构建 DLL 时出现 C++ 错误：const wchar_t* 类型的参数与 LPWSTR 类型的参数不兼容

Question

I am a complete novice to C++ programming.

I need to create a DLL using header and solution files that were provided in a tutorial. I have followed basic steps from here but, I am getting following errors in the solution file:

L111 !CreateProcess(L".\\\\phreeqc\\\\phreeqc.exe",

L112 TEXT(".\\\\phreeqc\\\\phreeqc.exe .\\\\phreeqc\\\\phreeqc_input.txt .\\\\phreeqc\\\\phreeqc_input.out .\\\\phreeqc\\\\wateq4f_plus.dat")

Errors:

L111

C2664 'BOOL CreateProcessW(LPCWSTR,LPWSTR,LPSECURITY_ATTRIBUTES,LPSECURITY_ATTRIBUTES,BOOL,DWORD,LPVOID,LPCWSTR,LPSTARTUPINFLOW,LPPROCESS_INFORMATION)': cannot convert argument 2 from 'const wchar_t[105]' to 'LPWSTR'

L112

E0167 argument of type "const wchar_t*" is incompatible with parameter of type "LPWSTR".

I understand that the specifics in the above lines of code will not mean much to many of you but I am hoping that someone can at least understand the C++ error and help out here.

Answer 1

The Unicode version of CreateProcess (which is a macro that maps to CreateProcessW ) requires a writable string for the lpCommandLine parameter, and string literals are const . You therefore cannot pass a string literal directly for this parameter.

Instead, you can change your code like so:

WCHAR lpCommandLine [] = L"...";
BOOL ok = CreateProcess (L"your_application_name_here", lpCommandLine, ...);

Documentation here