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Editorial Team
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Asked: 2026-06-16T10:24:01+00:00

first the code compiles and runs with VS2010 but when I compile with cl.exe

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first the code compiles and runs with VS2010

but when I compile with cl.exe it gives 

cannot convert parameter 1 from 'WCHAR [10]' to 'LPCTSTR'

the code is 

char *fileName = "12.txt";
WCHAR ufileName[10];
MultiByteToWideChar(CP_ACP, MB_COMPOSITE, fileName, -1, ufileName, 10);

postFile(ufileName, clientSock);
postFile(LPCTSTR lpFileName, SOCKET clientSock)
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1 Answer

  1. Editorial Team

    You’re trying to pass a WCHAR array to a function that expects a LPCTSTR. This article explains that LPCTSTR is an array of TCHARs and that TCHAR varies in size for unicode and non-unicode builds.

    Your code relies on sizeof(TCHAR) == sizeof(WCHAR) so you need unicode support to be enabled.

    I’d guess that your build from within the IDE enables unicode while your command line build doesn’t. You can enable unicode support by adding -DUNICODE -D_UNICODE to your command line.

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