Generates Qt-based C++ services using a protobuf schema
Note: This command is in technology preview and may change in future releases.
This command was introduced in Qt 6.5.
qtgrpcgen is invoked through the
qt_add_grpc CMake macro.
qt_add_grpc(<target> <TARGET_TYPE> PROTO_FILES <file> ... [COPY_COMMENTS] [GENERATE_PACKAGE_SUBFOLDERS] [EXTRA_NAMESPACE <namespace>] [EXPORT_MACRO <infix>] [PROTO_INCLUDES <path> ...] [OUTPUT_DIRECTORY <dir>] [OUTPUT_HEADERS <var>] [OUTPUT_TARGETS <var>] )
The source files are created by
qtgrpcgen and added to the target. If the target already exists, the files are added to the target source list. If the target doesn't exist, it is created as a library which you must link to.
The gRPC library that is generated using the
qt_add_grpc command refers to the protobuf symbols that are used in service calls. This means you either need to use a common target in both qt_add_protobuf and qt_add_grpc calls or link the generated protobuf library to the gRPC one.
Considering the above statement you may reuse the target for both protobuf and gRPC client code:
# Generate the protobuf types first qt_add_protobuf(test_service_client PROTO_FILES test_service.protobuf ) ... # Reuse the protobuf target and extend it with gRPC client # functionality qt_add_grpc(test_service_client CLIENT PROTO_FILES test_service.protobuf )
If you want to have separate targets then you need to link the gRPC client target to the protobuf one:
# Generate the protobuf types first qt_add_protobuf(test_service_protobuf PROTO_FILES test_service.protobuf ) ... # Add separate target with the generated code of the gRPC client. qt_add_grpc(test_service_client CLIENT PROTO_FILES test_service.protobuf ) target_link_libraries(test_service_client PRIVATE test_service_protobuf)
TARGET_TYPEis the type of gRPC code to be generated. Since gRPC supports a client-server architecture,
SERVERsource code may be generated.
Note: for Qt 6.5 only
CLIENTsource code generation is supported.
COPY_COMMENTScopies comments from
.protofiles. If provided in the parameter list, comments related to messages and fields are copied to generated header files.
GENERATE_PACKAGE_SUBFOLDERSgenerates a folder structure for the generated files matching the
.protofile's package name. For example,
package io.qt.test;would put the generated files into
EXTRA_NAMESPACEis an optional namespace that will be used for the generated classes. The classes are always generated in a namespace whose name is the same as the package name specified in the
.protofile. If this option is used, then everything will be nested inside the extra namespace.
EXPORT_MACROis the base name of the symbol export macro used for the generated code. The generated macro name is constructed as
QPB_<EXPORT_MACRO>_EXPORT. If the option is not set, the macro is not generated.
PROTO_FILESis the list of
.protofiles that will be used in the generation procedure.
PROTO_INCLUDESis the list of directories that will be searched for dependencies.
OUTPUT_DIRECTORYis the directory where the generated files will be put. By default, the current directory (while evaluating the function) is used.
OUTPUT_HEADERScan be used to specify a variable that will hold the list of headers created by the function. This list can be useful for custom project install rules.
OUTPUT_TARGETScan be used to specify a variable that will hold the list of targets created by the function. This list can be useful for custom project install rules.
See also The qtgrpcgen Tool.
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