使用js-ctypes，我如何从Windows ReadFile检索输出？ [英] Using js-ctypes, how do I retrieve output from Windows ReadFile?

问题描述

我正在使用（虽然对lpBuffer - > char.ptr不太确定）
$ b $ pre $ 让readFile = kernel32。 declare（
ReadFile，
ctypes.winapi_abi，
ctypes.int32_t，// bool //返回类型：1表示成功，0失败
ctypes.voidptr_t，// in：hObject
ctypes.char.ptr，// out：lpBuffer
ctypes.uint32_t，// in：lpNumberOfBytesRead
ctypes.uint32_t.ptr，// out：lpNumberOfBytesWritten
ctypes.voidptr_t.ptr // inout：lpOverlapped
）;


for

  BOOL WINAPI ReadFile（
 _In_ HANDLE hFile，
 _Out_ LPVOID lpBuffer，
 _In_ DWORD nNumberOfBytesToRead，
 _Out_opt_ LPDWORD lpNumberOfBytesRead，
 _Inout_opt_ LPOVERLAPPED lpOverlapped 
）; 
  

然而，当我尝试的时候

  let output = ctypes.char.array（1024）; 
 let isRead = readFile（hFile，output，1024，bytesWritten.address（））
  

我得到

JPM [error]消息：TypeError：无法将ctypes.char.array（1024）
传递给参数2的int32_t ReadFile（void *，char *，uint32_t，void **）

更多尝试。

  let output = ctypes.char.array（1024）; 
 let isRead = readFile（hFile，output.ptr，1024，bytesWritten.address（））
  

< blockquote>

JPM [error]消息：TypeError：无法通过
ctypes.char.array（1024）.ptr到int32_t的参数2 ReadFile（void *，
char *，uint32_t，void **

  let output = ctypes.char.array（1024） ; 
 let isRead = readFile（hFile，output.address（），1024，bytesWritten.address（））
  

JPM [error]消息：TypeError：output.address不是函数

 let output = ctypes.char.ptr; 
 let isRead = readFile（hFile，output，1024，bytesWritten.address（））
  

JPM [error]消息：TypeError：无法将ctypes.char.ptr传递给
参数2 int32_t ReadFile（void *，char *，uint32_t，v oid **）

解决方案

狂它工作

  let outputType = ctypes.char.array（1024）; 
 let output = outputType（）; 
 let isRead = readFile（hFile，output，1024，bytesWritten.address（），null）; 
  

I'm using (while not being quite sure about lpBuffer -> char.ptr)

  let readFile = kernel32.declare(
    "ReadFile",
    ctypes.winapi_abi,
    ctypes.int32_t,     //bool  // return type: 1 indicates success, 0 failure
    ctypes.voidptr_t,   // in: hObject
    ctypes.char.ptr,  // out: lpBuffer
    ctypes.uint32_t,    // in: lpNumberOfBytesRead
    ctypes.uint32_t.ptr,    // out: lpNumberOfBytesWritten
    ctypes.voidptr_t.ptr    // inout: lpOverlapped
  );

for

BOOL WINAPI ReadFile(
  _In_        HANDLE       hFile,
  _Out_       LPVOID       lpBuffer,
  _In_        DWORD        nNumberOfBytesToRead,
  _Out_opt_   LPDWORD      lpNumberOfBytesRead,
  _Inout_opt_ LPOVERLAPPED lpOverlapped
);

However, when I try

  let output = ctypes.char.array(1024);
  let isRead = readFile(hFile, output, 1024, bytesWritten.address())

I get

JPM [error] Message: TypeError: can't pass ctypes.char.array(1024) to argument 2 of int32_t ReadFile(void*, char*, uint32_t, void**)

More attempts.

  let output = ctypes.char.array(1024);
  let isRead = readFile(hFile, output.ptr, 1024, bytesWritten.address())

JPM [error] Message: TypeError: can't pass ctypes.char.array(1024).ptr to argument 2 of int32_t ReadFile(void*, char*, uint32_t, void**

  let output = ctypes.char.array(1024);
  let isRead = readFile(hFile, output.address(), 1024, bytesWritten.address())

JPM [error] Message: TypeError: output.address is not a function

  let output = ctypes.char.ptr;
  let isRead = readFile(hFile, output, 1024, bytesWritten.address())

JPM [error] Message: TypeError: can't pass ctypes.char.ptr to argument 2 of int32_t ReadFile(void*, char*, uint32_t, v oid**)

解决方案

This made it work

  let outputType = ctypes.char.array(1024);
  let output = outputType();
  let isRead = readFile(hFile, output, 1024, bytesWritten.address(), null);

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