小编Oğu*_*zer的帖子

我有运行Win CE的ICOP VDX-6354板.我正试图从我的C#程序中控制电路板的蜂鸣器.我尝试了所有的playound等"coredll.dll"平台调用.到目前为止他们都没有工作.所以我最后一次机会是创建自己的DLL.

unsigned char inp(short addr)
{
    unsigned char cValue;
    _asm
    {
        mov dx, addr
        in ax, dx
        mov cValue, al
    }
    return cValue;
}
void outp(int addr, unsigned char val)
{
     __asm
    {
        push edx
        mov edx, DWORD PTR addr
        mov al, BYTE PTR val
        out dx, al
        pop edx
    }
}
bool MyBeep(DWORD dwFreq, DWORD dwDuration)
{
    outp(0x43, 0xb6); // Set Buzzer
    outp(0x42, (0x1234dc / dwFreq)); // Frequency LSB
    outp(0x42, (0x1234dc / dwFreq) >> 8); // Frequency …