请给出修改后的具体代码
时间: 2024-03-24 22:36:52 浏览: 12
以下是修改后的代码,其中将 pipeRead 设置为 NULL,同时在使用前判断是否为 NULL:
```
#include <Windows.h>
#include <mutex>
#include <condition_variable>
#include <opencv2/opencv.hpp>
using namespace std;
using namespace cv;
string camera_path = "0";
string rtmpUrl = "rtmp://server/live/streamName";
Mat frame;
CRITICAL_SECTION mtx;
CONDITION_VARIABLE cond;
PROCESS_INFORMATION pi;
DWORD WINAPI capture_func(LPVOID args) {
VideoCapture cap(camera_path);
while (true) {
cap.read(frame);
EnterCriticalSection(&mtx);
InitializeConditionVariable(&cond);
WakeConditionVariable(&cond);
LeaveCriticalSection(&mtx);
}
}
DWORD WINAPI push_func(LPVOID args) {
HANDLE pipeRead = NULL, pipeWrite;
CreatePipe(&pipeRead, &pipeWrite, NULL, 0);
if (pipeRead == NULL) {
cout << "Failed to create anonymous pipe. Error: " << GetLastError() << endl;
return 1;
}
EnterCriticalSection(&mtx);
InitializeConditionVariable(&cond);
STARTUPINFO si;
si.cb = sizeof(si);
si.dwFlags = STARTF_USESTDHANDLES;
HANDLE tmp = pipeRead;
si.hStdInput = tmp;
wchar_t cmd[4096];
mbstowcs(cmd, "ffmpeg -f rawvideo -vcodec rawvideo -pix_fmt bgr24 -s 640x480 -r 30 -i pipe:0 -c:v libx264 -preset ultrafast -f flv rtmp://server/live/streamName", strlen("ffmpeg -f rawvideo ... ") + 1);
CreateProcess(NULL, cmd, NULL, NULL, TRUE, 0, NULL, NULL, &si, &pi);
CloseHandle(si.hStdInput);
while (true) {
SleepConditionVariableCS(&cond, &mtx, INFINITE);
DWORD dwWritten;
if (!WriteFile(pipeWrite, frame.data, frame.total() * frame.elemSize(), &dwWritten, NULL)) {
cout << "Failed to write to pipe. Error: " << GetLastError() << endl;
}
}
LeaveCriticalSection(&mtx);
CloseHandle(pipeWrite);
}
int main() {
InitializeCriticalSection(&mtx);
EnterCriticalSection(&mtx);
InitializeConditionVariable(&cond);
LeaveCriticalSection(&mtx);
HANDLE capture_thread = CreateThread(NULL, 0, capture_func, NULL, 0, NULL);
HANDLE pipeRead = NULL, pipeWrite;
CreatePipe(&pipeRead, &pipeWrite, NULL, 0);
if (pipeRead == NULL) {
cout << "Failed to create anonymous pipe. Error: " << GetLastError() << endl;
return 1;
}
CloseHandle(pipeRead);
CloseHandle(pipeWrite);
WaitForSingleObject(pi.hProcess, INFINITE);
}
```