
CString szTmp;
szTmp.GetBufferSetLength(100);
MSDN解释：
CString::GetBufferSetLength
Call this member function to retrieve a pointer to the internal character buffer for the CString object, truncating or growing its length if necessary to exactly match the length specified in nNewLength. The returned LPTSTR pointer is not const and thus allows direct modification of CString contents.

Syntax
LPTSTR GetBufferSetLength( int nNewLength );

[lonkil]

关于CString类型间的互相转换

http://www.vcfans.com/article/vc/2005/07/211756803.htm

[飞驰的青蛙]

强制类型转换(LPCSTR)XXXX

[nodefault]

LPCSTR DATA = str;

[herman~~]

CString str;
str = "hello";
char * ch = "hello2";
LPSTR p=str.GetBuffer();

[Kaile]

CString strTmp = "abc";
LPCSTR pStr = (LPCSTR ) strTmp.GetBuffer(strTmp.GetLength());

[deutsch]

这是msdn中现有的例子：
CString theString( "This is a test" );
LPTSTR lpsz = new TCHAR[theString.GetLength()+1];
_tcscpy(lpsz, theString);
//... modify lpsz as much as you want
很多问题msdn中就有啊！！！！！！！！！

[zyyoung]

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