[英]I can't get this example from DirectWrite to run in V2015
我从 MS 的这个页面得到了下面的例子,但是由于这个消息,代码没有链接:
错误 LNK2019:函数 _wmain 中引用的未解析的外部符号 __imp__DWriteCreateFactory@12
我重复下面的代码以方便阅读:
#include <dwrite.h>
#include <string.h>
#include <stdio.h>
#include <new>
// SafeRelease inline function.
template <class T> inline void SafeRelease(T **ppT)
{
if (*ppT)
{
(*ppT)->Release();
*ppT = NULL;
}
}
void wmain()
{
IDWriteFactory* pDWriteFactory = NULL;
HRESULT hr = DWriteCreateFactory(
DWRITE_FACTORY_TYPE_SHARED,
__uuidof(IDWriteFactory),
reinterpret_cast<IUnknown**>(&pDWriteFactory)
);
IDWriteFontCollection* pFontCollection = NULL;
// Get the system font collection.
if (SUCCEEDED(hr))
{
hr = pDWriteFactory->GetSystemFontCollection(&pFontCollection);
}
UINT32 familyCount = 0;
// Get the number of font families in the collection.
if (SUCCEEDED(hr))
{
familyCount = pFontCollection->GetFontFamilyCount();
}
for (UINT32 i = 0; i < familyCount; ++i)
{
IDWriteFontFamily* pFontFamily = NULL;
// Get the font family.
if (SUCCEEDED(hr))
{
hr = pFontCollection->GetFontFamily(i, &pFontFamily);
}
IDWriteLocalizedStrings* pFamilyNames = NULL;
// Get a list of localized strings for the family name.
if (SUCCEEDED(hr))
{
hr = pFontFamily->GetFamilyNames(&pFamilyNames);
}
UINT32 index = 0;
BOOL exists = false;
wchar_t localeName[LOCALE_NAME_MAX_LENGTH];
if (SUCCEEDED(hr))
{
// Get the default locale for this user.
int defaultLocaleSuccess = GetUserDefaultLocaleName(localeName, LOCALE_NAME_MAX_LENGTH);
// If the default locale is returned, find that locale name, otherwise use "en-us".
if (defaultLocaleSuccess)
{
hr = pFamilyNames->FindLocaleName(localeName, &index, &exists);
}
if (SUCCEEDED(hr) && !exists) // if the above find did not find a match, retry with US English
{
hr = pFamilyNames->FindLocaleName(L"en-us", &index, &exists);
}
}
// If the specified locale doesn't exist, select the first on the list.
if (!exists)
index = 0;
UINT32 length = 0;
// Get the string length.
if (SUCCEEDED(hr))
{
hr = pFamilyNames->GetStringLength(index, &length);
}
// Allocate a string big enough to hold the name.
wchar_t* name = new (std::nothrow) wchar_t[length+1];
if (name == NULL)
{
hr = E_OUTOFMEMORY;
}
// Get the family name.
if (SUCCEEDED(hr))
{
hr = pFamilyNames->GetString(index, name, length+1);
}
if (SUCCEEDED(hr))
{
// Print out the family name.
wprintf(L"%s\n", name);
}
SafeRelease(&pFontFamily);
SafeRelease(&pFamilyNames);
delete [] name;
}
SafeRelease(&pFontCollection);
SafeRelease(&pDWriteFactory);
}
由于这些是我在 DirectWrite 中的第一步,我对上面提到的错误消息一无所知。
DWriteCreateFactory 上的 MSDN 页面声明您必须包含dwrite.h
(假设您在代码编译后已经完成)并链接dwrite.lib
。
您必须将该库显式添加到您的 VisualStudio 项目中。
我知道这是一个旧论坛,但我想补充一点,您也可以使用 #pragma comment(lib, "dwrite.lib") 链接库
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