mciSendString无法保存到目录路径

时间:2009-07-18 17:03:55

标签: c# mcisendstring

VS C#2008 SP1

我创建了一个记录和播放音频的小应用程序。但是,我的应用程序需要将wave文件保存到用户计算机上的应用程序数据目录中。

mciSendString将C样式字符串作为参数,并且必须是8.3格式。但是,我的问题是我无法保存。奇怪的是有时它会这样做,有时则不然。但是,大部分时间都是错误的。但是,如果我直接保存到C盘,它首次运行一切。我使用了下面编码的3种不同的方法。

失败时收到的错误号是286.“文件未保存。请确保您的系统有足够的磁盘空间或网络连接完好”

非常感谢任何建议,

[DllImport("winmm.dll",CharSet=CharSet.Auto)]
        private static extern uint mciSendString([MarshalAs(UnmanagedType.LPTStr)] string command,
                                                 StringBuilder returnValue,
                                                 int returnLength,
                                                 IntPtr winHandle);

        [DllImport("winmm.dll", CharSet = CharSet.Auto)]
        private static extern int mciGetErrorString(uint errorCode, StringBuilder errorText, int errorTextSize);

[DllImport("Kernel32.dll", CharSet=CharSet.Auto)]
        private static extern int GetShortPathName([MarshalAs(UnmanagedType.LPTStr)] string longPath,
                                                   [MarshalAs(UnmanagedType.LPTStr)] StringBuilder shortPath,
                                                    int length);






 // Stop recording
        private void StopRecording()
        {
            // Save recorded voice
            string shortPath = this.shortPathName();
            string formatShortPath = string.Format("save recsound \"{0}\"", shortPath);
            uint result = 0;
            StringBuilder errorTest = new StringBuilder(256);

            // C:\DOCUME~1\Steve\APPLIC~1\Test.wav
            // Fails
            result = mciSendString(string.Format("{0}", formatShortPath), null, 0, IntPtr.Zero);
            mciGetErrorString(result, errorTest, errorTest.Length);

            // command line convention - fails 
            result = mciSendString("save recsound \"C:\\DOCUME~1\\Steve\\APPLIC~1\\Test.wav\"", null, 0, IntPtr.Zero);
            mciGetErrorString(result, errorTest, errorTest.Length);         

            // 8.3 short format - fails
            result = mciSendString(@"save recsound C:\DOCUME~1\Steve\APPLIC~1\Test.wav", null, 0, IntPtr.Zero);
            mciGetErrorString(result, errorTest, errorTest.Length);

            // Save to C drive works everytime.
            result = mciSendString(@"save recsound C:\Test.wav", null, 0, IntPtr.Zero);
            mciGetErrorString(result, errorTest, errorTest.Length);

            mciSendString("close recsound ", null, 0, IntPtr.Zero);
        }


// Get the short path name so that the mciSendString can save the recorded wave file
        private string shortPathName()
        {
            string shortPath = string.Empty;
            long length = 0;
            StringBuilder buffer = new StringBuilder(256);

            // Get the length of the path 
            length = GetShortPathName(this.saveRecordingPath, buffer, 256);

            shortPath = buffer.ToString();

            return shortPath;
        }

2 个答案:

答案 0 :(得分:3)

我在C driveD drive中测试它,只要目录路径不包含空格,它就可以工作。 "C:\Test.wav""D:\mp3\test.wav"都有效,但"D:\mp4 folder\test.wav"不起作用。

答案 1 :(得分:1)

试试这个:

[ string directoryString =“C:\ DOCUME~1 \ Steve \ APPLIC~1 \”; Directory.SetCurrentDirectory(directoryString); mciSendString(@“save recsound Test.wav”,null,0,IntPtr.Zero); mciSendString(“close recsound”,null,0,IntPtr.Zero); ]