g++ 链接库编译

Question

我是 g++ 的新手，正在尝试编译/运行在此页面上找到的示例 c++ 代码： https://docs.microsoft.com/en-us/windows/desktop/psapi/enumerating-all-processes

用

编译代码

g++ -o ex.exe ex.cpp

不起作用，所以我很确定我遗漏了一些东西，比如我需要 link Psapi 库，或者如代码所述 "add Psapi.lib to TARGETLIBS"。我下载了所有#included 头文件并将它们放在同一目录中，但是使用上面的 g++ 行编译文件会导致以下错误，这让我觉得我忘记了 g++ 行中的某些内容以包含必要的 psapi 库

undefined reference to `EnumProcessModules@16'
undefined reference to `GetModuleBaseNameA@16'
undefined reference to `EnumProcesses@12'

代码：

#include <windows.h>
#include <stdio.h>
#include <tchar.h>
#include <psapi.h>

// To ensure correct resolution of symbols, add Psapi.lib to TARGETLIBS
// and compile with -DPSAPI_VERSION=1

void PrintProcessNameAndID( DWORD processID )
{
    TCHAR szProcessName[MAX_PATH] = TEXT("<unknown>");

    // Get a handle to the process.

    HANDLE hProcess = OpenProcess( PROCESS_QUERY_INFORMATION |
                                   PROCESS_VM_READ,
                                   FALSE, processID );

    // Get the process name.

    if (NULL != hProcess )
    {
        HMODULE hMod;
        DWORD cbNeeded;

        if ( EnumProcessModules( hProcess, &hMod, sizeof(hMod), 
             &cbNeeded) )
        {
            GetModuleBaseName( hProcess, hMod, szProcessName, 
                               sizeof(szProcessName)/sizeof(TCHAR) );
        }
    }

    // Print the process name and identifier.

    _tprintf( TEXT("%s  (PID: %u)\n"), szProcessName, processID );

    // Release the handle to the process.

    CloseHandle( hProcess );
}

int main( void )
{
    // Get the list of process identifiers.

    DWORD aProcesses[1024], cbNeeded, cProcesses;
    unsigned int i;

    if ( !EnumProcesses( aProcesses, sizeof(aProcesses), &cbNeeded ) )
    {
        return 1;
    }


    // Calculate how many process identifiers were returned.

    cProcesses = cbNeeded / sizeof(DWORD);

    // Print the name and process identifier for each process.

    for ( i = 0; i < cProcesses; i++ )
    {
        if( aProcesses[i] != 0 )
        {
            PrintProcessNameAndID( aProcesses[i] );
        }
    }

    return 0;
}

Answer 1

您忘记link您的图书馆。尝试编译：

g++ ex.cpp -lPsapi -DPSAPI_VERSION=1 -o ex.exe

g++ 链接库编译

g++ compilation with linked libraries

c++

g++

libraries

.lib

psapi