Window下编译qtpdfium _Window

不操千曲而后晓声，观千剑而后识器。这篇文章主要讲述Window下编译qtpdfium相关的知识，希望能为你提供帮助。
【Window下编译qtpdfium】

系统环境：windows11
Qt版本：Qt5.15.2
源代码路径：??https://codeload.github.com/kkzi/qpdf/zip/2681018e300738d6da9a9f89f06c93fc3ef17831??
下载下来后，直接用MSVC2019编译器的CMake环境编译，顺利通过。但是使用Mingw编译器编译的时候，却出现了一堆错误。错误就不截图了，现在已经把坑全部填平，懒得再返回去了。接下来直接贴出要修改的地方
1.修改qpdf\\CMakeLists.txt

#在代码
set(CMAKE_DEBUG_POSTFIX d)
#后面，添加下面代码

if(CMAKE_COMPILER_IS_GNUCXX)
set(CMAKE_CXX_FLAGS "-std=c++11 $CMAKE_CXX_FLAGS") #设置编译C++文件时，使用c++11
message(STATUS "optional:-std=c++11")
endif(CMAKE_COMPILER_IS_GNUCXX)

IF (WIN32)
MESSAGE(STATUS "Now is windows")
add_compile_options(-shared -fPIC)
ELSEIF (APPLE)
MESSAGE(STATUS "Now is Apple systens.")
ELSEIF (UNIX)
MESSAGE(STATUS "Now is UNIX-like OSs. Including aPPLE os xand CygWin")
add_compile_options(-std=c++11 -shared -fPIC) #linux下必须要添加编译选项-fPIC，要不然提示错误
ENDIF ()

2.修改qpdf\\src\\3rdparty\\CMakeLists.txt

#注释掉下面代码
#if(MSVC)
#list(APPEND PDFIUM_SOURCES
#pdfium/core/fxge/win32/fx_win32_device.cpp
#pdfium/core/fxge/win32/fx_win32_dib.cpp
#pdfium/core/fxge/win32/fx_win32_dwrite.cpp
#pdfium/core/fxge/win32/fx_win32_gdipext.cpp
#pdfium/core/fxge/win32/fx_win32_print.cpp
#)

#list(APPEND PDFIUM_HEADERS
#pdfium/core/fxge/win32/dwrite_int.h
#pdfium/core/fxge/win32/win32_int.h
#)
#endif(MSVC)

#添加下列代码
IF (WIN32)
add_definitions(-DCOMPILE_SAL_MINGW) #增加预编译宏，等下在代码修改里要用到
MESSAGE(STATUS "Now is windows")
list(APPEND PDFIUM_SOURCES
pdfium/core/fxge/win32/fx_win32_device.cpp
pdfium/core/fxge/win32/fx_win32_dib.cpp
pdfium/core/fxge/win32/fx_win32_dwrite.cpp
pdfium/core/fxge/win32/fx_win32_gdipext.cpp
pdfium/core/fxge/win32/fx_win32_print.cpp
)

list(APPEND PDFIUM_HEADERS
pdfium/core/fxge/win32/dwrite_int.h
pdfium/core/fxge/win32/win32_int.h
)

ELSEIF (APPLE)
MESSAGE(STATUS "Now is Apple systens.")
ELSEIF (UNIX)
MESSAGE(STATUS "Now is UNIX-like OSs. Including aPPLE os xand CygWin")
ENDIF ()

3.修改代码：qpdf\\src\\3rdparty\\pdfium\\core\\fxge\\win32\\fx_win32_dwrite.cpp

#
# 修改函数：HRESULT(__stdcall* FuncType_DWriteCreateFactory)为下面
# 大概位置14行
#

#ifdef COMPILE_SAL_MINGW
typedef HRESULT(__stdcall* FuncType_DWriteCreateFactory)(
_In_ DWRITE_FACTORY_TYPE,
_In_ REFIID,
_Out_ IUnknown**);
# else
typedef HRESULT(__stdcall* FuncType_DWriteCreateFactory)(
__in DWRITE_FACTORY_TYPE,
__in REFIID,
__out IUnknown**);
#endif

#
# 修改函数：HRESULT STDMETHODCALLTYPE DrawGlyphRun(const FX_RECT& text_bbox为下面
# 大概位置120行
#

#ifdef COMPILE_SAL_MINGW
HRESULT STDMETHODCALLTYPE DrawGlyphRun(const FX_RECT& text_bbox,
__in_opt CFX_ClipRgn* pClipRgn,
__in_opt DWRITE_MATRIX const* pMatrix,
FLOAT baselineOriginX,
FLOAT baselineOriginY,
DWRITE_MEASURING_MODE measuringMode,
_In_ DWRITE_GLYPH_RUN const* glyphRun,
const COLORREF& textColor);
# else
HRESULT STDMETHODCALLTYPE DrawGlyphRun(const FX_RECT& text_bbox,
__in_opt CFX_ClipRgn* pClipRgn,
__in_opt DWRITE_MATRIX const* pMatrix,
FLOAT baselineOriginX,
FLOAT baselineOriginY,
DWRITE_MEASURING_MODE measuringMode,
__in DWRITE_GLYPH_RUN const* glyphRun,
const COLORREF& textColor);
#endif

#
# 修改函数：STDMETHODIMP CDwGdiTextRenderer::DrawGlyphRun(为下面
# 大概位置431行
#

#ifdef COMPILE_SAL_MINGW

STDMETHODIMP CDwGdiTextRenderer::DrawGlyphRun(
const FX_RECT& text_bbox,
__in_opt CFX_ClipRgn* pClipRgn,
__in_opt DWRITE_MATRIX const* pMatrix,
FLOAT baselineOriginX,
FLOAT baselineOriginY,
DWRITE_MEASURING_MODE measuringMode,
_In_ DWRITE_GLYPH_RUN const* glyphRun,
const COLORREF& textColor)
# else
STDMETHODIMP CDwGdiTextRenderer::DrawGlyphRun(
const FX_RECT& text_bbox,
__in_opt CFX_ClipRgn* pClipRgn,
__in_opt DWRITE_MATRIX const* pMatrix,
FLOAT baselineOriginX,
FLOAT baselineOriginY,
DWRITE_MEASURING_MODE measuringMode,
__in DWRITE_GLYPH_RUN const* glyphRun,
const COLORREF& textColor)
#endif

4.修改代码qpdf_cmake\\src\\3rdparty\\pdfium\\core\\fxge\\win32\\fx_win32_gdipext.cpp

# 694行

m_Functions[i] = GetProcAddress(m_hModule, g_GdipFuncNames[i]);

# 修改成

m_Functions[i] = (void*)GetProcAddress(m_hModule, g_GdipFuncNames[i]);

# 709行

GetProcAddress(m_GdiModule, "AddFontMemResourceEx");

# 修改成

(void*)GetProcAddress(m_GdiModule, "AddFontMemResourceEx");

# 711行

GetProcAddress(m_GdiModule, "RemoveFontMemResourceEx");

# 修改成

(void*)GetProcAddress(m_GdiModule, "RemoveFontMemResourceEx");