这是我从un4seen.com下载的示例程序，贝司音频库样本。但是，当我尝试构建它时，虽然它成功生成了可执行文件并运行，但没有显示任何窗口。我试图添加几个断点，并认为程序在调用Dialogbox（）之后立即结束并且没有进行回调。谁能告诉我这是什么问题？
#include <windows.h>
#include <iostream>
#include <commctrl.h>
#include <stdio.h>
#include <math.h>
#include "bass.h"
#pragma comment( lib, "comctl32.lib " )
HWND win = NULL;
#define MESS(id,m,w,l) SendDlgItemMessage(win,id,m,(WPARAM)(w),(LPARAM)(l))
HRECORD rchan; // recording channel
HSTREAM chan; // playback stream
HFX fx[4] = { 0 }; // FX handles
int chunk; // recording chunk size
int input; // current input source
int latency = 0; // current latency
#define SAMPLERATE 44100
#define ADJUSTRATE // adjust the output rate (in case input and output devices are going at slightly different speeds)
DWORD rate; // current output rate
DWORD prebuf; // prebuffering amount
#ifdef ADJUSTRATE
DWORD targbuf; // target buffer level
DWORD prevbuf; // previous buffer level/threshold
#endif
void Error(const char *es)
{
char mes[200];
sprintf(mes, "%s\n(error code: %d)", es, BASS_ErrorGetCode());
MessageBox(win, mes, 0, 0);
}
BOOL CALLBACK RecordingCallback(HRECORD handle, const void *buffer, DWORD length, void *user)
{
DWORD bl;
BASS_StreamPutData(chan, buffer, length); // feed recorded data to output stream
bl = BASS_ChannelGetData(chan, NULL, BASS_DATA_AVAILABLE); // get output buffer level
if (prebuf) { // prebuffering
if (bl >= prebuf + length) { // gone 1 block past the prebuffering target
#ifdef ADJUSTRATE
targbuf = bl; // target the current level
prevbuf = 0;
#endif
prebuf = 0; // finished prebuffering
BASS_ChannelPlay(chan, FALSE); // start the output
}
}
else { // playing
#ifdef ADJUSTRATE
if (bl<targbuf) { // buffer level is below target, slow down...
rate--;
BASS_ChannelSetAttribute(chan, BASS_ATTRIB_FREQ, rate);
prevbuf = 0;
}
else if (bl>targbuf && bl >= prevbuf) { // buffer level is high and not falling, speed up...
rate++;
BASS_ChannelSetAttribute(chan, BASS_ATTRIB_FREQ, rate);
prevbuf = bl;
}
#endif
}
return TRUE; // continue recording
}
BOOL Initialize()
{
BASS_INFO bi;
BASS_SetConfig(BASS_CONFIG_VISTA_TRUEPOS, 0); // allows lower latency on Vista and newer
// initialize default output device (and measure latency)
if (!BASS_Init(-1, SAMPLERATE, BASS_DEVICE_LATENCY, win, NULL)) {
Error("Can't initialize output");
return FALSE;
}
BASS_GetInfo(&bi);
if (bi.dsver<8) { // no DX8, so disable effect buttons
EnableWindow(GetDlgItem(win, 20), FALSE);
EnableWindow(GetDlgItem(win, 21), FALSE);
EnableWindow(GetDlgItem(win, 22), FALSE);
EnableWindow(GetDlgItem(win, 23), FALSE);
}
// create a stream to play the recording
chan = BASS_StreamCreate(SAMPLERATE, 2, 0, STREAMPROC_PUSH, 0);
rate = SAMPLERATE;
prebuf = BASS_ChannelSeconds2Bytes(chan, bi.minbuf / 1000.f); // prebuffer at least "minbuf" worth of data
// start recording with 10ms period
if (!BASS_RecordInit(-1) || !(rchan = BASS_RecordStart(SAMPLERATE, 2, MAKELONG(0, 10), RecordingCallback, 0))) {
BASS_RecordFree();
BASS_Free();
Error("Can't initialize recording");
return FALSE;
}
{ // get list of inputs
int c;
const char *i;
for (c = 0; i = BASS_RecordGetInputName(c); c++) {
float level;
MESS(10, CB_ADDSTRING, 0, i);
if (!(BASS_RecordGetInput(c, &level)&BASS_INPUT_OFF)) { // this 1 is currently "on"
input = c;
MESS(10, CB_SETCURSEL, input, 0);
MESS(11, TBM_SETPOS, TRUE, level * 100); // set level slider
}
}
}
return TRUE;
}
INT_PTR CALLBACK dialogproc(HWND h, UINT m, WPARAM w, LPARAM l)
{
switch (m) {
case WM_TIMER:
{ // display current latency (input+output buffer level)
char buf[20];
latency = (latency * 3 + BASS_ChannelGetData(chan, NULL, BASS_DATA_AVAILABLE)
+ BASS_ChannelGetData(rchan, NULL, BASS_DATA_AVAILABLE)) / 4;
sprintf(buf, "%d", (int)(BASS_ChannelBytes2Seconds(chan, latency) * 1000));
MESS(15, WM_SETTEXT, 0, buf);
}
break;
case WM_COMMAND:
switch (LOWORD(w)) {
case IDCANCEL:
DestroyWindow(h);
break;
case 10:
if (HIWORD(w) == CBN_SELCHANGE) { // input selection changed
int i;
float level;
input = MESS(10, CB_GETCURSEL, 0, 0); // get the selection
for (i = 0; BASS_RecordSetInput(i, BASS_INPUT_OFF, -1); i++); // 1st disable all inputs, then...
BASS_RecordSetInput(input, BASS_INPUT_ON, -1); // enable the selected input
BASS_RecordGetInput(input, &level); // get the level
MESS(11, TBM_SETPOS, TRUE, level * 100);
}
break;
case 20: // toggle chorus
if (fx[0]) {
BASS_ChannelRemoveFX(chan, fx[0]);
fx[0] = 0;
}
else
fx[0] = BASS_ChannelSetFX(chan, BASS_FX_DX8_CHORUS, 0);
break;
case 21: // toggle gargle
if (fx[1]) {
BASS_ChannelRemoveFX(chan, fx[1]);
fx[1] = 0;
}
else
fx[1] = BASS_ChannelSetFX(chan, BASS_FX_DX8_GARGLE, 0);
break;
case 22: // toggle reverb
if (fx[2]) {
BASS_ChannelRemoveFX(chan, fx[2]);
fx[2] = 0;
}
else
fx[2] = BASS_ChannelSetFX(chan, BASS_FX_DX8_REVERB, 0);
break;
case 23: // toggle flanger
if (fx[3]) {
BASS_ChannelRemoveFX(chan, fx[3]);
fx[3] = 0;
}
else
fx[3] = BASS_ChannelSetFX(chan, BASS_FX_DX8_FLANGER, 0);
break;
}
break;
case WM_HSCROLL:
if (l) { // set input source level
float level = SendMessage((HWND)l, TBM_GETPOS, 0, 0) / 100.f;
if (!BASS_RecordSetInput(input, 0, level)) // failed to set input level
BASS_RecordSetInput(-1, 0, level); // try master level instead
}
break;
case WM_INITDIALOG:
win = h;
MESS(11, TBM_SETRANGE, FALSE, MAKELONG(0, 100)); // initialize input level slider
MessageBox(win,
"Do not set the input to 'WAVE' / 'What you hear' (etc...) with\n"
"the level set high, as that is likely to result in nasty feedback.\n",
"Feedback warning", MB_ICONWARNING);
if (!Initialize()) {
DestroyWindow(win);
break;
}
SetTimer(h, 1, 250, NULL);
return 1;
case WM_DESTROY:
KillTimer(h, 1);
// release it all
BASS_RecordFree();
BASS_Free();
break;
}
return 0;
}
int PASCAL WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
// check the correct BASS was loaded
if (HIWORD(BASS_GetVersion()) != BASSVERSION) {
MessageBox(0, "An incorrect version of BASS.DLL was loaded", 0, MB_ICONERROR);
return 0;
}
{ // enable trackbar support (for the level control)
INITCOMMONCONTROLSEX cc = { sizeof(cc),ICC_BAR_CLASSES };
InitCommonControlsEx(&cc);
}
DialogBox(hInstance, (char*)1000, 0, &dialogproc);
return 0;
}
答案 0 :(得分：0)
您应该检查返回的所有值。
::INT_PTR const result(::DialogBox(hInstance, (char*)1000, 0, &dialogproc));
if(-1 == result)
{
::DWORD const last_error(::GetLastError());
// check error code...
}
同样(char*)1000相当可疑，通常包含资源文件定义的标头并使用MAKEINTRESOURCE(MY_DLG_ID)。
答案 1 :(得分：0)
这一行：
DialogBox(hInstance, (char*)1000, 0, &dialogproc);
可能会失败，因为缺少资源（1000）。
第二个参数是资源ID - 但是没有链接到的资源。也就是说，你链接的.res（从.rc文件编译）应该有一个ID为1000的对话框模板对话框模板定义了对话框的布局，按钮，控件和每个的位置。您确定自己没有错过该样本.rc文件附带的.cpp文件吗？如果您有该rc文件，请将其添加到Visual Studio项目中。
奇怪的是，资源ID（以及对话框控件的命令ID）很少是代码中的硬编码数字。您通常有一个resource.h文件，用于定义#define IDD_DIALOG1 1000或类似内容。它包含在resource.rc文件和C / C ++代码中。
更新 - 我怀疑您正在尝试编译下载bass24.zip附带的basstest项目。但是你只编译了.c文件，而不是相应的basstest.rc文件。