CString to const char*

_Flaviu

I am trying to convert a CString to const char*, and I have tried some versions:

CString sTemp("abcd");
const char* chTemp = (LPCSTR)(LPCTSTR)sTemp;

is one of them, but in chTemp I have only one letter from sTemp, not whole string ... why ?

Victor Nijegorodov

Is your build a UNICODE one? Then you will have to convert, not just cast your CString data. See [WideCharToMultiByte function (stringapiset.h) | Microsoft Docs](https://docs.microsoft.com/en-us/windows/win32/api/stringapiset/nf-stringapiset-widechartomultibyte) or ATL macros like W2A

_Flaviu

I have converted the project to multi-byte character set (was unicode) and the behavior is the same ...

_Flaviu

I have tried this also:

const char\* chTemp = (const char\*)sTemp.GetBuffer(0);
sTemp.ReleaseBuffer();
TRACE(">>>>>>>>>>>>>>>>>>>%s\\n", chTemp);

the project is not multi-byte ... the same result, just one letter (first letter) from the string ...

Victor Nijegorodov

_Flaviu wrote:

the project is not multi-byte

Is it "not multi-byte" or "multi-byte"?

_Flaviu

Sorry, is multi-byte .. .anyway, if the project is unicode or is multi-byte, is the same thing.

_Flaviu

Is obviously something in project settings, because I have tried this code in a new test project and goes fine as multi-byte project ... as unicode, the same result.

Victor Nijegorodov

Try these tests:

CStringA ansiText("TestA");
LPCSTR ansi = (LPCSTR)ansiText;
TRACE("%s\n", ansi);

CString someText("Test");
ansi = (LPCSTR)someText;
TRACE("%s\n", ansi);

What is the result?

_Flaviu

with the first try:

CStringA ansiText("TestA");
LPCSTR ansi = (LPCSTR)ansiText;
TRACE("%s\\n", ansi);

the result is TestA for the second try, I got an error:

1>d:\tempx\test\testdoc.cpp(53): error C2440: 'type cast' : cannot convert from 'CString' to 'LPCSTR'

at

CString someText("Test");
ansi = (LPCSTR)someText;    // <-- here is the error
TRACE("%s\\n", ansi);

The project is unicode.

Victor Nijegorodov

_Flaviu wrote:

for the second try, I got an error:

1>d:\tempx\test\testdoc.cpp(53): error C2440: 'type cast' : cannot convert from 'CString' to 'LPCSTR'

at

CString someText("Test");
ansi = (LPCSTR)someText; // <-- here is the error
TRACE("%s\n", ansi);

The project is unicode.

Of course you get the error since the CString contains the wide char text! Either change the build to be MBCS/ANSI or convert CString to wchar_t* (or use _T() macro).

Lost User

You cannot cast a CStingW (which is what the class will be in a Unicode environment) to an LPCSTR (which is const char*). You need to show again the actual failing code, and check the project settings.

_Flaviu

"build to be MBCS/ANSI" you meant multi-byte project ?

Lost User

Go to Project -> Properties -> General and make sure Character set is set to "Use Multi-Byte Charachter Set".

David Crow

_Flaviu wrote:

TRACE(">>>>>>>>>>>>>>>>>>>%s\n", chTemp);

What if you try:

TRACE(">>>>>>>>>>>>>>>>>>>%S\n", chTemp); // capital S

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