修改命令行参数 [英] Modify Command Line Arguments

问题描述

我有一个Win32 C ++应用程序，我需要在该应用程序中修改命令行参数。具体来说，我想以这样的方式编辑命令行参数： GetCommandLineW（）返回我的新参数。

I have a Win32 C++ application and I need to modify the command line arguments in the application. Specifically, I want to edit the command line arguments in such a way that GetCommandLineW() returns my new arguments.

信不信由你，这行得通（因为我们有一个指向字符数组的非常量指针）：

Believe it or not, this works (since we have a non-const pointer to the character array):

LPTSTR args = GetCommandLineW();
LPTSTR new_args = L"foo --bar=baz";
wmemcpy(args, new_args, lstrlenW(new_args));

// ...
LPTSTR args2 = GetGommentLineW(); // <- equals "foo --bar=baz"

但是我不知道如何Windows为 GetCommandLineW（）提供的 LPTSTR 分配了长内存。

But I don't know how long much memory Windows allocates for the LPTSTR provided by GetCommandLineW().

还有另一种方法吗？还是有人知道命令行参数是否分配了可预测的内存？

Is there another way to do this? Or does anyone know if there is a predictable amount of memory allocated for the command line arguments?

推荐答案

GetCommandLineW（）不分配任何内存。它只是返回一个指针，该指针指向操作系统在进程的 PEB 结构在创建过程时出现。该缓冲区存在于整个过程的生命周期中。

GetCommandLineW() does not allocate any memory. It simply returns a pointer to a buffer that is allocated by the OS in the process's PEB structure when the process is created. That buffer exists for the lifetime of the process.

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