| 大家都知道，MP3、MID、WAV、WMA等格式的音频文件可以通过调用底层函数来实现播放的！ 在这里，我介绍利用自己编制的音频解码器来播放音乐的例子，其中，已经将解码器封装到了动态库里，只给出了接口函数及调用规则！ 动态库头文件为： //打开音频文件 pathname为文件路径名
int __stdcall opensong (char *pathname); //播放音频文件 position为播放的起始位置
int __stdcall playsong (char *pathname, int position); //暂停播放
int __stdcall pausesong (char *pathname); //停止播放，并关闭设备
int __stdcall stopsong (char *pathname); //播放状态 kind 0:所播放文件的长度 1：播放状态，为"playing,pause,stoped"等 2：播放的进度，以毫秒计
int __stdcall statussong (char *pathname, int kind, char *status); //关于对话框
void about(void);
应用程序界面为： 程序代码为： #include
#include
#include
#include "exe.h"
#include "mci.h" static char pathname[MAX_PATHNAME_LEN]; static int panelHandle; int __stdcall WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPSTR lpszCmdLine, int nCmdShow)
{
if (InitCVIRTE (hInstance, 0, 0) == 0)
return -1; /* out of memory */
if ((panelHandle = LoadPanel (0, "exe.uir", PANEL)) < 0)
return -1;
DisplayPanel (panelHandle);
RunUserInterface ();
DiscardPanel (panelHandle);
return 0;
} int CVICALLBACK OkCallback (int panel, int control, int event,
void *callbackData, int eventData1, int eventData2)
{
int status;
char mode[128];
switch (event)
{
case EVENT_COMMIT:
status = FileSelectPopup ("", "*.mp3", "*.mp3;*.wav;*.mid;*.wma", "打开音频文件", VAL_OK_BUTTON, 0, 0, 1, 1, pathname);
opensong(pathname);
playsong(pathname, 0);
statussong(pathname, 1, mode);
SetCtrlVal (panelHandle, PANEL_STRING, mode);
break;
}
return 0;
} int CVICALLBACK QuitCallback (int panel, int control, int event,
void *callbackData, int eventData1, int eventData2)
{
switch (event)
{
case EVENT_COMMIT:
QuitUserInterface (0);
break;
}
return 0;
} int CVICALLBACK stop (int panel, int control, int event,
void *callbackData, int eventData1, int eventData2)
{
char status[128];
switch (event)
{
case EVENT_COMMIT:
stopsong(pathname);
statussong(pathname, 1, status);
SetCtrlVal (panelHandle, PANEL_STRING, status);
break;
}
return 0;
} int CVICALLBACK pause (int panel, int control, int event,
void *callbackData, int eventData1, int eventData2)
{
char status[128];
switch (event)
{
case EVENT_COMMIT:
pausesong(pathname);
statussong(pathname, 1, status);
SetCtrlVal (panelHandle, PANEL_STRING, status);
break;
}
return 0;
} int CVICALLBACK continu (int panel, int control, int event,
void *callbackData, int eventData1, int eventData2)
{
char status[128];
int position = 0;
switch (event)
{
case EVENT_COMMIT:
status[0] = '\0';
statussong(pathname, 2, status);
Fmt(&position, "%i<%s", status);
playsong(pathname, position);
status[0] = '\0';
statussong(pathname, 1, status);
SetCtrlVal (panelHandle, PANEL_STRING, status);
break;
}
return 0;
} int CVICALLBACK pre (int panel, int control, int event,
void *callbackData, int eventData1, int eventData2)
{
char status[128];
int position;
switch (event)
{
case EVENT_COMMIT:
statussong(pathname, 1, status);
SetCtrlVal (panelHandle, PANEL_STRING, status);
statussong(pathname, 2, status);
Fmt (&position, "%i<%s", status);
position += 5000;
playsong(pathname, position);
break;
}
return 0;
} int CVICALLBACK back (int panel, int control, int event,
void *callbackData, int eventData1, int eventData2)
{
char status[128];
int position;
switch (event)
{
case EVENT_COMMIT:
statussong(pathname, 1, status);
SetCtrlVal (panelHandle, PANEL_STRING, status);
statussong(pathname, 2, status);
Fmt (&position, "%i<%s", status);
position -= 5000;
playsong(pathname, position);
break;
}
return 0;
} int CVICALLBACK len (int panel, int control, int event,
void *callbackData, int eventData1, int eventData2)
{
char status[128];
switch (event)
{
case EVENT_COMMIT:
statussong(pathname, 0, status);
SetCtrlVal (panelHandle, PANEL_STRING, status);
break;
}
return 0;
} int CVICALLBACK aboutme (int panel, int control, int event,
void *callbackData, int eventData1, int eventData2)
{
switch (event)
{
case EVENT_COMMIT:
about();
break;
}
return 0;
}
 KLcmHkHw.rar (38.21 KB)
转自：小信的博客 网址：http://blog.sina.com.cn/u/1265070197
[此贴子已经被作者于2006-12-9 12:52:46编辑过] | 
