Optimization information printing

Author: wysaid

examples/desktop/0-print_camera_c.c

@@ -17,9 +17,9 @@ bool frame_callback(const CcapVideoFrame* frame, void* userData) {
 
     CcapVideoFrameInfo frameInfo;
     if (ccap_video_frame_get_info(frame, &frameInfo)) {
-        printf("Frame %d: %dx%d, format=%d, timestamp=%d\n",
+        printf("Frame %d: %dx%d, format=%d, timestamp=%llu\n",
                frameCount, frameInfo.width, frameInfo.height,
-               frameInfo.pixelFormat, (int)frameInfo.timestamp);
+               frameInfo.pixelFormat, frameInfo.timestamp);
     }
 
     // Return false to keep the frame available for grab()
@@ -71,14 +71,17 @@ int main() {
     // Get device info
     CcapDeviceInfo deviceInfo;
     if (ccap_provider_get_device_info(provider, &deviceInfo)) {
-        printf("Device: %s\n", deviceInfo.deviceName ? deviceInfo.deviceName : "Unknown");
+        printf("Device: %s\n", deviceInfo.deviceName[0] ? deviceInfo.deviceName : "Unknown");
         printf("Supported pixel formats: %zu\n", deviceInfo.pixelFormatCount);
         printf("Supported resolutions: %zu\n", deviceInfo.resolutionCount);
 
         if (deviceInfo.resolutionCount > 0) {
-            printf("First resolution: %dx%d\n",
-                   deviceInfo.supportedResolutions[0].width,
-                   deviceInfo.supportedResolutions[0].height);
+            printf("Supported resolutions:\n");
+            for (size_t i = 0; i < deviceInfo.resolutionCount; i++) {
+                printf("  %zu: %dx%d\n", i + 1,
+                       deviceInfo.supportedResolutions[i].width,
+                       deviceInfo.supportedResolutions[i].height);
+            }
         }
     }
 
@@ -127,4 +130,4 @@ int main() {
 
     printf("Example completed successfully\n");
     return 0;
-}
+}

include/ccap_def.h

@@ -279,7 +279,7 @@ using ErrorCallback = std::function<void(ErrorCode errorCode, const std::string&
  * @param errorCode The error code to convert
  * @return English description of the error
  */
-std::string errorCodeToString(ErrorCode errorCode);
+std::string_view errorCodeToString(ErrorCode errorCode);
 
 /**
  * @brief Interface for memory allocation, primarily used to allocate the `data` field in `ccap::Frame`.

src/ccap_c.cpp

@@ -394,9 +394,8 @@ bool ccap_set_error_callback(CcapErrorCallback callback, void* userData) {
 
 const char* ccap_error_code_to_string(CcapErrorCode errorCode) {
     ccap::ErrorCode cppErrorCode = static_cast<ccap::ErrorCode>(static_cast<uint32_t>(errorCode));
-    static thread_local std::string errorString;
-    errorString = ccap::errorCodeToString(cppErrorCode);
-    return errorString.c_str();
+    std::string_view result = ccap::errorCodeToString(cppErrorCode);
+    return result.data(); // std::string_view::data() returns const char*, safe for string literals
 }
 
 const char* ccap_get_version(void) {

src/ccap_utils.cpp

@@ -247,7 +247,7 @@ void setLogLevel(LogLevel level) {
 #endif
 }
 
-std::string errorCodeToString(ErrorCode errorCode) {
+std::string_view errorCodeToString(ErrorCode errorCode) {
     switch (errorCode) {
     case ErrorCode::None:
         return "No error";