如何在qt下开发usb通讯程序需要加载usb芯片的dll文件 [复制链接]

环境：vc2003 +xp+qt4.2.1
由于需要qt下usb开发 芯片公司提供了 dll文件以及 .lib  .h文件 说明文件 都在附件中
问题1：    QLibrary lib("mpusbapi");
   
    if(lib.isLibrary("mpusbapi"))
    {
        ui.textEdit->append("mpusbapi is load");
    }
    else
    {
        ui.textEdit->append("mpusbapi not load");
    }
使用上面代码时候提示 mpusbapi not load
问题2：按照说明文件 在引入#include "mpusbapi.h" 后
提示： DWORD (*MPUSBGetDLLVersion)(void); 类似于这样的 DWORD类型无法编译

在vc下面 可以编译及使用在qt下面怎么加载以及使用dll 阿

救急阿谢谢各位了

问题1已经解决 原来是 需要QLibrary lib("mpusbapi.dll"); 
第二个问题 怎么解决阿 谢谢各位了

自己typedef一个DWORD，或者将windows.h头文件加进去 。

现在已经可以编译了There are two ways to link the DLL to your project:

a) Load-time Linking

  Simply add the mpusbapi.lib file to your project.
  The mpusbapi.lib file provided is specific to the Borland C++
  compiler. The mpusbapi.dll is compiler independent. If a different
  compiler is used, however, the DLL must be re-compiled to generate
  a new mpusbapi.lib specific to that compiler.

  C++ source code for MPUSBAPI is provided.
 
  The _mpusbapi.h file must be included in every file that uses
  the MPUSBAPI functions.

  The mpusbapi.dll file must be in the same directory as the
  executable file.

b) Run-time Linking

  Run-time Linking does not require the .lib file. It only requires
  the .dll file. Linking the functions is, however, a little more
  complicated. An example is provided showing how to use Win32
  API functions to load a DLL.

  The mpusbapi.h file (note, no "_") must be included in every file
  that uses the MPUSBAPI functions.

  The mpusbapi.dll is not required to be in the same directory as
  the executable file.
按照这两段说明 应该是使用第二种方法才对 可是 加载 mpusbapi.h 后 出现错误

错误提示

加载 _mpusbapi.h  在加载项目属性中加入mpusbapi.dll  后就穿了1 处的错误 。。。

1标注  处  加载 windows.h 和 qt_windows.h 错误相同