本文主要是介绍windows 程序设计之「RECORD2.C」范例分析笔记，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
/*----------------------------------------
RECORD2.C -- Waveform Audio Recorder
(c) Charles Petzold, 1998
------------------------------------------*/
#include <windows.h>
#include "..//record1//resource.h" // RECORD1.C 中的资源标识符头文件
BOOL CALLBACK DlgProc (HWND, UINT, WPARAM, LPARAM) ;
TCHAR szAppName [] = TEXT ("Record2") ;
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
if (-1 == DialogBox (hInstance, TEXT ("Record"), NULL, DlgProc))
{
MessageBox (NULL, TEXT ("This program requires Windows NT!"),
szAppName, MB_ICONERROR) ;
}
return 0 ;
}
void ShowError (HWND hwnd, DWORD dwError)
{
TCHAR szErrorStr [1024] ;
mciGetErrorString (dwError, szErrorStr,
sizeof (szErrorStr) / sizeof (TCHAR)) ;
MessageBeep (MB_ICONEXCLAMATION) ;
MessageBox (hwnd, szErrorStr, szAppName, MB_OK | MB_ICONEXCLAMATION) ;
}
BOOL CALLBACK DlgProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static BOOL bRecording, bPlaying, bPaused ;
static TCHAR szFileName[] = TEXT ("record2.wav") ;
static WORD wDeviceID ;
DWORD dwError ;
MCI_GENERIC_PARMS mciGeneric ;
MCI_OPEN_PARMS mciOpen ;
MCI_PLAY_PARMS mciPlay ;
MCI_RECORD_PARMS mciRecord ;
MCI_SAVE_PARMS mciSave ;
switch (message)
{
case WM_COMMAND:
switch (wParam)
{
case IDC_RECORD_BEG:
// 删除现有的波形文件
DeleteFile (szFileName) ;
// 设置MCI_OPEN_PARMS结构
// dwCallback 低位字指定一个窗口句柄；用于MCI_NOTIFY旗标
mciOpen.dwCallback = 0 ;
// 调用后用于记录使用的设备标识符
mciOpen.wDeviceID = 0 ;
// 常数标识符名称或设备类型
mciOpen.lpstrDeviceType = TEXT ("waveaudio") ;
// 设备元件（通常是一个路径）
mciOpen.lpstrElementName = TEXT ("") ;
// 可选设备别名
mciOpen.lpstrAlias = NULL ;
// MCI_OPEN 初始化一个设备或文件
dwError = mciSendCommand (0, MCI_OPEN,
// MCI_WAIT 指导设备的等待，直到完成所要求的行动才返回控制权
// MCI_OPEN_TYPE 表示要使用MCI_OPEN_PARMS结构中的LpstrDiviceType参数
// MCI_OPEN_ELEMENT 表示LpstrDeviceType参数中的是设备表述字符串
// 还可以使用 MCI_OPEN_TYPE_ID 表示LpstrDeviceType参数中的是设备标识符
MCI_WAIT | MCI_OPEN_TYPE | MCI_OPEN_ELEMENT,
// 指向一个结构，它包含命令的消息参数
(DWORD) (LPMCI_OPEN_PARMS) &mciOpen) ;
if (dwError != 0)
{
ShowError (hwnd, dwError) ;
return TRUE ;
}
// 储存设备ID
wDeviceID = mciOpen.wDeviceID ;
// 设置用于录制的命令数据
// dwCallback 低位字指定一个窗口句柄；用于MCI_NOTIFY旗标
mciRecord.dwCallback = (DWORD) hwnd ;
mciRecord.dwFrom = 0 ;
mciRecord.dwTo = 0 ;
// MCI_RECORD 启动录音功能
// MCI_NOTIFY 旗标导致录音结束后系统向mciRecord.dwCallback元素中指定的窗口句柄发送一条MM_MCINOTIFY通知消息
mciSendCommand (wDeviceID, MCI_RECORD, MCI_NOTIFY,
(DWORD) (LPMCI_RECORD_PARMS) &mciRecord) ;
// 设置按钮是否有效和当前焦点
EnableWindow (GetDlgItem (hwnd, IDC_RECORD_BEG), FALSE);
EnableWindow (GetDlgItem (hwnd, IDC_RECORD_END), TRUE) ;
EnableWindow (GetDlgItem (hwnd, IDC_PLAY_BEG), FALSE);
EnableWindow (GetDlgItem (hwnd, IDC_PLAY_PAUSE), FALSE);
EnableWindow (GetDlgItem (hwnd, IDC_PLAY_END), FALSE);
SetFocus (GetDlgItem (hwnd, IDC_RECORD_END)) ;
bRecording = TRUE ;
return TRUE ;
case IDC_RECORD_END:
// 停止录音
mciGeneric.dwCallback = 0 ;
// MCI_STOP 命令消息用于停止先前的录音命令
mciSendCommand (wDeviceID, MCI_STOP, MCI_WAIT,
(DWORD) (LPMCI_GENERIC_PARMS) &mciGeneric) ;
// 保存声音文件
mciSave.dwCallback = 0 ;
mciSave.lpfilename = szFileName ;
// MCI_SAVE 命令用于对先前录制在临时文件中的声音文件进行保持
// MCI_SAVE_FILE 指出保存的文件名在mciSave.lpfilename元素中指定
mciSendCommand (wDeviceID, MCI_SAVE, MCI_WAIT | MCI_SAVE_FILE,
(DWORD) (LPMCI_SAVE_PARMS) &mciSave) ;
// 关闭打开的设备
// MCI_CLOSE命令消息用于删除所有的临时文件、释放已经建立的内存块并关闭设备
mciSendCommand (wDeviceID, MCI_CLOSE, MCI_WAIT,
(DWORD) (LPMCI_GENERIC_PARMS) &mciGeneric) ;
// 设置按钮是否有效和当前焦点
EnableWindow (GetDlgItem (hwnd, IDC_RECORD_BEG), TRUE) ;
EnableWindow (GetDlgItem (hwnd, IDC_RECORD_END), FALSE);
EnableWindow (GetDlgItem (hwnd, IDC_PLAY_BEG), TRUE) ;
EnableWindow (GetDlgItem (hwnd, IDC_PLAY_PAUSE), FALSE);
EnableWindow (GetDlgItem (hwnd, IDC_PLAY_END), FALSE);
SetFocus (GetDlgItem (hwnd, IDC_PLAY_BEG)) ;
// 录音进行中标记
bRecording = FALSE ;
return TRUE ;
case IDC_PLAY_BEG:
// 打开波形音频
mciOpen.dwCallback = 0 ;
mciOpen.wDeviceID = 0 ;
mciOpen.lpstrDeviceType = NULL ;
mciOpen.lpstrElementName = szFileName ;
mciOpen.lpstrAlias = NULL ;
// MCI_OPEN_ELEMENT 标记表示lpstrElementName字段是一个有效的文件名
dwError = mciSendCommand (0, MCI_OPEN,
MCI_WAIT | MCI_OPEN_ELEMENT,
(DWORD) (LPMCI_OPEN_PARMS) &mciOpen) ;
if (dwError != 0)
{
ShowError (hwnd, dwError) ;
return TRUE ;
}
// Save the device ID
wDeviceID = mciOpen.wDeviceID ;
// Begin playing
mciPlay.dwCallback = (DWORD) hwnd ;
mciPlay.dwFrom = 0 ;
mciPlay.dwTo = 0 ;
// 播放波形音频文件
// MCI_NOTIFY 旗标导致播放结束后系统向mciPlay.dwCallback元素中指定的窗口句柄发送一条MM_MCINOTIFY通知消息
mciSendCommand (wDeviceID, MCI_PLAY, MCI_NOTIFY,
(DWORD) (LPMCI_PLAY_PARMS) &mciPlay) ;
// Enable and disable buttons
EnableWindow (GetDlgItem (hwnd, IDC_RECORD_BEG), FALSE);
EnableWindow (GetDlgItem (hwnd, IDC_RECORD_END), FALSE);
EnableWindow (GetDlgItem (hwnd, IDC_PLAY_BEG), FALSE);
EnableWindow (GetDlgItem (hwnd, IDC_PLAY_PAUSE), TRUE) ;
EnableWindow (GetDlgItem (hwnd, IDC_PLAY_END), TRUE) ;
SetFocus (GetDlgItem (hwnd, IDC_PLAY_END)) ;
bPlaying = TRUE ;
return TRUE ;
case IDC_PLAY_PAUSE:
// 如果暂停按钮之前没有被按下则执行暂停操作
if (!bPaused)
{
mciGeneric.dwCallback = 0 ;
// 发出暂停指令
mciSendCommand (wDeviceID, MCI_PAUSE, MCI_WAIT,
(DWORD) (LPMCI_GENERIC_PARMS) & mciGeneric);
// 设置暂停按钮字样
SetDlgItemText (hwnd, IDC_PLAY_PAUSE, TEXT ("Resume")) ;
// 标记暂停被按下
bPaused = TRUE ;
}
// 否者执行继续播放操作
else
{
mciPlay.dwCallback = (DWORD) hwnd ;
mciPlay.dwFrom = 0 ;
mciPlay.dwTo = 0 ;
// MCI_NOTIFY 旗标导致播放结束后系统向mciPlay.dwCallback元素中指定的窗口句柄发送一条MM_MCINOTIFY通知消息
mciSendCommand (wDeviceID, MCI_PLAY, MCI_NOTIFY,
(DWORD) (LPMCI_PLAY_PARMS) &mciPlay) ;
SetDlgItemText (hwnd, IDC_PLAY_PAUSE, TEXT ("Pause")) ;
bPaused = FALSE ;
}
return TRUE ;
case IDC_PLAY_END:
// 停止播放，并关闭设备
mciGeneric.dwCallback = 0 ;
mciSendCommand (wDeviceID, MCI_STOP, MCI_WAIT,
(DWORD) (LPMCI_GENERIC_PARMS) &mciGeneric) ;
mciSendCommand (wDeviceID, MCI_CLOSE, MCI_WAIT,
(DWORD) (LPMCI_GENERIC_PARMS) &mciGeneric) ;
// Enable and disable buttons
EnableWindow (GetDlgItem (hwnd, IDC_RECORD_BEG), TRUE) ;
EnableWindow (GetDlgItem (hwnd, IDC_RECORD_END), FALSE);
EnableWindow (GetDlgItem (hwnd, IDC_PLAY_BEG), TRUE) ;
EnableWindow (GetDlgItem (hwnd, IDC_PLAY_PAUSE), FALSE);
EnableWindow (GetDlgItem (hwnd, IDC_PLAY_END), FALSE);
SetFocus (GetDlgItem (hwnd, IDC_PLAY_BEG)) ;
// 播放进行中标记
bPlaying = FALSE ;
bPaused = FALSE ;
return TRUE ;
}
break ;
case MM_MCINOTIFY:
switch (wParam)
{
case MCI_NOTIFY_SUCCESSFUL:
// 如果播放或录音正在进行中，则发送停止消息
if (bPlaying)
SendMessage (hwnd, WM_COMMAND, IDC_PLAY_END, 0) ;
if (bRecording)
SendMessage (hwnd, WM_COMMAND, IDC_RECORD_END, 0);
return TRUE ;
}
break ;
case WM_SYSCOMMAND:
switch (wParam)
{
case SC_CLOSE:
if (bRecording)
SendMessage (hwnd, WM_COMMAND, IDC_RECORD_END, 0L) ;
if (bPlaying)
SendMessage (hwnd, WM_COMMAND, IDC_PLAY_END, 0L) ;
EndDialog (hwnd, 0) ;
return TRUE ;
}
break ;
}
return FALSE ;
}
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