CreateProcess执行EXE

Question

我有一个应用程序，用户将文件上传到远程服务器，接收此文件的同一服务器应运行此应用程序。我使用的是CreateProcess方法。问题是，文件目录已经在std :：string中定义了，我很难将这个目录作为参数传递给CreateProcess。

如何确保将此目录传递给CreateProcess时不会出现错误？

    //the client remotely sends the directory where the file will be saved
    socket_setup.SEND_BUFFER("\nRemote directory for upload: ");
    char *dirUP_REMOTE = socket_setup.READ_BUFFER();
    std::string DIRETORIO_UP = dirUP_REMOTE; // variable where it stores the remote directory


        //after uploading this is validation for executing file
if (!strcmp(STRCMP_EXECUTE, EXECUTE_TIME_YES))
{
    STARTUPINFO si;
    PROCESS_INFORMATION pi;
    ZeroMemory( &si, sizeof(si) );
    si.cb = sizeof(si);
    ZeroMemory( &pi, sizeof(pi) );

    std::wstring wdirectory;
    int slength = (int)directory.length() + 1;
    int len = MultiByteToWideChar(CP_ACP, 0, directory.c_str(), slength, 0, 0);
    wdirectory.resize(len);
    MultiByteToWideChar(CP_ACP, 0, directory.c_str(), slength, &wdirectory[0], len);
    if (!CreateProcess(NULL, wdirectory.c_str(), NULL, NULL, FALSE, 0, NULL, NULL, &si, &pi));
}

Answer 1

CreateProcess有两个版本: CreateProcessA和CreateProcessW (就像大多数类似的windows APIs一样)。是否使用正确的版本取决于您是否启用了Unicode。这里，您需要首先将std::string转换为std::wstring，因为CreateProcess实际上是一个CreateProcessW。

std::wstring wdirectory;
int slength = (int)directory.length() + 1;
int len = MultiByteToWideChar(CP_ACP, 0, directory.c_str(), slength, 0, 0); 
wdirectory.resize(len);
MultiByteToWideChar(CP_ACP, 0, directory.c_str(), slength, &wdirectory[0], len);
//...
if (!CreateProcess(NULL,(LPWSTR)wdirectory.c_str(), NULL, NULL, FALSE, 0, NULL, NULL, &si, &pi));

您也可以尝试用手动调用CreateProcessA并传递cstring来替换CreateProcess，就像您在问题中尝试做的那样，但是您将不支持宽字符：

if (!CreateProcessA(NULL, directory.c_str(), NULL, NULL, FALSE, 0, NULL, NULL, &si, &pi));