dialogbox()调用后程序不回调

Question

这是我从un4seen.com下载的一个示例程序，低音音频库示例。但是，当我尝试构建它时，尽管它成功生成了可执行文件并运行，但未显示 window 。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。谁能告诉我问题出在哪里？

#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;
}

Answer 1

您应该检查所有返回的值。

::INT_PTR const result(::DialogBox(hInstance, (char*)1000, 0, &dialogproc));
if(-1 == result)
{
    ::DWORD const last_error(::GetLastError());
    // check error code...
}

另外 (char*)1000 相当可疑，通常您将 header 包含在资源文件定义中并使用 MAKEINTRESOURCE(MY_DLG_ID).

Answer 2

这一行：

DialogBox(hInstance, (char*)1000, 0, &dialogproc);

可能因为资源 (1000) 丢失而失败。

第二个参数是资源 ID - 但指向未链接的资源。也就是说，您在 .res 中链接（从 .rc 文件编译）应该有一个定义为 ID 1000 的对话框模板. 对话框模板定义了对话框的布局、按钮、控件和每个控件的位置。您确定没有丢失示例 .cpp 文件附带的 .rc 文件吗？如果您有该 rc 文件，请将其添加到您的 Visual Studio 项目中。

奇怪的是，资源 ID（和对话框控件的命令 ID）很少是代码中的硬编码数字。您通常有一个定义 #define IDD_DIALOG1 1000 或类似内容的 resource.h 文件。它包含在 resource.rc 文件和 C/C++ 代码中。

Update - 我怀疑您正在尝试编译下载 bass24.zip 时附带的 basstest 项目。但是你只编译了.c文件，并没有编译相应的basstest.rc文件。

dialogbox()调用后程序不回调

The program doesn't callback after dialogbox() is called

c++

windows

bass