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Error C2664 Const Char Lpcwstr

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Cannot Convert From 'const Char [14]' To 'lpcwstr'

only takes a minute: Sign up cannot convert parameter 1 from 'char' to 'LPCWSTR' up vote 21 down vote favorite 10 I keep getting this error: cannot convert parameter 1 from 'char' to 'LPCWSTR' int main(int argc, char argv[]) { // open port for I/O HANDLE h = CreateFile(argv[1],GENERIC_READ|GENERIC_WRITE,0,NULL,OPEN_EXISTING,0,NULL); if(h == INVALID_HANDLE_VALUE) { PrintError("E012_Failed to open port"); can someone help? how to convert const char to lpctstr in c++ c++ windows createfile lpcwstr share|improve this question edited Jun 8 '15 at 22:40 Joseph Stine 9551921 asked Oct 13 '10 at 14:45 sebastian 53361433 add a comment| 5 Answers 5 active oldest votes up vote 7 down vote accepted It should be int main(int argc, char* argv[]) And HANDLE h = CreateFileA(argv[1],GENERIC_READ|GENERIC_WRITE,0,NULL,OPEN_EXISTING,0,NULL); share|improve this answer answered Oct 13 '10 at 14:51 ybungalobill 37.6k1074136 1 I don't thing using the ANSI version of CreateFile is the right way to go, next thing you know and he'll start changing all the function calls to use the ANSI version. –Nikola Smiljanić Oct 13 '10 at 15:00 1 @Nikola: Of course it's the wrong way! I just think that it's not appropriate to explain the difference between char, wchat_t, TCHAR and how to write correct unicode applications to an absolute beginner. –ybungalobill Oct 13 '10 at 15:04 add a comment| up vote 85 down vote Go to the Properties for your Project and under Configuration Properties/General, change the Character Set to "Not Set". This way, the compiler will not a

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Lpcwstr C++

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Cannot Convert Parameter 1 From 'char *' To 'lpcwstr'

a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up cannot convert parameter 1 from 'const char *' to 'LPCWSTR' up vote 3 down http://stackoverflow.com/questions/3924926/cannot-convert-parameter-1-from-char-to-lpcwstr vote favorite 1 Basically I have some simple code that does some things for files and I'm trying to port it to windows. I have something that looks like this: int SomeFileCall(const char * filename){ #ifndef __unix__ SomeWindowsFileCall(filename); #endif #ifdef __unix__ /**** Some unix only stat code here! ****/ #endif } the line SomeWindowsFileCall(filename); causes the compiler error: cannot convert parameter 1 from 'const char *' to 'LPCWSTR' How do http://stackoverflow.com/questions/10727568/cannot-convert-parameter-1-from-const-char-to-lpcwstr I fix this, without changing the SomeFileCall prototype? c winapi cross-platform share|improve this question asked May 23 '12 at 20:45 john-charles 5852821 LPCWSTR is const wchar_t * - which is a wide character string. –Mysticial May 23 '12 at 20:48 See Working with Strings for more details. –Adam Rosenfield May 23 '12 at 20:50 possible duplicate of cannot convert parameter 1 from 'char *' to 'LPCWSTR' –outis Jul 9 '12 at 19:42 add a comment| 4 Answers 4 active oldest votes up vote 8 down vote accepted Most of the Windows APIs that take strings have two versions: one that takes char * and one that takes WCHAR * (that latter is equivalent to wchar_t *). SetWindowText, for example, is actually a macro that expands to either SetWindowTextA (which takes char *) or SetWindowTextW (which takes WCHAR *). In your project, it sounds like all of these macros are referencing the -W versions. This is controlled by the UNICODE preprocessor macro (which is defined if you choose the "Use Unicode Character Set" project option in Visual Studio). (Some of Microsoft's C and C++ run time library functions also have ANSI and wide versions. Which one you get is selected by the similar

here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about http://stackoverflow.com/questions/14370982/converting-const-char-to-lpctstr-for-createdirectory Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is http://www.scientificpsychic.com/blogentries/error-c2664-loadlibraryw-cannot-convert-parameter-to-lpcwstr.html a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Converting 'const char*' to 'LPCTSTR' for CreateDirectory up vote 2 down vote favorite #include const char "stdafx.h" #include #include using namespace std; int main() { string FilePath = "C:\\Documents and Settings\\whatever"; CreateDirectory(FilePath, NULL); return 0; } Error: error C2664: 'CreateDirectory' : cannot convert parameter 1 from 'const char *' to 'LPCTSTR' How do I make this conversion? The next step is to set today's date as a string or char and concatenate it with the filepath. Will this change how I do step 1? const char to I am terrible at data types and conversions, is there a good explanation for 5 year olds out there? c++ c2664 share|improve this question asked Jan 17 '13 at 1:49 ProGirlXOXO 3902718 1 I'd hate to break this to ya but C++ wasn't geared toward 5-year-olds. :( –Mehrdad Jan 17 '13 at 1:58 And neither was API programming. –Remy Lebeau Jan 17 '13 at 2:06 add a comment| 2 Answers 2 active oldest votes up vote 1 down vote accepted std::string is a class that holds char-based data. To pass a std::string data to API functions, you have to use its c_str() method to get a char* pointer to the string's actual data. CreateDirectory() takes a TCHAR* as input. If UNICODE is defined, TCHAR maps to wchar_t, otherwise it maps to char instead. If you need to stick with std::string but do not want to make your code UNICODE-aware, then use CreateDirectoryA() instead, eg: #include "stdafx.h" #include #include int main() { std::string FilePath = "C:\\Documents and Settings\\whatever"; CreateDirectoryA(FilePath.c_str(), NULL); return 0; } To make this code TCHAR-aware, you can do this instead: #include "stdafx.h" #include #include int main() { std::basic_string FilePath = TEXT("C:\\Documents and Settings\\whatever"); CreateDirectory(FilePath.c_str(), NULL); return 0; } However, Ansi-based

Verbs Diet Index 2010-03-28 Error C2664 LoadLibraryW cannot convert parameter to LPCWSTR I recently used Microsoft Visual Studio 2008 to write a simple program to load a dynamic link library (DLL) module and invoke some of its entry points. I did not expect to get the error message C2664 from the simple LoadLibrary statement:HINSTANCE hinstLib = LoadLibrary("azspellaid.dll"); Error C2664: 'LoadLibraryW': cannot convert parameter 1 from 'const char [15]' to 'LPCWSTR' There are two ways of fixing this problem. The first one is to cast the quoted string with a Long Pointer to Const Wide String (LPCWSTR):HINSTANCE hinstLib = LoadLibrary((LPCWSTR)L"azspellaid.dll"); The C2664 error can also be resolved by keeping the original code and changing the character set of the project defaults from "unicode character set" to "multi-byte character set" as shown in this image: © Copyright2012 - Antonio Zamora

 

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