我正在尝试在控制台应用程序中使用“多线程”，在该应用程序中我正在使用SetPixel()在缓冲区中呈现图像，而最近我无法再编译我的应用程序，
Boot.cpp:
#include <stdio.h>
#include <thread>
#include "Tes32/GraphicsDevice/GraphicsController.h"
#include "Tes32/AudioDevice/AudioController.h"
void ShowConsoleCursor(bool showFlag)
{
HANDLE out = GetStdHandle(STD_OUTPUT_HANDLE);
CONSOLE_CURSOR_INFO cursorInfo;
GetConsoleCursorInfo(out, &cursorInfo);
cursorInfo.bVisible = showFlag; // set the cursor visibility
SetConsoleCursorInfo(out, &cursorInfo);
}
int main(int argc, char** argv) {
printf("\n\nInitializing AudioDevice...");
Tes32::AudioDevice::AudioController a_ctx;
printf("Initializing GraphicsDevice...");
Tes32::GraphicsDevice::GraphicsController g_ctx();
printf("\n\tCreating Thread %%gctx.RenderLoop");
system("sleep 1");
system("clear");
ShowConsoleCursor(false);
std::thread g_ctx_renderloop(&Tes32::GraphicsDevice::GraphicsController::RenderThread, g_ctx);
g_ctx_renderloop.join();
}
GraphicsController.cpp:
#include "GraphicsController.h"
Tes32::GraphicsDevice::GraphicsController::GraphicsController()
{
this->display_ctx = GetConsoleWindow();
this->render_ctx = GetDC(display_ctx);
this->display_handle = GetStdHandle(STD_OUTPUT_HANDLE);
std::vector<std::string> driversettings;
int width, height;
Tes32::GraphicsDevice::InternalTypes::ColorPixel fillclr;
std::ifstream file(std::experimental::filesystem::current_path().string() + "\\Debug\\HDD\\System\\Drivers\\tesvga.inf");
if (file.is_open()) {
printf("LOADED!");
std::string line;
while (getline(file, line)) {
driversettings.push_back(line);
}
file.close();
}
for (std::string s : driversettings) {
std::vector<std::string> Split = this->split(s, "=");
if (Split[0] == "GraphicsMode") {
if (Split[1] == "640x480") {
this->graphicsmode = 0;
width = 640;
height = 480;
Tes32::GraphicsDevice::OutputWindow::SetOutputWindowSize(this->display_handle, { 0,0 }, { 64, 64 });
}
}
else if (Split[0] == "FillColor") {
std::vector<std::string> color = this->split(Split[1], ",");
int r, g, b;
r = atoi(color[0].c_str());
g = atoi(color[1].c_str());
b = atoi(color[2].c_str());
r--; g--; b--;
this->fillcolor = { (char)r, (char)g, (char)b };
fillclr = { (char)r, (char)g, (char)b };
}
else if (Split[0] == "ColorAdjust_R") { this->clr_adjust_r = atoi(Split[1].c_str()); }
else if (Split[0] == "ColorAdjust_G") { this->clr_adjust_g = atoi(Split[1].c_str()); }
else if (Split[0] == "ColorAdjust_B") { this->clr_adjust_b = atoi(Split[1].c_str()); }
}
this->display_buffer = new Tes32::GraphicsDevice::InternalTypes::ColorPixel[width * height];
for (int y = 0; y != height; y++) {
for (int x = 0; x != width; x++) {
this->display_buffer[x + width * y] = fillclr;
}
}
this->ctx_size = { width, height };
}
bool Tes32::GraphicsDevice::GraphicsController::Destroy()
{
try {
this->KeepRendering = false;
delete this->display_buffer;
ReleaseDC(this->display_ctx, this->render_ctx);
}
catch (std::exception& e){
printf("!!!KERNEL PANIC!!! g_ctx:: Failed to Destroy GraphicsController // Details: %s\n", e.what());
return false;
}
return true;
}
void Tes32::GraphicsDevice::GraphicsController::ModifySyncRegisters(bool sRender, bool sStayWhileNotRendering)
{
this->KeepRendering = sRender;
this->Hold = sStayWhileNotRendering;
}
std::vector<std::string> Tes32::GraphicsDevice::GraphicsController::split(const std::string& str, const std::string& delim)
{
std::vector<std::string> tokens;
size_t prev = 0, pos = 0;
do
{
pos = str.find(delim, prev);
if (pos == std::string::npos) pos = str.length();
std::string token = str.substr(prev, pos - prev);
if (!token.empty()) tokens.push_back(token);
prev = pos + delim.length();
} while (pos < str.length() && prev < str.length());
return tokens;
}
void Tes32::GraphicsDevice::GraphicsController::RenderThread()
{
int start, movement, end;
start = 0;
movement = 1;
end = 480;
while (this->Hold) {
if (this->KeepRendering) {
for (int y = start; y != end; y++) {
for (int x = 0; x != this->ctx_size.x; x++) {
SetPixel(
render_ctx,
x, y,
RGB(
display_buffer[x + this->ctx_size.x * y].r,
display_buffer[x + this->ctx_size.x * y].g,
display_buffer[x + this->ctx_size.x * y].b
)
);
}
}
}
}
}
我遇到的2个错误是:
C2893:
Severity Code Description Project File Line Suppression State
Error C2893 Failed to specialize function template 'unknown-type std::invoke(_Callable &&,_Types &&...) noexcept(<expr>)' WolfOS_2_HDD V:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.20.27508\include\thread 35
C2672:
Severity Code Description Project File Line Suppression State
Error C2672 'std::invoke': no matching overloaded function found WolfOS_2_HDD V:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.20.27508\include\thread 39
编译日志:
1>------ Build started: Project: WolfOS_2_HDD, Configuration: Debug Win32 ------
1>Boot.cpp
1>V:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.20.27508\include\thread(39): error C2672: 'std::invoke': no matching overloaded function found
1>V:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.20.27508\include\thread(46): note: see reference to function template instantiation 'unsigned int std::thread::_Invoke<_Tuple,0,1>(void *) noexcept' being compiled
1> with
1> [
1> _Tuple=_Tuple
1> ]
1>V:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.20.27508\include\thread(52): note: see reference to function template instantiation 'unsigned int (__stdcall *std::thread::_Get_invoke<_Tuple,0,1>(std::integer_sequence<unsigned int,0,1>) noexcept)(void *)' being compiled
1>G:\WolfOS_2_HDD\Boot.cpp(36): note: see reference to function template instantiation 'std::thread::thread<void(__thiscall Tes32::GraphicsDevice::GraphicsController::* )(void),Tes32::GraphicsDevice::GraphicsController(__cdecl &)(void),void>(_Fn &&,Tes32::GraphicsDevice::GraphicsController (__cdecl &)(void))' being compiled
1> with
1> [
1> _Fn=void (__thiscall Tes32::GraphicsDevice::GraphicsController::* )(void)
1> ]
1>V:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.20.27508\include\chrono(595): note: see reference to class template instantiation 'std::chrono::duration<double,std::ratio<1,1>>' being compiled
1>V:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.20.27508\include\chrono(172): note: see reference to class template instantiation 'std::chrono::duration<__int64,std::nano>' being compiled
1>V:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.20.27508\include\chrono(574): note: see reference to class template instantiation 'std::chrono::time_point<std::chrono::steady_clock,std::chrono::steady_clock::duration>' being compiled
1>V:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.20.27508\include\thread(35): error C2893: Failed to specialize function template 'unknown-type std::invoke(_Callable &&,_Types &&...) noexcept(<expr>)'
1>V:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.20.27508\include\thread(35): note: With the following template arguments:
1>V:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.20.27508\include\thread(35): note: '_Callable=void (__thiscall Tes32::GraphicsDevice::GraphicsController::* )(void)'
1>V:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.20.27508\include\thread(35): note: '_Types={Tes32::GraphicsDevice::GraphicsController (__cdecl *)(void)}'
1>GraphicsController.cpp
1>Generating Code...
1>Done building project "WolfOS_2_HDD.vcxproj" -- FAILED.
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
我正在使用Visual Studio Community2019。在此先感谢!
最佳答案
一个更简单的示例是:
#include <thread>
struct GraphicsController
{
void RenderThread()
{
}
};
int main()
{
GraphicsController g_ctx();
std::thread g_ctx_renderloop(&GraphicsController::RenderThread, g_ctx);
}
您代码中的问题是most vexing parse。
GraphicsController g_ctx();声明一个返回GraphicsController而不是GraphicsController对象的函数。要修复它，只需除去括号:int main()
{
GraphicsController g_ctx;
std::thread g_ctx_renderloop(&GraphicsController::RenderThread, g_ctx);
}
编译器错误输出的关键部分是最后两行:
_Callable=void (__cdecl GraphicsController::* )(void)
_Types={GraphicsController (__cdecl *)(void)}
这些告诉您正在使用的模板类型，
_Callable是第一个参数，可以作为GraphicsController类中的方法指针正确使用。 _Types是函数参数的列表，它应该只是{GraphicsController*}，但实际上是指向没有返回GraphicsController的参数的函数的函数指针。关于c++ - 线程时为C2893和C2672，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/60422129/