设置静态文本颜色 Win32 [英] Set static text color Win32

问题描述

我正在制作一个控制对话框的dll.我喜欢让某个区域有红色文字.这段代码确实可以编译，但是没有看到效果.这里是 dialogProc 完成的区域:

LRESULT CALLBACK DialogProc(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam){开关(消息){案例 WM_INITDIALOG:CheckDlgButton(hDlg, IDC_CHECK, FALSE);EnableWindow(GetDlgItem(hDlg, IDOK), FALSE);返回真；案例 WM_COMMAND:开关 (LOWORD(wParam)){案例IDC_CHECK:如果(IsDlgButtonChecked(hDlg，IDC_CHECK)){EnableWindow(GetDlgItem(hDlg, IDOK), TRUE);EnableWindow(GetDlgItem(hDlg, IDCANCEL), FALSE);}别的{EnableWindow(GetDlgItem(hDlg, IDOK), FALSE);EnableWindow(GetDlgItem(hDlg, IDCANCEL), TRUE);}休息;案例IDOK:{EndDialog(hDlg, TRUE);返回假；}案例IDCANCEL:{EndDialog(hDlg, FALSE);返回假；}案例 WM_CTLCOLORSTATIC://为我们的 URL 设置文本的颜色if ((HWND)lParam == GetDlgItem(hDlg,IDC_WARNING)){//我们将要绘制静态//在 (HDC)lParam 中设置文本颜色SetBkMode((HDC)wParam,TRANSPARENT);SetTextColor((HDC)wParam, RGB(255,0,0));返回(BOOL)CreateSolidBrush(GetSysColor(COLOR_MENU))；}返回真；}}返回假；}

解决方案

WM_CTLCOLORSTATIC 是一条独立于 WM_COMMAND 的消息.您希望对消息的处理似乎是正确的，只是对消息的检查在您对 WM_COMMAND 特定项目的检查中.尝试重新组织外部 switch 语句.也许类似于以下内容:

LRESULT CALLBACK DialogProc(HWND hDlg, UINT message,WPARAM wParam, LPARAM lParam){开关(消息){案例 WM_INITDIALOG://...休息;案例 WM_COMMAND:开关 (LOWORD(wParam)){案例IDC_CHECK://...休息;案例IDOK://...休息;案例IDCANCEL://...休息;}休息;案例 WM_CTLCOLORSTATIC://为我们的 URL 设置文本的颜色如果((HWND)lParam == GetDlgItem(hDlg，IDC_WARNING)){//我们将要绘制静态//在 (HDC)lParam 中设置文本颜色SetBkMode((HDC)wParam,TRANSPARENT);SetTextColor((HDC)wParam, RGB(255,0,0));//注意:根据 selbie 所指出的文档，GetSolidBrush 会泄漏 GDI 句柄.返回 (BOOL)GetSysColorBrush(COLOR_MENU);}休息;}返回假；}

另请注意，当 wParam 应该为 WM_CTLCOLORSTATIC 提供 HDC 时，过滤 WM_COMMAND 的 wParam 参数会有点奇怪.

MSDN 上的 WM_CTLCOLORSTATIC 通知

I am making a dll that controls a dialogue box. I like to get a certain area to have red text. This code does compile, but the effect is not seen. Here is the area where the dialogProc is done:

LRESULT CALLBACK DialogProc(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch(message)
    {
    case WM_INITDIALOG:     
        CheckDlgButton(hDlg, IDC_CHECK, FALSE);
        EnableWindow(GetDlgItem(hDlg, IDOK), FALSE);
        return TRUE;

    case WM_COMMAND:
        switch (LOWORD(wParam))
        {
        case IDC_CHECK:
            if (IsDlgButtonChecked(hDlg, IDC_CHECK))
            {
                EnableWindow(GetDlgItem(hDlg, IDOK), TRUE);
                EnableWindow(GetDlgItem(hDlg, IDCANCEL), FALSE);
            }
            else
            {
                EnableWindow(GetDlgItem(hDlg, IDOK), FALSE);
                EnableWindow(GetDlgItem(hDlg, IDCANCEL), TRUE);
            }
            break;
        case IDOK:
            {           
                EndDialog(hDlg, TRUE);
                return FALSE;
            }
        case IDCANCEL:
            {               
                EndDialog(hDlg, FALSE);
                return FALSE;
            }
        case WM_CTLCOLORSTATIC:
            // Set the colour of the text for our URL
            if ((HWND)lParam == GetDlgItem(hDlg,IDC_WARNING)) 
            {
                // we're about to draw the static
                // set the text colour in (HDC)lParam
                SetBkMode((HDC)wParam,TRANSPARENT);
                SetTextColor((HDC)wParam, RGB(255,0,0));
                return (BOOL)CreateSolidBrush (GetSysColor(COLOR_MENU));
            }
    return TRUE;
        }
    }
    return FALSE;
}

解决方案

WM_CTLCOLORSTATIC is a separate message from WM_COMMAND. Your desired handling of the message appears to be correct except that the check for the message is inside your check for WM_COMMAND specific items. Try reorganizing your outer switch statement. Perhaps something like the following:

LRESULT CALLBACK DialogProc(HWND hDlg, UINT message, 
                            WPARAM wParam, LPARAM lParam)
{
    switch(message)
    {
    case WM_INITDIALOG:         
        // ...
        break;
    case WM_COMMAND:
        switch (LOWORD(wParam))
        {
        case IDC_CHECK:
            // ...
            break;
        case IDOK:
            // ...
            break;
        case IDCANCEL:
            // ...
            break;
        }
        break;
    case WM_CTLCOLORSTATIC:
        // Set the colour of the text for our URL
        if ((HWND)lParam == GetDlgItem(hDlg, IDC_WARNING)) 
        {
                // we're about to draw the static
                // set the text colour in (HDC)lParam
                SetBkMode((HDC)wParam,TRANSPARENT);
                SetTextColor((HDC)wParam, RGB(255,0,0));
                // NOTE: per documentation as pointed out by selbie, GetSolidBrush would leak a GDI handle.
                return (BOOL)GetSysColorBrush(COLOR_MENU);
        }
        break;
    }
    return FALSE;
}

Also note that it would be kinda weird to filter WM_COMMAND's wParam argument when wParam is supposed to provide the HDC for WM_CTLCOLORSTATIC.

WM_CTLCOLORSTATIC Notification at MSDN

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