CoTaskMemAlloc的用法？

HRESULT CoTaskMemAlloc(
  [in] SIZE_T cb,
  [out] LPVOID *ppv
);

#include<windows.h>
#include <comdef.h>
#include<stdio.h>

int main() {
    // 分配内存
    LPVOID pMemory = NULL;
    HRESULT hr = CoTaskMemAlloc(100, &pMemory);
    if (SUCCEEDED(hr)) {
        printf("Memory allocated at address %p\n", pMemory);

        // 在这里使用分配的内存

        // 释放内存
        CoTaskMemFree(pMemory);
    } else {
        printf("Failed to allocate memory (error 0x%lx)\n", hr);
    }

    return 0;
}