作为更大项目的一部分,我试图通过将现有图标绘制为HBITMAP,然后将其转换回HICON,从现有HICON创建HICON。 (这将允许我修改图标,例如,通过在其上绘制文本。)
不幸的是,该图标显示为黑色正方形。这是我的代码:
bool createIcon()
{
bool ret = false;
// get context of window
HDC context = GetDC(window_);
if (context != NULL)
{
// create a buffer context
HDC buffer = CreateCompatibleDC(context);
if (buffer != NULL)
{
PatBlt(buffer, 0, 0, iconSize_, iconSize_, WHITENESS);
// create a bitmap for our use
HBITMAP bitmap = CreateCompatibleBitmap(context, iconSize_, iconSize_);
if (bitmap != NULL)
{
HBITMAP oldBitmap;
// select the bitmap with the buffer
oldBitmap = reinterpret_cast<HBITMAP>(SelectObject(buffer, bitmap));
if (oldBitmap != NULL)
{
// draw the icon
if (DrawIcon(buffer, 0, 0, icon_))
{
if (icon_ != NULL)
DestroyIcon(icon_);
ImageList_RemoveAll(imageList_);
if (ImageList_Add(imageList_, bitmap, NULL) != -1)
{
icon_ = ImageList_GetIcon(imageList_, 0, ILD_NORMAL);
if (icon_ != NULL)
ret = true;
}
}
SelectObject(buffer, oldBitmap);
}
DeleteObject(bitmap);
}
DeleteDC(buffer);
}
DeleteDC(context);
}
return ret;
}
有任何想法吗?
最佳答案
也许您想检查位图本身是否为黑色,或者它是否良好并且仅图标为黑色。根据我的经验(尽管我对此没有合理的解释),问题出在CreateCompatibleBitmap
周围,我希望位图本身已经是黑色的。请尝试CreateDIBSection
。这曾经为我工作:
//HBITMAP hBitmap = CreateCompatibleBitmap(hDc, ResourceIconColorBitmap.bmWidth, ResourceIconColorBitmap.bmHeight);
BITMAPINFO BitmapInformation;
ZeroMemory(&BitmapInformation, sizeof BitmapInformation);
BitmapInformation.bmiHeader.biSize = sizeof BitmapInformation.bmiHeader;
BitmapInformation.bmiHeader.biWidth = ResourceIconColorBitmap.bmWidth;
BitmapInformation.bmiHeader.biHeight = ResourceIconColorBitmap.bmHeight;
BitmapInformation.bmiHeader.biPlanes = 1;
BitmapInformation.bmiHeader.biBitCount = 24;
VOID* pvBits;
HBITMAP hBitmap = CreateDIBSection(hDc, &BitmapInformation, DIB_RGB_COLORS, &pvBits, NULL, 0);
关于c++ - 通过将现有的HICON绘画到HBITMAP来创建HICON,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/12399357/