Tools

 1. DebugView，输出调试信息（不能F5，而是要Ctrl + F5，F5输出到VC的debug窗口）

void DbgPrint(char* pFMT, ...)
{
    char szBuf[1024] = {0};
    va_list lst;
    va_start(lst, pFMT);
    vsprintf(szBuf, pFMT, lst);
    va_end(lst);
    
    OutputDebugString(szBuf);
}

 2. C语言，拼接字符串

//使用后要free
char* split(char* a, char* b) 
{  
    char* c = (char*)malloc(strlen(a) + strlen(b) + 1);
    if (c == NULL) 
    {
        return NULL;
    }
    
    char* tempc = c;
    while (*a != '') 
    {  
        *tempc++ = *a++;  
    }  
    while ((*tempc++ = *b++) != '');
    
    return c;
}

 3. 响应 WM_DROPFILES 消息（#define WM_DROPFILES 0x0233）

1）MFC版

void CTestDlg::OnDropFiles(HDROP hDropInfo) 
{
    char szPath[MAX_PATH] = {0};
    
    DragQueryFile(hDropInfo, NULL, szPath, sizeof(szPath) / sizeof(*szPath));
    DragFinish(hDropInfo);
    
    SetDlgItemText(IDC_EDT_PATH, szPath);

    CDialog::OnDropFiles(hDropInfo);
}

 2）SDK版

case WM_DROPFILES:
{
    char szPath[MAX_PATH] = {0};

    DragQueryFileA((HDROP)wParam, NULL, szPath, sizeof(szPath) / sizeof(*szPath));
    DragFinish((HDROP)wParam);

    HWND hEdit = GetDlgItem(hwnd, IDC_EDT_PATH);
    SetWindowTextA(hEdit, szPath);
    
    break;
}